Fabrication of chirped Bragg gratings in photosensitive fibre

Byron, K.C.; Sugden, Kate; Bricheno, T.; Bennion, I.

doi:10.1049/el:19931104

Cited by 108 publications

(30 citation statements)

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“…This can be explained by the reduction of the germanium concentration in the diffused fiber core, as the photo-refractive index change is proportional to the germanium concentration in the fiber core [3]. The fabricated chirped fiber gratings have losses at a wavelength shorter than the main transmission dips due to outcoupling by the Bragg grating [4]. This loss can be further reduced by increasing the grating-mode overlap using several methods [5].…”

Section: Fabrication and Analysis Of Chirped Fibermentioning

confidence: 99%

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Fabrication and Analysis of Chirped Fiber Bragg Gratings by Thermal Diffusion

Cho¹,

Park²,

Kang³

2004

ETRI J

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Section: Fabrication and Analysis Of Chirped Fibermentioning

confidence: 99%

“…There are various types of fiber Bragg grating structures including the common Bragg reflector, the blazed Bragg grating, and the chirped Bragg grating [3], [4]. Generally, chirped fiber gratings are fabricated by using a non-periodic phase mask and a UV light source.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Analysis of Chirped Fiber Bragg Gratings by Thermal Diffusion

Cho¹,

Park²,

Kang³

2004

ETRI J

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“…The first chirped gratings were aperiodic waveguide gratings [18]. Over the years, a multitude of techniques emerged to inscribe CFBGs by side illumination with UV-lasers [19][20][21][22]. Since different wavelengths are reflected at different positions in the grating, the time delay of reflected light can be governed: For example it is possible to compensate the inner fiber dispersion of hundreds of fiber meters with a short chirped fiber Bragg grating [23].…”

Section: Laser and Photonics Reviews J Thomas Et Al: Femtosecond Pulsmentioning

confidence: 99%

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

Thomas

Voigtländer

Becker

et al. 2012

Laser & Photonics Reviews

155

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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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“…Advances in grating fabrication methods and fiber photosensitivity enhancement techniques have made it possible to fabricate a variety of index-modulated structures within the core of an optical fiber including Bragg grating (López-Higuera, 2002), long period gratings (Vengsarkar et al, 1996), π-phase shifted grating (Canning and Seats, 1994), blazed or tilted gratings (Erdogan and Sipe, 1995) and various types of chirped gratings (Byron et al, 1993).…”

Section: Fiber Bragg Grating Sensorsmentioning

confidence: 99%

Fiber Optic Sensors for Transportation Infrastructural Health Monitoring

Chang¹,

Mehta²

2010

American Journal of Engineering and Applied Sciences

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Problem statement: Monitoring the health of transportation infrastructures is currently reliant on transportation maintenance teams. Scheduled and periodic inspections on most of the infrastructures are performed by manual and visual operations, which are generally time consuming and costly procedures. The use of the fiber optic sensor technology makes it possible to realize continuous, real time and automatic health monitoring for the transportation infrastructure. Approach: This article provided a tutorial introduction to transportation infrastructural health monitoring using fiber optic sensors. Since the topic spans many disciplines, our goal was limited to providing a basic conceptual framework. We began by reviewing the prerequisite topics from structural health monitoring and fiber optic sensors, including a brief review of point and distributed fiber optic sensor technologies. We then provided a comprehensive review of key fiber optic sensors which may be used in the transportation infrastructure monitoring. Results: Point fiber optic sensors were first discussed and then distributed fiber optic sensors. Performances of each sensor are discussed based on the transportation infrastructure monitoring application. Conclusion: We concluded the tutorial with a number of observations on the current directions of the research field of the fiber optic sensor for the transportation infrastructure health monitoring.

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Fabrication of chirped Bragg gratings in photosensitive fibre

Cited by 108 publications

References 1 publication

Fabrication and Analysis of Chirped Fiber Bragg Gratings by Thermal Diffusion

Fabrication and Analysis of Chirped Fiber Bragg Gratings by Thermal Diffusion

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

Fiber Optic Sensors for Transportation Infrastructural Health Monitoring

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