Stimulated Brillouin scattering in multimode fibers

Savage-Leuchs, Matthias; Bowers, Mark S.; Brown, Andrew J. W.

doi:10.1117/12.479002

Cited by 3 publications

(3 citation statements)

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“…For example, at a wavelength of 1 μm, the ratio Ω B ∕Γ is nearly three orders of magnitude, and a stiff solver allows the use of larger time steps compared to standard numerical techniques, which reduces computational time while maintaining accuracy of the solutions. Results from the model were previously shown to compare well with experiments with no end reflections, 24 which establishes the validity of the calculations.…”

Section: Numerical Examplessupporting

confidence: 71%

“…The theory predicts the experimentally observed dynamic behavior of SBS in fibers with single-frequency laser pulses with durations on the same order as the phonon lifetime. 23,24 The transient theory has been used to theoretically investigate different modulation techniques for the suppression of SBS in optical fibers seeded with phasemodulated light, with the goal of achieving maximum SBS suppression with minimal linewidth broadening. 12,13 The example geometry under consideration is a passive optical fiber with reflections at both ends, as shown in Fig.…”

Section: Theorymentioning

confidence: 99%

“…(10) with the appropriate boundary and initial conditions encompass the transient theory of SBS that has widely been used to study behavior of pulsed and CW laser sources in a Brillouin-active material. 2,12,13,16,[18][19][20][21][22][23][24][26][27][28][29][30] In this work, the proper boundary conditions are presented to include reflections of broad bandwidth laser radiation.…”

Section: Theorymentioning

confidence: 99%

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Stimulated Brillouin scattering in optical fibers with end reflections excited by broadband pump waves

Bowers

Luzod

2019

Opt. Eng.

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The transient theory of stimulated Brillouin scattering (SBS) in optical fibers is used to investigate the effects of weak feedback of incident broadband laser fields exhibiting different spectral shapes. The proper boundary conditions are given for the forward-and backward-propagating electric fields inside the fiber with a finite amount of reflectivity at the fiber ends. When the linewidth of the laser approaches the Brillouin frequency shift, a weak reflection of the laser field overlaps with the SBS gain and can be amplified in the fiber, resulting in an apparent reduction in SBS threshold. It is shown that the spectral shape of the incident field and its overlap with the SBS gain spectrum affects the SBS signal. Numerical examples are presented for incident laser fields that (1) simulate a pulsed, multilongitudinal-mode laser and (2) are a constant amplitude with a sinusoidal phase modulation. For the pulsed field with mode spacing much less than the Brillouin linewidth, calculations show that an end reflection of 0.01% (−40 dB) of the laser field with a linewidth equal to 0.75 of the Brillouin frequency shift can reduce the effective SBS threshold by a factor of 1.5. When the incident laser field is constant amplitude and phase modulated with a sinusoid, calculations predict sharp and distinct enhancement of the reflected power when the ratio of the Brillouin frequency shift to the modulation frequency is an integer for end reflections as low as 0.001% (−50 dB). Experiments performed with a sinusoidal phase modulated signal confirm the theoretical predictions. These results have implications on the design of high-power fiber laser systems that utilize spectral broadening to suppress SBS.

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Section: Numerical Examplessupporting

confidence: 71%

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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Stimulated Brillouin scattering in optical fibers with end reflections excited by broadband pump waves

Bowers

Luzod

2019

Opt. Eng.

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Stimulated Brillouin scattering in optical fibers excited by broad-band pump waves in the presence of feedback

Bowers

Afzal

2013

SPIE Proceedings

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Polarization properties of noise-initiated stimulated Brillouin scattering in linear birefringent fibers

Bowers

2020

J. Opt. Soc. Am. B

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The transient theory of stimulated Brillouin scattering (SBS) is developed for optical fibers with constant modal birefringence along its length and arbitrary polarization of the pump and Stokes fields. SBS is initiated by thermally excited acoustic waves distributed along the length of the optical fiber, and the generated Stokes field fluctuates in time. It is shown that when a single-frequency pump field is launched such that the fiber is nearly equally excited along the slow and fast axes, the generated Stokes field is partially polarized for fiber lengths longer than its polarization beat length, due to temporal fluctuations in power and polarization. The Stokes field degree of polarization is reduced as the birefringence of the fiber is increased. For launched pump polarizations resulting in nonequal excitation along the slow and fast axes of the fiber, the generated Stokes field is preferentially linearly polarized along the principal axis that exhibits the highest Brillouin gain for fibers with birefringence such that its length is greater than twice its polarization beat length. As the fiber birefringence is reduced, the generated Stokes field state of polarization moves towards the launched pump polarization state, with the opposite sense of rotation. Numerical results are presented to quantify these effects as a function of single-pass Brillouin gain, fiber birefringence, and launched pump polarization state.

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Stimulated Brillouin scattering in multimode fibers

Cited by 3 publications

References 0 publications

Stimulated Brillouin scattering in optical fibers with end reflections excited by broadband pump waves

Stimulated Brillouin scattering in optical fibers with end reflections excited by broadband pump waves

Stimulated Brillouin scattering in optical fibers excited by broad-band pump waves in the presence of feedback

Polarization properties of noise-initiated stimulated Brillouin scattering in linear birefringent fibers

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