Question

4.3 Erbium doped fiber amplifier A glass fiber has been doped with Er$^{3+}$ ions with doping concentration 8 × 10$^{18}$ Er$^{3+}$ ions cm$^{-3}$. Emission and absorption cross-sections of this EDFA at a wavelength of 1550 nm are found to be 3 × 10$^{-21}$ cm$^2$ and 2 × 10$^{-21}$ cm$^2$, respectively. The Er$^{3+}$ doped fiber is pumped from a 1480 nm laser diode. Obtain the maximum gain coefficient in terms of dB m$^{-1}$ of this medium at 1550 nm. You may assume that the maximum gain coefficient is obtained when there is full population inversion ($N_1$ = 0).

          4.3 Erbium doped fiber amplifier A glass fiber has been doped with Er$^{3+}$ ions with doping concentration
8 × 10$^{18}$ Er$^{3+}$ ions cm$^{-3}$. Emission and absorption cross-sections of this EDFA at a wavelength of 1550 nm are
found to be 3 × 10$^{-21}$ cm$^2$ and 2 × 10$^{-21}$ cm$^2$, respectively. The Er$^{3+}$ doped fiber is pumped from a 1480 nm
laser diode. Obtain the maximum gain coefficient in terms of dB m$^{-1}$ of this medium at 1550 nm. You may assume
that the maximum gain coefficient is obtained when there is full population inversion ($N_1$ = 0).

4.3 Erbium doped fiber amplifier A glass fiber has been doped with Er^3+ ions with doping concentration
8 × 10^18 Er^3+ ions cm^-3. Emission and absorption cross-sections of this EDFA at a wavelength of 1550 nm are
found to be 3 × 10^-21 cm^2 and 2 × 10^-21 cm^2, respectively. The Er^3+ doped fiber is pumped from a 1480 nm
laser diode. Obtain the maximum gain coefficient in terms of dB m^-1 of this medium at 1550 nm. You may assume
that the maximum gain coefficient is obtained when there is full population inversion (N1 = 0).

Added by Sarah B.

Question

Please give Ace some feedback