DocumentCode :
1240533
Title :
Optical Signal Processing Using Tunable Delay Elements Based on Slow Light
Author :
Willner, Alan E. ; Zhang, Bo ; Zhang, Lin ; Yan, Lianshan ; Fazal, Irfan
Author_Institution :
Dept. of Electr. Eng. - Syst., Univ. of Southern California, Los Angeles, CA
Volume :
14
Issue :
3
fYear :
2008
Firstpage :
691
Lastpage :
705
Abstract :
Tunable optical delay lines have many applications for high-performance optical switching and signal processing. Slow light has emerged as an enabling technology for achieving continuously tunable optical delays. Delay reconfigurability opens up a whole new field of nonlinear signal processing using slow light. In this paper, the authors review recent advances in slow-light-based optical signal processing, with a focus on the data fidelity after traversing the slow light elements. The concept of slow-light-induced data pattern dependence is introduced and is shown to be the main signal degrading effect. We then propose and experimentally demonstrate phase-preserving slow light by delaying 10 Gb/s differential phase-shift keying (DPSK) signals with reduced DPSK pattern dependence. Spectrally efficient slow light using advanced multilevel phase-modulated formats is further described. With this technique, doubled bit-rate signals can be transmitted through a bandwidth-limited slow light element. We finally show several novel slow-light-based signal processing modules. Unique features such as multichannel operation, variable bit-rate capability, and simultaneous multiple functions are highlighted.
Keywords :
differential phase shift keying; optical communication equipment; optical delay lines; optical fibre communication; optical information processing; optical modulation; optical tuning; DPSK; differential phase-shift keying; doubled bit-rate signals; multichannel operation; multilevel phase-modulated formats; multiple functions; nonlinear signal processing; optical switching; phase-preserving slow light; slow light based optical signal processing; tunable optical delay lines; variable bit-rate; Delay effects; Delay lines; Differential quadrature phase shift keying; Fiber nonlinear optics; Nonlinear optics; Optical buffering; Optical filters; Optical scattering; Optical signal processing; Slow light; Differential phase-shift keying (DPSK); differential quadrature phase-shift keying (DQPSK); multichannel operation; nonlinear fiberoptics; optical signal processing; optical time-division multiplexing (OTDM); pattern dependence; phase-preserving; slow light; stimulated Brillouin scattering (SBS); synchronization; tunable delay line; variable bit rate;
fLanguage :
English
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
1077-260X
Type :
jour
DOI :
10.1109/JSTQE.2007.914659
Filename :
4538068
Link To Document :
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