Abstract
In this work, a first report on fabricating an asymmetric Bragg coupler-based filter on polymeric waveguides without input-waveguide grating was revealed. The fabrication process we developed was using holographic interference techniques, capillary effect, soft lithography, and micro molding process. The transmission dip of about -9.2 dB and the 3 dB transmission bandwidth of about 0.125 nm were obtained from a filter.
Highlights
Optical add/drop multiplexer (OADM) devices, enabling the flexible insertion or extraction of a specific wavelength in optical fiber communications, have been indispensable components for wavelength division multiplexing (WDM)-based networks, accommodating large bandwidths for the global spread multimedia communications
In order to overcome the above drawback, we develop a process, incorporating the above technologies with capillary effect and microscopy technologies to fabricate an asymmetric Bragg coupler (ABC) filter without any self-reflections
An asymmetric waveguide coupler pattern was exposed on the negative photoresist film through polyethylene terephthalate (PET)-based mask using a UV mask aligner (AB-manufacturing, CA) for 9 seconds; this was followed by development in a SU-8 developer (MicroChem Corp., MA) for 45 seconds to obtain a negative waveguide coupler pattern (Fig. 2(a)-(c))
Summary
Optical add/drop multiplexer (OADM) devices, enabling the flexible insertion (add) or extraction (drop) of a specific wavelength in optical fiber communications, have been indispensable components for wavelength division multiplexing (WDM)-based networks, accommodating large bandwidths for the global spread multimedia communications. Polymeric materials possess unique optical and mechanical properties [14] such as relatively low refractive index resulting in lower surface-roughness scattering, manipulating by conventional or unconventional fabrication technologies, providing excellent platform for integrating numerous materials with different functions, and high flexibility for being bent and attached to non-planar surface. They are cost-effective and reliable for mass-production. It is the first report for ABC structures with a singlegrating waveguide on polymeric materials
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