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Optical Carried Microwave/Millimeter-wave Transmission Technology

Author: HuangZongJie
Tutor: ZhangXianMin
School: Zhejiang University
Course: Physical Electronics
Keywords: RoF link MZM Stability control EDFA Long-distance transmission
CLC: TN015
Type: Master's thesis
Year: 2012
Downloads: 52
Quote: 0
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Abstract


Optical carrier microwave / millimeter wave transmission (Radio over Fiber, RoF) system has a very important development prospects . RoF link has the advantages of light weight, small size, high- bandwidth , strong anti-interference ability and confidentiality , the base station and transmission system greatly simplifies network structure , and adapt to the rapid rate of the development trend of the modern high-capacity communications system ; military radar signal transmission system of the study , the ROF transmission system also gradually be widely applied . Visible transmission system of the RoF has a great significance. This paper is divided into three parts to introduce RoF transmission system technology . The first part of the the RoF link model analysis describes the typical RoF link model experiments and applications , as well as the important link devices , and some of the theoretical analysis . The second part is RoF transmission system design and implementation , including laser RoF link , Mach - Zehnder electro-optic modulator ( Mach -Zehnder modulator MZM ) and photodetector (photodetector, PD) and other important devices in the hardware circuit the design and implementation of the system , allowing the system to remain stable in the temperature range of -55 ℃ to 70 ℃ system gain , the first-order signal gain steady in the best condition , and measure the electrical performance of the analytical system . Finally, in the above RoF transmission system based on improvements to achieve the MZM any bias point stability control , and joined the erbium-doped fiber amplifier (erbium-doped fiber amplifier, EDFA), so that the system is suitable for long-distance transmission . By designing corresponding hardware system control, as much as possible to increase the RF gain of the system , and stable and reliable control , so that the system is maintained within a certain range of temperature change in the optimum RF gain state ; this document in addition to the design for the gain of the system RF analysis , but also propose the design of the system under different performance requirements . The RoF transmission system technology research to achieve a high bandwidth, high gain , stability of the transmission system , the experiments show that in 6GHz to 18GHz range , the system can be -55 ℃ to 70 ℃ effective stabilizing work ; through improved added EDFAs , MZM and effective stabilizing control can be achieved higher RF gain of the transmission system , is applicable to long-distance transmission .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Microwave and UHF
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