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Your search keyword '"Stephens, M. F. C."' showing total 31 results
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31 results on '"Stephens, M. F. C."'

1. Trans-Atlantic Real-Time Field Trial Using Super-Gaussian Constellation-Shaping to Enable 30Tb/s+ Capacity

Author

Stephens, M. F. C., primary, Mertz, P., additional, Grubb, S. G., additional, Shartle, G., additional, Kumpera, A., additional, O’Connor, J., additional, Maher, R., additional, Chitgarha, M. R., additional, Doggart, C., additional, Thomson, S., additional, Edirisinghe, S., additional, Afonso, A., additional, Elam, M., additional, Gelov, K., additional, Boyanov, B., additional, Dominic, V., additional, Sanders, S., additional, and Kandappan, P., additional

Published
2021
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9. In-line and cascaded DWDM transmission using a 15dB net-gain polarization-insensitive fiber optical parametric amplifier

Author

Stephens, M. F. C., Tan, M., Gordienko, V., Harper, P., Doran, N. J., Stephens, M. F. C., Tan, M., Gordienko, V., Harper, P., and Doran, N. J.

Abstract

We demonstrate and characterize polarization-division multiplexed (PDM) DWDM data transmission for the first time in a range of systems incorporating a net-gain polarization-insensitive fiber optical parametric amplifier (PI-FOPA) for loss compensation. The PI-FOPA comprises a modified diversity-loop architecture to achieve 15dB net-gain, and up to 2.3THz (~18nm) bandwidth. Three representative systems are characterized using a 100Gb/s PDM-QPSK signal in conjunction with emulated DWDM neighbouring channels: (a) a 4x75km in-line fiber transmission system incorporating multiple EDFAs and a single PI-FOPA (b) N cascaded PI-FOPA amplification stages in an unlevelled Nx25km recirculating loop arrangement, with no EDFAs used within the loop signal path, and (c) M cascaded PI-FOPA amplification stages as part of an Mx75.6km gain-flattened recirculating loop system with the FOPA compensating for the transmission fiber loss, and EDFA compensation for loop switching and levelling loss. For the 4x75km in-line system (a), we transmit 45x50GHz-spaced signals (‘equivalent’ data-rate of 4.5Tb/s) with average OSNR penalty of 1.3dB over the band at 10−3 BER. For the unlevelled ‘FOPA-only’ 25.2km cascaded system (b), we report a maximum of eight recirculations for all 10x100GHz-spaced signals, and five recirculations for 20x50GHz-spaced signals. For the 75.6km levelled system (c), we achieve eight recirculations for all 20x50GHz signals resulting in a total transmission distance of 604.8km.

Published
2017

12. Enhanced superchannel transmission using phase conjugation

Author

Ellis, A. D., primary, Phillips, I. D., additional, Tan, M., additional, Stephens, M. F. C., additional, McCarthy, M. E., additional, Al Kahteeb, M. A. Z., additional, Iqbal, M. A., additional, Perentos, A., additional, Fabbri, S., additional, Gordienko, V., additional, Lavery, D., additional, Liga, G., additional, Saavedra, M. G., additional, Maher, R., additional, Sygletos, S., additional, Harper, P., additional, Doran, N. J., additional, Bayvel, P., additional, and Turitsyn, S. K., additional

Published
2015
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13. Multichannel regeneration of dual quadrature signals

Author

Sygletos, S., primary, McCarthy, M. E., additional, Fabbri, S. J., additional, Sorokina, M., additional, Stephens, M. F. C., additional, Phillips, I. D., additional, Giacoumidis, E., additional, Suibhne, N. Mac, additional, Harper, P., additional, Doran, N. J., additional, Turitsyn, S. K., additional, and Ellis, A. D., additional

Published
2014
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28. Suppression of WDM four-wave mixing crosstalk in fibre optic parametric amplifier using Raman-assisted pumping.

Author

Redyuk A, Stephens MF, and Doran NJ

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.

Published
2015
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29. Numerical investigation of all-optical add-drop multiplexing for spectrally overlapping OFDM signals.

Author

Sygletos S, Fabbri S, Giacoumidis E, Sorokina M, Marom DM, Stephens MF, Klonidis D, Tomkos I, and Ellis AD

Abstract

We propose a novel architecture for all-optical add-drop multiplexing of OFDM signals. Sub-channel extraction is achieved by means of waveform replication and coherent subtraction from the OFDM super-channel. Numerical simulations have been carried out to benchmark the performance of the architecture against critical design parameters.

Published
2015
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30. Improved WDM performance of a fibre optical parametric amplifier using Raman-assisted pumping.

Author

Stephens MF, Phillips ID, Rosa P, Harper P, and Doran NJ

Abstract

We experimentally demonstrate a Raman-Assisted Fibre Optical Parametric Amplifier (RA-FOPA) with 20dB net gain using wavelength division multiplexed signals. We report amplification of 10x58Gb/s 100GHz-spaced QPSK signals and show that by appropriate tuning of the parametric pump power and frequency, gain improvement of up to 5dB can be achieved for the RA-FOPA compared with combined individual contributions from the parametric and Raman pumps. We compare the RA-FOPA with an equivalent-gain conventional FOPA and find that four-wave mixing crosstalk is substantially reduced by up to 5.8 ± 0.4dB using the RA-FOPA. Worst-case performance penalty of the RA-FOPA is found to be only 1.0 ± 0.2dB over all measured OSNRs, frequencies and input powers, making it an attractive proposal for future communications systems.

Published
2015
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31. 1.14 Tb/s DP-QPSK WDM polarization-diverse optical phase conjugation.

Author

Stephens MF, Tan M, Phillips ID, Sygletos S, Harper P, and Doran NJ

Abstract

Optical phase conjugation (OPC) of a polarization-multiplexed comb of 10x114Gb/s DP-QPSK signals has been demonstrated for the first time, occupying a spectral bandwidth of >1 THz (~9 nm). The nonlinear element employed for the OPC was highly nonlinear fiber (HNLF) optimized for the suppression of stimulated Brillouin scattering (SBS) and configured in a bi-directional loop offering polarization diversity. Pump power (each way about the loop) and input signal power to the OPC subsystem were optimized at 29.7 dBm and + 3 dBm respectively producing a Q(2) penalty of ≤ 0.9 dB over all conjugate wavelengths, polarizations and output OSNR (up to 20 dB).

Published
2014
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