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Characteristics and crosstalk of optical waveguides fabricated in polymethyl methacrylate polymer circuit board

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Abstract

Electro-optical circuit boards should provide simple and cost-effective coupling techniques and crosstalk levels of less than 30dB. A dicing saw was used to create waveguide grooves with a surface roughness of less than 183 nm in a 1.6-mm-thick polymethyl methacrylate polymer (PMMA) substrate. The buried optical waveguides were made from SU-8 in a PMMA substrate covered with a 1-mm PMMA sheet. The propagation loss for a 500μm×570μm straight waveguide was 0.9 dB/cm at 1310 nm. The coupling between parallel waveguides was measured at separation distances from 45 to 595 μm. The crosstalk was less than 40dB for 65-mm-long waveguides. This fabrication method shows potential for dense optical interconnects with very low crosstalk.

© 2016 Optical Society of America

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