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Normal-mode small-signal analysis of traveling-wave directional couplers

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2 Author(s)
H. Chung ; Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA ; W. S. C. Cahng

The small-signal frequency responses of the 1×2 and 2×2 directional coupler traveling-wave modulators are analyzed in closed forms including the effect of both the optical/microwave velocity mismatch and microwave loss. When the microwave loss is negligible, the small-signal bandwidths of 1×2 and 2×2 directional coupler traveling-wave modulators are 20 and 28%, respectively, larger than that of an interferometric modulator with the same electrode length. However, when the microwave loss is large, the 1×2 coupler has a larger bandwidth

Published in:

IEEE Journal of Quantum Electronics  (Volume:28 ,  Issue: 5 )