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OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method
OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method
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机译:使用可调光带通滤波器和偏振消零方法的oSNR监测方法和装置
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摘要
The present invention provides a method and an apparatus for monitoring optical signal to noise ratio (OSNR) in a wavelength division multiplexing optical transmission system. The present invention utilizes a polarization nulling method and a tunable optical bandpass filter in order to reliably monitor the OSNR by considering a finite polarization nulling ratio, polarization mode dispersion and non-linear birefringence of the optical system in real time measurement of the OSNR. Further, the tunable optical bandpass filter is controlled to filter all wavelength bands of wavelength division multiplexed signals. Since the invention may monitor a plurality of demultiplexed optical signals with a single apparatus, the overall cost of the OSNR monitoring equipment is significantly reduced.
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