Multi-band DFT-S 100 Gb/s 32 QAM-DMT transmission in intra-DCI using 10 G-class EML and low-resolution DAC

Yin, Mingzhu; Wang, Wei; Zou, Dongdong; Luo, Zhibin; Shu, Qi; Yi, Xingwen; Li, Fan; Li, Zhaohui

doi:10.1364/oe.462952

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…[11][12][13] NS can effectively overcome the obstacles of high oversampling rate in DSM and computational complexity of DRE, making it more feasible to use cheap DACs with low resolutions for the purpose of simplifying the coherent optical systems. 14,15 In this work, we for the first time apply the non-integer-oversampling clock data recovery (CDR) to process the noise-shaped coherent optical signals. NS technique can mitigate the quantization noise (within the signal spectrum) by using cheap DACs with low bit resolutions.…”

Section: Introductionmentioning

confidence: 99%

Simplified coherent optical transmissions utilizing noise shaping and non-integer-oversampling clock data recovery

Mu,

Sun,

Yin

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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To meet the ever-increasing demand for data traffic, the simplified coherent optical communications, which exhibit the advantages of low cost, low power consumption and high capacity, have garnered the widespread attention for short-reach optical communications applications. To further reduce the cost of coherent optical transmissions, we for the first time propose and demonstrate the capability of non-integer-oversampling clock data recovery (CDR) to process the noise-shaped signals which is robust to the quantization noise when using cheap digital-to-analog converters (DACs). The 192-Gbps dual-polarization quadrature amplitude modulation-16 (DP-QAM-16) transmissions are experimentally realized by jointly implementing the noise shaping (NS) technique and 4/3 samples per symbol (sps) CDR processing. Experimental results indicate that 1.2-and 1-dB Q factor gains have been achieved by using the proposed simplified coherent optical transmission structure, under the constraints of 3-and 4-bit quantization respectively. We believe that the joint implementation of NS and non-integer-oversampling CDR is promising for simplifying the coherent optical transmissions for low-cost optical communications applications.

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Section: Introductionmentioning

confidence: 99%

Simplified coherent optical transmissions utilizing noise shaping and non-integer-oversampling clock data recovery

Mu,

Sun,

Yin

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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show abstract

“…The ever-increasing data bandwidth demand of actual data traffic has triggered a growing interest in the development of high throughput datacenter interconnections (DCI). The main objective in developing next generation DCI is to reach 100 Gb/s making use of components developed and deployed for 10G [2] to reduce costs thanks to the use of mature 10G low-cost optical solutions. To achieve high data rates with a restricted bandwidth the available strategies are: to improve the spectral efficiency (as in long haul optical links) and to multiplex.…”

mentioning

confidence: 99%

“…Moreover, to keep deployment costs low, optical coherent transmission is not foreseeable in the near future, so optical transmission will make use of IM/DD schemes. Therefore, this improvement in spectral efficiency will require the use of powerful digital signal processing solutions [3] and efficient modulation formats such as OFDM [2], [4], [5], [6] and SCM [7], [8], [9], [10]. This last one is the strategy developed in this paper.…”

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confidence: 99%

Hardware Architecture of a QAM Receiver for Short-Range Optical Communications

Valls

Torres

Perez-Pascual

et al. 2023

J. Lightwave Technol.

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Short-reach optical fiber communications systems aim to achieve high throughput, in the order of tens of Gbps.The implementation of these high-speed systems requires parallel processing, which makes low-complexity designs of their subsystems a key to the successful large-scale deployment of this technology. Half-Cycle Nyquist Subcarrier Modulation (HC-SCM) was originally suggested for these systems with the goal of using as much bandwidth as possible and, therefore, achieving high communication rates. Recently, Oversampled Subcarrier Modulation (OVS-SCM) was proposed as an alternative more computational efficient than HC-SCM and also with a better spectral efficiency. This paper proposes a hardware-efficient architecture for an OVS-SCM receiver, which takes into account the inherent parallel processing of these systems. This receiver takes 16 samples in parallel from a 5 GSa/s analogto-digital converter with a 3.2 GHz 3 dB bandwidth. Design solutions for the frame detection block, the mixer, the resampler, the fractional interpolator, the matched filter and the timing estimator are presented. Our results show that, compared to the HC-SCM receiver, this proposal reduces the computational load of the downconverter stages by 90%. FPGA implementation results are given to demonstrate that our proposal can be implemented in state-of-the-art devices. Index Termsshort-range optical links, FPGA, hardware architecture, receiver I. INTRODUCTION Short-reach optical fiber systems with intensity modulated direct-detection (IM/DD) transmission scheme over standard single-mode fiber (SSMF) is a potential solution to support the continuous increase in data traffic of telecommunications networks. There are three possible solutions to increase the bit rate in any communications system: to make use of more bandwidth, to increase the spectral efficiency by means of modulation formats with more bits per symbol, and to multiplex several data signals. In recent years the move from 10G to 100G in optical links has made use of a mixture of the previously stated solutions. For example, from 10G to 40G multiplexing was the chosen solution by means of four 10G links, whether transmitted using four different wavelengths, or using four different fibers. The road to 100G has been solved with different solutions, each one using a different combination of Manuscript received XX, XX; revised XX, XX. Grants RTI2018-101658-B100 and PID2021-126514OB-I00 funded by

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Pre-Equalized DMT Signal Transmission Utilizing Low-Resolution DAC With Channel Response Dependent Noise Shaping Technique

Yin

Wang

et al. 2023

J. Lightwave Technol.

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Multi-band DFT-S 100 Gb/s 32 QAM-DMT transmission in intra-DCI using 10 G-class EML and low-resolution DAC

Cited by 6 publications

References 18 publications

Simplified coherent optical transmissions utilizing noise shaping and non-integer-oversampling clock data recovery

Simplified coherent optical transmissions utilizing noise shaping and non-integer-oversampling clock data recovery

Hardware Architecture of a QAM Receiver for Short-Range Optical Communications

Pre-Equalized DMT Signal Transmission Utilizing Low-Resolution DAC With Channel Response Dependent Noise Shaping Technique

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