Cleaving of TOPAS and PMMA microstructured polymer optical fibers: Core-shift and statistical quality optimization

Abstract

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Angle dependent Fiber Bragg grating inscription in microstructured polymer optical fibers

“…Cleaving was done with a fiber cleaver fabricated in-house [23], where the temperature of both blade and fiber holding plate was set to around 65°C.…”

Fast and stable gratings inscription in POFs made of different materials with pulsed 248 nm KrF laser

“…The FBG is inscribed in the fiber that is placed close to the phase mask with two 3D translational stages to guarantee the correct positioning of the fiber and avoid undesired bending of the POF. The POFs were cleaved with a hot blade on a plate using the suitable temperature reported for each fiber [8,16,18,20,21,34,38], which were butt-coupled with a silica pigtail. In order to carry out the inscription experiments, the POFs sections were UV-glued (LOCTITE AA 3936) to two 8° angled silica fiber pigtails on both sides of the POFs.…”

“…However, the glass transition temperature can vary significantly among different grades of Topas. For instance, Topas 8007 presents T g of only 78°C, which is even lower than the PMMA glass transition temperature [17] and which implies that fiber cleaving parameters are quite different for POFs made of PMMA and Topas [21]. The low glass transition temperature of Topas 8007 fibers severely limits the range of temperature sensing.…”

“…Conventionally, the inscription of POFBGs is made with the phase mask technique using continuous wave (CW) 325 nm HeCd UV lasers [25]. With this laser, the writing time in POFs was ranging from few to hundreds of minutes depending on the polymer material the fibers were made from, the inscription power, the structure of the fibers, and so on [8,19,21,22]. These inscription times can be significantly reduced by doping the fiber, which can be made with trans-4-stilbenemethanol (TS) that can also increase the grating reflectivity [28,29].…”

Novel polymer functionalization method for exposed-core optical fiber

“…Poly(methyl methacrylate) (PMMA) polymer optical fibers (POFs) have high elastic strain limits, high fracture toughness, and high flexibility in bending, however high attenuation properties and difficulties with splicing, cleaving and coupling makes small core size POF sensors challenging [14][15][16][17]. On the other hand, silica is known to be reliable under a range of processing and use environments, with relatively better mechanical and thermal stability [13].…”