Optimization of gain bandwidth and gain ripple of a hybrid Raman/parametric amplifier for access network applications

Peiris, S.; Madamopoulos, Nicholas; Antoniades, N.; Ummy, Muhammad A.; Ali, M.A.; Dorsinville, R.

doi:10.1364/ao.51.007834

Cited by 5 publications

(6 citation statements)

References 33 publications

(39 reference statements)

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“…Here, φ(z) describes the relative phase difference between the four involved light waves [16]. The linear phase mismatch Δβ is related to the fiber third-and fourth-order dispersion parameters β3 and β4, as in Equation (7) [7,17]. Note that the inclusion of the fourth-order dispersion parameters β4 is very important, as its omission may lead to either overestimation or underestimation of the gain bandwidth [7].…”

Section: Signals Outmentioning

confidence: 99%

“…The linear phase mismatch Δβ is related to the fiber third-and fourth-order dispersion parameters β3 and β4, as in Equation (7) [7,17]. Note that the inclusion of the fourth-order dispersion parameters β4 is very important, as its omission may lead to either overestimation or underestimation of the gain bandwidth [7]. In our model, we have assumed that the state of polarization (SOP) on the incoming signals and pumps are aligned.…”

Section: Signals Outmentioning

confidence: 99%

“…It exhibited a 208-nm bandwidth and a gain in excess of 10 dB; however, a very high gain ripple of ~12 dB [5] made it inappropriate for network-type applications; furthermore, the effect of the generation of multiple idler wavelengths from the parametric process was not addressed. Recently, we presented the results for a 170-nm bandwidth HROPA with <4 dB gain ripple and minimum gain of 20 dB using only three pumps operating only at the upper band (e.g., 1450 nm-1610 nm) of the CWDM wavelengths [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of a Hybrid Raman Optical Parametric Amplifier in the O- and E-Bands for CWDM PONs

et al. 2014

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We describe a hybrid Raman-optical parametric amplifier (HROPA) operating at the O-and E-bands and designed for coarse wavelength division multiplexed (CWDM) passive optical networks (PONs). We present the mathematical model and simulation results for the optimization of this HROPA design. Our analysis shows that separating the two amplification processes allows for optimization of each one separately, e.g., proper selection of pump optical powers and wavelengths to achieve maximum gain bandwidth and low gain ripple. Furthermore, we show that the proper design of optical filters incorporated in the HROPA architecture can suppress idlers generated during the OPA process, as well as other crosstalk that leaks through the passive optical components. The design approach enables error free performance for all nine wavelengths within the low half of the CWDM band, assigned to upstream traffic in a CWDM PON architecture, for all possible transmitter wavelength misalignments (6 nm) from the center wavelength of the channel band. We show that the HROPA can achieve error-free performance with a 170-nm gain bandwidth (e.g., 1264 nm-1436 nm), a gain of >20 dB and a gain ripple of <4 dB. OPEN ACCESSPhotonics 2014, 1 474

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Section: Signals Outmentioning

confidence: 99%

Section: Signals Outmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of a Hybrid Raman Optical Parametric Amplifier in the O- and E-Bands for CWDM PONs

et al. 2014

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“…By optimising the HNLF properties together with the pump powers and frequency tuning, gain in excess of 10 dB over a 208-nm bandwidth in fiber optical amplifier combining parametric and Raman gain has been demonstrated [13]. In paper [14], the authors have described a mathematical model and presented simulation results for the optimization of a RA-FOPA, exhibiting a bandwidth of 170 nm and low ripples. The relationship between the overall gain and different combinations of Raman and parametric pump powers have been investigated both theoretically and experimentally using a single channel signal [15].…”

Section: Introductionmentioning

confidence: 99%

Suppression of WDM four-wave mixing crosstalk in fibre optic parametric amplifier using Raman-assisted pumping

Redyuk¹,

Stephens²,

Doran³

2015

Opt. Express

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Abstract:We perform an extensive numerical analysis of Raman-Assisted Fibre Optical Parametric Amplifiers (RA-FOPA) in the context of WDM QPSK signal amplification. A detailed comparison of the conventional FOPA and RA-FOPA is reported and the important advantages offered by the Raman pumping are clarified. We assess the impact of pump power ratios, channel count, and highly nonlinear fibre (HNLF) length on crosstalk levels at different amplifier gains. We show that for a fixed 200 m HNLF length, maximum crosstalk can be reduced by up to 7 dB when amplifying 10x58Gb/s QPSK signals at 20 dB net-gain using a Raman pump of 37 dBm and parametric pump of 28.5 dBm in comparison to a standard single-pump FOPA using 33.4 dBm pump power. It is shown that a significant reduction in four-wave mixing crosstalk is also obtained by reducing the highly nonlinear fibre interaction length. The trend is shown to be generally valid for different net-gain conditions and channel grid size. Crosstalk levels are additionally shown to strongly depend on the Raman/parametric pump power ratio, with a reduction in crosstalk seen for increased Raman pump power contribution.

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“…With a Raman laser, parametric amplification and wavelength conversion windows have been extended to the S band [3]. In addition, there have been many efforts to achieve gain enhancement up to 27 dB, tailor the gain profile, and optimize the noise figure close to 3 dB [4][5][6][7]. Unfortunately, the previous studies focused mostly on the unsaturated (linear gain) but not the saturation regime of Raman-assisted FOPAs.…”

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confidence: 99%

Gain saturation in a Raman-assisted fiber optical parametric amplifier

Guo

Shu

2013

Opt. Lett.

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We investigate the gain saturation characteristics in a backward-pumped Raman-assisted fiber optical parametric amplifier (FOPA). It is experimentally observed that the onset of saturation occurs at a higher input power as compared to the case of a conventional FOPA with the same unsaturated gain. The output power under strong saturation is also enhanced. Simulations are performed on the power profile of the parametric pump to explain the distinct saturation behaviors. The monotonic increase of the parametric pump power in the Raman-assisted FOPA results in highly efficient power transfer to the signal while it suppresses the signal conversion to high-order idlers in the saturation regime.

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Optimization of gain bandwidth and gain ripple of a hybrid Raman/parametric amplifier for access network applications

Cited by 5 publications

References 33 publications

Performance Analysis of a Hybrid Raman Optical Parametric Amplifier in the O- and E-Bands for CWDM PONs

Performance Analysis of a Hybrid Raman Optical Parametric Amplifier in the O- and E-Bands for CWDM PONs

Suppression of WDM four-wave mixing crosstalk in fibre optic parametric amplifier using Raman-assisted pumping

Gain saturation in a Raman-assisted fiber optical parametric amplifier

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