NDLI: Methods for crosstalk measurement and reduction in dense WDM systems

Content Provider	IEEE Xplore Digital Library
Author	Ho, K.-P. Kahn, J.M.
Copyright Year	1983
Abstract	We propose a scheme for the monitoring and reduction of crosstalk arising from the limited stop-band rejection of optical bandpass filters in dense WDM systems. The optical carrier at each wavelength is modulated with a subcarrier tone unique to that wavelength. The level of crosstalk from a given channel can be determined by measuring the power of the corresponding tone. Crosstalk from other channels can be cancelled in a linear fashion by weighting and summing the photocurrents of the desired channel and several adjacent interfering channels. Alternatively, in nonlinear crosstalk cancellation, decisions are made on the interfering signals, and these decision are weighted and summed with the photocurrent of the desired channel. For example, assuming an optical filter having a Gaussian passband, the channel density can be increased from 20 to 30%, depending on the number of adjacent channels detected. The signal-to-interference ratio can be increased by 10-20 dB and the system can achieve a BER<10/sup -9/ under conditions where, without interference cancellation, the signal-to-interference ratio would be less then 10 dB.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	1127
Ending Page	1135
Page Count	9
File Size	1096653
File Format	PDF
ISSN	07338724
Volume Number	14
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wavelength division multiplexing Optical filters Wavelength measurement Nonlinear optics Optical crosstalk Optical modulation Photoconductivity Monitoring Band pass filters Power measurement
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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