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Reversible switching of an optical gate based on Si rib waveguides with a Ge2Sb2Te5 thin film is reported. We demonstrated four cycles of switching by pulsed laser irradiation. The average extinction ratios of each switching event were 9.1, 10.7, 11.6 and 11.7 dB, respectively. The extinction ratio of this optical gate was more than 5.9 dB over the wide wavelength range from 1525 nm to 1600 nm.
We review the research activities carried out during the past five years over OPS and OBS systems, that make a versatile use an innovative cost-effective multiport encoder/decoder to generate and process optical labels.
A compact Marx generator has been developed by using power MOSFETs as the switches. The objective is to develop repetitive, compact, efficient, short-pulse, high-voltage generator for industrial applications. The initial tests were carried out by using 16 switches, achieving output of ~ 10 kV and ~ 250 ns in pulse width at repetition rate of ~ 400 Hz.
High-power photo conductive semiconductor switches with a gap of 12 mm were fabricated from semi-insulating GaAs, in which carbon acceptor impurity was compensated by deep EL2 donor defect, resulting in very large dark resistivity. Triggered by laser pulse with different optical energy at wavelength of 1064 nm and 532 nm, photoconductivity tests of the PCSS at different bias voltage are underway....
Photoconductive semiconductor switches (PCSSs) are considered as promising device s for high power applications. Since picosecond optoelectronic switching in silicon was published in 1975, especially from 1977, in which Si was replaced by GaAs, PCSSs have been significantly used in pulsed power technology, such as high-power ultra wideband microwave source and compact pulsed power generator. Since...
The configuration of coupled ultra-small Mach-Zehnder all-optical switches is quite attractive for high-speed optical flip-flops. Its bistability is experimentally demonstrated with an emulated setup. High-speed capability corresponding to 10 and 40 Gb/s is confirmed with simulation based on rate equation analysis.
Nano-photonic technologies of GaAs-based two-dimensional photonic crystal (2DPC) slab waveguides and InAs-based quantum dots (QDs) are reviewed for a symmetric Mach-Zehnder type, ultra-small and ultra-fast all-optical switch (PC-SMZ) and new logic (PC-FF) device.
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