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Proceedings Paper

Improved performance of traveling wave directional coupler modulator based on electro-optic polymer
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Paper Abstract

Polymer based electro-optic modulators have shown great potentials in high frequency analog optical links. Existing commercial LiNibO3 Mach-Zehnder modulators have intrinsic drawbacks in linearity to provide high fidelity communication. In this paper, we present the design, fabrication and characterization of a traveling wave directional coupler modulator based on electro-optic polymer, which is able to provide high linearity, high speed, and low optical insertion loss. A silver ground electrode is used to reduce waveguide sidewall roughness due to the scattering of UV light in photolithography process in addition to suppressing the RF loss. A 1x2 multi-mode interference 3dB-splitter, a photobleached refractive index taper and a quasi-vertical taper are used to reduce the optical insertion loss of the device. The symmetric waveguide structure of the MMI-fed directional coupler is intrinsically bias-free, and the modulation is obtained at the 3-dB point regardless of the ambient temperature. By achieving low RF loss, characteristic impedance matching with 50Ω load, and excellent velocity matching between the RF wave and the optical wave, a travelling wave electrode is designed to function up to 62.5GHz. Domain-inversion poling with push-pull configuration is applied using alternating pulses on a 2-section directional-coupler to achieve a spurious free dynamic range of 110dB/Hz2/3. The 3-dB electrical bandwidth of device is measured to be 10GHz.

Paper Details

Date Published: 23 February 2012
PDF: 11 pages
Proc. SPIE 8267, Optoelectronic Interconnects XII, 82671B (23 February 2012); doi: 10.1117/12.907744
Show Author Affiliations
Xingyu Zhang, The Univ. of Texas at Austin (United States)
Beomsuk Lee, The Univ. of Texas at Austin (United States)
Che-Yun Lin, The Univ. of Texas at Austin (United States)
Alan X. Wang, Oregon State Univ. (United States)
Amir Hosseini, Omega Optics, Inc. (United States)
Xiaohui Lin, The Univ. of Texas at Austin (United States)
Ray T. Chen, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 8267:
Optoelectronic Interconnects XII
Alexei L. Glebov; Ray T. Chen, Editor(s)

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