title: Raman fiber distributed feedback lasers.
abstract: We demonstrate fiber distributed feedback (DFB) lasers using Raman gain in two germanosilicate fibers. Our DFB cavities were 124 mm uniform fiber Bragg gratings with a π phase shift offset from the grating center. Our pump was at 1480 nm and the DFB lasers operated on a single longitudinal mode near 1584 nm. In a commercial Raman gain fiber, the maximum output power, linewidth, and threshold were 150 mW, 7.5 MHz, and 39 W, respectively. In a commercial highly nonlinear fiber, these figures improved to 350 mW, 4 MHz, and 4.3 W, respectively. In both lasers, more than 75% of pump power was transmitted, allowing for the possibility of substantial amplification in subsequent Raman gain fiber.
authors.affiliation: OFS Laboratories, 19 Schoolhouse Road, Somerset, New Jersey 08873, USA. westbrook@ofsoptics.com
authors.forename: Paul S
authors.initials: PS
authors.lastname: Westbrook
authors.forename: Kazi S
authors.initials: KS
authors.lastname: Abedin
authors.forename: Jeffrey W
authors.initials: JW
authors.lastname: Nicholson
authors.forename: Tristan
authors.initials: T
authors.lastname: Kremp
authors.forename: Jerome
authors.initials: J
authors.lastname: Porque