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Design of a monolithic tunable laser based on equivalent-chirp grating reflectors

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Abstract

A Vernier-tuned distributed Bragg reflector (DBR) semiconductor laser is an effective monolithic approach for wide wavelength tunability, at the expense, however, of costly electron-beam lithography during fabrication. In this Letter, a tunable laser design with equivalent-chirp based, flat-top envelope grating reflectors is proposed that can be implemented easily by conventional two-beam interference lithography. The principle is described, and a detailed design shows uniform output power (0.08dB variation) and excellent side-mode suppression ratio (47dB minimum) within a wide tuning range (>32nm) through numerical simulation.

© 2010 Optical Society of America

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