Suppression of Raman gain in single-transverse-mode dual-hole-assisted fiber

Zenteno, L.A.; Wang, J.; Walton, Donnell T.; Ruffin, B.A.; Li, Mingjun; Gray, S.; Crowley, Alana M.; Chen, X.

doi:10.1364/opex.13.008921

Cited by 50 publications

(18 citation statements)

References 7 publications

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“…Some of the most popular include the use of special fiber designs that work as distributed spectral filters [1,2,5] or the use of lumped filtering elements [3,4]. The most widespread distributed filter concepts, w-type [1] and hole-assisted fibers [2], introduce a fundamental mode cut-off at a wavelength shorter than that of the Raman scattering, thereby forbidding its propagation in the fiber. In [1] an Yb-doped fiber amplifier consisting of 23 m of active w-type fiber with 7μm core diameter was demonstrated to suppress Raman.…”

Section: Techniques Of Stimulated Raman Suppressionmentioning

confidence: 99%

Suppression of stimulated Raman scattering in high-power fiber laser systems by lumped spectral filters

et al. 2010

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We present a systematic study on the inhibition of stimulated Raman scattering by lumped spectral filters both in passive optical transport fibers and in fiber amplifiers. This study reveals the parameters that have the strongest influence on the suppression of the Raman scattering (such as the attenuation at the Raman wavelength and the insertion losses at the signal wavelength). These parameters have to be optimized in order to achieve the desired Raman inhibition and/or to minimize the loss in amplifier efficiency. The study is concluded with realistic predictions on the use of spectral filtering elements for Raman scattering inhibition in real-world high power fiber amplifiers. Thus, using for example 10 lumped spectral filters with 20 dB effective Raman attenuation and less than 0.25 dB insertion losses, a maximum Raman threshold increase by a factor of 3 is expected. In this context, long period gratings are proposed as promising filtering elements for Raman inhibition in high power fiber amplifiers. In order to experimentally verify the theoretical predictions and the suitability of long period gratings, a fiber amplifier consisting of 2 m active Ytterbium doped fiber was built. Three long period gratings were consecutively inserted at different positions along the fiber, and the Raman threshold was determined for each situation. It is shown that, with three long period gratings, the Raman threshold (defined as the 20 dB ratio of Raman to signal output power) was increased by about 60%, which offers a good agreement with the theoretical predictions

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Section: Techniques Of Stimulated Raman Suppressionmentioning

confidence: 99%

Suppression of stimulated Raman scattering in high-power fiber laser systems by lumped spectral filters

et al. 2010

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“…Compared with conventional PM fibers, SP fibers provide high extinction ratio, stable polarization state, and low sensitivity to polarization alignment of input signal. The SP fiber can also suppress SRS effect for high power amplifiers [21,22]. To achieve single polarization operation the fiber possesses both high birefringence and fundamental mode cutoff.…”

Section: Mitigating Stimulated Raman Scatteringmentioning

confidence: 99%

Suppressing nonlinear effects for power scaling of high power fiber lasers

Liu

Chen²,

Li³

et al. 2007

SPIE Proceedings

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Suppressing nonlinear effects such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS) in high power fiber amplifiers and lasers is crucial for scaling up output power well beyond kW levels. The paper uses a sophisticated model to analyze many different fiber amplifier designs and compare their performance. The systematic modeling reveals many interesting results and shows that a co-pumped amplifier can be optimized by carefully choosing fiber lengths and applying additional heating to the fiber. It also explains why the amplifier configuration can make great impacts on SBS characteristics. In addition, a single-polarized fiber having an effective area of 206 µm 2 and cutoff wavelength of 1100 nm is designed to suppress SRS and provide better polarization properties. The systematic modeling concludes that in general a counter-pumped fiber amplifier has the lowest nonlinear effects and is less sensitive to the fiber length comparing with the co-pumped amplifiers. However, the co-pumped amplifier is easy to integrate with an all-fiber-based pump combiner without risking LD damage and it can be heated to increase SBS threshold by a factor of 1.7.

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“…In an SRS-limited regime, the SRS suppression should give the filter fiber an overall advantage. A notch in the ASE around 1070nm demonstrates that one can simultaneously filter out SRS and ASE components, unlike fibers that filter by fundamental-cutoff [5]. Redesign of the fiber should offer greater efficiency for both SRS-limited and ASE-limited applications.…”

Section: Filter Fiber Designmentioning

confidence: 99%