Influence of humidity on refractive index of polymers for optical waveguide and its temperature dependence

Humidity dependence of the refractive index of deuterated polymethylmethacylate (d-PMMA) is examined at a wavelength of 1.3 μm using the return loss method. The refractive index of d-PMMA increases as humidity increases at room temperature, while it decreases as humidity increases at temperatures higher than 60 °C. This humidity dependence was ascribed to the counterbalance between moisture sorption and swelling. Some hydrophobic polymers, such as silicone resin and fluorinated epoxy resin were affected by humidity to a lesser degree than d-PMMA.

[1]  S. Imamura,et al.  Polymer channel waveguides with low loss at 1.3 mu m , 1991 .

[2]  S. Imamura,et al.  Polymer waveguide thermooptic switch with low electric power consumption at 1.3 mu m , 1993, IEEE Photonics Technology Letters.

[3]  Saburo Imamura,et al.  Influence of Temperature and Humidity Change on Optical Waveguide Circuits Composed of Deuterated and Fluorinated Methacrylate Polymers , 1995 .

[4]  S. Nagasawa,et al.  Temperature dependence of return loss for optical fiber connectors with refractive index-matching material , 1995, IEEE Photonics Technology Letters.

[5]  Norio Murata,et al.  UV-curable adhesives for optical communications , 1991 .

[6]  F. Bueche.  Diffusion of water in polymethyl methacrylate , 1954 .

[7]  Klaus Petermann,et al.  DIGITAL OPTICAL SWITCH BASED ON OVERSIZED POLYMER RIB WAVEGUIDES , 1996 .

[9]  B. Strebel,et al.  4*4 polymer thermo-optic directional coupler switch at 1.55 mu m , 1994 .

[10]  J. Dugas,et al.  Refractive-index variations with temperature of PMMA and polycarbonate. , 1986, Applied optics.

[11]  T. C. Lee,et al.  Temperature dependence of index of refraction of polymeric waveguides , 1992 .

[12]  Y. Kokubun,et al.  Athermal waveguides for temperature-independent lightwave devices , 1993, IEEE Photonics Technology Letters.

[13]  Albert Feldman,et al.  Optical and physical parameters of Plexiglas 55 and Lexan. , 1979, Applied optics.

[14]  D. T. Turner.  Polymethyl methacrylate plus water: sorption kinetics and volumetric changes , 1982 .

[15]  Yasuyuki Inoue,et al.  Polymeric arrayed-waveguide grating multiplexer operating around 1.3 mu m , 1994 .