A multiplexed sensor network incorporating wavelength-division demultiplexers (WDMs) constructed from birefringent fibre is presented. Experimental results from a hybrid fibre/bulk-optic version exhibit a worst case optical cross-talk, limited by the extinction ratio for the polarisation-splitting fibre component, of −10 dB. Consideration of typical losses for an all-fibre version of the network suggests that, if polarisation-splitting couplers with a −25 dB extinction ratio are employed, up to ten sensors can be multiplexed in this way, with cross-talk maintained below −15 dB.