Dmitri ordered six amplifiers for a metro build. All were C-band, specified for a 40-channel configuration, and listed as boosters.<\/p>\n\n\n\n
Two had 17 dB of gain and a listed \u201csaturated optical power\u201d value of +3 dBm. The other four had 25 dB of gain and a listed value of \u22125 dBm. The listings stated maximum output power separately, so these saturation figures should not be described as saturated output power unless the manufacturer explicitly defines them that way.<\/p>\n\n\n\n
They did not behave as Dmitri expected. Under the actual input conditions, the high-gain units reached their saturation limit, while the lower-gain units could not provide the required gain at positions with weaker input signals.<\/p>\n\n\n\n
The name on the box told him the intended role, but not the full operating envelope. The real risk in DWDM amplifier selection is assuming that a role label makes products interchangeable without checking gain, input range, output power, and saturation specifications.<\/p>\n\n\n\n
Here is what the three roles actually mean, which four specs help determine the choice, and the selection order that avoids Dmitri\u2019s mistake. If you know your span loss and channel count, send both to FiberMall\u2019s optical engineers, and we\u2019ll help size the DWDM amplifier against your link budget.<\/p>\n\n\n\n