Long-period gratings in highly germanium-doped, single-mode optical fibers for sensing applications
| Autor: | Schlangen, Sebastian, Bremer, Kort, Zheng, Yulong, Böhm, Sebastian, Steinke, Michael, Wellmann, Felix, Neumann, Jörg, Roth, Bernhard, Overmeyer, Ludger |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Single mode fibers
Single-mode optical fiber Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau germanium-doped fiber Long period fiber grating lcsh:Chemical technology Article amplitude mask High numerical apertures Fiber optic sensors Long-period fiber grating Fluorine compounds Germanium doped fiber lcsh:TP1-1185 Optical fibers Single-mode fiber excimer laser Excimer laser High NA fiber Germanium Monitoring applications single-mode fiber Fused silica Liquefied petroleum gas long-period fiber grating high NA fiber Bend insensitive fiber High NA Germanium-doped fiber Diffraction gratings ddc:620 Amplitude mask Long Period Gratings Excimer lasers |
| Zdroj: | Sensors 18 (2018), Nr. 5 Sensors, Vol 18, Iss 5, p 1363 (2018) Sensors (Basel, Switzerland) |
| Popis: | Long-period fiber gratings (LPGs) are well known for their sensitivity to external influences, which make them interesting for a large number of sensing applications. For these applications, fibers with a high numerical aperture (i.e., fibers with highly germanium (Ge)-doped fused silica fiber cores) are more attractive since they are intrinsically photosensitive, as well as less sensitive to bend- and microbend-induced light attenuations. In this work, we introduce a novel method to inscribe LPGs into highly Ge-doped, single-mode fibers. By tapering the optical fiber, and thus, tailoring the effective indices of the core and cladding modes, for the first time, an LPG was inscribed into such fibers using the amplitude mask technique and a KrF excimer laser. Based on this novel method, sensitive LPG-based fiber optic sensors only a few millimeters in length can be incorporated in bend-insensitive fibers for use in various monitoring applications. Moreover, by applying the described inscription method, the LPG spectrum can be influenced and tailored according to the specific demands of a particular application. © 2018 by the authors. Licensee MDPI, Basel, Switzerland. |
| Databáze: | OpenAIRE |
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