# What are the effects of temperature on optical fiber waveform

I am attempting to measure temperature using a signal through an optical fiber. If I send a waveform through an optical fiber, how would temperature affect it? I've looked here (Calculating Temperature of an Optical Fiber) on this site, but haven't managed to find any actual equations (if any) representing this phenomenon. The closest I've gotten is temperature causing a change in the index of refraction of water, which changes the speed of the wave in accordance with v = c/n as found here: (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6640572/)

• different fibers, having different materials & layers etc, will likely have different variations in the function $n(\lambda)$ as well as potentially a change in the core-cladding index difference, leading possibly to a change in the losses and cladding modes supported. I suspect the best you can do is get a material properties sheet from each vendor. Jun 9 at 12:08