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Fig. 2 | PhotoniX

Fig. 2

From: Frequency-swept feedback interferometry for noncooperative-target ranging with a stand-off distance of several hundred meters

Fig. 2

Schematic diagram of the proposed FSFI ranging system with OPL drift compensation. a Optical design. FSS, frequency-swept source; ISO, optical isolator; FC, fiber coupler; PD, photodetector; HIB, heat insulation box; BPD, balanced photodetector; C, collimator; DM dichroic mirror; ML, microchip laser; L, lens; BS, beam splitter; AOM, acoustic-optic modulator; M, reflective mirror. The pink region marks the ranging module and illustrates the optical path to be detected. The blue- and gray-marked regions represent the auxiliary interferometer and frequency-shifted interferometer, respectively. b Schematic of the FSS; PZT, piezoelectric ceramic actuator. c Schematic of the Mach‒Zehnder-type fiber interferometer in HIB. A piece of G652.D fiber is used as the delay line. d Schematic of the data acquisition. AWG, arbitrary waveform generator; DAQ, data acquisition card; HPF, high-pass filter; LIA, lock-in amplifier; PC, computer

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