Eight-wavelength Er-doped fiber lasers with lasing wavelength separations o
f similar to 1.6 and similar to 0.8 nm, respectively, have been achieved by
use of overlap-written fiber Bragg gratings (OWFBG's) in the fiber lasers
and by cooling of the Er-doped fiber with liquid N-2. Our experiment shows
that by utilizing the OWFBG's to select the lasing wavelengths one can achi
eve fiber lasers with lasing wavelengths and lasing wavelength separations
that match the International Telecommunication Union channel-allocation gri
d well. (C) 2000 Optical Society of America OCIS codes: 140.3510.