Abstract
We investigated a possibility to use an external micromechanical Fabry-Perot Interferometer, FPI, as a tuning component ina wavelength tunable hybrid laser diode. A silicon micromachined electrostatically tunable Fabry-Perot device was placed ina short distance to the front facet of a laser diode. Together with the front facet of the laser, the FPI formed an extremelyshort external cavity structure. This structure provided a spectrally adjustable optical feedback to the laser diode cavity. Inour experiment a 980-nm single-quantum-well high-power laser diode was used. The FPI device and the front facet of thelaser diode formed a 30-micron external cavity. As a result, a quasi-continuos tuning in a 4-nm wavelength range wasexperimentally observed. Theoretical work was done in modeling the effective feedback from the external cavity. Gaussianbeam approximation and field overlap methods were applied.Keywords: Tunable laser diode, short external cavity, optical feedback, micro-electro-mechanical systems
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