title: Photon-number squeezing with a noisy femtosecond fiber laser amplifier source using a collinear balanced detection technique.
abstract: We experimentally demonstrate photon-number squeezing at 1.55 μm using a noisy erbium-doped fiber amplifier (EDFA). We employ a collinear balanced detection (CBD) technique, where the intensity noise at a specific radio frequency is canceled between two pulse trains. In spite of substantially large excess noise (>10 dB) in an EDFA due to amplified spontaneous emission, we successfully cancel the intensity noise and achieve a shot noise limit at a specific radio frequency with the CBD technique. We exploit two sets of fiber polarization interferometers to generate squeezed light and observe a maximal photon-number squeezing of -2.6 dB.
authors.forename: Shota
authors.initials: S
authors.lastname: Sawai
authors.forename: Hikaru
authors.initials: H
authors.lastname: Kawauchi
authors.forename: Kenichi
authors.initials: K
authors.lastname: Hirosawa
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Kannari