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Chinese Optics Letters

Soliton squeezing generated in an all-fiber configuration

Li Yu, 冯雪冬 Xuedong Feng, 尚旭东, 彭健 Jian Peng, 杨伯君 Bojun Yang

Published Jan 1, 2008• 0 citations
Publisher

Abstract

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.

DOI
10.3788/col20080602.0141

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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.
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.
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.
An all-fibre source of amplitude squeezed solitons utilizing the self-phase modulation in an asymmetric Sagnac interferometer is experimentally demonstrated. The asymmetry of the interferometer is passively controlled by an integrated fibre coupler, allowing for the optimization of the noise reduction. We have carefully studied the dependence of the amplitude noise on the asymmetry and the power launched into the Sagnac interferometer. Qualitatively, we find good agreement between the experimental results, a semi-classical theory and earlier numerical calculations (Schmitt et al 1998 Phys. Rev. Lett. 81 2446). The stability and flexibility of this all-fibre source makes it particularly well suited to applications in quantum information science.
An all-fibre source of amplitude squeezed solitons utilizing the self-phase modulation in an asymmetric Sagnac interferometer is experimentally demonstrated. The asymmetry of the interferometer is passively controlled by an integrated fibre coupler, allowing for the optimisation of the noise reduction. We have carefully studied the dependence of the amplitude noise on the asymmetry and the power launched into the Sagnac interferometer. Qualitatively, we find good agreement between the experimental results, a semi-classical theory and earlier numerical calculations [Schmitt etl.al., PRL Vol. 81, p.2446, (1998)]. The stability and flexibility of this all-fibre source makes it particularly well suited to applications in quantum information science.