239.3-Gbit/s net rate PAM-4 transmission using directly modulated membrane lasers on high-thermal-conductivity SiC

Yamaoka, Suguru; Diamantopoulos, Nikolaos-Panteleimon; Nishi, Hidetaka; Fujü, T.; Takeda, Koji; Hiraki, Tatsurou; Kanazawa, Shigeru; Tanobe, Hiromasa; Kakitsuka, Takaaki; Tsuchizawa, Tai; Koyama, F.; Matsuo, Shinji

doi:10.1049/cp.2019.1022

Cited by 25 publications

(25 citation statements)

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“…Improved metallization in QD lasers is necessary to minimize joule heating effect and improve energy efficiency, and integrated thermal shunt structure will add another layer of positive thermal management to make it more robust. QD intrinsic material property-determined poor direct modulation bandwidth is hard to overcome, but higher-speed MOS capacitor modulation showing 15 GHz bandwidth in the same 50 μm diameter design [26] and photon-photon resonance [101], [10] are being explored to be efficient alternative solutions to reach 25 Gb/s target. New CMOS driver chips fabricated at 28 nm node were just arrived from the foundry during manuscript preparation.…”

Section: Discussionmentioning

confidence: 99%

“…For more information, see http://creativecommons.org/licenses/by/4.0/ relieving many optical link design constrains. Compared with other bandwidth-scaling approaches like coherent communications [9] or ultra-high speed amplitude modulations [10], [11], DWDM approach along with on-off-key (OOK) modulation at medium data rate per channel, e.g., 10-25 Gb/s, can lead to an overall optimal solution for little latency, energy efficient photonics and driving electronics [12], and possibility to enable a high-radix switch architecture to minimize hops between computing nodes [13].…”

Section: Introductionmentioning

confidence: 99%

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Fully-Integrated Heterogeneous DML Transmitters for High-Performance Computing

Liang

Roshan-Zamir

Fan

et al. 2020

J. Lightwave Technol.

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Optical connectivity, which has been widely deployed in today's datacenters and high-performance computing (HPC) systems, is a disruptive technological revolution to the IT industry in the new Millennium. In our journey to debut an Exascale supercomputer, a completely new computing concept, called memorydriven computing, was innovated recently. This new computing architecture brings challenges and opportunities for novel optical interconnect solutions. Here, we first discuss our strategy to develop appropriate optical link solutions for different data traffic scenarios in memory-driven HPCs. Then, we present detailed review on recent work to demonstrate fully photonics-electronicsintegrated single-and multi-wavelength directly modulated laser (DML) transmitters on silicon for the first time. Compact heterogeneous microring lasers and laser arrays were fabricated as photonic engines to work with a customized complementary metal-oxide semiconductor (CMOS) driver circuit. Microring lasers based on conventional quantum well and new quantum dot lasing medium were compared in the experiment. Thermal shunt and MOS capacitor structures were integrated into the lasers for effective thermal management and ultra low-energy tuning. It enables a

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fully-Integrated Heterogeneous DML Transmitters for High-Performance Computing

Liang

Roshan-Zamir

Fan

et al. 2020

J. Lightwave Technol.

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“…The DML was fabricated using our membrane-III-V-on-SiC technology [6] and had a similar cavity design to the one in [5]. As a first step, a thin III-V membrane composed of InGaAlAs multi-quantum wells (MQWs) was directly-bonded to a SiC substrate through a SiO2 buffer layer.…”

Section: A Membrane Iii-v-on-sic Passive-feedback Lasermentioning

confidence: 99%

“…cost-per-bit, power consumption, and device footprints. In particular, IM/DD systems that utilize wide-bandwidth directly-modulated lasers (DMLs) [2][3][4][5] are arguably the most energy-efficient approach, which could pose such lasers among the leading technologies to support ICT growth in the future.…”

Section: Introductionmentioning

confidence: 99%

“…Recently we demonstrated the first-ever DMLs capable of achieving modulation bandwidths in excess of 100 GHz [5], which allowed us to reach 256-Gbps (net ~240-Gbps) 4-level pulse amplitude modulation (PAM-4) transmissions [5]. This unprecedented performance was owned to our novel membrane-III-V-on-SiC technology [6] and a photon-photon resonance (PPR)-supporting compound-cavity design.…”

Section: Introductionmentioning

confidence: 99%

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>100-GHz Bandwidth Directly-Modulated Lasers and Adaptive Entropy Loading for Energy-Efficient >300-Gbps/λ IM/DD Systems

Diamantopoulos

Yamazaki

Yamaoka

et al. 2021

J. Lightwave Technol.

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We demonstrate DML-based net 325-Gb/s at backto-back and 321.24-Gb/s after 2-km standard single-mode fiber transmissions for >300-Gbps/λ short-reach optical interconnects. Our net rate performance denotes an increase of ~34 % compared to our previous works, while the pre-FEC rates are >400 Gbps. The DML transmitter is based on a PPR-enhanced, >100-GHzbandwidth DML, fabricated by our novel membrane-III-V-on-SiC technology. Also wide-band, entropy-loaded DMT modulation is utilized based on a novel adaptive algorithm and via a digitallypreprocessed analog multiplexer. These results pave the way towards low-cost and energy-efficient Terabit Ethernet and a significant step towards achieving DML-based 400-Gbps/λ IM/DD systems in the future.

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