Temperature‐dependent transmittance of cascaded long‐period fiber gratings for sensor applications

Abstract

We propose cascaded long‐period fiber gratings (LPFGs), whose synthesized rejection band alters in bandwidth and loss according to ambient temperature. By using an edge‐emitting light‐emitting diode as an input light source, temperature dependence of the optical power through the cascaded LPFGs exhibits either a positive or a negative temperature coefficient. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1809–1811, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24489