Optical fiber communications technology has revolutionized globalcommunications. Based on classes he taught at Monash U., Australia) forstudents in computer systems engineering and telecommunicationsengineering, Binh (now at Christian Albrechts U. of Kiel, Germany)covers the principles, practices, and modeling of optically-amplifiedfiber communications systems based on single-mode fibers. Followingintroductory material on the development and basic elements of thistechnology of lightwave transmission through optical fibers, chapterstreat topics including optical transmitters, receivers, techniques togenerate advance modulation formats, detection of optical signals,stimulation techniques using MATLAB and Simulink software packages, andemerging systems and networks. The text includes numerous diagrams and aglossary of terms.
optical fiber communications systems theory and practice with matlab and simulink models le nguyen b
High speed and high capacity modern digital photonic systems require careful investigations on the theoretical performance against various impairments caused by either electronics or fiber dynamics before they are deployed in practice. Thus, the demand for a comprehensive modeling platform of photonic systems is criticalespecially a modeling platform that can structure truly the photonic sub-systems. A simulation test-bed is necessary for detailed design, investigation and verification on the benefits and shortcomings of these advanced modulation formats on the fiber-optic transmission systems Furthermore the modeling platform should take advantage of any user-friendly software platform that are popular and easy for use and further development for all the operators without requiring very much expertise in the physics of the photonic systems. Besides, this platform would offer research community of optical communication engineering a basis for extension and enhance the linkages between research groups.
Two new techniques proposed to accurately obtain the pdf of the detected electrical signal in optical communications include the mixture of multi-Gaussian distributions (MGD) by implementing the expectation maximization theory (EM) and the generalized Pareto distribution (GPD) of the generalized extreme values (GEV) theorem. These two techniques are well-known in fields of statistics, banking, finance, meteorology, etc. The implementation of required algorithms is carried out with MATLAB functions. Thus, these novel statistical methods offer a great deal of flexibility, convenience, fast-processing while maintaining the errors in obtaining the BER within small and acceptable limits.
As a particular case adopted for optical communications, the EM algorithm is implemented with a mixture of multi Gaussian distributions (MGD). This method offers great potential solutions for evaluation of performance of an optical transmission system with following reasons: 1) In a linear optical system (low input power into fiber), the conventional single Gaussian distribution fails to take into account the waveform distortion caused by either the ISI due to fiber CD and PMD dispersion, the patterning effects. Hence, the obtained BER is no longer accurate. These issues however are overcome by using the MGD method. 2) Computational time for implementing MGD is fast via the EM algorithm which has become quite popular.
We have illustrated the modeling of various schemes of advanced modulation formats for optical transmission systems. Transmitter modules integrating lightwaves sources, electrical pre-coder and external modulators can be modeled without difficulty under MATLAB Simulink. As the popularity of MATLAB becoming a standard computing language for academic research institutions throughout the world, the models reported here would contribute to the wealth of computing tools for modeling optical fiber transmission systems and teaching undergraduates at senior level and postgraduate research scholars. The models can integrate photonic filters or other photonic components using blocksets available in Simulink. Furthermore we have used the developed models to assess the effectiveness of the models by evaluating the simulated results and experimental transmission performance of long haul advanced modulation format transmission systems. 2ff7e9595c
Comments