| 摘要 |
PURPOSE:To easily obtain stable characteristics by integrally providing an optical multiplexing demultiplexing filter and a hemispherical lens onto the optical axis of the surface, formed with a prescribed angle, of a transparent prism. CONSTITUTION:The hemispherical lens 15 and the optical filter 16 are mounted to the position on the optical axis of the light, which is radiated from a laser diode 11 and can be changed to collimated beams of light by a spherical lens 12, on the surface, which is formed with the prescribed angle, of the glass prism 17. An optical fiber 13 and a photodiode 14 are respectively disposed to the focal position of the lens 15 and the diode 11 is disposed to the focal position of the lens 12. Positioning of the prism 17 is, therefore, easy and the angle setting of the filter 16 with the optical axis is easily executed with the high accuracy by improving the working accuracy of the prism 16. The stable characteristics are easily obtd. in this way. |
