Influence of the word length and input power on nonlinear crosstalk induced by hybrid optical amplifiers

•The influence of crosstalk induced by hybrid optical amplifiers has been examined.•It is observed that as the input power increases the crosstalk will also increase.•It is recommended that R–E is the best combination as compared to other HOA.•The investigation of crosstalk has also been done in 16 channel DWDM system.

In this paper, the influence of the word length (WL) of a pseudo-random bit sequence (PRBS) and the input laser power on nonlinear crosstalk induced by the different hybrid optical amplifiers (HOAs) has been examined. It is found that the crosstalk is strongly dependent on the WL and very sensitive to the relative powers of the input signals at 0.2 nm and 0.4 nm of the channel spacing. It is shown that the proposed hybrid Raman–EDFA induces lesser crosstalk as compared to other HOAs. The performance of Raman–EDFA HOA is also investigated for 16 × 10 Gbps dense wavelength division multiplexed (DWDM) system at 0.2 nm of channel spacing.