| 摘要 |
PURPOSE:To provide a light transmission and reception module in which a semiconductor laser element and a photodetector for transmission and reception are formed as a single package and one optical fiber can be bidirectionally used, which is miniaturized, by which electric output having intensity high enough to multiplex wavelength is obtained and which is excellent in the speed of response. CONSTITUTION:The semiconductor laser element 1 for transmission and the photodetector 3 for reception are respectively optically coupled to a fiber pigtail 32 by using a micro-lens 31 through an optical branching element 20. A photodetector 2 for monitoring output from the element 1 is provided. A half mirror or a filter having wavelength selectivity can be used as the element 20, and the light transmission and recpetion module in which one optical fiber is bidirectionally used as a whole and which multiplexes the wavelength is constituted. |
