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  • Title: Characteristics and crosstalk of optical waveguides fabricated in polymethyl methacrylate polymer circuit board.
    Author: Hamid HH, Rüter CE, Thiel DV, Fickenscher T.
    Journal: Appl Opt; 2016 Nov 10; 55(32):9017-9021. PubMed ID: 27857284.
    Abstract:
    Electro-optical circuit boards should provide simple and cost-effective coupling techniques and crosstalk levels of less than -30  dB. 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 500  μm×570  μm 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 -40  dB for 65-mm-long waveguides. This fabrication method shows potential for dense optical interconnects with very low crosstalk.
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