EXCESS-NOISE SUPPRESSION IN A FIBRE-OPTIC BALANCED HETERODYNE DETECTION SYSTEM.

被引：3

作者：

Stierlin, R. ^{[1
]}

Baettig, R. ^{[1
]}

Henchoz, P.-D. ^{[1
]}

Weber, H.P. ^{[1
]}

机构：

[1] Univ of Bern, Bern, Switz, Univ of Bern, Bern, Switz

来源：

Optical and Quantum Electronics | 1986年 / 18卷 / 06期

关键词：

INTERFEROMETERS - LASERS - Applications - VELOCIMETERS - Laser Doppler;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

An investigation was conducted of balanced heterodyne detection in applications where laser intensity fluctuations are the dominant noise source, as, for example, in laser Doppler velocimetry with a He-Ne laser. The suppression of excess noise in comparison with a single receiver detection system is analysed theoretically. In the authors heterodyne experiment they compared two different fibre-optic Mach-Zehnder interferometers, both with single-mode polarization-preserving fibres, one in integrated form using a directional coupler, the other one with a dielectric beam-splitter as the optical mixing element. With the former the authors verified the theoretical results; with the latter they have demonstrated that with a good balance the fundamental shot noise detection limit can be reached.

引用

页码：445 / 454