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.
|Title of host publication||Rare-Earth-doped materials and devices VI|
|Editors||Shibin Jiang, Robert W. Keys|
|Number of pages||5|
|Publication status||Published - 5 Apr 2002|
|Event||Photonics West 2002: High-power Lasers and Applications - San Jose, CA, United States|
Duration: 28 Jan 2002 → …
|Conference||Photonics West 2002: High-power Lasers and Applications|
|Abbreviated title||Photonics West 2002|
|City||San Jose, CA|
|Period||28/01/02 → …|
Bibliographical noteXuewen 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