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

Abstract

SUMMARYAn 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 1.7 μm and a capacitance of less than 1 fF, a high responsivity of 1 A/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 1 fJ/bit, which is a step along the road to achieving a dense photonic network and processor on a chip. key words: photonic crystal waveguide, photodetector, buried heterostructure, optical interconnection

Photonic Crystal Circular Defect (CirD) Laser

“…Photonic crystal (PhC), due to its unique physical properties resulting from the photonic bandgap [14], has been intensively researched [15][16][17]. PhC-based optoelectrical devices have shown excellent performance in terms of energy efficiency and operation speed [18][19][20][21]. Therefore, the heterogeneous integration of PhC lasers on Si is an attractive means to achieve a light source for inter-chip or intra-chip optical interconnects.…”