Optical filter element and wavelength division multiplexing optical coupler
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United States of America Patent
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Apr 8, 2008
Grant Date -
Jul 20, 2006
app pub date -
Jan 17, 2006
filing date -
Jan 19, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical filter element having high isolation and reduction in reflection loss for input light beams. The optical filter element is used with a transparent substrate having a surface that includes a first area and a second area. The optical filter element has a target wavelength range. The optical filter element includes a first dielectric multilayer film arranged in the first area of the transparent substrate. A second dielectric multilayer film is arranged in the second area of the surface of the transparent substrate. The second dielectric multilayer film has a reflectance of a predetermined value or less for a light beam having a wavelength in the target wavelength range. A portion of the second dielectric multilayer film and a portion of the first dielectric multilayer film are laminated each other.
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