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(a) Schematic (adapted from ref [41]) and (b) picture of the experimental set-up for the pressure sensor characterizations. An IR fiber-laser is coupled to the FP-cavity by means of a circulator. The interference signal is detected by a photodiode (PD). The photocurrent (PC) signal is acquired as a function of the pressure by a computer-controlled digital voltmeter (DVM) connected to the output of a current-to-voltage (I/V) amplifier.
