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Multiwavelength Laser Comb in L-Band Region with Dual-Cavity Brillouin/Erbium Fiber Laser

A dual-cavity Brillouin/erbium fiber laser (BEFL) demonstrates a multiwavelength output in the L-band region. The system consists of two erbium-doped fiber lasers (EDFLs) that share a length of the single-mode fiber (SMF) to produce a bidirectional Stokes signal. 2×10 lines including the anti-Stokes line with 22 GHz of wavelength spacing are obtained with maximum Brillouin and 980 nm pump powers of 4.8 mW and 92 mW, respectively. The BEFL has a broad tuning range greater than 10 nm. The laser comb has a potential application in future wavelength division multiplexing (WDM) systems.