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A novel scheme for enhancing the multiplexing capacity of low-coherence reflectometric sensors is demonstrated. The scheme is based on connecting the sensing elements in serial in a loop configuration, allowing each of the sensors within the array being interrogated twice from opposite directions. The bi-directional interrogation enhances the multiplexing capacity in terms of maximum sensor number. The bi-interrogation scheme would also allow normal operation of the sensor array even when onedoi:10.1109/lpt.2002.1022001 fatcat:52g5t52gcrgf5luwsc55wtdz64