Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2007-09-25
2007-09-25
Chan, Jason (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
Reexamination Certificate
active
10461626
ABSTRACT:
An apparatus and method for simultaneous channel and optical signal-to-noise ratio (OSNR) monitoring is adapted to function in multi-channel wavelength-division-multiplexed (WDM) optical communication systems. A polarization controller is sequentially adjusted to perform the sequential polarization control with an optical signal. A polarization-selective electro-optic modulator acts as a polarizer and provides a signal dithering to improve the detection sensitivity. A beam splitter splits the dithered optical signal into two clusters. A photodetector receives the first cluster and measures the OSNR. An optical element receives the second cluster and monitors the channel wavelength of multiple channels. The apparatus can be packaged into a compact module and integrated on a chip. The channel monitoring covers a wide wavelength range and is tunable. The OSNR monitoring can be accurate over a wide dynamic range.
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Lee San-Liang
Wu Jui-Ting
Yang Chun-Liang
Yang Ming-Hsiao
Chan Jason
Industrial Technology Research Institute
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