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The performance of wavelength division multiplexing (WDM) in radio over fiber (RoF) systems is found to be strongly influenced by nonlinearity characteristics in side the fiber. The effect of four wave mixing (FWM) as one of the influential factors in the WDM for RoF has been studied here using Optisystem and Matlab. From the results obtained, it is found that the FWM effects have become significant at high optical power levels and have become even more significant when the capacity of the optical transmission line is increased, which has been done by either increasing the channel ...

Optical switch is a passive device that is very important in optical network communication system. It is used to switch an optical signal from one port to another one. The optical switch is fabricated using fiber optics or slab waveguide to becomes directional fiber coupler and Mach-Zehnder Interferometer (MZI). Its coupling region is disturbed by DC voltage. The different voltage between the electrodes will change the refractive index of the material, and as a result, the coupling coefficient will be changed. A directional fiber coupler switch is promising an easier technique and much...

Fiber coupler is a great utilization to combine and to split one or more optical power input and outputs. Power transfer in fiber coupler depends on the geometry of the waveguides and the coupling coefficient. Power transfers between the waveguides are calculated using matrix transfer method. By introducing power input to the one of the waveguides, assuming cross section, power propagation, and fiber axis are held constants at coupling constant coupling coefficient, it shows that coupling length of NX2, linear order NX3, and triangular NX3 fiber couplers are odd-multiple of z= /(2 ), z= /((...