SiN/Si double-layer platform for ultralow-crosstalk multiport optical switches

Konoike, Ryotaro; Suzuki, Keijiro; Tanizawa, Ken; Suda, Satoshi; Matsuura, Hiroyuki; Namiki, Shu; Kawashima, Hitoshi; Ikeda, Kazuhiro

doi:10.1364/oe.27.021130

Cited by 26 publications

(25 citation statements)

References 14 publications

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“…Therefore, we consider that the PILOSS topology has potential advantages for larger port count switches. In future, however, if multilayer platform technologies [17], [18] that can eliminate the insertion loss of the intersection get matured, the switch-and-select topology may be an option. The double-layer network [19] that is a different version of switch-and-select topology will be also another option in terms of loss, although the power consumption of the switch-and-select topology will be an issue for a large-port-count switch since the number of bar-state switches (ON switches) is much larger than that of the other topologies.…”

Section: Table I Optical Switch Technologiesmentioning

confidence: 99%

Low-Loss, Low-Crosstalk, and Large-Scale Optical Switch Based on Silicon Photonics

Suzuki

Konoike

Suda

et al. 2020

J. Lightwave Technol.

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We review the research progress of strictly nonblocking optical switches based on silicon photonics. We have developed a switch chip fabrication process based on a complementary metal-oxide-semiconductor pilot line and optical and electrical packaging technologies. We demonstrated all-paths transmission and switching of up to 32 input ports × 32 output ports with an average fiber-to-fiber insertion loss of 10.8 dB. Furthermore, we demonstrated an operating bandwidth wider than 100 nm for −30 dB crosstalk with double-Mach-Zehnder element switches in an 8 × 8 switch. For polarization-insensitive operation, we adopted a polarization diversity scheme and fabricated an 8 × 8 switch with fiber-based polarization-beam-splitters and two switch chips. The 8 × 8 switch exhibited a polarization-dependent loss of less than 0.5 dB. Moreover, an on-chip polarization diversity 8 × 8 switch integrated with polarization splitter rotators and two switch matrices on a single chip demonstrated a differential group delay less than 1 ps. Based on current technologies, we discuss the prospects for further port count expansion and remaining challenges for commercial deployment.

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Section: Table I Optical Switch Technologiesmentioning

confidence: 99%

Low-Loss, Low-Crosstalk, and Large-Scale Optical Switch Based on Silicon Photonics

Suzuki

Konoike

Suda

et al. 2020

J. Lightwave Technol.

Self Cite

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“…It changes direction from the horizontal of a plane to the vertical part. The former could use an overlay junction [6], while the latter could be found [29]. Thus, the four-port modules will not cause technical problems when adding layers.…”

Section: Switch Topologies Studymentioning

confidence: 99%

“…However, the practical challenge of optical switches is to eliminate the insertion loss and crosstalk [3]. Currently, the most advanced large-scale architectures include Switchand-Select [6], Benes [7], [8], Clos-Benes [9], PILOSS [10], Spanke-Benes [11], and Fat-tree [12], [13]. Among these methods, the Benes method is a promising technology as it eliminates insertion loss with the least number of optical switches [14].…”

Section: Introductionmentioning

confidence: 99%

Bi-Directional Benes With Large Port-Counts and Low Waveguide Crossings for Optical Network-on-Chip

2021

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We propose a new variant of the Benes network using a merge-replace-fold approach. It is to realize a large port-count optical switch with low waveguide crossings. A bidirectional switch is built instead of a unidirectional switch. Compared to the classical Benes, it requires the same number of switches but far fewer intersections. The novel designs enable a 24-percentage reduction in waveguide intersections. Moreover, it has a worst-case insertion loss of 12.01 dB and a comparable crosstalk level of -13.67 dB between the neighbouring paths. Thus, it is suitable for use in high-speed optical networks-on-chip.INDEX TERMS Optical interconnections, Optical NoC, Silicon photonics, Optical resonators, Optical switches.

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“…PTICAL switches are of importance in next-generation telecom and datacom applications with reduced energy consumptions [1][2][3]. Waveguide-based planar optical switches have recently attracted considerable attention because they are advantageous in terms of cost and reliability [4][5][6][7]. Most waveguide-based optical switches utilize only one layer of waveguides.…”

Section: Introductionmentioning

confidence: 99%

“…Most waveguide-based optical switches utilize only one layer of waveguides. A multi-layer optical circuit is beneficial to reduce the crosstalk, although it increases the design complexity; i.e., a small interlayer gap causes a large loss at the intersection, while a large interlayer gap causes a large loss at the transition structure [7,8]. We consider that for small-and mid-scale switches, single-layer optical circuits are advantageous because of their simple designs, simple fabrication processes, and lowloss characteristics.…”

Section: Introductionmentioning

confidence: 99%

Port-Alternated Switch-and-Select Optical Switches

Konoike

Suzuki

Kawashima

et al. 2021

J. Lightwave Technol.

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We propose and demonstrate a port-alternated switch-and-select architecture for planar waveguide-based optical switches. The proposed architecture reduces the number of intersections on a path, which leads to both small insertion loss and small path dependence. We demonstrate an 8 × 8 optical switch based on the proposed architecture using a silicon photonic platform, which exhibits a fiber-to-fiber insertion loss of 5.7 dB with a crosstalk below −30 dB. We discuss the scalability of the switch, including the propagation and bend losses of the waveguides.

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SiN/Si double-layer platform for ultralow-crosstalk multiport optical switches

Cited by 26 publications

References 14 publications

Low-Loss, Low-Crosstalk, and Large-Scale Optical Switch Based on Silicon Photonics

Low-Loss, Low-Crosstalk, and Large-Scale Optical Switch Based on Silicon Photonics

Bi-Directional Benes With Large Port-Counts and Low Waveguide Crossings for Optical Network-on-Chip

Port-Alternated Switch-and-Select Optical Switches

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