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实验研究了一种基于单臂马赫-曾德尔强度调制器,并在基站利用光载波抑制技术产生40 GHz光载毫米波的全双工正交频分复用光纤无线通信(OFDM-ROF)系统。在下行链路中,2.5 Gb/s的OFDM信号与20 GHz的射频正弦波信号混频后,驱动强度调制器调制中心激光载波,经标准单模光纤(SSMF)传输至基站后接收;在上行链路中,通过波长重利用调制2.5 Gb/s的开关键控信号传输至中心站。实验结果表明,下行和上行分别经过50 km SSMF传输后功率代价分别小于1和0.5 dB。
A full-duplex Orthogonal Frequency Division Multiplexing (OFDM-ROF) system based on a single arm Mach-Zehnder intensity modulator and 40 GHz optical millimeter-wave millimeter wave generation using optical carrier suppression technology at the base station was experimentally studied . In the downlink, the 2.5 Gb / s OFDM signal is mixed with the 20 GHz RF sine wave signal to drive the intensity modulator to modulate the center laser carrier and transmit it to the base station after receiving the standard single-mode optical fiber (SSMF). After the uplink Link, through the use of wavelength modulation modulation 2.5 Gb / s on-off keying signal transmission to the central station. The experimental results show that the power cost of the downlink and the uplink after transmitting respectively by 50 km SSMF is less than 1 and 0.5 dB, respectively.