Optimal design on wideband directional coupler |
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Authors: | YAN Jin-kui SHA Zheng-guo XU De-ming |
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Institution: | Key Laboratory of specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200072, P. R. China |
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Abstract: | Combining the modified Bethe small holes coupling theory with McDonald thickness theory and field averaging correction factor,
it is accurate to design the weak coupling waveguide directional coupler. While the coupling is tight, the decrease of the
field strength in the main waveguide caused by aperture should not be neglected. For a −6 dB directional coupler is described
in this article, the theoretical value of coupling is good agree to the simulation value, by simulated and optimized with
the professional software computer simulation technology (CST). In the designed waveband, the error of coupling between theoretical
value and simulating one is less than 0.25 dB. The error of coupling between simulation value and designed value is less than
0.5 dB. To improve the isolation, some spaces between two adjacent holes are turned from the traditional ? centre guided wavelength.
The performance of isolation has 5 dB improvement, and length of the coupling area is only 51.06 mm. |
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Keywords: | coupling isolation aperture coupling computer simulation technology (CST) |
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