Fiber-optic distributed measurement of polarization beat length using slope-assisted Brillouin optical correlation-domain reflectometry

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Figure Captions

Figure 1 Experimental setup of SA-BOCDR-based beat length measurement. EDFA,

erbium-doped fiber amplifier; ESA, electrical spectrum analyzer; FUT, fiber under test;

OSC, oscilloscope; PC, polarization controller; PD, photo diode; PSCR, polarization

scrambler.

Figure 2 Measurement of spectral power distributions. (a) structure of the FUT, R=10.5

cm; (b) power distribution along the FUT, R = 10.5 cm; (c) structure of the FUT, R=7.5 cm;

(d) power distribution along the FUT, R = 7.5 cm; (e) structure of the FUT, R=3.4 cm; (f)

power distribution along the FUT, R = 3.4 cm.

Figure 3 Calculated PSDs (log scale) when R was (a) 10.5 cm; (b) 7.5 cm; (c) 3.4 cm. The

insets show their magnified views around the peaks (linear scale).

Figure 4 Measured beat length plotted as a function of the mandrel radius. The solid curve

is a theoretical trend.

Figure 5 Demonstration of distributed beat length measurement. (a) Structure of the FUT

comprising two sections wound on mandrels with radii (10.5 cm and 3.4 cm). (b) Spectral

power distribution along the FUT with R = 10.5 cm (90–180-m section) and R = 3.4 cm

(180–195-m section). (c) Its magnified view in the 180–195-m section.

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