More than 99% of our Internet data is carried by optical fibers but with our data demands increasing, we are pushing our existing fiber networks to their limits. One way to increase the capacity of fibers is to transmit signals with a higher power, but this is usually avoided as transmissions can become distorted. To help with this, researchers at Eindhoven University of Technology have developed a new mathematical tool to better explore how light propagates through optical fibers in this high power, or nonlinear, regime. This new tool could help in the design of the next generation of data transmission optical fiber networks. Results are published in Nature Communications.