| 摘要 |
PURPOSE:To eliminate the need for the space of the conventional photodetector and to reduce the manufacturing cost by forming a photodetector directly on the end face of an optical fiber by a thin film forming technique. CONSTITUTION:The photodetector 4 is formed directly on the end face of the optical fiber 1 by the thin film forming technique. The photodetector 4 is obtd. by forming 50OMEGA strip lines 5, 5' on the end face of the optical fiber 1 via a gap (b) interposed therebetween and forming an a-SiGe film 6 to about 1,000Angstrom thereon by a plasma CVD method and further forming an earth electrode 7 thereon over the entire surface. A signal can be taken out at a high speed of several tens - several PS from the other of the lines 5, 5' when several tens V voltage is impressed to one thereof. The need for the conventional photodetector is, therefore, eliminated and the manufacturing cost is reduced. |
