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Deposition Sciences Produces High Yield Filter
Jun 2000
CLEVELAND, June 6 -- Deposition Sciences Inc. (DSI), a subsidiary of Advanced Lighting Technologies Inc., has reached what it is calling a benchmark in its dense wavelength division multiplexing (DWDM) filter program. Using its MicroDyn reactive sputtering coating technology, DSI has produced its first 3200 GHz optical bandpass filter. The patented MicroDyn technology will enable the company's DWDM filter program to develop high-yield mass-produced 200 GHz filters.
Most of today's WDM and DWDM thin-film filters are produced using evaporation or ion-assisted evaporation coating techniques, said Eric Krisl, DSI's vice president of corporate engineering. Evaporation technology already produces 200 GHz and 100 GHz optical band pass filters, but has inherent production limitations. Device yields are low, and can be less than 5 percent. Successful implementation of MicroDyn for these filters would provide higher yields and the same or better bandwidth coverage as obtained using evaporation coating techniques.
The 3200 GHz bandpass filters will be available to potential customers this month under the IsoFilter product line

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