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Characterization of Fiber Bragg Gratings by Use of Optical Coherence-Domain Reflectometry
ACREO AB, Kista.
Norwegian Univ. of Sci. and Technol., Trondheim.
ACREO AB, Kista.
ACREO AB, Kista.
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1999 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 17, no 11, 2371-2378 p.Article in journal (Refereed) Published
Abstract [en]

A method based on optical low coherence reflectometry for complete characterization of fiber Bragg gratings (FBG's) is presented. It is shown that the measured signal corresponds to the impulse response of the grating filter, and the measurement therefore. yields all information about the device, Experiments have been carried out with a novel dual-channel interferometer, The results are in excellent agreement with the theory, demonstrating the versatility of the method for characterization of fiber gratings.

Place, publisher, year, edition, pages
1999. Vol. 17, no 11, 2371-2378 p.
Keyword [en]
Interferometry; Light reflection; Optical fibers; Optical filters; Fiber Bragg gratings (FBG); Optical coherence-domain reflectometry; Diffraction gratings
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-7128DOI: 10.1109/50.803033ISI: 000083675100058OAI: oai:DiVA.org:kth-7128DiVA: diva2:12046
Note
QC 20100812Available from: 2007-05-16 Created: 2007-05-16 Last updated: 2010-08-17Bibliographically approved
In thesis
1. Fibre Bragg Gratings: Characterization, Realization and Simulation
Open this publication in new window or tab >>Fibre Bragg Gratings: Characterization, Realization and Simulation
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The main topic of this thesis is realization and characterization of fibre Bragg gratings.

A novel versatile grating fabrication technique is developed and a number of gratings are realized, showing the potential of the system. Arbitrarily-shaped gratings are sequentially imprinted in the fibre by a moving interference pattern created with a continuous-wave ultraviolet (UV) source. This scheme allows for a very good control and stability of the grating shape, which is also shown experimentally. As opposed to most other present fabrication techniques, the proposed method offers a total control over the grating parameters by software, enabling simple implementation of new designs.

Different kinds of error sources when stitching long gratings are identified and investigated regarding impact on the final grating result.

Another important question within this field is how to characterize gratings. We propose a new characterization method based on optical low-coherence reflectometry (OLCR). A new interferometer design allows for simple simultaneous detection of the reflection response from two different points in the interrogated grating, so that differential measurements can be performed. The advantage of this is that the sensitivity to noise caused by e.g. thermal fluctuations in the system is substantially reduced. Several test gratings have been investigated and a very good agreement to the expected results is noted.

A second characterization technique using interferometric detection of the side diffraction from the grating under test is investigated both theoretically and experimentally. With aid of two-dimensional theory for wave propagation, it is shown that there is a linear relation between the detected phase and modulation depth and the corresponding grating properties. The technique is evaluated with a novel scheme of implementation where the UV source provided in a fabrication setup is used assource for the side probe. This approach results in a very simple implementation and opens for an integration of the characterization and fabrication systems.

Finally, a tuning method for transmission filters based on local heating of linearly chirped fibre Bragg gratings is analysed and further developed to allow for fully software-controlled operation. The potential of this technique is illustrated by some promising initial experimental results.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. viii, 64 p.
Series
Trita-ICT/MAP, 2007:4
Keyword
Bragg gratings, optical fibres, optical fibre components
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-4381 (URN)978-91-7178-621-0 (ISBN)
Public defence
2007-06-01, N2, KTH-Electrum 3, Isafjordsgatan 28A/D, Kista, 10:15
Opponent
Supervisors
Note
QC 20100812Available from: 2007-05-16 Created: 2007-05-16 Last updated: 2010-08-13Bibliographically approved

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