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Proceedings Paper

Design of highly flat-output gain equalizers
Author(s): Yu Zhou; Liren Liu; Juan Zhang; Changhe Zhou
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Paper Abstract

Birefringent filters in which several unequal-length birefringent crystal plates are located between two polarizing devices are used to flatten the gain spectrum of erbium-doped fiber amplifiers. The intensity transmission function of birefringent filter is a cosine series containing a finite number of terms. Because the desire intensity function can be transform into a cosine Fourier series which is truncated after an appropriate number of terms, the thickness and the relative rotation angles of each element can be acquired by comparing the intensity transmission function with the cosine expanding series of the desire function. Since the rotation angles of each element are easy to control, the desired function can be realized accurately. With this device, an amplifier can be given with <0.1dB gain variation in 1550nm-1562nm spectrum band. Furthermore, the use of a polarization beam-splitter and a polarization beam-combiner makes this device polarization-independent.

Paper Details

Date Published: 20 September 2002
PDF: 8 pages
Proc. SPIE 4927, Optical Design and Testing, (20 September 2002); doi: 10.1117/12.471431
Show Author Affiliations
Yu Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Liren Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Juan Zhang, Shanghai Institute of Optics and Fine Mechanics (China)
Changhe Zhou, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 4927:
Optical Design and Testing
Zhicheng Weng; Jose M. Sasian; Yongtian Wang, Editor(s)

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