Real-time DSP for 100+ Gb/s

Pan, Yuming; Aydinlik, M.; Crowley, Martin; Geyer, J. C.; Humblet, P.A.; Liu, F.; Mikkelsen, B.; Monsen, P.; Nadarajah, N.; Pendock, G.J.; Shah, B.

doi:10.1364/ofc.2013.ow1e.1

Cited by 15 publications

(5 citation statements)

References 4 publications

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“…High-order modulation formats at high symbol rates combined with coherent detection are of particular interest due to their ability to meet the growing demands for higher bit rates while still reducing the cost per bit. The constant development in electronics enabled state-of-the-art transceivers to evolve from legacy intensitymodulation and direct-detection schemes to a combination of multilevel modulation formats and coherent detection employing digital signal processing (DSP) [2]- [4].…”

Section: Introductionmentioning

confidence: 99%

Optimization of DP-M-QAM Transmitter Using Cooperative Coevolutionary Genetic Algorithm

Diniz

Ros

Silva

et al. 2018

J. Lightwave Technol.

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Section: Introductionmentioning

confidence: 99%

Optimization of DP-M-QAM Transmitter Using Cooperative Coevolutionary Genetic Algorithm

Diniz

Ros

Silva

et al. 2018

J. Lightwave Technol.

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“…While sampling rates are adequate for negligible performance penalties (∼1.2 × baud rate with digital pulse shaping) [18], the low pass response and limited DAC resolution induce severe inter-symbol interference [19]- [20]. This is the key reason why maximum baud rates with integrated commercial DACs are still limited to around 30 Gbaud [2], [21], [22]. In order to enable higher baud rate transmission systems, allowing for higher forward error correction (FEC) overhead and/or saving on transponder count, DAC limitations need to be addressed.…”

Section: Introductionmentioning

confidence: 99%

Digital Pre-Emphasis in Optical Communication Systems: On the Nonlinear Performance

Rafique

Rahman

Napoli

et al. 2015

J. Lightwave Technol.

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Digital signal pre-processing at the transmitter is a key enabler for next-generation optical transceivers. One of the major challenges faced by these transponders is the limited resolution and −3 dB electrical bandwidth of the digital-to-analog converters (DAC), severely limiting the transmission performance. On the other hand, these spectrally efficient flexible transport networks are extremely sensitive to nonlinear channel impairments, essentially limiting the maximum system reach. In this paper, we employ a simple digital pre-emphasis (DPE) algorithm to mitigate DAC-induced signal distortions, and further report on the impact of DPE algorithm on nonlinear transmission performance. We demonstrate, both numerically and experimentally, that DPE not only counteracts DAC low-pass response, allowing for higher baud rate transmission, but also enables better nonlinear channel tolerance. In particular, we first establish the maximum transmittable baud rates in back-to-back configuration for polarization multiplexed m-state quadrature amplitude modulation (PM-mQAM) formats, allowing up to 50, 46 and 44 Gbaud transmission for PM-4QAM, PM-8QAM, and PM-16QAM, respectively assuming typical DAC specifications of 16 GHz −3 dB bandwidth and 5.5 effective number of bits. Furthermore, we show that the performance improvements from DPE increase with increasing modulation order and decreasing span count, with maximum improvements of up to ∼2.2 dB. In a conventional standard single mode fiber transmission link with lumped amplification, employing DPE, we report maximum reach of up to ∼10 000, ∼5000, and ∼3000 km, for PM-4QAM, PM-8QAM, and PM-16QAM, respectively. Moreover, at pre-FEC bit-error-rate, relative reach improvements from DPE are found to be up to 21%, 25%, and 27%, respectively. Finally, we show that DPE gains are constant beyond a minimum required channel spacing, with minimum spacing requirements of 1.1 × baud rate, 1.15 × baud rate, and 1.2 × baud rate for PM-4QAM→PM-16QAM, respectively.

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“…SD low-density parity check (LDPC)-based coding is currently one such basic solution [2], [3]. Coherent detection using digital signal processing (DSP) has become practical in real-life optical communication systems [4]- [6]. The OSNR tolerance has been improved by using coherent detection instead of direct or differential detection.…”

Section: Introductionmentioning

confidence: 99%

Cycle Slip Compensation with Polarization Block Coding for Coherent Optical Transmission: Two-dimensional phases constellation corresponds to a slip state

Yoshida

Sugihara

Ishida

et al. 2014

IEEE Signal Process. Mag.

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Real-time DSP for 100+ Gb/s

Cited by 15 publications

References 4 publications

Optimization of DP-M-QAM Transmitter Using Cooperative Coevolutionary Genetic Algorithm

Optimization of DP-M-QAM Transmitter Using Cooperative Coevolutionary Genetic Algorithm

Digital Pre-Emphasis in Optical Communication Systems: On the Nonlinear Performance

Cycle Slip Compensation with Polarization Block Coding for Coherent Optical Transmission: Two-dimensional phases constellation corresponds to a slip state

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