Opt Lett. 2018 Jun 1;43(11):2466-2469. doi: 10.1364/OL.43.002466.
We propose a microwave photonic link to transmit a dual-chirp microwave waveform over fiber with compensation of dispersion-induced power fading. In a center office (CO), we use a polarization-dependent dual-parallel Mach-Zehnder modulator (DPMZM) which is driven by a radio frequency (RF) carrier and a baseband single-chirped waveform to realize carrier-suppressed dual-sideband (CS-DSB) modulation at two orthogonal polarization states. When the CS-DSB optical signal is detected by a photodetector (PD) at a base station (BS), the dual-chirp waveform is generated. However, along with the transmission to different BSs before emission, the chromatic dispersion of fiber will cause power fading. In our link, we can simply adjust the polarization controller (PC) in each BS to compensate for the dispersion-induced power fading for different transmission distances and RF carrier frequencies. Besides, the link can realize one to multitransmission with shared dual-chirp microwave source in CO for radars. The proposed scheme is theoretically analyzed and experimentally verified.
我们提出了一种微波光子链路，用于在光纤中传输双啁啾微波波形，并补偿色散引起的功率衰落。在中心局（CO）中，我们使用偏振相关的双平行马赫-曾德尔调制器（DPMZM），由射频（RF）载波和基带单啁啾波形驱动，在两个正交偏振态下实现载波抑制双边带（CS-DSB）调制。当 CS-DSB 光信号在基站（BS）处由光电探测器（PD）检测到时，会产生双啁啾波形。然而，随着在发射前传输到不同的 BS，光纤的色度色散会导致功率衰落。在我们的链路中，我们可以简单地调整每个 BS 中的偏振控制器（PC），以补偿不同传输距离和 RF 载波频率引起的色散诱导的功率衰落。此外，该链路可以通过 CO 中的共享双啁啾微波源实现雷达的一对多传输。所提出的方案在理论上进行了分析，并通过实验得到了验证。
