Simulation of Interferometer-Type Ultrafast All-Optical Gate Switches Based on Intersubband Transition in GaN/AlGaN Multiple Quantum Wells(Special Issue on Ultrafast Optical Signal Processing and Its Application)

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Although all-optical gate switches based on the intersubband absorption in nitride quantum wells are predicted to operate at 1 Tb/s, realization of strong intersubband absorption at the optical communication wavelength is still difficult. An alternative approach is an interferometer-type gate switch utilizing refractive index change due to the intersubband absorption of a control pulse at a longer wavelength. Feasibility of Mach-Zehnder interferometer (MZI) gate switches, in which 1.55-μm pulses are controlled by 1.85-μm pulses, was theoretically investigated by finite-difference time-domain (FDTD) simulator. Although the effective phase shift does not reach π, 22.5% of the signal pulse energy was predicted to be gated by a 10-pJ control pulse in the MZI switch. Even 1.3-μm pulses can be controlled by 1.85-μm pulses at the expense of the switching energy. This approach provides a way to process signal pulses at the optical communication wavelength utilizing strong intersubband absorption at a longer wavelength.
一般社団法人電子情報通信学会の論文
2002-01-01