Open AccessASE noise independent small signal modal gain measurements and mode imaging in double clad Nd^3+- doped fiber around 900 nm
Author(s) -
Patrycjusz Stremplewski,
Cz. Koepke
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.024847
Subject(s) - amplified spontaneous emission , optics , materials science , signal (programming language) , spontaneous emission , fiber , modal , optical fiber , noise (video) , physics , laser , image (mathematics) , artificial intelligence , computer science , polymer chemistry , composite material , programming language
The spatially and spectrally resolved mode imaging method (S²) and lock-in detection technique are combined to allow for low signal gain measurements in double clad, Nd³⁺- doped fiber in the spectral region of 900 nm. The combination of these methods gives us the opportunity to measure the low signal gain, without disruption of the result by the amplified spontaneous emission (ASE). Results of the modal gain measurements are compared to numerical calculations.