Nano-structured special quantum well for high-performance optical modulators

Taro Arakawa; Kunio Tada

doi:10.1117/12.754535

26 November 2007 Nano-structured special quantum well for high-performance optical modulators

Taro Arakawa, Kunio Tada

Proceedings Volume 6782, Optoelectronic Materials and Devices II; 67820W (2007) https://doi.org/10.1117/12.754535
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

A five-layer asymmetric coupled quantum well (FACQW) is a novel potential-tailored quantum well that is expected to exhibit giant electrorefractive (ER) index change in a transparency wavelength region. We studied the GaAs/AlGaAs and InGaAs/InAlAs FACQW theoretically and experimentally. A GaAs/AlGaAs FACQW was grown by molecular beam epitaxy (MBE). Giant ER sensitivity |dn/dF| as large as 1.7 × 10^-4 cm/kV was observed in the FACQW phase modulator. A Mach-Zehnder (MZ) FACQW modulator was fabricated and the operation voltage was successfully decreased. For 1.55 μm wavelength region, an InGaAs/InAlAs FACQWs was also proposed and studied. We found that the InGaAs/InAlAs FACQW is also expected to produce a giant ER sensitivity |dn/dF|. The InGaAs/InAlAs multiple FACQW was successfully grown by MBE and the results of its photoabsorption current measurements are consistent with the theory. We proposed an MZ modulator and a 2 × 2 switch with the multi-FACQWs in the core. Driving voltages of the FACQW modulator and the switch with 1mm-long phase shifters can be decreased as low as 0.1~0.2 V.

Citation Download Citation

Taro Arakawa and Kunio Tada "Nano-structured special quantum well for high-performance optical modulators", Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67820W (26 November 2007); https://doi.org/10.1117/12.754535

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