We report efficient second-harmonic generation in several commercially available telecommunication-grade single-mode and multimode optical fibers. We have investigated the effect of standard dopants such as germanium, phosphorous, and fluorine, and find that the efficient second-harmonic generation is associated with germania-related photosensitive color centers. We observed a 1.5% conversion efficiency in single-mode fibers with germanium-, phosphorous-, and fluorine-doped cores and high hydroxyl levels.
© 1988 Optical Society of America
Original Manuscript: April 22, 1988
Manuscript Accepted: June 8, 1988
Published: September 1, 1988
M. A. Saifi and M. J. Andrejco, "Second-harmonic generation in single-mode and multimode fibers," Opt. Lett. 13, 773-775 (1988)