title: Uni-traveling-carrier variable confinement waveguide photodiodes.
abstract: Uni-traveling-carrier waveguide photodiodes (PDs) with a variable optical confinement mode size transformer are demonstrated. The optical mode is large at the input for minimal front-end saturation and the mode transforms as the light propagates so that the absorption profile is optimized for both high-power and high-speed performance. Two differently designed PDs are presented. PD A demonstrates a 3-dB bandwidth of 12.6 GHz, and saturation currents of 40 mA at 1 GHz and 34 mA at 10 GHz. PD B demonstrates a 3-dB bandwidth of 2.5 GHz, a saturation current greater than 100 mA at 1 GHz, a peak RF output power of + 19 dBm, and a third-order output intercept point of 29.1 dBm at a photocurrent of 60 mA.
authors.affiliation: Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02420, USA. klamkin@ll.mit.edu
authors.forename: Jonathan
authors.initials: J
authors.lastname: Klamkin
authors.forename: Shannon M
authors.initials: SM
authors.lastname: Madison
authors.forename: Douglas C
authors.initials: DC
authors.lastname: Oakley
authors.forename: Antonio
authors.initials: A
authors.lastname: Napoleone
authors.forename: Frederick J
authors.initials: FJ
authors.lastname: O'Donnell
authors.forename: Michael
authors.initials: M
authors.lastname: Sheehan
authors.forename: Leo J
authors.initials: LJ
authors.lastname: Missaggia
authors.forename: Janice M
authors.initials: JM
authors.lastname: Caissie
authors.forename: Jason J
authors.initials: JJ
authors.lastname: Plant
authors.forename: Paul W
authors.initials: PW
authors.lastname: Juodawlkis