Sonee Shargh R., Ahmad Hambali N.A.M., Ajiya M., Mahdi M.A.
Farhangian University Hasheminezhad Campus, Mashhad, Iran; Semiconductor Photonics and Integrated Lightwave Systems (SPILS), Tun Abdul Razak Laser Laboratory (TAReL), School of Microelectronic Engineering, Universiti Malaysia Perlis, Pauh Putra Main Campu
Sonee Shargh, R., Farhangian University Hasheminezhad Campus, Mashhad, Iran; Ahmad Hambali, N.A.M., Semiconductor Photonics and Integrated Lightwave Systems (SPILS), Tun Abdul Razak Laser Laboratory (TAReL), School of Microelectronic Engineering, Universiti Malaysia Perlis, Pauh Putra Main Campus, Perlis, Arau, Malaysia; Ajiya, M., Department of Electrical Engineering, Faculty of Engineering, Bayero University, PMB, Kano, Nigeria; Mahdi, M.A., Wireless and Photonic Networks Research Center, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
In this paper we experimentally demonstrate the effect of large effective area fiber length on the performance of a multiwavelength Brillouin-Raman fiber laser in which the forward and backward generated Stokes lines due to Brillouin scattering are combined together through a 3 dB coupler. Thus, the demonstrated laser is dubbed a forward-backward scattering combination multiwavelength Brillouin-Raman fiber laser (FBSC-MBRFL). This laser system utilizes a large effective area fiber and a dispersion compensating fiber that act as Brillouin and Raman gain media, respectively. It is demonstrated that by employing forward pumping schemes, the demonstrated laser system is capable of generating a good flat amplitude Brillouin Stokes line with an average optical to noise ratio of 17 dB along the spectral spans. However, the backward pumping scheme is able to produced high bandwidth spans. At the optimal large effective area fiber length of 50 km, a Raman pump power of 1100 mW at Brillouin pump wavelengths of 1550 mm and 1560 nm is identified to produce the maximum bandwidth with values of approximately 28.45 nm and 24.08 nm, respectively. © 2015 IOP Publishing Ltd.