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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