High power, ultra-broadband supercontinuum source based on highly GeO2 doped silica fiber

• Main Authors: Jain, Deepak, Sidharthan, Raghuraman, Moselund, Peter M., Yoo, Seongwoo, Ho, Daryl, Bang, Ole
• Other Authors: Robin, Craig A.
• Format: Article
• Language: English
• Published: 2019
• Subjects: Fiber Amplifiers; Large Mode Area Fibers; Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/106841; http://hdl.handle.net/10220/49665; http://dx.doi.org/10.1117/12.2251648
• Institution: Nanyang Technological University

We demonstrate a 74 mol % GeO2 doped fiber for mid-infrared supercontinuum generation. Experiments ensure a highest output power for a broadest spectrum from 700nm to 3200nm from this fiber, while being pumped by a broadband 4 stage Erbium fiber based MOPA. The effect of repetition rate of pump source and length of Germania-doped fiber has also been investigated. Further, Germania doped fiber has been pumped by conventional Silica based photonic crystal fiber supercontinuum source. At low power, a considerable broadening of 200-300nm was observed. Further broadening of spectrum was limited due to limited power of pump source. Our investigations reveal the unexploited potential of Germania doped fiber for mid-infrared supercontinuum generation. This measurement ensures a possibility of Germania based photonic crystal fiber or a step-index fiber supercontinuum source for high power ultra-broad band emission being pumped a 1060nm or a 1550nm laser source. To the best of our knowledge, this is the record power, ultra-broadband, and all-fiberized SC light source based on Silica and Germania fiber ever demonstrated to the date.