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We demonstrate direct-coupling of vertical-cavity surface-emitting lasers to suspended-core PCFs and present characterization of this gas sensor. The spectral background and power-overlap from 763-2004 nm are measured to determine the quantitative detection sensitivity.
The first VCSEL-based O2 sensor for gas/oil furnace applications employing a diffuse reflector is presented which circumvents alignment and interference problems. Optimized data processing is used for long-term stable operation and allows for real-time measurement.
A novel compact sensor approach utilizing the wide current tunability of VCSELs and employing reference gas in the photodetector is tested under diverse standard conditions for fire detection.
A tunable photonic microwave filter using slow light in a VCSEL is proposed and experimentally demonstrated for the first time. Tunable microwave notch filter at 20 GHz can be achieved by adjusting the bias current of VCSEL.
A simple theoretical model is used to derive closed form expressions for the FM response of VCSELs. These match measurement results very well and give a significant improvement over the usually assumed first order model.
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