| 基于偏振调制的最优接收灵敏度的ROF链路研究 |
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| 引用本文： | 李晶,宁提纲,裴丽,简伟,郑晶晶,油海东,温晓东.基于偏振调制的最优接收灵敏度的ROF链路研究[J].红外与激光工程,2016,45(6):617004-0617004(6). |
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| 作者姓名： | 李晶 宁提纲 裴丽 简伟 郑晶晶 油海东 温晓东 |
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| 作者单位： | 1.北京交通大学 全光网络与现代通信网教育部重点实验室,北京 100044; |
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| 基金项目： | 国家自然科学基金(61405007);北京市自然科学基金(4154081);北京交通大学人才基金(2014RC027) |
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| 摘 要： | 提出了一个基于偏振调制的最佳接收灵敏度ROF链路系统。其根本原理在于实现具有最佳光载波边带比(OCSR)的光单边带调制技术,为此,利用偏振调制和滤波技术,线偏光首先经由一个特定偏振角进入偏振调制器,然后一个固定起偏角的起偏器被用来合并偏振信息,最后利用一个光滤波器实现光双边带调制到光单边带调制的转换。研究发现所获得的OCSR只与两个偏振角(和)有关,通过仔细调节上述指标,可以将OCSR调谐至最佳值0 dB。利用仿真验证了上述结论,仿真发现通过将OCSR调谐至最佳值将大大提高ROF链路的接收灵敏度。
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| 关 键 词： | 微波光子 微波光子链路 接收灵敏度 光单边带调制 光载波边带比 |
| 收稿时间： | 2015-10-12 |
Study on a radio over fibre link with improved receiver sensitivity based on polarization modulation |
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| Affiliation: | 1.Key Lab of All Optical Network &Advanced Telecommunication Network of EMC,Beijing Jiaotong University,Beijing 100044,China;2.Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China;3.Science and Information College,Qingdao Agricultural University,Qingdao 266109,China |
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| Abstract: | In this work, a radio over fibre link with improved receiver sensitivity was reported. The basical mechanism of this prototype was to realize optical single sideband modulation with an optimum optical carrier-to-sideband ratio(OCSR). To do this, both polarization modulation and optical interleaving technology were employed. The linearly polarized incident light was firstly oriented at an angle of (0 or 90) relative to one principal axis of the polarization modulator (PolM), which is biased by V and driven by RF signals. Then a polarizer with its polarization direction (0 or 90) relative to one principal axis of the PolM was used to linearize the polarization state. Finally, optical double sideband signal was converted to optical single sideband signal by using a standard optical interleaver. It is found the OCSR is only dependent on the values of two polarization angle, and . With careful adjustment, the OCSR can be reduced to 0 dB, which is the optimum value for a single RF tone modulation. The receiver sensitivity of the fibre link is analyzed by theory and then verified by simulation. It can be greatly improved by using this technique. |
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