Patent ID: 6275315
Filing Date: 2001-08-14
Classification: H04B

Abstract:
An apparatus for compensating for dispersion of an optical fiber in an optical line comprising:a dispersion compensation fiber for compensating dispersion of an optical signal produced by an optical transmitter to a first dispersion value, in order to predict and compensate for dispersion generated in an optical line;a dispersion compensation filter for controlling the dispersion value of the optical signal, after dispersion compensation by the dispersion compensation fiber, to obtain zero overall dispersion;an optical amplifier for amplifying a signal having a dispersion value adjusted by the dispersion compensation filter and outputting an amplified signal to the optical lines;a circulator for receiving the optical signal after dispersion compensation by the dispersion compensation fiber and outputting the optical signal received to the dispersion compensation filter, receiving the optical signal having a dispersion value adjusted by the dispersion compensation filter, and outputting the signal having the dispersion value adjusted by the dispersion compensation filter to the optical amplifier;a photodetector for detecting and converting the optical signal having the dispersion value adjusted by the dispersion compensation filter into an electrical signal; anda tracking unit for receiving the electrical signal from the photodetector and, in response, adjusting the dispersion value of the dispersion compensation filter.