| 摘要 |
PURPOSE:To provide an optical communications apparatus in which number of components and optical couplers are reduced and reductions in size and cost are facilitated. CONSTITUTION:An optical communications apparatus has a photodetector for receiving a signal light, and outputs part of the signal from a midway of an optical fiber transmission line to communicate, and comprises a transmission type photodetector 11 inserted in a midway of the line 1, a light emitting element for generating a signal light and a photodetector for receiving the signal to conduct a duplex communications via a core optical fiber transmission line, wherein the photodetector 11 is inserted between the line 3 and a semiconductor laser module 13, thereby eliminating an optical demultiplexer, an optical demultiplexing/multiplexing element and optical coupling therefor. |
