title: C-band waveguide amplifier produced by femtosecond laser writing.
abstract: An optical waveguide amplifier fabricated on erbium-ytterbium-doped phosphate glass by direct femtosecond laser writing is demonstrated. The waveguides are manufactured using 1040-nm radiation from a diode-pumped cavity-dumped Yb:KYW oscillator, operating at a 885 kHz repetition rate, with a 350 fs pulse duration. Peak internal gain of 9.2 dB is obtained at 1535 nm, with a minimum internal gain of 5.2 dB at 1565 nm. Relatively low insertion losses of 1.9 dB enable for the first time an appreciable net gain in the full C-band of optical communications.
authors.forename: G
authors.initials: G
authors.lastname: Della Valle
authors.forename: R
authors.initials: R
authors.lastname: Osellame
authors.forename: N
authors.initials: N
authors.lastname: Chiodo
authors.forename: S
authors.initials: S
authors.lastname: Taccheo
authors.forename: G
authors.initials: G
authors.lastname: Cerullo
authors.forename: P
authors.initials: P
authors.lastname: Laporta
authors.forename: A
authors.initials: A
authors.lastname: Killi
authors.forename: U
authors.initials: U
authors.lastname: Morgner
authors.forename: M
authors.initials: M
authors.lastname: Lederer
authors.forename: D
authors.initials: D
authors.lastname: Kopf