Polarization-maintaining time-interleaved optical analog-to-digital converter

Abstract

A polarization-maintaining time-interleaved optical analog-to-digital converter sequentially comprises a mode-locked laser, an optical time division multiplexing frequency multiplication module, a spectrum slicing frequency multiplication module, an optical amplification module, an electro-optic intensity modulation module, a polarization-maintaining connection module, an optical demultiplexing module, a photoelectric converting and processing module and a synchronization module which are connected through polarization-maintaining optical fibers. According to the polarization-maintaining time-interleaved optical analog-to-digital converter, it is guaranteed that the polarization state of an optical sampling pulse sequence in the process of optical time division multiplexing frequency multiplication, spectrum slicing frequency multiplication, optical amplification and transmission does not change on the basis of the polarization-maintaining structure, polarized light emitted by the mode-locked laser always coincides with the polarization axis direction of an electrooptical modulator, and therefore optical pulse amplitude fluctuation caused by polarization dependence is eliminated. A high-stable frequency source of the synchronization module provides same frequency references for the mode-locked laser and an electric analog-to-digital converter, therefore, it is guaranteed that the electric analog-to-digital converter has few shakes on the time interval that a photoelectric detector outputs sampling points of an electronic pulse sequence, and the precision is improved.

Description

technical field [0001] The invention relates to optical information processing technology, in particular to a polarization-maintaining time-interleaving optical analog-to-digital converter. Background technique [0002] Converting analog signals into digital signals for processing, transmission, storage and display is one of the main directions of information technology development. The performance of EADC (Electronic Analog to Digital Converter) is limited by "electronic bottlenecks" such as electrical sampling clock jitter and comparator ambiguity, and it is difficult to further improve it. Optical analog-to-digital converter (Photonic Analog to Digital Converter, hereinafter referred to as PADC) utilizes high-stable, high-precision optical sampling pulses, high-speed, broadband photonics devices to realize high-speed, broadband signal digitization, and can break through electronic bottlenecks. An effective way to achieve high-performance analog-to-digital conversion. ...

AI Technical Summary

Problems solved by technology

Since the repetition frequency of the laser output pulse sequence does not necessarily correspond to the crystal oscillator frequency in the phase-locked circuit, the design of the phase-locked circuit is complex and cumbersome, and the clock accuracy is limited, thus restricting the accuracy of TIPADC

Images