Phase sensitive amplification with noise figure below the 3 dB quantum limit using CW pumped PPLN waveguide

被引：49

作者：

Asobe, Masaki ^{[1
]}

Umeki, Takeshi ^{[1
]}

Tadanaga, Osamu ^{[1
]}

机构：

[1] NTT Corp, NTT Photon Labs, Atsugi, Kanagawa 2430198, Japan

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 12期

关键词：

AMPLIFIER; FIBER;

D O I：

10.1364/OE.20.013164

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The noise figure (NF) of a phase sensitive amplifier (PSA) based on a periodically poled LiNbO3 (PPLN) waveguide was evaluated in the optical and electrical domains. Phase sensitive amplification was realized using degenerate parametric amplification in the PPLN waveguide, which was pumped by the second harmonic frequency of the signal. Second harmonic pumping enables direct observation of the intrinsic amplified spontaneous emission (ASE), which determined the NF of the PSA. An NF below the 3 dB quantum limit was obtained by observing the intrinsic ASE. The low NF was also confirmed via the noise floor measurement of a cascaded PSA and erbium doped fiber amplifier in the electrical domain. The PSA was used as a preamplifier for detecting a 40 Gbit/s phase shift keying signal. The low noise characteristics were confirmed by the improved sensitivity. (C) 2012 Optical Society of America

引用

页码：13164 / 13172

页数：9

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