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Authors: H. Yu, W. Bogaerts
Title: An Equivalent Circuit Model of the Traveling Wave Electrode for Carrier-depletion-based Silicon Optical Modulators
Format: International Journal
Publication date: 2/2012
Journal/Conference/Book: Journal of lightwave technology
Volume(Issue): 30(11) p.1602-1609
DOI: 10.1109/jlt.2012.2188779
Citations: 102 ( - last update: 14/7/2024)
50 (OpenCitations - last update: 10/5/2024)
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We propose an equivalent circuit model for the coplanar waveguide (CPW) which serves as the traveling wave electrode to drive carrier-depletion-based silicon modulators. Conformal mapping and partial capacitance techniques are employed to calculate each element of the circuit. The validity of the model is confirmed by the comparison with both finite-element simulation and experimental result. With the model we calculate the modulation bandwidth for different CPW dimensions and termination impedances. A 3 dB modulation bandwidth of 15 GHz is demonstrated with a traveling wave electrode of 3 mm. The calculation indicates that by utilizing a traveling wave electrode of 2 mm we can obtain a 3 dB modulation bandwidth of 28 GHz.

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