Fig. 6: Experimental setup for both GO-code and single-pulse BOTDA.
From: Genetic-optimised aperiodic code for distributed optical fibre sensors

RF radio frequency, EOM electro-optic modulator, Is. isolator, Cir. circulator, TA tuneable attenuator, PSc polarisation scrambler, SOA semiconductor optical amplifier, FBG fibre Bragg grating, PD photodetector, Acq. acquisition.