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直调与外调型微波光子链路线性度的实验研究

Experimental Study on Linearity of Microwave Photonic Link with Direct Modulation or External Modulation

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摘要

理论研究了直接调制与外调制模式下的微波光子链路的线性度,以直调激光器为核心器件的直接调制型短距离微波光子链路具有明显优势。着重开展实验研究,采集和分析两种调制模式下的信号,获得关键性能参数,包括链路损耗、线性动态范围(CDR)和无杂散动态范围(SFDR)。比较了不同长度光纤传输下的动态范围,发现直接调制型微波光子链路经10 km光纤传输后性能显著下降。此外,纳入直调激光器线宽、啁啾因素,实验研究了不同长度光纤下色散的影响。结果显示,直接调制型短距离微波光子链路具有高线性度的优势。

Abstract

The linearity of microwave photonic link with direct modulation mode or external modulation mode is theoretically studied. The direct modulation short-range microwave photonic link, which is used direct modulation laser as the core device, has obvious advantages in linearity. Then the experiments are carried out to obtain key performance parameters through analysis of acquired signals under the two modulation modes, including the link loss, compression dynamic range (CDR) and spurious free dynamic range (SFDR). The dynamic ranges of fiber links with different lengths are compared, and the performance of the microwave photonic link with direct modulation drops significantly after the 10-km optical fiber transmission. In addition, considering the linewidth and chirp of directly modulated laser, dispersion effects for fiber links with different lengths are studied experimentally. The result shows that the microwave photonic link with direct modulation has high linearity for short-distance transmission.

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中图分类号:TN913.7

DOI:10.3788/cjl201845.1106002

所属栏目:光纤光学与光通信

基金项目:国家863计划(2015AA016903)、国家自然科学基金(61378008)、四川省国际科技合作重大项目

收稿日期:2018-03-15

修改稿日期:2018-06-04

网络出版日期:2018-06-22

作者单位    点击查看

陈华:西南交通大学信息科学与技术学院信息光子与通信研究中心, 四川 成都 611756
邹喜华:西南交通大学信息科学与技术学院信息光子与通信研究中心, 四川 成都 611756
于歌:西南交通大学信息科学与技术学院信息光子与通信研究中心, 四川 成都 611756
卢冰:西南交通大学信息科学与技术学院信息光子与通信研究中心, 四川 成都 611756

联系人作者:邹喜华(zouxihua@swjtu.edu.cn)

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引用该论文

Chen Hua,Zou Xihua,Yu Ge,Lu Bing. Experimental Study on Linearity of Microwave Photonic Link with Direct Modulation or External Modulation[J]. Chinese Journal of Lasers, 2018, 45(11): 1106002

陈华,邹喜华,于歌,卢冰. 直调与外调型微波光子链路线性度的实验研究[J]. 中国激光, 2018, 45(11): 1106002

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