Spectral variations of the output spectrum in a random distributed feedback Raman fiber laser

Wireless and Photonics Networks Research Center, Faculty of Engineering, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
Optics Express (Impact Factor: 3.49). 07/2011; 19(15):14152-9. DOI: 10.1364/OE.19.014152
Source: PubMed


We report an ultra-long Raman laser that implemented a variable pumping scheme in backward and forward configurations. Rayleigh backscattering effects were realized in the 51 km fiber length that functioned as a virtual mirror at one fiber end. With the employment of a fiber Bragg grating that has a peak reflection wavelength at 1553.3 nm, spectral broadening effects were observed. These occurred as the pump power level was diverted more to the forward direction. Owing to this fact, a maximum width of 0.9 nm was measured at 100% forward pumping. The obtained results show that the efficient exploitation of four-wave mixing interactions as well as strong Rayleigh backscattering are beneficial to influence the lasing performances. Both of these nonlinear responses can be adjusted by varying pumping distributions along the fiber longitudinal dimension.


Available from: Faisal Rafiq Mahamd Adikan
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    • "Since, then, RDF-FLs have been widely studied, due to its simple structure without any " mirrors " and unique output characteristics. These studies related to RDF-FLs include basic emission characteristics [3]– [6], noise and gain optimization [7], [8], high-order and tunable emission [9]–[11], broadband, multi-wavelength, and narrow linewidth outputs [12]–[18]. It is believed that RDF-FL is a good candidate of fiber-optic communication and sensing source, due to its stable output with little thermal sensitivity, wide wavelength tenability, excellent noise and modulation characteristics, spatial incoherence while with a high photonic density of states [19]–[23]. "
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