We propose and experimentally demonstrate a novel and simple approach to implementing optical single-sideband (OSSB) modulation with tunable optical carrier-to-sideband ratio (OCSR) based on a dual-polarization Mach–Zehnder modulator (DPol-MZM) and a polarizer (Pol). In this scheme, the light wave is modulated by radio frequency (RF) signal with SSB modulation in the upper arm of the DPol MZM, while the light wave in the lower arm is not modulated. Therefore, a partial polarization orthogonal SSB (PPO SSB) modulated signal is generated at the output of the DPol MZM without using an optical band-pass filter (OBPF). The PPO SSB signal is then sent to a Pol through a polarization controller. By simply adjusting the polarization state, the OSSB modulation with tunable OCSR can be realized. The experimental results show that an OSSB-modulated signal with adjustable OCSR from – 35 to 55 dB can be achieved. Besides, the proposed scheme features the merit of wideband tunability, where the radio frequency (RF) can be operated from 3 to 17 GHz.

中文翻译：

---

基于双极化马赫曾德尔调制器和偏振器的可调谐光载波对边带比的光单边带调制

我们提出并通过实验证明了一种新颖且简单的方法，以基于双偏振马赫曾德尔调制器（DPol-MZM）和偏振器的可调谐光学载波对边带比率（OCSR）来实现光学单边带（OSSB）调制（波尔）在该方案中，光波在DPol MZM的上臂中被具有SSB调制的射频（RF）信号调制，而下臂中的光波未被调制。因此，在不使用光学带通滤波器（OBPF）的情况下，在DPol MZM的输出处生成了部分偏振正交SSB（PPO SSB）调制信号。然后，通过极化控制器将PPO SSB信号发送到Pol。通过简单地调整极化状态，可以实现具有可调OCSR的OSSB调制。实验结果表明，可以实现OSSB调制的信号，其OCSR在– 35至55 dB之间可调。此外，所提出的方案具有宽带可调谐性的优点，其中射频（RF）可以在3至17 GHz的频率下工作。