| 摘要 |
PURPOSE:To offer a light branching semiconductor laser with many functions applying a semiconductor laser, by combining a circular light waveguide and a linear light waveguide. CONSTITUTION:A basic constitution is one in which four linear light waveguides 104 are made to contact with a circular light waveguide 103. In this case, four kinds of resonator combination are possible for a semiconductor laser 102, that is, two kinds of resonator formed only by the respective linear waveguides 104, and the two kinds of resonator formed by a combination of half of the circular light waveguide 103 and the two linear waveguides 104. In order to operate independently these resonators, an N-type clad layer is eliminated in the vicinity of connecting parts of each light waveguide in the manner in which independent carrier injection into each light waveguide is possible. By controlling in this manner the density of carrier injection into a divided N-side electrode 114, a light signal can be branched in one or both directions out of two directions in a state wherein the light signal coming from outward is amplified and its waveform is shaped.
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