Spectral monitoring device and method using data correlation for

Details Spectral monitoring device and method using data correlation for Spectral monitoring device and method using data correlation for

1997-11-26

2000-07-18

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359140, H04B 1008, H04J 1408

Patent

active

060915250

ABSTRACT:
A method and device for monitoring of the plural discrete wavelengths which carry data channels in a WDM optical signal. An input fiber provides a WDM optical signal to a splitter for dividing the signal into two portions. The first portion is provided to a dispersive delay line for delaying, in a temporally staggered manner, the channels of the WDM signal, following which the staggered signal is provided to an optic detector and converted to a first resulting electrical signal. The second portion of the WDM signal is either first converted to an electric signal and then provided to an adjustable electronic delay for delaying all components in the electrical signal by the same delay interval to produce a second resulting electrical signal, or is first provided to an adjustable optical delay for delaying the channels in the second portion by the same delay interval and then converting the delayed signal to the second resulting electrical signal. Finally, the first and second resulting optical signals are mixed together for various delay times of the electronic delay or optical delay and the results of the mixing of the signals are averaged by an integrator to obtain an output signal indicative of characteristics of the discrete wavelengths of the WDM optical signal.

REFERENCES:
patent: 5915052 (1999-06-01), Ball

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