{"id":1842,"date":"2022-04-20T09:04:47","date_gmt":"2022-04-20T09:04:47","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=1842"},"modified":"2023-05-16T03:35:49","modified_gmt":"2023-05-16T03:35:49","slug":"dwdm-technology-its-development-and-application","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm","title":{"rendered":"DWDM Technology: Its Development and Application"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Basics_Introduction_of_DWDM\" >Basics Introduction of DWDM<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#The_Structure_of_the_DWDM_Unit\" >The Structure of the DWDM Unit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#The_Working_principle_of_the_DWDM_system\" >The Working principle of the DWDM system<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Classification_of_DWDM_Systems\" >Classification of DWDM Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Integrated_DWDM_system\" >Integrated DWDM system<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Key_Components_of_DWDM\" >Key Components of DWDM<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Types_of_network\" >Types of network<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Advantages_of_DWDM_Technology\" >Advantages of DWDM Technology<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Discussion_on_DWDM_Technology\" >Discussion on DWDM Technology<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Network_Analysis_of_DWDM\" >Network Analysis of DWDM<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#DWDM_Optical_Module_Realizes_Low-Cost_Expansion_of_Fiber_Capacity\" >DWDM Optical Module Realizes Low-Cost Expansion of Fiber Capacity<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#About_Wavelength_Division_Multiplexing_DWDM\" >About Wavelength Division Multiplexing\u00a0(DWDM)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#DWDM_Optical_Transceiver_Module\" >DWDM Optical Transceiver Module<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Two_Application_Solutions_for_DWDM_Optical_Transceiver_Modules\" >Two Application Solutions for DWDM Optical Transceiver Modules<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.fibermall.com\/blog\/dwdm-technology-fiber.htm\/#Related_Posts\" >Related Posts<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Basics_Introduction_of_DWDM\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Basics Introduction of DWDM<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Wavelength Division Multiplexing WDM is a technology that multiplexes optical signals of different wavelengths into a single fiber for transmission.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/WDM.png\" alt=\"WDM\" width=\"800\" height=\"171\" \/><\/span><\/p>\n<ul>\n<li><span style=\"font-family: 'times new roman', times, serif;\">CWDM (Coarse Wavelength Division Multiplexing) uses wide wavelength spacing, usually 20nm apart.<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">DWDM (Dense Wavelength Division Multiplexing) uses narrow wavelength spacing, typically between 0.8-2nm.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Now, we will focus on introducing the Dense Wavelength Division Multiplexing (DWDM) technology in WDM.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">DWDM combines optical carriers on a single fiber for transmission, increasing the transmission capacity of each fiber. DWDM can carry SDH services, IP services, and ATM services.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/DWDM-combines-optical-carriers-on-a-single-fiber-for-transmission.png\" alt=\"DWDM combines optical carriers on a single fiber for transmission\" width=\"800\" height=\"348\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The ITU International Telecommunication Union standard for DWDM wavelengths is 1528.77nm-1563.86nm, mainly in the C-band with low attenuation and dispersion. \u00a0100GHz (0.8nm) wavelength spacing can have 40 channels, 50GHz (0.4nm) wavelength spacing can have 80 channels.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_Structure_of_the_DWDM_Unit\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>The Structure of the DWDM Unit <\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Dense Wavelength Division Multiplexing (DWDM) is a relatively advanced optical fiber communication technology at present. With the development of the economy and technology, people\u2019s demand for data transmission speed has also increased to a relatively high level, resulting in a bright prospect of DWDM technology.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/The-structure-of-DWDM.png\" alt=\"The structure of DWDM\" width=\"800\" height=\"294\" \/><\/span><\/p>\n<ul>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Optical transponder: Converts wavelength light signals;<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Optical multiplexer and splitter: Combines and splits fixed wavelength light signals;<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Optical amplifier (OLA): located in the middle of the optical transmission section, the OLA amplifies the optical signal;<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Optical supervisory channel: used to carry the management and monitoring of DWDM system, so that the network management system can effectively manage the DWDM system.<\/span><\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"The_Working_principle_of_the_DWDM_system\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>The Working principle of the DWDM system<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Dual-fiber unidirectional transmission<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">A unidirectional WDM system uses two optical fibers. One fiber only completes the transmission of optical signals in one direction, and the transmission of reverse optical signals is completed by the other fiber.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Dual-fiber-unidirectional-transmission.png\" alt=\"Dual-fiber unidirectional transmission\" width=\"800\" height=\"332\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Advantages:\u00a0Each signal is carried by a different wavelength, ensuring that there is no interference, and the same wavelength can be reused in both directions.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Disadvantages:\u00a0Low utilization of fiber and optical device resources.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Single-fiber bidirectional transmission<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">A bi-directional wavelength division multiplexing (WDM) system uses a single fiber to transmit signals in both directions, with different wavelengths carrying the signals in each direction, achieving full-duplex communication.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Single-fiber-bidirectional-transmission.png\" alt=\"Single-fiber bidirectional transmission\" width=\"800\" height=\"326\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Advantages:\u00a0can reduce the number of fibers and line amplifiers used, saving costs.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Disadvantages:\u00a0high requirements, need to solve the multi-channel interference, extended transmission distance requires optical amplification.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Classification_of_DWDM_Systems\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Classification of DWDM Systems<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Open DWDM system<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Open-DWDM-system.png\" alt=\"Open DWDM system\" width=\"800\" height=\"255\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">In the transmission end, OTU is used to convert non-standard wavelengths into standard wavelengths. The main function of this device is to convert non-standard wavelengths into standard wavelengths specified by ITU-T to meet the wavelength compatibility of the system.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Integrated_DWDM_system\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Integrated DWDM system<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Integrated-DWDM-system.png\" alt=\"Integrated DWDM system\" width=\"800\" height=\"251\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The service signal itself already meets the standard wavelength, and no OTU is needed at the transceiver and transmitter.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Key_Components_of_DWDM\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Key Components of DWDM<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Light source:<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The function of the light source is to generate laser or fluorescence, which is an important device in fiber optic communication systems.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The light source of DWDM system has a relatively large dispersion tolerance and standard and stable wavelength.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">There are two modulation methods for lasers: direct modulation and indirect modulation.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Photodetector:<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The role of the photodetector is to convert the received optical signal into a corresponding electrical signal.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">As the optical signal transmitted over the fiber is generally very weak, high requirements are placed on the photodetector.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Optical amplifier:<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The optical amplifier is used to enhance the optical signal and mainly includes Erbium Doped Fiber Amplifier (EDFA) and Raman fiber amplifier.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Optical-amplifier.png\" alt=\"Optical amplifier\" width=\"800\" height=\"169\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Optical multiplexer and optical demultiplexer:<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The core components of WDM system are wavelength division multiplexer, i.e. optical multiplexer and optical demultiplexer, which are actually optical filters. Their characteristics largely determine the performance of the whole system, and the requirements are sufficient number of multiplexing channels, small insertion loss, wide passband range, etc.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Optical-multiplexer-and-optical-demultiplexer.png\" alt=\"Optical multiplexer and optical demultiplexer\" width=\"800\" height=\"220\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">There are many types of optical wavelength division multiplexers, which can be roughly divided into four categories: interference filter type, fiber coupler type, grating type, and array waveguide grating type.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/types-of-optical-wavelength-division-multiplexers.png\" alt=\"types of optical wavelength division multiplexers\" width=\"800\" height=\"230\" \/><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Types_of_network\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Types of network<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Point-to-point Network<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Point-to-point-Network.png\" alt=\"Point-to-point Network\" width=\"800\" height=\"62\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Mesh\u00a0Network<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Mesh-Network.png\" alt=\"Mesh Network\" width=\"800\" height=\"242\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Ring Network<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Ring-Network.png\" alt=\"Ring Network\" width=\"800\" height=\"425\" \/><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Advantages_of_DWDM_Technology\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Advantages of DWDM Technology<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Ultra-large capacity: Because DWDM technology makes full use of fiber bandwidth resources, multiplexing dozens or even hundreds of channels in a single fiber, the capacity of a single fiber is greatly improved.<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">&#8220;Transparent&#8221; transmission of data: The DWDM system is transparent to &#8220;data&#8221; and is independent of signal rate and electrical modulation method. Therefore, multiple business signals with completely different rates, formats, and characteristics can be transmitted simultaneously.<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Convenient and flexible system upgrade and expansion: New services can be introduced by adding wavelengths without interrupting existing services, maximizing the protection of existing investments.<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Economical and reliable networking: The new communication network constructed using <a href=\"https:\/\/www.fibermall.com\/store-17103-dwdm-mux-demux-fiber.htm\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\">DWDM<\/span><\/a> technology is much simpler than the network composed of traditional electrical time-division multiplexing technology, and the network hierarchy is clear. Due to the simplified network structure, clear hierarchy, and convenient business scheduling, the economy and reliability of the network are obvious.<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Form an all-optical network: DWDM technology will be one of the key technologies for achieving an all-optical network, and DWDM systems can be compatible with future all-optical networks. In the future, it may be possible to achieve a transparent and highly survivable all-optical network based on the already-built DWDM network.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/comparsion-of-dwdm-and-cwdm.png\" alt=\"comparsion of dwdm and cwdm\" width=\"800\" height=\"446\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">DWDM and CWDM technology are two different products of wavelength division multiplexing technology, and each has advantages in different network layers.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Due to its low cost and simple structure, CWDM technology has good application prospects in the access layer of metropolitan area networks with its multi-service features. DWDM technology, on the other hand, is preferred for backbone networks, core metropolitan area networks, and local network backbone transmission equipment due to its high capacity and long-distance transmission characteristics.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">When choosing CWDM\/DWDM solution, the best solution should be selected by considering the project requirements and budget and also combining their characteristics and differences.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Discussion_on_DWDM_Technology\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Discussion on DWDM Technology<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-family: 'times new roman', times, serif;\">DWDM belongs to the wavelength-division multiplexing (WDM) technology, which is a mature technology that has been widely used in the field of optical fiber communication transmission. WDM utilizes the transmission characteristics of light waves to press together light waves of different wavelengths and frequencies through an optical multiplexing system so that data can be transmitted through a single optical fiber. The schematic diagram of its system structure is shown in figure.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/\u56fe\u4e00-300x158.png\" alt=\"Propagation diagram of the wdm technology\" width=\"568\" height=\"299\" \/><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-family: 'times new roman', times, serif;\"><strong><span style=\"font-size: 10pt;\">Propagation diagram of the WDM technology<\/span><\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The optical wave multiplexer and the optical wave demultiplexer are the core of the entire WDM system. At present, the two functions of wave multiplexer and demultiplexing can be integrated into one machine, which is regarded as an optical multiplexing system, similar to the modem that can perform both modulation and demodulation functions in the early copper transmission system. With the development of science and technology, the sensitivity of the optical multiplexing system-related machines has been improved, and it has been able to perform multiplexing and demultiplexing operations on optical signals with very similar wavelengths and frequencies, which lays a solid foundation for the wide application of DWDM technology.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">\n<table id=\"tablepress-59\" class=\"tablepress tablepress-id-59\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Channel<\/th><th class=\"column-2\">Center Frequency(THz)<\/th><th class=\"column-3\">Wavelength(nm)<\/th><th class=\"column-4\">Channel<\/th><th class=\"column-5\">Center Frequency(THz)<\/th><th class=\"column-6\">Wavelength(nm)<\/th><th class=\"column-7\">Channel<\/th><th class=\"column-8\">Center Frequency(THz)<\/th><th class=\"column-9\">Wavelength(nm)<\/th><th class=\"column-10\">Channel<\/th><th class=\"column-11\">Center Frequency(THz)<\/th><th class=\"column-12\">Wavelength(nm)<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">C21<\/td><td class=\"column-2\">192.1<\/td><td class=\"column-3\">1560.61<\/td><td class=\"column-4\">C31<\/td><td class=\"column-5\">193.1<\/td><td class=\"column-6\">1552.52<\/td><td class=\"column-7\">C41<\/td><td class=\"column-8\">194.1<\/td><td class=\"column-9\">1544.53<\/td><td class=\"column-10\">C51<\/td><td class=\"column-11\">195.1<\/td><td class=\"column-12\">1536.61<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">C22<\/td><td class=\"column-2\">192.2<\/td><td class=\"column-3\">1559.79<\/td><td class=\"column-4\">C32<\/td><td class=\"column-5\">193.2<\/td><td class=\"column-6\">1551.72<\/td><td class=\"column-7\">C42<\/td><td class=\"column-8\">194.2<\/td><td class=\"column-9\">1543.73<\/td><td class=\"column-10\">C52<\/td><td class=\"column-11\">195.2<\/td><td class=\"column-12\">1535.82<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">C23<\/td><td class=\"column-2\">192.3<\/td><td class=\"column-3\">1558.98<\/td><td class=\"column-4\">C33<\/td><td class=\"column-5\">193.3<\/td><td class=\"column-6\">1550.92<\/td><td class=\"column-7\">C43<\/td><td class=\"column-8\">194.3<\/td><td class=\"column-9\">1542.94<\/td><td class=\"column-10\">C53<\/td><td class=\"column-11\">195.3<\/td><td class=\"column-12\">1535.04<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">C24<\/td><td class=\"column-2\">192.4<\/td><td class=\"column-3\">1558.17<\/td><td class=\"column-4\">C34<\/td><td class=\"column-5\">193.4<\/td><td class=\"column-6\">1550.12<\/td><td class=\"column-7\">C44<\/td><td class=\"column-8\">194.4<\/td><td class=\"column-9\">1542.14<\/td><td class=\"column-10\">C54<\/td><td class=\"column-11\">195.4<\/td><td class=\"column-12\">1534.25<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">C25<\/td><td class=\"column-2\">192.5<\/td><td class=\"column-3\">1557.36<\/td><td class=\"column-4\">C35<\/td><td class=\"column-5\">193.5<\/td><td class=\"column-6\">1549.32<\/td><td class=\"column-7\">C45<\/td><td class=\"column-8\">194.5<\/td><td class=\"column-9\">1541.35<\/td><td class=\"column-10\">C55<\/td><td class=\"column-11\">195.5<\/td><td class=\"column-12\">1533.47<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">C26<\/td><td class=\"column-2\">192.6<\/td><td class=\"column-3\">1556.55<\/td><td class=\"column-4\">C36<\/td><td class=\"column-5\">193.6<\/td><td class=\"column-6\">1548.51<\/td><td class=\"column-7\">C46<\/td><td class=\"column-8\">194.6<\/td><td class=\"column-9\">1540.56<\/td><td class=\"column-10\">C56<\/td><td class=\"column-11\">195.6<\/td><td class=\"column-12\">1532.68<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">C27<\/td><td class=\"column-2\">192.7<\/td><td class=\"column-3\">1555.75<\/td><td class=\"column-4\">C37<\/td><td class=\"column-5\">193.7<\/td><td class=\"column-6\">1547.72<\/td><td class=\"column-7\">C47<\/td><td class=\"column-8\">194.7<\/td><td class=\"column-9\">1539.77<\/td><td class=\"column-10\">C57<\/td><td class=\"column-11\">195.7<\/td><td class=\"column-12\">1531.9<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">C28<\/td><td class=\"column-2\">192.8<\/td><td class=\"column-3\">1554.94<\/td><td class=\"column-4\">C38<\/td><td class=\"column-5\">193.8<\/td><td class=\"column-6\">1546.92<\/td><td class=\"column-7\">C48<\/td><td class=\"column-8\">194.8<\/td><td class=\"column-9\">1538.98<\/td><td class=\"column-10\">C58<\/td><td class=\"column-11\">195.8<\/td><td class=\"column-12\">1531.12<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">C29<\/td><td class=\"column-2\">192.9<\/td><td class=\"column-3\">1554.13<\/td><td class=\"column-4\">C39<\/td><td class=\"column-5\">193.9<\/td><td class=\"column-6\">1546.12<\/td><td class=\"column-7\">C49<\/td><td class=\"column-8\">194.9<\/td><td class=\"column-9\">1538.19<\/td><td class=\"column-10\">C59<\/td><td class=\"column-11\">195.9<\/td><td class=\"column-12\">1530.33<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">C30<\/td><td class=\"column-2\">193<\/td><td class=\"column-3\">1553.33<\/td><td class=\"column-4\">C40<\/td><td class=\"column-5\">194<\/td><td class=\"column-6\">1545.32<\/td><td class=\"column-7\">C50<\/td><td class=\"column-8\">195<\/td><td class=\"column-9\">1537.4<\/td><td class=\"column-10\">C60<\/td><td class=\"column-11\">196<\/td><td class=\"column-12\">1529.56<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-59 from cache --><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-family: 'times new roman', times, serif;\"><strong><span style=\"font-size: 10pt;\">DWDM wavelength: wavelength allocation of 40-wave DWDM\u00a0100G<\/span><\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">In a DWDM system, a single optical cable can transmit multiple light waves of different wavelengths and frequencies, and these light waves propagate along different optical channels divided in the optical fiber, which makes the speed of the data that was originally 2.5GB\/s in an optical cable be increased many times. At present, the maximum data traffic that can be transmitted by a single fiber has reached 400Gb\/s. The DWDM system has incomparable advantages in the application.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">First, multiple optical signals are combined on one channel for transmission, which effectively improves the transmission efficiency of data. Secondly, this technology can effectively reduce costs, especially in the long-distance data transmission process using optical fibers as transmission carriers. Optical multiplexing technology, especially DWDM technology, can greatly save optical fibers and optical signal regeneration equipment, and at the same time the EDFA technology, external modulation, electro-absorption, and other technologies involved in transmission make the allowable loss and dispersion of the hops of the entire transmission system larger, effectively extending the transmission distance.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">At the same time, the DWDM system is equivalent to virtualizing multiple optical fiber channels in one optical fiber, so it has good compatibility for the transmission of various data, effectively improving the survivability of the entire optical fiber transmission system, and is also very convenient for expansion operations.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/\u56fe2-\u82f1\u6587\u7248-300x156.png\" alt=\"dwdm system\" width=\"571\" height=\"297\" \/><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-family: 'times new roman', times, serif; font-size: 10pt;\">theoretical system diagram of the DWDM technology<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Network_Analysis_of_DWDM\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Network Analysis of DWDM<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Optical fiber\u2019s own characteristics determine that it is difficult to correct after the laying of the optical fiber network is completed. The DWDM network involves various technologies, so it should be treated with more caution in the design process.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The overall structure of the <a href=\"https:\/\/www.fibermall.com\/store-17089-optical-transport-network.htm\" target=\"_blank\">DWDM system<\/a> with N wavelength multiplexing mainly includes the following:<\/span><\/p>\n<ul>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Optical transponder\u00a0unit (OTU);<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\">Wavelength division multiplexer:\u00a0Optical demultiplexer\/multiplexer (ODU\/OMU);<\/span><\/li>\n<li><span style=\"font-family: 'times new roman', times, serif;\"><a href=\"https:\/\/www.fibermall.com\/store-21953-edfa-optical-amplifier.htm\" target=\"_blank\">Optical amplifier<\/a> (BA\/LA\/PA);<\/span><\/li>\n<\/ul>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/\u56fe3-2-300x88.png\" alt=\"The structure of the DWDM system with N wavelength multiplexing \" width=\"667\" height=\"197\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The overall structure of the DWDM system with N wavelength multiplexing<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">The classification of DWDM networks is complicated with various classification criteria, including the way of carrying services, whether wavelength can be converted, whether there is photoelectric conversion in the transmission process, etc. The topological structure of the network must be considered during its construction and design.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Like the traditional data transmission network, the DWDM network is also divided into the mesh, ring, star, and bus networks in topological structure. In the current application environment, mesh and ring networking methods are more common. When determining the networking mode, the main factors that need to be considered include cost and network performance. Specifically, it should include the maximum point-to-point data volume that the network can transmit, network routing capabilities, network security, network autonomous resilience, etc.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">On the basis of the overall consideration of the above problems, the final form and related parameters of the network are determined according to the characteristics of different topological structures. It is generally recommended to adopt a unified design scheme to avoid splitting the entire design process into several stages, which can effectively maintain the consistency of the entire website planning and improve the comprehensive communication capability of the network.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Taking the mesh fiber network as an example, designers need to pay special attention to the environmental needs and take into account the changes in the entire demand environment in the future development process, and then estimate the corresponding parameters according to the needs, including the size of the OXC located at different nodes, the number of fibers, and the wavelength requirements among nodes. Due to the weak self-healing ability of the mesh topology, the problems that need to be determined in the design process are basically concentrated on the capacity of the network, especially when the associated road or node in the network fails, the transfer bearer problem related to data requirements is the main point to consider.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">In contrast, the self-healing capability of the ring network is slightly better, so more attention is paid to the design of the network level. Special attention should also be paid to the problem of segmenting and locating the ring network structure and function based on intra-ring routing and wavelength allocation. Different from the mesh fiber network, the ring network does not need to consider the allocation of idle network capacity, because the idle capacity itself is embedded in the ring network. After the network design process, optimization issues must also be considered for DWDM networks. This needs to optimize the configuration of each link according to the actual parameters in the network, and the process has been carried out until the entire network is laid.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">In an environment with a transmission rate of more than<a href=\"https:\/\/www.fibermall.com\/store-17017-10g-dwdm-sfp.htm\" target=\"_blank\"> 10Gb\/s<\/a>, problems such as signal distortion have a great impact on the quality of transmission, so the optimization of the network is crucial. In this process, the work includes the determination of the basic configuration during project bidding, the measurement of actual parameters during project execution, the adjustment of the DCM module and pump card, and the actual parameter settings of each specific segment according to the measurement results, and the adjustment of signal pre-emphasis, and many other aspects. Only by carefully implementing each link can we obtain high-quality signal transmission services.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"DWDM_Optical_Module_Realizes_Low-Cost_Expansion_of_Fiber_Capacity\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>DWDM Optical Module Realizes Low-Cost Expansion of Fiber Capacity<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-family: 'times new roman', times, serif;\">In traditional transmission modes, a single fiber can only transmit optical carrier signals carrying one type of information.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Ordinary dual-fiber optical module\u00a0(transmitting over 2-core fibers).<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Ordinary-dual-fiber-optical-module.png\" alt=\"Ordinary dual-fiber optical module\" width=\"800\" height=\"263\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">It can be replaced with a BIDI optical module (transmitting over a single-core fiber)\u00a0when additional services are needed but fiber resources are limited.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/BIDI-optical-module-transmitting-over-a-single-core-fiber.png\" alt=\"BIDI optical module (transmitting over a single-core fiber)\" width=\"800\" height=\"263\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">When the number of services continues to increase and BIDI is no longer sufficient, a WDM optical module (mainly DWDM) can be used, which is what we are introducing here\u2014DWDM SFP optical module and DWDM SFP+ optical module.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"About_Wavelength_Division_Multiplexing_DWDM\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>About Wavelength Division Multiplexing\u00a0(DWDM)<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\">DWDM wavelength division multiplexing is a WDM, which is the multiplexing of optical signals of different wavelengths into one fiber for transmission.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/DWDM-wavelength-division-multiplexing-is-a-WDM.png\" alt=\"DWDM wavelength division multiplexing is a WDM\" width=\"800\" height=\"338\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">In the traditional transmission mode, one fiber can only carry one kind of information optical carrier signal. In the case of different services, different fibers are required for transmission. DWDM wavelength division multiplexing technology can provide multiple virtual fiber channels on a single physical fiber.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/multiple-virtual-fiber-channels-on-a-single-physical-fiber.png\" alt=\"multiple virtual fiber channels on a single physical fiber\" width=\"800\" height=\"232\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">DWDM channels are more densely spaced and use C-band (1525nm-1565nm) and L-band (1570nm-1610nm) transmission windows, which are small segments taken out from inside the CWDM wavelength range. DWDM channel spacing is 0.4nm, 0.8nm, 1.6nm, etc. (CWDM band spacing is 20nm), which is smaller and requires additional wavelength control devices.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/CWDM-and-DWDM.png\" alt=\"CWDM and DWDM\" width=\"800\" height=\"603\" \/><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"DWDM_Optical_Transceiver_Module\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>DWDM Optical Transceiver Module<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\">DWDM optical modules, also known as colored light optical modules, are an important component in optical modules for converting optoelectronic signals. Similar to ordinary optical modules, DWDM optical modules need to be used with DWDM wavelength division multiplexers to multiplex optical signals of different wavelengths onto a single fiber for transmission. At the receiving end of the link, the mixed signal in the fiber is demultiplexed into different wavelength signals by an optical demultiplexer to achieve long-distance communication transmission.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/DWDM-Optical-Transceiver-Module.png\" alt=\"DWDM Optical Transceiver Module\" width=\"800\" height=\"1480\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Common package types for DWDM optical modules include SFP, SFP +, XFP, SFP28, QSFP +, and QSFP28, which have the advantages of high transmission capacity, small size, low power consumption, LC duplex interface, DDM (digital diagnostic function), etc.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Common DWDM optical modules include 1.25G SFP DWDM, 10G SFP+ DWDM, 10G XFP CWDM, <a href=\"https:\/\/www.fibermall.com\/sale-459587-25g-dwdm-sfp28-c27-20km.htm\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\">25G SFP28 DWDM<\/span><\/a>, 40G QSFP+ DWDM, and 100G QSFP28 DWDM. The common transmission distance of DWDM optical modules is 40km, and options for 80km and 120km are also available (multiple relay stations can be used to extend the transmission distance beyond 120km).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Two_Application_Solutions_for_DWDM_Optical_Transceiver_Modules\"><\/span><span style=\"font-family: 'times new roman', times, serif;\"><strong>Two Application Solutions for DWDM Optical Transceiver Modules<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Dual-fiber unidirectional DWDM transmission solution<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Dual-fiber unidirectional refers to the simultaneous transmission of all optical paths in the same direction on a single fiber. Different wavelengths carry different optical signals, which are multiplexed at the transmitting end and transmitted through a single fiber. At the receiving end, they are demultiplexed to complete the transmission of multiple optical signals, while the opposite direction is transmitted through another fiber. The two directions of transmission are completed by two separate fibers.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Dual-fiber-unidirectional-DWDM-transmission-solution.png\" alt=\"Dual-fiber unidirectional DWDM transmission solution\" width=\"800\" height=\"487\" \/><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><strong>Single-fiber bidirectional DWDM transmission solution<\/strong><\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\">Single-fiber bidirectional means that the optical signal adopts different wavelengths for sending and receiving on a single fiber to achieve bidirectional transmission of services.<\/span><\/p>\n<p><span style=\"font-family: 'times new roman', times, serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2022\/04\/Single-fiber-bidirectional-DWDM-transmission-solution.png\" alt=\"Single-fiber bidirectional DWDM transmission solution\" width=\"800\" height=\"487\" \/><\/span><\/p>\n<style>\r\n\r\n        .lwrp.link-whisper-related-posts{\r\n            \r\n            margin-top: 40px;\nmargin-bottom: 30px;\r\n        }\r\n        .lwrp .lwrp-title{\r\n            \r\n            \r\n        }\r\n        .lwrp .lwrp-description{\r\n            \r\n            \r\n\r\n        }\r\n        .lwrp .lwrp-list-container{\r\n        }\r\n        .lwrp .lwrp-list-multi-container{\r\n            display: flex;\r\n        }\r\n        .lwrp .lwrp-list-double{\r\n            width: 48%;\r\n        }\r\n        .lwrp .lwrp-list-triple{\r\n            width: 32%;\r\n        }\r\n        .lwrp .lwrp-list-row-container{\r\n            display: flex;\r\n            justify-content: space-between;\r\n        }\r\n        .lwrp 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