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Simultaneously oscillated 48-μm and 57-μm CH3OD lasers pumped by a 9R(8) CO2 laser have been developed for fusion plasma diagnostics. A back reflection from an optically pumped far-infrared (FIR) laser cavity affects not only the FIR laser stability but also the pump CO2 laser stability. The back reflection has been reduced by an optical isolator using a quarter-wave plate and an absorbing thin-film...
We propose and demonstrate a common public radio interface (CPRI)-compliant 25.2923-Gb/s mobile fronthaul network for long term evolution-advanced (LTE-A) systems. In order to meet the CPRI specifications and the stringent latency requirement of the LTE-A fronthaul network cost-effectively, we use the synchronous time-division-multiplexing, forward-error correction, and electrical equalization techniques...
Optical constants of 6H-SiC have been measured by using far infrared (FIR) lasers of 48, 57, 71, and 119 μm in wavelength. The refractive index and absorption coefficient at the wavelength have been determined from the transmittance of a rotating SiC etalon. For the application of the SiC to optical elements in the FIR region, it was compared with other materials (crystal quartz, high resistive silicon,...
Optical reflection tolerance is one of the key issues in optical subcarrier-multiplexed (SCM) RF video distribution systems. The broadening of the optical spectral width is a known technique to effectively mitigate optical reflection-induced deterioration. In this paper, we experimentally investigate the effectiveness of a laser current dithering technique, which induces the frequency chirp of an...
We experimentally investigate and demonstrate the effectiveness of the laser current dithering technique to mitigate the performance deterioration of analog video due to optical multiple reflections in the optical RF video distribution systems.
We investigated surface phonon polariton in cesium iodide with terahertz time-domain attenuated total reflection method. Systematic experiments with precise control of the distance between a prism and an active material directly indicate that the local electric Held at the interface considerably enhances with the surface phonon polariton resonance. This is ascribed to the extremely small damping constant...
We demonstrate terahertz time-domain attenuated total reflection spectroscopy of various organic powder samples, which is useful for convenient and repeatable characterization of the materials such as biomolecules.
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