Single-longitudinal mode and single-polarization state E/sub r//sup 3+/-doped fiber compound-ring laser with a M-Z interferometer

A new all-fiber E/sub r//sup 3+/-doped fiber compound-ring laser with a MZ interferometer and a coupler filter is reported. It operates at single-longitudinal-mode and single-polarization state. The mode selection function of the MZI is demonstrated.