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    • 6. 发明专利
    • Front end device
    • 前端设备
    • JP2013195584A
    • 2013-09-30
    • JP2012061225
    • 2012-03-16
    • Fujitsu Ltd富士通株式会社
    • HIRONISHI KAZUOHOSHIDA GOJI
    • G02B6/42H04B10/67H04J14/00H04J14/02
    • H04B10/60H04B10/0775H04J14/0258H04Q2011/0024H04Q2011/0026
    • PROBLEM TO BE SOLVED: To highly sensitively detect superposed signals superposed on a plurality of optical signals of a WDM optical signal respectively.SOLUTION: A front end device receives a WDM optical signal including a plurality of optical signals each having a superposing signal superposed thereon by frequency modulation. The front end device includes: an optical filter configured to have a transmittance being periodically changed with respect to a wavelength and a wavelength with which a peak of the transmittance appears being shifted according to an incident angle; an optical structure configured to guide the WDM optical signal to the optical filter so that the WDM optical signal enters the optical filter at a plurality of different angles; and an optical receiver configured to convert an optical signal output from the optical filter to an electrical signal.
    • 要解决的问题:高灵敏度地检测叠加在WDM光信号的多个光信号上的叠加信号。解决方案:前端设备接收包括多个光信号的WDM光信号,每个光信号具有叠加信号,叠加信号由 调频。 前端装置包括:滤光器,被配置为使透射率相对于波长周期性地变化,并且透射率峰出现的波长根据入射角度而偏移; 光学结构,其被配置为将所述WDM光信号引导到所述滤光器,使得所述WDM光信号以多个不同的角度进入所述滤光器; 以及光接收器,被配置为将从所述滤光器输出的光信号转换为电信号。