High-frequency, low-crosstalk modulator arrays based on FTC polymersystems |
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Authors: | Udupa A.H. Erlig H. Tsap B. Chang Y. Chang D. Fetterman H.R. Hua Zhang Sang-Shin Lee Fang Wang Steier W.H. Dalton L.R. |
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Affiliation: | Dept. of Electr. Eng., California Univ., Los Angeles, CA; |
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Abstract: | A novel electro-optic polymer Furan TetraCyano Indane (FTC) has been utilised in the fabrication of low Vπ, high-speed travelling-wave Mach-Zehnder modulator arrays. The modulators were realised with microstrip transmission lines that were optimised resulting in a line loss of 3.64 dB/cm at 40 GHz. Mach-Zehnder modulators based on this design with 1.6 cm interaction length resulted in devices with Vπ<5 V and a reasonably fiat frequency response up to 40 GHz. Electrical crosstalk measurements were also conducted on adjacent modulators separated by 400 μm in a modulator array. Without the implementation of any crosstalk reduction techniques, the measurement results indicated a crosstalk level of <-40 dB in the frequency band between 0 and 40 GHz. These impressive results were a consequence of the low dielectric constant of the polymer material at microwave frequencies and of the small lateral dimensions of the microstrip lines |
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