Analysis of Brillouin dynamic grating localized by intensity-modulated correlation-domain technique for distributed fiber sensing

Abstract

We numerically analyzed reflection spectrum of Brillouin dynamic grating localized by intensity-modulated correlation-domain technique. Furthermore, based on the results, we proposed a novel modulation technique achieving better spatial resolution for distributed fiber sensing along a polarization-maintaining fiber.

Recent progress in slope-assisted Brillouin optical correlation-domain reflectometry

“…Their performance has been dramatically enhanced, and even sub-centimeter spatial resolution and real-time operation have been achieved. Another Brillouin-based distributed sensing technique is a correlation-domain technique, which include Brillouin optical correlation-domain analysis (BOCDA) [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] and Brillouin optical correlationdomain reflectometry (BOCDR) . These techniques have not only sub-centimeter spatial resolution but also a unique advantage of random accessibility to measuring points.…”

Measurement range enlargement in Brillouin optical correlation-domain reflectometry based on chirp modulation scheme

“…Among numerous types of fiber-optic sensors, distributed strain and temperature sensors based on Brillouin scattering have been extensively studied. 1) To spatially resolve sensing locations, three major configurations, i.e., time-, [2][3][4][5][6][7][8] frequency-, [9][10][11][12] and correlationdomain techniques, [13][14][15][16][17][18][19] have been developed. A number of strategies for their performance improvement have been documented so far.…”

“…1) To spatially resolve sensing locations, three major configurations, i.e. time-, [2][3][4][5][6][7][8] frequency-, [9][10][11][12] and correlation-domain techniques, [13][14][15][16][17][18][19] have been developed. A number of strategies for their performance improvement have been documented so far.…”

“…A number of strategies for their performance improvement have been documented so far. [3][4][5]7,8,10,11,[14][15][16][17] Needless to say, each configuration has its own advantages and disadvantages, and here we focus on the correlation-domain technique, [13][14][15][16][17][18][19] which has relatively high spatial resolution and random accessibility to sensing points.…”

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

“…As another approach, the polarization dependence of Brillouin scattering has also been used to measure the beat length distributions along optical fibers. [8][9][10] Using a method based on Brillouin optical correlation-domain analysis (BOCDA), [11][12][13][14][15] a high spatial resolution of 2.7 cm was achieved. 8) However, light injection to both ends of the fiber under test (FUT) is not convenient in long-range applications, and preparation for pump and probe light beams is not cost-efficient.…”