| 1. |
- Eriksson, Tobias A., et al.
(författare)
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Crosstalk Impact on Continuous Variable Quantum Key Distribution in lticore Fiber Transmission
- 2019
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Ingår i: IEEE Photonics Technology Letters. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 1041-1135 .- 1941-0174. ; 31:6, s. 467-470
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Tidskriftsartikel (refereegranskat)abstract
- We investigate the excess noise induced by crosstalk in a trench-assisted homogeneous 19-core fiber for a continuous variable quantum key distribution (CV-QKD) receiver. Crosstalk is studied for both 30 wavelength division multiplexing channels of 24.5-Gbaud PM-16QAM with 100-GHz channel spacing and for an amplified spontaneous emission signal with 37.5-GHz bandwidth. We show that in-band crosstalk from neighboring cores prohibits secret key generation. However, it is possible to place CV-QKD channels at wavelengths not used by the classical channels even though wideband amplified spontaneous emission noise is present. The excess noise induced by crosstalk from a neighboring core is shown to be time-dependent.
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| 2. |
- Eriksson, Tobias A., et al.
(författare)
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Wavelength Division Multiplexing of 194 Continuous Variable Quantum Key Distribution Channels
- 2020
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 38:8, s. 2214-2218
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate the first continuous variable quantum key distribution (CV-QKD) system with fully digital phase and polarization tracking, enabling the first wavelength division multiplexing experiment for CV-QKD. We transmit 194 x 0.5 GHz channels with 25 GHz channel spacing, demonstrating an aggregate estimated asymptotic secret key rate of 172.6 Mbit/s over 25 km.
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| 3. |
- Lundberg, Lars, 1989, et al.
(författare)
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Master-slave carrier recovery for M-QAM multicore fiber transmission
- 2019
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Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 27:16, s. 22226-22236
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Tidskriftsartikel (refereegranskat)abstract
- Master-slave carrier recovery is a digital signal processing technique that uses correlated phase noise in multi-channel receivers to eliminate redundant carrier recovery blocks. In this paper we experimentally investigate the performance of master-slave carrier recovery for multicore fiber transmission in the presence of inter-channel nonlinear interference. Using a triple parallel loop setup we jointly receive three spatial channels in a 7-core fiber for transmission distances of up to 1600 km. We find that an increased launch power causes a moderate penalty on the slave channels. Furthermore, we study the penalty from a non-zero inter-core skew.
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| 4. |
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| 5. |
- Puttnam, Benjamin J., et al.
(författare)
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0.61 Pb/s S, C, and L-Band Transmission in a 125 mu m Diameter 4-Core Fiber Using a Single Wideband Comb Source
- 2021
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 39:4, s. 1027-1032
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Tidskriftsartikel (refereegranskat)abstract
- We investigate high-throughput, multi-band transmission in a 4-core multi-core fiber (MCF) with the same 125 mu m cladding diameter of standard single-mode fiber (SMF). A single wideband comb source is used to transmit up to 561 wavelength channels with 25 GHz spacing over a 120 nm bandwidth in S, C, and L bands. We demonstrate a maximum decoded throughput of 610 Tb/s in PDM-256QAM and PDM-64QAM signals over a 54 km fiber, transmitting more than 155 Tb/s in a single core and measuring a per-core average throughput exceeding record transmission demonstrations in SMF. In addition, we use noise loading measurements to characterize the achievable signal quality across the wideband transmitter. These results show that a single comb source can enable high-spectral efficiency modulation over wide bandwidths and further that low-core count homogeneous MCF technology can offer the same transmission performance as single-mode fibers without sacrificing mechanical reliability, and still offering the benefits of shared resources and greater efficiency that drives SDM technologies.
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| 6. |
- Puttnam, Benjamin J., et al.
(författare)
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Linear block-coding across >5 Tb/s PDM-64QAM spatial-super-channels in a 19-core fiber
- 2015
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Ingår i: 41st European Conference on Optical Communication, ECOC 2015, Valencia, Spain, 27 September - 1 October 2015. - 9788460817413 ; 2015-November
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Konferensbidrag (refereegranskat)abstract
- We apply linear block-codes across 228-bit, PDM-64QAM spatial super-channels in a 19-core fiber and observe upto 3 dB reduced OSNR requirement and additional transmission reach of 55% at BER=3.8×10-3 and 122% at BER=1×10-3 for a 10.5% code overhead.
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| 7. |
- Puttnam, Benjamin J., et al.
(författare)
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Pb/s, homogeneous, single-mode, multi-core fiber systems
- 2016
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Ingår i: 42nd European Conference on Optical Communication, ECOC 2016; Dusseldorf; Germany; 18 September 2016 through 22 September 2016. - 9783800742745 ; , s. 208-210
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Konferensbidrag (refereegranskat)abstract
- We discuss multi Pb/s transmission using homogeneous, single-mode, multi-core fibers. We outline the key components of a recent high capacity demonstration, the consequences of fiber properties and the potential for enhanced efficiency from spatial-super-channel transmission.
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| 8. |
- Rademacher, Georg, et al.
(författare)
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159 Tbit/s C+L Band Transmission over 1045 km 3-Mode Graded-Index Few-Mode Fiber
- 2018
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Ingår i: 2018 Optical Fiber Communications Conference and Exposition, OFC 2018 - Proceedings.
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Konferensbidrag (refereegranskat)abstract
- We transmit 3 x348 x 24.5 Gbaud PDM-16-QAM modulated C+L band channels with a total data-rate of over 159 Tbit/s over 1045 km graded-index three-mode fiber, resulting in a record throughput-distance product of more than 166 Pbit/sxkm.
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| 9. |
- Rademacher, G., et al.
(författare)
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Experimental investigation of a 16-dimensional modulation format for long-haul multi-core fiber transmission
- 2015
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Ingår i: 41st European Conference on Optical Communication, ECOC 2015, Valencia, Spain, 27 September - 1 October 2015. - 9788460817413 ; 2015-November
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Konferensbidrag (refereegranskat)abstract
- We experimentally investigate a 16-dimensional modulation format applicable to multi-core fiber transmission, and demonstrate over 14,000 km transmission for a BER of 1E-3, a 55 % improvement in reach compared to DP-BPSK for the same spectral efficiency.
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