Improved design of a DFB Raman fibre laser

Hu, Y.; Broderick, Neil G. R.

doi:10.1016/j.optcom.2009.05.038

Cited by 40 publications

(11 citation statements)

References 12 publications

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“…As mentioned previously the R-DFB signal acts as the pump for FWM. It possesses a nonuniform intensity distribution within the DFB cavity [22][23][24], as seen in Fig. 4.…”

Section: Discussionmentioning

confidence: 99%

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Detailed study of four-wave mixing in Raman DFB fiber lasers

Shi¹,

Horák²,

Alam³

et al. 2014

Opt. Express

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Abstract:We both experimentally and numerically studied the ultracompact wavelength conversion by using the four-wave mixing (FWM) process in Raman distributed-feedback (R-DFB) fiber lasers. The R-DFB fiber laser is formed in a 30 cm-long commercially available Ge/Si standard optical fiber. The internal generated R-DFB signal acts as the pump wave for the FWM process and is in the normal dispersion range of the fiber. Utilizing a tunable laser source as a probe wave, FWM frequency conversion up to ~40 THz has been demonstrated with conversion efficiency > -40 dB. The principle of such a wide bandwidth and high conversion efficiency in such a short R-DFB cavity has been theoretically analyzed. The simulation results match well with the experimental data.

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“…As mentioned previously the R-DFB signal acts as the pump for FWM. It possesses a nonuniform intensity distribution within the DFB cavity [22][23][24], as seen in Fig. 4.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, the amplitudes of the forward, ) ( 1 z A f , and backward, ) ( 1 z A b , R-DFB signals along the DFB grating length of L are given by Eqs. (1) and (2) [23], where κ is the coupling coefficient of the DFB grating. Thirdly, single-mode fiber is utilized and all the overlap integrals of the waves are assumed to be identical to…”

Section: Discussionmentioning

confidence: 99%

Detailed study of four-wave mixing in Raman DFB fiber lasers

Shi¹,

Horák²,

Alam³

et al. 2014

Opt. Express

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“…This would therefore open up the prospect of generating high-power narrow linewidth low-noise oscillation at any desired wavelength ranging from the visible to the infrared region, pending only the availability of a suitable pump source [5][6]. Theoretical studies suggest that Raman DFB fibre lasers could be made comparatively efficient by employing π phase-shifted fibre Bragg gratings of only a few tens of centimetres of passive germanium doped silica fibres, and also that these should exhibit only watt-level threshold [7][8]. Only recently an experimental demonstration of Raman DFB fibre laser operating at 1.58µm was reported [9].…”

Section: Introductionmentioning

confidence: 99%

High power, low threshold, Raman DFB fibre lasers

Shi

Alam

Ibsen

2011

2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim Incorpo

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Abstract:We demonstrate highly efficient Raman gain based distributed-feedback fibrelasers at ~1.11µm with up to 2W CW output-power with <0.01nm linewidth. The lasers are 30cm long and UV-written directly into two types of passive germanosilicate fibres. IntroductionAll-fibre rare-earth doped distributed feedback (DFB) lasers have attracted a lot of interest in recent years [1]. In addition to providing inherent fibre compatibility thereby ensuring low insertion loss, they exhibit numerous excellent optical properties. These include, outstanding beam quality, very low noise characteristics and extremely narrow linewidth, making them very useful sources in a number of applications in telecommunications, range-finding and LIDAR, and sensing [2][3][4]. It is a prerequisite of these sources to have high-concentration of rare-earth ions doping in the core of the fibre to facilitate high efficiency. High concentration of rare-earth ions can lead to problems with output power stability due to pair-ion quenching leading to inefficient pump energy transfer and excessive thermal loading. The operating wavelengths are also limited to regions characteristic to the specific rare-earth material used. A Raman gain based DFB fibre laser could overcome these limitations whilst maintaining all the attractive optical properties. This would therefore open up the prospect of generating high-power narrow linewidth low-noise oscillation at any desired wavelength ranging from the visible to the infrared region, pending only the availability of a suitable pump source [5][6]. Theoretical studies suggest that Raman DFB fibre lasers could be made comparatively efficient by employing π phase-shifted fibre Bragg gratings of only a few tens of centimetres of passive germanium doped silica fibres, and also that these should exhibit only watt-level threshold [7][8]. Only recently an experimental demonstration of Raman DFB fibre laser operating at 1.58µm was reported [9]. The threshold power required for laser oscillation in that case was extremely high at ~40W @1480nm, and only 65mW of output power was obtained at a pump power of 80W, corresponding to a conversion efficiency of only 0.08%.In this work, we experimentally demonstrate 30cm long Raman DFB (R-DFB) lasers in high-NA (0.35) and standard-NA (0.12) passive germanosilica (Ge/Si) fibres with threshold powers in the low watt regime. Up to 2W of CW output power is obtained for a pump power of only 13.7W with a threshold power of only ~1W. In addition to being the highest efficiency R-DFB laser demonstrated to date, it is also the highest ever reported output power from any DFB fibre laser, incl. rare-earth doped DFB fibre lasers, to the best of our knowledge. The highest achieved output power corresponds to a conversion efficiency of 14.6% which is ~182 times higher than the R-DFB reported in [9] The slope efficiencies with respect to the absorbed pump power are ~92% for the high-NA fibre, and ~74% for the low-NA fibre, respectively. The R-DFB fibre lasers oscillate with a linewidth of <0.0...

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“…It was also predicted that mode competition within the grating structure could cause instability of the laser oscillation. In order to reduce the lasing threshold as well as mode competition, R-DFB fiber lasers based in π phase-shifted DFB gratings were studied numerically by Hu and Broderick, and Shi and Ibsen who showed that watt-level threshold R-DFB fiber lasers would be possible from much shorter length π phase-shifted DFB gratings of only several 10 s of centimeters in length [8,9].…”

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confidence: 99%

Sub-watt threshold, kilohertz-linewidth Raman distributed-feedback fiber laser

2012

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We report a low-threshold, narrow linewidth Raman distributed-feedback (R-DFB) fiber laser at 1109.54 nm based on a 30 cm long center π phase-shifted Bragg grating written directly in a commercially available germano-silica (Ge/Si) fiber. The R-DFB was pumped by a continuous-wave (CW) linearly polarized fiber source at 1064 nm, and the threshold power, full width at half-maximum (FWHM) linewidth and slope efficiency with respect to the incident pump power are measured to be 440 mW, <2.5 kHz (measured with a 29.75 km fiber delay line) and 13.5%, respectively. An rf spectrum analyzer confirms that the R-DFB fiber laser exhibits single-frequency performance.

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Improved design of a DFB Raman fibre laser

Cited by 40 publications

References 12 publications

Detailed study of four-wave mixing in Raman DFB fiber lasers

Detailed study of four-wave mixing in Raman DFB fiber lasers

High power, low threshold, Raman DFB fibre lasers

Sub-watt threshold, kilohertz-linewidth Raman distributed-feedback fiber laser

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