title: Raman-Enhanced Phase-Sensitive Fibre Optical Parametric Amplifier.
abstract: Phase-sensitive amplification is of great research interest owing to its potential in noiseless amplification. One key feature in a phase-sensitive amplifier is the gain extinction ratio defined as the ratio of the maximum to the minimum gains. It quantifies the capability of the amplifier in performing low-noise amplification for high phase-sensitive gain. Considering a phase-sensitive fibre optical parametric amplifier for linear amplification, the gain extinction ratio increases with the phase-insensitive parametric gain achieved from the same pump. In this work, we use backward Raman amplification to increase the phase-insensitive parametric gain, which in turn improves the phase-sensitive operation. Using a 955 mW Raman pump, the gain extinction ratio is increased by 9.2 dB. The improvement in the maximum phase-sensitive gain is 18.7 dB. This scheme can significantly boost the performance of phase-sensitive amplification in a spectral range where the parametric pump is not sufficiently strong but broadband Raman amplification is available.
authors.affiliation: Department of Electronic Engineering and Center for Advanced Research in Photonics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong.
authors.forename: Xuelei
authors.initials: X
authors.lastname: Fu
authors.affiliation: Department of Electronic Engineering and Center for Advanced Research in Photonics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Guo
authors.affiliation: Department of Electronic Engineering and Center for Advanced Research in Photonics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong.
authors.forename: Chester
authors.initials: C
authors.lastname: Shu
references.citation: Opt Express. 2013 May 20;21(10):12077-84
references.pmid: 23736428
references.citation: Opt Express. 2013 Apr 8;21(7):7926-33
references.pmid: 23571884
references.citation: Phys Rev B Condens Matter. 1985 Apr 15;31(8):5244-5252
references.pmid: 9936486
references.citation: Opt Express. 2004 Oct 4;12(20):4973-9
references.pmid: 19484051
references.citation: Opt Express. 2015 Jan 26;23(2):902-11
references.pmid: 25835850
references.citation: Opt Express. 2014 May 5;22(9):10477-86
references.pmid: 24921749
references.citation: Opt Express. 2013 Nov 18;21(23):28743-50
references.pmid: 24514386
references.citation: Opt Lett. 2013 Nov 1;38(21):4405-8
references.pmid: 24177105
references.citation: Opt Express. 2006 Mar 20;14(6):2085-94
references.pmid: 19503540