Anomalous dispersion in a solid, silica-based fiber.
We demonstrate an all-solid (nonholey), silica-based fiber with anomalous dispersion at wavelengths where silica material dispersion is negative. This is achieved by exploiting the enhanced dispersion engineering capabilities of higher-order modes in a fiber, yielding + 60 ps/nm km dispersion at 1080 nm. By coupling to the desired higher-order mode with low-loss in-fiber gratings, we realize a 5 m long fiber module with a 300 fs/nm dispersion that yields a 1 dB bandwidth of 51 nm with an insertion loss of approximately 0.1 dB at the center wavelength of 1080 nm. We demonstrate its functionality as a critical enabler for an all-fiber, Yb-based, mode-locked femtosecond ring laser.
Ramachandran
S
S
OFS Laboratories, Somerset, New Jersey 08873, USA. sidr@ieee.org
Ghalmi
S
S
Nicholson
J W
JW
Yan
M F
MF
Wisk
P
P
Monberg
E
E
Dimarcello
F V
FV