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Gain recovery in semiconductor optical amplifiers

Li, X and Adams, MJ and Alexandropoulos, D and Lealman, IF (2008) 'Gain recovery in semiconductor optical amplifiers.' Optics Communications, 281 (13). 3466 - 3470. ISSN 0030-4018

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Abstract

Pump-probe measurements are presented of gain compression and recovery in a series of four semiconductor optical amplifiers of different lengths but otherwise identical structures. A continuous wave probe beam from a tunable laser is used to measure the wavelength dependence of gain compression and recovery times. A good level of agreement is obtained when these results are compared with numerical simulations using a model that includes the material gain spectrum, saturation effects and the variation of optical intensities with longitudinal position in the device. In addition the experimental results are interpreted in terms of a recent theory that offers approximate analytic expressions connecting recovery time with transmission gain. The spectral dependence of the recovery time and the gain are used to verify the correlations between these quantities and their dependence on device length. The results for recovery time show a strong dependence on probe wavelength with a pronounced minimum which is coincident with the peak of the gain spectrum for each device. A rather weak correlation of speed with length is found. © 2008 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science and Health > Computer Science and Electronic Engineering, School of
Depositing User: Jim Jamieson
Date Deposited: 05 Mar 2012 14:30
Last Modified: 17 Aug 2017 18:13
URI: http://repository.essex.ac.uk/id/eprint/2185

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