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The W-band signal near the antenna surface is detected using a THz probing system, by assuming near/far electric field distribution measurement on a phased array antenna coupled to an RoF radar system. By using 10 GHz + 12.5 kHz optical sampling pulse with a ZnTe EO probing head, the 80-GHz signal generated by a UTC-PD could be successfully detected as a down-converted signal of 100 kHz. It suggests...
In this paper, the optical pulse response of 20 layer-stacked QD-SOAs grown on an InP(311)B substrate with the strain compensation technique by using picosecond pulses of an optical frequency comb was determined. It was found the QD-SOA could respond to ultrafast pulses with a minimum pulse interval of 4.2 ps without large pattern distortions.
We fabricated the QD-SOA, which was composed of 20-layer-stacked InAs quantum dots structure with the strain-compensation technique grown by MBE, and evaluated the fundamental gain characteristics and ultra-fast optical pulse response for all-optical logic gate devices at a wavelength range around 1550nm. For the device length of 1650 μm, the maximum gain of 34.7 dB was obtained for TE mode. And we...
We demonstrate the coherent transfer and on-demand retrieval of quantum state of telecom-wavelength ultrabroadband single photon pulse (terahertz range) to a collective excitation of a large number of quantum dots using photon-echo technique. The large inhomogeneous broadening of exciton energies in quantum dots, in conjunction with photon-echo technique, enables us to increase the acceptable spectral...
The generation of ps-order-short and gigahertz high-repetition optical pulses in the ultra-wideband wavelength tuning range on a 1.2- to 1.3-μm band was successfully demonstrated using a hybrid mode-locked quantum dot optical frequency comb laser.
We propose an all-optical switch based on selfassembled InAs/GaAs quantum dots (QDs) within a vertical cavity. Two essential aspects of this novel device have been investigated, which includes the QD/cavity nonlinearity with appropriately designed mirrors and the intersubband carrier dynamics inside QDs. Vertical-reflection-type switches have been fabricated with an asymmetric cavity that consists...
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