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Laser-diode wavelength tuning based on butt coupling into an optical fiber

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Abstract

An extremely short external cavity that is realized when a Fabry–Perot laser diode is butt coupled to a waveguide or a fiber produces feedback that is effective for controlled wavelength tuning. We used butt coupling to tune a high-output-power laser diode over a wide range (as great as 15 nm) while maintaining constant driving current and temperature. Single-mode or multimode operation repeatedly occurred at specific points throughout the tuning range. An analytical model that includes the effect of multiple reflections from the external cavity, each attenuated by a modal overlap integral, and which is based on phenomenological principles, shows good agreement with the experimental results.

© 1997 Optical Society of America

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Diode-laser-to-waveguide butt coupling: extremely short external cavity

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