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What is 200G QSFP-DD Optical Transceiver?
QSFP-DD is forward and backward compatible with the QSFP port and is also compatible with the existing QSFP28 optical modules and AOC/DAC, etc. With NRZ modulation technology, the data rate can be achieved for 200G( 25Gx8 channels) network transmission. Meanwhile, with PAM4 modulation technology, the data rate can reach 400G( 50Gx4 channels) network transmission for high-performance computing data centers and cloud networks. With fully considered the using flexibility for users, the MSA group adopted ASIC design, made the QSFP-DD supports multiple interface rates so as to reduce port cost and equipment deployment cost.
Currently, there are two main types of 200G optical modules: 200G QSFP56 and 200G QSFP-DD. The QSFP56 (Quad 50 Gigabits Small Form-factor Pluggable) is designed specifically for 200G Ethernet. QSFP56 denotes 4 x 50 to 56Gb/s in a QSFP form factor. In a nutshell, QSFP-DD module is a high-speed, small pluggable and low-power transceiver. The QSFP-DD modules can support 400Gbps, while the QSFP56 can only reach 200Gbps.
· 200G QSFP-DD LR4
200G QSFP-DD LR4 converts the 8-channel of 25Gb/s or 4-channel of 50Gb/s electrical input data into LWDM optical signals. It contains a duplex LC connector for the optical interface and a 76-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be applied in this module. Host FEC is required to support up to 10km fiber transmission.
· 200G QSFP-DD ER4
The module incorporates 4 independent channels on LWDM4 1295.56, 1300.05, 1304.58 and 1309.14nm center wavelength, operating at 50G per channel. It contains a duplex LC connector for the optical interface and a 76-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be applied in this module. It can support up to 30km with 200G FEC and 40km with built-in PFEC. Unlike NRZ, 4x50Gbps PAM4 technology for 200G transmission does not require the use of eight 25G channels for 200G transmission, which saves fiber cost and reduces link loss.
Compare to 200G QSFP-DD, the 400G QSFP-DD has more types and choices, such as 400G QSFP-DD SR8/DR4/FR4,etc. Fiber Mall can provide you with 200G&400G transceivers of excellent quality and service.