NDLI: Joint Digital Preequalization for Spectrally Efficient Super Nyquist-WDM Signal

Content Provider	IEEE Xplore Digital Library
Author	Ze Dong Hung Chang Chien Zhensheng Jia Xinying Li
Copyright Year	1983
Abstract	We propose a joint digital preequalization scheme for a Nyquist wavelength division multiplexing (N-WDM) system to compensate for the intersymbol interference caused by a limited channel bandwidth or aggressive prefiltering. A digital raised-cosine pulse filter is implemented before the reference-based preequalization scheme to enhance the tolerance of the signal to the crosstalk from adjacent channels. The experiment illustrates eight-channel digital-analog-converter generation of the polarization division multiplexing quadrature phase shift keying system at 112 Gb/s per channel on a 25-GHz grid, adopting the reference-based digital preequalization considering narrow-band optical filtering effect at the transmitter. The experimental results show that the proposed preequalization scheme allows for an ultradense channel spacing of 0.89 times of the baud rate in the super N-WDM system with a as large as 5-dB optical signal-to-noise ratio improvement.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	3237
Ending Page	3242
Page Count	6
File Size	687834
File Format	PDF
ISSN	07338724
Volume Number	31
Issue Number	20
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical filters Optical transmitters Finite impulse response filters Optical crosstalk Optical noise Optical polarization Bit error rate wavelength division multiplexing Coherent detection digital preequalization Nyquist raised-cosine filter
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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