A novel multiwavelength erbium-doped fiber laser configurationis proposed and demonstrated. The laser can produce simultaneousfour-wavelength lasing oscillations with a minimum wavelength spacing ofonly 0.36 nm in C-band via using two fiber Bragg gratings written in highbirefringence fiber, while ensuring fairly stable room-temperature operation.The laser can also achieve switching modes among four wavelengths bysimple adjustment of two polarization controllers in the cavities. Theconfiguration is based on the polarization hole burning and overlappingcavities principle. The laser has the advantages of simple all-fiberconfiguration, low cost, high stability and operating at room temperature.