Studies on generation and characterization of quadrature squeezed light with fiber loop mirror

Masaki Hashirua, Norihiko Nishizawa, Masakazu Mori +1 more

M. Mori, Norihiko Nishizawa, Toshio Goto

Norihiko Nishizawa, Masakazu Mori, Toshio Goto +1 more

Norihiko Nishizawa, Masaki Hashiura Masaki Hashiura, Takeo Horio Takeo Horio +3 more

Squeezed light generation is demonstrated using a new scheme of nonlinear fiber loop mirror. The squeezed light can be generated stably in a compact setup and the phase difference can be changed arbitrarily. Using a 100 ps mode-locked pulse laser at 1.064 µm and 0.85 µm single-mode fiber, the quantum noise reduction of 2.0 dB below the shot noise level is observed in the frequency range of 25–35 MHz. Accounting for the detection efficiency, this corresponds to 2.9 dB squeezing.

Daniel F. Walls, Gerard J Milburn

Junichi Higuchi, Norihiko Nishizawa, Masakazu Mori +2 more

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.