Phase-Shifted Fiber Bragg Grating Transmission Filters Based on the Fabry-Perot Effect

Liu, Y.u; Lee, S. B.; Choi, Sang Sam

doi:10.3807/josk.1998.2.1.030

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…In this context, by introducing a phase shift in the middle of the grating, the result will be the formation of two identical Bragg gratings, separated by a cavity with a length of L c . This structure is similar to the Fabry-Perot resonator [42]. The reflection from the firs FBG will be out of phase with the reflection from the second FBG, making interference occur due to the overlap of the light rays reflecte by the two FBGs.…”

Section: Theory Of Ps-fbg Structuresmentioning

confidence: 99%

“…This means that the PS-FBGs can be considered as a particular case of the FabryPerot cavities based on Bragg gratings. The physical mechanism of a PS-FBG can be well understood in analogy with the Fabry-Perot resonators [42]. However, a PS-FBG is not a simple Fabry-Perot cavity, since the reflection are distributed along the fibe length and the reflect vities depend on wavelength.…”

Section: Theory Of Ps-fbg Structuresmentioning

confidence: 99%

“…The reflection from the firs FBG will be out of phase with the reflection from the second FBG, making interference occur due to the overlap of the light rays reflecte by the two FBGs. The phase shift between the rays reflecte by the two Bragg gratings separated by the cavity L c can be estimated by [42]:…”

Section: Theory Of Ps-fbg Structuresmentioning

confidence: 99%

See 2 more Smart Citations

Phase-Shifted Bragg Grating Inscription in PMMA Microstructured POF Using 248-nm UV Radiation

Pereira

Pospori

Antunes

et al. 2017

J. Lightwave Technol.

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Abstract-In this work, we experimentally validate and characterize the first phase-shifted polymer optical fiber Bragg gratings (PS-POFBGs) produced using a single pulse from a 248-nm krypton fluoride laser. A single-mode poly (methyl methacrylate) optical fiber with a core doped with benzyl dimethyl ketal for photosensitivity improvement was used. A uniform phase mask customized for 850-nm grating inscription was used to inscribe these Bragg structures. The phase shift defect was created directly during the grating inscription process by placing a narrow blocking aperture in the center of the UV beam. The produced high-quality Bragg grating structures, presenting a double dips, reject 16.3 dB (97.6% reflectivity) and 13.2 dB (95.2% reflectivity) of the transmitted power, being therefore appropriate for sensing or other photonic applications. Its transmission spectrum possesses two sharp transmission notches, allowing a significant increase in measurement resolution compared to direct interrogation of a single grating. The reflection and transmission spectra when multiple phase shifts are introduced in the fiber Bragg grating structure are also shown. The PS-POFBG's strain, temperature, pressure, and humidity characteristics have been experimentally analyzed in detail to assess their potential usage as sensors.

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Section: Theory Of Ps-fbg Structuresmentioning

confidence: 99%

Section: Theory Of Ps-fbg Structuresmentioning

confidence: 99%

See 1 more Smart Citation

Phase-Shifted Bragg Grating Inscription in PMMA Microstructured POF Using 248-nm UV Radiation

Pereira

Pospori

Antunes

et al. 2017

J. Lightwave Technol.

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show abstract

“…This configuration consists in two separate FBGs forming a Fabry-Perot (FP), where only a resonance state is allowed; the result of adding a π-phase-shift in the middle of the grating leads to an extremely narrow notch in the reflection spectrum whose position is usually coincident with the Bragg wavelength, as reported in Figure 8 . It can also be realized with a detuning phase that differs of π [ 24 ]. This way, it is possible to move the notch frequency from the middle of the spectrum.…”

Section: Physics Of Fibre Bragg Gratingmentioning

confidence: 99%

Fibre Bragg Grating Based Strain Sensors: Review of Technology and Applications

Campanella

Cuccovillo²,

Yurt³

et al. 2018

Sensors

374

185

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Fibre Bragg grating (FBG) strain sensors are not only a very well-established research field, but they are also acquiring a bigger market share due to their sensitivity and low costs. In this paper we review FBG strain sensors with high focus on the underlying physical principles, the interrogation, and the read-out techniques. Particular emphasis is given to recent advances in highly-performing, single head FBG, a category FBG strain sensors belong to. Different sensing schemes are described, including FBG strain sensors based on mode splitting. Their operation principle and performance are reported and compared with the conventional architectures. In conclusion, some advanced applications and key sectors the global fibre-optic strain sensors market are envisaged, as well as the main market players acting in this field.

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“…The phase shift ϕ between the rays reflected by the two Bragg gratings separated by the cavity can be estimated [77,78] by:…”

Section: Psfbgsmentioning

confidence: 99%

Recent Achievements on Grating Fabrications in Polymer Optical Fibers with Photosensitive Dopants: A Review

et al. 2022

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This review discusses recent achievements on grating fabrications in polymer optical fibers doped with photosensitive materials. First, different photosensitive dopants in polymer optical fibers (POFs) are summarized, and their refractive index change mechanisms are discussed. Then, several different doping methods to fabricate the photosensitive POFs are presented. Following that, the principles of gratings, including standard fiber Bragg gratings (FBGs), tilted fiber Bragg gratings (TFBGs), chirped fiber Bragg gratings (CFBGs), phase-shifted fiber Bragg gratings (PSFBGs), and long period fiber gratings (LPFGs), are reported. Finally, fabrications of different gratings based on photosensitive POFs in the last 20 years are reported. We present our article clearly and logically, so that it will be helpful for researchers to explore a broad perspective on this proposed topic. Overall, the content provides a comprehensive overview of photosensitive POF fabrications and grating inscriptions in photosensitive POFs, including previous breakthroughs and recent advancements.

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Phase-Shifted Fiber Bragg Grating Transmission Filters Based on the Fabry-Perot Effect

Cited by 11 publications

References 9 publications

Phase-Shifted Bragg Grating Inscription in PMMA Microstructured POF Using 248-nm UV Radiation

Phase-Shifted Bragg Grating Inscription in PMMA Microstructured POF Using 248-nm UV Radiation

Fibre Bragg Grating Based Strain Sensors: Review of Technology and Applications

Recent Achievements on Grating Fabrications in Polymer Optical Fibers with Photosensitive Dopants: A Review

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