Pagán Vincent R, Haas Bryan M, Murphy T E
Laboratory for Physical Sciences, College Park, MD 20740, USA.
Opt Express. 2011 Jan 17;19(2):883-95. doi: 10.1364/OE.19.000883.
We propose and demonstrate an electrooptic technique for relaying microwave signals over an optical fiber and downconverting the microwave signal to an intermediate frequency at the receiver. The system uses electrooptic phase modulation in the transmitter to impose the microwave signal on an optical carrier followed by re-modulation with a microwave local oscillator at the receiver. We demonstrate that by subsequently suppressing the optical carrier using a notch filter, the resulting optical signal can be directly detected to obtain a downconverted microwave signal.We further show that by simply controlling the amplitude of the microwave local oscillator, the system can be linearized to third-order, yielding an improvement in the dynamic range.
我们提出并演示了一种电光技术，用于通过光纤中继微波信号，并在接收器处将微波信号下变频到中频。该系统在发射机中使用电光相位调制，将微波信号施加到光载波上，然后在接收器处用微波本地振荡器进行再调制。我们证明，通过随后使用陷波滤波器抑制光载波，可以直接检测得到的光信号以获得下变频的微波信号。我们还表明，通过简单地控制微波本地振荡器的幅度，该系统可以线性化到三阶，从而提高动态范围。
