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


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.

Publication DOI:
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: 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
Event Title: Photonics West 2002: High-power Lasers and Applications
Event Type: Other
Event Dates: 2002-01-28
Last Modified: 04 Jan 2024 18:08
Date Deposited: 22 Dec 2014 14:55
Full Text Link:
Related URLs: http://proceedi ... rticleid=874444 (Publisher URL)
PURE Output Type: Conference contribution
Published Date: 2002-04-05
Authors: Shu, Xuewen
Gwandu, Bashir A.L.
Zhang, Lin (ORCID Profile 0000-0002-1691-5577)
Bennion, Ian



Version: Published Version

Export / Share Citation


Additional statistics for this record