光変調器及び光変調方法

Light modulator and light modulation method

Abstract

PROBLEM TO BE SOLVED: To provide a light modulator for optical multi-level modulation that has a simple structure, is obtained at low cost, is easily controlled and has a small loss, and a light modulation method using the same.SOLUTION: A light modulator for converting an input electric signal into a multi-level optical signal, comprises: light branching means for branching incident signal light; at least two phase modulating means connected to an output side of the light branching means for modulating a phase of the signal light in accordance with the electric signal; light merging means for merging the branched signal light; and intensity adjusting means connected to all of the at least two phase modulating means or to one of the two phase modulating means for adjusting the signal light, which are guided from the at least two phase modulating means through the light merging means to an output side, have different intensities.
【課題】構成が簡単で低コスト、かつ制御が容易で低損失な光多値変調用の光変調器及び光変調方法を提供する。 【解決手段】入力された電気信号を多値光信号に変換する光変調器であって、入射された信号光を分岐させる光分岐手段と、前記光分岐手段の出力側に接続され、前記電気信号に応じて信号光の位相を変調する少なくとも2つの位相変調手段と、分岐された信号光を合流させる光合流手段と、少なくとも2つの前記位相変調手段の全て、又は少なくとも2つの前記位相変調手段の内の1つを除いた残りの前記位相変調手段に接続され、少なくとも2つの前記位相変調手段から前記光合流手段を経て出力側に導かれる信号光の強度がそれぞれ異なるように調整する強度調整手段とを備えた。 【選択図】図1

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Patent Citations (2)

    Publication numberPublication dateAssigneeTitle
    JP-2009145781-AJuly 02, 2009Fujitsu Ltd, 富士通株式会社光導波路素子およびそれを用いた光学装置
    JP-2009244682-AOctober 22, 2009Fujitsu Ltd, 富士通株式会社Optical modulator, controlling method and apparatus thereof, optical transmitter, and optical transmission system

NO-Patent Citations (1)

    Title
    JPN6013055263; '高速光多値信号のコヒーレント合成法' 電気学会電磁会理論研究会資料 Vol.EMT-10,No.62-101, 20100729, 45-50

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