Design and Fabrication of Highly-Dense Optical Components for In-Service Fiber Testing and Monitoring in Subscriber Loops(Special Issue On Devices, Packaging Technology, and Subsystems for the Optical Access Network)

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This paper describes the design and performance of optical components for in-service fiber testing and monitoring in optical subscriber loops. As the number of test fibers increases, compact and cost-effective components are becoming more important. To meet this need, we have developed a highly-dense hybrid structure for optical couplers and filters, which both play key roles in testing systems. It was realized by utilizing a polyimide-base thin film filter and a waveguide-type wavelength insensitive coupler. This component operates by combining a signal and a test light with a ratio of 80/20% and isolating the test light with a value of gt50dB. The experimental samples were successfully fabricated with an excess loss of lt1dB, a return loss of gt40dB, a plolarization dependent loss (PDL) of lt0.3dB, and good enviromental and mechanical stability. We successfully applied the samples to an optical branch module (OBM), and achieved a component density twice that of a conventional module. The optical characteristics of the OBM met our target values. The results we obtained for termination cords incorporating the polyimide-base filter were also satisfactory.
社団法人電子情報通信学会の論文
1997-01-25