Chaotic dynamics in erbium-doped fiber ring lasers
Chaotic dynamics in erbium-doped fiber ring lasers
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DOI：
10.1103/physreva.60.2360
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发表时间：
1999-09-01
影响因子：
2.9
通讯作者：
Lewis, CT
中科院分区：
文献类型：
--
作者：
Abarbanel, HDI;Kennel, MB;Lewis, CT
混沌振荡的掺稀土光纤环形激光器（DFRL）可以提供一种有吸引力的方式来利用光通信系统中可用的宽带宽。最近的理论和实验研究已经成功地显示了将信息调制到宽带混沌振荡上，沿沿着光纤传输该信号，并在接收器处解调信息的技术。我们开发了一个DFRL的理论模型，并讨论了一个有效的数值模拟，其中包括固有的线性和非线性诱导双折射，横向偏振，群速度色散，和有限的增益带宽。我们首先分析了一个配置与一个单环的光纤含有掺杂光纤放大器，然后，由罗伊和VanWiggeren建议，我们研究了一个系统与两个环的光纤-一个单独的无源光纤。将掺铒放大器连接到其自身的无源光环的典型往返时间为200 ns，因此需要大约10（5）次往返才能看到该激光系统中粒子数反转动力学的缓慢效应。在大量的往返过程中，像GVD和Ken非线性这样的物理效应可能会积累并主导动力学，这些物理效应在我们的频率和激光功率下可能会很小。我们从我们的模型表明，混沌振荡的环形激光器的参数相关的掺铒光纤产生的非线性肯效应，而不是从原子布居数反转和辐射动力学之间的相互作用。[S1050-2947（99）08607-2]。
Chaotically oscillating rare-earth-doped fiber ring lasers (DFRLs) may provide an attractive way to exploit the broad bandwidth available in an optical communications system. Recent theoretical and experimental investigations have successfully shown techniques to modulate information onto the wide-band chaotic oscillations, transmit that signal along an optical fiber, and demodulate the information at the receiver. We develop a theoretical model of a DFRL and discuss an efficient numerical simulation which includes intrinsic linear and nonlinear induced birefringence, both transverse polarizations, group velocity dispersion, and a finite gain bandwidth. We analyze first a configuration with a single loop of optical fiber containing the doped fiber amplifier, and then, as suggested by Roy and VanWiggeren, we investigate a system with two rings of optical fiber-one made of passive fiber alone. The typical round-trip time for the passive optical ring connecting the erbium-doped amplifier to itself is 200 ns, so approximate to 10(5) round-trips are required to see the slow effects of the population inversion dynamics in this laser system. Over this large number of round-trips, physical effects like GVD and the Ken nonlinearity, which may appear small at our frequencies and laser powers via conventional estimates, may accumulate and dominate the dynamics. We demonstrate from our model that chaotic oscillations of the ring laser with parameters relevant to erbium-doped fibers arises from the nonlinear Ken effect and not from interplay between the atomic population inversion and radiation dynamics. [S1050-2947(99)08607-2].