Patent ID: 7813647

Claim:
A chromatic dispersion compensation control method compensating for a chromatic dispersion of an optical transmission path with a variable dispersion compensator inserted in the optical transmission path, the chromatic dispersion compensation control method comprising: a transmitter inserting a fixed data sequence in a rewritable area of a transmission data sequence to be transmitted and transmitting the transmission data sequence to the optical transmission path, the fixed data sequence containing alternating 0-1 data formed of alternating 0s and 1s and alternating 0 series-1 series data formed of alternating series of 0s and 1s; and a receiver determining a direction to increase or decrease a dispersion compensation of the variable dispersion compensator based on a number of error occurrences in the alternating 0-1 data of the fixed data sequence and a number of error occurrences in the alternating 0 series-1 series data of the fixed data sequence, and variably controlling the dispersion compensation of the variable dispersion compensator in accordance with the determined direction.