C-band waveguide amplifier produced by femtosecond laser writing.
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.
Della Valle
G
G
Osellame
R
R
Chiodo
N
N
Taccheo
S
S
Cerullo
G
G
Laporta
P
P
Killi
A
A
Morgner
U
U
Lederer
M
M
Kopf
D
D