Abstract
A new technique called hybrid optical spectral and time division multiplexing for passive interferometric fibre optic sensor networks has been developed. The idea of this technique is initially to modulate the optical spectrum with different sub-carrier frequencies at different time interval lasting for a period T. A proper selection for the sub-carrier values could minimise the crosstalk between sensors. The use of a synchronised gating signal at the detector output enables the simultaneous interrogation of signals from different sensors. A two-interferometric sensor network has been demonstrated and a 42 dB crosstalk has been achieved. The salient features of this technique are the simplicity, low crosstalk and high number of permissible sensors.
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