Generation of a Digitally Shaped 55-GBd 64-QAM Single-Carrier Signal Using Novel High-Speed DACs

Randel, Sebastian; Corteselli, Stephen; Winzer, Peter J.; Adamiecki, A.; Gnauck, A.H.; Chandrasekhar, S.; Bielik, Anna; Altenhain, Lars; Ellermeyer, T.; Dumler, Ulrich; Langenhagen, H.; Schmid, Rolf

doi:10.1364/ofc.2014.m2a.3

Cited by 16 publications

(5 citation statements)

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“…They have high sampling rates but limited analog bandwidth of less than about 20 GHz. To overcome this analog bandwidth limitation of CMOS-based technology, InP-or SiGe-HBT-based converters have also been investigated [16,18,20, 24] for 1-Tb/s-class systems. In addition, InP-or SiGe-based ultra-broadband track-and-hold amplifiers (THAs) [25,26] and analog multiplexers (AMUXs) [27] have attracted attention for their ability to enhance the analog bandwidth of CMOS-based data converters as a more practical approach for digital coherent transceivers.…”

Section: Data Converters: Dac and Adcmentioning

confidence: 99%

High-performance compound-semiconductor integrated circuits for advanced digital coherent optical communications systems

Nagatani

Nosaka

2016

IEICE Electron. Express

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Communications traffic over photonic networks is exponentially increasing due to the spread of broadband applications. To cope with the rapid growth, novel 100-Gb/s digital coherent systems have been deployed recently in optical core networks. Further research and development of digital coherent technologies with channel rates of beyond 100 Gb/s is now being conducted. Optical transceivers for such high-speed communications systems need high-performance analog and mixed-signal electronic circuits such as optical modulator drivers, transimpedance amplifiers (TIAs), analog-to-digital converters (ADCs), and digital-to-analog converters (DACs). Compound-semiconductor integrated circuits (ICs) have played key roles in this technical field. This paper reviews recent trends in compound-semiconductor ICs for such advanced digital coherent optical communications systems and presents our latest results based on InP heterojunction bipolar transistor (HBT) technology.

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Section: Data Converters: Dac and Adcmentioning

confidence: 99%

High-performance compound-semiconductor integrated circuits for advanced digital coherent optical communications systems

Nagatani

Nosaka

2016

IEICE Electron. Express

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“…Referring to the MMT data recovery concept, one may argue that the complexity of MMT receiver is higher than M-PAM system. However, the complexity is due to additional sampling circuit, the solution of which is available in term of technology and experts [17], [18]. Work on technologies aspect for 40 Gb/s integrated circuit (IC) has now reached the stage where cost-effective commercial products are being developed.…”

Section: Other Aspectsmentioning

confidence: 99%

Power Efficiency Evaluation of Mapping Multiplexing Technique and Pulse Amplitude Modulation for Noncoherent Systems

Elsherif

Malekmohammadi

2015

IEEE Photonics J.

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The two-, three-, and four-channel mapping multiplexing technique (MMT) is demonstrated to increase the data capacity of multilevel intensity-modulated transmission formats to 2, 3, and 4 bits/symbol with a substantial reduction in power penalty. This paper outlines the N-channel MMT design metric consideration influence on the performance enhancement of higher order amplitude modulated systems in terms of power penalty, receiver sensitivity, and spectral efficiency. The signal space model has been developed for N-channel MMT, where the average electrical and optical power expressions are derived. Transmission of 2, 3, and 4 bits/symbol using MMT system shows better performance in terms of the average optical power penalty, in comparison with pulse amplitude modulation (M-PAM) formats, with respect to the information capacity. The proposed scheme can be considered as an alternative to M-PAM systems with enhanced power efficiency.

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“…High competition presently exits between CMOS based and SiGe based DAC in terms of sampling rate, analog bandwidth, and number of bits resolution. Recently MICRAM Instruments reported SiGe based DAC with sampling rate of 72 GSa/s and analog bandwidth of 23 GHz but has only 6 bit of resolution . Table summarizes the main features for both technologies.…”

Section: Introductionmentioning

confidence: 99%

Investigation of sampling frequency impact on optical DP‐MQAM generation

Ragheb

Fathallah

2016

Micro & Optical Tech Letters

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The complementary integration of high spectrally efficient modulation formats, coherent receivers, and advanced electronic subsystems, has resulted in a revolution in the spectral efficiency of optical communications. This letter experimentally investigates the impact of varying the characteristics of high speed CMOS‐DAC on the performance of optical DP‐MQAM systems. We particularly consider two operating conditions, referred as over‐ and under‐sampling. In the former case, we relax the CMOS circuit; however limit the maximum transmitted baud rate (i.e., 32 GBd for 64 GSa/s). In the second regime, we stress the DAC in order to generate less than two samples for each symbol, hence increase the transmitted baud rate at the expense of higher signal bandwidth. Under the first regime, our experimental results show a measured EVM and BER of 4.7%rms and 5 × 10−2, respectively, for DP‐128QAM/32GBd. In the second regime, we obtain a variable baud rate ranging from 36 up to 56 GBd using a sampling ratio starting from 1.8 and decreasing down to 1.14, respectively, with maximum modulation order of QPSK at 56 GBd. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1128–1131, 2016

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Generation of a Digitally Shaped 55-GBd 64-QAM Single-Carrier Signal Using Novel High-Speed DACs

Cited by 16 publications

References 1 publication

High-performance compound-semiconductor integrated circuits for advanced digital coherent optical communications systems

High-performance compound-semiconductor integrated circuits for advanced digital coherent optical communications systems

Power Efficiency Evaluation of Mapping Multiplexing Technique and Pulse Amplitude Modulation for Noncoherent Systems

Investigation of sampling frequency impact on optical DP‐MQAM generation

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