Abstract
Problem statement: Advanced optoelectronic devices are a kind of key and basic components for next generation communication, untouched sensor, medical testing. They have lots of advantages including greater communication performance, larger capacity, and more fixable form. But light coupling and package structure seriously affects performance of optoelectronic devices. So a lot of attaching methods were proposed to package optoelectronic devices. A popular method which was widely used is a UV epoxy adhesive which can solidify the coupling interface with high mechanical strength and submicron displacement. In order to obtain high coupling efficiency, coupling approximation after adhesive is needed. Approach: In this study, firstly, the light coupling model was introduced. Then light beam propagation mode after adhesive with the same refractive index as that of light path was presented and the function modeling of couple model was derived. Finally, a slanted-plane structure of interface was considered and coupling approximation after adhesive was calculated. Results: Simulations and experimental results indicate that theoretical coupling efficiency and measured coupling efficiency agree with very well and the couple loss decrease about 0.4dB after adhesive. Conclusion: The matching adhesive could obviously increase the coupling efficiency and the approximation function could realize to predict the variation of coupling efficiency before or after adhesive accurately.
Highlights
The current trend in optics communication is developing to achieve greater system performance, larger capacity and more fixable form
In Dense Wavelength Division Multiplexing (DWDM) systems, some nanostructures are frequently used for optical signal processing, which include VCSEL lasers, alloptical buffers and micro-resonators, In addition, there are some late model devices to emerge in the optical display and optical sensor fields, including holographic polymer dispersed liquid crystals and photonic crystals
When some adhesive is positioned in light path, Refractive Index (RI) of the path will change the optical beam propagation condition, which brings about increase of Coupling Efficiency (CE) or decrease, but little research on the misalignment pattern after epoxy adhesive is reported, including alignment tolerances of coupling after adhesive gluing
Summary
The current trend in optics communication is developing to achieve greater system performance, larger capacity and more fixable form. Nanotech., 1 (2): 68-77, 2010 interests in the development of these automation adhesive with the same refractive index as that of fiber techniques to improve photonic alignment and core is most appropriate for couple efficiency owing to packaging efficiency and the researches and product reducing the misalignment loss and minimizing the developments have been performed and got many reflection loss.
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