High-responsivity 1.7-µm-long InGaAs photodetectors based on photonic crystal with ultrasmall buried heterostructure

InGaAs-embedded photonic crystal photodetectors were demonstrated towards realizing photoreceivers with small junction capacitance. A 1-A/W responsivity and a 40-Gb/s eye opening were successfully confirmed for the 1.7-μm-long device.