Title :
Quantum limited noise figure operation of high gain erbium doped fiber amplifiers
Author :
Lumholt, Ole ; Povlsen, Jørn H. ; Schusler, Kim ; Bjarklev, Anders ; Dahl-Petersen, Svend ; Rasmussen, Thomas ; Rottwitt, Karsten
Author_Institution :
Electromagn, Inst., Tech. Univ. of Denmark, Lyngby, Denmark
fDate :
8/1/1993 12:00:00 AM
Abstract :
Performance improvements obtained by using an isolator as an amplified-spontaneous-emission-suppressing component within erbium-doped fibers are evaluated. Simultaneous high-gain and near-quantum-limited noise figures can be obtained by such a scheme. The noise figure improves for input signal powers below -5 dBm, and an improvement of 2.0 dB with a simultaneous gain increase of 4.1 dB is measured relative to a gain-optimized fiber. The optimum isolator location is evaluated for different pump and signal wavelengths in both an Al/Er-doped and a Ge/Er-doped fiber, for pump and signal power variations and different pump configurations. In all cases the optimum isolator position lies within 10-37% of the total fiber length for small signal operation
Keywords :
erbium; fibre lasers; noise; optical communication equipment; optical isolators; optical pumping; optimisation; superradiance; 4.1 dB; Al2O3-SiO2:Er; EDFA; Er-doped fibre amplifiers; GeO2-SiO2:Er; amplified-spontaneous-emission-suppressing component; gain-optimized fiber; high gain erbium doped fiber amplifiers; input signal powers; near-quantum-limited noise figures; optical isolators; optimum isolator location; pump configurations; pump power; pump wavelengths; signal power variations; signal wavelengths; simultaneous gain increase; small signal operation; total fiber length; Doped fiber amplifiers; Erbium; Erbium-doped fiber amplifier; Filters; Gain measurement; Isolators; Noise figure; Noise measurement; Spontaneous emission; Wavelength measurement;
Journal_Title :
Lightwave Technology, Journal of
