Mode-Division Multiplexing for Silicon Photonic Network-on-Chip

Wu, Xinru; Huang, Chaoran; Xu, Ke; Shu, Chester; Tsang, Hon Ki

doi:10.1109/jlt.2017.2677085

Cited by 103 publications

(30 citation statements)

References 36 publications

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“…Optical fiber communication systems and optical interconnects are now facing enormous demands on rapid bandwidth consumption of network traffics, especially in booming datacenters 1 , 2 . Besides, the growth of highly efficient computational systems leads to the increasing needs for high-bandwidth for information exchange centers 3 . To develop high-speed signal processing systems, some solutions have been proposed to scale the communication bandwidth aiming to overcome the barriers due to nonlinear limits 4 , 5 .…”

Section: Introductionmentioning

confidence: 99%

On-chip silicon photonic controllable 2 × 2 four-mode waveguide switch

Truong¹,

Hang²,

Chandrahalim

et al. 2021

Sci Rep

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Multimode optical switch is a key component of mode division multiplexing in modern high-speed optical signal processing. In this paper, we introduce for the first time a novel 2 × 2 multimode switch design and demonstrate in the proof-of-concept. The device composes of four Y-multijunctions and 2 × 2 multimode interference coupler using silicon-on-insulator material with four controllable phase shifters. The shifters operate using thermo-optic effects utilizing Ti heaters enabling simultaneous switching of the optical signal between the output ports on four quasi-transverse electric modes with the electric power consumption is in order of 22.5 mW and the switching time is 5.4 µs. The multimode switch exhibits a low insertion loss and a low crosstalk below − 3 dB and − 19 dB, respectively, in 50 nm bandwidth in the third telecom window from 1525 to 1575 nm. With a compact footprint of 10 µm × 960 µm, this device exhibits a relatively large width tolerance of ± 20 nm and a height tolerance of ± 10 nm. Furthermore, the conceptual principle of the proposed multimode switch can be reconfigurable and scalable in multifunctional on-chip mode-division multiplexing optical interconnects.

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Section: Introductionmentioning

confidence: 99%

On-chip silicon photonic controllable 2 × 2 four-mode waveguide switch

Truong¹,

Hang²,

Chandrahalim

et al. 2021

Sci Rep

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“…One is the mode‐division multiplexing (MDM) using multiple guided modes, and the other one is using multiple cores . These two have been studied not only for the long‐haul networks but also for short‐distance optical interconnects (including photonic networks‐on‐chip) . For SDM systems, some special photonic devices and circuits are needed.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐Sharp Multimode Waveguide Bends with Subwavelength Gratings

Song

et al. 2019

Laser & Photonics Reviews

110

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Mode‐division multiplexing (MDM) is attractive to enhance the link capacity of optical interconnects by using multiple mode‐channels in multimode bus waveguides. As sharp waveguide bends are very important for realizing dense photonic integrated circuits, here ultra‐sharp multimode waveguide bends for MDM systems are proposed and demonstrated by using subwavelength grating waveguide structures on silicon. An ultra‐sharp S‐bend with a radius of 10 µm is realized for the first time to enable a low‐loss and low‐crosstalk MDM optical interconnect with three mode‐channels. For this proposed ultra‐sharp subwavelength grating multimode waveguide bend (SMWB) with a 90° bending angle, the theoretical excess losses for the TE0, TE1, and TE2 modes are 0.1–0.3 dB, 0.18–0.22 dB, and 0.3–0.5 dB, respectively, in a wavelength band of 1500–1600 nm. Meanwhile, inter‐mode crosstalks are very low (less than −30 dB) for all mode‐channels. For the fabricated 90°‐SMWB, the excess losses for the TE0, TE1, and TE2 modes are 0.1–0.3 dB, 0.2–0.4 dB, and 0.3–0.7 dB while the inter‐mode crosstalk is approximately −22 dB in a wavelength band of 1520–1600 nm. The proposed SMWB is also extended for more than three mode‐channels.

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“…In addition to wavelength-division multiplexing (WDM), the mode-division multiplexing (MDM) which utilizes different optical modes as independent channels has recently become an efficient technology to further improve the transmission capacity [1]- [3]. Thanks to the great potential of increasing optical communications capacity without excessive optical sources [4], [5], a number of impressive results in few-mode fibers had been obtained [6]- [8]. On the other hand, taking advantages of silicon integrated platform, the on-chip MDM investigations are receiving more and more attentions in recent years.…”

Section: Introductionmentioning

confidence: 99%

Crosstalk Suppressed High Efficient Mode-Selective Four-Wave Mixing Through Tailoring Waveguide Geometry

Xiong

Yang

et al. 2019

IEEE Photonics J.

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We propose and demonstrate improved and accurate design criteria for modeselective nonlinear waveguides, using a complete multimode theoretical model. Being different from previously reported schemes where only the cross section was considered, the nonlinear conversion efficiency can be further enhanced in the proposed scheme by means of elaborately designing both the waveguide length and cross section. Furthermore, the modal crosstalks introduced by the intermode nonlinear processes are thoroughly discussed and significantly suppressed. A two-mode nonlinear circuit using asymmetric directional coupler based multiplexer/de-multiplexer and an optimized multimode waveguide is fabricated for demonstration, utilizing a silicon integrated platform. Experimental results show that the highest conversion efficiencies of fundamental transverse electric and first order transverse electric modes are −20.44 and −23.15 dB, respectively, with nonlinear crosstalks less than −19 dB.

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Mode-Division Multiplexing for Silicon Photonic Network-on-Chip

Cited by 103 publications

References 36 publications

On-chip silicon photonic controllable 2 × 2 four-mode waveguide switch

On-chip silicon photonic controllable 2 × 2 four-mode waveguide switch

Ultra‐Sharp Multimode Waveguide Bends with Subwavelength Gratings

Crosstalk Suppressed High Efficient Mode-Selective Four-Wave Mixing Through Tailoring Waveguide Geometry

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