Patent ID: 9537570
Date: 2017-01-03
CPC Classifications: H04B,H04J

Claim:
1. An optical transmission system comprising: an optical transmitting device performing polarization multiplexing on and transmitting as polarization multiplexed signal light, a first signal light of a predetermined polarization direction and a second signal light of a polarization direction different from the predetermined polarization direction; an optical receiving device receiving the signal light transmitted from the optical transmitting device through an optical transmission path; an acquiring unit acquiring information indicative of a ratio of intensity between the first signal light and the second signal light included in the signal light received by the optical receiving device; and a control unit controlling the ratio of intensity between the first signal light and the second signal light included in the signal light output from the optical transmitting device such that a product of the ratio of intensity between the first signal light and the second signal light included in the signal light output and the ratio of intensity indicated by the information acquired by the acquiring unit comes close to a constant value, wherein the first signal light is an X-polarized wave and the second signal light is a Y-polarized wave, and the control unit changes the intensity of the X-polarized wave by an intensity manipulation amount X represented by the following equation: where TXout Psig x pola is the intensity of the X-polarized wave transmitted from the optical transmitting device; TXout Psig y pola is the intensity of the Y-polarized wave transmitted from the optical transmitting device; RXin Psig x pola is the intensity of the X-polarized wave received by the optical receiving device; and RXin Psig y pola is the intensity of the Y-polarized wave received by the optical receiving device.