High-speed polysilicon CMOS photodetector for telecom and datacom

High-speed polysilicon CMOS photodetector for telecom and datacom

Analysis of the high-speed polysilicon photodetector in fully standard CMOS technology

A high-performance lateral polysilicon photodiode was designed in standard 0.18 μm CMOS technology. The device has a frequency bandwidth far in the GHz range: the measured bandwidth of the poly photodiode was 6 GHz, which figure was limited by the measurement equipment. The high intrinsic (physical) bandwidth is due to a short excess carrier lifetime. The external (electrical) bandwidth is also...

Sub-bandgap polysilicon photodetector in zero-change CMOS process for telecommunication wavelength.

We report a defect state based guided-wave photoconductive detector at 1360-1630 nm telecommunication wavelength directly in standard microelectronics CMOS processes, with zero in-foundry process modification. The defect states in the polysilicon used to define a transistor gate assists light absorption. The body crystalline silicon helps form an inverse ridge waveguide to confine optical mode....

High-Speed Datacom VCSELs at 1310 and 980 nm

Recent progress on VCSELs for datacom applications within the author’s group at UCSB will be reviewed. Efforts on ‘all-epitaxial, long-wavelength’ InP-based devices as well as efficient, small-cavity-volume GaAsbased VCSELs will be included. InGaAlAs/InGaAsSb/InP all-epitaxial wafers processed in a conventional manner are found to provide viable VCSELs across the entire 1300-1600 nm wavelength ...

Reflectively Coupled Waveguide Photodetector for High Speed Optical Interconnection

To fully utilize GaAs high drift mobility, techniques to monolithically integrate In0.53Ga0.47As p-i-n photodetectors with GaAs based optical waveguides using total internal reflection coupling are reviewed. Metal coplanar waveguides, deposited on top of the polyimide layer for the photodetector's planarization and passivation, were then uniquely connected as a bridge between the photonics and ...