We demonstrate what is to our knowledge the first all-fiber squeezing experiment. A balanced Sagnac loop is used, and a record 6.1±0.2dB of noise reduction below shot noise has been obtained without stabilization. A gigahertz Er-doped fiber laser and a high-power double-clad Er–Yb amplifier have been developed to suppress guided acoustic-wave Brillouin scattering and to make possible the all-fiber configuration.
© 2001 Optical Society of America
(270.0270) Quantum optics : Quantum optics
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(270.5290) Quantum optics : Photon statistics
(270.6570) Quantum optics : Squeezed states
C. X. Yu*, H. A. Haus, and E. P. Ippen, "Soliton squeezing at the gigahertz rate in a Sagnac loop," Opt. Lett. 26, 669-671 (2001)