OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method
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United States of America Patent
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Dec 12, 2006
Grant Date -
Jun 17, 2004
app pub date -
May 20, 2003
filing date -
Dec 16, 2002
priority date (Note) -
Expired
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Abstract
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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