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High-speed control of lightwave using electrooptic (EO) effect is investigated in this paper. Agile optical frequency shift can be achieved by optical single-sideband (SSB) and frequency-shift-keying (FSK) modulators, where high-speed optical phase-shift-keying (PSK) signals can also be generated by using FSK/SSB modulators. We also describe ultrahigh extinction ratio optical intensity modulation...
In this paper, we demonstrate an optical 2times2 switch having an extinction ratio of more than 42 dB over C- and L-band wavelengths by adopting Mach-Zehnder structures to balance optical powers at the two waveguides in the switch. In addition, we also demonstrate the possibility of ultrafast switching, by measurement of high-frequency response at the drop port of the switch when we apply 10-GHz voltage...
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