Laser frequency-fluctuation measurement employing an optical-fiber circulation loop

Author

Ishida, Osamu

Author_Institution

NTT Transmission Syst. Lab., Kanagawa, Japan

Volume

4

Issue

11

fYear

1992

Firstpage

1304

Lastpage

1307

Abstract

An optical circulation loop acting as a long fiber delay-line is used in a delayed-self-heterodyne setup for laser frequency-fluctuation measurement. Two-sample variance estimation at the averaging time up to 1 ms (corresponding to an equivalent delay-fiber length of 810 km) is demonstrated with the loop, which includes an acoustooptic modulator, 27-km delay fiber, and an erbium-doped fiber amplifier. A signal-to-noise-ratio (S/N) analysis shows that the amplified spontaneous emission (ASE) that accumulates in the loop degrades the S/N by the factor of 1/j/sup 2/, where j denotes the loop round-trip number.<>

Keywords

delay lines; frequency measurement; laser variables measurement; optical fibres; superradiance; 27 km; 810 km; ASE; Er doped fiber amplifier; acoustooptic modulator; amplified spontaneous emission; delayed-self-heterodyne setup; laser frequency-fluctuation measurement; long fiber delay-line; loop round-trip number; optical-fiber circulation loop; signal-to-noise-ratio; two sample variance estimation; Degradation; Delay effects; Delay estimation; Erbium-doped fiber amplifier; Erbium-doped fiber lasers; Frequency measurement; Optical modulation; Signal analysis; Signal to noise ratio; Spontaneous emission;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.166977

Filename

166977