Title

Phase and amplitude regeneration of differential phase-shift keyed signals using phase-sensitive amplification

Authors

Authors

K. Croussore;G. F. Li

Comments

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Abbreviated Journal Title

IEEE J. Sel. Top. Quantum Electron.

Keywords

all-optical communications; amplitude regeneration; four-wave mixing; nonlinear interferometer (NI); phase-sensitive amplification (PSA); phase-shift keying (PSK); phase regeneration; ZERO-DISPERSION FREQUENCY; RZ-DPSK SIGNALS; LINEAR-AMPLIFIERS; SOLITON; SYSTEMS; OPTICAL AMPLIFICATION; CONSTANT DISPERSION; NOISE-FIGURE; FIBER; TRANSMISSION; COMPENSATION; Engineering, Electrical & Electronic; Optics; Physics, Applied

Abstract

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 par tially 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.

Journal Title

Ieee Journal of Selected Topics in Quantum Electronics

Volume

14

Issue/Number

3

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

648

Last Page

658

WOS Identifier

WOS:000256624900014

ISSN

1077-260X

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