Experimental Study on Thermal Contact Resistance Improvement for Optical Fiber by Using Low-Melting Temperature Alloy

Wen-Xiao Chu, Hao-Yu Lin, Chi-Chuan Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This paper presents an experimental analysis for minimizing the thermal contact resistance (R) between an optical fiber and copper heat sink by using the low-melting temperature alloy (LMTA) as the thermal interface material (TIM) subject to high-flux operation (up to 250 W .m(-1)). For the cases without LMTA, the temperature rise (Delta T) can easily surpass 195 degrees C at a heating load of 25 W .m(-1). By contrast, Delta T is dramatically reduced to be less than 1 degrees C with LMTA as TIM with a much higher heating power of 150 W .m(-1). The corresponding thermal resistance (R) can be reduced from 6.5-8.2 K .m .W-1 to 0.004-0.013 K .m .W-1. The improvement is far superior to existing studies. Besides, decreasing the surface roughness and increasing contact pressure also help to reduce R, especially for the cases when the LMTA is not melted. As the LMTA melts, a significant reduction of R by 56% is achieved as compared to the case without melting. The effect of surface roughness and contact pressure on the thermal contact resistance is also examined, and it is found that the influences are small once LMTA melts.

Original languageEnglish
Article number014502
Number of pages5
JournalJournal of Electronic Packaging, Transactions of the ASME
Issue number1
StatePublished - Mar 2020


  • thermal contact resistance
  • low-melting temperature material
  • optical fiber
  • contact pressure
  • surface roughness

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