Abstract
A Ga0.8In0.2As/GaAs thermally actuated optical switch has been demonstrated for unpolarized 1.08 μm light. Its measured on:off contrast ratio of 4.7 was produced electrically by changing the applied voltage from 0 to 3.2 V on a device with a 2.25-μm-thick Ga0.8In0.2As active layer. The ‘‘on’’ insertion loss was 3.8 dB. The on:off change in Ga0.8In0.2As absorption coefficient was 6660 cm−1. The switching current density was 9.7 A/cm2. The thermal switching energy can be supplied optically for an all-optical switch.
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