Microsoft Technology Licensing, LLC

Binbin Guan

Yawei Yin

Jamie Dorea Gaudette

Denizcan Billor

Chuan Qin

Liban Buni

Systems and methods are provided for implementing a free space optical backplane structure including a body and a plurality of mirrors. The body includes a chamber, a front panel, and a plurality of apertures disposed in the front panel, the plurality of apertures including a first set of apertures and a second set of apertures. The plurality of mirrors includes first and second arrays of mirrors mounted at first and second sets of heights, respectively, within the chamber, and is aligned with the first and second sets of apertures located in the front panel. The first and second arrays of mirrors are arranged to direct laser signals travelling through free space that are transmitted from or to a first device through the first set of apertures, between the first and second arrays of mirrors, and to or from a corresponding second device through the second set of apertures.

Optical transport terminal node architecture with free space optical backplane

An optical communications network comprises optical data links comprising data channels. A time-domain sampled waveform of a selected data channel is obtained. The Fourier transform is applied to the time-domain sampled waveform of the selected data channel to generate a frequency-domain waveform of the selected data channel. Time-domain sampled waveforms of the selected data channels neighboring data channels are obtained. The Fourier transform is applied to the time-domain sampled waveforms of the neighboring data channels to generate frequency-domain waveforms of the neighboring data channels. The noise-to-signal ratio is calculated based on the frequency-domain waveforms. Based on the calculated noise-to-signal ratio, an optical signal to noise ratio (OSNR) penalty is estimated. A notification is generated when the OSNR penalty exceeds a predetermined threshold.

Characterization of inter-channel crosstalk in an optical network

A power transient event detection system includes a first bank of photodetectors (PDs) located within a first node of an optical communication system. Each PD within the first bank of PDs has a different response time. The system further includes an output signal monitor that monitors signal output from each of the PDs in the first bank and that logs power transient event detection information. A transient event characterizer identifies, based on the logged event detection information, a subset of the PDs in the first bank that observed a power transient event, and determines a duration of the power transient event based on an amount of time that the signal output satisfies low signal criteria for at least one PD in the subset.

Power transient event detection in optical communication systems

A preFEC BER of a selected optical link is determined. A FEC Detected Degrade (FDD) threshold, FEC Excessive Degrade (FED) threshold, and FEC limit threshold are obtained for the selected optical link. The FDD threshold is less than the FED threshold and the FED threshold is less than the FEC limit. Based on the FDD threshold, FED threshold, the FEC limit, and a determination that a postFEC BER==0, it is determined whether a link down condition of the selected optical link can be asserted or de-asserted.

Hysteresis-based link flapping prevention in an optical network

An optical communications network comprises optical data links comprising data channels. A time-domain sampled waveform of a selected data channel is obtained. The Fourier transform is applied to the time-domain sampled waveform of the selected data channel to generate a frequency-domain waveform of the selected data channel. Time-domain sampled waveforms of the selected data channel's neighboring data channels are obtained. The Fourier transform is applied to the time-domain sampled waveforms of the neighboring data channels to generate frequency-domain waveforms of the neighboring data channels. The noise-to-signal ratio is calculated based on the frequency-domain waveforms. Based on the calculated noise-to-signal ratio, an optical signal to noise ratio (OSNR) penalty is estimated. A notification is generated when the OSNR penalty exceeds a predetermined threshold.

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Binbin Guan