China Institute of Technology

National Formosa University

China University of Science and Technology

Wei-Ching Chuang

Kun-Yi Lee

Cheng-Che Lee

Wei-Yu Lee

Ruey-Fang Shyu

Kuen-Cherng Lin

Hsiao-Ping Liang

The present invention discloses a method for fabricating polymeric wavelength filter based on an asymmetric Bragg coupler with single-grating waveguide. The asymmetric waveguide coupler is formed firstly on a negative photo-resist mold. PDMS film is injected into the narrow waveguide of the coupler to act as a protection layer. The gratings pattern is exposed on the alternative waveguide and subsequently transferred to PDMS stamp mold. The PDMS stamp mold is used as a stamp to transfer the gratings pattern of the ABC wavelength filter onto UV cured polymer to form the final ABC filter. Whereby, the fabrication process is reliable and accurate, and can offer great potential for mass production of the ABC filter with single-grating waveguide.

Method of fabrication for an asymmetric Bragg coupler-based polymeric wavelength filter with single-grating waveguide

The present invention discloses a method for fabricating an optical filter based on polymer asymmetric bragg couplers using holographic interference techniques, soft lithography, and micro molding, which comprises following steps: prepare a UV polymer with gratings; coating photo-resister film on the UV polymer, and exposed by UV light to obtain a photo-resister mold with two grooves each having gratings; coating diluted PDMS film on the photo-resister mold, and baking the PDMS film to obtain a PDMS mold having two waveguides with gratings; placing glass substrate over the PDMS mold to form a first tunnel; injecting a precure UV polymer into the first tunnel to from a cladding layer with two grooves having gratings pattern at its bottom; placing glass slide over the cladding layer and injecting a mixed UV polymer into the grooves to form waveguide cores; placing a second glass substrate over the cladding layer, and injecting UV polymer to form an upper cladding layer laminated with the cladding layer to obtain the optical filter based on polymer asymmetric bragg couplers.

Optical filters based on polymer asymmetric bragg couplers and its method of fabrication

The present invention discloses a method for fabricating polymer wavelength filter with high-resolution periodical structure, which comprises: a positive photo-resister film is coated or a substrate, holographically exposed with grating pattern, and coated with a negative photo-resister film, then exposed by UV light and developed to obtain a waveguide mold having negative waveguide; a PDMS film coated on the waveguide mold, baked and peeled off to obtain a PDMS mold; a first tunnel formed over the PDMS mold, injected with a first UV polymer, then cured and separated the first UV polymer having groove to be the cladding layer of the polymer wavelength filter; a second UV polymer injected into the groove of the cladding layer, and cured to form the core of the waveguide in the groove of the cladding layer to finally be the polymer wavelength filter.

Polymer wavelength filters with high-resolution periodical structures and its fabrication using replication process

The present invention discloses a tunable optical integrated element using liquid crystal as an active layer, which is applied to filters, couplers or optical add/drop multiplexer. The present invention includes a layer of liquid crystal as an active layer, a first waveguide with grating and a second waveguide, an isolation layer, a pair of electrodes. By applying the external voltage to control the direction of the liquid crystal, the refractive index of the waveguide changes in accordance with the modulation of the electric field. Thus invention has the features of simple structure, easy assembling, lower cost and integrating ability.

Growing community of inventors

Taichung, Taiwan

Wei-Ching Chuang