Journal
OPTICS LETTERS
Volume 43, Issue 22, Pages 5563-5566Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.005563
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Funding
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-1-0166]
- National Science Foundation (NSF) [Y501119]
- Vannevar Bush Faculty Fellowship program - Basic Research Office of the Assistant Secretary of Defense for Research and Engineering
- Office of Naval Research (ONR) [N00014-16-1-2813]
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We experimentally demonstrate a scalable and reconfigurable optical tapped-delay-line (TDL) for multichannel equalization and correlation of 20-Gbaud quadrature-phase-shift-keyed (QPSK) signals using nonlinear wave mixing and a microresonator Kerr frequency comb. The optical TDL mainly consists of two stages: one being a multi-casting of the original signals in a periodically poled lithium niobate (PPLN) waveguide with Kerr comb lines functioning as mutually coherent pumps, while the other is a coherent multiplexing of the delayed and weighted signal replicas in a second PPLN. A two- or three-tap optical TDL is demonstrated to simultaneously equalize a distorted QPSK data signal, reducing the error vector magnitude (EVM) from 22.5% to either 19.9% or 18.2%, and search two- or three-symbol patterns on another QPSK signal. (C) 2018 Optical Society of America
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