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Proceedings Paper

Coherence optimization of vertical-cavity semiconductor optical amplifiers
Author(s): Michael Sanchez; Pengyue Wen; Matthias Gross; Osman Kibar; Sadik C. Esener
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Paper Abstract

Vertical cavity semiconductor optical amplifiers (VCSOAs) are attractive devices for use in coherent optical amplification, especially where 2-D amplifier arrays are required. However, the coherence preservation quality of a VCSOA depends strongly on the bias condition, resonant wavelength mismatch, and the optical input power level. We characterize the coherence degree of a VCSOA as a function of these parameters by measuring interference fringe visibility with an interferometer. The dominant factors influencing the contrast of the fringes are the ratio of coherent, stimulated emission photons to amplified spontaneous emission (ASE) photons, and the spectral distortion of the amplified signal. Mostly, the overall gain and the saturation characteristic of the amplifier determine the ratio of stimulated emission to ASE. The spectral distortion of the signal is due to the narrow gain window of the VCSOA, but the effect significantly degrades the visibility only for relatively large wavelength mismatch from the gain peak. Analytic expressions may be used to identify the optimal bias current and optical input power to maximize the amplifier gain and visibility of the interference.

Paper Details

Date Published: 4 June 2002
PDF: 10 pages
Proc. SPIE 4649, Vertical-Cavity Surface-Emitting Lasers VI, (4 June 2002); doi: 10.1117/12.469222
Show Author Affiliations
Michael Sanchez, Univ. of California/San Diego (United States)
Pengyue Wen, Univ. of California/San Diego (United States)
Matthias Gross, Univ. of California/San Diego (United States)
Osman Kibar, Univ. of California/San Diego (United States)
Sadik C. Esener, Univ. of California/San Diego (United States)

Published in SPIE Proceedings Vol. 4649:
Vertical-Cavity Surface-Emitting Lasers VI
Chun Lei; Sean P. Kilcoyne, Editor(s)

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