High efficiency supercontinuum generation using ultra-long Raman fiber cavities

El-Taher, Atalla; Ania-Castañón, Juan Diego; Karalekas, V.; Harper, Paul

doi:10.1364/oe.17.017909

Cited by 37 publications

(19 citation statements)

References 13 publications

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“…The BB probe for the amplifier characterization in this work was derived using a supercontinuum (SC) source [13]. The spectral shape of the probe was adjustable by tuning the SC pump power.…”

Section: Methodsmentioning

confidence: 99%

Broadband Gain-Spectrum Measurement for Fiber Optical Parametric and Raman Amplifiers

Gordienko

Stephens

Doran

2017

IEEE Photon. Technol. Lett.

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Abstract-We examine the use of a depolarized broadband probe to experimentally measure gain spectra of amplifiers comprising parametric and Raman gain. The suggested technique allows a quick and accurate characterization of gain spectra spanning more than 100 nm. We derive formulas for processing spectral data to address polarization dependent gain and idler generation, and consequently develop a measurement methodology for obtaining reliable results. We demonstrate the viability of this approach by performing an experimental comparison with results obtained using tunable lasers. We expect the technique described here to be useful for fiber optical parametric amplifier development and characterization.Index Terms-Gain measurement, Optical parametric amplifiers, Raman scattering, Broadband amplifiers.

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Section: Methodsmentioning

confidence: 99%

Broadband Gain-Spectrum Measurement for Fiber Optical Parametric and Raman Amplifiers

Gordienko

Stephens

Doran

2017

IEEE Photon. Technol. Lett.

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“…The key datasheet parameters of the HNLF were: λ 0 = 1550.5 ± 1 nm, g = 14 W ⋅m -1 , measured at 1550 nm. To accurately measure the FOPA gain [9], a depolarized supercontinuum [10] was used as an input probe, ranging from 1520 nm to 1700 nm. A calibrated set of tap couplers and power meters and an optical spectrum analyzer (OSA) were used to non-intrusively measure pump power and optical spectra at the input and output of the HNLF.…”

Section: Figure 1 Example Analytical Fopa Gain Spectrum From Eq (3)mentioning

confidence: 99%

Towards wide-bandwidth ultra-flat FOPAs

Gordienko

Stephens

Doran

2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

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Fibre optical parametric amplifiers (FOPAs) offer the potential for high gain and >100 nm bandwidth at arbitrary wavelengths for increased transmission capacity. We will cover the main principles of the FOPA and discuss our approach to obtaining broad flat gain and performance improvement via simultaneous Raman amplification. Keywords: optical parametric amplifiers, broadband amplifiers, Raman scattering. INTRODUCTIONModern optical transmission systems are approaching the nonlinear Shannon limit, and techniques are being explored to extend performance beyond it [1]. An alternative way of enhancing capacity is to increase the transmission bandwidth (BW). Some fibres, such as OFS AllWave ® allow low-loss (<0.32 dB/km ) transmission over a wide range (1310 -1625 nm). This presents an available BW of 44 THz, with only ~9 THz covered by C and L-band Erbium-doped fibre amplifiers (EDFAs). The development of amplifiers capable of providing one-stage amplification over the full transmission band would offer a fivefold transmission capacity increase.The most promising amplifiers capable of operating in that window are the fibre Raman amplifier (FRA) and the FOPA. However, the gain BW of FRA has so far been limited to ~100 nm, and requires multiple (>5) pumps [2]. Conversely, a single-pump FOPA with a total gain BW >30 THz has been demonstrated [3]. Additionally, the FOPA has a higher gain coefficient than FRA, and the FOPA can operate in a phase-sensitive regime enabling noise figures below 3 dB [4]. However, the FOPA still has numerous challenges -for example, the unidirectional nature of the gain prohibits backward pumping and means pump noise can transfer to signals. Secondly, the FOPA suffers from four-wave mixing between signals leading to crosstalk. Thirdly, pump power is limited by stimulated Brillouin scattering (SBS), and techniques used to mitigate it (such as pump dithering) cause signal degradation [5]. Finally, it is difficult to obtain polarization insensitive gain, although recent progress has been made [6]. This paper reviews the FOPA principle and recent achievements of wide gain BW operation suitable for signal amplification. We will explore how Raman gain from the parametric pump can be used to extend FOPA gain BW.

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“…The pulse breakup will affect the depletion of the pump pulse and amplification of the Stokes pulses. There are few works that are related to this problem, especially related to supercontinuum generation and Raman amplification [20]. Figure 8 shows the experimental setup, the setup used as a source of pump pulse is a diode laser with λ = 1528 nm.…”

Section: Figurementioning

confidence: 99%

Stimulated Raman Scattering for All Optical Switches

Flores-Rosas¹,

Kuzin²,

Díaz-Hernández³

et al. 2017

Raman Spectroscopy and Applications

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We theoretically and experimentally investigate an all optical switch based on stimulated Raman scattering in optical fibers. The experimental setup consists of a Raman circuit of two stages connected in series through a bandpass filter. In the first stage, we have a saturated amplifier, in this stage the pump pulses are saturated when pump and signal are launched to the input or the pump pulses remain without saturation when pump only is launched at the input. The second stage works as the Raman amplifier; for this stage amplification is directly dependent on the pump power entering from the first stage. For the case when pump pulse only is launched at the input pass to the second stage without saturation and amplifies the signal entering in the second stage, very intense signal pulses appear at the output of this stage. For the case when both pump and signal pulses are launched to the input, the pump pulse is saturated in the first stage and the filter rejected the amplified signal, so that only low power pump enters the second stage and consequently no signal pulses appear at the output. We show that the contrast can be improved when using fibers with normal and anomalous dispersion connected in series in the first stage. The best contrast (the ratio of energies) obtained was 15 dB at 6 W pump peak power.

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High efficiency supercontinuum generation using ultra-long Raman fiber cavities

Cited by 37 publications

References 13 publications

Broadband Gain-Spectrum Measurement for Fiber Optical Parametric and Raman Amplifiers

Broadband Gain-Spectrum Measurement for Fiber Optical Parametric and Raman Amplifiers

Towards wide-bandwidth ultra-flat FOPAs

Stimulated Raman Scattering for All Optical Switches

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