Analog light signal based opto-electronic ring-oscillator and tunable oscillation frequency

This paper demonstrates opto-electronic ring-oscillator constructed by an odd number of opto-electronic inverters for the digital (electric) and analog (light) signals based on mixed-signal communications. The optoelectronic inverter is consisting of light-emitting and light-receiving parts which can be regarded as a digitalto-analog and an analog-to-digital converters, respectively. To investigate the light-signal processing properties, the oscillation frequency (fosc) studies were performed by controlling three different parameters of load resistors (RL), light wavelengths (lambda), and photosensor type. The smaller RL or the shorter lambda of the light signal brings the faster fosc in opto-electronic ring-oscillator. In addition, the photodiode-based opto-electronic ringoscillator shows much faster signal processing characteristics than the case of CdS sensor. Our opto-electronic ring-oscillators show a wide range of tunable fosc from 0.92 Hz to 114.42 Hz; moreover, it shows small signallike light transfer characteristics as an analog signal process that can be useful in future opto-electronic device applications.

Automated summary

This study demonstrates an opto-electronic ring oscillator composed of an odd number of opto-electronic inverters for processing digital and analog signals. By controlling load resistors, light wavelengths, and photosensor types, the oscillation frequency can be adjusted. Opto-electronic ring oscillators based on photodiodes show faster signal processing characteristics compared to those using CdS sensors.