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The method of separating two or more wideband signals that arrive from close angles is proposed. Its high-resolution capability of direction of arrival estimation is based on extracting narrowband components from the wideband signals in the frequency domain. Then, the resolution is stepwise improved by changing the target frequency band upward. By this process, we can avoid the effect of grating lobes...
An InGaAsP single-mode laser diode (LD) highly tolerant to optical feedback was realized utilizing a partially corrugated grating with a window-mirror structure. The length and the coupling coefficient of the grating were properly chosen to enable moderate output power, low feedback sensitivity, and a side mode suppression ratio of 40 dB simultaneously. Under -16 dB external optical feedback, the...
A 1490 nm InGaAsP single-mode laser diode, with high endurance against external optical feedback, was realized utilizing an optimized partially corrugated grating and a window-mirror-structure. The gratingpsilas length and the coupling coefficient were designed to enable moderate output power, low feedback sensitivity and a SMSR of 40 dB simultaneously. The relative intensity noise (RIN) was maintained...
We observed and characterized broadband terahertz emission from our original plasmon-resonant emitter structured by dual-grating gate high electron mobility transistors (HEMT's). The samples are fabricated in two structures: a standard single-heterostructure HEMT with metallic grating gates and a double-decked (DD) HEMT with semiconducting 2-dimensional electron gas (2DEG) grating gates. The mechanism...
A 30 nm tunable laser diode utilizing front SG-DBR and rear SSG-DBR was demonstrated for the first time. High output power over 45 mW as well as good wavelength control was achieved with SMSR greater than 40 dB.
We propose a new design of an ultra-high frequency pulsation laser, taking advantage of a phase shift effect. Injection locking function at 168 GHz and 210 GHz using sub-harmonic optical clock signals was experimentally verified for the first time.
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