Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-05-02
2006-05-02
Leung, Christina Y (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S034000, C398S196000
Reexamination Certificate
active
07039319
ABSTRACT:
Highly efficient control of laser frequency is provided. An optical channel monitor is coupled to a composite WDM signal resulting from the multiplexing of outputs from multiple laser sources. The monitor determines the frequency of each laser and this measurement is used to provide feedback for laser frequency control. In this way a single optical channel monitor can provide frequency control for numerous WDM channels, greatly reducing the cost and space required. Monitoring capability may be provided to individual channels as needed.
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Houle Alain
Moulton Grant
Aka Chan LLP
Cisco Technology Inc.
Leung Christina Y
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