29 January 2008 Tunable delay lines using slow light for Gbit/s data signal
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Optical tunable delay lines have many applications for high-performance optical switching and signal processing. Slowlight has emerged as an enabling technology for achieving continuously tunable optical delays. The reconfigurable delay opens up a whole new field of nonlinear signal processing using slow light. In this paper, we 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-phaseshift- keying (DPSK) signals with reduced DPSK data pattern dependence. Spectrally-efficient slow light using advanced multi-level phase-modulated format is further described. With this technique, doubled or even tripled 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 multi-channel operation and variable bit-rate capability are highlighted.
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Alan E. Willner, Alan E. Willner, Bo Zhang, Bo Zhang, } "Tunable delay lines using slow light for Gbit/s data signal", Proc. SPIE 6904, Advances in Slow and Fast Light, 690409 (29 January 2008); doi: 10.1117/12.774180; https://doi.org/10.1117/12.774180

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