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We propose and demonstrate a high performance four-wavelength erbium-dopedfiber laser (EDFL), enabled by a figure-8 compound-ring-cavity (F8-CRC) filterfor single-longitudinal-mode (SLM) selection and a polarization-managedfour-channel filter (PM-FCF) for defining four lasing wavelengths. We introducea novel methodology utilizing signal-flow graph combined with Mason's rule toanalyze a CRC filter in general and apply it to obtain the important designparameters for the F8-CRC filter used in this paper. By combining the functionsof the F8-CRC filter and the PM-FCF filter assisted by the enhancedpolarization hole-burning and polarization dependent loss, we achieve the EDFLwith fifteen lasing states, including four single-, six dual-, four tri- andone quad-wavelength lasing operations. In particular, all the foursingle-wavelength operations are in stable SLM oscillation, typically with alinewidth of <600 Hz, a RIN of <=-154.58 dB/Hz@>=3 MHz and an output powerfluctuation of <=+/-3.45%. In addition, all the six dual-wavelength operationshave very similar performances, with the performance parameters close to thoseof the single-wavelength lasing operations. Finally, we achieve the wavelengthspacing tuning of the dual-wavelength operations for the photonic generation oftunable microwave signals, and successfully obtain a signal at 23.10 GHz as ademonstration.

optics express

Wavelength-switchable ultra-narrow linewidth fiber laser enabled by a  figure-8 compound-ring-cavity filter and a polarization-managed four-channel  filter