| 光纤CATV外调制发射机中的复合二次失真及其抑制 |
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| 引用本文： | 杨建良,涂涛,查开德.光纤CATV外调制发射机中的复合二次失真及其抑制[J].光子学报,2000,29(11):1001-1004. |
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| 作者姓名： | 杨建良 涂涛 查开德 |
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| 作者单位： | 1. 清华大学电子工程系,北京,100084;湘潭大学电子工程系,湘潭,411105
2. 清华大学电子工程系,北京,100084 |
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| 基金项目： | 中国博士后科学基金，广东省深圳市华为技术有限公司资助项目，中博基(1999)17号，，， |
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| 摘 要： | 复合二次失真(CSO:Composite Second Order Distortion)是光纤CATV中最主要的非线性之一.理论分析表明:在外调制CATV中,将调制器偏置在最佳偏置点可以消除CSO,但外调制器最佳偏置点却随时间及环境温度等漂移,因而会导致CSO的严重恶化.本文提出了一种易于实现的调制器偏置点控制方案,并进行了详细的理论分析与实验研究,结果显示该方案能够将50～550MHz宽频带内电视信号CSO指标抑制在-65dB以下.
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| 关 键 词： | 光纤CATV外调制发射机 复合二次失真 偏置点控制 |
| 收稿时间： | 2000-03-28 |
COMPOSITE SECOND ORDER DISTORTION AND IT'S SUPPRESSION IN OPTICAL FIBER CATV EXTERNALLY MODULATED TRANSMITTER |
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| Yang Jianliang,Tu Tao,Zha Kaide.COMPOSITE SECOND ORDER DISTORTION AND IT'S SUPPRESSION IN OPTICAL FIBER CATV EXTERNALLY MODULATED TRANSMITTER[J].Acta Photonica Sinica,2000,29(11):1001-1004. |
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| Authors: | Yang Jianliang Tu Tao Zha Kaide |
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| Institution: | 1. Dept. Electronic Engineering, Tsinghua University, Beijing 100084;2. Dept. Electronic Engineering, Xiangtan University, Xiangtan 411105 |
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| Abstract: | Composite second order distortion (CSO) is one of the main nonlinear distortion in optical fiber CATV transmission system.In the optical fiber AM CATV externally modulated transmitter,the CSO can be eliminated completely in principle if the modulator is biased in optimal bias point.But the optimal bias point drifts all the time because of the change of temperature and time,therefore the CSO will be badly degenerated.In this paper a novel control loop for biasing the modulator is presented and it is researched in detail,Experimental results agree well with the theoretical analysis and have shown that the CSO is less than -65dB in the wide passband from 50MHz to 550MHz. |
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| Keywords: | Optical fiber CATV externally modulated transmitter Composite second order distortion Bias point control |
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