AQ-switched multi-wavelength Brillouin erbium fiber laser with a single-walled carbon nanotube saturable absorber

Abstract

A Q-switched multi-wavelength Brillouin erbium fiber laser (MWBEFL) is demonstrated using a single-walled carbon nanotube-polyethylene oxide (SWCNT-PEO) saturable absorber (SA). The SA is fabricated by cutting off a small part of the developed SWCNT-PEO film and sandwiching it in between two FC/PC (fiber connector/physical contact) fiber connectors. Multi-wavelength combs with ten lasing lines and spacing of 0.158 nm are obtained by the use of 2 km long dispersion compensating fiber as the Brillouin gain medium and a four-port circulator to isolate and circulate the odd-order Stokes signals. Q-switched pulse trains with a repetition rate of 105.2 kHz and a pulse width of 0.996 µs are obtained in the proposed MWBEFL at a 1480 nm pump power of 120 mW and a Brillouin pump power of 5.4 dBm.

Dark pulse emission in nonlinear polarization rotation-based multiwavelength mode-locked erbium-doped fiber laser

“…Both multiwavelength and pulse erbium-doped fiber lasers (EDFLs) [1,2] have wide applications in optical communications, sensors, and instrumentations. Many approaches have been shown so far to achieve multiwavelength lasing at room temperature such as cascaded stimulated Brillouin scattering [3,4] , incorporating a semiconductor optical amplifier and four-wave mixing (FWM) [5] . Recently, nonlinear polarization rotation (NPR) technique is also widely used for both multiwavelength and pulse laser generations due to its simplicity [6,7] .…”