Ultralow-phase-noise and broadband frequency-hopping coupled optoelectronic oscillator under quiet point operation  

作　　者：HUI LIU MINGYANG GUO TIAN ZHANG JIAN DAI KUN XU 

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China [2]School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Photonics Research》2024年第8期1785-1793,共9页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(61971065,62171055);Beijing Municipal Natural Science Foundation(Z210004)。

摘　　要：Advancements in microwave photonics have yielded novel approaches for generating high-purity microwave sources.Among these,optoelectronic oscillators(OEOs)and coupled optoelectronic oscillators(COEOs)have demonstrated the capability to generate frequency-independent microwaves with exceptionally low phase noise.Nonetheless,the tunability of the oscillators is rather limited due to the necessity for narrowband electronic bandpass filters,presenting challenges in achieving both wide and rapid tuning capabilities.Here,we present a COEO featuring ultralow phase noise,flexible tuning capability,and high robustness.This is achieved through a quiet point(QP)-operated harmonic mode-locked fiber laser,which effectively mitigates optical amplifier noise and supermode competition,thus significantly diminishing the necessity for ultra-narrow electronic filters.Due to the liberated tuning ability,we present an oscillator that can be tuned from 2 GHz to 18 GHz,with phase noise as low as-140 d Bc/Hz at 10 k Hz under the QP operation.We then illustrate the practical application of the proposed oscillator in generating frequency-hopping signals with consistent spurious modes less than-85 d Bc,absolute phase noise below-135 d Bc/Hz at 10 k Hz,hopping resolution of 1.25 MHz,and fractional frequency stability below 6.1×10^(-12)at 1 s averaging time when locked to a reference.The presented COEO structure emerges as a compelling solution for agile and low-noise microwave sources in advanced wireless communication and radar systems.

关 键 词：OPTOELECTRONIC tuning AMPLIFIER 

分 类 号：TN752[电子电信—电路与系统]