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US 6,748,150 B1Granted
Apparatus and method for managing dispersion within an optical add/drop module
AssigneeLucent Technologies Inc.
InventorsRanjan Dutta, Diego Fernando Grosz, Alejandra B. Gurevich, Alain P. Kung, Magaly Spector
Life of this patent
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Abstract
The invention comprises a method and apparatus for implementing a relatively low cost add/drop multiplexer (OADM) wherein pre-demux and post-mux dispersion compensation is employed in a manner that substantially avoids imparting additional dispersion compensation to pass-through wavelength channels in a WDM system.
Claims18
Apparatus, comprising:
- a first dispersion compensator, for imparting a first dispersion compensation to a group of optical channels from a wavelength division multiplexed (WDM) signal to produce a corresponding group of first dispersion compensated optical channels;
- an optical multiplexer, for multiplexing at least one of said group of first dispersion compensated optical channels with any additional optical channels to produce an output group of optical channels;
- and
- a second dispersion compensator, for imparting a second dispersion compensation to the output group of optical channels to produce a corresponding group of second dispersion compensated optical channels;
- said second dispersion compensation is selected to be an appropriate dispersion compensation for added optical channels;
- and
- said first dispersion compensation is selected to substantially cancel the effects of said second dispersion compensation imparted to said at least one of said group of first dispersion compensated optical channels provided to said multiplexer.
4 more elements
A method, comprising:
- imparting a first dispersion compensation to a group of optical channels from a wavelength division multiplexed (WDM) signal to produce a corresponding group of first dispersion compensated optical channels;
- multiplexing at least one of said group of first dispersion compensated optical channels with any additional optical channels to produce an output group of optical channels;
- and
- imparting a second dispersion compensation to the output group of optical channels to produce a corresponding group of second dispersion compensated optical channels;
- wherein
- said second dispersion compensation is selected to be an appropriate dispersion compensation for added optical channels;
- and
- said first dispersion compensation is selected to substantially cancel the effects of said second dispersion compensation imparted to said at least one of said group of first dispersion compensated optical channels provided to said multiplexer.
5 more elements
An optical add/drop multiplexer (OADM), comprising:
- a plurality of wavelength channel group processors, each of said wavelength channel group processors operative to selectively provide at least one of optical channel drop, pass through and add functions for those optical channels within a respective group of optical channels, each of said wavelength channel group processors comprising:
- a first dispersion compensator, for imparting a first dispersion compensation to a respective group of optical channels from a wavelength division multiplexed (WDM) signal to produce a corresponding group of first dispersion compensated optical channels;
- an optical multiplexer, for multiplexing at least one of said group of first dispersion compensated optical channels with any additional optical channels to produce an output group of optical channels;
- and
- a second dispersion compensator, for imparting a second dispersion compensation to the output group of optical channels to produce a corresponding group of second dispersion compensated optical channels;
- said second dispersion compensation is selected to be an appropriate dispersion compensation for added optical channels;
- and
- said first dispersion compensation is selected to substantially cancel the effects of said second dispersion compensation imparted to said at least one of said group of first dispersion compensated optical channels provided to said multiplexer.
5 more elements
Dependencies are inferred from the claim text.