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Demonstrates the performance of latchable optical switch and logic gates. Integration of a vertical-cavity surface-emitting laser with heterojunction photothyristors; Achievement of excellent optical switching characteristics.

Analyzes the plasma-shifted distributed feedback laser with linearly chirped grating. Calculation of the field distribution, threshold gain difference between the lasing mode and the next lowest threshold gain mode and the linewidth of the lasing mode; Locking of the lasing mode pattern and the carrier concentration distribution at high injection level.