Room-temperature multiwavelength erbium-doped fiber ring laser employing sinusoidal phase-modulation feedback

Abstract

An effective method for achieving a room-temperature multiwavelength erbium-doped fiber ring laser is presented. Simultaneous multiwavelength lasing with 0.5-nm intervals is achieved both experimentally and theoretically by addition of sinusoidal phase modulation in the ring cavity to prevent single-wavelength oscillation.

Switchable dual-wavelength erbium-doped fibre laser utilizing two-channel fibre Bragg grating fabricated by femtosecond laser

“…By cooling EDF in liquid nitrogen, the homogeneous line broadening of EDF can be reduced [4], but such an approach is not suitable for practical use. To realize stable multiwavelength fibre laser at room temperature, various techniques have been developed, such as incorporating a frequency shifter [5], employing hybrid gain medium [6], [7], use of nonlinear polarization rotation [8], using highly nonlinear fibre [9], and most recently, by means of microfibre [10].…”

Single- and dual-wavelength switchable erbium-doped fiber ring laser based on intracavity polarization selective tilted fiber gratings

“…Because of its relatively broad homogeneous excitation, it is difficult to obtain stable and relatively close wavelength spacing oscillations in EDF lasers (EDFLs) at room temperature. Various techniques have been developed to suppress the mode competition induced by the homogeneous broadening of EDF, such as cooling down EDF in liquid nitrogen [1], incorporating a frequency shifter in the cavity [2], employing a hybrid gain medium [3] and utilizing spatial hole burning by inserting a multi-phase shift FBG in a linear cavity fiber laser [4]. Special laser cavity configurations for multi-wavelength operation by incorporating a segment of highly nonlinear photonic crystal fiber or dispersion-shifted fiber have also been reported [5][6][7].…”

Optimization of the multiwavelength erbium-doped fiber laser in a unidirectional cavity without isolator

“…The phase modulator transfers the power at frequency f 0 to that at f 0 ± nf m ͑n =1,2,3,…͒ in each circulation, which makes it feasible to substitute it for the acoustooptic frequency shifter 12 to suppress the homogeneous gain broadening of the EDF and prevent unstable lasing by choosing proper modulation amplitude and frequency.…”