Modelling, fabrication and characterization of long period gratings inscribed by femtosecond laser
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DOI: 10.1016/j.ijleo.2021.166283
Abstract: Abstract In this paper, we present a method to fabricate long period gratings in standard telecommunications single mode fibers (SSMF), using a femtosecond laser system. A numerical model based on the coupled mode theory was… read more here.
Keywords: femtosecond laser; long period; modelling fabrication; period ... See more keywords
Real-time analysis of arc-induced Long Period Gratings under gamma irradiation
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DOI: 10.1038/srep43389
Abstract: In this paper, we present a comparative experimental and theoretical study on gamma radiation sensitivity of Long Period Gratings (LPGs), fabricated by electric arc discharge technique, as monitored in three single mode optical fibers supplied… read more here.
Keywords: arc; period gratings; real time; long period ... See more keywords
Spatially Arrayed Long Period Gratings in Multicore Fiber by Programmable Electrical Arc Discharge
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DOI: 10.1109/jphot.2016.2639499
Abstract: Based on electrical arc discharges mechanisms, we inscribed spatially arrayed long period gratings (LPGs) into a heterogeneous seven-core fiber. The LPG fabrication platform was built upon the commercial fiber fusion splicer with a self-developed real-time… read more here.
Keywords: period gratings; fiber; spatially arrayed; electrical arc ... See more keywords
Resin Directional Flow and Degree of Cure Sensing Using Chirped Optical Fiber Long Period Gratings
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DOI: 10.1109/jsen.2017.2739422
Abstract: The use of chirped long period gratings (CLPGs) for monitoring the flow, the direction of the flow, and the subsequent cure of an epoxy resin is presented. The asymmetric properties of the CLPG and its… read more here.
Keywords: period gratings; resin directional; cure; long period ... See more keywords
Sensing Characteristics of Arc-Induced Long Period Gratings in Polarization-Maintaining Panda Fiber
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DOI: 10.1109/jsen.2017.2755370
Abstract: We present and discuss an investigation of the sensing features of long period gratings fabricated in a polarization-maintaining Panda optical fiber, by means of the electric arc discharge technique. In particular, the investigation regards the… read more here.
Keywords: period gratings; polarization; maintaining panda; long period ... See more keywords
Sensing Characteristics of Helical Long-Period Gratings Written in the Double-Clad Fiber by CO2 Laser
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DOI: 10.1109/jsen.2018.2855038
Abstract: We demonstrate the fabrication of helical long-period gratings (HLPGs) with the periodic helical index modulation by twisting the double-clad fiber (DCF) while the fiber was exposed by CO2 laser. Torsion, bending, surrounding refractive index, temperature… read more here.
Keywords: double clad; period gratings; co2 laser; fiber ... See more keywords
Sensitivity Enhancement in Long Period Gratings by Mode Transition in Uncoated Double Cladding Fibers
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DOI: 10.1109/jsen.2019.2942639
Abstract: This work deals with long period gratings (LPGs) fabricated in double cladding fibers (DCFs) with W-type refractive index profile and analyzes their surrounding refractive index (SRI) sensitivity. The W-type fiber presents an outer cladding with… read more here.
Keywords: double cladding; long period; period gratings; cladding fibers ... See more keywords