title: Hybrid Brillouin/thulium multiwavelength fiber laser with switchable single- and double-Brillouin-frequency spacing.
abstract: We demonstrate a multiwavelength laser at 2 µm based on a hybrid gain scheme consisting of a Brillouin gain medium and a thulium-doped fiber. The laser has switchable frequency spacing, corresponding to the single and double Brillouin frequency shifts. In the 20 dB bandwidth, seven lasing channels with a frequency spacing of 0.1 nm (7.62 GHz) and eleven channels with a double-spacing of 0.2 nm (15.24 GHz) are obtained. A wavelength tunability of 1.3 nm is realized for both laser configurations by shifting the pump wavelength. Strong four wave mixing is observed in the double-spacing laser resulting in an improved performance: larger number of channels and better temporal stability.
authors.forename: Kai
authors.initials: K
authors.lastname: Hu
authors.forename: Irina V
authors.initials: IV
authors.lastname: Kabakova
authors.forename: Simon
authors.initials: S
authors.lastname: Lefrancois
authors.forename: Darren D
authors.initials: DD
authors.lastname: Hudson
authors.forename: Sailing
authors.initials: S
authors.lastname: He
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton
mesh_terms: D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D013016:Sound; D013685:Telecommunications / Q000295:instrumentation*; D013932:Thulium / Q000737:chemistry*
chemical_list: D013932:Thulium