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A technique to improve sensitivity of the CW photoacoustic spectroscopy has been developed and verified by measuring absorbance of water at different temperatures. The technique utilizes coupling between acoustic standing waves or acoustic resonant modes and the photoacoustic source distribution in the sample. By choosing proper acoustic resonant mode, the sensitivity can be enhanced approximately...
An 8-wavelength light source for silicon WDM transceiver was developed using an AlGaInAs DFB laser array integrated with tapered-SOA and precise flip-chip bonding technology. The device demonstrated high Si-waveguide-coupled output powers of >+2.3dBm/ch under 8-ch simultaneous operation at 70°C.
A modulator with an enhanced efficiency by cascaded microring resonators (MRRs), and a single-mode laser with a wavelength determined by a MRR wavelength filter were integrated on a Si chip to demonstrate for the first time wavelength-tuning-free 10-Gb/s modulation over a wide range of temperature.
Temperature-stable 10.3-Gb/s operation was attained for 1.3-μm quantum-dot DFB lasers with high modal gain. Clearly-opened eye diagrams with the extinction ratio of over 5.2 dB were obtained from -40°C to 80°C.
The production of pico-second vortex pulses from a stressed large mode-area fiber amplifier is presented, for the first time. 6.8 W pico-second output with peak power of ~10 kW was obtained at pump power of 29 W.
In this paper, we present the production of intense pico-second vortex pulses by selectively coupling a pico-second master laser into LP11 modes in a stressed large mode-area fiber amplifier with an off-axis fiber injection method, for the first time. In particular, this method is capable of directly producing amplified intense pico-second vortex pulses from a simple fiber amplifier without any phase...
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