Abstract
An inline time division multiplexed (TDM) fiber Bragg grating (FBG) interferometric sensor array for low frequency bands was presented. The length of the sensing fiber for each element was 58.78 m and the TDM number was 8, both of which are the largest to the best of our knowledge. Besides, in order to pick up phases stably in this ultra-long array with low background noise, a polarization switching (PS) and crosstalk suppressing method was adopted in which a hybrid interference complex synthesis and phase generated carrier (ICS-PGC) algorithm played an important role. A unified demonstration of the ICS-PGC method suitable for 8 or more TDM channels was presented. Experiments showed that even when the PGC modulation frequency was limited to be 6 kHz, the measured noise level could achieve −92 dB@100 Hz, making the system attractive for low frequency sensing applications.
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