Real-Time Demonstration of Homodyne Coherent Bidirectional Transmission for Next-Generation Data Center Interconnects

Gui, Tao; Wang, Xuefeng; Tang, Ming; Yu, Yi; Lu, Yanzhao; Li, Liangchuan

doi:10.1109/jlt.2021.3052826

Cited by 70 publications

(19 citation statements)

References 28 publications

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“…In this section, we review hero fiber-transmission experiments. In the first part, we focus on systems ranging from metro to transoceanic distances [167], [168], [169], [170], [171], [172], [173], [174], [175], [176], [177], [178], [179], [180], [181], [182], [183], [184], [185], [186], [187], [188], [189], [190], [191], [192], [193], [194], [195], [196], [197], [198], [199], [200], [201], [202], [203], [204], [205], [206], whereas, in the second part, we review shorter links where high-speed transmission happens primarily for datacenter interconnect applications [207], [208], [209], [210], [211], [212],…”

Section: S T a T E O F T H E A R T I N T H E F I E L D A N D I N L A ...mentioning

confidence: 99%

“…Communications between data centers that are separated by more than 10 km require more advanced transceiver configurations. Advanced, self-coherent DD schemes, such as the self-homodyne scheme of [207] and [208], show the real-time demonstration of 600 and 800 Gb/s per wavelength, respectively. KK receiver experiments achieving 104 and 279 Gb/s per wavelength are also reported in [134] and [211], and a Stokes receiver system carrying 186 Gb/s per wavelength is demonstrated in [212].…”

Section: Proceedings Of the Ieee 17mentioning

confidence: 99%

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Challenges in Estimating the Information Capacity of the Fiber-Optic Channel

et al. 2022

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Since its early commercial deployment in the late 1980s, optical fiber has evolved to become the predominant carrier of the globe's communications. Yet, after accommodating the world's exponentially growing appetite for transmitted data for more than three decades, its ability to continue doing so is being challenged by fundamental factors. In this article, we review these factors and examine their consequences in terms of information capacity. In particular, we review the difficulties that are imposed by the nonlinear nature of fiber-optic transmission on the assessment of the capacity and on the definition of fundamental concepts, such as bandwidth and spectral efficiency. We discuss relevant approximations and regimes of operation in which bounds for the capacity can be effectively assessed while covering a broad range of applications ranging from interdatacenter communications to links spanning transoceanic distances. We relate to a broad variety of transmission schemes and discuss the potential benefits of spatial multiplexing with multimode and multicore fibers.State-of-the-art transmission experiments are also reviewed and compared with theoretical capacity bounds.

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Section: S T a T E O F T H E A R T I N T H E F I E L D A N D I N L A ...mentioning

confidence: 99%

Section: Proceedings Of the Ieee 17mentioning

confidence: 99%

Challenges in Estimating the Information Capacity of the Fiber-Optic Channel

et al. 2022

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“…. Despite our analysis based on a singlepolarization configuration, polarization-division-multiplexed MZI-ASCD scheme is achievable by means of a controllable polarization rotator that equalizes the power of the CW-tone at the outputs of a polarization beam splitter using cascaded phase shifters and 2 2 × couplers as in [24][25][26]. Alternative approaches include the use of two orthogonal CW-tones separated with a small frequency gap, which is beyond the scope of this paper.…”

Section: Working Principlementioning

confidence: 99%

Asymmetric Self-Coherent Detection Based on Mach-Zehnder Interferometers

O’Sullivan

Xing

et al. 2022

J. Lightwave Technol.

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We propose an asymmetric self-coherent detection scheme (ASCD) based on Mach-Zehnder interferometers (MZI) for the field reconstruction of self-coherent (SC) complex doublesideband (DSB) signals. The MZI-ASCD scheme approaches the high electrical spectral efficiency (ESE) of homodyne coherent detection via a direct detection (DD) receiver having only two photodiodes (PD) and two analog-to-digital converters. The incoming SC-DSB signal is split into two parts at the receiver in this approach, one of which is delayed and beats with the other part at the outputs of an MZI. We show that the field reconstruction can be performed from the two tributaries of photocurrents. In addition, we present a modified MZI-ASCD scheme referred to as AUX-ASCD which introduces an auxiliary DD branch to improve the SNR of the detected signal. It is found that both the MZI-ASCD scheme and the AUX-ASCD scheme achieve higher OSNR sensitivity compared to the Kramers-Kronig scheme and in the meantime increases the ESE by a factor of 2 using a cost-effective DD receiver. These advantages make the ASCD scheme attractive for short-reach optical communications including edge cloud connections and mobile X-haul systems.

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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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Real-Time Demonstration of Homodyne Coherent Bidirectional Transmission for Next-Generation Data Center Interconnects

Cited by 70 publications

References 28 publications

Challenges in Estimating the Information Capacity of the Fiber-Optic Channel

Challenges in Estimating the Information Capacity of the Fiber-Optic Channel

Asymmetric Self-Coherent Detection Based on Mach-Zehnder Interferometers

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

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