The annealing properties of Type IA Bragg gratings are investigated and compared with Type I and Type IIA Bragg gratings. The transmission properties (mean and modulated wavelength components) of gratings held at predetermined temperatures are recorded from which decay characteristics are inferred. Our data show critical results concerning the high temperature stability of Type IA gratings, as they undergo a drastic initial decay at 100°C, with a consequent mean index change that is severely reduced at this temperature However, the modulated index change of IA gratings remains stable at lower annealing temperatures of 80°C, and the mean index change decays at a comparable rate to Type I gratings at 80°C. Extending this work to include the thermal decay of Type IA gratings inscribed under strain shows that the application of strain quite dramatically transforms the temperature characteristics of the Type IA grating, modifying the temperature coefficient and annealing curves, with the grating showing a remarkable improvement in high temperature stability, leading to a robust grating that can survive temperatures exceeding 180°C. Under conditions of inscription under strain it is found that the temperature coefficient increases, but is maintained at a value considerably different to the Type I grating. Therefore, the combination of Type I and IA (strained) gratings make it possible to decouple temperature and strain over larger temperature excursions.
|Title of host publication||Proceedings of SPIE - The International Society for Optical Engineering|
|Subtitle of host publication||Reliability of Optical Fiber Components, Devices, Systems, and Networks III|
|Editors||Hans G. Limberger, M. John Matthewson|
|Number of pages||12|
|ISBN (Print)||0819462497, 9780819462497|
|Publication status||Published - 23 May 2006|
|Event||Reliability of Optical Fiber Components, Devices, Systems, and Networks III - Strasbourg, United Kingdom|
Duration: 3 Apr 2006 → 4 Apr 2006
|Conference||Reliability of Optical Fiber Components, Devices, Systems, and Networks III|
|Period||3/04/06 → 4/04/06|
Bibliographical noteKyriacos Kalli ; George Simpson ; Helen Dobb ; Michael Komodromos ; David Webb and Ian Bennion "Annealing and temperature coefficient study of type IA fibre Bragg gratings inscribed under strain and no strain: implications to optical fibre component reliability", Proc. SPIE 6193, Reliability of Optical Fiber Components, Devices, Systems, and Networks III, 61930L (May 23, 2006);
Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
- fibre bragg gratings
- fibre reliability
- type IA grating