Amplitude Regeneration of RZ-DPSK Signals in Single-Pump Fiber-Optic Parametric Amplifiers

The input power tolerance of a single-pump fiber-optic parametric amplifier (FOPA) is experimentally shown to be enhanced for return-to-zero differential phase-shift keying (RZ-DPSK) modulation compared to RZ on-off keying modulation at 40 Gb/s. The improved nonlinear tolerance is exploited to demon...

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Bibliographic Details
Published in:IEEE photonics technology letters 2009-07, Vol.21 (13), p.872-874
Main Authors: Peucheret, C., Lorenzen, M., Seoane, J., Noordegraaf, D., Nielsen, C.V., Gruner-Nielsen, L., Rottwitt, K.
Format: Article
Language:English
Subjects:
Amplitudes
Differential amplifiers
Differential phase shift keying
Differential phase-shift keying (DPSK)
Distortion
Fiber nonlinear optics
Fiber optics
fiber-optic parametric amplifier (FOPA)
Modulation
Noise levels
Nonlinear distortion
Nonlinear optics
Optical distortion
Optical fiber amplifiers
Optical fibers
optical regeneration
Phase modulation
Power amplifiers
Regeneration
Stimulated emission
Tolerances
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Summary:The input power tolerance of a single-pump fiber-optic parametric amplifier (FOPA) is experimentally shown to be enhanced for return-to-zero differential phase-shift keying (RZ-DPSK) modulation compared to RZ on-off keying modulation at 40 Gb/s. The improved nonlinear tolerance is exploited to demonstrate amplitude regeneration of a distorted RZ-DPSK signal in a gain-saturated FOPA. An optical signal-to-noise ratio penalty of 3.5 dB after amplitude distortion is shown to be reduced to 0.2 dB after the FOPA, thus clearly demonstrating the regenerative nature of saturated FOPAs for RZ-DPSK modulation.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2009.2019968