| 1. |
- Fougstedt, Christoffer, 1990, et al.
(author)
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ASIC Implementation of Time-Domain Digital Back Propagation for Coherent Receivers
- 2018
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In: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 30:13, s. 1179-1182
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Journal article (peer-reviewed)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.
(author)
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Time-Domain Digital Back Propagation: Algorithm and Finite-Precision Implementation Aspects
- 2017
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In: Optics InfoBase Conference Papers. - 2162-2701. - 9781943580231 ; , s. Article no 7937325-
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Conference paper (peer-reviewed)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.
(author)
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Power Consumption of a Minimal-DSP Coherent Link with a Polarization Multiplexed Pilot-Tone
- 2016
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In: 42nd European Conference and Exhibition on Optical Communications, September 18-22, 2016, Düsseldorf. - 9783800742745
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Conference paper (peer-reviewed)abstract
- We experimentally study the trade-off between performance and DSP power consumption. While minimal DSP allows transmission of 16QAM at 5 GBaud, the symbol rate can be increased if anextra equalizer is added, leading to energy savings in optical components.
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| 5. |
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| 6. |
- Sheikh, Alireza, 1989, et al.
(author)
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Dispersion Compensation Filter Design Optimized for Robustness and Power Efficiency
- 2015
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In: Signal Processing in Photonics Communications, SPPCom 2015; Boston, MA; United States; 27 June 2015 through 1 July 2015. - 9781557520005 ; , s. SpT3D.2-
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Conference paper (peer-reviewed)abstract
- We present an optimized CD compensation filter with improved performance and increased resilience to quantization errors. The filter is given in closed form based on a constrained least-squares problem.
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| 7. |
- Sheikh, Alireza, 1989, et al.
(author)
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Dispersion Compensation FIR Filter with Improved Robustness to Coefficient Quantization Errors
- 2016
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In: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 34:22, s. 5110-5117
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Journal article (peer-reviewed)abstract
- In this paper, we propose a new finite impulseresponse (FIR) filter for chromatic dispersion compensation which is given in closed form. We identify a relation between the out-of-band gain and the in-band error when the filter is implemented with finite-precision arithmetic. In particular, a large out-of-band gain makes the filter more sensitive tocoefficient quantization errors due to finite precision digital signal processing. To improve robustness to coefficient quantization errors, our proposed filter is designed based on confining the out-of-band gain. By means of simulations, we show that our filter outperforms other existing FIR filters. The performance gain improves with increasing modulation order and decreasing number of bits used to represent the filter taps.
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| 8. |
- Szczerba, Krzysztof, 1985, et al.
(author)
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Impact of Forward Error Correction on Energy Consumption of VCSEL-based Transmitters
- 2015
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In: 41st European Conference on Optical Communication, ECOC 2015, Valencia, Spain, 27 September - 1 October 2015. - 9788460817413
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Conference paper (peer-reviewed)abstract
- We present an analysis of the effect of FEC on energy consumption of VCSEL based transmitters for short-range optical links. We show that a low-complexity FEC can reduce the overall energy consumption of the transmitter.
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