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).

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