DWDM laser frequency control

Optical communications – Multiplex – Wavelength division or frequency division

Reexamination Certificate

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Details

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.

REFERENCES:
patent: 5894362 (1999-04-01), Onaka et al.
patent: 6078601 (2000-06-01), Smith
patent: 6271944 (2001-08-01), Schemmann et al.
patent: 6304350 (2001-10-01), Doerr et al.
patent: 6441955 (2002-08-01), Takatsu et al.
patent: 2002/0048063 (2002-04-01), Jung et al.
patent: 981212 (2000-02-01), None

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