I am amateur RG member worked on Quantum Optics research works. My Lab setup does need to use Er or Yb doped fibers which is sensitive to the core diameters of the available Er doped fibers.
Please, if you or someone else who had ever presented with a few characteristics of Er or Yb doped Fibers being:
1) Core diameters for a few common Er doped fibers, e.g. Liekki’s ER110-4/125, ER16-8/125 and MetroGain’s M5-980-125, M12-980-125?
2) While setting up optical paths for doped Fiber’s collimator/coupler, how should I take the Core or Cladding diameter to calculate the MFD (Mode Field Diameter), EFL (Focus Length), divergence and max. waist distance?
3) What are the 532nm and 633nm beam "absorption and emission” graphs for those doped fibers shown in above?
4) While working beams passing through doped fibers, it is required that the mixing parasitic 532nm and 633nm beams may get absorbed (insertion loss) by > 20 - 30 dB. Then, what those fiber’s lengths will be so as to make the output beams right (by assuming I cannot insert a pre-filter into the optical path before entering the doped fiber)?
Hope the inquiries of mine shown are OK for you to understand.