Integrated wavelength monitoring in a photonic-crystal tunable laser diode |
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Institution: | 1. Department of Physics, Microstructure Laboratory, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany;2. Photon Design, OX4 1TW Oxford, UK;3. Laboratoire Charles Fabry de l’Institut d’Optique, CNRS, Univ Paris-Sud, Campus Polytechnique, RD 128, F-91127 Palaiseau, France |
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Abstract: | A photonic-crystal tunable 1.55 μm laser diode is fitted with a wavelength monitor on its rear side. The 250-μm long laser based on a coupled-cavity design has approximately 15 nm tunability. The wavelength monitor collects and differentially feeds two-photodetecting areas, thanks to a mode conversion to a higher-order mode (a mini-stopband), followed by tunneling through a thin clad. The layout is numerically optimized to minimize unwanted reflections. Electrical cross-talk was prevented through guard rings and trenches. The correlation between wavelength and the monitor photocurrent ratio demonstrates a 10–20 GHz stabilization capability, or a 15 nm monitoring range. |
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