OPTICAL AUTOMATIC EQUALIZER

摘要

PROBLEM TO BE SOLVED: To obtain a preset dispersion equalizing function and an adaptive dispersion equalizing function and to correct both the timing jitter and intensity fluctuations of a signal at the same time. SOLUTION: This equalizer comprises the two functions of a dispersion equalization part 1 and a waveform shaping part 4. The dispersion equalizer 1 is composed of a rough operation part 2 which selects dispersed media and roughly equalizes dispersion and a fine operation part 3 which performs fine dispersion equalization by controlling a variable dispersion equalizer having two kinds of chirp fiber gratings combined. The waveform shaping part 4 is composed of a timing jitter correction part 5 which makes the pulse width narrow by optical modulation synchronized with a clock signal and reduces timing jitter and an intensity fluctuation correction part 6 which amplifies signal light to large power by a basic soliton, inputs it to a dispersed medium with high nonlinearity to convert intensity fluctuations into spectrum extent fluctuations, and outputs the signal light having the intensity fluctuations of the signal light removed through an optical band-pass filter.