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毫米波光纤(ROF)传输系统中当采用强度调制器直接调制毫米波信号时,随着传播距离的延长会产生信号强度的周期性衰落问题,限制了毫米波通信技术的发展。光学倍乘法(OFM)将低频或中频调制信号搭载在扫频光信号上,通过在基站生成毫米波的方法,有效缓解信号强度的周期性衰落,具有广阔的发展前景。提出并实验研究了一种基于光学倍乘法产生光毫米波的全双工毫米波光纤传输系统。系统中利用光纤Bragg光栅提取光波作为上行链路光载波,基站中不需配置光源,而且对光功率的损耗小,合理利用了资源。基站中还采用低频本振与毫米波载波混频的方法实现上行链路本振,解决了上行链路本振的生成难题,方法简单,成本低廉,有利于简化基站,降低成本。
When a millimeter wave signal is directly modulated by an intensity modulator in a millimeter wave optical fiber (ROF) transmission system, periodic fading of the signal intensity occurs as the propagation distance increases, which limits the development of the millimeter wave communication technology. Optical multiplication multiplication (OFM) The low-frequency or IF modulation signal is mounted on the swept-frequency optical signal, by generating millimeter wave at the base station method, effectively mitigate the periodic decline of signal strength, has broad prospects for development. A full-duplex millimeter-wave optical fiber transmission system based on optical multiplication is proposed and experimentally studied. In the system, the optical fiber Bragg grating is used to extract the optical wave as the uplink optical carrier, and the base station does not need to be configured with the light source, and the loss to the optical power is small, and the resource is used reasonably. The base station also adopts the method of mixing the low frequency local oscillator and the millimeter wave carrier to realize the uplink local oscillation, and solves the generation problem of the uplink local oscillation. The method is simple and low in cost, and is beneficial to simplifying the base station and reducing the cost.