Adjustable film filter
A thin-film filter and adjustable technology, applied in the direction of instrument, optical waveguide coupling, wavelength division multiplexing system, etc., can solve the problem of single transmission, etc., and achieve the effect of simplifying the system, reducing the quantity and reducing the volume
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[0015] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0016] see figure 1 , the tunable thin-film filter 30 provided by the present invention includes a thin-film waveguide 10 and a circular ring 308 surrounding the thin-film waveguide 10 .
[0017] Please also see figure 2 , the thin film waveguide 10 includes a substrate 102 and multi-layer thin films 104 formed on the substrate. The substrate 102 is composed of a glass substrate. The multi-layer film 104 is formed by alternately overlapping high refractive index layers 106 and low refractive index layers 108 . Most thin film materials used in optics are inorganic materials, usually made of metals, metal oxides (titanium dioxide, zirconium dioxide, etc.) and metal nitrides (silicon nitride, aluminum nitride, boron nitride, etc.). Other thin film materials include carbides (silicon carbide, germanium carbide, etc.), fluorides, mixtures of metal oxides, or mixtures...
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