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IEEE Photonics Technology Letters

Wide Bandwidth Experimental Study of Nondegenerate Phase-Sensitive Amplifiers in Single- and Dual-Pump Configurations

Joseph Kakande, Francesca R. Parmigiani, Morten Ibsen, Periklis Petropoulos, David John Richardson

Published Oct 8, 2010• 14 citations
Publisher

Abstract

We experimentally demonstrate nondegenerate phase-sensitive amplification of a 40-Gb/s differential phase-shift-keying data signal in both single- and double-pumped parametric configurations. Careful optimization of the system has allowed a uniform phase-sensitive gain and attenuation to be achieved over at least 20 nm of bandwidth.
DOI
10.1109/lpt.2010.2084994

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Phase-sensitive amplifiers (PSAs) offer numerous advantages over phase-insensitive amplifiers in optical communications. Squeezing of optical phase through PSA can remove accumulated phase jitter, which is a critical functionality for an all- optical, phase-shift keyed network. In recent experiments, reviewed in this report, different implementations of PSA were used for phase regeneration of both return-to-zero differential phase-shift keying and nonreturn-to-zero differential phase-shift keying data. The first demonstration explored the properties and performance of PSA that occurs in nonlinear interferometers. Experiments confirmed that a PSA operating in the depleted pump regime provides simultaneous reduction of amplitude and phase noise (PN). Phase regeneration performance limit was reached as a consequence of pump-wave imperfections, which can be significantly reduced through proper design. PSA that occurs directly in fiber in a traveling-wave configuration through partially degenerate four-wave mixing was also studied. The latter implementation offers stronger phase-matched gain and suppression of amplitude-to-phase noise conversion. Technical issues that remain to be addressed are identified for each implementation. Results characterized using coherent detection offer direct measurements of the phase-regenerative behavior.
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