Long period gratings written into a photonic crystal fibre by a femtosecond laser as directional bend sensors

Allsop, Thomas D.P.; Kalli, Kyriacos; Zhou, Kaiming; Lai, Yicheng; Smith, G.; Dubov, Mykhaylo; Webb, David J.; Bennion, I.

doi:10.1016/j.optcom.2008.07.001

Cited by 64 publications

(35 citation statements)

References 17 publications

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“…The grating period Λ = v/ f is then controlled by the frequency f of the modulated laser output. Commonly used for LPG-inscription [60][61][62][63][64][65], this approach has also been successfully employed for Bragg reflecting waveguides in bulk material [39,[66][67][68], especially in combination with high repetition rate lasers that increase fabrication speed significantly [66,68]. (Ams et al reviewed distributed feedback lasers based on such Bragg waveguides extensively in [31]).…”

Section: Direct Writingmentioning

confidence: 99%

“…Thus, the remaining FBG is of Type II. Naturally, in-fiber Type II gratings that are operable up to close to the melting point of a glass fiber are ideal for sensors in harsh environments (e. g. [43,53,61,65,[92][93][94][95][96]). …”

Section: Annealing Propertiesmentioning

confidence: 99%

“…The bend-induced coupling peak responded with −1.6nm · m for concave and +3.8nm · m for convex bending, thus allowing for determination of the bend direction [63]. With a femtosecond pulse written, transversally asymmetric LPG in a PCF, a bend sensor could be realized, with −11.4nm · m for concave and 7nm · m for convex bending [65].…”

Section: Sensingmentioning

confidence: 99%

See 2 more Smart Citations

Femtosecond pulse written fiber gratings: a new avenue to integrated fiber technology

Thomas

Voigtländer

Becker

et al. 2012

Laser & Photonics Reviews

156

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The use of ultrashort laser pulses for fiber grating inscription has many advantages in comparison to continuous wave and long pulse lasers. The most important one is that it allows inscription in nonphotosensitive fiber materials. In this paper the principal inscription techniques and the physical properties of femtosecond (fs) pulse written in-fiber gratings are reviewed. The role of focusing and order walk-off on the inscribed structures is emphasized. A fs pulse written fiber Bragg grating (FBG) also has a unique coupling behavior, due to a refractive index change that is independent from the fiber geometry. Selected applications of such gratings for sensing and fiber lasers are discussed.

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Section: Direct Writingmentioning

confidence: 99%

Section: Annealing Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Femtosecond pulse written fiber gratings: a new avenue to integrated fiber technology

Thomas

Voigtländer

Becker

et al. 2012

Laser & Photonics Reviews

156

View full text Add to dashboard Cite

show abstract

“…In order to avoid some drawbacks of the femtosecond laser technique, such as low efficiency (Allsop et al, 2008) or a H 2 -loading pre-procedure (Fotiadi e al., 2007), S. Liu et al propose to tightly focus femtosecond infrared beam onto the holey inner-cladding region of a PCF (Liu et al, 2010). As shown in Fig.…”

Section: Lpgs In Ig-pcfsmentioning

confidence: 99%

Long Period Gratings in New Generation Optical Fibers

Iadicicco¹,

Paladino²,

Pilla³

et al. 2012

Recent Progress in Optical Fiber Research

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“…However, they also exhibit high-temperature cross-sensitivity and a wide bandwidth of the cladding mode resonances, which causes measurement errors and difficulty in multiplexing. (1,2) On the other hand, chirped fiber Bragg gratings (CFBGs) or linearly etched fiber Bragg gratings (FBGs) can be used for curvature measurements because the power reflectivity changes upon bending. Substantial flexible beams for embedded CFBGs or etched FBGs are essential for this type of sensor.…”

Section: Introductionmentioning

confidence: 99%

Dependence of the Reflection Wavelength Shift of a Resin-Embedded Grating Fiber on the Resin Material

2018

Sensors and Materials

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The dependence of the center reflection wavelength shift of a resin-embedded fiber Bragg grating (FBG) on the resin material was investigated for the use of the grating fiber as a bending deflection sensor (4 × 8 × 40 mm 3 ). The reflection center wavelength for an FBG embedded in acrylic adhesive shifted linearly by up to 3.1 nm owing to the deflection caused by a bend feeder displacement of 1.2 mm. These wavelength shifts were approximately 60 times larger than those for an etched FBG with one side of the cladding etched to within 11 μm of the core and 33 times larger than those for an FBG embedded in a modified silicon adhesive. These results depend primarily on Young's modulus of the resin material used to embed the FBG.

show abstract

Long period gratings written into a photonic crystal fibre by a femtosecond laser as directional bend sensors

Cited by 64 publications

References 17 publications

Femtosecond pulse written fiber gratings: a new avenue to integrated fiber technology

Femtosecond pulse written fiber gratings: a new avenue to integrated fiber technology

Long Period Gratings in New Generation Optical Fibers

Dependence of the Reflection Wavelength Shift of a Resin-Embedded Grating Fiber on the Resin Material

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