期刊
OPTICS EXPRESS
卷 16, 期 6, 页码 3896-3911出版社
Optica Publishing Group
DOI: 10.1364/OE.16.003896
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A new semiconductor laser structure with digitally switchable wavelength is proposed. The device comprises two coupled c. avities with different optical path lengths, which form V-shaped branches with a reflective 2x2 half-wave optical coupler at the closed end. The reflective 2x2 coupler is designed to have a pi-phase difference between crosscoupling and self-coupling so as to produce synchronous power transfer functions. High single-mode selectivity is achieved by optimizing the coupling coefficient. The switchable wavelength range is greatly increased by using Vernier effect. Using deep-etched trenches as partial reflectors, additional waveguide branch structures are used outside the laser cavities to form a complete Mach-Zehnder interferometer, allowing space switching, variable attenuation, or high speed modulation to be realized simultaneously. Detailed design principle and numerical results are presented. (C) 2008 Optical Society of America.
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