Amplitude of the dynamic phase gratings in saturable Er-doped fibers

Stepanov, S.; Sánchez, Marcos Plata

doi:10.1007/s00340-010-4246-9

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…The latter variation also shows a significant spectral dependence inside the spectral profile of the Er 3+ fundamental absorption. In a similar way, the saturation of the fiber optical absorption under the influence of the incident light power in the mW scale inside the fundamental absorption spectral range also results in similar changes of the EDF refraction index [17]. This enables, in particular, the formation of the phase (i.e.…”

Section: Discussionmentioning

confidence: 80%

Accelerated two-wave mixing response in erbium-doped fibers with saturable optical absorption

Hernández

Stepanov

Sánchez

2016

J. Opt.

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The contribution of the spatially uniform variation of average optical absorption to the dynamics of the transient two-wave mixing (TWM) response is considered. It is shown theoretically and confirmed experimentally that this transient effect, via dynamic population gratings in erbium-doped fibers (EDFs) can ensure a response nearly two times faster in such gratings as compared to the growth rate of fluorescence uniformly excited under similar conditions, and can also result in an additional overshot in the tail of the TWM response. This additional ‘accelerating’ contribution is of even type, and does not influence the odd transient TWM response for the refractive index component of such gratings in the EDFs reported earlier. It is also shown that this effect can be utilized to monitor the formation of the dynamic grating with an auxiliary probe wave of the essentially different non-Bragg wavelength.

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Section: Discussionmentioning

confidence: 80%

Accelerated two-wave mixing response in erbium-doped fibers with saturable optical absorption

Hernández

Stepanov

Sánchez

2016

J. Opt.

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“…Additionally, using a heavily doped fiber for the saturable absorber enables the formation of Q-switched regimes [33]. The SMF in the linear part of the cavity is ∼5 m longer than in the previous architecture, enabling the control of oscillating modes [16]. A PC in the cavity allows for manipulating lasing polarization states, differing from our previous work [39].…”

Section: Methodsmentioning

confidence: 90%

“…As an alternative design, a compound ring cavity structure incorporating several cascaded or nested fiber rings to form narrow filters [13,14]. In addition, rare-earth doped fibers can also be employed to narrow the linewidth through the ASE gain compression effect and dynamic population grating (DPG) [15,16].…”

Section: Introductionmentioning

confidence: 99%

Observation of Q-switched and continuous wave regimes with mode-hopping in Er-doped fiber lasers incorporating a dynamic population grating

Wen¹,

Fan²,

Wang³

et al. 2023

Preprint

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Dynamic population gratings (DPGs) in rare-earth doped fibers are prevalent devices in fiber lasers for the production of single-longitudinal-mode emission, Q-switched pulses, and wavelength self-sweeping regimes. This study presents a transition from Q-switched state to continuous wave (CW) state, accompanying irregular mode-hopping, in an erbium-doped fiber laser with a heavily-doped DPG centered at 1549.95 nm. Our results demonstrate that the transition between these two states can be achieved by adjusting the pump power. The repetition frequency of the Q-switched pulse increases monotonically with the increasing pump power, while the pulse duration initially narrows and then expands because the reduced peak intensity weakens the nonlinear effect. Additionally, modulation peaks are evident on both the Q-switched pulse train and the CW background, which are induced by the irregular mode-hopping caused by the DPG. Furthermore, we observe that the central wavelength fluctuates within a range of 0.05 nm. These results provide valuable insight into the DPG effect in heavily-doped fibers.

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Wavelength-dependent transition time of gain saturation in an erbium-doped fiber amplifier

2015

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interferometers [6,7]. In these phenomena, the erbium population difference between the ground level 4 I 15/2 and the metastable level 4 I 13/2 was controlled dynamically by introducing resonant pulses. When this type of amplifier is initially pumped, i.e., when the erbium population is in the population inversion condition, the population can be changed from the gain condition to the gain saturation condition through stimulated emission. To enable application of such dynamic effects, it is essential to evaluate the temporal behavior of amplifier gain. In particular, the transition time between the two conditions should be one of the main parameters to be studied.We have previously proposed time-resolved measurement techniques to probe the transient populations of EDFAs using a directly modulated laser diode as a light source. Direct modulation of the laser diode allowed us to obtain the variable pulse parameters freely, including the pulse width, the pulse number, and the pulse interval. The population recovery time in an EDFA was measured via a pump-probe technique [8]. A self-probe method was also applied to study gain saturation dynamics induced by signal pulses in EDFAs [9, 10].However, one advantage of the use of EDFAs is their broadband operation with bandwidths of over 30 nm. The transient properties of an EDFA may depend on the wavelength at which the stimulated emission occurs, because the emission and absorption cross sections generally show wavelength dependence. Therefore, a study of the wavelength-dependent gain dynamics will provide significant information that will be useful for a wide range of applications.In this paper, we report on the wavelength dependence of the transition time from the gain condition to the gain saturation condition as induced by a single signal pulse in an EDFA. To evaluate the transition time, we applied Abstract We report a study of the wavelength dependence of the gain saturation transition time in an erbiumdoped fiber amplifier. A self-probe method that enables us to probe the change of population in an amplifier by using a pulse to induce that change was used to evaluate the transition time over a wavelength range from 1528 to 1559 nm. It was found that the transition time changed from 400 ns to 1.65 μs with increasing wavelength. The wavelength dependence of the transition time was then analyzed using a model to describe the temporal evolution of the erbium population at the input end of a fiber based on McCumber theory.

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Amplitude of the dynamic phase gratings in saturable Er-doped fibers

Cited by 9 publications

References 16 publications

Accelerated two-wave mixing response in erbium-doped fibers with saturable optical absorption

Accelerated two-wave mixing response in erbium-doped fibers with saturable optical absorption

Observation of Q-switched and continuous wave regimes with mode-hopping in Er-doped fiber lasers incorporating a dynamic population grating

Wavelength-dependent transition time of gain saturation in an erbium-doped fiber amplifier

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