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We devised a phase stabilization technique at optoelectronic carrier generation applicable for the future THz wireless coherent transmission. Based on a 1-Gbit/s data transmission with a 12.5-GHz carrier signal, we demonstrate for the first time that our technique using a Mach-Zehnder interferometric configuration is effective not only for on-off keying signals, but also for phase-shift keying signals.
We present a novel carrier-phase stabilization scheme for sub-THz communications. The scheme has a pseudo-Mach-Zehnder interferometric configuration in which two optical sidebands from an optical frequency comb travel along two different optical paths and then are coupled with each other. The interference between the optical frequencies generated from two sidebands are monitored and controlled to...
We investigated a coherent THz link at 200 GHz, with variable data rate up to 11 Gbit/s, featuring the combination of a quasi-optic UTC-PD emitter and a high sensitivity electronic receiver. This coherent link relies on an optical frequency comb generator at emission to produce an optical beat note with 200GHz separation. BER testing has been carried out using an indoor link configuration and the...
We report on Terahertz wireless communications and fast imaging experiments at 300 GHz, using nanometer-sized transistors as detectors. The physical mechanism of the detection is related to the overdamped plasma waves in the transistor channel.
Test chips with Si MOSFETs integrating bow tie antennas are investigated to check the polarization and frequency dependence of THz sensitivity. The azimuthal angle corresponding to the maximum sensitivity changes with the pixel position on the chip. This means that the surrounding pixels affect the bow tie radiation pattern and possibly contribute to the antenna coupling. The frequency dependence...
Electrooptic frequency shifters operating at higher modulation frequency will enhance the performance of current applications such as pulse characterization and optical sensing. Previously, we demonstrated frequency shifting of 16.25 GHz with the efficiency of 82% on the basis of Bragg diffraction from a sinusoidal electrooptic traveling-phase grating (ETPG). In this paper, we will demonstrate a new...
We demonstrate 2 ps temporal resolution of time-to-space mapping using double quasi-velocity-matched electrooptic deflectors operating at 16 GHz repetition frequency. Deflectors were fabricated on a single stoichiometric LiTaO3 substrate with ldquoUrdquo shaped modulation microstrip line.
We propose an electrooptic frequency shifter, which shifts the optical frequency by multiple of 10-GHz-order modulation frequency. The principle is based on successive Bragg diffraction from a multistage traveling phase grating produced by combination of slant periodic domain inversion and a collinear traveling modulation microwave. Numerical calculation has been presented.
We report an all optical streak camera using traveling-wave electro-optic sinusoidal deflector fabricated by use of simple domain-engineering processes in ferroelectric crystal. About 5 ps of the temporal resolution of our prototype system was demonstrated.
We propose a novel 10-GHz-order high-efficiency optical frequency shifter based on Bragg diffraction in an electrooptic traveling phase grating with slant periodic domain inversion. Frequency shifting was demonstrated at 16.25 GHz with conversion efficiency 70%.
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