Position of the DCM module on an NE

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If only one OBU board is configured on the NE, the DCM/DCU must be placed between a VOA and the OBU on the line.
If only one OAU board is configured on the NE, the DCM/DCU must be placed between the TDC and RDC ports of the OAU board on the line.
If OAU+OBU or OPU+OBU are configured on the NE, the DCM/DCU must be placed between the two OA boards.

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Specifications and types of DCM optical modules
DCM optical modules are classified into multiple types, which correspond to compensation distances of 5 km, 10 km, 20 km, 40 km, 60 km, 80 km, 100 km, 120 km, 160 km, 200 km, and 240 km.

Working principles of DCM optical modules
After an optical signal is transmitted over a certain distance, the optical signal pulse is widened because of the positive dispersion accumulated during line transmission, seriously affecting the system transmission performance. Using the passive compensation method, a DCM uses the negative dispersion of optical fibers to offset the positive dispersion of transmission fibers and therefore compresses signal pulses. According to different implementation principles, DCMs are classified into two types: DCMs using dispersion compensation fibers (DCFs) and DCMs using fiber Bragg grating (FBG).

Working principle of a DCM
After an optical signal is transmitted over a specific distance, the optical signal pulse is widened because of the positive dispersion accumulated in the system. As a result, the system transmission performance is seriously affected. A DCM is a passive device using a dispersion compensation fiber (DCF). With a DCM, signal pulses are compressed because a DCM has inherent negative dispersion that can offset the positive dispersion of the transmission fiber. According to implementation principles, DCMs are classified into two types: DCMs using a DCF fiber and DCMs using fiber Bragg grating (FBG).

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