By Le Nguyen Binh
Carefully dependent to supply functional wisdom on basic matters, Optical Fiber Communications platforms: idea and perform with MATLAB® and Simulink® Models explores complex modulation and transmission thoughts of lightwave verbal exchange structures. With insurance starting from basic to fashionable facets, the textual content provides optical communique strategies and functions, utilizing unmarried mode optical fibers because the transmission medium. With MATLAB and Simulink versions that illustrate tools, it provides a deeper realizing of destiny improvement of optical platforms and networks.
The e-book starts with an outline of the advance of optical fiber communications expertise during the last 3 many years of the 20th century. It describes the optical transmitters for direct and exterior modulation strategy and discusses the detection of optical signs lower than direct coherent and incoherent reception. the writer additionally covers lumped Er:doped and disbursed Roman optical amplifiers with wide types for the amplification of signs and structuring the amplifiers at the Simulink platform. He outlines a layout process for optically amplified transmission structures coupled with MATLAB Simulink types, together with dispersion and attenuation finances technique and simulation thoughts. The booklet concludes with insurance of complex modulation codecs for lengthy haul optical fiber transmission structures with followed Simulink models.
Although many books were written in this subject during the last 20 years, so much of them current in basic terms the idea and perform of units and subsystems of the optical fiber communications structures within the fields, yet don't illustrate any machine types to symbolize the genuine sensible elements of engineering perform. This publication fills the necessity for a textual content that emphasizes functional computing types that make clear the habit and dynamics of the devices.
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Additional info for Optical Fiber Communications Systems: Theory and Practice with MATLAB® and Simulink® Models (Optics and Photonics)
5 Nonlinear Optical Effects In this section, the nonlinear effects are described. These effects play important roles in the transmission of optical pulses along single-mode optical fibers. The nonlinear effects can be classified into three types: the effects that change the refractive index of the guided medium due to the intensity of the pulse, the self-phase modulation (SPM); the scattering of the lightwave to other frequency-shifted optical waves when the intensity reaches over a certain threshold, the Brillouin and Raman scattering phenomena; and the mixing of optical waves to generate a fourth wave, the degenerate four-wave mixing.
The refractive index difference term is usually much <1. The V parameter can be normally approximated by a simpler expression. 17 show that the field Ey for TE modes and Hy for TM modes are a linear combination of cos(ux/a) and sin(ux/a) inside the core layer (|x| ≤ a) and an exponential decay form on outside (|x| > a) with exp(−vx/a) for x > a and exp(vx/a) for x < −a. We therefore have two distinct cases: the even TE modes and the odd TE modes. Their solutions are given as follows. 20) other Hx and Hz can also be expressed in similar expressions.
This is a very important point that one must not design the optical fiber with a near unit value of the V parameter. In practice, we observe that the spot size is large but finite (observable). 5, the spot size becomes large and this will be investigated in detail in Chapter 3. 7). 405 is the first zero of the Bessel function J0(u). 0. Experimental observation shows that optical fiber can still support only one mode. 0 or less to design a single-mode optical fiber. The V parameter is inversely proportional to the optical wavelength.