All-polarization-maintaining Femtosecond Erbium-doped Fiber Lasers Using Graphene Oxide Saturable Absorber

We report a graphene oxide mode-locked all-polarization-maintaining erbium-doped fiber laser for the first time. The self-started, environmentally-stable laser directly generates linearly-polarized pulses with 502 fs pulse duration at a repetition rate of 48.2 MHz.