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Photonic generation of widely tunable and background-free binary phase-coded radio-frequency pulses

机译：广泛可调且无背景的二进制相位编码射频脉冲的光子产生

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摘要

We present a novel photonic approach to generating widely tunable and background-free binary phase-coded radiofrequency (RF) pulses by cascading a polarization modulator (PolM) and a phase modulator (PM). The PolM is used to produce an optical carrier and two sidebands with orthogonal polarization states. The phase shift θ between the optical carrier and the sidebands is controlled by the electrical driving signal applied to the PM. For θ > π/2 or <π/2, the phase of the detected RF signal is 0 or π, respectively. For θ = π/2, there is no RF signal recovered in the photodiode (PD). In this way, binary phase-coded RF pulses can be generated, while the optical power launched to the PD keeps constant. The proposed technique is therefore background free by eliminating the baseband frequency components. Moreover, the carrier frequency of the RF pulses is widely tunable and the π phase shift of the RF signal is independent of the amplitude of the electrical driving signal. The proposed scheme is theoretically analyzed and experimentally verified.
机译：我们提出了一种新的光子方法，通过级联偏振调制器（PolM）和相位调制器（PM）来生成可广泛调谐且无背景的二进制相位编码射频（RF）脉冲。 PolM用于产生光载波和具有正交偏振态的两个边带。光学载波和边带之间的相移θ由施加到PM的电驱动信号控制。对于θ>π/ 2或<π/ 2，检测到的RF信号的相位分别为0或π。对于θ=π/ 2，在光电二极管（PD）中没有恢复到RF信号。这样，可以生成二进制相位编码的RF脉冲，同时发射到PD的光功率保持恒定。因此，通过消除基带频率分量，所提出的技术是无背景的。而且，RF脉冲的载波频率是可广泛调节的，并且RF信号的π相移与电驱动信号的幅度无关。理论分析和实验验证了该方案的有效性。

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