Research On Novel Fused Biconical All Fiber Interleaver

With the rapid development of high speed railway, a nationwide rail all optical communication network will be built, which can ensure large capacity and high reliability and high quality information transmission in the future high-speed railway, which has important strategic significance for the development of railway. In Each main node in the DWDM network involves a lot of optoelectronic components and various function modules. Optical filter represents a big class of key photonic components. Thus, it is practical and meaningful to select Interleaver as the title of this dissertation.In the paper, some theoretical models of Interleaver based on FMZI were put forward, the transmission expression on Interleaver were achieved by using the optical coupling matrix theory, then the characteristic simulation and theoretical analysis and experimental verification were done, and some valuable results and conclusions were summed up, which was meaningful for the device further practical design and related technical exploration. The main research topics in this paper were flat-top FMZI Interleaver and unequal passband FMZI Interleaver and three channel FMZI Interleaver. The research contents were stated indetail as follows:Design and theoretical analysis based on the traditional2x2FMZI Interleaver. The transmission characteristics of2x2FMZI was studied, then cascaded2×2FMZI flat-top Interleaver and unequal passband FMZI Interleaver were proposed and the transmission expressions on the two Interleaves were achieved, and the characteristic simulation and theoretical analysis were done, the results showed when parameters were some value, devices had flat-top passband and high isolation spectrum.Design and theoretical analysis based on the novel3×2FMZI Interleaver. The traditional2x2FMZI was improved through a introduced3×3fiber coupler, then a novel3×2FMZI was achieved. The feasibility of the novel3x2FMZI was verificated by using the optical coupling matrix theory, then cascaded novel3×2FMZI flat-top FMZI Interleaver and unequal passband FMZI Interleaver were proposed, The transmission expressions on the two Interleaves were achieved, and the characteristic simulation and theoretical analysis were done, the results showed that when parameters were some value, the equal passband device had flat-top passband and high isolation spectrum, and the unequal passband device had unequal passband and high isolation spectrum, and these devices were not sensitive to the coupling coefficient of the couplers.Design and theoretical analysis based on the novel3×3FMZI Interleaver. The traditional2x2FMZI was improved through two introduced3×3fiber couplers, then a novel3x3FMZI was achieved. then novel3x3FMZI and cascaded novel3x3FMZI three channel Interleaver were proposed, The transmission expressions on the two Interleaver were achieved, and the characteristic simulation and theoretical analysis were done, the results showed:when parameters were some value, the three output ports spectrum of the devices were same and symmetry, and which had low sidelobe peak channel power, and high isolation, good stability, and when structure parameter of the device deviated from the optimal value, the output spectrum of the device was also ideal.