Towards 1.6T datacentre interconnect technologies: the TWILIGHT perspective

Spyropoulou, M.; Kanakis, Giannis; Jiao, Yuqing; Calabretta, Nicola; Williams, Kevin; Dupuy, Jean-Yves; Konczykowska, A.; Schatz, Richard; Ozoliņš, Oskars; Zve{ě}řina, Jakub; Zoldak, Martin; Bakopoulos, Paraskevas; Patronas, Giannis; Avramopoulos, H.

doi:10.1088/2515-7647/ab9bf6

Cited by 4 publications

(2 citation statements)

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“…High-speed digital/analog to analog/digital converter (DAC/ADC) [8], and broadband optoelectronic components including the direct-/electro absorption-modulated lasers (DML/EML) and silicon photonics (SiP)-based modulators [9] are being reported. With advanced components and DSP, several IM/DD system demonstrations of beyond 200 Gbps lane rate have been reported [10][11][12][13][14].…”

Section: Technological Choices and Research Statusmentioning

confidence: 99%

Short Reach Communication Technologies for Client-Side Optics Beyond 400 Gbps

Pang

Udaļcovs

Schatz

et al. 2021

IEEE Photon. Technol. Lett.

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Short reach optical communication technologies are increasingly demanded in several fast-evolving application scenarios in both telecom and datacom. Low-cost and lowcomplexity intensity modulation and direct detection (IM/DD) technologies are challenged to scale up the link rate beyond 400 Gbps by increasing the single-lane rate towards 200 Gbps, to maintain a low lane count in client-side optics. Limited by the bandwidth of both electronics and optoelectronics, and the more pronounced chromatic dispersion in the fiber, such high baud rate systems require the use of digital signal processing techniques with forward error correction (FEC) coding. Therefore, in this work, we first summarize a few potential alternative technologies to the IM/DD for future development and then focus on extending the IM/DD systems towards 200 Gbps lane rate. We study both their capability and their performance limits using numerical simulations and transmission experiments.

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Section: Technological Choices and Research Statusmentioning

confidence: 99%

Short Reach Communication Technologies for Client-Side Optics Beyond 400 Gbps

Pang

Udaļcovs

Schatz

et al. 2021

IEEE Photon. Technol. Lett.

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“…However, we need to take into consideration the implementational complexity. Advanced modulation formats are also being extensively investigated to scale up the speed, even up to 1.6 TbE [37,38]. To gradually achieve this goal, we need to increase the baud rate of individual lanes even higher.…”

Section: Introductionmentioning

confidence: 99%

100 Gbaud On–Off Keying/Pulse Amplitude Modulation Links in C-Band for Short-Reach Optical Interconnects

et al. 2021

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We experimentally evaluate the high-speed on–off keying (OOK) and four-level pulse amplitude modulation (PAM4) transmitter’s performance in C-band for short-reach optical interconnects. We demonstrate up to 100 Gbaud OOK and PAM4 transmission over a 400 m standard single-mode fiber with a monolithically integrated externally modulated laser (EML) having 100 GHz 3 dB bandwidth with 2 dB ripple. We evaluate its capabilities to enable 800 GbE client-side links based on eight, and even four, optical lanes for optical interconnect applications. We study the equalizer’s complexity when increasing the baud rate of PAM4 signals. Furthermore, we extend our work with numerical simulations showing the required received optical power (ROP) for a certain bit error rate (BER) for the different combinations of the effective number of bits (ENOB) and extinction ratio (ER) at the transmitter. We also show a possibility to achieve around 1 km dispersion uncompensated transmission with a simple decision feedback equalizer (DFE) for a 100 Gbaud OOK, PAM4, and eight-level PAM (PAM8) link having the received power penalty of around 1 dB.

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