OPTICAL SPACE TRANSMITTING METHOD AND OPTICAL SPACE TRANSMITTER

摘要

PURPOSE: To facilitate the adjustment of the optical axis of an optical transmission/reception part and to exactly transmit light by observing a collimator light beam. CONSTITUTION: Signal light λ1 and collimator light λ2 whose wavelength is shorter that than of signal light is emitted by mixing the light by an optical coupler 15. When a light projecting lens 16 is transmitted, to beam spreading angle of the collimator light becomes smaller than the beam spreading angle of signal light, and the beam of the collimator light becomes the beam diameter which is smaller than the beam diameter of the signal light and is located at the center of the beam of the signal light in an optical reception part, at the stage when the light projecting lens 16 is transmitted by the difference of the refractive index of the light projecting lens 16 for the signal light and the collimator light. The optical axis of an optical transmission part 10 and the optical reception part 20 is adjusted so that a collection lens 21 may be irradiated with the collimator light beam. The boresight light collected by the collection lens 21 is eliminated by a band-pass filter 22 and only signal light is received by a light receiving element 23.