Invention Grant
- Patent Title: Apparatus for measuring the wavelength, optical power and optical signal-to-noise ratio of each optical signal in wavelength-division multiplexing optical communication
- Patent Title (中): 用于测量波分复用光通信中每个光信号的波长,光功率和光信噪比的装置
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Application No.: US09524156Application Date: 2000-03-14
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Publication No.: US06396574B1Publication Date: 2002-05-28
- Inventor: Chang Hee Lee , Sang Yung Shin , Kwang Uk Chu
- Applicant: Chang Hee Lee , Sang Yung Shin , Kwang Uk Chu
- Priority: KR99-8593 19990315; KR99-34512 19990820
- Main IPC: G01N2100
- IPC: G01N2100

Abstract:
An apparatus for measuring the wavelength, optical power, and an optical signal-to-noise ratio (OSNR) of each optical signal in wavelength-division-multiplexing optical communication includes: elements for splitting a part of wavelength-division-multiplexed (WDM) signals, elements for amplifying the WDM signals and generating spontaneous emission light simultaneously, elements for reflecting a predetermined section of the spontaneous emission light and generating an optical reference signal, and elements for combining the optical reference signal with the part of the WDM signals split by the splitting elements and generating a combined light. The apparatus has components for filtering the combined light at a fixed temperature and generating a waveform which is the same as an optical spectrum of the combined light in the time domain. The apparatus includes elements for converting the waveform into an electrical signal and components for signal processing that measure the wavelength, the optical power, and the OSNR of the WDM signals.
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