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Optics Letters

Amplitude-squeezed solitons from an asymmetric fiber interferometer

Dmitriy Krylov, K. Bergman

Published Sep 1, 1998• 66 citations
Publisher

Abstract

We experimentally demonstrate a new scheme for generating amplitude-squeezed solitons in an asymmetric fiber Sagnac loop. We measure by direct detection what is to our knowledge a record reduction of 5.7+/-0.1 dB (73%) and, with corrections for linear losses, 6.2+/-0.1 dB (76%) in the photon-number fluctuations below the shot-noise level. The same scheme is also shown to generate significant classical noise reduction and is limited by Raman effects in fiber.

DOI
10.1364/ol.23.001390

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We experimentally demonstrate a new scheme for generating amplitude-squeezed solitons in an asymmetric fiber Sagnac loop. We measure by direct detection what is to our knowledge a record reduction of 5.7+/-0.1 dB (73%) and, with corrections for linear losses, 6.2+/-0.1 dB (76%) in the photon-number fluctuations below the shot-noise level. The same scheme is also shown to generate significant classical noise reduction and is limited by Raman effects in fiber.
We experimentally demonstrate a new scheme for generating amplitude squeezed solitons in an asymmetric fiber Sagnac loop. We measure by direct detection a 5.7±0.1 dB (73%) and, with corrections for linear losses 6.2±0.1 dB (76%), reduction in the photon number fluctuations below the shot noise level. The same scheme is also shown to generate a significant classical noise reduction and is limited by Raman effects in fiber. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Direct photon-number squeezing is demonstrated, for the first time to our knowledge, in a nonlinear fiber-optic interferometer. Launching 126-fs solitons into a highly asymmetric Sagnac loop, the maximum photocurrent noise reduction was $3.9\ifmmode\pm\else\textpm\fi{}0.2\mathrm{dB}$ below shot noise, corresponding to $6.0\ifmmode\pm\else\textpm\fi{}0.9\mathrm{dB}$, when corrected for linear losses. The loop is a model system for squeezing generated by the interference of two pulses after nonlinear propagation through a fiber.
We experimentally demonstrate amplitude squeezed soliton utilizing intensity-dependent self-phase modulation in an asymmetric Sagnac interferometer. The system, whose components are connected via ferrule connector/physical connection (FC/PC) fiber connectors, constitutes all-fiber configuration to generate squeezed soliton. Soliton amplitude reduction measured by homodyne detection is near 4.0 dB below the shot-noise level. Optimal squeezing fields in both simple and compact all-fiber configuration are obtained.
Summary form only given. Several schemes to generate squeezed light by use of the Kerr nonlinearity in optical fibers have been devised. The most recent experiments used asymmetric Sagnac loops to produce amplitude squeezing. In our experiment the Sagnac geometry is "unfolded" into a Mach-Zehnder, wherein the two arms of the interferometer correspond to the polarization modes of a single-mode PM fiber. This setup allows us to switch from an asymmetric to a symmetric interferometer, and gives us full control of the phase and amplitude of the two interfering pulses. With these degrees of freedom, we are able to maximize noise reduction and perform a full measurement of the noise properties of the soliton squeezed pulses.
Optical soliton amplitude squeezed state caused by intensity correlation self-phase modulation effect was generated experimentally.The main part of experiment system was asymmetric Sagnac interferometer.Pulsed laser was connected to a coupler with splitting ratio of 90∶10 by PC/FC connector.The coupler and 40-meter photonic crystal fiber composed interference loop.At proper input power,optical soliton amplitude squeezed state could be observed at output terminal of the interferometer.Balanced homodyne detection system composed of 50/50 beam splitter,two low-noise photo detectors,adder/subtracter,and spectrum analyzer was used to detect the squeezed state.Intensity distribution curves of input and output of the Sagnac loop were drawn,and the signal noise curve using shot noise as reference was obtained.The compressibility was 1.6?dB.Analysis on experimental data shows that it's possible to improve compressibility further by choosing proper photonic crystal fiber.