HIGH-RELIABILITY OPTICAL SPLITTERS COMPOSED OF SILICA-BASED PLANAR LIGHTWAVE CIRCUITS

The environmental and mechanical reliability of a planar lightwave cir cuit (PLC)-type optical splitter modules is investigated with referenc e to the Bellcore requirements, The module is composed of Y-branching silica-based waveguides on Si connected to optical fiber with UV-curab le adhesives and is packaged in a metal case which is filled with humi dity-resistant resin, High optical performance such as low loss, low r eflection, and thermal stability are obtained through the use of this fiber connection technique, Ten reliability tests including long-term environmental and mechanical tests were carried out for more than ten PLC splitter modules, Under one of the most severe sets of conditions (75 degrees C and 90% RH), all the 19 samples we tested were stable fo r more than 5000 hours, Other tests confirmed that the PLC splitters o ffer long-term stability and that their optical characteristics have s ufficient mechanical strength. These results indicate that the PLC spl itters can be used for practical applications.