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Suppression of beat noise in low-coherence fiber interferometric system

Q. CHEN1,2,* , N. LU2, X. SANG1, F. JIANG2

Affiliation

  1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  2. Department of Electronic Information Engineering, Beijing Institute of Machinery, Beijing 100085, China

Abstract

To suppress the beat noise of a low-coherence fiber interferometric system, noise constitutes in the system is analyzed and an optical fiber filter is used in the experiment. Experimental result shows that, with a filter with FWHM of 4nm, the spectral mismatch between test arm and reference arm decreases from 49 nm to 4 nm, so the beat noise in the recorded interferogram is significantly suppressed and the visibility is also noticeably improved..

Keywords

Beat noise, Low-coherence interference, Fiber filter.

Submitted at: May 15, 2007
Accepted at: Aug. 18, 2007

Citation

Q. CHEN, N. LU, X. SANG, F. JIANG, Suppression of beat noise in low-coherence fiber interferometric system, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 8, pp. 2367-2370 (2007)