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Self-referenced optical networks for remote interrogation of quasi-distributed fiber-optic intensity sensors

机译：用于远程询问准分布式光纤强度传感器的自引用光网络

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摘要

Different multiplexing techniques for passively addressing fiber-optic sensors and compensation schemes for overcoming the undesirable optical signal losses to provide self-referenced quasi-distributed sensing from intensity-based fiber-optic point sensors are revisited. Furthermore, a passive wavelength division multiplexing (WDM) network operating in reflective configuration with remote Radio-Frequency self-referenced fiber-optic intensity sensors with electro-optical configuration is proposed. Delay lines in the electrical domain provide more compact sensor-heads and easy-reconfigurable performance of the sensing points. The technique is analyzed following the Z-transform formalism and measurements validating the theoretical model are reported. There are two measurement parameters providing self-referenced remote interrogation for the sensing heads. The paper shows their experimental validation in a 2-sensor network based on tapered SMF micro-displacement sensors, testing sensor self-referencing as well as sensor crosstalk. Those results provide the background to extrapolate them to a quasi-distributed passive CWDM-based 16-sensor network at around 65 km of remote distance from the central office, with possible upgrade to a 25 km-long DWDM-based 48-sensor network.
机译：被动地寻址光纤传感器的不同多路复用技术和用于克服不期望的光信号损耗以提供从基于强度的光点传感器提供自我参考的准分配感测的自我参考的光点传感器。此外，提出了以具有电光配置的远程射频自我参考光纤强度传感器的反射配置中操作的被动波分复用（WDM）网络。电域中的延迟线提供更紧凑的传感器头和传感点的易于可重新配置性能。在Z变换形式主义之后分析了该技术，并验证了验证理论模型的测量。有两个测量参数为传感头提供自引用的远程询问。本文在基于锥形SMF微位移传感器的2传感器网络中显示了它们的实验验证，测试传感器自我参考以及传感器串扰。这些结果提供了将其推断到距中央办公室距离距离65公里的准分配无源CWDM的16传感器网络的背景，可能升级到基于25公里的基于DWDM的48传感器网络。

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