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Design, Simulating And Analyses Of An Arrayed-Waveguide Grating Wavelength Division Multiplexer

Posted on:2003-07-09Degree:MasterType:Thesis
Country:ChinaCandidate:Y P LiFull Text:PDF
GTID:2168360062986308Subject:Condensed matter physics
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With the development of ISDN, communication transmission with large capacity and multielement makes much more demands on optical communication system. As a result, wavelength division multiplexing (WDM) technology by which light with multiwavelength can propagate through single optical fibre is given more and more attention.Today, the most common multi/demultiplexers have fallen into three categories: thin-film filters, fiber bragg gratings and planar waveguide multi/demultiplexers. AWG, is the research object in this thesis. As an planar waveguide component, it has many advantages, such as its small size, lower cost per port, the relatively low insertion losses, potential for volumn production and integration with active elements.As for waveguide components such as AWGs, beam propagation method (BPM) and transparent boundary condition (TBC) are powerful tools to do computer-aided modeling, giving direct results. By using BPM, the problem is reduced from a second-order boundary value problem requiring iteration or eigenvalue analysis to a first-order initial-value problem that can be solved by simple "integration" along the propagation direction. The simplifications offered by BPM reduce the computational complexity of most problems and speed up the computational process for many. The TBC algorithm simulates that wave near the boundaries is plane wave, and its amplitude and direction are decided by trial and error.In this thesis, the operation principle of an AWG is introduced and the structure parameters of 8x8 AWG with its central wavelength 1550.12/7/n and channel spacing 3.2nm are designed by discussing the crosstalk to neighboring waveguide, the insertion losses and losses equal, etc. This thesis employs the waveguide theories to analyze the slab waveguide and the arrayed waveguide, and offers the distributions of stable optical fields. BPM and TBC are also used to simulate the 8x8 AWG. Three dimensional waveguide is simplified in this thesis, and it is dealt with as two dimensional waveguide. It can be seen from the analyses that light withdifferent wavelength has different losses when it propagates in different waveguide and light with same wavelength also has different loss when it propagates in different waveguide. This thesis offer an idea that energy equaling and compensation components are to be put between the first slab waveguide and the arrayed-waveguide in the AWG in order to get better performance of the AWG demultiplexer. At the same time, the simulating results prove that the parameters of the AWG designed in this thesis are reasonable and a problem is offered that the insertion losses of different channels of the AWG demultiplexer are different.
Keywords/Search Tags:arrayed-waveguide grating, wavelength division multiplexer, beam propagation method, transparent boundary condition, optical field distribution
PDF Full Text Request
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