Making The Preform For Fiber (IMAGE) Optica Caption The optical fiber used to make the new sensor is made completely of the advanced polymer Zeonex. The diagram shows how the researchers made the preform that was then heated and pulled to make the fiber. Credit Xin Cheng, The Hong Kong Polytechnic University 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.