Numerical Model of Dual-Wavelength Erbium-Doped Fiber Ring
Laser Based on Gain-Equilibrium Method¹

Z. L. Hu, P. Xu*, and N. Jiang

School of Optoelectronic Science and Technology, National University of Defense Technology, Changsha, 410073 China

*e-mail: hbpanpan@gmail.com

Received March 6, 2012; in final form, May 24, 2012; published online September 3, 2012

Abstract—A novel numerical model of the dual-wavelength fiber ring lasers utilizing gain-equilibrium method
is presented by developing the two level, homogeneous Giles model. To obtain the simulation method, the gain
equilibrium condition is derived and modified to adapt to the iterative procedure in simulations. This condition
is confirmed by both the numerical and experimental results, which indicate that the cavity losses of both wave-
length channels play important roles in maintaining stable dual-wavelength emitting. The tolerant loss-bias is
0.05 dB in simulations and 0.4 dB in experiments, respectively. The difference between numerical and experi-
mental results reveals that the inhomogeneous linewidth broadening of EDF contributes mostly to the improved
power stability, but the loss vibrations play an important role in this effect.

DOI: 10.1134/S1054660X1210009X

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