DocumentCode :
775114
Title :
Optimization of Broadband Gain Spectra of Cr 
:YAG Crystal Fiber Amplifier
Author :
Xu, Wenbin ; Jiang, Chun
Author_Institution :
State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Shanghai Jiao Tong Univ., Shanghai
Volume :
14
Issue :
5
fYear :
2008
Firstpage :
1382
Lastpage :
1386
Abstract :
In this paper, we present energy level, transition configuration, and numerical model of Cr3+/Cr4+:YAG crystal fiber amplifier for the first time, to the best of our knowledge. The rate and power propagation equations of the numerical model are solved and analyzed. The active ion concentration, length of the doped fiber, and pump power are optimized to maximize the bandwidth of the gain spectra. The effect of temperature on the gain spectra is also discussed. It is shown that based on analysis of the absorption spectra and emission spectra, Cr4+:YAG crystal is a three-level system, and the broadband gain of Cr 3+/Cr 4+ :YAG crystal fiber is attributed to the broad emission of Cr4+ ions, especially tetrahedral Cr 4+ in YAG. When excited at 800 nm, optimal fibers have ultrabroad gain spectra in the range of 1.2-1.65 mum, which cover the low-loss windows of the all-wave fiber without absorption peak caused by OH- group.
Keywords :
chromium; energy states; optical fibre amplifiers; optical fibre losses; stimulated emission; Cr3+ ions; Cr4+ ions; Cr4+:YAG crystal fiber amplifier; OH- group; YAG:Cr; active ion concentration; all-wave fiber; broadband gain spectra; energy level; low-loss windows; power propagation equations; rate propagation equations; transition configuration; ultrabroad gain spectra; wavelength 1.2 mum to 1.65 mum; wavelength 800 nm; All-wave fiber; Cr $^{4+}$ :YAG; Cr^4+:YAG; energy-level structure; numerical model; ultra-broadband;
fLanguage :
English
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
1077-260X
Type :
jour
DOI :
10.1109/JSTQE.2008.923294
Filename :
4553492
Link To Document :
