| 摘要 |
PURPOSE:To switch an optical path of an emitted light in many directions corresponding to different wavelength by one piece of element by using a means for allowing light beams of plural wavelength to be made incident on an optical deflecting element and plural photodetectors for photodetecting an emitted light of the optical deflecting element. CONSTITUTION:For instance, when a semiconductor laser light for generating five wavelength lambda1 - lambda5 is made incident on an optical deflecting element 30 through a confluence waveguide 70, semiconductor lasers 50 - 55 switch the connection of a driving power source 100 so that one of five elements can be driven. Driving currents I1 - I5 of the optical deflecting element switch and supply plural constant-current sources or use a variable current source. As for both change over switches 58, 59, an electronic switch operated by a signal from a control circuit is used. In this state, an emitted light 40 is converged to the photodetecting surface of a photodetector array 20 on the substrate surface 21 opposed to the surface on which the optical deflecting element, etc., are installed through a lens system 60, and since the emitted beam is almost a parallel light in the longitudinal direction of the waveguide, a focus is set on a focal plane of the lens. In such a way, while maintaining a feature being miniature and capable of integration to a semiconductor element, switching of a multipoint can be executed per one element. |
