| 摘要 |
PURPOSE: A planar lightwave circuit is provided to control respective waveguide characteristics independently. CONSTITUTION: A lightwave(102) transmits light to a planar lightwave circuit board(101). The first star coupler(104) scatters and outputs the light incident through an input portion(LI1). A resistor heater(106) heats the lightwave(102) to adjust a temperature. A heater controller(108) controls the resistor heater(106). The second star coupler(105) couples and outputs lights transmitted through the lightwave(102). An optical tap(110) selects a part of an output light of an output portion(LO1) and feeds the selected light back to the lightwave(102) of the output portion(LO1). An optical sensor(112) measures the selected output light. The resistor heater(106), the heater controller(108), the optical tap(110) and the optical sensor(112) are integrated.
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