Title :
Pump-induced thermal effects in Er-Yb fiber grating DBR lasers
Author :
Xu, Y.Z. ; Tam, H.Y. ; Liu, S.Y. ; Demokan, M.S.
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech. Univ., Hung Hom, Hong Kong
Abstract :
Large absorption of 980-nm pumping in Er-Yb doped fibers causes significant temperature differentials along small length of the fibers. When pumped with 40 mW of power, unequal Bragg wavelength shifts of 0.25 and 0.16 mm were measured in the respective 6- and 10-mm-long Bragg reflectors constructed around the Er-Yb core of a 2.5-cm-long DBR laser. This causes large fluctuation in the laser´s output power. Stable operation resumed with increased pump power. At 68 mW of pump power, 0.32-nm shift in lasing wavelength (corresponding to a temperature rise of 38/spl deg/C) was measured in the distributed Bragg reflector fiber laser.
Keywords :
diffraction gratings; distributed Bragg reflector lasers; erbium; fibre lasers; laser stability; laser transitions; optical pumping; photothermal effects; ytterbium; 10 mm; 2.5 cm; 40 mW; 6 mm; 68 mW; 980 nm; Bragg reflectors; Er-Yb core; Er-Yb fiber grating DBR lasers; distributed Bragg reflector fiber laser; increased pump power; large fluctuation; laser output power; lasing wavelength; mW pump power; pump-induced thermal effects; small length; stable operation; temperature differentials; temperature rise; unequal Bragg wavelength shifts; Absorption; Distributed Bragg reflectors; Fiber gratings; Fiber lasers; Laser excitation; Power lasers; Power measurement; Pump lasers; Temperature; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
