An InGaAs-InAlAs multiple-quantum-we (MQW) electroabsorption (EA) waveguide modulator fabricated on a GaAs substrate has been designed and characterized at 1.3-mu m wavelength for microwave signal transmission on an analog fiberoptic link. The modulator structure with a lattice constant 2.5% larger than that of GaAs is grown upon a 0.7-mu m-thick three-stage compositionally step-graded In2Al1-zAs relaxed buffer. The waveguide modulator exhibits a high-electrooptic slope efficiency of 0.56 V-1, a 3-dB electrical bandwidth of 20 GHz, and a large optical saturation intensity in excess of 17 mW. These highspeed optoelectronic modulators could potentially be integrated with on-chip GaAs electronic driver circuits.
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Univ Tokyo, Inst Nano Quantum Informat Elect, Meguro Ku, Tokyo 1538505, JapanUniv Tokyo, Inst Nano Quantum Informat Elect, Meguro Ku, Tokyo 1538505, Japan
Tanabe, Katsuaki
Rae, Timothy
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Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, JapanUniv Tokyo, Inst Nano Quantum Informat Elect, Meguro Ku, Tokyo 1538505, Japan
Rae, Timothy
Watanabe, Katsuyuki
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Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, JapanUniv Tokyo, Inst Nano Quantum Informat Elect, Meguro Ku, Tokyo 1538505, Japan
Watanabe, Katsuyuki
Arakawa, Yasuhiko
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Univ Tokyo, Inst Nano Quantum Informat Elect, Meguro Ku, Tokyo 1538505, Japan
Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, JapanUniv Tokyo, Inst Nano Quantum Informat Elect, Meguro Ku, Tokyo 1538505, Japan