Abstract

Due to the versatile functions and the potential ability of monolithic integration, semiconductor ring laser (SRL) has received increasing attention recently in the application of all-optical logic unit. In this paper, InP/AlGaInAs multiple quantum well (MQW) ring lasers with different cavity structures were designed and fabricated using the optimized process parameters. The measurement results shown that the fabricated microring lasers have a wide bistability operation regime, and are suitable for the all-optical logic gate and the optical random storage memory. Based on the optical bistability and the injection locking of ring laser, Boolean function AB  was demonstrated by using one of the monolithic integrated ring lasers, and an all- optical XOR gate can be obtained by two completely symmetrical SRLs integrated on one chip.

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