Abstract
In essence, a long period fibre grating (LPFG) is an all-fibre device with wavelength dependent loss. As a band rejection filter, all light in a spectral slice is discarded without affecting the amplitude and phase of neighbouring wavelengths, with the additional advantage of low insertion losses and minimum backreflection (Daxhelet, 2003). LPFGs have been used as band rejection filters, sensors, wavelength selective elements in fibre lasers and amplifiers (Su W while parallel LPFGs act as wavelength selective couplers or wavelength multiplexers (Chan & Yasumoto, 2007; Shu et. al.,2002). In a common LPFG, the core mode couples to co-propagating cladding modes supported by the cladding-external medium waveguide structure. The specific cladding through which the core mode is coupled is determined by the following resonance condition: i ecla eco n n 2 2 (1)
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
