Dual wavelength filtering properties and applications of the π-phase-shifted sampled fiber Bragg gratings

Abstract

Multi-ð-phase-shifted fiber Bragg gratings and ð-phase-shifted sampled fiber Bragg gratings (SFBGs) with dual wavelength filtering properties are compared. Results show that both of these gratings have the dual wavelength reflective spectra. However, the side lobe of the reflective spectrum of ð-phase-shifted SFBGs is lower than that of multi-ð-phaseshifted gratings. By adjusting the duty cycle in the range of 0.66 0.80, the filtering properties of ð-phase-shifted SFBGs are optimized, and the side lobe suppression ratio (SLSR) is the lowest when the duty cycle is 0.75. The application of the ð-phase-shifted SFBGs in the dual-wavelength laser is also demonstrated.

Keywords

Reflective Spectrum / Duty Cycle / Fiber Bragg Grating / Side Lobe / Reflective Peak

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