Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.
Sensors (Basel). 2018 Jun 1;18(6):1766. doi: 10.3390/s18061766.
We propose a novel method for generating ±1-order orbital angular momentum (OAM) in long-period fiber gratings (LPFGs) by adjusting a polarization controller (PC). An LPFG, inscribed in a four-mode fiber (4MF) using a CO₂ laser, was used to generate OAM across a broad range of wavelengths from 1530 nm to 1630 nm. Additionally, the OAM vortex phase remained stable while the temperature increased from 23 °C to 50 °C. The LPFG, as a temperature sensor, and its temperature sensitivity was measured to be 38.6 ± 0.37 pm/°C at the resonant wavelength of 1625 nm. This design offers simple fabrication and several properties which are highly beneficial for all-fiber optical communications based on the OAM mode-division multiplexing technique.
我们提出了一种通过调节偏振控制器（PC）产生±1阶轨道角动量（OAM）的新方法。通过使用 CO₂激光在四模光纤（4MF）中写入长周期光纤光栅（LPFG），在 1530nm 至 1630nm 的宽波长范围内产生 OAM。此外，当温度从 23°C 升高到 50°C 时，OAM 涡旋相位保持稳定。该 LPFG 作为温度传感器，其在谐振波长为 1625nm 时的温度灵敏度为 38.6±0.37pm/°C。这种设计具有简单的制造工艺和多种特性，非常有利于基于 OAM 模式复用技术的全光纤光通信。
