Pulse train stability in passively Mode-locked Erbium-doped fiber laser with a nonlinear polarization rotation

Nur Ameelia Abdul Kadir (Universiti Teknologi Malaysia)
Nurul Alina Afifi Norizan (Universiti Teknologi Malaysia)
Azura Hamzah (Universiti Teknologi Malaysia)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 15, No 3: September 2019

A nonlinear polarization rotation technique-based mode-locked erbium-doped fiber laser has been experimentally demonstrated using a 0.75 m long highly concentrated erbium-doped fiber as the gain medium. With unintentional polarization dependent loss induced by twisting single-mode fiber in an intracavity polarization controller, the optical output of the laser shifts from continuous wavelength to modelocked soliton pulse. A stable and cleaner pulse with a repetition rate of 15.32 MHz laser wavelengths and a pulse energy of 0.496 nJ with optical signal-to noise ratio of more than 33 dB are successfully obtained using a simple ring cavity.