Sub-90 fs dissipative-soliton Erbium-doped fiber lasers operating at 16 μm band

Abstract

We present an L-band dissipative soliton (DS) fiber laser, which can deliver 87.5 fs pulses at 1.6 μm band. Numerical simulations are used to confirm the DS generation, and prove the pivotal component of the invisible filter with proper bandwidth in the formation of DS pulses. Such a robust, compact ultrafast laser source with higher pulse energy is hence an excellent seed source for L-band amplifiers. The mechanism revealed in the simulations is helpful to develop a unified theory for understanding various mode-locking regimes in normal dispersion lasers.

Role of the quintic nonlinear refractive term in the stability of dissipative solitons of the complex Ginzburg–Landau equation

“…Let us now turn to the qualitative analysis of the function (11). Using the trial function (2), this function can be approximated by: P = 2δ|ψ| 2 + 2 |ψ| 4 + 2µ|ψ| 6 (12)…”

“…This equation takes into account, in a distributed manner, the dispersion of the cavity, nonlinear effects, gain and loss, and the nonlinear transmission provided by the fast saturable absorber that is an essential part of any passively mode-locked laser. In fact, laser systems described by this equation can be identified as 'dissipative soliton lasers' [3][4][5][6][7]. The convenience of using the CGLE as a master equation resides in the limited number of parameters that govern the pulse dynamics in the cavity [8,9].…”

64-fs L-band Pulse Generation by an All-Fibre Er-Doped Laser

“…Moreover, in lasers operating at net normal dispersion, large bandwidths and high pulse energies are favoured by short fibre cavities. Sub-100-fs L-band pulses can be obtained from fibre lasers exploiting the similariton [8] or dissipative-soliton [9] pulse formation mechanisms [10,11] . However, such laser designs require two segments of different types of EDFs to force the laser operate at 1.6 m, hence two pump diodes.…”

L-band mode-locked femtosecond fiber laser with gigahertz repetition rate

“…In general, for fiber lasers operating at L-band, the population inversion of the EDF should be limited to a low level (30%-40%) to obtain a positive gain at 1.6 μm, while it is negative at 1.55 μm [18]. The low population inversion could be achieved by various approaches, such as controlling the cavity losses [18][19][20], lengthening the EDF [21][22][23], using highly doped fibers [24][25][26], or cascading different types of the EDFs [12,13]. However, no matter which approach is used, the length of the EDF is usually several meters, even tens of meters in some works.…”

“…With shorter EDF, the pulse repetition rate of the laser could be greatly increased, which would benefit a lot for the applications, such as increasing the imaging speed, widening the transmission capacity of optical communications and so on. However, shortening the EDF length causes the operating wavelength shift toward to 1.55 μm, so heavily doped gain fiber and ultralow output ratio are required to make the wavelength stay at 1.6 μm regime [12]. In the work reported by Byun et al [28], an L-band gigahertz fiber laser with 1573 nm central wavelength is presented.…”