Analysis of extraneous self-images with weak-guiding multimode interference structure for wavelength MUX

Jong-Kyun Hong; Jong-In Jung; Jung-Ha Kim; Sang-Sun Lee

doi:10.1117/12.698215

14 February 2007 Analysis of extraneous self-images with weak-guiding multimode interference structure for wavelength MUX

Jong-Kyun Hong, Jong-In Jung, Jung-Ha Kim, Sang-Sun Lee

Author Affiliations +

Proceedings Volume 6476, Optoelectronic Integrated Circuits IX; 64760D (2007) https://doi.org/10.1117/12.698215
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

This paper would like to discuss a self-imaging phenomenon in a multimode interference (MMI) coupler. From experiment, different self-images, which are undefined in MMI theory, are observed. These undefined self-images are named 'extraneous self-images' (Ex_SI) out of convenience. In order to estimate the applicability of the Ex_SI, the characteristics of both the 0-dB self-images (SI), which is defined in MMI theory, and the Ex_SIs are compared and analyzed through simulation and experiment. The results show that the Ex_SI has an imaging period that is the same as the 0-dB SI and that the excess loss and the extinction ratio of the Ex_SI improve more than that of the 0-dB SI, as the imaging period increases. Also, this paper introduces the wavelength multiplexer (MUX) for the wavelengths of 1310 nm and 1550 nm using the Ex_SI phenomenon. The optimum length of the multimode waveguide, with a width of 18 microns, is confirmed as a 3670 um wavelength MUX. For wavelengths of 1310 nm and 1550 nm, the excess losses are measured as -0.4 dB and -0.45 dB, respectively, while the extinction ratios are measured as 16.9 dB and 19.7 dB, respectively.

Citation Download Citation

Jong-Kyun Hong, Jong-In Jung, Jung-Ha Kim, and Sang-Sun Lee "Analysis of extraneous self-images with weak-guiding multimode interference structure for wavelength MUX", Proc. SPIE 6476, Optoelectronic Integrated Circuits IX, 64760D (14 February 2007); https://doi.org/10.1117/12.698215

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