Article

# All-optical regeneration of differential phase-shift keying signals based on phase-sensitive amplification.

Center for Research and Education in Optics and Lasers, University of Central Florida, Orlando, Florida 32816, USA.

Optics Letters (Impact Factor: 3.18). 11/2004; 29(20):2357-9. DOI: 10.1364/OL.29.002357 Source: PubMed

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**ABSTRACT:**Since Shannon derived the seminal formula for the capacity of the additive linear white Gaussian noise channel, it has commonly been interpreted as the ultimate limit of error-free information transmission rate. However, the capacity above the corresponding linear channel limit can be achieved when noise is suppressed using nonlinear elements; that is, the regenerative function not available in linear systems. Regeneration is a fundamental concept that extends from biology to optical communications. All-optical regeneration of coherent signal has attracted particular attention. Surprisingly, the quantitative impact of regeneration on the Shannon capacity has remained unstudied. Here we propose a new method of designing regenerative transmission systems with capacity that is higher than the corresponding linear channel, and illustrate it by proposing application of the Fourier transform for efficient regeneration of multilevel multidimensional signals. The regenerative Shannon limit-the upper bound of regeneration efficiency-is derived.Nature Communications 05/2014; 5:3861. · 10.74 Impact Factor -
##### Conference Paper: Multi-wavelength regeneration of phase encoded signals based on phase sensitive amplifiers

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**ABSTRACT:**Future high capacity optical links will have to make use of frequent signal regeneration to enable long distance transmission. In this respect, the role of all-optical signal processing becomes increasingly important because of its potential to mitigate signal impairments at low cost and power consumption. More substantial benefits are expected if regeneration is achieved simultaneously on a multiple signal band. Until recently, this had been achieved only for on-off keying modulation formats. However, as in future transmission links the information will be encoded also in the phase for enhancing the spectral efficiency, novel subsystem concepts will be needed for multichannel processing of such advanced signal formats. In this paper we show that phase sensitive amplifiers can be an ideal technology platform for developing such regenerators and we discuss our recent demonstration of the first multi-channel regenerator for phase encoded signals.Transparent Optical Networks (ICTON), 2012 14th International Conference on; 01/2012 - [Show abstract] [Hide abstract]

**ABSTRACT:**We propose and demonstrate an all-optical phase noise reduction scheme that uses optical nonlinear mixing and tunable optical delays to suppress the low-speed phase noise induced by laser linewidth. By utilizing the phase conjugate copy of the original signal and two narrow-linewidth optical pumps, the phase noise induced by laser linewidth can be reduced by a factor of ∼5 for a laser with 500-MHz phase noise bandwidth. The error-vector-magnitude can be improved from ∼30% to ∼14% for the same laser linewidth for 40-Gbit/s quadrature phase shift keying signal.Optics Letters 05/2014; 39(10):2928-2931. · 3.39 Impact Factor

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