Super-high temperature sensitivity of long-period gratings in B/Ge co-doped fiber

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

Research output: Chapter in Book/Published conference outputConference publication


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°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/°C achieved by the 10th cladding mode of the 240μm LPFG is nearly 24 times that of the minimum value (0.075nm/C) exhibited by the 30th mode of the 34μm LPFG. Such devices may lead to high-efficiency and low-cost thermal/electrical tunable loss filters or sensors with extremely high temperature resolution.
Original languageEnglish
Title of host publicationRare-Earth-doped materials and devices VI
EditorsShibin Jiang, Robert W. Keys
Number of pages5
Publication statusPublished - 5 Apr 2002
EventPhotonics West 2002: High-power Lasers and Applications - San Jose, CA, United States
Duration: 28 Jan 2002 → …

Publication series

NameSPIE proceedings
ISSN (Print)0277-786X


ConferencePhotonics West 2002: High-power Lasers and Applications
Abbreviated titlePhotonics West 2002
Country/TerritoryUnited States
CitySan Jose, CA
Period28/01/02 → …

Bibliographical note

Xuewen Shu ; Bashir A. 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, 16 (April 5, 2002).

Copyright 2002 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


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