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US 2001/0055437 A1Published application
Compensation for polarization-mode dispersion in multiple wavelength-division multiplexed channels without separate composition for each individual channel
AssigneeUniversity of Southern California
InventorsReza Khosravani, Steven A. Havstad, Yong-Won Song, Paniz Ebrahimi, Alan E. Willner
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Abstract
Techniques for compensating for PMD in multiple WDM channels by processing all WDM channels in the same manner without demultpliexing the channels. A feedback control is provided to decrease the worst-case power penalty and the channel fading probability by optimizing over the entire group of WDM channels.
Claims20
A system, comprising:
- a polarization-mode dispersion (PMD) compensator operable to guide a plurality of wavelength-division multiplexed (WDM) optical channels through a common optical path to modify a differential group delay (DGD) in each channel, said PMD compensator operable to adjust said DGD in response to a control signal;
- and
- a feedback control coupled to measure a property of said channels as a whole and operable to generate said control signal according to said property.
A method, comprising:
- directing each of a plurality of wavelength-division multiplexed (WDM) optical channels through a common optical path to modify a differential group delay (DGD) in each channel so as to produce an output with modified WDM channels;
- measuring power of an AC portion of said output;
- and
- modifying the DGD to increase said power.
1 more element
A system, comprising:
- a polarization-mode dispersion (PMD) compensator operable to guide a plurality of wavelength-division multiplexed (WDM) optical channels through a common optical path to modify a differential group delay (DGD) in each channel, said common optical path comprising a plurality of adjustable units connected in series respectively operable to adjust the DGD in response to a plurality of control signals, respectively;
- and
- a feedback control coupled to measure a property of said channels as a whole after transmitting through said common optical path and operable to generate said control signals according to said property.
A method, comprising:
- directing each of a plurality of wavelength-division multiplexed (WDM) optical channels through a common optical path to modify a differential group delay (DGD) in each channel so as to produce an output with modified WDM channels;
- and
- controlling said DGD to reduce an overall signal fading in said output caused by polarization-mode dispersion (PMD) on all of said channels without separately compensating PMD in each channel.
Dependencies are inferred from the claim text.