研究目的
Investigating the effect of below-freezing temperature on optical loss of polyimide-coated optical fibers.
研究成果
The study concludes that optical loss in polyimide-coated optical fibers increases at temperatures below –25 ?C due to residual N-methyl-2-pyrrolidone solvent. Annealing the fibers at 300 ?C for three days can eliminate this issue. Moisture content in the coating also affects the fiber's sensitivity to low temperatures.
研究不足
The study is limited to polyimide-coated optical fibers and does not explore other types of coatings or fibers. The effect of humidity on optical loss is briefly mentioned but not extensively studied.
1：Experimental Design and Method Selection:
The study involved thermal tests of polyimide-coated optical fiber samples in a climatic chamber to observe changes in optical loss at temperatures from –70 to +20 ?C.
2：Sample Selection and Data Sources:
Two samples were used, one annealed at 300 ?C for 70 h in air and the other unannealed.
3：List of Experimental Equipment and Materials:
MC-712 climatic chamber, EXFO LTB-1 power receiver, superluminescence fiber radiation source.
4：Experimental Procedures and Operational Workflow:
Optical loss was measured during cooling and heating cycles.
5：Data Analysis Methods:
Thermogravimetric analysis (TGA) was performed to study mass loss and solvent evaporation.
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