Oldenbeuving R M, Song H, Schitter G, Verhaegen M, Klein E J, Lee C J, Offerhaus H L, Boller K-J
University of Twente, Laser Physics and Nonlinear Optics Group, PO Box 217, 7500 AE Enschede, The Netherlands.
Opt Express. 2013 Jul 15;21(14):17042-52. doi: 10.1364/OE.21.017042.
A novel and simple approach to optical wavelength measurement is presented in this paper. The working principle is demonstrated using a tunable waveguide micro ring resonator and single photodiode. The initial calibration is done with a set of known wavelengths and resonator tunings. The combined spectral sensitivity function of the resonator and photodiode at each tuning voltage was modeled by a neural network. For determining the unknown wavelengths, the resonator was tuned with a set of heating voltages and the corresponding photodiode signals were collected. The unknown wavelength was estimated, based on the collected photodiode signals, the calibrated neural networks, and an optimization algorithm. The wavelength estimate method provides a high spectral precision of about 8 pm (5 · 10(-6) at 1550 nm) in the wavelength range between 1549 nm to 1553 nm. A higher precision of 5 pm (3 · 10(-6)) is achieved in the range between 1550.3 nm to 1550.8 nm, which is a factor of five improved compared to a simple lookup of data. The importance of our approach is that it strongly simplifies the optical system and enables optical integration. The approach is also of general importance, because it may be applicable to all wavelength monitoring devices which show an adjustable wavelength response.
本文提出了一种新颖且简单的光波长测量方法。利用可调谐波导微环谐振器和单光电二极管演示了其工作原理。通过一组已知波长和谐振器调谐进行初始校准。利用神经网络对每个调谐电压下谐振器和光电二极管的组合光谱灵敏度函数进行建模。为了确定未知波长，用一组加热电压对谐振器进行调谐，并收集相应的光电二极管信号。基于收集到的光电二极管信号、校准后的神经网络和一种优化算法来估计未知波长。该波长估计方法在1549nm至1553nm波长范围内提供了约8pm（1550nm处为5·10(-6)）的高光谱精度。在1550.3nm至1550.8nm范围内实现了5pm（3·10(-6)）的更高精度，与简单的数据查找相比提高了五倍。我们方法的重要性在于它极大地简化了光学系统并实现了光学集成。该方法也具有普遍重要性，因为它可能适用于所有具有可调波长响应的波长监测设备。
