Abstract

An experimental investigation of the time-domain dynamics of an erbium-doped fiber ring laser is carried out by the loss modulation technique, using an intensity modulator in the ring cavity, in the modulation frequency range of 1–60 kHz. By changing the four control parameters of pumping ratio, modulation frequency, modulation index, and modulator bias voltage, the laser dynamics can be modified all the way from period-1 to the chaotic regime. The presence of period-1, period-2, period-4, higher periods, and chaos confirm that the chaos is achieved through a period-doubling route. However, period-3 and period-6 are also obtained through other routes for certain parametric choices. The effect of the pumping ratio is also discussed. A higher value of pumping ratio requires a higher modulating signal amplitude to push the laser into the chaotic regime until the second laser threshold. Besides this, the chaotic regimes for the higher pumping ratio are wider in frequency and shifted toward higher frequencies. Calculations done with an established theoretical model provide a suitable handle on the parameters and help in emphasizing the control possible in this multiparameter dynamical system.

© 2017 Optical Society of America

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