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Authors: R. Laroy, G. Morthier, R. Baets
Title: Influence of gain on reflection spectra in widely tunable lasers
Format: International Workshop
Publication date: 9/2004
Journal/Conference/Book: European Semiconductor Laser Workshop 2004
Location: Särö, Gotheborg, Sweden
Internal Reference: [N-322]
Download: Download this Publication (7KB) (7KB)

Abstract

In widely tunable lasers a high side mode suppression and a large quasi-continuous tuning range can
only be obtained with a good grating design. In widely tunable twin-guide lasers, the reflectors and
the gain section overlap and this causes a different behavior for the reflectors as compared to passive
ones. E.g. using superstructure gratings for DBR lasers, we found that some modes were skipped and
no quasi-continuous tuning was obtained due to the influence of the gain on the reflection spectra of
the superstructure gratings. Using an optimization method, we have designed a superstructure grating
with a flat reflection spectrum even in the presence of gain, such that a good tuning behavior can be
guaranteed.

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