Microsoft Technology Licensing, LLC

Kai Shi

Paolo Costa

Hitesh Ballani

Daniel Jonathan Finchley Cletheroe

Foteini Karinou

Istvan Haller

Sophie Gloria Lange

Krzysztof Jozwik

Christian L Belady

Charles Walter Boecker

Winston Allen Saunders

Douglas M Carmean

Lisa Ru-feng Hsu

Richard James Baca

Gilberto Brambilla

Raphael Eric Alfred Behrendt

Benn Charles Thomsen

Ariel Gomez Diaz

Junyi Liu

Vasily Lyutsarev

Shawn Yohanes Siew

Kaoutar Benyahya

A transmission method comprising: encoding a message into error correction coding blocks, each comprising a different portion of the payload bits of the message and a respective plurality of error correction bits; and applying an interleaving map to error correction coding blocks, such that for each error correction coding block, different bits of the error correction coding block are mapped to different channels, each channel thus being used to transmit bits from a respective selection of multiple of the error correction coding blocks. Thus, for at least one channel failure scenario in which at least one of the plurality of channel fails leaving a plurality of remaining channels, enough bits will remain on the remaining channels to enable correction of the message based on the error correction coding.

Error-resistant data communication using multiple channels

A switching network for effecting point-to-point communication between nodes has a time-varying switching configuration, which causes successive activation and deactivation of multiple channels of the switching network, a first of the channels connecting, when activated, a transmitter node and a first receiver node, and a second of the channels connecting, when activated, the transmitter node and a second receiver node. In a training phase, a method comprises: transmitting from the transmitter node via each channel a known training signal, to cause each receiver node to receive a distorted training signal, using the first distorted training signal and knowledge of the first known training signal to determine respective one or more transmit-side equalizer (EQ) coefficients for each channel, and storing, in memory accessible to the transmitter node, the first transmit-side EQ coefficients, in association with each channel, for use in conducting scheduled communications over the switching network in a communications phase.

Communication in a switching network

A method of fabricating a graded-index polymer optical fibre comprises preparing a cladding composition, the cladding composition comprising either a mixture of a cladding polymer and a dopant or a mixture of a cladding polymer precursor and a dopant; forming cladding from the cladding composition around a core, the core comprising a core polymer; and causing diffusion of the dopant into the core such that the dopant has a continuous concentration gradient, according to which concentration gradient the concentration of the dopant increases with radial distance from a centre of the core. The dopant is a compound having a refractive index which is lower than a refractive index of the core polymer. By distributing the dopant such that the dopant concentration is lowest at the centre of the core, the optical attenuation of the graded-index polymer optical fibre may be reduced. Also provided is a graded-index polymer optical fibre obtainable by the method.

Graded-index polymer optical fibre and the fabrication thereof

A method of fabricating a multi-core polymer optical fibre comprises arranging optical fibre preforms in a stack, the optical fibre preforms each comprising a polymer core and polymer cladding surrounding the polymer core; and drawing and bonding the stack to form the multi-core polymer optical fibre. Any contaminants or impurities which collect on outer surfaces of the preforms may be confined to boundaries between the preforms, which may avoid attenuation of signals passed through the cores while at the same time reducing crosstalk between cores of the final manufactured fibre. Also provided is a multi-core polymer optical fibre obtainable by the method.

Multi-core polymer optical fibre and the fabrication thereof

A system for interconnecting a plurality of computing nodes includes a plurality of optical circuit switches and a plurality of electrical circuit switches. A first network stage comprises a first plurality of circuit switches selected from among the plurality of optical circuit switches and the plurality of electrical circuit switches. Each computing node among the plurality of computing nodes is optically coupled to at least one of the first plurality of circuit switches. A second network stage comprises a second plurality of circuit switches selected from among the plurality of optical circuit switches and the plurality of electrical circuit switches. Each circuit switch among the first plurality of circuit switches is optically coupled to each circuit switch among the second plurality of optical circuit switches.

Efficiently interconnecting a plurality of computing nodes to form a circuit-switched network

In various examples there is a communications network comprising a plurality of nodes connected via an interconnection medium to form a receive-from-many communications network. The network has a synchronisation mechanism which synchronizes a signal frequency of the nodes. The network has at least one store holding signal amplitude data of signals previously sent between specified pairs of nodes of the communications network. An amplitude controller uses the stored data to adjust amplitudes of signals communicated between at least one of the pairs of nodes of the communications network.

Amplitude caching in receive from many communications networks

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Cambridge, United Kingdom

Kai Shi