80-GHz Bandwidth and 1.5-V V<sub>π</sub> InP-Based IQ Modulator

Ogiso, Yoshihiro; Hashizume, Yoshio; Tanobe, Hiromasa; Nunoya, Nobuhiro; Ida, M.; Miyamoto, Yutaka; Ishikawa, Masahito; Ozaki, Josuke; Ueda, Yuta; Wakita, Hitoshi; Nagatani, Munehiko; Yamazaki, Hiroshi; Nakamura, Masanori; Kobayashi, Takayuki; Kanazawa, Shigeru

doi:10.1109/jlt.2019.2924671

Cited by 87 publications

(31 citation statements)

References 10 publications

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“…However, graphene-based PDs are still difficult to be applied in 200-Gbit/s, 400-Gbit/s, or even higher 800-Gbit/s optical interconnections 28 , while direct detection mode is exploited. To meet the growing capacity demands of global data traffic, coherent optical communication 29 adopting advanced modulation formats and digital signal processing (DSP) can increase the spectral efficiency and the data transmission capacity [30][31][32][33] . At the receiving end of the coherent optical communication system, the optical coherent receiver (OCR) [34][35][36][37] that combines a 90-degree optical hybrid and four PDs (single polarization), can decode the information carried on the amplitude and phase of the light, achieving the multiple increases of the receiving capacity.…”

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confidence: 99%

Ultrahigh-speed graphene-based optical coherent receiver

Wang

Jiang

et al. 2021

Nat Commun

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Graphene-based photodetectors have attracted significant attention for high-speed optical communication due to their large bandwidth, compact footprint, and compatibility with silicon-based photonics platform. Large-bandwidth silicon-based optical coherent receivers are crucial elements for large-capacity optical communication networks with advanced modulation formats. Here, we propose and experimentally demonstrate an integrated optical coherent receiver based on a 90-degree optical hybrid and graphene-on-plasmonic slot waveguide photodetectors, featuring a compact footprint and a large bandwidth far exceeding 67 GHz. Combined with the balanced detection, 90 Gbit/s binary phase-shift keying signal is received with a promoted signal-to-noise ratio. Moreover, receptions of 200 Gbit/s quadrature phase-shift keying and 240 Gbit/s 16 quadrature amplitude modulation signals on a single-polarization carrier are realized with a low additional power consumption below 14 fJ/bit. This graphene-based optical coherent receiver will promise potential applications in 400-Gigabit Ethernet and 800-Gigabit Ethernet technology, paving another route for future high-speed coherent optical communication networks.

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confidence: 99%

Ultrahigh-speed graphene-based optical coherent receiver

Wang

Jiang

et al. 2021

Nat Commun

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“…The top n-type layer uses a reverse trapezoid to reduce the contact resistance. Two years later, the modulator employing the same structure achieved bandwidth up to 80 GHz, which is the best InP-based modulation performance reported so far [46].…”

Section: Inp Modulatormentioning

confidence: 76%

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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“…Further enhancement of the EO effect can be accomplished with the quantum-confined Stark effect in quantum wells, but at the cost of higher temperature and wavelength dependence. Modulators and detectors with bandwidths exceeding 80 GHz have been demonstrated using the InP material system [20], [21], which, together with the capability for monolithic integration of various types of laser circuits [22], [23], makes InP PICs very attractive for cointegration with EICs. On the electronics side, generic foundry processes such as the 0.25 µm BiCMOS technology have been found to be well suited for high-speed transmitter and receiver front-ends [24]- [26].…”

Section: Introductionmentioning

confidence: 99%

Towards the Integration of InP Photonics With Silicon Electronics: Design and Technology Challenges

Yao

Liu

Matters-Kammerer

et al. 2021

J. Lightwave Technol.

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Intimate integration of photonics with electronics is regarded as the key to further improvement in bandwidth, speed and energy efficiency of information transport systems. Here, a method based on wafer-scale polymer bonding is reviewed which is compatible with foundry-sourced high-performance InP photonics and BiCMOS electronics. We address challenges with respect to circuit architecture, co-simulation framework and interconnect technology and introduce our approach that can lead to broadband high-density interconnects between photonics and electronics. Recent proof-of-concept work utilizing DC-coupled driver connections to modulators, which significantly reduces the interconnect complexity, is summarized. Furthermore, cosimulation concepts based on equivalent circuit models are discussed with emphasis on the importance of impedance matching between driver and modulator. Finally, realizations of broadband interconnects and functional photonic building blocks after wafer bonding are highlighted to demonstrate the potential of this wafer-scale co-integration method.

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80-GHz Bandwidth and 1.5-V V_π InP-Based IQ Modulator

Cited by 87 publications

References 10 publications

Ultrahigh-speed graphene-based optical coherent receiver

Ultrahigh-speed graphene-based optical coherent receiver

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

Towards the Integration of InP Photonics With Silicon Electronics: Design and Technology Challenges

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80-GHz Bandwidth and 1.5-V Vπ InP-Based IQ Modulator

Cited by 87 publications

References 10 publications

Ultrahigh-speed graphene-based optical coherent receiver

Ultrahigh-speed graphene-based optical coherent receiver

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

Towards the Integration of InP Photonics With Silicon Electronics: Design and Technology Challenges

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Product

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80-GHz Bandwidth and 1.5-V V_π InP-Based IQ Modulator