Dynamics of erbium-doped fibre ring laser under cavity-loss modulation

Kumar, G. Anil; Vijaya, R.

doi:10.1016/j.physd.2015.04.006

Cited by 7 publications

(3 citation statements)

References 36 publications

(41 reference statements)

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“…In an earlier work, we have reported the evolution of the dynamics of erbium-doped fibre ring laser (EDFRL) from linear to nonlinear regime by varying the loss in the ring cavity with the change of modulation index and modulation frequency [31]. In the present work, we analyse the nonlinear regime, mainly for its resonance characteristics and chaotic dynamics, both experimentally as well as theoretically by using the appropriate model [14].…”

Section: Nonlinear Regime Of Oscillationmentioning

confidence: 98%

“…For Vpp=10 mV, three resonances are seen near the frequencies of 6.9 kHz, 11.6 kHz and 26 kHz. The ROF measured independently for the laser is 12.3 kHz [31]. The mathematical expression of ROF can be derived by linearizing the equations (3) and (4) [32].…”

Section: Nonlinear Regime Of Oscillationmentioning

confidence: 99%

“…For low frequencies up to 4.2 kHz, the laser gently follows the modulating signal. On further increase in modulation frequency, the laser dynamics has higher periods such as period-2, period-4 and period-8 eventually leading to chaos in the modulation frequency span of 18.5-24 kHz under the period doubling route [31].…”

Section: Chaotic Regimementioning

confidence: 99%

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Dynamical features of loss and pump modulation in an erbium-doped fibre ring laser

Kumar

Vijaya

2015

J. Opt.

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Resonance characteristics, chaotic dynamics and bistable response of the erbium-doped fibre ring laser (EDFRL) are studied in an experiment under cavity-loss modulation at frequencies in the range of 1–35 kHz. With an increase in pumping ratio and modulation index, the resonance frequencies of the ring cavity laser change in agreement with the expectations from the model. A comparison with the calculated results of the pump-modulated laser helps to bring out the differences in the two modulation schemes. The loss-modulated laser is found to be more sensitive in the sub-harmonic range to its dynamical state while the pump-modulated laser is more sensitive in the super-harmonic range. To achieve chaos, pump modulation requires high values of modulation index (∼28%) while it is seen even at very low values (<1%) in loss modulation. Even though both the schemes follow the same period-doubling route to chaos, features such as the presence of bifurcations or chaos at the resonance frequencies are quite different. Loss modulation is more suited to study the chaotic features in EDFRL due to the range of available control parameters. By comparing the strange attractors and Lyapunov exponents of both cases, it is found that the quality of chaos is better in loss modulation.

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Section: Nonlinear Regime Of Oscillationmentioning

confidence: 98%

Section: Nonlinear Regime Of Oscillationmentioning

confidence: 99%