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Abstract
A multiple wavelength laser source is generated by a Brillouin seed signal and a compacted hybrid Raman / bismuth-based erbium doped fiber amplifier (Bi-EDFA) in a linear cavity. The gain media of the Raman/Bi-EDFA is only a 2.15 m Bi-EDF pumped bi-directionally by two laser diodes (LDs). In comparison to all of the conventional multiple wavelength sources generated via using the same Bi-EDF and LDs, the proposed multiple wavelength source has much more number of lines due to using Raman and EDF amplification.
Highlights
Multiple wavelength fiber laser sources with constant wavelength spacing are of great interest for some applications such as dense wavelength division multiplexing (DWDM) communication systems and optical sensing
The resulted free running spectrum lies between 1570.29 nm and 1572.28 nm in using the two laser diodes (LDs) as the based erbium doped fiber amplifier (Bi-EDFA) pumps
By injecting the Brillouin pump (BP) with the wavelength 1568.6 nm at the peak pump power of 3.5 dBm, the multiple wavelength laser source of about 55 number of Stokes lines is generated. This number of lines is more than that obtained in the multiple wavelength Brillouin erbium fiber lasers (MBEFLs) linear cavity having the same components but BP wavelength is in the EDFA free running wavelength region
Summary
Multiple wavelength fiber laser sources with constant wavelength spacing are of great interest for some applications such as dense wavelength division multiplexing (DWDM) communication systems and optical sensing. In order to increase gain and number of Brillouin Stokes lines, it is customary to use a hybridgain configuration. This idea is evident in multiple wavelength Brillouin erbium fiber lasers (MBEFLs) [8,9]. Since Raman amplification has wider gain bandwidth compared to EDF amplification, the larger number of lines can be generated in this method. This approach is only limited by the available Raman and Brillouin pump sources and optical components. The Stokes power at the end of fiber, Ps(L), is given by [17]: Ps (L) Ps (0) exp[(g R PpLeff /bAeff ) - αsL] (1)
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