Regeneration of DPSK Signals in a Saturated SOA

Porzi, Claudio; Bogoni, Antonella; Contestabile, G.

doi:10.1109/lpt.2012.2210399

Cited by 20 publications

(5 citation statements)

References 11 publications

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“…All-optical processing of phase-modulated data is thus of great importance in this scenario and, in this sense, several works investigated simultaneous regeneration and wavelength conversion for differential phase shift keying (DPSK) modulation format [3][4][5][6][7][8]. For instance, phase-sensitive amplification in nonlinear fiber has been proposed for realizing regenerative wavelength conversion of binary phase-modulated data [3].…”

Section: Open Accessmentioning

confidence: 99%

“…Other approaches exploited DPSK-to-OOK conversion followed by a reshaping nonlinear interferometer stage where signal regeneration and back-encoding to DPSK format at a new wavelength takes place [4,5]. Four-wave mixing (FWM) effect in both fibers [6] and semiconductor optical amplifiers (SOAs) [7,8] has been also proposed to perform phase-modulated signals amplitude regeneration without altering their phase information by introducing excess phase noise. The advantage of this phase-preserving amplitude regeneration approach for phase-modulated data relies in a simpler implementation in respect to coherent architectures and in interferometer-based schemes.…”

Section: Open Accessmentioning

confidence: 99%

“…Since the shorter-wavelength FWM term exhibits the highest conversion efficiency [14], it will be considered in the following. In presence of degraded DPSK input data, with a proper choice of input power levels, FWM signal at SOA output features a higher quality with respect to input signal [8]. The optical regeneration of the DPSK signal is originated by the strong amplitude-limiting capability of the saturated SOA, in conjunction with very small amplitude-to-phase noise transfer occurring in the amplifier [15].…”

Section: Set-up and Principlementioning

confidence: 99%

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Polarization-Independent All-Optical Regenerator for DPSK Data

et al. 2014

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Abstract:We demonstrate polarization-independent simultaneous all-optical phase-preserving amplitude regeneration and wavelength conversion of NRZ differential phase shift keying (DPSK) data by four-wave mixing (FWM) in a semiconductor optical amplifier (SOA). The dependence upon polarization state of the signals is eliminated by using a co-polarized dual-pump architecture. Investigation on the regenerative capability vs. pumps detuning shows significant BER threshold margin improvement over 6 nm conversion range.

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Section: Open Accessmentioning

confidence: 99%

Section: Open Accessmentioning

confidence: 99%

Section: Set-up and Principlementioning

confidence: 99%

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Polarization-Independent All-Optical Regenerator for DPSK Data

et al. 2014

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“…Its lower size, lower power consumption and wider bandwidth makes it a potentially cheaper alternative for erbium-doped fiber amplifiers (EDFAs) as power boosters in transmitters, in-line amplifiers, and receiver preamplifiers [4]. Furthermore, besides performing as amplifiers, SOA nonlinearities make them very attractive for applications like demultiplexing, wavelength conversion and signal regeneration [5][6][7]. For DQPSK transmission, four wave mixing is particularly interesting, because it preserves the phase of the input signal.…”

Section: Introductionmentioning

confidence: 99%

40 Gb/s NRZ-DQPSK Data All-Optical Wavelength Conversion Using Four Wave Mixing in SOA

Krzczanowicz

Connelly

2014

25th IET Irish Signals &Amp; Systems Conference 2014 and 2014 China-Ireland International Conference on Information and Communi

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DQPSK modulation has become particularly attractive in high-speed optical communications because of its resistance to fiber nonlinearities and its more efficient use of fiber bandwidth. Because of its wavelength conversion ability, SOA four wave mixing effect has attracted much attention. We experimentally study the FWM wavelength conversion of 40 Gbit/s (20 Gbaud) NRZ-DQPSK data. A bulk SOA with 21 dB gain and 10 dBm output saturation power is used. The Q factors of the input and wavelength converted signal are measured. Some signal regeneration properties are shown. A Q-factor improvement of maximum 1.7 dB is observed. The authors make an attempt at recreating the experiment with a prototype Quantum Dot SOA. FWM efficiency of a QD-SOA with 15 dB fiber-to-fiber gain and 3 dBm output saturation power is measured.Keywords -All-optical regeneration, differential phase-shift keying (DPSK), four wave mixing (FWM), semiconductor optical amplifiers (SOAs).

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“…In contrast to the materials above operating on variations of the Kerr effect, nonlinearity in SOA's is mediated by carrier excitation enabling signal processing with significantly lower optical power levels [16]. SOAs have been previously demonstrated in many FWM based devices including wavelength conversion [17], clock recovery [18],optical sampling [19] and optical regeneration [20], but very little work has been performed on phase sensitive applications [21,22]. In this paper, we report on the first ever multi-channel regeneration in a semiconductor optical amplifier [22].…”

Section: Introductionmentioning

confidence: 99%

Phase Sensitive Signal Processing using Semiconductor Optical Amplifiers

Ellis

Sygletos

2013

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013

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This paper examines recent progress in the use of semiconductor optical amplifiers for phase sensitive signal processing functions, a discussion of the world's first multi-wavelength regenerative wavelength conversion using semiconductor optical amplifiers for BPSK signals. IntroductionAn impending capacity crunch has been widely discussed recently, arising from the inability of a single optical fiber strand to continue to support the exponentially growing traffic demands [1]. Many solutions have been proposed including novel optical amplifiers, installation of new fibers to allow spatial multiplexing and the re-emergence of optical regeneration [2]. Of these only optical regeneration offers a significant increase in the overall capacity of a fully populated link without significant increases in cost or power consumption. Conventional (Silica based) highly nonlinear fiber (HNLF) with high SBS threshold has proven effective in enabling many of the essential features of a future all optical regenerator, including• Operation with phase encoded signals, to ensure compliance with coherently detected signal formats [3,4] • Multi-wavelength operation, to ensure cost competitiveness with optical amplifiers [5]• Simultaneous amplitude and phase regeneration, to give the prospects of regeneration of QAM signals [6] • Quantum limited performance, to maximize performance benefits [7] Despite the excellent fiber performance [eg 8] these reports typically employ at least one high power (Watt class) optical amplifier, reducing the prospects for compact and low energy consumption devices. Several alternative material systems exist for the production of nonlinear devices based on four wave mixing processes including periodically poled lithium niobate [9], photonic crystal [10] and/or bismuth fiber [11,12], calcogenide planar waveguides [13], polymer clad silicon waveguides [14] and amorphous silicon [15], unfortunately when practical configurations are considered such devices either require higher pump powers than for the equivalent function in HNLF, or have power handling limitations such as two photon absorption or the Staebler-Wronski effect. In contrast to the materials above operating on variations of the Kerr effect, nonlinearity in SOA's is mediated by carrier excitation enabling signal processing with significantly lower optical power levels [16]. SOAs have been previously demonstrated in many FWM based devices including wavelength conversion [17], clock recovery [18],optical sampling [19] and optical regeneration [20], but very little work has been performed on phase sensitive applications [21,22]. In this paper, we report on the first ever multi-channel regeneration in a semiconductor optical amplifier [22]. This is achieved in a fully "black box", fiber in -fiber out configuration, operating with phase modulated data. The system summarized here employs semiconductor devices for all active functions, opening the possibility of a fully integrated optical subsystem. Optical power requirements are modest (< 4mW...

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Regeneration of DPSK Signals in a Saturated SOA

Cited by 20 publications

References 11 publications

Polarization-Independent All-Optical Regenerator for DPSK Data

Polarization-Independent All-Optical Regenerator for DPSK Data

40 Gb/s NRZ-DQPSK Data All-Optical Wavelength Conversion Using Four Wave Mixing in SOA

Phase Sensitive Signal Processing using Semiconductor Optical Amplifiers

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