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Authors: W. D'Oosterlinck, G. Morthier, R. Baets, M. Smit
Title: Very steep optical thresholding characteristic using a DFB laser diode and an SOA in an optical feedback scheme
Format: International Journal
Publication date: 3/2005
Journal/Conference/Book: Photonics Technology Letters
Editor/Publisher: IEEE, 
Volume(Issue): 17(3) p.642-644
Internal Reference: [N-386]
Download: Download this Publication (2MB) (2MB)

Abstract

A new optical decision or thresholding circuit,
composed of an SOA and a DFB laser diode in an optical
feedback scheme is proposed. This new circuit has been studied
both by simulations and experiments. Simulations show a very
steep optical decision characteristic that rises more then 5dB
over an input power range of less then 0.5dB. It is also
demonstrated that the decision point can easily be shifted by
tuning the drive currents of both the laser diode or the SOA or
the feedback ratio between them. The principle has been
experimentally verified as well, using a discrete SOA and DFB
laser diode. We showed a good agreement with the simulation
results. Again a very steep optical decision characteristic,
combined with the possibility to adjust the decision point was
obtained.

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