Resonant wavelength and wavelength separation tunable dual-channel fiber Bragg grating based on filling functional material into highly birefringent photonic crystal fiber

摘要

Resonant wavelength and wavelength spacing tunable dual-channel fiber Bragg gratings based on filling functional material into highly birefringent photonic crystal fibers is proposed and investigated. The tuning properties of the resonance wavelength of Bragg gratings depended on altering the liquid indices filled in the holes of PCF are theoretically investigated. It is demonstrated that the resonant wavelengths are tuned as wide as 40 nm with a slope of 80 nm per refractive index unit (RIU), and wavelength spacing as large as 5 nm with a slope of approximate 12 nm/RIU corresponding to the two orthogonal polarization states.