OSNR enhancement utilizing large effective area fiber in a multiwavelength Brillouin-Raman fiber laser

• Published in: Laser physics letters 2011-02, Vol.8 (2), p.139-143
• Main Authors: Sonee Shargh, R., Al-Mansoori, M.H., Anas, S.B.A., Sahbudin, R.K.Z., Mahdi, M.A.
• Format: Article
• Language: English
• Subjects: Exact sciences and technology; Fiber lasers; Fundamental areas of phenomenology (including applications); large effective area fiber; Lasers; Nonlinear optics; Optics; Physics; Raman lasers; Rayleigh scattering; Stimulated brillouin and rayleigh scattering; stimulated Brillouin scattering; stimulated Raman scattering; Stimulated raman scattering; cars
• ISSN: 1612-2011; 1612-202X
• DOI: 10.1002/lapl.201010110

We propose a simple Brillouin‐Raman multichannel fiber laser with supportive Rayleigh scattering in a linear cavity without employing any feedback mirrors at the end of cavity. Brillouin and the consequences of Rayleigh scattering work as virtual mirrors. We employ a section of large effective area fiber in addition to a section of dispersion compensating fiber to enhance the optical signal‐to‐noise ratio of multi‐channel Brillouin‐Raman comb fiber laser. We able to produce a flat comb fiber laser with 37 nm bandwidth from 1539 to 1576 nm built‐in 460 Stokes lines with 0.08 nm spacing. Furthermore, this Brillouin‐Raman comb fiber laser has acceptable optical signal‐to‐noise ratio value of 16.8 dB for the entire bandwidth with excellent flatness and low discrepancies in power levels of about 2.3 dB between odd and even channels. (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)