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Optimization of the rf circuit for wide‐bandwidth cross‐linked polymer electro‐optic modulators
Author(s) -
Nguyen Hung,
Ponchak George E.,
Kunath Richard,
Bohman Donna,
Varaljay Nick
Publication year - 1996
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19961005)13:2<90::aid-mop10>3.0.co;2-d
Subject(s) - coplanar waveguide , microstrip , microwave , materials science , optoelectronics , transmission line , electrode , bandwidth (computing) , electrical impedance , waveguide , radio frequency , characteristic impedance , optics , electronic engineering , electrical engineering , engineering , telecommunications , physics , quantum mechanics
A transmission‐line theory approach that includes the complex propagation constant of the microwave electrodes and the impedance match between the electrode and the rf source and load is used to analyze the bandwidth of polyamide optical modulators. The analysis is then applied to an electro‐optic modulator that has microstrip transmission lines placed directly over an optical waveguide buried in the polyamide substrate. The modulator is designed with coplanar waveguide (CPW) input and output contacts for rf characterization. The transition between the microstrip electrode and the CPW lines is presented. In addition, the processing techniques that yield polyamide side‐wall profiles that are highly suited for transitioning from the CPW and the microstrip are presented. Finally, rf measurements of the complete microwave electrode are presented. © 1996 John Wiley & Sons, Inc.