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Synthesis of polysilisiquioxane used as core layer material of optical waveguide

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Colorless and transparent polysilisiquioxane was synthesized using non-hydrolytic sol–gel process. A high degree of poly-condensation and a lower remnant ratio of Si–OCH3 were calculated by 29Si NMR and 1H NMR, respectively. After spin-coating, subsequently UV and thermal curing, free-cracked thin films were obtained. The properties of the free-cracked thin films were measured by a prism coupler and thermal analysis system. The refractive index increased to 1.5495 (1,310 nm TE) and 1.5468 (1,550 nm TE), respectively, with the increasing of phenyltrimethoxysilane content to 20 mol%. Birefringence was below 0.0005. The thermo-optic coefficient was about −2.8 × 10−4 °C−1. The optical loss was 0.20 dB cm−1 at 1,310 nm and 0.75 dB cm−1 at 1,550 nm, which was very important for core layer material of optical waveguide. The results of Thermo-Gravimetric Analysis indicated an excellent thermal stability. All of these properties imply that it will be a promising core layer material of optical waveguide.

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This work was performed with support from the National Natural Science Foundation of China (No. 50143013, No. 60577014 and No. 60807015).

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Correspondence to Jinyan Wang or Xigao Jian.

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Zhang, J., Wang, J., Wang, L. et al. Synthesis of polysilisiquioxane used as core layer material of optical waveguide. J Sol-Gel Sci Technol 56, 197–202 (2010).

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