A tunable Er3+–doped fiber laser with polarimetric and Mach-Zehnder filters N. Azami, A. Saïssy, M. De Micheli, G. Monnom and D. B. Ostrowsky Eur. Phys. J. AP, 6 3 (1999) 225-228 Published online: 15 June 1999 DOI: 10.1051/epjap:1999176