Programmable Wavelength Locking and Routing in a Silicon-Photonic Interconnection Network Implementation

Calhoun, David M.; Li, Qi; Browning, Colm; Abrams, Nathan C.; Liu, Yang; Ding, Ran; Barry, Liam P.; Baehr‐Jones, Tom; Hochberg, Michael; Bergman, Keren

doi:10.1364/ofc.2015.tu2h.3

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…This can be solved by, for example, contention resolution schemes implemented in the control plane. It is worth noting that this architecture is readily applicable to passive and active wavelength routing by tuning the rings to different wavelengths 16 . Figure 1 Schematic representation of input-output connectivity of silicon photonic microring switching architecture; (left) depiction of chipscale integration of eight-microrings multiplexers and demultiplexers to achieve connections between inputs, I n , and outputs, O m (note that not all connections are shown for brevity); (right-bottom) indexed representation of all potential intermediate cross-connects between multiplexers and demultiplexers; (right-middle) implanted on-chip heaters consisting of highly doped regions connected with metallic conductors, inducing a shift in microring resonance proportional to applied power; (right-top) a microring between two waveguides acting as a switch of an input signal between the through and the drop ports.…”

Section: Switch Architecturementioning

confidence: 99%

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Modular architecture for fully non-blocking silicon photonic switch fabric

Nikolova¹,

Calhoun²,

Liu³

et al. 2017

Microsyst Nanoeng

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Integrated photonics offers the possibility of compact, low energy, bandwidth-dense interconnects for large port count spatial optical switches, facilitating flexible and energy efficient data movement in future data communications systems. To achieve widespread adoption, intimate integration with electronics has to be possible, requiring switch design using standard microelectronic foundry processes and available devices. We report on the feasibility of a switch fabric comprised of ubiquitous silicon photonic building blocks, opening the possibility to combine technologies, and materials towards a new path for switch fabric design. Rather than focus on integrating all devices on a single silicon chip die to achieve large port count optical switching, this work shifts the focus towards innovative packaging and integration schemes. In this work, we demonstrate 1 × 8 and 8 × 1 microring-based silicon photonic switch building blocks with software control, providing the feasibility of a full 8 × 8 architecture composed of silicon photonic building blocks. The proposed switch is fully non-blocking, has path-independent insertion loss, low crosstalk, and is straightforward to control. We further analyze this architecture and compare it with other common switching architectures for varying underlying technologies and radices, showing that the proposed architecture favorably scales to very large port counts when considering both crosstalk and architectural footprint. Separating a switch fabric into functional building blocks via multiple photonic integrated circuits offers the advantage of piece-wise manufacturing, packaging, and assembly, potentially reducing the number of optical I/O and electrical contacts on a single die.

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Section: Switch Architecturementioning

confidence: 99%

“…Hardware-software integrated silicon photonic subsystems controlled by means of custom firmware implemented in field programmable gate arrays (FPGAs) [14][15][16] and applicationspecific integrated circuits (ASICs) 17 have been demonstrated, offering the possibility for more advanced network functionalities.…”

Section: Introductionmentioning

confidence: 99%

Modular architecture for fully non-blocking silicon photonic switch fabric

Nikolova¹,

Calhoun²,

Liu³

et al. 2017

Microsyst Nanoeng

Self Cite

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“…All prior experimental demonstrations are either using two microrings as a 2×2 switch or only showing 1×2 switching of a single microring. From an architectural point of view, reducing the number of microrings in a switch matrix can reduce the footprint, cost, and power consumption, as well as greatly simplify the complexity of the associated control system of microring wavelength stabilization and locking [16]. To the best of our knowledge, no previous experimental work has ever shown full 2×2 functionality based on single microrings (Fig.…”

Section: Motivationmentioning

confidence: 99%

“…This can be accomplished using control system sampling with greater precision, which could be achieved via more capable analog to digital conversion. Therefore, a wavelength locking scheme is essential in future applications [16].…”

Section: Dutmentioning

confidence: 99%

Single Microring-Based <inline-formula> <tex-math notation="LaTeX">$2\times 2$ </tex-math></inline-formula> Silicon Photonic Crossbar Switches

Nikolova

Calhoun

et al. 2015

IEEE Photon. Technol. Lett.

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Realizing small-footprint and energy-efficient optical switching fabrics is of crucial importance to solve the data movement challenges faced by optical interconnection networks. This article demonstrates silicon photonic 2×2 full crossbar switching functionality based on a single microring. The ultra-compact device is shown to successfully switch data channels from two input ports simultaneously. Data channels in both multiple and same wavelength switching experiments are measured to be error-free. Simulation shows that by optimizing some of the microring parameters crosstalk could be reduced. This work confirms the applicability of a single microring as a 2×2 switch element for on-chip optical interconnects.

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“…Silicon photonics arise as a promising technological candidate with high port count photonic fabrics already presented in the literature offering low cost due to their CMOS compatible fabrication processes and fast response time in the µs or even in the ns regime [12][13][14][15][16]. Moreover, they have been recently demonstrated in multi-casting routing schemes [15], as well as in software-programmable setups, exploiting photonic hardware-software co-development efforts [15,[17][18][19][20][21][22] in order to gradually enrich their portfolio towards supporting the increased dynamicity and reconfigurability required in DC environments.…”

Section: Introductionmentioning

confidence: 99%

Silicon Photonics towards Disaggregation of Resources in Data Centers

et al. 2018

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Abstract:In this paper, we demonstrate two subsystems based on Silicon Photonics, towards meeting the network requirements imposed by disaggregation of resources in Data Centers. The first one utilizes a 4 × 4 Silicon photonics switching matrix, employing Mach Zehnder Interferometers (MZIs) with Electro-Optical phase shifters, directly controlled by a high speed Field Programmable Gate Array (FPGA) board for the successful implementation of a Bloom-Filter (BF)-label forwarding scheme. The FPGA is responsible for extracting the BF-label from the incoming optical packets, carrying out the BF-based forwarding function, determining the appropriate switching state and generating the corresponding control signals towards conveying incoming packets to the desired output port of the matrix. The BF-label based packet forwarding scheme allows rapid reconfiguration of the optical switch, while at the same time reduces the memory requirements of the node's lookup table. Successful operation for 10 Gb/s data packets is reported for a 1 × 4 routing layout. The second subsystem utilizes three integrated spiral waveguides, with record-high 2.6 ns/mm 2 , delay versus footprint efficiency, along with two Semiconductor Optical Amplifier Mach-Zehnder Interferometer (SOA-MZI) wavelength converters, to construct a variable optical buffer and a Time Slot Interchange module. Error-free on-chip variable delay buffering from 6.5 ns up to 17.2 ns and successful timeslot interchanging for 10 Gb/s optical packets are presented.

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Programmable Wavelength Locking and Routing in a Silicon-Photonic Interconnection Network Implementation

Cited by 11 publications

References 7 publications

Modular architecture for fully non-blocking silicon photonic switch fabric

Modular architecture for fully non-blocking silicon photonic switch fabric

Single Microring-Based <inline-formula> <tex-math notation="LaTeX">$2\times 2$ </tex-math></inline-formula> Silicon Photonic Crossbar Switches

Silicon Photonics towards Disaggregation of Resources in Data Centers

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