End-to-End Multi-Core Fibre Transmission Link Enabled by Silicon Photonics Transceiver with Grating Coupler Array

Hayashi, Tetsuya; Mekis, Attila; Nakanishi, Tetsuya; Peterson, Mark; Sahni, S.; Sun, Peng; Freyling, Steven; Armijo, G.; Sohn, C.; Foltz, D.; Pinguet, Thierry; Mack, M.; Kaneuchi, Yasuomi; Shimakawa, Osamu; Morishima, Tetsu; Sasaki, Takashi; Dobbelaere, P. De

doi:10.1109/ecoc.2017.8346057

Cited by 21 publications

(13 citation statements)

References 5 publications

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“…MCF is an optical fiber with multi-cores in one cladding. The design of MCFs consists of a number of cores, the main core layout, the thickness of the outer cladding, and the diameter of cladding surrounded by 125 µm [9,12,13]. The core pitch (CP) is the homogeneous properties [14] of the MCF, which is the distance between the neighboring cores as shown in Figure 4.…”

Section: Multi-core Fibers (Mcfs)mentioning

confidence: 99%

Design of Four-Core Uncoupled Multicore Fiber for Next-Generation Inter-Data Center Networks

Ponchua

Sitjongsataporn

2021

JMM

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The increasing demands within and between the data centers used for data traffic has required. Efficient links are important to data center applications for supporting the unlimited demand. Transmission capacity of single-mode fiber (SMF) is limited by fiber nonlinearity which prevents the increasing transmission power and finite amplifier bandwidth. Single-mode multi-core fibers (SM-MCFs) that are expected to overcome the current limitation of optical communication capacity. However, the inter-core crosstalk still has an effect on SM-MCF, which can limit the transmission of the inter-data center. In this paper, the design of four-core uncoupled multicore fiber is discussed for next generation inter-data center networks in order to support the unlimited use of data traffic in the future. The objective of this paper is to determine the appropriate range of core radius and core pitch, which are taken into consideration to reduce the inter-core crosstalk inside the optical fiber. These parameters can be able to improve various constraints to achieve the best multi-core fibers design. From the simulation concerned with the inter-core crosstalk, the experiment results show that the range of core pitch is at 47.5 μm to 50 μm and the range of core radius starts from 4.5 μm to 5.5 μm, that can achieve with crosstalk lower than – 30 dB/100 km for the future inter-data center networks.

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Section: Multi-core Fibers (Mcfs)mentioning

confidence: 99%

Design of Four-Core Uncoupled Multicore Fiber for Next-Generation Inter-Data Center Networks

Ponchua

Sitjongsataporn

2021

JMM

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“…Due to its compatibility with mature CMOS manufacturing techniques, compact size and cost effectiveness, integrated silicon photonics have been well developed as an engine for optical transceivers [ 1 , 2 , 3 , 4 ] and widely deployed in datacenters for high-speed, short-reach connections. Transceiver engines combine many elemental silicon photonics components, such as waveguides, splitters, I/O couplers, phase shifters and multiplexers (MUXs) and are able to process 100 Gb/s or 400 Gb/s signals, which currently dominate 500 m to 2 km intra-datacenter communications.…”

Section: Introductionmentioning

confidence: 99%

Low-Cost 400 Gbps DR4 Silicon Photonics Transmitter for Short-Reach Datacenter Application

et al. 2021

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Targeting high-speed, low-cost, short-reach intra-datacenter connections, we designed and tested an integrated silicon photonic circuit as a transmitter engine. This engine can be packaged into an optical transceiver module which meets the QSFP-DD Form Factor, together with other electrical/optical components. We first present the design and performance of a high-speed silicon modulator, which had a 3-dB EO bandwidth of >40 GHz and an ER of >5 dB. We then incorporated the engine onto a test board and injected a 53.125 Gbaud PAM4 signal. Clear eye patterns were observed at the receiver with TDECQ ~3 dB for all four lanes.

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“…In recent years, multi-core fiber (MCF) is becoming increasingly popular in DCNs due to its compactness, showing multiple cores co-packaged with optical transceivers for short-reach data communications [7], [8]. A major benefit of homogeneous core MCF, as explored in [9], [10], [11], is the low temperature-induced skew between cores.…”

Section: Introductionmentioning

confidence: 99%

Clock and Data Recovery-Free Data Communications Enabled by Multi-Core Fiber With Low Thermal Sensitivity of Skew

Sohanpal

Clark

Puttnam

et al. 2020

J. Lightwave Technol.

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Optical switching has the potential to scale the capacity of data center networks (DCN) with a simultaneously reduction in latency and power consumption. One of the main challenges of optically-switched DCNs is the need for fast clock and data recovery (CDR). Because the DCN traffic is dominated by small packets, the CDR locking time is required to be less than one nanosecond for achieving high network throughput. This need for sub-nanosecond CDR locking time has motivated research on optical clock synchronization techniques, which deliver synchronized clock signals through optical fibers such that the CDR modules in each transceiver only need to track the slow change of clock phase, due to change of the time of flight as temperature varies. It is desired to remove the need for clock phase tracking (and thereby the CDR modules) if the temperatureinduced clock phase drift can be significantly reduced, which would reduce the power consumption and the cost of transceivers. Previous studies have shown that the temperature-induced skew change between multi-core fiber (MCF) cores can be forty times lower than that of standard single mode fibers. Thus, clock-synchronized transmission maybe possible by using two different MCF cores for clock and data transmission, respectively, enabling the sharing of an optical clock with stable clock phase. To investigate the potential of MCF for CDR-free short-reach communications, we first improve the measurement method of the temperature dependent inter-core skew change by using a modified delay interferometer, achieving a resolution of 3.8 femtoseconds for accurate inter-core skew measurements. Building on the MCF measurement results, we carried out an MCF-based clock-synchronized transmission experiment, demonstrating the feasibility of CDR-free data communications over a temperature range of 43 • C that meets DCN requirements. Index Terms-Data center networks, clock synchronization, Multi-core fiber, Thermal coefficient of delay.

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End-to-End Multi-Core Fibre Transmission Link Enabled by Silicon Photonics Transceiver with Grating Coupler Array

Cited by 21 publications

References 5 publications

Design of Four-Core Uncoupled Multicore Fiber for Next-Generation Inter-Data Center Networks

Design of Four-Core Uncoupled Multicore Fiber for Next-Generation Inter-Data Center Networks

Low-Cost 400 Gbps DR4 Silicon Photonics Transmitter for Short-Reach Datacenter Application

Clock and Data Recovery-Free Data Communications Enabled by Multi-Core Fiber With Low Thermal Sensitivity of Skew

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