OPTICAL AMPLIFIER NOISE-FIGURE IN A COHERENT OPTICAL-TRANSMISSION SYSTEM

被引：17

作者：

WALKER, GR ^{[1
]}

STEELE, RC ^{[1
]}

WALKER, NG ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,DEPT ENGN,CAMBRIDGE,ENGLAND

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 1990年 / 8卷 / 09期

关键词：

D O I：

10.1109/50.59172

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have investigated two important aspects of optical amplifier noise figure as measured with a heterodyne detection receiver. Firstly, differential mode gain will result in a polarization-dependent degradation of the perceived amplifier noise figure, even when the noise figures for the TE and TM modes of the amplifier are the same. For a differential mode gain of 7.5 dB the noise figure degradation can be as large as 3 dB, and we report experimental data in good agreement with theoretical predictions. Secondly, we report the first experimental demonstration of the use of image-rejection techniques to improve the sensitivity of a heterodyne receiver limited by beat noise between the local oscillator (LO) and amplified spontaneous emission (ASE). A simple optical filter was used to improve the sensitivity of an optically preamplified 622-Mb/s DPSK heterodyne receiver by 2.5 dB. © 1990 IEEE

引用

页码：1409 / 1413

页数：5

共 11 条

[1]

CHIKAMA T, 1989, P IOOC 89 KOBE, P48

[2] OPTICAL HETERODYNE IMAGE-REJECTION MIXER [J].