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Tunable optical correlator using an optical frequency comb and a nonlinear multiplexer

Morteza Ziyadi, Mohammad Reza Chitgarha, Salman Khaleghi, Amirhossein Mohajerin-Ariaei, Ahmed Almaiman, Joe Touch, Moshe Tur, Carsten Langrock, Martin M. Fejer, and Alan E. Willner

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Abstract

We experimentally demonstrate a tunable optical correlator to search for multiple patterns among QPSK symbols. We utilize an optical frequency comb to generate the coherent signals and multiplex them coherently in a single PPLN waveguide. Multiple patterns with different lengths are successfully searched within QPSK symbols in a 40-Gb/s signal.

© 2013 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 Conceptual block diagram of a tunable optical correlator. (a) Mapping data stream into optical QPSK signals. (b) Concept of correlation for matched and unmatched patterns. (c) Coherent detection of optical correlator for 6 taps. (d) Optical correlator using two stages of nonlinearities and discrete pump lasers. (e) Optical correlator using one nonlinear stage and optical frequency comb source.

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Fig. 2
Fig. 2 Experimental setup for tunable optical correlator using an optical frequency comb. (MLL: Mode Lock Laser, DLI: Delay Line Interferometer, HNLF: Highly Nonlinear Fiber, BPF: Band Pass Filter, PC: Polarization Controller, EDFA: Erbium Doped Fiber Amplifier)

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Fig. 3
Fig. 3 Experimental result for coherent correlator output of different patterns. (a) 2-tap for pattern [CC] with EVM 9.8%. (b) 3-tap for pattern [ADB] with EVM8.3%. (c) 4-tap correlator for pattern [CCXXAA] with EVM 7.4%

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Fig. 4
Fig. 4 Experimental results for 6-tap coherent correlator output with the pattern peaks and corresponding optical data phase for (a) Pattern [DBCDCC]. (b) Pattern [BBCADB].

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Equations (1)

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A out ∝ ∑ i=1 N A pump * A D,i A F,i A S (t−iT)
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