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Optics Letters

Amplitude squeezing with a Fabry–Perot semiconductor laser: existence of an optimum biasing condition

J.-L. Vey, Philippe B. Gallion

Published Oct 1, 1995• 11 citations
Publisher

Abstract

The effect of gain suppression on amplitude squeezing with a Fabry-Perot semiconductor laser is studied with a semiclassical model. A strong decrease of the internal amplitude noise and an optimum biasing point with minimum amplitude noise are demonstrated. Small gain nonlinearities improve external compression.
DOI
10.1364/ol.20.002018

Related papers

Semiclassical model of semiconductor laser noise and amplitude noise squeezing. I. Description and application to Fabry-Perot laser

J.-L. Vey, Philippe B. Gallion

A semiclassical model of semiconductor laser noise, based on the Green's function method, is used to derive analytical formulas for the amplitude and frequency noise spectra taking into account incoming vacuum fluctuations and noise due to internal loss. This formalism also takes into account phenomena such as gain suppression as well as spatial hole burning (SHB). The amplitude noise squeezing is studied for Fabry-Perot structures pointing out the influence of the laser structural parameters. A complete agreement with already existing quantum mechanical models is found. However, extension of the model to SHB induces limitations in the squeezing performances, which are very important for more complex structures as will be pointed out in detail, in Part II.

IEEE Journal of Quantum Electronics•Jan 1, 1997•20 citations

Semiclassical model of semiconductor laser noise and amplitude noise squeezing. II. Application to complex laser structures

J.-L. Vey, Philippe B. Gallion

For pt.I see ibid., vol.33, no.11, p.2097-2104 (1997). We present noise studies of distributed feedback (DFB) laser structures, where spatial hole burning (SHB) plays a key role performed using the model described in part I of this paper with particular emphasis on the influence of SHB, on the coupling coefficient /spl kappa/L, and on the laser facet reflectivities. These structures exhibit high amplitude noise and the possible noise reduction is strongly reduced compared to Fabry-Perot structures. Distributed Bragg reflector (DBR) lasers are better candidates even if their performances are also strictly determined by SHB and the loss in the Bragg reflector. Finally, limitations due to gain suppression are demonstrated for such complex lasers structures. We conclude on the optimum laser structure for amplitude squeezed states generation.

IEEE Journal of Quantum Electronics•Jan 1, 1997•10 citations

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Amplitude-squeezed states are produced from a room-temperature Fabry-P\'erot quantum-well semiconductor laser using a combination of pump suppression and weak, dispersive optical feedback. Up to 0.9 dB of squeezing is measured using a balanced homodyne detector corresponding to 1.5 dB of squeezing at the output facet of the laser. A comparison of the data to theoretical predictions suggests that the excess noise measured under free-running conditions could be a result of incomplete side-mode suppression in combination with asymmetrical cross-mode nonlinear gain saturation.

Physical Review Letters•Apr 24, 1995•50 citations

Semiconductor Laser with Dispersive Loss: Quantum Noises and Amplitude squeezing

Rashit F. Nabiev

In the recent paper 1 semiclassical treatment of semiconductor laser (SL) with dispersive loss element (DLE) inside the cavity was presented. In SL with frequency dependent photon life time τ p ( τ p −1=τp0−1+2Cφ, φ is the slowly varying phase of an electromagnetic field) phase and amplitude noises were shown to be decreased (1 + Cα)2 / (l +α2) and (1 + Cα)2 / (1 + C2) (α is the linewidth enhancement factor) times, respectively, comparing to the conventional SL (C=0). At the same time, he low frequency portion of current modulation response is unchanged. Possible values of parameter C 1 can be ~10 and some dozens in the case of atomic absorption cell and the weak coupling of SL to an external high-finesse Fabry-Perot etalon, respectively.

Quantum Optoelectronics•Jan 1, 1993•1 citation

Semiclassical description of noise and generation of amplitude squeezed states with vertical cavity surface-emitting semiconductor lasers

Jean-Luc C. Vey, Wolfgang Elsäßer

Theoretical investigations of the generation of light with sub-shot-noise intensity fluctuations by vertical cavity surface-emitting lasers are performed with a semiclassical model. From these results we conclude that, because of their dimensions and structure, vertical cavity surface-emitting lasers are promising candidates for generation of amplitude squeezed states. Finally, the influence of internal loss, distributed reflection coefficients, and gain suppression is emphasized and discussed.

Journal of the Optical Society of America B•Jun 1, 1997•11 citations
A semiclassical model of semiconductor laser noise, based on the Green's function method, is used to derive analytical formulas for the amplitude and frequency noise spectra taking into account incoming vacuum fluctuations and noise due to internal loss. This formalism also takes into account phenomena such as gain suppression as well as spatial hole burning (SHB). The amplitude noise squeezing is studied for Fabry-Perot structures pointing out the influence of the laser structural parameters. A complete agreement with already existing quantum mechanical models is found. However, extension of the model to SHB induces limitations in the squeezing performances, which are very important for more complex structures as will be pointed out in detail, in Part II.
For pt.I see ibid., vol.33, no.11, p.2097-2104 (1997). We present noise studies of distributed feedback (DFB) laser structures, where spatial hole burning (SHB) plays a key role performed using the model described in part I of this paper with particular emphasis on the influence of SHB, on the coupling coefficient /spl kappa/L, and on the laser facet reflectivities. These structures exhibit high amplitude noise and the possible noise reduction is strongly reduced compared to Fabry-Perot structures. Distributed Bragg reflector (DBR) lasers are better candidates even if their performances are also strictly determined by SHB and the loss in the Bragg reflector. Finally, limitations due to gain suppression are demonstrated for such complex lasers structures. We conclude on the optimum laser structure for amplitude squeezed states generation.
Amplitude-squeezed states are produced from a room-temperature Fabry-P\'erot quantum-well semiconductor laser using a combination of pump suppression and weak, dispersive optical feedback. Up to 0.9 dB of squeezing is measured using a balanced homodyne detector corresponding to 1.5 dB of squeezing at the output facet of the laser. A comparison of the data to theoretical predictions suggests that the excess noise measured under free-running conditions could be a result of incomplete side-mode suppression in combination with asymmetrical cross-mode nonlinear gain saturation.
In the recent paper 1 semiclassical treatment of semiconductor laser (SL) with dispersive loss element (DLE) inside the cavity was presented. In SL with frequency dependent photon life time τ p ( τ p −1=τp0−1+2Cφ, φ is the slowly varying phase of an electromagnetic field) phase and amplitude noises were shown to be decreased (1 + Cα)2 / (l +α2) and (1 + Cα)2 / (1 + C2) (α is the linewidth enhancement factor) times, respectively, comparing to the conventional SL (C=0). At the same time, he low frequency portion of current modulation response is unchanged. Possible values of parameter C 1 can be ~10 and some dozens in the case of atomic absorption cell and the weak coupling of SL to an external high-finesse Fabry-Perot etalon, respectively.