High-Speed Miniaturized Photodiode and Parallel-Fed Traveling-Wave Photodetectors Based on InP

• Published in: IEEE journal of selected topics in quantum electronics Vol. 13; no. 1; pp. 15 - 21
• Main Authors: Beling, A., Bach, H.-G., Mekonnen, G.G., Kunkel, R., Schmidt, D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2007; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bandwidth; Devices; Electric power generation; High speed; High speed optical techniques; Impedance; Indium phosphide; InP; integrated opto-electronic circuit; Optical devices; Optical surface waves; Optical waveguides; p-i-n photodiode (PD); Photodetectors; Photodiodes; Power generation; Power splitters; Quantum electronics; traveling-wave photodetector (TWPD)
• ISSN: 1077-260X; 1558-4542
• DOI: 10.1109/JSTQE.2006.885331

A periodic parallel-fed traveling-wave photodetector (TWPD) with monolithically integrated power splitter is presented. The device exhibits an impedance match to the 50-Omega environment as well as a velocity match between the optical and electrical signals and shows a 3-dB bandwidth up to 85 GHz. The electrical output power reaches +10 dBm at 10 GHz. The device is based on evanescently coupled low-capacitance waveguide-integrated p-i-n photodiodes (PDs) with optimized optical matching layer which reveal a bandwidth of 145 GHz when employed as a stand-alone photodetector