Wideband full double-pass serial hybrid fiber amplifier utilizing L-shape configuration

Abstract

In this work, a new, to the best of our knowledge, full double-pass serial hybrid fiber amplifier is simulated on OptiSystem 7.0 software. A wideband flat gain spectrum covered both conventional and long communication bandwidth ( C + L ) from 1530 to 1590 nm, which is approximately 60 nm with high average gain of 23.6 dB; acceptable noise figure of 7 dB is achieved via the L-shape configuration. The main innovative step in the proposed design is decreasing the cascading amplification effect between the combined amplifiers, by making the individual full double-pass for the input signal in each amplifier stage.

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

“…in addition, almost the same noise figure values were recorded for both the amplifier's setups but with higher values compared with values at a small input signal power regime due to the saturation effect. Under a large input signal power regime, our results illustrate an enhancement of 18.75% in flatness gain bandwidth compared with the results of [14].…”

“…A broad flat amplification bandwidth of 80 nm from 1530 to 1610 nm, which covers both C-and L-band regions with an average gain level of 28.5 and 24 dB, respectively, is achieved at a small input signal power of -30 dBm for setups A and B. Our results show an enhancement of 17.19% and 18.75% in average gain level and flatness gain bandwidth, respectively, as compared with a recently published paper [14].…”

“…As mentioned in Figure 2b, saturation happened in setup B in the erbium emission peak, which directly affects the erbium peak gain in the C-band region and the tail gain of the erbium in the L-band region and subsequently reduced the gain in setup B. At a small input signal power, the flatness gain bandwidth and average gain improved by 29.41% and 17.5%, respectively, as compared with other results [14]. Lower noise figure values were achieved in the C-band region for setup A, being almost 4 dB lower than the noise figure values of setup B as a result of the higher gain level achieved in setup A.…”

“…The early saturation of setup A makes it infeasible for real application because no flatness gain could be achieved for the inserted signal power greater than -27 dBm. In reference to the recently published work presented by [14], no gain dynamic range results were obtained. More results were obtained to show the performance of the proposed amplifiers (setups A and B).…”

“…The paper presents the latest DP-SHFA with an L-shaped arrangement using OptiSystem software and a sole pumping source of 1480 nm. The amplification effect is reduced by the recommended design of the combined amplifiers, exposing them to full dualpass for the signal input in specific stages of different amplifiers, particularly in terms of the NF [14]. The field of HFA is contributed by the proposed design by adopting a new L-shaped configuration for a double-pass Raman fiber amplifier (RFA)/EDFA in the dual-pass configuration and obtaining an average gain of 23.6 dB, and a pumping power of about 300 mW.…”