Optimization of O-Band Praseodymium-Doped Optical Fiber Amplifier in a CWDM Communication Link

In this paper, a Praseodymium-doped fiber amplifier (PDFA) operating in O-band (1276 nm to 1356 nm) is reported. The performance is evaluated by optimizing PDF length, Praseodymium (Pr<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup>) concentration, its doping radius along with the numerical aperture (NA), pump power and input power to the PDFA in terms of small signal gain and noise figure (NF). Small signal gain >25.23 dB has been observed for the wavelength region of 1276 nm to 1356 nm with a maximum gain of 44.56 dB at 1312 nm. The NF varying in the range of 4.1 dB to 8.2 dB has been obtained. Furthermore, the performance of the PDFA is analyzed in a coarse wavelength division multiplexing (CWDM) transmission link of a fiber-optic communication system at a data rate of 10 giga bits per second (Gbps) as a pre-amplifier based on the quality factor (Q-factor). An errorless transmission with a Q-factor >6 over 90 km of conventional single-mode fiber (SMF) has been achieved.