100G and beyond with digital coherent signal processing

Roberts, Kim; Beckett, D. J. S.; Boertjes, David; Berthold, J.; Laperle, Charles

doi:10.1109/mcom.2010.5496879

Cited by 107 publications

(26 citation statements)

References 9 publications

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“…Another commercially available 100Gb/s transponder applies two narrow spaced (20GHz) optical carries each modulated with PM-QPSK formats based on 14 Gbaud modulation [41], [16]. The hardware implementation features of transmitter and receiver of this modulation technique is given in Table-10.…”

Section: Polarization Mode Ofdm-qpsk/ Differential Phase -Ofdm-qpskmentioning

confidence: 99%

Performance Analysis and Monitoring of Various Advanced Digital Modulation and Multiplexing Techniques of F.O.C Within and Beyond 400 Gb/S

Mohapatra¹,

Choudhury²,

Bhojray³

et al. 2014

IJCNC

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Section: Polarization Mode Ofdm-qpsk/ Differential Phase -Ofdm-qpskmentioning

confidence: 99%

Performance Analysis and Monitoring of Various Advanced Digital Modulation and Multiplexing Techniques of F.O.C Within and Beyond 400 Gb/S

Mohapatra¹,

Choudhury²,

Bhojray³

et al. 2014

IJCNC

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“…[13][14][15] Though there have been a lot of research on the electrical channel equalizers based on simulation or off-line experiments, [16][17][18] the real-time implementation of such digital equalizers for 100 Gb∕s and above rate is difficult due to the bottleneck of the hardware processing speed not available from current chip technology. 19 The computation delay on the error signal feedback from the parallel and pipelined implementation was found to have detrimental effects on the convergence performance of the adaptive TDE. [20][21][22] This paper focuses on the effects of the feedback delay on the TDE's convergence speed and performance.…”

Section: Introductionmentioning

confidence: 99%

Studies on effects of feedback delay on the convergence performance of adaptive time-domain equalizers for fiber dispersive channels

Guo

Qiu

2016

Opt. Eng

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Abstract. Adaptive time-domain equalizer (TDE) is an important module for digital optical coherent receivers. From an implementation perspective, we analyze and compare in detail the effects of error signal feedback delay on the convergence performance of TDE using either least-mean square (LMS) or constant modulus algorithm (CMA). For this purpose, a simplified theoretical model is proposed based on which iterative equations on the mean value and the variance of the tap coefficient are derived with or without error signal feedback delay for both LMS-and CMA-based methods for the first time. The analytical results show that decreased step size has to be used for TDE to converge and a slower convergence speed cannot be avoided as the feedback delay increases. Compared with the data-aided LMS-based method, the CMA-based method has a slower convergence speed and larger variation after convergence. Similar results are confirmed using numerical simulations for fiber dispersive channels. As the step size increases, a feedback delay of 20 clock cycles might cause the TDE to diverge. Compared with the CMA-based method, the LMS-based method has a higher tolerance on the feedback delay and allows a larger step size for a faster convergence speed.

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“…OHERENT detection, advanced modulation formats, and multi-carrier signaling (OFDM and Nyquist-WDM) are widely studied in optical transmission systems [1] [2]. As these technologies mature, they are expected to trickle down to metro and access networks [3].…”

Section: Introductionmentioning

confidence: 99%

Semiconductor Optical Amplifier-Based Wavelength Conversion of Nyquist-16QAM for Flex-Grid Optical Networks

Filion¹,

Jiachuan²,

Nguyen

et al. 2016

J. Lightwave Technol.

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Abstract-We experimentally demonstrate semiconductor optical amplifier (SOA) based wavelength conversion of 3×25 Gbaud Nyquist-16QAM signal for a flex-grid network. The conversion efficiency and power penalty of each of three channels during single pumped SOA wavelength conversion are studied with respect to three different channel spacings (or frequency grids). The BER performance of all converted channels fall below the FEC threshold of 3.8e-3, even with a 50 GHz grid. The results show the tradeoff between channel spacing, conversion efficiency and BER power penalty. Closely packed channels, which clearly increase spectral efficiency, are also shown to decrease conversion power penalty, potentially counter balancing increased crosstalk levels. These results can be used to optimize routing and spectrum allocation strategy when SOA wavelength converter(s) are present in the optical link.

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100G and beyond with digital coherent signal processing

Cited by 107 publications

References 9 publications

Performance Analysis and Monitoring of Various Advanced Digital Modulation and Multiplexing Techniques of F.O.C Within and Beyond 400 Gb/S

Performance Analysis and Monitoring of Various Advanced Digital Modulation and Multiplexing Techniques of F.O.C Within and Beyond 400 Gb/S

Studies on effects of feedback delay on the convergence performance of adaptive time-domain equalizers for fiber dispersive channels

Semiconductor Optical Amplifier-Based Wavelength Conversion of Nyquist-16QAM for Flex-Grid Optical Networks

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