OPTICAL TRANSMISSION SYSTEM FOR DYNAMICALLY COMPENSATING TRANSMITTED POWER

摘要

PROBLEM TO BE SOLVED: To provide an optical transmission system which is reliable and is not so complicated by providing a local oscillator discharging the auxiliary compensation wave of a wavelength with the gain bands of the respective optical fiber amplifiers of lines for a gain stabilization amplifier. SOLUTION: The system is provided with the gain stabilization optical amplifier OA arranged after (or after respective route designation nodes when a transmitter T is a route designation mode) the transmitter T. The gain a stabilization amplifier OA is selected to generate the local oscillation of wavelength λloc different from the wavelengths λ1-λn of a transmission channel. The gain stabilization optical amplifier OA is an amplifier where feedback is generated so that a laser cavity is established around an amplification medium and oscillation is executed in the cavity. When oscillation is executed in the cavity, the operation of a laser oscillator is executed. The laser oscillator operates in such a way that the gain of the cavity becomes constant when a value is not more than the threshold of a laser.