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Acta Physica Sinica

Er3+-DOPED OPTICAL FIBER SOLITON AMPLIFIER (II)——OPTIMAL PUMPING

ZHAO YANG, Shuwen Yang

Published Jan 1, 1994• 0 citations
Publisher

Abstract

摘要 由文献［１］所给Ｅｒ3+掺杂光纤的孤子传输放大方程，对分布放大情况，给出透明传输时的最佳泵浦功率。将其与实验结果比较，证明理论与实验符合很好。对考虑激发态吸收时的最佳泵浦的研究指出，激发态吸收将严重消耗泵浦功率，提高基态量子转移效率可减小激发态吸收的影响。 Abstract From the amplification equation of solitons propagating in Er3+-doped optical fibers given in reference[1]，this paper gives the optimal pumping power for the transparent transmission in the case of distributed amplification. It is shown that the theory is in good agreement with experimental results given previously. The investigation on the optimal pumping in which excited-state absoption is considered indicates that the excited-state absoption seriously damp the pump power, but increasing the auantum transition efficiencv of around-state, can weaken the influence of the excited-state absoption. 作者及机构信息 赵阳, 杨淑雯 1. 深圳大学新技术研究中心 Authors and contacts ZHAO YANG, YANG SHU-WEN 1. 深圳大学新技术研究中心 参考文献 施引文献

DOI
10.7498/aps.43.1281

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Er 3+ 掺杂光纤孤子放大器(II)——最佳泵浦

赵阳, 杨淑雯

由文献［１］所给Ｅｒ 3+ 掺杂光纤的孤子传输放大方程，对分布放大情况，给出透明传输时的最佳泵浦功率。将其与实验结果比较，证明理论与实验符合很好。对考虑激发态吸收时的最佳泵浦的研究指出，激发态吸收将严重消耗泵浦功率，提高基态量子转移效率可减小激发态吸收的影响。

Acta Physica Sinica•Aug 20, 1994•0 citations
摘要 由文献［１］所给Ｅｒ3+掺杂光纤的孤子传输放大方程，对分布放大情况，给出透明传输时的最佳泵浦功率。将其与实验结果比较，证明理论与实验符合很好。对考虑激发态吸收时的最佳泵浦的研究指出，激发态吸收将严重消耗泵浦功率，提高基态量子转移效率可减小激发态吸收的影响。 Abstract From the amplification equation of solitons propagating in Er3+-doped optical fibers given in reference[1]，this paper gives the optimal pumping power for the transparent transmission in the case of distributed amplification. It is shown that the theory is in good agreement with experimental results given previously. The investigation on the optimal pumping in which excited-state absoption is considered indicates that the excited-state absoption seriously damp the pump power, but increasing the auantum transition efficiencv of around-state, can weaken the influence of the excited-state absoption. 作者及机构信息 赵阳, 杨淑雯 1. 深圳大学新技术研究中心 Authors and contacts ZHAO YANG, YANG SHU-WEN 1. 深圳大学新技术研究中心 参考文献 施引文献
"Doping a part of the optical fiber core by (Er3+ ) ions in presence of external pumping power will lead to form the erbium-doped fiber amplifier (EDFA).The performance of this optical amplifier depends on (the power and the wavelength of the pumping laser, the power and wavelength of the input signal, amplifier length, ion concentration). These parameters will affect the characteristics of EDFA such as amplifier gain, gain saturation, noise figure and output power. However, these characteristics can be determined by solving the EDFA propagation and rate equations. The solution of these equations of two-level laser medium can be done numerically. In this paper, we are proposed a novel method to solve these equations. The reconstructed results are perfectly coincided the well known numerical results.
Doping a part of the optical fiber core by (Er3+ ) ions in presence of external pumping power will lead to form the erbium-doped fiber amplifier (EDFA).The performance of this optical amplifier depends on (the power and the wavelength of the pumping laser, the power and wavelength of the input signal, amplifier length, ion concentration). These parameters will affect the characteristics of EDFA such as amplifier gain, gain saturation, noise figure and output power. However, these characteristics can be determined by solving the EDFA propagation and rate equations. The solution of these equations of two-level laser medium can be done numerically. In this paper, we are proposed a novel method to solve these equations. The reconstructed results are perfectly coincided the well known numerical results.
In this paper, we propose a new pumping scheme—a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber based on the theory of coherent population oscillation. While realizing slow light transmission, the loss of output signal light power is reduced. Using numerical simulation, we compare the effects of a single fiber without pumping, a 980 nm single pumping single fiber, and a dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber on signal light intensity loss coefficient τ and maximum time delay with the increase of input signal light power. The results show that the signal light intensity loss coefficient τ of the three structures decreases gradually with the increase of input signal light power. However, the transmission of lower signal light intensity loss coefficient τ=0.0823 and a larger time delay of 0.15 ms can be obtained under the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber. On the basis of the dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber, the signal light intensity loss coefficient τ decreases gradually with the increase of pump ratio M (M=P1480∶P980) and the decrease of length ratio N (N=L2∶L1; L1 and L2 represent the length of the first and second cascaded optical fibers, respectively). Moreover, we compare the effects of ion density of the Er3+-doped optical fiber on the time delay of three structures. The dual-frequency laser-pumped cascade structure of Er3+-doped optical fiber can provide a larger time delay and smaller signal light intensity loss coefficient τ at low ion density of the Er3+-doped optical fiber.
Abstract—In this article the details of Erbium doped Fiber Amplifier (EDFA) in presence of Silicon nanocrystal (Si-Nc) is investigated. In this analysis Si-Nc and Er ions in matrix of fiber are assumed two and five levels respectively. For this structure rate equation for transient and steady state analysis is considered. The range of Er (+3) concentration and pump intensity at 488 nm are considered [10 17 − 10 21]1/cm 3 and [10 17 − 10 23] photon/cm 2 · sec respectively in this paper. Based on numerical simulation of this problem we observed that with increasing of concentration of the Si-Nc the fiber length for given optical gain is decreased. For example in the case of 40 dB optical gain, we calculated fiber length to be 1.1 × 10 5 cm without Si-Nc and 5 × 10 2 cm for σCCa = 1 × 10 −17 cm 2 (confined carrier absorption cross-section) and 5 cm for σCCa =1 × 10 −19 cm 2 respectively. Our simulations show that for second level with increasing pump intensity the population rise and fall times are decreased. But, for third level the population rise time is decreased and fall time is depends to level of Er ion interactions. We observed that with increasing Er ions optical net gain is increased and finally has a maximum. After this special value of Er ions because of increasing in interaction between ions the net gain finally begin to decrease. In this analysis we let to Er ions have inhomogeneous distribution. Also, we observed that in this case with increasing of the distribution peak, the net gain is increased, interaction between ions is increased, the coupling coefficient to the Si-Ncs is increased and losses due to Si-Ncs are decreased. Finally effect of Kexiton (maximum number of exciton in single Si-Nc) on amplification process is considered and we observed that in the case of Kexiton = 2 the optical gain considerably and introduced losses due to Si-Nc are increased. 28 Rostami and SalmanOgli 1.