Open AccessPhoton-number squeezing with a noisy femtosecond fiber laser amplifier source using a collinear balanced detection technique
Author(s) -
Shota Sawai,
Hikaru Kawauchi,
Kenichi Hirosawa,
Fumihiko Kannari
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.025099
Subject(s) - optics , physics , optical amplifier , femtosecond , photon , amplifier , shot noise , amplified spontaneous emission , optical fiber , noise (video) , relative intensity noise , laser , optoelectronics , detector , semiconductor laser theory , computer science , cmos , artificial intelligence , image (mathematics)
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.