共查询到16条相似文献,搜索用时 62 毫秒
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抑光载波双边带Radio over Fiber双工通信系统设计 总被引:1,自引:1,他引:0
提出并模拟证明了基于两个电光相位调制器实现抑光载波双边带(Radioon Fiber,RoF)双工传输系统设计方案.通过改变电光相位调制器的最大相偏量,实现了抑光载波双边带信号传输——使通信带宽加倍,而且很好地控制上下行传输信号的误码率.仿真模拟结果表明,发射功率为3dBm的光信号在无放大、色散系数为20psj(nm·km)、衰减系数为0.25dB/km的SMF-28单模光纤中传输时,其超高频RF调制信号的频率可达24GHz,数据码元传输速率可达2.5Gbit/S,传输距离40km以上. 相似文献
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研究了基于双边带载波抑制调制的高频载波信号馈送系统的传输性能.分析了双边带载波抑制调制的原理,系统输出倍频信号的功率以及载波信号经过馈送系统后相位噪音发生劣化的原因.通过实验测量输入载波信号和输出倍频信号的功率和相位噪音验证了理论分析的正确性.结果表明,系统输出倍频信号的功率为-5.7dBm,载波信号经过馈送系统后近端相位噪音劣化了6dB,远端相位噪音劣化了21dB. 相似文献
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研究了基于双边带载波抑制调制的高频载波信号馈送系统的传输性能.分析了双边带载波抑制调制的原理,系统输出倍频信号的功率以及载波信号经过馈送系统后相位噪音发生劣化的原因.通过实验测量输入载波信号和输出倍频信号的功率和相位噪音验证了理论分析的正确性.结果表明,系统输出倍频信号的功率为-5.7 dBm,载波信号经过馈送系统后近端相位噪音劣化了6 dB,远端相位噪音劣化了21 dB. 相似文献
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提出了一种有效抑制零级中心频带方案,并证实了该方案的可行性,给出了基于该方案的单工Radio over Fiber (RoF)通信系统.通过光通信系统软件Optisystem5.0仿真模拟结果显示:光源发送功率为5 dBm,途中无光放大,24 GHz的超高频微波信号在色散系数为20 ps/nm/km、衰减系数为0.25 dB/km的单模光纤中传输,系统码元传输速率可达5 Gbit/s、传输距离15 km以上. 相似文献
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一种改进的双边带调制产生光毫米波的方案 总被引:9,自引:0,他引:9
提出了应用于光纤无线通信系统中一种改进的双边带调制产生光毫米波方案。在中心站采用强度调制将射频信号调制到光载波上产生一个双边带信号,滤掉中心载波后,利用光交叉复用器把双边带信号的上下边带模分开,将数据速率为2.5Gbit/s的基带信号调制到下边带模后,再与未调信号耦合后产生光毫米波,然后通过单模光纤传输至基站,在基站经过光电转换后产生电毫米波信号。从理论上对该毫米波的色散特性进行了分析,发现毫米波的接收功率不会周期的衰减。同时通过实验研究表明,下行链路信号通过光纤能传输50km而不需要色散补偿,功率代价小于1dBm。因此,该方法产生的光毫米波能有效克服光纤色散引起的信号时延而导致的基带信号退化,适合于远距离传输。 相似文献
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理论分析并实验研究了一种基于双平行马赫曾德调制器(DP-MZM)具有动态光载波边带比(OCSR)调谐能力的光单边带(OSSB) 调制实现方案, 方案利用DP-MZM内部集成的三个独立的调制单元, 分别实现OSSB调制、光载波移相和光信号干涉, 最终, 仅需改变调制器的一个偏置点, 就实现了OCSR的动态调谐, 实验得到了小信号调制(调制系数m=0.2)下, OCSR的可调范围-20.8–23.5 dB. 并分析了OCSR与射频功率之间的对应关系, 通过本方案调谐至最佳的OCSR可提高模拟光链路接收灵敏度.
关键词:
光纤通信
微波光子
光载波边带比
光单边带调制 相似文献
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提出并研究了一种使用单光源的光纤无线双向传输系统.该系统只需在中心站配置一个可调谐激光器,以产生频率恒定的激光光源,通过综合光学调制(频率调制、强度调制)技术将基带信号调制到光载波上,最终形成60 GHz毫米波下行信号|同时,相同的光载波在基站被重用,作为上行链路传输光源.系统结合光载波重用技术和综合调制技术特点,合理利用资源,基站结构更为简化.仿真结果表明,该系统可以将速率达2.5 Gbit/s的数据在单模光纤中双向传输20 km,功率代价小于0.5 dB,相对已有的技术方案,该传输系统在传输功率、传输距离、传输性能方面具有明显优势. 相似文献
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Abstract The article proposes a novel scheme for full-duplex radio-over-fiber transmissions with frequency-octupling millimeter-wave and wavelength reuse. In this scheme, the base station is simplified greatly as there is no laser, and the uplink millimeter-wave signal is down-converted to a low frequency using a 60-GHz local oscillator, which is optically obtained from the downlink signal. The scheme can utilize optical power efficiently, and thus, a cost-effective radio-over-fiber system is achieved. Transmission performance for both down- and uplink data are theoretically analyzed and investigated by simulation; results show that the performance of the system is not sensitive to fiber dispersion. 相似文献
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Abstract A novel mm-wave generation scheme based on two phase modulators and two unbalanced Mach-Zehnder interferometers is proposed. Compared with the conventional Mach-Zehnder modulator-based scheme, the phase-modulator-based scheme can work steadily without an electrical control circuit for the DC bias, and it has smaller insertion loss. A full-duplex radio-over-fiber system was investigated by simulation, and its performance is not affected by chromatic dispersion for both downstream and upstream transmission. A 40-GHz mm-wave is generated from a 5-GHz driving signal. The system performance is analyzed by using eye diagrams and bit error rate. Results demonstrate that the performance is still very good, even after a 50-km transmission. 相似文献
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A novel system for multiplexed optical fiber interferometric sensors is proposed applying the synthesis of optical coherence function with phase generated carriers. The ideal parameters of the laser diode frequency modulation for the phase generated carrier with the synthesis of the optical coherence function are discussed. A basic experimental setup including two interferometric sensors is constructed. The results show that the phase signal from the two sensors can successfully be demultiplexed by scanning the synthesized coherence peak. 相似文献
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Theoretical analysis and experimental investigation of microwave photonic links with bias-shifted Mach-Zehnder modulators are presented. An optical amplifier is used to increase link gain and reduce noise figure. The combination of modulator bias shift away from quadrature and optical amplification reduces the link noise figure by more than 15 dB. For modulation frequencies from 2 to 18 GHz, the third-order limited spurious-free dynamic range (SFDR3) of these links is greater than 120 dB, normalized to a 1-Hz bandwidth. Conventional links based on Mach-Zehnder modulators are limited to SFDR3 values of approximately 110 dB, normalized to a 1-Hz bandwidth. This level of performance is achieved without electronic or optical linearization. 相似文献