Analysis And Research On Bandwidth Extension Methods Of Optical Fiber Communication Systems

The emergence of optical fiber communication is an important revolution in the history of communications. In recent years research on optical fiber communication systems has become one of the hot areas of research communications.Mainly the development of optical fiber communication medium for the transmission from the multi-mode fiber to the development of single-mode fiber,850nm short wavelength window into the development of long wavelength 1550nm window. With the continuous development of optical fiber communication, it is growing demand for bandwidth, how to extend the bandwidth of optical fiber communication technology has become key to the development issues. Dispersion is very small because, in theory, the bandwidth of single-mode fiber can be understood as infinite; and large multi-mode fiber dispersion, which directly limits the bandwidth of multimode fiber, so the bandwidth expansion for multi-mode fiber is very important to study,This study mainly two aspects:First, for single-mode fiber, this study of the wavelength division multiplexing (WDM) technology, system components and principle of the wavelength conversion in WDM system, the role of the system by reducing the blocking probability to improve network performance; the second is for multi-mode optical fiber, the mode group diversity of multiplexing (MGDM) and subcarrier multiplexing (SCM) principles of both techniques, the former paper, a 2×2 design of the system model pilot signal with a mixture of two analog signals to transmit, for the latter designed in this paper, a sub-carrier frequency of 3GHz system to transmit different digital signal, through the use of software simulation Optisystem get some meaningful results, these results that the bandwidth of multimode fiber for expansion they are two effective signal multiplexing method.