Patent ID: 8086109
Filing Date: 2011-12-27
Classification: H04B,H04J

Abstract:
1. A polarization multiplexed optical transmitting and receiving apparatus comprising; a transmission unit that generates polarization multiplexed light including first and second optical signals with polarization states orthogonal to each other, and transmits the polarization multiplexed light to an optical transmission line, and a reception unit that receives the polarization multiplexed light transmitted through the optical transmission line, wherein, the reception unit includes: a reception section that receives the polarization multiplexed light transmitted through the optical transmission line, and performs demodulation processing of the received light; a transmission-characteristic information monitoring section that monitors transmission characteristic information of the polarization multiplexed light obtained in a process of the demodulation processing in the reception section; and a transmission-characteristic information transfer section that transmits the transmission characteristic information monitored by the transmission-characteristic information monitoring section to the transmission unit, and the transmission unit includes: a light source section; a polarization separating section that separates an output light of the light source section into two lights with the polarization states orthogonal to each other; a first modulation section that modulates one of the lights separated by the polarization separating section, and generates the first optical signal; a second modulation section that modulates the other light separated by the polarization separating section, and generates the second optical signal; a polarization synthesizing section that synthesizes the first and second optical signals respectively output from the first and second modulation sections, and transmits the polarization multiplexed light to the optical transmission line; an adjustment section that variably adjusts a relative pulse timing between the first and second optical signals respectively output from the first and second modulation sections; and a control section that controls an adjustment amount in the adjustment section so that the transmission characteristics of the polarization multiplexed light are within a pre-set allowable range, based on the transmission characteristic information transmitted from the transmission-characteristic information transfer section.