| 1. |
- Agrell, Erik, 1965, et al.
(författare)
-
Modulation and detection for multicore superchannels with correlated phase noise [Invited]
- 2018
-
Ingår i: 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings. ; Part F94-CLEO_SI 2018
-
Konferensbidrag (refereegranskat)abstract
- SDM fibers offer new opportunities and challenges for joint transmitter and receiver processing. We review multidimensional modulation and detection theory, describe algorithms for phase tracking and detection over spatial superchannels, and present some experimental results.
|
|
| 2. |
- Alfredsson, Arni, 1989, et al.
(författare)
-
Joint Phase Tracking for Multicore Transmission with Correlated Phase Noise
- 2018
-
Ingår i: - 9781538653432 ; , s. 16-17
-
Konferensbidrag (refereegranskat)abstract
- Space-division multiplexed transmission over multicore fibers offers potential for joint-core processing to compensate for correlated phase noise. We review methods that take advantage of the phase-noise correlation across cores and assess their benefits in terms of transmission reach and pilot-rate requirements.
|
|
| 3. |
- Eriksson, Tobias, 1986, et al.
(författare)
-
Single parity check-coded 16QAM over spatial superchannels in multicore fiber transmission
- 2015
-
Ingår i: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 23:11, s. 14569-14582
-
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
|
|
| 4. |
|
|
| 5. |
- Luis, R. S., et al.
(författare)
-
Spectral efficiency limits in crosstalk-impaired multi-core fiber links
- 2018
-
Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. ; 10551
-
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.
|
|
| 6. |
- Puttnam, Benjamin, et al.
(författare)
-
Energy efficient modulation formats for multi-core fibers
- 2014
-
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
-
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.
|
|
| 7. |
- Puttnam, Benjamin, et al.
(författare)
-
High-capacity MCF transmission with wideband comb
- 2017
-
Ingår i: Optics InfoBase Conference Papers. - 2162-2701. ; Part F40-OFC 2017, s. M2J.4-
-
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.
|
|
| 8. |
- Puttnam, Benjamin, et al.
(författare)
-
High Capacity Transmission Systems Using Homogeneous Multi-Core Fibers [Invited]
- 2017
-
Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 35:6, s. 1157-1167
-
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.
|
|
| 9. |
- Puttnam, Benjamin J., et al.
(författare)
-
Characteristics of homogeneous multi-core fibers for SDM transmission
- 2019
-
Ingår i: APL Photonics. - : AIP Publishing. - 2378-0967. ; 4:2
-
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.
|
|
| 10. |
- Puttnam, Benjamin, et al.
(författare)
-
Modulation formats for multi-core fiber transmission
- 2014
-
Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 22:26, s. 32457-32469
-
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%.
|
|
