We designed, manufactured and characterized two birefringent microstructured fibers that feature a 5-fold increase in polarimetric sensitivity to hydrostatic pressure compared to the earlier reported values for microstructured fibers. We demonstrate a good agreement between the finite element simulations and the experimental values for the polarimetric sensitivity to pressure and to temperature. The sensitivity to hydrostatic pressure has a negative sign and exceeds -43 rad/MPa x m at 1.55 microm for both fibers. In combination with the very low sensitivity to temperature, this makes our fibers the candidates of choice for the development of microstructured fiber based hydrostatic pressure measurement systems.
We have manufactured and characterized a birefringent holey fiber of a new construction. The birefringence in this fiber is induced by the highly elliptical shape of the core, which consists of a triple defect in a hexagonal structure. Using a hybrid edge-nodal finite-element method, we calculated the spectral dependence of phase and group modal birefringence for spatial modes E11 and E21 in idealized and in real fiber, whose geometry we determined by using a scanning-electron microscope. Results of our calculations show that technological imperfections significantly affect the fiber's birefringence. Normalized cutoff wavelengths for higher-order modes relative to the filling factor were also determined for the idealized structure. We observed a significant disagreement between theoretical and experimental values of cutoff wavelengths, which was attributed to high confinement losses near the cutoff condition. We also measured the spectral dependence of the phase and the group modal birefringence for spatial modes E11 and E21. The measured parameters showed good agreement with the results of modeling.
-The paper presents comparison of thermal and optical properties of the typical commercial available and manufactured in our laboratory poly(methyl metacrylate) polymer useful in polymer optical fibers technology. The thermal studies were made by thermogravimeter connected on-line with FT-IR and QMS spectrometer, the optical properties were characterized by spectral attenuation measurements. It was found that polymer obtained in our laboratory is characterized by higher temperature (about 100 0 C) of beginning mass loss occurred and lower attenuation then commercial available polymer.Microstructured optical fibers (MOFs) provide extra degrees of freedom in manipulating the optical properties of light, such as dispersion, nonlinearity, and birefringence [1][2][3][4][5]. Therefore they have attracted increased interest over the last two decades. Due to specific material properties, the technology of microstructured polymer optical fibers (mPOF) has been intensively developed in recent years. Polymer fibers may show better parameters than fibers made of silica glass in a variety of applications. One of the advantages is biological compatibility, which opens the possibility for medical applications. Moreover polymers have higher flexibility than silica glass, therefore can withstand much higher strains, which enables applications of polymer fibers as elongation sensors in a strain range unattainable for silica fibers [6]. In order to obtain a polymer optical fiber with the proper optical characteristics, it is necessary to prepare specific preform from which optical fibers are drawn or extruded. Now polymer optical fibers are mainly manufactured from poly(methyl methacrylate) PMMA (linear polymer), produced by the polymerization of methyl methacrylate. Unfortunately the main disadvantage of "PMMA optical fibers" is their very high losses, in comparison with "silica fibers", mainly caused by C-H bonds and impurities. In this letter we present the low loss poly(methyl metacrylate) polymer manufactured in our Laboratory. The manufactured from our polymer mPOF was characterized by significant decrease of the losses.* E-mail: pawel.mergo@poczta.umcs.lublin.pl A sample of "our PMMA" was prepared from methyl methacrylate (ALDRICH). In polymer technology two methods of polymerization are used -thermal and photopolimerization. The chemical reaction, essentially, takes place in the same way, except the source of initiation. Due to the crosslinking of the polymer during photopolymerization, this technique is not used in the polymer optical fibers technology. A very important issue in the production of materials for optical applications is their purity. Even a small amount of impurities can significantly decrease the transmission properties of the final product such as an optical fiber. Therefore, MMA was purified before starting the process of polymerization. The purification is performed by distillation process in under pressure conditions getting rid of impurities as well as undesirable inhibitor, which is added to ...
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