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All-optical switches based on Mach-Zehnder configuration with improved extinction ratios

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2 Author(s)
Besse, P.A. ; Swiss Federal Inst. of Technol., Lausanne, Switzerland ; Melchior, H.

We study driving conditions to improve the extinction ratios in 2/spl times/2 and 1/spl times/2 all-optical switches based on semiconductor optical amplifiers in Mach-Zehnder configuration. In 2/spl times/2 switches, the optimization of the relative phases of both arms of the interferometer together with the introduction of an optical push-pull lead to enhanced and symmetrical extinctions. In 1/spl times/2 switches, perfect extinctions can theoretically be obtained by adapting the splitting ratios of the input and output couplers to the saturation behavior of the amplifiers.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 1 )

Date of Publication:

Jan. 1997

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