Infrared and Laser Engineering, Volume. 54, Issue 4, 20250048(2025)
Thermal excitation characterization and defect analysis of fine structure of optical fiber couplers (invited)
Figures & Tables(7)
Fig. 1. Internal structure diagram of single mode 1×3 fiber coupler
Fig. 2. Diagram of experimental device. ( TLS: Tunable laser; OC: Optical fiber coupler; FRM: Faraday rotation mirror; Circulator: Circulator; BPD: Balanced photodetector; PBS: Polarization Beam Splitter ; DAQ: Data acquisition card[17])
Fig. 3. Diagram of connection of strain measuring device. ( Temperature chamber is used to apply temperature excitation；Strain demodulation instrument is used to connect and measure the device under test)
Fig. 5. Measurement results of No.1 optical fiber coupler. (a) Thermal strain relative to reference temperature rise; (b) Thermal strain relative to reference temperature drop
Fig. 6. Strain distribution curve of two optical fiber couplers. (a) Relative reference cooling thermal strain of the second device; (b) Reference cooling thermal strain of the third device
Table 1. Characteristic parameters of three fiber couplers
View tableView in ArticleTable 1. Characteristic parameters of three fiber couplers
Characteristic parameters Sample 1 Sample 2 Sample 3 Length of fused tapering zone/mm 10.5 10.8 9.7 Valley-to-valley difference/µε 52.2 172.4 245.2 Index of asymmetry 10.5% 32.2% 45.7%
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Dengfeng ZHANG, Kunhua WEN. Thermal excitation characterization and defect analysis of fine structure of optical fiber couplers (invited)[J]. Infrared and Laser Engineering, 2025, 54(4): 20250048
Paper Information
Category: Invited research article
Received: Jan. 15, 2025
Accepted: --
Published Online: May. 16, 2025
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