Fabrication of chirped fibre gratings by novel stretch and write technique

Byron, K.C.; Rourke, H.N.

doi:10.1049/el:19950033

Cited by 36 publications

(10 citation statements)

References 9 publications

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“…Chirped gratings are desirable for making dispersion compensators [27]. A variety of different methods have been developed to manufacture gratings that are chirped permanently [28,29] or have an adjustable chirp [30,31].…”

Section: Fabrication Of Fiber Bragg Gratingsmentioning

confidence: 99%

Flat-cladding Fibre Bragg Grating sensors for large strain fatigue tests

Li¹

2023

Preprint

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In the design of mechanical components, the fatigue of material are of particular importance as ~80% of metal failures in practice arise from fatigue. The fatigue life is generally determined from low cyclic fatigue tests at large strain. This thesis developed a novel flat-cladding Fiber Bragg Grating sensor array applied in the characterization of LCF properties of three different specimens. With a new bonding process, large strain amplitude measurement of up to [plus or minus] 8000 μ [epsilon] was achieved in the Aluminum base metal and asymmetric hysteresis loops at high strain amplitudes due to twinning in compression and subsequent detwinning in tension was observed in Magnesium alloy. Moreover, an abnormal softening and hardening variation in different zone of friction stir welded Aluminum alloy was discovered throught the FBG sensor distribution. The validity shows that the FBG sensor a vital tool in the LCF tests at large strain amplitudes. Furthermore, due to its small size, the multiplexed FBG sensor array could also be applied to the measurements of strain distribution.

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Section: Fabrication Of Fiber Bragg Gratingsmentioning

confidence: 99%

Flat-cladding Fibre Bragg Grating sensors for large strain fatigue tests

Li¹

2023

Preprint

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“…A simple technique that can be used with both the two-beam interferometer and the phase mask methods was proposed in 1994 by Byron and Rourke [12]: A CFBG is generated by concatenating uniform gratings with increasing consecutive periods utilizing a single uniform period phase mask and applying a variable axial strain on the fiber. Recently, an improved version of this technique has been presented, which allows arbitrary group delay responses [13].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, an improved version of this technique has been presented, which allows arbitrary group delay responses [13]. However, the proposed procedure in [13], as the one in [12], is based on a step-by-step writing process, which requires shielding of the UV beam before and after each writing step. This technique induces overlapping and phase mismatching between consecutive sections due to the nonsquared shape of the UV beam and the limited accuracy of the positioning system, yielding irregularities in both the reflectance spectrum and the group delay response of the gratings, which result therefore unsuitable for many applications.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of chirped fiber Bragg gratings by simple combination of stretching movements

Pérez-Millán

Torres-Peiró

Cruz

et al. 2008

Optical Fiber Technology

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“…However, these methods are generally not stable enough to enable fabrication of high quality CFBGs. Byron et al [31] proposed a stretching-andwriting method for the fabrication of CFBGs. Compared with other approaches, the method proposed by Byron et al [31] is comparably simple; only one additional motorized stage is required to be inserted into the standard UV exposure system for inscribing CFBGs.…”

Section: Motivationmentioning

confidence: 99%

“…Byron et al [31] proposed a stretching-andwriting method for the fabrication of CFBGs. Compared with other approaches, the method proposed by Byron et al [31] is comparably simple; only one additional motorized stage is required to be inserted into the standard UV exposure system for inscribing CFBGs. However, the method has not been investigated in great detail, and tailoring of CFBGs with an arbitrary grating profile is still a challenge.…”

Section: Motivationmentioning

confidence: 99%

Research and development of optical filters for wavelength division multiplexing systems

Zheng¹

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Due to the advantages of low insertion loss, low polarization sensitivity, compactness, low cost, all-fiber geometry and ease of fabrication, fiber Bragg gratings (FBGs) have evolved into critically important optical filters for a wide variety of applications in wavelength division multiplexed (WDM) systems. This thesis investigates the theoretical issues involved in the synthesis or design of optical filters based on FBGs as well as the experimental issues involved in the fabrication of optical filters based on chirped fiber Bragg gratings (CFBGs). In many system applications, it is critically important to find a grating with a desired complex reflection response (i.e. reflection spectrum and phase response). As such, this thesis studies various optimization methods for the development of a powerful and versatile methodology for the synthesis or design of FBG-based filters with complicated characteristics. As a result, a new staged continuous tabu search (SCTS) optimization algorithm is developed for solving global optimization problems. A novel synthesis method based on the proposed SCTS algorithm is developed for the design of optical bandpass filters and linear phase optical filters based on FBGs. As a further improvement on this SCTS-based synthesis method, a novel two-stage hybrid optimization method is proposed for the synthesis of FBG-based filters with more complicated characteristics. Using this hybrid method, an optical bandpass filter

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Fabrication of chirped fibre gratings by novel stretch and write technique

Cited by 36 publications

References 9 publications

Flat-cladding Fibre Bragg Grating sensors for large strain fatigue tests

Flat-cladding Fibre Bragg Grating sensors for large strain fatigue tests

Fabrication of chirped fiber Bragg gratings by simple combination of stretching movements

Research and development of optical filters for wavelength division multiplexing systems

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