US 12,442,669 B2
Integrated system for optical fiber sensing and communication through sharing co-frequency resources
Lianshan Yan, Chengdu (CN); Haijun He, Chengdu (CN); Lin Jiang, Chengdu (CN); Anlin Yi, Chengdu (CN); Xihua Zou, Chengdu (CN); and Wei Pan, Chengdu (CN)
Assigned to SOUTHWEST JIAOTONG UNIVERSITY, Sichuan (CN)
Filed by SOUTHWEST JIAOTONG UNIVERSITY, Chengdu (CN)
Filed on Aug. 25, 2023, as Appl. No. 18/456,144.
Application 18/456,144 is a continuation of application No. PCT/CN2023/102068, filed on Jun. 25, 2023.
Prior Publication US 2024/0426640 A1, Dec. 26, 2024
Int. Cl. H04B 10/071 (2013.01); G01D 5/353 (2006.01); H04B 10/07 (2013.01); H04B 10/50 (2013.01); H04B 10/516 (2013.01); H04B 10/61 (2013.01); H04B 10/64 (2013.01)
CPC G01D 5/35329 (2013.01) [G01D 5/35335 (2013.01); G01D 5/35354 (2013.01); G01D 5/35361 (2013.01); G01D 5/3538 (2013.01); H04B 10/07 (2013.01); H04B 10/071 (2013.01); H04B 10/50 (2013.01); H04B 10/516 (2013.01); H04B 10/61 (2013.01); H04B 10/64 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An integrated system for optical fiber sensing and communication through sharing co-frequency resources, characterized in that, a transmission optical signal and a sensing detection light are generated by the same laser, transmission performance and sensing performance of the system are changed by adjusting modulation power of a transmission signal, the transmission signal is obtained by using direct detection at far-end, a sensing signal is obtained by using heterodyne coherent detection at local-end, and a specific structure is:
continuous light output from a continuous wave laser (1) is divided into two paths after passing through a 90:10 fiber coupler A(2), 90% of the continuous light of an upper branch is injected into a mach-zehnder modulator A(4) after being adjusted by a polarization controller A(3), the mach-zehnder modulator A(4) operates in a carrier suppression modulation mode, the mach-zehnder modulator A(4) is driven by a linear FM signal generated by an arbitrary waveform generator (5) to generate a linear FM optical sideband, and light output from the mach-zehnder modulator A(4) passes through an optical filter (7) after being amplified by an erbium-doped fiber amplifier A(6), to retain only +1-order or −1-order sidebands and remove all remaining optical signals; a linear FM optical carrier output by the optical filter (7) is injected into a mach-zehnder modulator B(9) after adjusting a polarization state by a polarization controller B(8), the mach-zehnder modulator B(9) is driven by a transmission signal generated from another port of the arbitrary waveform generator (5), an optical signal output from the mach-zehnder modulator B(9), after compensating for optical power loss by an erbium-doped fiber amplifier B(10), is injected into an optical fiber (12) via an optical fiber annular (11), and an optical signal output from a far end of the optical fiber (12) is converted into an electrical signal with a photodetector (13), and is subjected to digital signal processing after being acquired by a data acquisition device (14); scattered light generated in the optical fiber (12) is output via a third port of the annular (11), output continuous light is coupled with continuous light output from a 10% output arm of the fiber coupler A(2) by a fiber coupler B(15) with a splitting ratio of 1:1, the 10% output arm of the fiber coupler A(2) is used as local light, two output arms of the fiber coupler B(15) are injected into two input ends of a balance detector (16) respectively, to perform photoelectric conversion, and an electrical signal output from the balance detector (16) is subjected to post-processing after being acquired by a data acquisition card (17).