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Fabrication of advanced fiber Bragg gratings by use of sequential writing with a continuous-wave ultraviolet laser source
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
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2002 (English)In: Applied Optics, ISSN 0003-6935, E-ISSN 1539-4522, Vol. 41, no 6, 1051-1056 p.Article in journal (Refereed) Published
Abstract [en]

We present a novel scheme based on sequential writing for fabrication of advanced fiber Bragg gratings. As opposed to earlier sequential methods this technique uses a cw UV laser source and allows for very precise control and repetitivity of the formation of the gratings. Furthermore it is possible to use high average irradiances without destroying the fiber, resulting in considerable reduction in fabrication time for complex gratings. The method has been applied to several test gratings, which proved its versatility and quality.

Place, publisher, year, edition, pages
2002. Vol. 41, no 6, 1051-1056 p.
Keyword [en]
Fiber Bragg gratings; Interferometers; Irradiation; Phase shift; Ultraviolet radiation; Lasers
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-7129DOI: 10.1364/AO.41.001051ISI: 000173934400010OAI: diva2:12047
QC 20100813. Tidigare titel: Fabrication of advanced fiber Bragg gratings using sequential writing with a continuous-wave ultraviolet laser source. Ändrad 20100813.Available from: 2007-05-16 Created: 2007-05-16 Last updated: 2010-08-16Bibliographically 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.
Trita-ICT/MAP, 2007:4
Bragg gratings, optical fibres, optical fibre components
National Category
Physical Sciences
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
QC 20100812Available from: 2007-05-16 Created: 2007-05-16 Last updated: 2010-08-13Bibliographically approved

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