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3 October 2006 Pseudo-self-imaging phenomenon in multimode waveguide and its application
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Proceedings Volume 6351, Passive Components and Fiber-based Devices III; 635118 (2006)
Event: Asia-Pacific Optical Communications, 2006, Gwangju, South Korea
The self-image profiles in a multimode waveguide can be estimated from the phase relations of the guided-modes. However, in MMI theory, the propagation constants of each guided-mode are defined as a perfectly confined condition. Because of the effect of the Goos-Haenchen shift, there are large phase differences for each guided-mode between the predictions of MMI theory and the actual phenomena. Because the relative phases of the guided-modes are not the same as the theoretical ones in a multimode waveguide, it is possible that an undefined self-image can be produced. In this paper, such a phenomenon is called the 'pseudo-self-imaging phenomenon'. This phenomenon can be observed in both the simulation and the experimental results. The excess loss has been measured, and the results are the same as -0.5dB for both the 1st 0-dB self-image and the 1st pseudo-self-image. These results may have been occurred by the phase mismatch of the guided-modes. The extinction ratios are also measured, and the results are 15.5dB for the 0-dB self image and 16.2dB for the pseudo-self-image. From the result, it is shown that the pseudo-self-image is formed after the 0-dB self-image and the pseudo-self-images' intensity can be higher then the 0-dB self-images.
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Jong-Kyun Hong and Sang-Sun Lee "Pseudo-self-imaging phenomenon in multimode waveguide and its application", Proc. SPIE 6351, Passive Components and Fiber-based Devices III, 635118 (3 October 2006);

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