Coherent correlator and equalizer using a reconfigurabl all-optical tapped delay line

Mohammad Reza Chitgarha*, Salman Khaleghi, Omer F. Yilmaz, Moshe Tur, Michael W. Haney, Carsten Langrock, Martin M. Fejer, Alan E. Willner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We experimentally demonstrate a reconfigurable optical tapped delay line in conjunction with coherent detection to search multiple patterns among quadrature phase shift keying (QPSK) symbols in 20 Gbaud data channel and also to equalize 20 and 31 Gbaud QPSK, 20 Gbaud 8 phase shift keying (PSK), and 16 QAM signals. Multiple patterns are searched successfully on QPSK signals, and correlation peaks are obtained at the matched patterns. QPSK, 8 PSK, and 16 QAM signals are also successfully recovered after 25 km of SMF-28 with average EVMs of 8.3%, 8.9%, and 7.8%. A penalty of <1 dB optical signal to noise penalty is achieved for a 20 Gbaud QPSK signal distorted by up to 400 ps/nm dispersion.

Original languageEnglish
Pages (from-to)2271-2273
Number of pages3
JournalOptics Letters
Volume38
Issue number13
DOIs
StatePublished - 1 Jul 2013

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