| 1. |
- Fougstedt, Christoffer, 1990, et al.
(författare)
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ASIC Implementation of Time-Domain Digital Back Propagation for Coherent Receivers
- 2018
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 30:13, s. 1179-1182
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Tidskriftsartikel (refereegranskat)abstract
- Digital back propagation (DBP) is often proposed and implemented offline for the mitigation of nonlinear impairments in long-haul fiber communications. However, complexity in terms of chip area and power consumption in a realistic application-specific integrated circuit implementation is yet to be determined. Here, we implement time-domain DBP (TD-DBP) in a 28-nm fully-depleted silicon-on-insulator process technology, considering digital implementation aspects such as limited-resolution arithmetic and finite-length filters. We choose as example a coherent optical transmission system, viz. a single-channel, single-polarization, and 20-GBd 16-QAM system, for which the DBP is known to perform well. For the considered system, we find that the TD-DBP can enable a reach increase from 3400 to 5300 km, at a power dissipation of <20 W (or, conversely, an energy dissipation of <230 pJ/bit), at a pre-FEC BER of 10-2.
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| 2. |
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| 3. |
- Fougstedt, Christoffer, 1990, et al.
(författare)
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Time-Domain Digital Back Propagation: Algorithm and Finite-Precision Implementation Aspects
- 2017
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Ingår i: Optics InfoBase Conference Papers. - 2162-2701. - 9781943580231 ; , s. Article no 7937325-
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Konferensbidrag (refereegranskat)abstract
- We propose a nonlinear mitigation algorithm designed from an ASIC perspective, and analyze implementation aspects. Given 9 signal and 11 coefficient bits, reach is increased by 105% compared to linear compensation in single-channel 16-QAM transmission.
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| 4. |
- Lundberg, Lars, 1989, et al.
(författare)
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Power Consumption Savings Through Joint Carrier Recovery for Spectral and Spatial Superchannels
- 2018
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Ingår i: European Conference on Optical Communication, ECOC. ; 2018-September
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Konferensbidrag (refereegranskat)abstract
- The power consumption of a circuit implementation of a master-slave carrier recovery scheme is studied. Slave power consumption is 27% of master power for 16QAM and 13% for 64QAM, enabling power savings approaching 0.7W per channel through joint processing.
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| 5. |
- Börjeson, Erik, 1984, et al.
(författare)
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ASIC Design Exploration of Phase Recovery Algorithms for M-QAM Fiber-Optic Systems
- 2019
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Ingår i: Optics InfoBase Conference Papers. - 2162-2701. - 9781943580538
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Konferensbidrag (refereegranskat)abstract
- We develop circuit implementations and explore design optimizations for one blind and one pilot-based carrier phase-recovery algorithm, where the former algorithm is shown to dissipate 1.8-4.5 pJ/bit and the latter 0.5-0.3 pJ/bit, using 16 to 256QAM.
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| 6. |
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| 7. |
- Börjeson, Erik, 1984, et al.
(författare)
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VLSI Implementations of Carrier Phase Recovery Algorithms for M-QAM Fiber-Optic Systems
- 2020
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 38:14, s. 3616-3623
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Tidskriftsartikel (refereegranskat)abstract
- We present circuit implementations of blind phase search (BPS) carrier phase recovery (CPR) for M-QAM coherent optical receivers and highlight some BPS algorithm modifications necessary to obtain efficient VLSI circuits. In addition, we show how three key design parameters (input word length, number of test phases, and type and size of averaging window) affect the resulting implementation. To study design tradeoffs, we develop BPS CPR circuit netlists for a 32-GBaud system, using a 22-nm CMOS process technology: Our implementations reach energy efficiencies of around 1 pJ/bit for 16QAM up to 3 pJ/bit for 256QAM, at an SNR penalty of approximately 0.25 dB at a BER of 10^(−2). Furthermore, we present a circuit implementation of pilot-symbol-aided CPR, reaching 0.38 pJ/bit and 0.34 pJ/bit for 16QAM and 256QAM, respectively, at a slightly higher SNR penalty. The two CPR methods are also evaluated in terms of silicon area and scaling to higher-order modulation formats.
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| 8. |
- Fougstedt, Christoffer, 1990, et al.
(författare)
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ASIC Design Exploration for DSP and FEC of 400-Gbit/s Coherent Data-Center Interconnect Receivers
- 2020
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Ingår i: 2020 Optical Fiber Communications Conference and Exhibition, OFC 2020 - Proceedings. - : Optical Society of America. - 9781943580712
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Konferensbidrag (refereegranskat)abstract
- We perform exploratory ASIC design of key DSP and FEC units for 400-Gbit/s coherent data-center interconnect receivers. In 22-nm CMOS, the considered units together dissipate 5W, suggesting implementation feasibility in power-constrained form factors.
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| 9. |
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| 10. |
- Fougstedt, Christoffer, 1990, et al.
(författare)
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Dynamic Equalizer Power Dissipation Optimization
- 2016
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Ingår i: 2016 Optical Fiber Communications Conference and Exhibition. - 9781943580071
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Konferensbidrag (refereegranskat)abstract
- We investigate power dissipation/performance trade-off in a 28nm ASIC implementation of a parallel dynamic equalizer. Over 50% dissipation improvement is possible by sample pruning during filter updates, with only minor tracking-performance reduction.
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