| 1. |
- Eriksson, Tobias, 1986, et al.
(författare)
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625 Gbit/s Superchannel Consisting of Interleaved DP-16QAM and DP-QPSK with 4.17 bit/s/Hz Spectral Efficiency
- 2012
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Ingår i: European Conference on Optical Communications (ECOC), Amsterdam, The Netherlands, paper P4.11.
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Konferensbidrag (refereegranskat)abstract
- Abstract (40-Word Limit): We experimentally investigated a superchannel consisting of 25 GHz spaced interleaved 3x18.67 GBaud DP-QPSK and 3x18.67 GBaud DP-16QAM. We showed a 0.3 dB improvement in the Q-value averaged over the center two channels compared to an all DP-16QAM superchannel with the same SE after transmission over 480 km and 560 km of SSMF.
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| 2. |
- Eriksson, Tobias, 1986, et al.
(författare)
-
Achievable Rates Comparison for Phase-Conjugated Twin-Waves and PM-QPSK
- 2016
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Ingår i: 21st OptoElectronics and Communications Conference, OECC 2016 - Held Jointly with 2016 International Conference on Photonics in Switching, PS 2016, Niigata, Japan, 3-7 July 2016. - 9784885523052 ; , s. TuB3-3
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Konferensbidrag (refereegranskat)abstract
- Phase-conjugated twin-waves (PCTW)-QPSK is experimentally compared to PM-QPSK in terms of achievable information rate for bit-wise decoders. For typical long-haul transmission distances, PM-QPSK with soft-decision FEC achieves significantly higher spectral efficiency than PCTW-QPSK.
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| 3. |
- Eriksson, Tobias, 1986, et al.
(författare)
-
Biorthogonal modulation in 8 dimensions experimentally implemented as 2PPM-PS-QPSK
- 2014
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Ingår i: Optical Fiber Communication Conference, OFC 2014. - Washington, D.C. : OSA. - 9781557529930 ; , s. Art. no. 6886984-
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Konferensbidrag (refereegranskat)abstract
- We experimentally demonstrate biorthogonal modulation in 8 dimensions as binary pulse-position modulation polarization-switched QPSK. We compare this format with PM-QPSK at the same bit rate and show a 1.4 dB sensitivity gain and 84 % increased transmission distance.
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| 4. |
- Eriksson, Tobias, 1986, et al.
(författare)
-
Comparison of 128-SP-QAM and PM-16QAM in long-haul WDM transmission
- 2013
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Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 21:16, s. 19269-19279
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Tidskriftsartikel (refereegranskat)abstract
- We investigate 128-level set-partitioning quadrature amplitude modulation (128-SP-QAM) experimentally and compare the performance to polarization-multiplexed 16QAM both at the same bit rate and at the same symbol rate. Using a recirculating loop we study both single channel and wavelength-division multiplexing (WDM) transmission and demonstrate a reach of up to 2680 km at a bit-error rate of 10−3 for 128-SP-QAM. We confirm that 128-SP-QAM has an increased sensitivity compared to PM-16QAM and show that the maximum transmission distance can be increased by more than 50 % at the same bit rate for both single channel and WDM transmission. We also investigate the performance at the same symbol rate as a possible fall back solution in a degrading link.
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| 5. |
- Eriksson, Tobias, 1986, et al.
(författare)
-
Experimental comparison of PS-QPSK and LDPC-coded PM-QPSK with equal spectral efficiency in WDM transmission
- 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. 6964035-
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Konferensbidrag (refereegranskat)abstract
- We compare QPSK with a rate 0.75 LDPC-code and PS-QPSK, which have the same spectral efficiency, in long-haul WDM transmission. We show that LDPC-coded PM-QPSK can achieve up to 98% increased transmission distance over uncoded PS-QPSK at BER = 10-3.
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| 6. |
- Eriksson, Tobias, 1986, et al.
(författare)
-
Experimental Demonstration of 128-SP-QAM in Uncompensated Long-Haul Transmission
- 2013
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Ingår i: 2012 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2013, Anaheim, 17-21 March 2013. - 9781479904570 ; , s. OTu3B.2-
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Konferensbidrag (refereegranskat)abstract
- We demonstrate 128-SP-QAM experimentally for the first time and compare the performance to PM-16QAM at the same symbol rate (10.5 Gbaud). We find a 1.7 dB increased sensitivity and 50% increased transmission reach over PM-16QAM.
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| 7. |
- Eriksson, Tobias, 1986, et al.
(författare)
-
Experimental Investigation of a Four-Dimensional 256-ary Lattice-based Modulation Format
- 2015
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Ingår i: 2015 Optical Fiber Communications Conference and Exhibition, OFC 2015, Los Angeles, United States, 22-26 March 2015. - 9781557529374
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Konferensbidrag (refereegranskat)abstract
- A four-dimensional modulation format with 256 point from the D4-lattice (256-D4) is compared to PM-16QAM in experiments. 256-D4 is more sensitive at high OSNR but with a 21.3% overhead turbo product code, PM-16QAM outperforms 256-D4.
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| 8. |
- 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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| 9. |
- Eriksson, Tobias, 1986, et al.
(författare)
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Four-Dimensional Estimates of Mutual Information in Coherent Optical Communication Experiments
- 2015
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Ingår i: European Conference on Optical Communications (ECOC), Valencia, Spain, 27 September - 1 October 2015. - 9788460817413 ; 2015-November
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Konferensbidrag (refereegranskat)abstract
- Mutual information is experimentally investigated for long-haul coherent transmission. Receivers that consider memoryless four-dimensional noise distributions can achieve significantly higher rates than receivers assuming two-dimensional symmetric distributions.
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| 10. |
- Eriksson, Tobias, 1986, et al.
(författare)
-
Frequency and polarization switched QPSK
- 2013
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Ingår i: 39th European Conference and Exhibition on Optical Communication, ECOC 2013; London; United Kingdom; 22 September 2013 through 26 September 2013. - : Institution of Engineering and Technology. - 9781849197595 ; 2013:622 CP, s. 816-818
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Konferensbidrag (refereegranskat)abstract
- We propose 8-dimensional biorthogonal modulation as a format with 3 dB increased asymptotic power efficiency over PM-QPSK. We demonstrate one possible experimental implementation of this format based on frequency and polarization switching and compare with dual-carrier PM-QPSK and PS-QPSK.
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