Tunable optical wavelength filters and multi-level optical integrated circuits
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United States of America Patent
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Mar 8, 2005
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N/A
app pub date -
Feb 19, 2002
filing date -
Jan 11, 2001
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Abstract
The present invention comprises tunable optical wavelength filters and multi-level optical integrated circuits which use resonant optical cavities in a vertical arrangement with input and output waveguides. The resonant optical cavities are vertically separated from the input and output waveguides by a material or region of lower refeactive index. The vertical arrangement allows accurate control over the gap size between the waveguides and the cavities during manufacture. The present invention also enables the use of electrodes for enhancing tuning characteristics and for multiple tunable optical wavelength filters to be created in vertical alignment with one another by placing two resonant optical cavities and their respective input and output waveguides in vertical alignment with a low refractive index buffer between the multiple tunable optical wavelength filters. In addition, the present invention includes multiple manufacturing methods in which tunable optical wavelength filters are created on different substrates.
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