Efficient one-third harmonic generation in highly Germania-doped fibers enhanced by pump attenuation

• Main Authors: Huang, Tianye, Shao, Xuguang, Wu, Zhifang, Lee, Timothy, Sun, Yunxu, Lam, Huy Quoc, Zhang, Jing, Brambilla, Gilberto, Shum, Perry Ping
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2014
• Subjects: DRNTU::Science::Physics::Optics and light
• Online Access: https://hdl.handle.net/10356/101373; http://hdl.handle.net/10220/18385
• Institution: Nanyang Technological University

We provide a comprehensive study on one-third harmonic generation (OTHG) in highly Germania-doped fiber (HGDF) by analyzing the phase matching conditions for the step index-profile and optimizing the design parameters. For stimulated OTHG in HGDF, the process can be enhanced by fiber attenuation at the pump wavelength which dynamically compensates the accumulated phase-mismatch along the fiber. With 500 W pump and 35 W seed power, simulation results show that a 31% conversion efficiency, which is 4 times higher than the lossless OTHG process, can be achieved in 34 m of HGDF with 90 mol. % GeO2 doping in the core.