Wdm optical filter and glass substrate for use in the wdm...

Details Wdm optical filter and glass substrate for use in the wdm... Wdm optical filter and glass substrate for use in the wdm...

H - Electricity

04

J

H04J 14/02 (2006.01) C03C 3/078 (2006.01) C03C 3/083 (2006.01) C03C 17/34 (2006.01) G02B 5/28 (2006.01) G02B 6/34 (2006.01) G02B 7/00 (2006.01)

Patent

CA 2314841

A glass substrate is for use in a WDM optical filter which has an optical multilayer coated on the glass substrate and is formed by glass which has a composition related to the optical multilayer so as to assure stable multiplexing/demultiplexing operation in the optical filter. The glass includes SiO2 as a glass network-former and has an average linear thermal expansion coefficient between 100 x 10 -7/K and 130 x 10 -7/K within a temperature range between -30 °C and +70 °C. The glass may include TiO2, Al2O3, and R20(R: alkali metal element) in addition to SiO2 and may have a hardness suitable for the optical multilayer.

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