Temperature Dependence Analysis of Mode Dispersion in Step-Index Polymer Optical Fibers

Abstract

Temperature dependence of the mode dispersion is investigated for commercially available polymethyl methacrylate (PMMA) based step-index polymer optical fibers. An analytical expression is proposed describing the thermal variation of the fiber refractive index. This index decreases with increasing temperature as density of the polymer material drops. The study covered the temperature range from −60• C to 100• C. Results show that the modal dispersion decreases and the bandwidth increases with rising temperature.

Transmission Performance of Plastic Optical Fibers Designed for Avionics Platforms

“…Bandwidth for the over-heated GH is now 527 MHz, revealing an important reduction compared to the initial 1143 MHz for the non-heated fiber. The power distribution has a width of 19°f or the over-heated GH, much wider than for the non-heated GH (13.5°) exhibiting an important increase in diffusion which correlates to the degradation in its frequency response [19], [20]. On the other hand, the BH fiber showed a behavior more stable than the GH when operated within the recommended temperature range.…”

A Temperature Sensor Based on a Polymer Optical Fiber Macro-Bend

“…The POF used in the experiments is a Rayon ® Eska ® SH-4001 (Mitsubishi, Tokyo, Japan) with core and cladding manufactured using polymethyl methacrylate (PMMA) and fluorinated polymer, respectively. The temperature dependence of the core refractive index can be expressed as [21]: $n_{\mathit{\text{Core}}}(T)=K_2\cdot T^2+K_1\cdot T+n_0$where K 1 = −1.15·10 −4 (°C) −1 is the thermo-optic (TO) coefficient of the core, K 2 = −5.173·10 −7 (°C) −2 is the second order temperature dependence term of the core and n 0 =1.49538 is the core refractive index at 0 °C. On the other hand, the temperature dependence of the cladding refractive index is given by [22]: $n_{\mathit{\text{Cladding}}}(T)=n_{\mathit{\text{Cladding}}}(T_0)+K_3\cdot (T-T_0)$where K 3 = −3.5·10 −4 (°C) −1 is the TO coefficient of the cladding and n Cladding (T 0 )=1.403 is the cladding refractive index at the reference temperature (T 0 = +25 °C).…”

Alternative methodology for intraocular lens characterisation

“…The new methodology was used at a temperature of about 26 ± 3°C and in air with a non‐polarized laser light with a wavelength of 632 nm. The IOL material in this case is PMMA, which may present a slight variation of refractive index of approximately 0.001 and non‐critical shape deviation from the in‐situ condition within this range of temperature variation. The impact of chromatic convergence is reduced because the methodology is based on two relative subtractive measurements performed with the same wavelength.…”