Wavelength-Division Multiplexed Fiber-Connected Sensor Network for SLource Localization

A fiber-connected source localization sensor network based on optical wavelength-division multiplexing technology is proposed and demonstrated. Thanks to the wavelength-division multiplexed architecture, the signals from the emitter received by different sensors can be identified by different optical carriers, and no clock synchronization or parameter estimation is required at the sensor nodes, which greatly simplifies the entire system. Also, since the received signals are separated in the wavelength domain, the proposed system is suitable for both pulsed and nonpulsed signal source localization, independent of the format of the emitted signal. A proof-of-concept experiment for two-dimensional localization of a wireless fidelity signal is demonstrated. Spatial resolution of less than 17 cm is achieved.