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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Analysis of photon-number squeezed light generation using nonlinear polarization interferometer

Junichi Higuchi, Norihiko Nishizawa, Toshio Goto, M. Mori, Kazuo Yamane

Published Nov 13, 2002• 0 citations
Publisher

Abstract

We propose new scheme of photon-number squeezed light generation using nonlinear polarization interferometer, in which photon-number squeezed light can be generated only passing through optical fiber. Maximum squeezing is estimated to be about -13 dB.
DOI
10.1109/cleopr.2001.971015

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We propose a new scheme of photon-number squeezed light generation using a nonlinear polarization interferometer which is constructed by the cascade connection of two polarization-maintaining fibers. Since it is possible to generate photon-number squeezed light by only passing an optical pulse through an optical fiber without spatial alignment, it is expected that the squeezed light can easily and stably be generated in this scheme. The magnitude of maximum squeezing in the numerical analysis is estimated to be about -13 dB. Since the arbitrary dividing ratio and two outputs can be obtained by merely turning the half-wave plates on the input and output side, photon-number squeezed light can be generated for the broad input and output power ranges.
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We analyze numerically the generation of photon-number squeezed light using an asymmetric fiber loop mirror. For photon-number squeezed light generation, the maximum squeezing can be obtained using this method. The evolution of the quantum noise for the optical pulse spectra is calculated using the quantized nonlinear Schrödinger equation and linearization approximation. It is shown that the squeezed light is generated by removing the increased quantum noise part of the spectrum and enhancing the decreased quantum noise part of the spectrum, by the interference of two pulses at the beam splitter. Although the mechanism of squeezing is similar to that of a spectral filter, the maximum squeezing is as large as -13 dB due to the interference.
We demonstrate the generation of squeezed vacuum using a wavelength-tunable soliton pulse and nonlinear polarization interferometer (NOPI). Since the soliton pulse is ideal for squeezed vacuum generation and the wavelength of the soliton pulse can be tuned easily, it is expected that we can demonstrate large squeezing over a wide wavelength range. Using NOPI, since it is possible to generate squeezed light by only passing the optical pulse through the optical fiber without spatial alignment, the squeezed light can be generated easily and stably. A maximum noise reduction of -2.46 dB below shot noise level was observed. Considering the effect of quantum efficiency, the corresponding magnitude of squeezing is estimated to be -4.22 dB. The squeezing was observed when the center wavelengths were 1625 nm and 1650 nm.
Squeezed vacuum generation is demonstrated using an ultrashort pulse fiber laser and a symmetric nonlinear polarization interferometer (NOPI). In this system, the squeezed vacuum can be generated only by passing the ultrashort pulse along the optical fiber. Noise reduction of -1.7 dB below shot noise level is observed. Considering the effect of quantum efficiency in this system, the corresponding magnitude of squeezing is estimated to be -2.7 dB. The system is constructed with all fiber devices and is compact, stable, and useful for practical applications.