Partially polarized wave-breaking-free dissipative soliton with super-broad spectrum in a mode-locked fiber laser

Abstract

Abstract:We have reported a novel type of partially polarized dissipative soliton in a mode-locked erbium-doped allfiber laser with strong net normal dispersion. The output pulses exhibit as quasi-trapezoid spectral profiles with 3-dB width as large as 83 nm. The maximum pulse energy and peak power approach 75 nJ and 6 kW at the available pump power of 1 W, respectively. Experimental observations show that the polarization state of the broadband dissipative soliton changes along the cavity position from totally to partially polarized, which is distinct from the typical dissipative soliton that is completely polarized throughout the cavity. It is found that the polarization state of mode-locked dissipative solitons strongly depends on the peak power of pulses, and the partially polarized state results from nonlinear phase shift accumulated in laser cavity.

Square Nanosecond Mode-Locked Laser Based on Nonlinear Amplifying Loop Mirror

“…The observed square ns mode-locking could be well understood by nonlinear polarization rotation (NPR) that leading to peak-powerclamped nonlinear phase shifts for different polarizations in sufficiently long fiber cavities, which is demonstrated by various experiments on peak power clamping effects [9], ns harmonic mode-locking [10], ultrashort laser triggered ns mode-locking [11], high-power amplification of square ns pulses [12], and synchronized modulations [9]. The fiber laser cavities were typically hundreds or thousands meters long that support square mode-locking of nanosecond or even microsecond pulse duration [13]. Nevertheless, long fibers unavoidably experience random changes of polarization birefringence under environmental disturbance.…”

Multiple pulses and harmonic mode locking from passive mode-locked Ytterbium doped fiber in anomalous dispersion region

“…This technique relies on the positive kerr nonlinearity and negative dispersion compensation; however, the generated highest pulse energy from oscillator is limited. For the purpose of high energy pulse generation, dissipative soliton (DSs) [13] in operation at net normal dispersion [14,15] and all normal dispersion (ANDi) [16] region provided the other choices. In addition, Lin et al have exhibited the several tens or one hundred nJ pulse from the ANDi PMFLs without additional use of amplifier by the elongation of cavity length [16,17].…”

Tunable SESAM-Based Mode-Locked Soliton Fiber Laser in Linear Cavity by Axial-Strain Applied to an FBG

“…Furthermore, active mode-locked fiber lasers also require additional switching electronics and complex driven modulators [10][11][12]. Particularly, the capability of passively mode-locked fiber lasers to generate ultrafast solitons are of important interest in practical applications such as optical fiber sensing, biomedical diagnostics, material processing, nonlinear optics, terahertz generation and ultrahigh speed communications [13][14][15]. In the field of fiber lasers, numerous types of techniques have been proposed to achieve soliton I. Aporta is with the Photonics Engineering Group, Universidad de Cantabria, 39005 Santander, Spain (e-mail: aportai@unican.es) M. A. Quintela and J. M. Lopez-Higuera are with the Photonics Engineering Group, CIBER-bbn and IDIVAL, Universidad de Cantabria, 39005 Santander, Spain (e-mail: angeles.quintela@unican.es; miguel.lopezhiguera@unican.es) D. Leandro, R.A. Pérez-Herrera and M. López-Amo are with the Electrical and Electronic Engineering department and ISC, Public University of Navarra, 31006 Pamplona, Spain (e-mail: daniel.leandro@unavarra.es; rosa.perez@unavarra.es; mla@unavarra.es) generation and operation, namely nonlinear polarization rotation, nonlinear optical loop mirror, carbon nanotubes, grapheme layer and semiconductor saturable absorber mirrors (SESAM) [16][17][18][19][20][21].…”