Title :
Improvement of Photonic ADC Based on Phase-Shifted Optical Quantization by Using Additional Modulators
Author :
Wang, Yang ; Zhang, Hongming ; Wu, Qingwei ; Yao, Minyu
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
fDate :
4/1/2012 12:00:00 AM
Abstract :
An improvement of a photonic analog-to-digital converter based on phase-shifted optical quantization (PSOQ) is presented and verified. The resolution can be increased by employing an additional Mach-Zehnder modulator (MZM) to combine with the PSOQ scheme. The improved scheme with a quantization level of 32 (corresponding quantization bit number is 5 bits) is experimentally demonstrated by using two LiNbO3 modulators, and the experimental result with the effective number of bits 4.23 is obtained.
Keywords :
Mach-Zehnder interferometers; analogue-digital conversion; integrated optics; lithium compounds; optical information processing; optical modulation; optical phase shifters; LiNbO3; Mach-Zehnder modulator; analog-to-digital converter; phase-shifted optical quantization; photonic ADC; quantization bit number; Analog-digital conversion; Optical interferometry; Optical modulation; Optical polarization; Phase modulation; Photonics; Quantization; Mach–Zehnder modulator; phase modulator; photonic analog-to-digital converter (ADC); photonic sampling;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2183634
