Study On Optical Add-drop Multiplexing Based On FBG In WDM Systems

Optical Add-Drop Multiplexer (OADM) is one of the key devices of WDM optical network.This paper summarizes the current structures of OADM, and focuses on the OADM based on fibergrating and circulator. A novel structure of OADM based on fiber grating and circulator is proposedin this paper. The main research contents come as follows:1) This paper researches on the coupled mode theory and the tuning techniques of fibergrating. The method of the use of magnetic force to strain-tune FBG is also introduced.2) Four structures of OADM based on fiber grating and circulator are studied and simulated,and the results of the simulations of four structures of OADM are analyzed in this paper.They include a tunable FBG OADM with the cantilever beam tuning scheme, acombination OADM with FBG and couplers,a reconfigurable OADM using two FBGs anda hybrid reconfigurable OADM using Mach-Zehnder interferometer (MZI) and FBG.3) This paper proposes a novel structure of OADM based on fiber Bragg grating .The newOADM structure has the advantages of simple, flexible to use and low insertion loss. Fullload and less load simulation experiments for this novel structure of OADM areresearched and analyzed.