Abstract

The semiconductor directional coupler optical modulator/switch in vertical coupled-waveguide configuration [1] is one of useful components in integrated and guided-wave optics because of the less difficult fabrication process and small size. In recent years these devices with multiple quantum wells (MQW) were reported[2]-[5], where the large change in refractive index due to the quantum confined Stark effect(QCSE) were employed for reduction of the switching voltageVs and the device length l. In this paper we report on a new device with very small Vs of 5V and l of 138µm.

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