Fiber Bragg grating inscriptions in multimode fiber using 800 nm femtosecond laser

摘要

A short fiber Bragg grating (FBG) was successfully written in a multimode fiber (MMF) tube with core and cladding diameters of 105 urn and 125 urn using 800 nm femtosecond laser. A side-illumination technique was utilized to ensure the grating inscriptions regain over the core of MMF. Both fundamental mode and high-order modes of MMF are coupled at the core-mismatch junction and appear as two well-defined resonances in transmission. Femtosecond laser-written three FBG-types present good thermostability up to 900 °C.