Widely flatness gain bandwidth with double pass parallel hybrid fiber amplifier

Abstract

A Widely flatness gainbandwidth with double pass parallel hybrid fiber amplifier is experimentally demonstrated in this study. The proposed design combines serial erbium-Raman fiber amplifier in one branch and Raman fiber amplifier in the second branch. Multiple Raman pump units with a maximum power of 800 mW (250 mW of 1410 nm, 225 mW of 1480 nm, and 325 mW of 1495 nm) are utilized. Pump recycling technique is applied to achieve acceptable pumping efficiency. A maximum flatness gain bandwidth of 80 nm (1525-1605 nm) and average gain level of 22.5 dB are obtained at a small input signal power of -25 dBm and optimum pump power values. By comparison, a wider flatness gain of 90 nm (1520-1610 nm) and average gain level of 11.5 dB are achieved at a large input signal power of -5 dBm.

Broadband flat amplification based on fully double-pass configuration in serial hybrid fiber amplifier

“…Second, a DP-PHFA [9] is contrasted with our results and showed a higher pump power, lower average gain level, and narrow flatness gain bandwidth. Third, a combination of double-pass serial parallel hybrid fiber amplifier (DP-SPHFA) [10] is collated with our results, which showed a lower pump power, the same flatness gain bandwidth, and lower noise figure values. Finally, a comparison is performed with FDP-SHFA [14].…”

“…To assess the performance of the proposed amplifier setups, a comparison is performed between our results and those of different double-pass configurations presented by [8,9,10], [14], as illustrated in Table 1.…”

“…Dual-pass for comparable alignment has a strong pumping power, with an increased NF of roughly 8 dB, and distribution correction. The hybrid serial/parallel approach was developed [10,11,12,13]. Although the combination method solves the dispersion problem in dual PHFA (DP-PHFA), it has several disadvantages, including high suction energy of about 800 mW, a high NF of 10 dB, and the use of triple sources of injection or pumping.…”