Abstract 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.

中文翻译：

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用于准分布式光纤强度传感器远程询问的自参考光网络

摘要 重新审视了用于被动寻址光纤传感器的不同复用技术和用于克服不良光信号损失的补偿方案，以从基于强度的光纤点传感器提供自参考准分布式传感。此外，提出了一种无源波分复用 (WDM) 网络，该网络在反射配置中运行，具有远程射频自参考光纤强度传感器和电光配置。电气域中的延迟线提供更紧凑的传感器头和易于重新配置的传感点性能。该技术按照 Z 变换形式进行分析，并报告了验证理论模型的测量结果。有两个测量参数为传感头提供自参考远程询问。本文展示了他们在基于锥形 SMF 微位移传感器的 2 传感器网络中的实验验证，测试传感器自参考以及传感器串扰。这些结果为将它们外推到距中心局约 65 公里远程距离的基于准分布式无源 CWDM 的 16 传感器网络提供了背景，并可能升级到 25 公里长的基于 DWDM 的 48 传感器网络。