Design and fabrication of an intrinsically gain flattened Erbium doped fiber amplifier

B. Nagaraju (1) , M.C. Paul (2) , M. Pal (2) , A. Pal (2) , Ravi K. Varshney (1) , Bishnu P. Pal (1) , S.K. Bhadra (2) , Gérard Monnom (3) , Bernard Dussardier (3)

1 Department of Physics [New Delhi]
2 CSIR Central Glass and Ceramic Research Institute
3 LPMC - Laboratoire de physique de la matière condensée

We report design and subsequent fabrication of an intrinsically gain flattened Erbium doped fiber amplifier (EDFA) based on a highly asymmetrical and concentric dual-core fiber, inner core of which was only partially doped. Phase-resonant optical coupling between the two cores was so tailored through optimization of its refractive index proile parameters that the longer wavelengths within the C-band experience relatively higher amplification compared to the shorter wavelengths thereby reducing the difference in the well-known tilt in the gains between the shorter and longer wavelength regions. The fabricated EDFA exhibited a median gain > 28 dB (gain excursion below ±2.2 dB within the C-band) when 16 simultaneous standard signal channels were launched by keeping the I/P level for each at -20 dBm/channel. Such EDFAs should be attractive for deployment in metro networks, where economics is a premium, because it would cut down the cost on gain flattening filter head.

Domaines: Optique [physics.optics]

B. Nagaraju, M.C. Paul, M. Pal, A. Pal, Ravi K. Varshney, et al.. Design and fabrication of an intrinsically gain flattened Erbium doped fiber amplifier. Optics Communications, 2009, 282 (12), pp.2335-2338. ⟨10.1016/j.optcom.2009.02.063⟩. ⟨hal-00536274⟩