Characterisation of Bragg gratings in fibreswith the heat-scan technique

Sandgren, Simon; Sahlgren, Bengt; Asseh, A.; Margulis, Walter; Laurell, Fredrik; Stubbe, R.; Lidgard, A.

doi:10.1049/el:19950428

Cited by 21 publications

(6 citation statements)

References 5 publications

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“…This spectral response is generated by the optical beating between the spectra of the unperturbed grating regions, modulated by the phase shift induced by the loading. The main difference, here, with previously reported works on phase-shifted FBG [11][12][13], is when the birefringence axes are rotated, which may happen if the loading is along a direction different to the fast or slow axis of the fiber, and then there is coupling between polarization modes as shown in Fig. 3(b).…”

Section: Response Of Fbg Written In Specialty Single-mode Fibersmentioning

confidence: 70%

Spectral Response of FBG Written in Specialty Single-Mode Fibers

Torres¹,

Botero-Cadavid²,

Vélez³

2008

AIP Conference Proceedings

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Abstract. In this work, we describe the spectral properties of fiber Bragg gratings (FBGs) in Hi-Bi PANDA fibers subjected to diametrical compression and fibers with internal electrodes, as two examples of the facilities offered by specialty single-mode fibers for processing optical signals. Due to the complex structure of the fibers, the induced effects on the fiber effective birefringence are presented and discussed, based on numerical analysis with the finite element method.

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Section: Response Of Fbg Written In Specialty Single-mode Fibersmentioning

confidence: 70%

Spectral Response of FBG Written in Specialty Single-Mode Fibers

Torres¹,

Botero-Cadavid²,

Vélez³

2008

AIP Conference Proceedings

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“…The relatively short length of the FBGs and the separation between the fiber and the hot wire means that the hot wire is effectively heating up the entire FBG, causing the grating to shift up in wavelength by approximately 0.3 nm. The localized heat source does not create any spectral separation of the peak such as that seen in the previous heat scanning techniques, [8][9][10] and allows fast continuous scanning with only peak wavelength detection algorithms. The low temperature and short exposure time do not create any annealing-induced changes in the grating profile or reflected peak wavelength.…”

Section: Characterizationmentioning

confidence: 99%

“…Heat scanning techniques have also been used to characterize FBGs that induce a phase change in the FBG spectra. [8][9][10] Limitations include slow scanning times to allow for thermal stabilization, requiring up to 20 min for FBG characterization. These combined limitations of scanning time, setup complexity, stripping coating, and resolution meant they were not directly suitable for the basis for the automated marking of long DTG arrays as part of a device manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Automated location of fiber Bragg gratings in draw tower grating arrays using a thermal scanning technique

et al. 2014

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For some critical applications, the location of fiber Bragg gratings (FBGs) in draw tower grating (DTG) arrays needs to be determined to sub-mm accuracy; for example, successful packaging of the FBGs in mm scale packages. The DTG manufacturing process leaves no external visible identification marks on the fiber, hence location needs to be determined prior to packaging. This work presents an automated fiber marking system that can accurately locate the positions of the FBGs within AE0.1 mm. The simple, low cost, and automated system avoids manual fiber handling and allows accurate packaging of the FBGs for sensing applications.

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“…The fiber's refractive index in this small heated region will be perturbed when the fiber is heated at this point due to the thermo-optical effect. When heating the fiber at a certain point, the change in the fiber's length can be neglected compared with the thermallyinduced phase shift because the thermal expansion coefficient is much smaller than the thermal-optical coefficient of the fiber [126]. Due to the thermo-optical effect, the refractive index of the fiber will change when a phase shift is introduced at this heating point.…”

Section: Chapter 6 Tunable Comb Filter and Tunable Multi-wave Length mentioning

confidence: 99%

“…As a result, broad spectral perturbations will be introduced into the short-wavelength side of the main spectral peaks [126]. By placing heat sinks on the two sides of each resistance wire, the broad spectral perturbations of the spectral peak in the shortwavelength range can be reduced (as shown in Fig.…”

Section: Tunable and Switchable Multiwavelength Optical Sourcementioning

confidence: 99%

Development of tunable multiwavelength fiber laser sources for photonic applications

Liu¹

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Wavelength division multiplexing (WDM) is an attractive technology that enables the transmission of multiple wavelength channels on the same large-bandwidth optical fiber, resulting in a huge increase in transmission capacity. For implementation of the next generation of optical networks to meet the ever increasing demand of the end-users, it is essential to develop low-cost WDM optical sources with tunable features for flexible control of the wavelength channels such as the ability to tune the center wavelengths and the wavelength spacings of the wavelength channels. Considering that the complexity and cost of the WDM optical sources will increase as the number of wavelength channels (or subscribers) increases, multiwavelength optical sources capable of simultaneously generating multiple lasing wavelengths are highly desirable in the WDM networks. Furthermore, multiwavelength optical sources have other useful applications, which include fiber-optic sensing, and test and measurement of WDM components. This thesis documents the design and development of several novel tunable multiwavelength fiber lasers, such as a tunable multiwavelength fiber laser based on a fiber Sagnac loop filter, a tunable dual-wavelength fiber laser with tunable wavelength separation, and a tunable and switchable multiwavelength optical source. Exploring the elliptical-core feature of a polarization-maintaining erbium-doped fiber (PM-EDF) within the Sagnac loop filter, room-temperature multiwavelength lasing operation with tunable center wavelengths was achieved. Also a stable and tunable dual-wavelength fiber laser based on a fiber Bragg grating (FBG) written on a high-birefringence fiber with strain modulation was also developed, and dual-wavelength lasing operation with very narrow ii

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Characterisation of Bragg gratings in fibreswith the heat-scan technique

Cited by 21 publications

References 5 publications

Spectral Response of FBG Written in Specialty Single-Mode Fibers

Spectral Response of FBG Written in Specialty Single-Mode Fibers

Automated location of fiber Bragg gratings in draw tower grating arrays using a thermal scanning technique

Development of tunable multiwavelength fiber laser sources for photonic applications

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