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The Japan Society of Applied Physics

Gain Coefficient Measurement of Er/Yb-Doped Fibre by using ^4I_{13/2} Level Pumping of Er ion

Hirotaka Ono

Published Jul 17, 2015• 0 citations
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Method for estimating gain coefficient spectrum of erbium-doped fiber based on net gain–loss measurement employing ^4I_13/2 level pumping

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The method for estimating the gain coefficient spectrum of an erbium-doped fiber (EDF) is proposed and demonstrated experimentally. The method employs a net gain-loss measurement that uses the 4I(13/2) level pumping of the EDF and the McCumber relation. A formula used to obtain the quotient of the gain and loss coefficient from the net gain-loss measurement is derived to determine the parameter in the McCumber relation. It is confirmed that the gain coefficient spectrum of an EDF estimated with the method coincides with the value estimated using a conventional net gain-loss measurement that employs the 4I(11/2) level pumping. The method is successfully applied to an erbium/ytterbium-doped fiber, for which it is impossible to perform a conventional net gain-loss measurement with pumping at the 4I(11/2) level of erbium ions because of the absorption transition of ytterbium ions from 2F(7/2) to 2F(5/2) levels.

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Numerical Analysis of 1.53μm Photoluminescence Characteristics in Yb-Er Co-doped Al_2O_3 Materials

Yufeng Liu

Considering cooperative up-conversion,cross-relaxation and excited state absorption,the rate equations of eight energy levels were founded for Yb-Er co-doped Al 2O 3 materials.The functions of coefficients of cooperative up-conversion,cross-relaxation and excited state absorption varied along with the concentrations of ytterbium and erbium were built phenomenologically.The relationship among 1.53 μm photoluminescence intensity,doped concentration,and pump power were numerically simulated for Yb-Er co-doped Al 2O 3 film.The results show that there is the optimum Yb-doped concentration when Er-doped concentration and pump power are constant.The optimal Yb∶Er ratio will decrease following with increase of pump power under the fixed Er-doped concentration,and the optimal Yb∶Er ratio will also decrease following with increase of Er-doped concentration when pump power is fixed.The computed results are in good agreement with the experiment surveys.

Bandaoti guangdian•Jan 1, 2007•0 citations
The method for estimating the gain coefficient spectrum of an erbium-doped fiber (EDF) is proposed and demonstrated experimentally. The method employs a net gain-loss measurement that uses the 4I(13/2) level pumping of the EDF and the McCumber relation. A formula used to obtain the quotient of the gain and loss coefficient from the net gain-loss measurement is derived to determine the parameter in the McCumber relation. It is confirmed that the gain coefficient spectrum of an EDF estimated with the method coincides with the value estimated using a conventional net gain-loss measurement that employs the 4I(11/2) level pumping. The method is successfully applied to an erbium/ytterbium-doped fiber, for which it is impossible to perform a conventional net gain-loss measurement with pumping at the 4I(11/2) level of erbium ions because of the absorption transition of ytterbium ions from 2F(7/2) to 2F(5/2) levels.
The relative concentration of erbium ions undergoing nonradiative relaxation from the metastable to the ground level is measured in aluminosilicate glass fibres doped with erbium ions at concentration between 3 × 10 18 and 10 20 cm -3 . The dependence of the fraction of such ions on the Er 3+ concentration is determined for fibres containing different amounts of aluminium oxide in a core. It is shown that the fraction of erbium ions not involved in amplification substantially decreases with increasing the Al 2 O 3 concentration. It is found that clustering leads to a considerable decrease in the gain in heavily Er 3+ -doped active fibres. The dependence of the quantum efficiency of a fibre amplifier on the erbium ion concentration is obtained based on the measurements performed. This dependence can be used for optimising the parameters of erbium-doped fibre amplifiers.
Considering cooperative up-conversion,cross-relaxation and excited state absorption,the rate equations of eight energy levels were founded for Yb-Er co-doped Al 2O 3 materials.The functions of coefficients of cooperative up-conversion,cross-relaxation and excited state absorption varied along with the concentrations of ytterbium and erbium were built phenomenologically.The relationship among 1.53 μm photoluminescence intensity,doped concentration,and pump power were numerically simulated for Yb-Er co-doped Al 2O 3 film.The results show that there is the optimum Yb-doped concentration when Er-doped concentration and pump power are constant.The optimal Yb∶Er ratio will decrease following with increase of pump power under the fixed Er-doped concentration,and the optimal Yb∶Er ratio will also decrease following with increase of Er-doped concentration when pump power is fixed.The computed results are in good agreement with the experiment surveys.