Design Considerations for L band Erbium-doped Hole-assisted Lightguide Fiber Amplifiers

摘要

The finite element method is applied for solving the modal field of erbium-doped hole-assisted lightguide fiber (EDHALF). The modified average population inversion iteration method is proposed for simulating the gain coefficients of EDHALF amplifiers. The relation between the structural parameters of EDHALFs and the gain coefficient of L band EDHALF amplifiers is investigated by means of the finite element method combined with the modified average population inversion method. Four structural parameters of EDHALF-core diameter, the refractive index difference between the core and silica cladding, the relative hole-to-core spacing and the relative size of air holes are optimized in terms of the design criteria of L band erbium-doped fiber, which take into account the cutoff wavelengths, the gain coefficients of L band fiber amplifiers and the splice loss between the EDHALF and the conventional single-mode fiber. At last, the comparisons between the EDHALF and the conventional erbium-doped fiber for L band applications are made.