Noise Characteristics for Random Fiber Lasers with Rayleigh Distributed Feedback
Author | : Bhavaye Saxena |
Publisher | : |
Total Pages | : |
Release | : 2013 |
ISBN-10 | : OCLC:900887218 |
ISBN-13 | : |
Rating | : 4/5 (18 Downloads) |
Book excerpt: Frequency and intensity noise are characterized for Erbium-Doped Fiber and Brillouin random lasers based on Rayleigh distributed feedback mechanism. We propose a theoretical model for the frequency noise of an Er-doped fiber random lasers using the property of random phase modulations from multiple scattering points in ultra-long fibers. We find that the Rayleigh feedback suppresses the noise at higher frequencies by introducing a Lorentzian envelope over the thermal frequency noise of a long fiber cavity. The theoretical model and measured frequency noise agree quantitatively with two fitting parameters. A similar model, which also includes additional acoustic fluctuations and a distributed gain profile in the fiber, has been speculated for the Brillouin random laser. These random laser exhibits a frequency noise level of