Published 2021-09-08
Abstract
A flat and wide gain bandwidth based on serial hybrid fiber amplifier is experimentally demonstrated in this paper. The proposed amplifier consists of a serial combination of erbium doped fiber amplifier and Raman fiber amplifier. Low pump power of 30 mW of 1480 nm pump power is used as a pump unit for erbium amplifier. While 1495 nm pump unit with maximum pump power of 475 mW is used as a pump power for Raman amplifier. At the optimum pump power values and at small input signal power of -25 dBm, a gain flatness bandwidth of 81 nm (1525-1606) with an average gain level of 25 dB is achieved. On the other side, wider gain flatness bandwidth of 100 nm (1520-1620nm) with an average gain level of 14 dB is achieved at large input signal power value of -5 dBm. In addition, the overall gain spectrum and the gain dynamic range are tested under different input signal power range.