| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 739404 | Optics & Laser Technology | 2014 | 6 Pages |
•A single-wavelength pump LD is used for pump shaing the C+++L band amplifier.•Power equalization among channels is realized by optimizing the FBGs reflectivity.•A pump reflector is used to recycle the residual pumping power.•Optimum dispersion compensation the individual band channels using FBGs.•Bit error rate performance for C+L band amplifier is experimentally verified.
We proposed and demonstrated a 100 km hybrid C+L band fiber amplifier in the bridge-type scheme. It is composed of a C-band erbium-doped fiber amplifier (EDFA) and an L-band Raman fiber amplifier (RFA) using double-pass dispersion compensators in a loop-back scheme. Dispersion slope mismatch is compensated precisely for all C+L band channels by writing fiber Bragg gratings (FBGs) at appropriate locations. Gain variation among multiple channels can be reduced to ±0.2 dB. The pump efficiency is improved by recycling the residual pump power. The C/L band WDM coupler which at merged point rejects C band amplified spontaneous emission (ASE) using L band coupler and vice versa. Both the simulation results and experimental measurements are realized in this paper. The hybrid EDFA/RFA may find vast applications in WDM long-haul systems and optical networks.
