New Hollow-Core Optical Fiber (IMAGE) Optica Caption The fiber's long and thin bubbles of glass reflect light into the fiber's core much in the same way that light reflects off the surface of the soap bubble in the foreground, making it appear iridescent. Credit University of Bath Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.