High performance evanescent edge coupled waveguide unitraveling-carrier photodiodes for >40-gb/s optical receivers

• Published in: IEEE photonics technology letters Vol. 16; no. 2; pp. 584 - 586
• Main Authors: Achouche, M., Magnin, V., Harari, J., Lelarge, F., Derouin, E., Jany, C., Carpentier, D., Blache, F., Decoster, D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-02-2004; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Beams (radiation); Coatings; Genetic algorithms; Indium phosphide; Mirrors; Optical coupling; Optical receivers; Optical saturation; Optical surface waves; Optical waveguides; Optimization methods; Photocurrent; Photodiodes; Photoelectric effect; Photonics; Wave propagation; Waveguides
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2003.821082

We have demonstrated a low-cost high-bandwidth and high-responsivity evanescent waveguide unitravelling-carrier photodiode (PD) fabricated using all 2-in InP processing including on-wafer mirrors and coating. Optimization of the optical input waveguide was made using the method of the genetic algorithm associated with a beam propagation method. Optical fiber coupling to the PD is based on a diluted multimode waveguide allowing simple material epitaxial growth. The fabricated PDs exhibit simultaneously 0.76-A/W responsivity at 1.55 μm, >50-GHz bandwidth, and more than 22-mA average saturation photocurrent at 50 GHz. The light polarization dependence is less than 0.1 dB.