Hasan Mehedi, Nicholls Charles, Pitre Keegan, Spokoinyi Boris, Hall Trevor
Photonic Technology Laboratory, University of Ottawa, Advanced Research Complex, 25 Templeton Street, Ottawa, ON, K1N 6N5, Canada.
NANOWAVE Technologies Inc., 6 Gurdwara Rd, Nepean, ON, K2E 8A3, Canada.
Commun Eng. 2024 Nov 4;3(1):156. doi: 10.1038/s44172-024-00301-5.
Phase noise reduces target sensitivity in radar and increases bit error rate in telecommunications systems. Optoelectronic oscillators are known for using optical fibre technology to realise the large delay required to attain superior phase noise performance compared to conventional microwave source technology. However, the long fibre is vulnerable to environmentally induced phase perturbations, while conventional phase shifters have insufficient range to compensate for the phase drift over the operational temperature range without the use of a temperature-controlled enclosure. Here we introduce a vector modulator controlled by a Stuart-Landau integrator, as a solution to non-efficient tuning for the phase shift. The concept is verified by simulation and experimentally demonstrated using an optoelectronic oscillator phase-locked to a system reference. Phase lock is maintained over four free spectral ranges equivalent to a tuning phase range of 1440° when the optoelectronic oscillator is cycled over a 10 °C to 85 °C temperature range. These demonstrations highlight the practical potential of our continuous tuning method.
相位噪声会降低雷达中的目标灵敏度，并增加电信系统中的误码率。光电子振荡器以使用光纤技术来实现与传统微波源技术相比获得卓越相位噪声性能所需的大延迟而闻名。然而，长光纤易受环境引起的相位扰动影响，而传统移相器在不使用温度控制外壳的情况下，其范围不足以补偿工作温度范围内的相位漂移。在此，我们引入一种由斯图尔特 - 兰道积分器控制的矢量调制器，作为解决相移非有效调谐的方案。该概念通过仿真得到验证，并通过将光电子振荡器锁相到系统参考进行了实验演示。当光电子振荡器在10°C至85°C的温度范围内循环时，在相当于1440°调谐相位范围的四个自由光谱范围内保持锁相。这些演示突出了我们连续调谐方法的实际潜力。
