Abstract

We report on the first experimental observation of an influence of noise in a pumping diode laser on the appearance of self-induced modulation and self-pulsing in an all-fiber Erbium laser. The diode laser amplitude noise, being a superposition of spectral components, with some of which to match the resonant frequency of relaxation oscillations in the Erbium fiber laser at the pump rate fixed, acts as a disturbing force, being a source of the modulation effects. This disturbance causes the relaxation oscillations of the Erbium fiber laser to become non-dumped and appears as self-modulation and even self-pulsing of the laser output power.

© 2004 Optical Society of America

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References

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  1. S.J.Cruz Vicente, A.Martinez Gamez, A.V.Kir???yanov, Yu.O.Barmenkov, and M.V.Andres, ???Diode-pumped self-Q-switched erbium-doped all-fibre laser,??? Quantum Electron. 34, 310-314 (2004).
    [CrossRef]
  2. A.V.Kir???yanov, N.N.Il???ichev, and Yu.O.Barmenkov, ???Excited-state absorption as a source of nonlinear thermo-induced lensing and self-Q-switching in an all-fiber erbium laser,??? Las. Phys. Lett. 1, 194-198 (2004).
    [CrossRef]
  3. A.N. Pisarchik, Yu.O. Barmenkov, and A.V. Kir'yanov, ???Experimental characterization of the bifurcation structure in an erbium-doped fiber laser with pump modulation,??? IEEE J. Quant. Electron. 39, 1567-1571 (2003).
    [CrossRef]
  4. A.N. Pisarchik, Yu.O. Barmenkov, and A.V. Kir'yanov, ???Experimental demonstration of attractor annihilation in a multistable fiber laser,??? Phys. Rev. E 68, 066211/1-066211/7 (2003).
    [CrossRef]

IEEE J. Quant. Electron. (1)

A.N. Pisarchik, Yu.O. Barmenkov, and A.V. Kir'yanov, ???Experimental characterization of the bifurcation structure in an erbium-doped fiber laser with pump modulation,??? IEEE J. Quant. Electron. 39, 1567-1571 (2003).
[CrossRef]

Las. Phys. Lett. (1)

A.V.Kir???yanov, N.N.Il???ichev, and Yu.O.Barmenkov, ???Excited-state absorption as a source of nonlinear thermo-induced lensing and self-Q-switching in an all-fiber erbium laser,??? Las. Phys. Lett. 1, 194-198 (2004).
[CrossRef]

Phys. Rev. E (1)

A.N. Pisarchik, Yu.O. Barmenkov, and A.V. Kir'yanov, ???Experimental demonstration of attractor annihilation in a multistable fiber laser,??? Phys. Rev. E 68, 066211/1-066211/7 (2003).
[CrossRef]

Quantum Electron. (1)

S.J.Cruz Vicente, A.Martinez Gamez, A.V.Kir???yanov, Yu.O.Barmenkov, and M.V.Andres, ???Diode-pumped self-Q-switched erbium-doped all-fibre laser,??? Quantum Electron. 34, 310-314 (2004).
[CrossRef]

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Figures (6)

Fig. 1.
Fig. 1.

Experimental set-up.

Fig. 2.
Fig. 2.

Oscillograms of output power of the Erbium fiber laser for the different pump driver currents (in brackets - an excess over the first laser threshold). The sets of snapshots (1–6) on each graph (a,b) correspond, respectively, to the cases of non-attenuated (a) and attenuated (b) pump power, i.e., to the same excess over the threshold, but to the different levels of amplitude noise of the pump diode laser.

Fig. 3.
Fig. 3.

Relative (to the pump power, in %) amplitudes of the noise spectral components (measured at 5, 10, 30, 60, and 90 kHz) of the pumping diode laser as a function of applied current of the diode driver. Inset shows overall views of absolute magnitude of the diode noise within the interval 0–100 kHz for the different pump currents (1 - the detector noise, 2–13 mA/1.7 mW, 3–25 mA/8.1 mW, 4–50 mA/22.7 mW, 5–175 mA/99.3 mW, 6–275 mA/153 mW).

Fig. 4.
Fig. 4.

Dependences of Erbium fiber laser power modulation (a) and its relaxation frequency/output power (b) versus the pumping diode power. Filled circles answer to the case where no additional noise is applied (0V); empty triangles correspond to the two different levels of additional white noise applied (1 and 2 V, which correspond, for instance, to the additional noise power of 7 and 14 µW in 250 Hz bandwidth at frequency 50 kHz). The modulation parameter (Fig.4(a)) is calculated as the peak-to-peak to average voltage ratio. No attenuation is set by the attenuator.

Fig.5.
Fig.5.

(a) Snapshots of output power of the Erbium fiber laser operating in the first self-pulsing regime (near the 1-st threshold, 34.5 mA) established due to the influence of the corresponding spectral component of the pumping diode noise as the external ruling parameter. (b) Similar snapshots of the laser operating in the second self-pulsing regime (owing to the ESA-assisted thermal lensing effect in the active fiber [2]), 400 mA. The traces 1, 2, and 3 correspond to the different magnitudes (0, 1, and 2 V) of the additional white noise applied to the diode driver.

Fig. 6.
Fig. 6.

Dependences of the Erbium fiber power modulation (a) and its relaxation frequency/output power (b) versus an excess over the first laser threshold. Filled and empty circles relate to, correspondingly, the cases where no attenuation is set by the attenuator and 40%-attenuation. The modulation parameter (Fig. 6,a) is calculated as the peak-to-peak to average voltage ratio. The case of natural noise level of the pumping diode laser is shown (i.e., no additional noise is applied to the diode driver).

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