Analog Coherent Detection for Energy Efficient Intra-Data Center Links at 200 Gbps Per Wavelength

Hirokawa, Takako; Pinna, Sergio; Hosseinzadeh, Navid; Maharry, Aaron; Andrade, Hector; Liu, Junqian; Meißner, Thomas; Misak, Stephen M.; Movaghar, Ghazal; Valenzuela, Luis A.; Xia, Yujie; Bhat, Shireesh; Gambini, Fabrizio; Klamkin, Jonathan; Saleh, A.A.M.; Coldren, L.A.; Buckwalter, James F.; Schow, Clint L.

doi:10.1109/jlt.2020.3029788

Cited by 58 publications

(16 citation statements)

References 40 publications

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“…It builds on three key notions: First, homodyne reception is supported through optical injection locking [20] of the LO. In case of the EML-inspired receptor, this means that the incident synapse locks the distributed feedback (DFB) laser of the EML all-optically, which is considered to be simpler than alternative approaches such as phase-locked loops [21,22]. The mechanism of injection locking will be characterized in Section III.…”

Section: B Coherent Synaptic Receptormentioning

confidence: 99%

Simplified Coherent Synaptic Receptor for Filterless Optical Neural Networks

Schrenk

2022

IEEE J. Select. Topics Quantum Electron.

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Neuromorphic computing is touted to be a game changer for existing and emerging data processing applications. Towards this direction, artificial neural network implementations have moved into the focus of research. Advancing neural networks to the optical domain offers several advantages, such as high data throughput at time-of-flight inference latency. The present work proposes coherent synaptic interconnects as a path towards filterless neural networks with increased routing flexibility. A coherent synaptic receptor with integrated weighing functionality is experimentally investigated and evaluated for a 1-GHz train of 130-ps wide spikes. Homodyne detection is accomplished through use of an optically injection locked local oscillator, while its phase and the responsivity of the co-integrated photodiode are exploited to realize a tunable weight upon reception of the incoming optical spikes. Moreover, the switching of the sign is shown for the detection weight, underpinning the feasibility to extend the allocation of synapses toward both, wavelength and time dimensions.

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Section: B Coherent Synaptic Receptormentioning

confidence: 99%

Simplified Coherent Synaptic Receptor for Filterless Optical Neural Networks

Schrenk

2022

IEEE J. Select. Topics Quantum Electron.

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“…However, homodyne detection requires a precise matching between input signal and local oscillator (LO), which can significantly increase the complexity of the detection process. Different methods have been proposed towards this direction, including optical phase-locked loops or injection locking [7,8]. In this work, we build on a greatly simplified homodyne detector: the EML.…”

Section: Ii) Coherent Optical Synaptic Interconnectmentioning

confidence: 99%

Coherent Homodyne Synaptic Interconnect with Sign- and Weight-Tunable Detection

Schrenk

2021

Optical Fiber Communication Conference (OFC) 2021

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“…However, due to inherent sensibility to cost, there is a challenge for a trade-off between the performance and cost in short-reach communication. There are already a variety of simplified ideas, such as analogy coherent [14] and selfhomodyne coherent [15,16]. The self-homodyne coherent can remove the frequency offset estimate and carrier phase recovery, but it is only be limited to the perfect matching length between LO path and signal path.…”

Section: Introductionmentioning

confidence: 99%

4×112 Gb/s/λ MCF Transmission Using Field PDM-PAM4 and Coherent Detection for Datacenter Applications

Gao

Luo³

et al. 2022

IEEE Photonics J.

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The inter-data center links are meeting the challenge of increasing transmission capacity continuously. Here, the tradeoff between transmission capacity and cost and power consumption especially needs to be considered. The field modulation polarization-division-multiplexed (PDM) four-level pulse amplitude modulation (PAM4) with coherent detection is a potential candidate for 400 Gb/s and beyond inter-data center transmissions, which has several advantages including low-cost, low optical signal to noise ratio (OSNR) requirement and high receiver sensitivity. In this paper, the feasibility and effectiveness of the field PDM-PAM4 coherent system are investigated over multi core fiber (MCF). In order to adapt to the field PAM signals, the signal-phase aid least-mean square (SP-LMS) and training multi-modulus algorithm (TMMA) are modified and analyzed for equalization and polarization demultiplexing. Finally, it is demonstrated that 4×112 Gb/s field PDM-PAM4 is successful transmitted over 16 km MCF and 384 km SSMF in C-band with a BER below 3.8e-3.

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Analog Coherent Detection for Energy Efficient Intra-Data Center Links at 200 Gbps Per Wavelength

Cited by 58 publications

References 40 publications

Simplified Coherent Synaptic Receptor for Filterless Optical Neural Networks

Simplified Coherent Synaptic Receptor for Filterless Optical Neural Networks

Coherent Homodyne Synaptic Interconnect with Sign- and Weight-Tunable Detection

4×112 Gb/s/λ MCF Transmission Using Field PDM-PAM4 and Coherent Detection for Datacenter Applications

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