Implementation of a 10.24 GS/s 12-bit Optoelectronics Analog-to-Digital Converter Based on a Polyphase Demultiplexing Architecture

Abstract

In this paper we present the practical implementation of a high-speed polyphase sampling and demultiplexing architecture for optoelectronics analog-to-digital converters (OADCs). The architecture consists of a one-stage divideby-eight decimator circuit where optically-triggered samplers are cascaded to sample an analog input signal, and demultiplex different phases of the sampled signal to yield low data rate for electronic quantization. Electrical-in to electrical-out data format is maintained through the sampling, demultiplexing and quantization processes of the architecture thereby avoiding the need for electrical-to-optical and optical-to-electrical signal conversions. We experimentally demonstrate a 10.24 giga samples per second (GS/s), 12-bit resolution OADC system comprising the optically-triggered sampling circuits integrated with commercial electronic quantizers. Measurements performed on the OADC yielded an effective bit resolution (ENOB) of 10.3 bits, spurious free dynamic range (SFDR) of -32 dB and signal-to-noise and distortion ratio (SNDR) of 63.7 dB.

Frequency equivalent circuits for the on and off state of an optically triggered switch based on a PIN photodiode

“…From ( 4) the cutoff frequency is obtained as the value where the amplitude of the output has an attenuation ratio of 1/ √ 2 and is given by (5):…”

“…High-speed PIN photodiodes (PIN-PD) are essential components for analogue photonic applications such as software defined radios [1,2], antenna arrays [3], photonic analogue-to-digital converters [4][5][6], photonic oscillators [7], and photonic down-converters [8]. Optically triggered switching circuit is the principal configuration for the PIN-PD since they have the potential to improve many aspects of the system performance.…”