Title :
Optimum parameter design of Er/sup 3+/-doped fiber for optical amplifiers
Author :
Ohashi, Masaharu ; Tsubokawa, Makoto
Author_Institution :
NTT Transmission Syst. Lab., Ibaraki, Japan
Abstract :
The parameters of Er/sup 3+/-doped fiber which optimize the signal gain of a fiber amplifier pumped by a 1.48- mu m laser diode are theoretically determined using the rate equation for a three-level laser system. The basic parameters specified are the relative-index difference and the cutoff wavelength. The optimum cutoff wavelength of a completely Er/sup 3+/-doped core fiber with a step-index profile is 0.8 mu m regardless of the value of the relative-index difference. The optimum cutoff wavelength depends on the Er/sup 3+/-doped area radius.<>
Keywords :
erbium; fibre lasers; laser theory; optical communication equipment; refractive index; 0.8 micron; 1.48 micron; Er/sup 3+/-doped area radius; Er/sup 3+/-doped fiber; cutoff wavelength; fiber amplifier; fibre lasers; laser diode; optical amplifiers; optical pumping; rate equation; relative-index difference; signal gain; step-index profile; three-level laser system; Equations; Erbium; Fiber lasers; Optical design; Optical fiber amplifiers; Optical fiber polarization; Optical fibers; Optical pumping; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
