Title :
Low-noise extended L-band phosphorus co-doped silicate EDFA consisting of novel two-stage gain-flattened gain blocks
Author :
Masuda, Hiroji ; Miyamoto, Yutaka
Author_Institution :
NTT Network Innovation Labs., NTT Corp., Yokosuka
Abstract :
A novel low-noise extended L-band silicate erbium-doped fibre amplifier (EDFA) is proposed, consisting of two novel gain-flattened gain blocks for wavelength-division multiplexing (WDM) signals from 1562.2 to 1619.6 nm. Each gain block consists of three isolated phosphorus/alumina co-doped silicate EDFs, an intermediate embedded gain flattening filter (GFF), a short wavelength pump laser diode, and a pump bypass and/or a recycle path. The proposed EDFA, which uses only three pump laser diodes, has achieved noise figures as much as 6.1 dB lower than those realised by an earlier EDFA, when its intermediate optical attenuator has large signal losses and the input signal power is low.
Keywords :
alumina; erbium; optical attenuators; optical communication equipment; optical fibre amplifiers; optical fibre communication; optical filters; optical losses; optical noise; optical pumping; phosphorus; wavelength division multiplexing; EDFA; SiO2:Er,P,Al2O3; WDM; erbium-doped fibre amplifiers; gain flattening filter; gain-flattened gain blocks; input signal power; low-noise extended L-band silicate; noise figures; optical attenuator; phosphorus-alumina codoped silicate; pump bypass; short wavelength pump laser diode; signal losses; wavelength 1562.2 nm to 1619.6 nm; wavelength-division multiplexing;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20081520
