Based on the rate equations and light propagation equations, a novel theoretical model of double-cladding erbium-ytterbium co-doped superfluorescent fiber source (SFS) in double-pass forward (DPF) configuration has been presented. By optimum choosing the fiber length and pump power, the characteristics including mean wavelength stability, threshold, output power, and bandwidth of the SFS are theoretically analyzed in details. The effects of the variation in pump wavelength on the system performance are also been investigated. The analysis results show that a double-cladding erbium-ytterbium co-doped SFS in DPF configuration may serve as light source for the navigation-grade fiber-optic gyroscope applications.
In this paper, the operation principle of the broadband Er-Tm co-doped silica fiber amplifier when pumped at 980nm is presented. Numerical analysis of this broadband Er-Tm co-doped silica fiber amplifier has been performed based on the rate and propagation equations. The signal amplification gain as functions of the fiber length, the input pump power, the erbium-thulium concentration, as well as the pumping ways is described. The results show that the erbium- thulium co-doped silica fiber amplifier could provide more than 80 nm effective gain bandwidth, which is twice larger than the conventional singly erbium-doped fiber amplifier. The minimum gain value exceeds 9 dB when the launched pump power is higher than 400 mW. These results could be useful for the optimized design of DWDM amplifier in the near future.
The properties of a Ti:sapphire pumped CW operation Tm-Ho co-doped silica fiber lasers are presented. The lasing wavelength, output power, slope efficiency, and threshold are measured under different conditions. The measured maximum output power from the fiber laser of 240 mW at about 1870 nm was generated for a fiber length of 52 cm with an absorbed pumped power of 1.05 Watt at 796 nm. The slope efficiency of approximately 31% is similar to the singly Tm-doped fiber lasers. The longest output wavelength of 1970 nm was also generated from the Tm-Ho co-doped fiber laser when the fiber length was extended to 3.03 m, which shows the energy transfer process of the Tm-Ho co-doped system. A simplified numerical model is also constructed for the Tm-Ho co-doped silica system for 3F4 ground state absorption (GSA) pumping, which can be used to analyze the performance theoretically of the Tm-Ho co-doped silica fiber lasers.
The experimental results of erbium-ytterbium co-doped double-cladding fiber lasers (EYDCFLs) are reported. The output powers as functions of the input pump power, and the reflectivity of the cavity mirror are described. The maximum output power is about 733 mW, with a slope efficiency of about 30% and optical to optical conversion efficiency of 25.3 %. Numerical analysis of this EYDCFL was also performed based on the rate and propagation equations. The calculated output powers of 1.492 W and conversion efficiency of 51.4 % are doubled than the experimental results. That means further improvements could be made by optimum design of the laser, such as well cutting the fiber-end, adding dichroic mirror at the output end, or making fiber Bragg gratings directly in the fiber core.
With cascade oscillation scheme from level 5I6,to 5I7, to 5I8 in Ho3+: ZBLAN fiber laser, it not only can produce cW 3- and 2- ?m laser beams simultaneously from one oscillator with appropriate pumping source, but also improves the output power and efficiency. In this paper, the operation principles of 3- and 2- ?m cascade Ho3+: ZBLAN fiber laser is analyzed. Both dynamic and steady state rate equations of this laser pumped with1.1-?m band laser are given for the first time. Basic designs of this laser pumped by Ytterbium-doped double clad fiber lasers (YDCFL) are given. Based on the theoretical analysis and designs, numerical computations of the steady state rate equations were performed. The numerical solutions agree well with the experimental results.
The increasing capacity of wavelength-division multiplexing (WDM) transmission systems requires higher output power of erbium doped fiber amplifiers (EDFAs). The two improvements are the use of double cladding fibers (DCF) and the addition of ytterbium oxide as co-dopant in the glass base. In this paper, the operation principles of double-cladding erbium-ytterbium co-doped fiber amplifiers were analyzed. Numerical analysis of erbium-ytterbium co-doped DCF amplifiers using EY801 fiber manufactured by INO, Canada has been performed based on the rate and propagation equations. The maximum output power as functions of the fiber length, the input pump power, the erbium-ytterbium concentration and pumping ways were described. The results show that the ideal erbium-ytterbium co-doped DCF amplifier with EY801 fiber is that with the fiber length of about 62 meters, with as higher as possible pumping powers, and with doubled-ended pumping configuration.
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