Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-11-26
2000-06-13
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359127, 359131, 359634, H04J 1402
Patent
active
060756322
ABSTRACT:
An optical noise monitor measures noise power within narrow wavelength regions between channel signals of a dense wavelength division multiplexed (DWDM) signal. The noise monitor receives the DWDM signal and cascades the signal along a multipoint travel path where the signal is incident on a series of multi-pass filters. Each multi-pass filter selects a narrow, predefined wavelength region between channel signals of the DWDM signal. Noise power within the predefined wavelength region is detected and SNR is monitored by comparing the detected noise power to the power in the channel signal. According to a first preferred embodiment of the present invention, the noise monitor includes multi-pass filters that each have reflective surfaces to guide optical energy within a predefined wavelength region through multiple passes of an optical filter. According to a second preferred embodiment of the present invention, the noise monitor includes multi-pass filters each having a serial arrangement of multiple optical filters.
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J. M. Vaughan MA, DPhil--"The Fabry--Perot Interferometer, History, Theory, Practice and Applications"; The Adam Hilger Series on Optics and Optoelectronics; Adam Hilger, Bristol and Philadelphia; pp. 235-253.
Hewlett--Packard Company
Imperato John L.
Lieu Vu T.
Pascal Leslie
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