180-GBaud All-ETDM Single-Carrier Polarization Multiplexed QPSK Transmission over 4480 km

Raybon, G.; Adamiecki, A.; Cho, J.; Jorge, F.; Konczykowska, A.; Riet, M.; Duval, B.; Dupuy, J.-Y.; Fontaine, Nicolas K.; Winzer, Peter J.; Chandrasekhar, S.; Chen, X.

doi:10.1364/ofc.2018.th4c.3

Cited by 26 publications

(14 citation statements)

References 3 publications

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“…This technology is now expected to penetrate into the rapidly growing, capacityhungry short reach links, such as metro and data-centre interconnects, where an in-phase/quadrature (IQ) modulator must be operated in a small space, while featuring low loss, low drive voltages, and large bandwidths [8][9][10] . For nearly a decade, IQ modulators based on low-index-contrast lithium niobate (LiNbO 3 , LN) waveguides have been the mainstay for generating the advanced modulation formats [11][12][13][14] . Although these modulators have enjoyed tremendous success in long-haul coherent networks, their performance is already reaching a limit because the low-index-contrast LN waveguides cannot support them.…”

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confidence: 99%

High-performance coherent optical modulators based on thin-film lithium niobate platform

Zhang³

et al. 2020

Nat Commun

368

152

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The coherent transmission technology using digital signal processing and advanced modulation formats, is bringing networks closer to the theoretical capacity limit of optical fibres, the Shannon limit. The in-phase/quadrature electro-optic modulator that encodes information on both the amplitude and the phase of light, is one of the underpinning devices for the coherent transmission technology. Ideally, such modulator should feature a low loss, low drive voltage, large bandwidth, low chirp and compact footprint. However, these requirements have been only met on separate occasions. Here, we demonstrate integrated thin-film lithium niobate in-phase/quadrature modulators that fulfil these requirements simultaneously. The presented devices exhibit greatly improved overall performance (half-wave voltage, bandwidth and optical loss) over traditional lithium niobate counterparts, and support modulation data rate up to 320 Gbit s −1. Our devices pave new routes for future highspeed, energy-efficient, and cost-effective communication networks.

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confidence: 99%

High-performance coherent optical modulators based on thin-film lithium niobate platform

Zhang³

et al. 2020

Nat Commun

368

152

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“…To meet the needs for higher baud rate, two kinds of structures are commonly used: 4:1 MUX and 2:1 MUX, based on silicon germanium (SiGe) and indium phosphide (InP) technologies [27]. By adopting the packaged 2:1 InP double heterojunction bipolar transistor (InP-DHBT) selectors, the all-ETDM record-high 180 GBd PDM-QPSK was successfully generated and transmitted over 4480-km standard single mode fiber [28].…”

Section: A Electronic Time-division Multiplexingmentioning

confidence: 99%

Enabling Technology in High-Baud-Rate Coherent Optical Communication Systems

Huang

Pan

et al. 2020

IEEE Access

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High-baud-rate coherent optical system is essential to support the ever-increasing demand for high-speed applications. Owing to the recent progress in advanced modulation formats, over 1 Tb/s single-carrier data transmission has been achieved in the laboratory, and its commercial application is envisioned in the near future. This paper presented the trend of increasing baud rate and utilizing high-order quadrature-amplitude modulation (QAM), and several enabling technologies in the coherent optical communication systems. We first discussed recent progress of high-order QAM system and digital signal processing technology. Furthermore, we compared the transmission performance of three different ultrahigh-order QAM formats. The paper then reviewed the commonly used methods of achieving over 100 GBaud optically modulated signals. Besides, five attractive modulators and their corresponding modulation structures are illustrated. Key performance parameters including electrode length, 3-dB bandwidth, half-wave voltage, extinction ratio and optical loss are also compared. Finally, the trade-off between the baud rate and QAM orders in implementing high-speed systems are investigated in simulations. The results show that for the coming 800 GbE or 1.6 TbE, PDM-64-QAM might be an idea choice by considering the trade-off between the link reach and required system bandwidth. By adopting the latest probabilistic shaping technology, higher-order QAM signals, such as PS PDM-256-QAM, could be favorable for long reach applications while using extra system bandwidth. INDEX TERMS Coherent optical communications, high baud rate, QAM, electro-optic modulators.

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“…Superchannels constructed by combining several densely-spaced wavelength carriers are required to reach target line rates approaching 1-10 Tb/s, needed to support next generation router interfaces [74]. Even looking beyond state-of-the-art electrical and optical hardware supporting bandwidths up to and beyond 100 GHz enabling demonstrations of 180-Gbaud quadrature phase-shift-keying (QPSK) transmission [76], the required electrical bandwidth is significantly beyond what can be achieved using a single wavelength carrier. Considering state-of-the-art integrated transceivers capable of transmitting symbol rates up to 100 Gbaud [77] and assuming that such a transceiver could reach the current record WDM spectral-efficiency of 14.2 bits/4D-symbol reported in [78], about seven transceivers are still required to reach the 10-Tb/s line rate.…”

Section: Comb-based Superchannelsmentioning

confidence: 99%

Frequency Comb-Based WDM Transmission Systems Enabling Joint Signal Processing

et al. 2018

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We review the use of optical frequency combs in wavelength-division multiplexed (WDM) fiber optic communication systems. In particular, we focus on the unique possibilities that are opened up by the stability of the comb-line spacing and the phase coherence between the lines. We give an overview of different techniques for the generation of optical frequency combs and review their use in WDM systems. We discuss the benefits of the stable line spacing of frequency combs for creating densely-packed optical superchannels with high spectral efficiency. Additionally, we discuss practical considerations when implementing frequency-comb-based transmitters. Furthermore, we describe several techniques for comb-based superchannel receivers that enables the phase coherence between the lines to be used to simplify or increase the performance of the digital carrier recovery. The first set of receiver techniques is based on comb-regeneration from optical pilot tones, enabling low-overhead self-homodyne detection. The second set of techniques takes advantage of the phase coherence by sharing phase information between the channels through joint digital signal processing (DSP) schemes. This enables a lower DSP complexity or a higher phase-noise tolerance.

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180-GBaud All-ETDM Single-Carrier Polarization Multiplexed QPSK Transmission over 4480 km

Cited by 26 publications

References 3 publications

High-performance coherent optical modulators based on thin-film lithium niobate platform

High-performance coherent optical modulators based on thin-film lithium niobate platform

Enabling Technology in High-Baud-Rate Coherent Optical Communication Systems

Frequency Comb-Based WDM Transmission Systems Enabling Joint Signal Processing

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