Pinkert T J, Böll O, Willmann L, Jansen G S M, Dijck E A, Groeneveld B G H M, Smets R, Bosveld F C, Ubachs W, Jungmann K, Eikema K S E, Koelemeij J C J
Appl Opt. 2015 Feb 1;54(4):728-38. doi: 10.1364/AO.54.000728.
Results of optical frequency transfer over a carrier-grade dense-wavelength-division-multiplexing (DWDM) optical fiber network are presented. The relation between soil temperature changes on a buried optical fiber and frequency changes of an optical carrier through the fiber is modeled. Soil temperatures, measured at various depths by the Royal Netherlands Meteorology Institute (KNMI) are compared with observed frequency variations through this model. A comparison of a nine-day record of optical frequency measurements through the 2×298 km fiber link with soil temperature data shows qualitative agreement. A soil temperature model is used to predict the link stability over longer periods (days-months-years). We show that optical frequency dissemination is sufficiently stable to distribute and compare, e.g., rubidium frequency standards over standard DWDM optical fiber networks using unidirectional fibers.
本文展示了在载波级密集波分复用（DWDM）光纤网络上进行光频传输的结果。建立了埋地光纤土壤温度变化与通过该光纤的光载波频率变化之间的关系模型。荷兰皇家气象研究所（KNMI）在不同深度测量的土壤温度与通过该模型观测到的频率变化进行了比较。通过2×298千米光纤链路进行的九天光频测量记录与土壤温度数据的比较显示出定性的一致性。利用土壤温度模型预测了更长时间段（天 - 月 - 年）内的链路稳定性。我们表明，光频传播足够稳定，可使用单向光纤在标准DWDM光纤网络上分发和比较例如铷频率标准。
