Multi-wavelength generation of brillouin stokes signals for (DWDM) communication systems

In this study, firstly, the tunability of the multiwavelength Brillouin erbium fiber laser is experimentally enhanced by utilizing an absorber passive erbium doped fiber. The laser comb shows a wide tuning range of 65 nm in the absence of self lasing cavity. 62.5 % enhancement in the tuning range in our proposed structure compared with the configuration without passive Erbium doped fiber. In addition, the number of the generated Stokes lines was not affected and up to 13 single Brillouin frequency shift output channels having a peak power of 6 dBm are generated. Secondly, the stimulated Brillouin scattering threshold is experimentally investigated based on ring cavity Brillouin fiber laser. Threshold power for the 1st Stokes signal is improved and reduced up to 90% in ring cavity structure compared to its value in conventional technique. Thirdly, we experimentally propose simple and widely tunable multiwavelength Brillouin erbium fiber laser with triple Brillouin frequency spacing. In the developed structure, we achieved six triple Stokes lines with high peak power and large optical signal to noise ratio of more than 45 dB. Wide tuning range of 50 nm in the absence of self lasing cavity modes is recorded. Fourthly, we propose and experimentally demonstrate quadruple Brillouin-shift wavelength spacing utilizing multiwavelength Brillouin–Erbium fiber laser (MBEFL) cavity. The proposed structure has a tuning range of 60 nm (1530 nm–1590 nm) in the absence of self lasing cavity modes. Four stable Brillouin Stokes with high output power are achieved. Finally, we experimentally proposed widely tunable multiwavelength Brillouin erbium fiber laser with quintuple Brillouin frequency spacing. In the developed structure, at port1, we achieved four quintuple Stokes lines of about 10 dB peak power and large optical signal to noise ratio of more than 50 dB. Wide tuning range of 40 nm (1540–1580 nm) in the absence of free running modes is recorded.