A technique to provide independent control on the amplitude and phase of two orthogonal linearly polarised light is presented. It is based on operating a commercial dual-polarisation dual-drive Mach Zehnder modulator (DPol-DDMZM) in reverse direction that routes the input light in slow and fast axis into two different DDMZMs. The technique has the advantage of controlling the phase of the slow-axis light and the amplitude of the fast-axis light has no effect on the light travelling in the orthogonal polarisation state. It has applications in linearised microwave photonic links, frequency multipliers and microwave phase shifters. A new microwave photonic Hilbert transformer based on using the reverse operating DPol-DDMZM to alter the phase of an RF modulation sideband without affecting the orthogonally polarised optical carrier is developed. Experimental results demonstrate 24.3 dB attenuation in the fast-axis light with no change in the slow-axis light, and 0°–360° RF phase shift for only 3.3 V change in DC voltage. The new Hilbert transformer with less than 2.5° phase imbalance and 0.4 dB amplitude ripples over 4–18 GHz frequency range is also demonstrated.

中文翻译：

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两路正交线偏振光的独立幅值和相位控制及其应用


提出了一种对两个正交线偏振光的幅度和相位进行独立控制的技术。它基于反向操作商用双偏振双驱动马赫曾德调制器 (DPol-DDMZM)，将慢轴和快轴的输入光路由到两个不同的 DDMZM。该技术的优点是可以控制慢轴光的相位，而快轴光的振幅对正交偏振态传播的光没有影响。它可应用于线性化微波光子链路、倍频器和微波移相器。开发了一种基于使用反向操作 DPol-DDMZM 来改变 RF 调制边带相位而不影响正交偏振光载波的新型微波光子希尔伯特变换器。实验结果表明，快轴光衰减 24.3 dB，慢轴光没有变化，直流电压仅变化 3.3 V，RF 相移为 0°–360°。还展示了新型希尔伯特变压器，其相位不平衡度小于 2.5°，并且在 4-18 GHz 频率范围内振幅纹波为 0.4 dB。