Article

All-Optical regeneration of differential phase-shift keyed signals based on phase-sensitive amplification

Center for Research and Education in Optics and Lasers, University of Central Florida, Orlando, Florida, United States
Optics Letters (Impact Factor: 3.29). 11/2004; 29(20):2357-9. DOI: 10.1364/OL.29.002357
Source: PubMed

ABSTRACT

All-optical regeneration of differential phase-shift keyed signals based on phase-sensitive amplification in a nonlinear fiber Sagnac interferometer is described. Nearly ideal phase regeneration can be achieved in the undepleted pump regime, with output differential phase noise limited only by fast fluctuations of the pump phase relative to the DPSK signal. Operating in the depleted pump regime offers the possibility of simultaneously regenerating both phase and amplitude information of DPSK signals while providing low noise, phase-sensitive gain.

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    • "In fiber optic systems phase-sensitive amplification can be realized either through the use of a nonlinear optical loop mirror (NOLM) [8], [9] or via four-wave mixing [14]–[16]. While both have successfully been demonstrated, the four-wave mixing approach is advantageous as it offers the possibility of using multiple channels and therefore supports wavelength division multiplexing (WDM) type applications. "
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    ABSTRACT: The properties of phase-sensitive amplification (PSA) in highly nonlinear fibers are studied. We present a soft glass fiber designed for high nonlinearity and broadband, low dispersion and simulate its performance as a PSA device for ultrafast bitrate signals at 640 Gb/s. The effect of the fiber design parameters on its PSA performance have been studied and the final design has been optimized using a genetic algorithm to have a high nonlinearity and low, flat dispersion. This design has subsequently been compared to other highly nonlinear fibers in order to highlight the effect of both using soft glass and the design and optimization technique. Modelled fiber performance shows squeezing of phase noise in a 5 m length of fiber with 32 dBm total power in the signal and pumps. The fiber length we have used in our model is two orders of magnitude shorter than the state of the art silica based PSA devices for comparable power levels. In addition, fabrication tolerance modelling is done to show that our fiber design is better able to manage fluctuations in the dispersion due to the high nonlinearity.
    Full-text · Article · Nov 2012 · Journal of Lightwave Technology
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    • "Among various approaches, polarization-division-multiplexing (PDM) is one of the enabling techniques that can double the system capacity directly by carrying two data channels on orthogonal polarization states but at the same wavelength [2], [3], and over the past few years, numerous PDM-based hero experiments have been demonstrated [4]–[6]. On the other hand, all-optical regeneration is a potential enabler for future all-optical networks [7]–[25], as it may simplify the network configuration without complicated and bit-rate dependent optical-electrical-optical (O-E-O) conversion. Many schemes of all-optical regeneration have been demonstrated based on different nonlinear mechanisms and different nonlinear media for various modulation formats. "
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    ABSTRACT: Schemes of all-optical regeneration in polarization-division-multiplexing (PDM) systems are proposed and demonstrated with 2 × 10-Gb/s return-to-zero on-off-keying (RZ-OOK) transmission. Regeneration is achieved based on self-phase-modulation (SPM) effect and detuned filtering in highly nonlinear fiber (HNLF) with a polarization-diversified loop configuration. Furthermore, the ability of mitigating polarization-mode-dispersion (PMD) effects in PDM systems is evaluated. More than 3.7-dB eye-diagram-based signal-to-noise-ratio (SNR) improvement is achieved in the presence of 6.3-ps PMD as the pulsewidth of the PDM signal is about 18 ps.
    Preview · Article · Sep 2011 · IEEE Photonics Journal
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    • "With the development of optical communication techniques, phase modulation formats has become more and more attractive. A lot of researches of regeneration of Binary Phase-Shift Keyed (BPSK) signals and Differential Binary Phase-Shift Keyed (DBPSK) signals have been done, such as Raman-Amplified Nonlinear Optical Loop Mirror (RA- NOLM)-based amplitude regenerator [6], phase-preserving amplitude limiter [7] [8], Semiconductor Optical Amplifier (SOA)-based regenerative amplifier [9] and Phase-Sensitive Amplifiers (PSAs) [10] [11] [12] [13]. Quadrature Phase-Shift Keying (QPSK), especially Differential Quadrature Phase-Shift Keying (DQPSK), as an advanced modulation format can offer advantages such as higher spectral efficiency and better dispersion and PMD tolerance compared to (D)BPSK [14] [15] [16]. "
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    ABSTRACT: An all-optical regenerator for Quadrature Phase-Shift Keying (QPSK) and Differential Quadrature Phase-Shift Keying (DQPSK) signals based on Phase-Sensitive Amplifiers (PSAs) is studied through numerical simulations. It is found that the regenerator can provide significant suppression of both amplitude and phase noise, and that the BER performance of the regenerated signals can be greatly improved.
    Full-text · Article · Nov 2008 · Proceedings of SPIE - The International Society for Optical Engineering
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