A novel scheme to implement an optical single-sideband (OSSB) polarization modulator (PolM) is proposed and theoretically demonstrated in this paper. The proposed OSSB-PolM is based on the phase modulation technique in two consecutive Sagnac interferometers (SIs). It is shown that by applying four equal-power radio frequency (RF) signals with appropriate phases to electro-optic modulators and aligning the polarization state of the modulated signal in the proper direction, an OSSB-PolM signal will be generated. The proposed scheme can find many microwave photonic (MWP) applications. To show this, an OSSB modulator with tunable optical carrier-to-sideband ratio, an OSSB-suppressed carrier modulator/optical frequency shifter, and a full-ranged MWP phase shifter are proposed and demonstrated. The proposed structure includes several important advantages. For instance, the system is free from the limitations caused by optical/electrical filters. Since the propagating lights in an SI traverse the identical optical path in clockwise and counterclockwise directions, the system is immune to environmental perturbations. Furthermore, there is no need for a bias control circuit, so the system has a stable operation. In addition, the proposed scheme can be extended to multichannel applications in array antennas. Theoretically, calculations have been verified by simulation results.

中文翻译：

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基于萨格纳克干涉仪的光学单边带偏振调制器及其在光纤无线系统中的应用

本文提出了一种新的方案来实现光学单边带（OSSB）偏振调制器（PolM）。提出的OSSB-PolM基于两个连续Sagnac干涉仪（SI）中的相位调制技术。示出了通过将具有适当相位的四个相等功率的射频（RF）信号施加到电光调制器并且在适当方向上对准调制信号的偏振态，将生成OSSB-PolM信号。所提出的方案可以找到许多微波光子（MWP）应用。为了显示这一点，提出并演示了具有可调的光载波边带比的OSSB调制器，抑制了OSSB的载波调制器/光频移器以及全范围MWP相移器。所提出的结构包括几个重要的优点。例如，该系统不受光电滤波器引起的限制。由于SI中的传播光沿顺时针和逆时针方向遍历相同的光路，因此该系统不受环境干扰。此外，不需要偏置控制电路，因此系统具有稳定的操作。另外，所提出的方案可以扩展到阵列天线中的多信道应用。从理论上讲，计算已通过仿真结果进行了验证。此外，不需要偏置控制电路，因此系统具有稳定的操作。另外，所提出的方案可以扩展到阵列天线中的多信道应用。从理论上讲，计算已通过仿真结果进行了验证。此外，不需要偏置控制电路，因此系统具有稳定的操作。另外，所提出的方案可以扩展到阵列天线中的多信道应用。从理论上讲，计算已通过仿真结果进行了验证。