To independently and stably control optical switching characteristics or optical attenuation characteristics of a plurality of channels by eliminating interference of optical switching characteristics or optical attenuation characteristics among the channels even when the plurality of channels are provided.
A heater circuit for optical waveguides which is provided on a device 1 where a plurality of optical waveguides 2 are formed and heats the optical waveguides 2 to control refractive indexes is equipped with a plurality of electric supply pads 4 formed in the device 1 corresponding to the respective optical waveguides 2, a common electric supply pad 5 formed in the device 1 in common to the plurality of optical waveguides 2, a plurality of electric supply circuits which are wiring lines 6 and 7 connecting the respective electric supply pads 4 and common electric supply pad 5 and have the same resistance value, and a plurality of heater parts 3 which are provided to the wiring lines 6 and 7 of the respective electric supply circuits and then applied with voltages between the electric supply pads 4 and common electric supply pad 5 to generate heat, wherein the wiring lines 7 as many as the optical waveguides are led out of the common electric supply pad 5 to constitute the respective electric supply circuits.
| JP2004117448A | 2004-04-15 | |||
| JPH05173652A | 1993-07-13 | |||
| JPH05266963A | 1993-10-15 | |||
| JP2002365605A | 2002-12-18 | |||
| JP2003315855A | 2003-11-06 |
Nakamura Tomoyuki
Masakazu Ito