Study Of Microring-Based All-Pass Filters

With the rapid development of communication technology era, Dense Wave Division Multiplexing (DWDM) is being utilized to construct a high-capacity optical fiber communication. Modern optical communications become higher capacity, and develop more rapidly. The devices in integrated optics will be modularized. The very large scale of integration on photonic circuits (VLSI-PCs) is one of development directions of the optical communications in the future. In recent years, people focus on the implement of VLSI-PCs. The microring resonators as a basic module with a lot of merits in VLSI-PCs, have great potential for development.Polymer is a kind of cheap applicable material, and is flexible in constructing structures. In recent years, the researches on polymer develop very rapidly. It has the advantages of high thermal-optical ratio and low heat conduction ratio. In this paper, the proposal we present is using the polymer processes and ion exchange processes to manufacture the wave guide devices.Firstly, the signal processing methods are utilized to establish the mathematic module of microring resonators, then we deduce out microring-based all-pass filter frequency response and analyze its characteristics. A detailed analysis about the characteristics of dispersion compensation is presented. The microring is a kind of small and compact structure which is suitable to fabricate multi-path dispersion compensator. Then we analyze improved Mach-Zehnder (MZ) modulator based on microring structures. We present the design scheme of microring-based MZ modulators, which is under the condition with loss or without loss. In the scheme, the modulators are eliminated 2nd order and 3 rd order non-linear effects simultaneously. Then a general formula which is using multi-ring to improve the performance of MZ modulators, is demonstrated. And the analytic expressions are presented for the design.Secondly, due to the alterability of organic polymer, an instrument is built tomeasure the film parameters. The instrument utilizes the prism coupling method to measure the refractive index and thickness of the polymeric film.Finally we explore the process of polymer materials and the ion exchange process. The scheme of the waveguides fabricated by combining the two technologies is presented.