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提出并理论证明了一个基于自差60GHz接收机的光载无线通信(RoF)系统,克服了非相干光源的相位噪声问题,避免使用高速电光调制器件和锁相环。此RoF系统既支持高速数据传输,又简化了中心站(CS)和远端天线单元(RAU)。上下行链路采用光载基带和光载中频(IF)信号,提高了光链路的频谱利用率。下行链路用高速光电探测器(PD)光生60GHz毫米波,终端用自差接收机消除相位噪声的影响,并直接得到接收基带信号。上行链路采用低速光电探测器探测直接得到基带信号,降低了中心站的造价,同时减少了光源数量。OptiSystem和Matlab模拟实验证明了下行和上行链路误码率(BER)为10-9时,光灵敏度性能分别提高7.1dB和1.5dB,实现了2.5Gb/s信号在32.4km的单模光纤(SMF)光链路上的无差错传输。
Proposed and theoretically proved an optical wireless communication (RoF) system based on a 60GHz receiver with self-deviation, which overcomes the problem of phase noise of incoherent light sources and avoids the use of high speed electro-optic modulation devices and phase-locked loops. This RoF system supports both high-speed data transmission and simplified center station (CS) and remote antenna unit (RAU). Uplink and downlink use optical carrier baseband and optical carrier frequency (IF) signals, improve the optical link spectrum utilization. Downlink high-speed photodetector (PD) photogenerated 60GHz millimeter-wave, terminal with self-destructive receiver to eliminate the impact of phase noise, and receive the baseband signal directly. The low-speed photodetector detection on the uplink directly obtains the baseband signal, reducing the cost of the central station and reducing the number of light sources. OptiSystem and Matlab simulation experiments show that the sensitivity of the optical sensitivity increases by 7.1dB and 1.5dB respectively when the bit error rate (BER) of downlink and uplink is 10-9, and achieves 2.5Gb / s signal over 32.4km single-mode optical fiber SMF) Optical link error-free transmission.