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SwedenBritt-Mari SvenssonERICSSON Components. Micro Electronic Access Devices,Opto and RF-power Products5-164 81 Stockholm, SwedenABSTRACTCommercially available polyimides (PT) have been evaluated in the form of a 20x20 jim waveguide on a silicon substrate with 6jim quartz as undercladding. A Fabry-Perot laser diode (LD) has been aligned to the waveguide. Silicone elastomere (SiR) hasbeen multi-purposely used for overciadding ofthe waveguide, for idexmatching between the waveguide and LD and forencapsulation ofthe LD.The optical characterization of the whole device has included measurements of optical output power as a function of drivecurrent (T/P curves), and threshold current as a function oftime. No statistically significant increase of threshold current hasbeen notified during the test period.It has been shown that the optical loss spectrum ofthe waveguide over the wavelength intervall of 0.6-1 .6 jim is stronglydependent on the curing parameters of the P1.1. INTRODUCTIONWide use of plastic materials for packaging, waveguiding and light distrubution (Y-branches etc) is required in order to achievelow cost, small size, and low power consumption in optical interconnects at different levels. Possible applications include single-and multi mode for both telecom (such as intra-office and Fiber-In-The -Loop FIlL), and datacom (such as Local Area NetworkLAN) systems.Low price materials and processes must be used, and they have to be compatible with standard wafer technologies. Conciderableefforts are made at many laboratories in order to find suitable polymeric materials'. So far no ideal material combinations havebeen identified.The purpose of this study was to investigate feasibility of making an optomodule with polymeric waveguides and an LD, directlyincapsulated with silicone elastomere.One important objective is also to gain information about influence ofthe different materials and processes on the opticalperformance of the device.The polyimide material group looks promising for optical guided-wave interconnect, which is a result of good establishedcompatibility with silicon, good temperature and chemical properties and the variaty of approaches for waveguide fabrication.2''4Silicones are already widely used in electronic industry thanks to their superior properties, such as thermal stability, chemicalstability and non- flammability. SiR:s are also excellent materials for overciadding of waveguides, encapsulation of LD,indexmatching between waveguides and LD. They have good optical transparency. It has been reported that a clear correlationbetween their chemistry and refractive index exists.560819414484/94/$6.OO |
