Microfiber-Based Polarization Beam Splitter and Its Application For Passively Mode-Locked All-Fiber Laser

Nonlinear polarization evolution based on beam splitter (PBS) is a classical technique for passive mode-locking of fiber lasers. Different from commonly used bulky PBS, in this paper all-fiber PBSs composed two parallel coupled microfibers have been proposed and fabricated under the condition appropriate microfiber diameter coupling length. Using our PBSs, passively mode-locked lasers also demonstrated. The results indicate that microfiber-based PBS has advantages simple fabrication, compact size, most importantly, variable extinction ratio operation bandwidth. with generating stable pulses at both 1.0 μm 1.5 wavelength bands comparable performance their counterparts PBSs. It may be step towards true laser other systems.