| 摘要 |
PURPOSE:To integrate numerous optical switches on one substrate, by constituting at least one of three channel waveguides in a gain guiding type waveguide which utilizes the gain difference between a section, into which carrier injection is performed, and non-injected section when partial carrier injection is performed into an active layer of a semiconductor material. CONSTITUTION:In a waveguide constitution of a gain guiding type which is constituted by closely arranging plural, for example, three channel waveguides having the same phase constant in parallel with each other at regular intervals, three channel waveguides 20a, 20b, and 20c are formed just below the (p) regions 9a, 9b, and 9c of an active layer 5 by the distribution of gains in the active layer 5, when forward bias is added between electrodes 11a, 11b, and 11c and an electrode 10 and the electrodes are biased to the vicinity of a threshold. That is to say, when electric current injection is performed into the electrodes 11a, 11b, and 11c, an 1-input and 3-output optical switch of the three channel waveguides is obtained.
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