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1.
  • Corcoran, William, 1983, et al. (creator_code:aut_t)
  • Noise beating in hybrid phase-sensitive amplifier systems
  • 2014
  • record:In_t: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 22:5, s. 5762-5771
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We investigate the effect of noise loading in a hybrid phase-sensitive amplifier system, analyzing the effect of noise beating between the signal and idler waves coupled in a parametric amplifier. Through analyzing input and output optical signal to noise ratios, we find that system performance of a phase-sensitive amplifier is 3 to 6 dB improved over a phase-insensitive amplifier, depending on the ratio of loaded noise power to that of vacuum fluctuations. (C) 2014 Optical Society of America
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2.
  • Kakande, Joseph, et al. (creator_code:aut_t)
  • Detailed characterization of a 
fiber-optic parametric amplifier in phase-sensitive and phase-insensitive operation
  • 2010
  • record:In_t: Optics Express. - 1094-4087 .- 1094-4087. ; 18:5, s. 4130-4137
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We experimentally demonstrate a single-pumped, non-degenerate phase-sensitive parametric amplifier with a precise control of phase and amplitude of the in-going waves and investigate in detail its gain, attenuation and saturation properties in comparison with operation in phase insensitive amplifier (PIA) mode. We experimentally observe the variation of the gain and attenuation as a function of the relative phase, pump power and the signal-idler power ratio. The phase sensitive gain spectrum is studied over a 24 nm symmetrical bandwidth and we achieve a maximum phase sensitive amplification (PSA) gain of 33 dB. A departure from the theoretical maximum attenuation as the gain increases is observed and explained.
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3.
  • Lorences Riesgo, Abel, 1987, et al. (creator_code:aut_t)
  • Experimental analysis of degenerate vector phase-sensitive amplification
  • 2014
  • record:In_t: Optics Express. - 1094-4087 .- 1094-4087. ; 22:18, s. 21889-21902
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We comprehensively investigate a degenerate vector phase-sensitive amplifier (PSA). We determine the gain dependence on the relative phase and polarization angle between the pumps and the degenerate signal wave. The vector PSA is experimentally shown to be sensitive to the pump states of polarization (SOP) due to polarization mode dispersion in the fiber. However, the scheme performance agrees well with theory under specific pump SOPs and we achieve an on-off gain over 10 dB with a small deviation from the theoretically expected results. In comparison to the scalar scheme, the proposed vector scheme has larger tolerance for pump depletion due to four-wave mixing between pumps and generation of higher-order idlers.
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4.
  • Lorences Riesgo, Abel, 1987, et al. (creator_code:aut_t)
  • Quadrature demultiplexing using a degenerate vector parametric amplifier
  • 2014
  • record:In_t: Optics Express. - 1094-4087 .- 1094-4087. ; 22:24, s. 29424-29434
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We report on quadrature demultiplexing of a quadrature phase-shift keying (QPSK) signal into two cross-polarized binary phase-shift keying (BPSK) signals with negligible penalty at bit-error rate (BER) equal to 10−9. The all-optical quadrature demultiplexing is achieved using a degenerate vector parametric amplifier operating in phase-insensitive mode. We also propose and demonstrate the use of a novel and simple phase-locked loop (PLL) scheme based on detecting the envelope of one of the signals after demultiplexing in order to achieve stable quadrature decomposition.
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5.
  • Lundström, Carl Peter, 1982, et al. (creator_code:aut_t)
  • Phase and amplitude characteristics of a phase-sensitive amplifier operating in gain saturation
  • 2012
  • record:In_t: Optics Express. - 1094-4087 .- 1094-4087. ; 20:19, s. 21400-21412
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We investigate a non-degenerate phase-sensitive amplifier (PSA) operating in gain saturation experimentally and numerically using the three-wave model. The phase-dependent gain and phase-to-phase transfer functions are obtained for different levels of saturation with good agreement between experimental and numerical data when higher-order FWM is small. Moreover, we identify an operating point where the PSA is found to be able to significantly reduce both phase-and amplitude noise simultaneously.
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6.
  • Olsson, Samuel L I, 1984, et al. (creator_code:aut_t)
  • Injection locking-based pump recovery for phase-sensitive amplified links
  • 2013
  • record:In_t: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 21:12, s. 14512-14529
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • An injection locking-based pump recovery system for phase-sensitive amplified links, capable of handling 40 dB effective span loss, is demonstrated. Measurements with 10 GBd DQPSK signals show penalty-free recovery of a pump wave, phase modulated with two sinusoidal RF-tones at 0.1 GHz and 0.3 GHz, with 64 dB amplification. The operating power limit for the pump recovery system is experimentally investigated and is governed by the noise transfer and phase modulation transfer characteristics of the injection-locked laser. The corresponding link penalties are explained and quantified. This system enables, for the first time, WDM compatible phase-sensitive amplified links over significant lengths.
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7.
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8.
  • Tong, Zhi, 1977, et al. (creator_code:aut_t)
  • Noise performance of optical fiber transmission links that use non-degenerate cascaded phase-sensitive amplifiers
  • 2010
  • record:In_t: Optics Express. - 1094-4087 .- 1094-4087. ; 18:15, s. 15426-15439
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Based on semi-classical theory, the noise performance of a multispan fiber optical transmission system employing a cascaded phaseinsensitive amplifier (PIA) and phase-sensitive amplifiers (PSAs) is investigated. Compared with the pure-PIA and pure-PSA based in-line amplification schemes, the copier + PSA scheme is found to improve the system NF by up to 6 and 3 dB, respectively, in an optimized long-haul fiber link, In addition, this cascaded configuration will significantly relax the requirement for accurate phase- and wavelength-locking which is rigorously needed in the pure-PSA configuration, This scheme is also modulation-format independent. As a proof of concept, the NF of a fiber parametric amplifier based copier + PSA cascade with inter-stage attenuation representing the fiber link is measured, which shows a 1.8-dB total NF improvement over the conventional EDFA cascade. © 2010 Optical Society of America.
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