Sub-fF-Capacitance Photonic-Crystal Photodetector Towards fJ/bit On-Chip Receiver

Kengo NOZAKI
Shinji MATSUO
Koji TAKEDA
Takuro FUJII
Masaaki ONO
Abdul SHAKOOR
Eiichi KURAMOCHI
Masaya NOTOMI

Publication
IEICE TRANSACTIONS on Electronics   Vol.E100-C    No.10    pp.750-758
Publication Date: 2017/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.750
Type of Manuscript: Special Section INVITED PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
Category: 
Keyword: 
photonic crystal waveguide,  photodetector,  buried heterostructure,  optical interconnection,  

Full Text: FreePDF(4.8MB)

Summary: 
An ultra-compact InGaAs photodetector (PD) is demonstrated based on a photonic crystal (PhC) waveguide to meet the demand for a photoreceiver for future dense photonic integration. Although the PhC-PD has a length of only 1.7µm and a capacitance of less than 1fF, a high responsivity of 1A/W was observed both theoretically and experimentally. This low capacitance PD allows us to expect a resistor-loaded receiver to be realized that requires no electrical amplifiers. We fabricated a resistor-loaded PhC-PD for light-to-voltage conversion, and demonstrated a kV/W efficiency with a GHz bandwidth without using amplifiers. This will lead to a photoreceiver with an ultralow energy consumption of less than 1fJ/bit, which is a step along the road to achieving a dense photonic network and processor on a chip.