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We have demonstrated generation of a highly accurate THz continuous wave based on a fs-pulse fiber comb. Applying ultra-narrow optical filtering based on stimulated Brillouin scattering to the fs fiber comb having a repetition rate of 100MHz enables extraction of only two optical modes of the fs fiber laser to generate a highly stable 100GHz wave.
This paper describes a process-scalable transmitter based on inverter topology excluding un-scalable RF inductors. The proposed transmitter was fabricated by using 90nm and 65nm Si CMOS process. The following results are obtained from the comparison between 90nm and 65nm of the measurement results. The area of the core circuits reduces from 0.0081mm2 to 0.0054mm2. The operational frequency improves...
Developments of smart grids and integration of renewable energy sources will increase the amount of switching operations of unloaded transformer systems. A random energization of an unloaded power transformer can cause inrush currents and related voltage disturbances. State of the art controller systems control these phenomena taking into account the residual flux after a transformer de-energization,...
THz-wave is a viable tool for water content measurement due to its highly sensitivity to water. We analyzed the measurement errors of water volume concentration. The chosen basis for sample thickness and measuring frequency were presented theoretically. Measurements of water mapping and concentration in different tissues were experimentally investigated using THz-wave parametric source.
We investigated the waveforms of a pico-second pulse signal propagating through a coplanar waveguide fabricated on an InP substrate. Although the pulse profile was asymmetrically modified and the bandwidth was degraded as the pulse propagated, higher frequency Fourier components remained considerably. This demonstrates the waveguide integrated UTC-PD's potential as a THz-TDS device operating at 1...
An automatic phase matching technology, integrated with an angle-tuning mirror and a telescope, was designed for a surface emitted terahertz-wave (THz) parametric oscillator and a THz-wave detection unit using parametric up-conversion in MgO:LiNbO3. A monochromatic, wide tunable THz-wave generation and detection system working at room temperature was demonstrated. The system offers a dynamic range...
We developed an optical frequency standard using 40Ca+ with the 4 2S1/2-3 2D5/2 electric quadrupole transition. Its absolute transition frequency is 411 042 129 776 390(7) Hz. The uncertainty is limited by the electric quadrupole shift and ambient magnetic field fluctuation. To determine the absolute transition frequency with a better uncertainty, we have observed two pairs of the symmetrically-splitting...
We have demonstrated that a superconductor-insulator-superconductor (SIS) mixer pumped by a photonic local oscillator (LO) covers the whole frequency range of 0.2-0.5 THz. In the bandwidth of 74 % of the center frequency, this single-band receiver exhibits the noise temperature of TRXles20hf/kB, where h is Planckpsilas constant, f the frequency, and kB Boltzmann constant. Resultant TRX is almost equal...
We have developed a 1 GHz synthesis chain based on a cryogenic sapphire oscillator. The 11.2005 GHz output of the CSO is down-converted for laboratory distribution. The frequency stability of the down-converter itself is 2times10-15 at an averaging time of 1 second. The long-term drift of the CSO is suppressed by referencing it to a hydrogen maser linked to Japan Standard Time. An application of this...
This paper presents a feasibility study on VCO using RF SiP technology, which is an RF application of stacked SiP. An off-chip inductor is implemented in a separated chip, and measured Q factor is 130. A phase noise is -119 dBc/Hz at 1 MHz offset for a 5.84-GHz carrier frequency, and frequency tuning range is 5.73 GHz-5.95 GHz. Power consumption is 1.93 mW, and 180 nm CMOS process is utilized. FOM...
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