Michael Vasilyev

Prof. Michael Vasilyev

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Research Focus & Metrics

Academic Career Length

33Years (1994-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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6 September 1999 in Physical Review Letters
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SCSang-Kyung Choi
Sang-Kyung Choi
MVMichael Vasilyev
Michael Vasilyev
PKPrem Kumar
Prem Kumar
We used a spatially broadband optical parametric amplifier for image amplification. In the phase-sensitive configuration of the amplifier, we observed noiseless amplification of input images. For a gain of ≃2.5, we measured noise-figure values of ( 0.2±0.6) and ( 0.4±0.5) dB, respectively, for two amplifiers of different lengths. These experimental values agree with theory (for an ideal noiseless amplifier the noise figure is 0 dB) and are almost 2 dB lower than the quantum limit of an ideal phase-insensitive amplifier.

1 January 2005 in Optics Express
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MVMichael Vasilyev
Michael Vasilyev
We propose a phase-sensitive amplifier scheme that balances fiber loss and parametric gain everywhere in a fiber span. We show that, for long links, such a distributed phase-sensitive amplifier has a 3-dB lower noise figure than an ideal distributed phase-insensitive amplifier (e.g. Raman), even if simple direct detection is employed. This sets the ultimate limit for the optimum noise-nonlinearity trade-off in transmission systems.

1 January 2005 in Optics Express
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RTRenyong Tang
Renyong Tang
JLJacob Lasri
Jacob Lasri
PDPreetpaul S. Devgan
Preetpaul S. Devgan
VGVladimir Grigoryan
Vladimir Grigoryan
PKPrem Kumar
Prem Kumar
MVMichael Vasilyev
Michael Vasilyev
We experimentally demonstrate, for the first time to our knowledge, a phase-sensitive amplifier based on frequency nondegenerate parametric amplification in optical fiber, where the input signal-idler pair is prepared all-optically. Using two fiber-optic parametric amplifier sections separated by a fiber-based wavelength-dependent phase shifter, we observe and investigate phase-sensitive gain profile in the 1550 nm region both experimentally and theoretically. The realized scheme automatically generates gain-defining phase that is environmentally stable, making it advantageous for building phase-sensitive transmission links.

13 March 2000 in Physical Review Letters
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MVMichael Vasilyev
Michael Vasilyev
SCSang-Kyung Choi
Sang-Kyung Choi
PKPrem Kumar
Prem Kumar
Giacomo Mauro D'ArianoGiacomo Mauro D'Ariano
Giacomo Mauro D'Ariano
We report the first measurement of the joint photon-number probability distribution for a two-mode quantum state created by a nondegenerate optical parametric amplifier. The measured distributions exhibit up to 1.9 dB of quantum correlation between the signal and idler photon numbers, whereas the marginal distributions are thermal as expected for parametric fluorescence.

15 June 2005 in Optics Letters
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MVMichael Vasilyev
Michael Vasilyev
TLTaras I. Lakoba
Taras I. Lakoba
We propose the design of an all-optical 2R regenerator capable of handling multiple wavelength-division-multiplexed channels simultaneously. It extends the known concept of off-center filtering of self-phase-modulation-broadened signal spectra. The novel feature of the proposed device is a dispersion map that strongly suppresses interchannel impairments. The map employs several sections of nonlinear fiber with high normal dispersion, separated by dispersion compensators with spectrally periodic group delay. The results of our numerical simulations indicate the feasibility of such a multichannel regenerator.

15 July 1999 in Optics Letters
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DLDmitry Levandovsky
Dmitry Levandovsky
MVMichael Vasilyev
Michael Vasilyev
PKPrem Kumar
Prem Kumar
We experimentally demonstrate generation of bright sub-Poissonian light by means of parametric deamplification in a phase-sensitive fiber amplifier that is based on a balanced nonlinear Sagnac interferometer. On direct detection, the photocurrent noise falls below the shot-noise limit by 0.6±0.2 dB (1.4 dB when corrected for detection losses). To observe the noise reduction we employed a scheme that used two orthogonally polarized pulses to cancel the noise that arises from the predominantly polarized guided-acoustic-wave Brillouin scattering in the fiber. We also present a simplified semiclassical theory of quantum-noise suppression by this amplifier, which is found to be in good agreement with the experimental results.