Superhigh temperature sensitivity of long-period gratings in B/Ge codoped fiber

Xuewen Shu; Bashir A.L. Gwandu; Lin Zhang; Ian Bennion

doi:10.1117/12.461657

5 April 2002 Superhigh temperature sensitivity of long-period gratings in B/Ge co-doped fiber

Xuewen Shu, Bashir A.L. Gwandu, Lin Zhang, Ian Bennion

Author Affiliations +

Proceedings Volume 4645, Rare-Earth-Doped Materials and Devices VI; (2002) https://doi.org/10.1117/12.461657
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States

Abstract

Long period fiber grating (LPFG) can be used as active gain controlling device in EDFA. However, LPFGs fabricated in the standard telecom fiber only have a typical temperature sensitivity of 3-10nm/100 degree(s)C, which may not be sufficient for implementing tuneable filters capable of wide tuning range and high tuning efficiency. In this paper, we report a theoretical and experimental investigation of thermal properties of LPFGs fabricated in B/Ge co-doped optical fiber. We have found that the temperature sensitivity of the LPFGs in the B/Ge fiber is considerably increased compared with those produced in the standard fiber. The LPFGs written in the B/Ge fiber have achieved, on average, one order of magnitude higher sensitivity than that of the LPFGs produced in the standard telecom fiber. We have also identified that the thermal response of LPFG is strongly dependent on the order of the coupled resonant cladding mode. The maximum sensitivity of 1.75nm/ degree(s)C achieved by the 10th cladding mode of the 240micrometers LPFG is nearly 24 times that of the minimum value (0.075nm/C) exhibited by the 30th mode of the 34micrometers LPFG. Such devices may lead to high-efficiency and low-cost thermal/electrical tunable loss filters or sensors with extremely high temperature resolution.

Citation Download Citation

Xuewen Shu, Bashir A.L. Gwandu, Lin Zhang, and Ian Bennion "Superhigh temperature sensitivity of long-period gratings in B/Ge co-doped fiber", Proc. SPIE 4645, Rare-Earth-Doped Materials and Devices VI, (5 April 2002); https://doi.org/10.1117/12.461657

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KEYWORDS

Cladding

Temperature metrology

Optical amplifiers

Tunable filters

Optical filters

Photonics

Sensors

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