| 1. |
- Luis, R. S., et al.
(författare)
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Demonstration of a 1 Pb/s spatial channel network node
- 2019
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Ingår i: IET Conference Publications. - : Institution of Engineering and Technology.
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Konferensbidrag (refereegranskat)abstract
- We experimentally demonstrate a petabit-class hierarchical SDM switching node with granularity from 10 Tb/s to 1 Pb/s. We address spatial bypassing network scenarios, optical channel grooming, spatial multiplex section protection switching, and optical channels using coupled and uncoupled spatial channels.
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| 2. |
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| 3. |
- Eriksson, Tobias A., et al.
(författare)
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Digital self-coherent continuous variable quantum key distribution system
- 2020
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Ingår i: Optics InfoBase Conference Papers. - : Optica Publishing Group.
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Konferensbidrag (refereegranskat)abstract
- We investigate a continuous variable quantum key distribution system with digital tracking of both polarization and phase. Stable operation over 25km for 36 hours with secret key rates between 1.9 and 2.8 Mbit/s is demonstrated.
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| 4. |
- Eriksson, Tobias, 1986, et al.
(författare)
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Experimental Investigation of Crosstalk Penalties in Multicore Fiber Transmission Systems
- 2015
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Ingår i: IEEE Photonics Journal. - : Institute of Electrical and Electronics Engineers (IEEE). - 1943-0655. ; 7:1
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally study the impact of crosstalk in multicore fibers, using polarization-multiplexed quadrature phase-shift keying signals. Using a 7-core fiber, we perform single-span transmission experiments, where the level of crosstalk to the core under test can be varied. We find the penalty in the required optical signal-to-noise ratio (OSNR), compared to a system with no crosstalk, for different signal-to-crosstalk ratios and at different pre-forward-error-correction target bit-error rates (BERs). We show that, for a 1-dB penalty, a 15.7-dB signal-to-crosstalk ratio can be tolerated at BER = 1 x 10(-3). We also perform recirculating loop experiments with varying amount of crosstalk per span to find the impact on the achievable transmission distance.
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| 5. |
- Eriksson, Tobias, 1986, et al.
(författare)
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Single parity check-coded 16QAM over spatial superchannels in multicore fiber transmission
- 2015
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Ingår i: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 23:11, s. 14569-14582
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally investigate single-parity check (SPC) coded spatial superchannels based on polarization-multiplexed 16-ary quadrature amplitude modulation (PM-16QAM) for multicore fiber transmission systems, using a 7-core fiber. We investigate SPC over 1, 2, 4, 5 or 7 cores in a back-to-back configuration and compare the sensitivity to uncoded PM-16QAM, showing that at symbol rates of 20 Gbaud and at a bit-error-rate (BER) of 10(-3), the SPC superchannels exhibit sensitivity improvements of 2.7 dB, 2.0 dB, 1.7 dB, 1.3 dB, and 1.1 dB, respectively. We perform both single channel and wavelength division multiplexed (WDM) transmission experiments with 22 GHz channel spacing and 20 Gbaud channel symbol rate for SPC over 1, 3 and 7 cores and compare the results to PM-16QAM with the same spacing and symbol rate. We show that in WDM signals, SPC over hl1 core can achieve more than double the transmission distance compared to PM-16QAM at the cost of 0.91 bit/s/Hz/core in spectral efficiency (SE). When sharing the parity-bit over 7 cores, the loss in SE becomes only 0.13 bit/s/Hz/core while the increase in transmission reach over PM-16QAM is 44 %. (C) 2015 Optical Society of America
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| 6. |
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| 7. |
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| 8. |
- Luis, R. S., et al.
(författare)
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Spectral efficiency limits in crosstalk-impaired multi-core fiber links
- 2018
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. ; 10551
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Konferensbidrag (refereegranskat)abstract
- Downloading of the abstract is permitted for personal use only. We review the latest advances on ultra-high throughput transmission using crosstalk-limited single-mode multicore fibers and compare these with the theoretical spectral efficiency of such systems. We relate the crosstalkimposed spectral efficiency limits with fiber parameters, such as core diameter, core pitch, and trench design. Furthermore, we investigate the potential of techniques such as direction interleaving and high-order MIMO to improve the throughput or reach of these systems when using various modulation formats.
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| 9. |
- Puttnam, Benjamin, et al.
(författare)
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Energy efficient modulation formats for multi-core fibers
- 2014
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Ingår i: 19th OptoElectronics and Communications Conference, OECC 2014 and the 39th Australian Conference on Optical Fibre Technology, ACOFT 2014; Melbourne, VIC; Australia; 6 - 10 Jul. 2014. - 9781922107213 ; , s. 694-696
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Konferensbidrag (refereegranskat)abstract
- We propose and experimentally investigate a family of multi-dimensional modulation formats for multi-core-fibers. Such formats can have power or spectral efficiency advantages or lower symbol energies but implementation difficulties cause an OSNR penalty.
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| 10. |
- Puttnam, Benjamin, et al.
(författare)
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High-capacity MCF transmission with wideband comb
- 2017
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Ingår i: Optics InfoBase Conference Papers. - 2162-2701. ; Part F40-OFC 2017, s. M2J.4-
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Konferensbidrag (refereegranskat)abstract
- We describe experiments combining high core-count, homogeneous single-mode multicore fibers with a wideband comb for high-capacity transmission without high-order MIMO reception and demonstrate wideband transmission with coded modulation up to 12,300 km.
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| 11. |
- Puttnam, Benjamin, et al.
(författare)
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High Capacity Transmission Systems Using Homogeneous Multi-Core Fibers [Invited]
- 2017
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 35:6, s. 1157-1167
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Tidskriftsartikel (refereegranskat)abstract
- We discuss optical transmission using homogeneous, single-mode, multicore fibers. We first describe the key fiber properties that can affect transmission, such as intercore crosstalk and the variation of propagation delay between cores, and the consequences of these properties on spatial super-channel transmission. We then describe a series of experiments and demonstrations of system features including self-homodyne detection and joint spatial superchannel modulation before discussing their suitability to high-capacity transmission.
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| 12. |
- Puttnam, Benjamin, et al.
(författare)
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Impact of inter-core crosstalk on the transmission distance of QAM formats in multi-core fibers
- 2015
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Ingår i: 2015 International Conference on Photonics in Switching. - 9781479988211 ; , s. 55-57
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Konferensbidrag (refereegranskat)abstract
- We investigate the transmission distance of three QAM modulation formats, in the presence of inter-core crosstalk in a 7-core fiber. We show that crosstalk limits transmission distance for all formats with a greater impact on higher order modulation formats. For a crosstalk level equivalent to equal signal launch power in each core, we measure a reduced transmission distance at BER=1.5×10-2 of 17%, 23% and 36% for PDM-QPSK, PDM-16QAM and PDM-64QAM respectively. © 2015 IEEE.
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| 13. |
- Puttnam, Benjamin, et al.
(författare)
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Impact of Intercore Crosstalk on the Transmission Distance of QAM Formats in Multicore Fibers
- 2016
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Ingår i: IEEE Photonics Journal. - 1943-0655. ; 8:2
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Tidskriftsartikel (refereegranskat)abstract
- We investigate the impact of intercore crosstalk on the achievable transmission distance of three square quadrature amplitude modulation (QAM) formats. We show that increasing intercore crosstalk across an 18 dB range starting from -43.4 dB/100 km reduces the achievable transmission distance for all formats, with a greater impact on higher order modulation formats. For a crosstalk level arising from equal signal launch power in each core of a homogeneous 7-core fiber, we measure a reduced transmission distance at BER = 1.5 × 10-2 of 24%, 38% and 54%, for polarization-division-multiplexed-quadrature phase-shift keying (PDM-QPSK), PDM-16QAM, and PDM-64QAM, respectively. Finally, we investigate the potential impact that dynamic crosstalk variation could have in transmission systems based on multicore fiber and estimate the achievable reach for an outage probability of 1 × 10-5 in the presence of dynamically varying intercore crosstalk.
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| 14. |
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| 15. |
- Puttnam, B. J., et al.
(författare)
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0.715 Pb/s transmission over 2,009.6 km in 19-core cladding pumped EDFA amplified MCF link
- 2019
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Ingår i: Optics InfoBase Conference Papers. - : OSA - The Optical Society. - 9781943580538
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Konferensbidrag (refereegranskat)abstract
- We demonstrate 0.715 Pb/s recirculating transmission through 19 cores of 31.4 km MCF amplified with C+L-band, cladding-pumped, multi-core EDFAs; transmitting 345×24.5 GBd PDM-16QAM signals over 2009.6 km for 1.44 Exb/s×km throughput-distance product.
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| 16. |
- Puttnam, B J, et al.
(författare)
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8007 km C + L band transmission over MCF with 19-core cladding-pumped EDFA
- 2019
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Ingår i: 45th European Conference on Optical Communication, ECOC 2019. - : Institution of Engineering and Technology (IET).
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Konferensbidrag (refereegranskat)abstract
- We investigate an MCF link using a C+L-band, 19-core, cladding-pumped EDFA over trans-oceanic distances measuring a fully decoded throughput of 18.6 Tb/s and 14.5 Tb/s at a distance of 8007 km for an inner and outer-ring cores respectively.
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| 17. |
- Puttnam, Benjamin J., et al.
(författare)
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Characteristics of homogeneous multi-core fibers for SDM transmission
- 2019
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Ingår i: APL Photonics. - : AIP Publishing. - 2378-0967. ; 4:2
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Tidskriftsartikel (refereegranskat)abstract
- We describe optical data transmission systems using homogeneous, single-mode, multi-core fibers (MCFs). We first briefly discuss space-division multiplexing (SDM) fibers, observing that no individual SDM fiber offers overwhelming advantages over bundles of single-mode fiber (SMF) across all transmission regimes. We note that for early adoption of SDM fibers, uncoupled or weakly coupled fibers which are compatible with existing SDM infrastructure have a practical advantage. Yet, to be more attractive than parallel SMF, it is also necessary to demonstrate benefits beyond improved spatial spectral efficiency. It is hoped that the lower spread of propagation delays (skew) between spatial channels in some fibers can be exploited for improved performance and greater efficiency from hardware sharing and joint processing. However, whether these benefits can be practically harnessed and outweigh impairments or effort to mitigate cross talk between spatial channels is not yet clear. Hence, focusing on homogeneous MCFs, we first describe measurements and simulations on the impact of inter-core cross talk in such fibers before reporting experimental investigation into the spatial channel skew variation with a series of the experimental results including a comparison with SMF in varying environmental conditions. Finally, we present some system and transmission experiments using parallel recirculating loops that enable demonstration of both multi-dimensional modulation and joint digital processing techniques across three MCF cores. Both techniques lead to increased transmission reach but highlight the need for further experimental analysis to properly characterize the potential benefits of correlated propagation delays in such fibers.
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| 18. |
- Puttnam, B. J., et al.
(författare)
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High Data-Rate and Long Distance MCF Transmission with 19-Core C+L band Cladding-Pumped EDFA
- 2020
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers Inc.. - 0733-8724 .- 1558-2213. ; 38:1, s. 123-130
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Tidskriftsartikel (refereegranskat)abstract
- We describe a series of optical transmission experiments based around single-mode, multi-core fiber (MCF) amplified with 19-core, C+L band erbium-doped fiber amplifier (EDFA). The cladding-pumped amplifier uses two multi-mode pumps in each of C and L band to provide gain bandwidth over more than 75 nm. For recirculating transmission of PDM-16QAM signals on 345 wavelength carriers between 1530.52 nm and 1605.52 nm, we measure 0.715 Pb/s transmission over a distance of 2009 km (64 recirculations), equivalent to a throughput-distance product of 1.44 exabit/s x km. Next, using PDM-QPSK modulation, we investigate trans-oceanic transmission distances, measuring throughputs of 18.6 Tb/s and 14.5 Tb/s in 2 cores after 255 recirculations, a distance of 8007 km. Further, we evaluate the combined EDFA and fiber crosstalk penalties showing a core and wavelength dependence in agreement with previous MCF crosstalk measurements. These results demonstrate the potential of high core-count EDFAs to combine both high capacity transmission over transoceanic distances with benefits of SDM integration.
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| 19. |
- Puttnam, B. J., et al.
(författare)
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Transmission and Crosstalk Measurements in MC-EDFA amplified 19-core link
- 2019
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Ingår i: OECC/PSC 2019 - 24th OptoElectronics and Communications Conference/International Conference Photonics in Switching and Computing 2019. - : Institute of Electrical and Electronics Engineers (IEEE).
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Konferensbidrag (refereegranskat)abstract
- We investigate long-haul, wideband transmission of PDM-QPSK and PDM 16-QAM in an MCF link amplified in a C+L-band,19-core cladding pumped EDFA and measure a combined fiber/EDFA crosstalk penalty of 14% for lone-wavelenetli L-band channel.
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| 20. |
- Puttnam, Benjamin, et al.
(författare)
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Modulation formats for multi-core fiber transmission
- 2014
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Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 22:26, s. 32457-32469
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Tidskriftsartikel (refereegranskat)abstract
- ©2014 Optical Society of America We investigate high dimensional modulation formats for multi-core fibers (MCFs) and spatial superchannels. We show that the low skew variations between MCF cores maybe exploited to generate 'multi-core' formats that offer significant advantages over independently transmitting conventional 4-dimensional formats in each core. We describe how pulse position modulation formats may be transposed to the spatial domain and then investigate a family of modulation formats referred to as core-coding, one of which has the same power and spectral efficiency as polarization switched quaternary phase shift keying but with half of the optical power, potentially improving non-linear tolerance for long distance transmission, albeit at the cost of implementation challenges. Finally, we investigate the application of set-partitioning to multi-core formats using a single-parity check bit transmitted in one quadrature of one polarization in one of the cores and polarization-division multiplexing quadrature phase shift keying data in all remaining cores. We observe that for high core counts, an advantage of almost 3 dB in asymptotic power efficiency may be obtained with negligible impact on spectral efficiency, which translates into experimentally measured reduction in the required optical signal-to-noise ratio of up to 1.8 dB at a bit-error-rate of 10-5 and the same data-rate, and additional transmission reach of up to 20%.
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| 21. |
- Puttnam, Benjamin, et al.
(författare)
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Single parity check multi-core modulation for power efficient spatial super-channels
- 2014
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Ingår i: 2014 European Conference on Optical Communication, ECOC 2014; Cannes; France; 21 September 2014 through 25 September 2014. - 9782954944401 ; , s. Art. no. 6964197-
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Konferensbidrag (refereegranskat)abstract
- We investigate multi-core modulation formats for spatial super-channels using a single parity check on PDM-QPSK symbols. Compared to per-core PDM-QPSK, we show improvements in required OSNR of up to 1.8 dB, with minimal impact on spectral efficiency.
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| 22. |
- Rademacher, G., et al.
(författare)
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10.66 Peta-Bit/s Transmission over a 38-Core-Three-Mode Fiber
- 2020
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Ingår i: 2020 Optical Fiber Communications Conference and Exhibition, OFC 2020 - Proceedings. - : Institute of Electrical and Electronics Engineers Inc..
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Konferensbidrag (refereegranskat)abstract
- We demonstrate transmission of 368-WDM-38-core-3-mode × 24.5-GBaud 64- and 256-QAM signals over 13 km. Record data-rate and spectral-efficiency of 1158.7 b/s/Hz were enabled by a low DMD 38-core-3-mode fiber with high uniformity amongst cores.
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| 23. |
- Rademacher, G., et al.
(författare)
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High capacity transmission with few-mode fibers
- 2019
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 37:2, s. 425-432
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally investigate high-capacity few-mode fiber transmission for short and medium-haul optical links. In separate experiments, we demonstrate C + L band transmission of 283 Tbit/s over a single 30 km span and recirculating loop transmission of 159 Tbit/s over 1045 km graded-index three mode fiber. The first experiment reached a data-rate per fiber mode within 90% of the record data-rates reported in the same transmission bands for single-mode fibers. The second experiment demonstrated the feasibility of reaching high data-rates over long distance few-mode fiber transmission, despite strong impairments due to mode-dependent loss and differential mode delay.
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| 24. |
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