Photon-number noise reduction from a nonlinear fiber-loop mirror

Schmitt, Stefan; König, Friedrich; Mikulla, B.; Spälter, S.; Sizmann, A.; Leuchs, Gerd

doi:10.1109/iqec.1998.680399

Technical Digest. Summaries of Papers Presented at the International Quantum Electronics Conference. Conference Edition. 1998 T

DOI: 10.1109/iqec.1998.680399

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Photon-number noise reduction from a nonlinear fiber-loop mirror

Stefan Schmitt

Friedrich König²,

B. Mikulla³

et al.

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“…7,8 The geometry proposed in Ref. 5 is well suited for testing this idea in practice and was recently explored experimentally by Schmitt et al 9 Different geometries for achieving amplitude squeezing, such as polarization interferometry, were also demonstrated recently. 10 In this Letter we experimentally demonstrate the asymmetric f iber Sagnac approach and report what is to our knowledge a record 5.7 6 0.1 dB (73%) directly detected photon-number squeezing below the shot-noise level.…”

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Amplitude-squeezed solitons from an asymmetric fiber interferometer

Krylov

Bergman

1998

Opt. Lett.

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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 6 0.1 dB (73%) and, with corrections for linear losses, 6.2 6 0.1 dB (76%) in the photon-number f luctuations 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. © 1998 Optical Society of America OCIS codes: 270.6570, 270.5530, 270.1670. Generation of amplitude-squeezed states by use of Kerr nonlinearity in optical fibers was recently demonstrated in a novel scheme pioneered by Friberg et al., who used soliton propagation followed by spectral f iltering. 1By launching a solitonlike pulse with energy slightly greater than the fundamental soliton energy ͑N . 1͒ into a fiber of length equivalent to several soliton periods followed by a spectral f ilter, it is possible to observe a reduction in photon-number f luctuations by direct detection. In subsequent experiments a reduction of as much as 3.8 dB was directly detected with femtosecond pulses. 2,3The f iltering action also introduces additional zero-point f luctuations into the system, limiting the highest achievable squeezing to approximately 8 dB below the shot-noise level for ideal fibers and bandpass filters. 4 Recently it was proposed that amplitude-squeezed pulses can be produced by interference between counterpropagating fields in an asymmetric fiber Sagnac loop. 5For the case of soliton squeezing the idea that interfering a high-energy ͑N . 1͒ soliton pulse with a weaker pulse or a dispersive wave can produce squeezing is also consistent with soliton perturbation treatment 6 as well as the general quantum theory of soliton propagation. 7,8 The geometry proposed in Ref. 5 is well suited for testing this idea in practice and was recently explored experimentally by Schmitt et al. 9Different geometries for achieving amplitude squeezing, such as polarization interferometry, were also demonstrated recently. 10In this Letter we experimentally demonstrate the asymmetric f iber Sagnac approach and report what is to our knowledge a record 5.7 6 0.1 dB (73%) directly detected photon-number squeezing below the shot-noise level. With correction for linear system losses, the actual amplitude squeezing is 6.2 6 0.1 dB (76%). We have also measured a significant reduction in the classical noise inherent in the optical signal.The experimental setup is shown in Fig. 1. A Spectra-Physics Opal optical parametric oscillator is used as a source of 182-fs (FWHM) sech-shaped optical pulses at a repetition rate of 82 MHz and centered at 1550 nm. The corresponding dispersion length ͑b 00 219 ps 2 ͞km͒ in the standard polarizationmaintaining (PM) fiber, Fujikura SM15-P-8 with an 8-mm core diameter, that was used in the experiments is ϳ54 cm, and the soliton period is 86 cm. The average power required for production of a fundamental ͑N 1͒ soliton, as determined by measurement of the ...

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confidence: 99%

Amplitude-squeezed solitons from an asymmetric fiber interferometer

Krylov

Bergman

1998

Opt. Lett.

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Photon-number noise reduction from a nonlinear fiber-loop mirror

Cited by 1 publication

References 2 publications

Amplitude-squeezed solitons from an asymmetric fiber interferometer

Amplitude-squeezed solitons from an asymmetric fiber interferometer

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