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Advances in Optical Amplifiers Part 10

Tham khảo tài liệu 'advances in optical amplifiers part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 256 Advances in Optical Amplifiers We also put into evidence the existence of a strong interdependence between active medium parameters having important role in the designing of the erbium laser systems with given functional parameters. We demonstrated the stable nonchaotic operation of the analyzed laser systems and the modulation performance of them using the communications theory methods. For the erbium doped fiber laser we explained the complex dynamics of this type of device by simulating the time dependence of the output power correlated with the corresponding changes in the populations of the implied levels. Another author s numerical simulations refers to nonlinear effects in optical fibers systems Sanchez et al. 1995 Ninulescu Sterian 2005 Ninulescu et al. 2006 . Self - pulsing and chaotic dynamics are studied numerically in the rate equations approximation based on the ion - pair formation phenomena Sanchez et al. 1993 Sterian Ninulescu 2005 Press et al. 1992 . The developed numerical models concerning the characterization and operation of the EDFA systems and also of the laser systems both of the crystal type or fiber type realized in Er3 doped media and the obtained results are consistent with the existing data in the literature. That was possible due to the valences of the computer experiment method which permits a complex study taking into account parameters intercorrelations by simulating experimental conditions as have been shown. The used fourth order Runge - Kutta method for the numerical simulation demonstrates the importance of the computer experiments in the designing improving and optimization of these coherent optical systems for information processing and transmission Stefanescu et al. 2000 2002 2005 Sterian 2002 Sterian 2007 . Some new feature of the computer modeled systems and the existence of new situations have been put into evidence for designers utility in different applications Petrescu 2007 Sterian 2008 . Our results are important .