POLARIZATION MULTIPLEX OPTICAL SIGNAL TRANSMISSION SYSTEM

• Main Authors: KAMEI ARATA, HONDA KENTARO, ONO SHIGERU, KISAKA YOSHIAKI, KAWAKAMI HIROTO, SAIDA TAKASHI, YONENAGA KAZUSHIGE
• Format: Patent
• Language: English; Japanese
• Published: 27.06.2019
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; MULTIPLEX COMMUNICATION; TRANSMISSION

To provide a technique capable of estimating a PDL cased by transmission of an optical signal using a multiple optical transmission system at high precisely with a simple structure.SOLUTION: A polarization multiplex optical signal transmission system comprises: a dither signal superposition part having the same frequency and amplitude, and making first and second dither signals each of which a phase is adjusted so that an intensity of the other optical signal becomes the minimum value when the intensity of one optical signal of a first optical signal and a second optical signal each of which a polarization orthogonally multiplexed to be superposed to first and second optical signals becomes the largest value; a dither signal detection part detecting a total sum of the first dither signal superposed to the first optical signal and the second dither signal superposed to the second optical signal; and a PDL estimation part estimating a PDL caused by one part or a whole of a system on the basis of the total sum of the dither signals detected.SELECTED DRAWING: Figure 1 【課題】偏波多重光伝送方式を用いた光信号の伝送において生じうるＰＤＬを、より簡易な構成でＰＤＬを精度良く推定することができる技術を提供すること。【解決手段】実施形態の偏波多重光信号伝送システムは、同じ周波数及び振幅を有し、互いに偏波が直交するように多重化される第１の光信号及び第２の光信号のうち一方の光信号の強度が最大値をとるときに他方の光信号の強度が最小値となるように位相を調整した第１及び第２のディザ信号を第１及び第２の光信号に重畳させるディザ信号重畳部と、第１の光信号に重畳された第１のディザ信号と、第２の光信号に重畳された第２のディザ信号との和を検出するディザ信号検出部と、検出された前記ディザ信号の和に基づいてシステムの一部又は全部に起因するＰＤＬを推定するＰＤＬ推定部と、を備える。【選択図】図１