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Peculiarities of the Thermo-Optic Coefficient at High Temperatures in Fibers Containing Bragg Gratings

Fedin, Igor
http://rave.ohiolink.edu/etdc/view?acc_num=akron1309207081

Abstract Details

2011, Master of Science, University of Akron, Physics.
The temperature dependence of thermo-optic coefficient in silica-based fibers containing fiber Bragg gratings (FBGs) includes thermal instability of chemical composition gratings, non-linear temperature dependence of FBGs written in different fibers, quadratic behavior of FBGs, and long-term stability of silica-based FBGs. Experimental measurements of the thermo-optic coefficient for the temperature interval 50 – 780°C in fused silica fiber containing FBGs were conducted while the temperature shift of the Bragg’s peak was monitored between 1300 and 1311 nm with sub-Angstrom precision. Numerical computations were focused on the FBG’s diffraction efficiency calculations accounting for the temperature drift of the gratings and found to be in excellent agreement with obtained experimental data. It has been found that the thermo-optic coefficient changes between 0.79*10-5 and 1.45*10-5 K-1 and undergoes a minimum in the vicinity of 440°C. Additional observation indicates a negative sign of the second-order thermo-optic coefficient. The experiments reveal that the grating reflectivity decays at temperatures higher than 660°C which correlates with calculated decay of the refractive index modulation. It suggests that an FBG is erased at high temperatures. Based on the energy dispersive spectroscopy it has been determined that thermal erasing of the FBGs at a temperature around 780°C correlates well with germanium sublimation (apparently in the form of germanium monoxide) out of silica-based fiber cores.
Sergei F. Lyuksyutov, Dr. (Advisor)
David S. Perry, Dr. (Committee Member)
Robert R. Mallik, Dr. (Committee Chair)
60 p.
Optics
thermo-optic coefficient; fiber Bragg grating; grating decay; thermal decay of FBG; germanium-doped fiber; germanium defects; germanium color centers

Recommended Citations

Citations

  • Fedin, I. (2011). Peculiarities of the Thermo-Optic Coefficient at High Temperatures in Fibers Containing Bragg Gratings [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1309207081

    APA Style (7th edition)

  • Fedin, Igor. Peculiarities of the Thermo-Optic Coefficient at High Temperatures in Fibers Containing Bragg Gratings. 2011. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1309207081.

    MLA Style (8th edition)

  • Fedin, Igor. "Peculiarities of the Thermo-Optic Coefficient at High Temperatures in Fibers Containing Bragg Gratings." Master's thesis, University of Akron, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1309207081

    Chicago Manual of Style (17th edition)

akron1309207081
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© 2011, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.