AT&T Intellectual Property I, LP

Lynn Nelson

Xiang Zhou

Peter David Magill

Mark David Feuer

Mikhail Brodsky

Jungmi Oh

Sheryl Leigh Woodward

Paul Shala Henry

Martin Birk

Jonathan A Nagel

Michael Brodsky

Cristian Antonelli

A method and system for distributed spatial mode processing is disclosed. A number of optical signals are received over an optical link. Each optical signal is received via a respective one of a number of spatial modes of the optical link. The optical link includes a particular spatial mode not used for the receiving. A first one of the number of optical signals received from a first one of the number of spatial modes is transferred to a second one of the number of spatial modes via the particular spatial mode, wherein the first one of the number of optical signals is transmitted via the second one of the number of spatial modes.

Distributed spatial mode processing for spatial-mode multiplexed communication systems

A method and system for distributed spatial mode processing is disclosed a number of optical signals are received over an optical link. Each optical signal is received via a respective one of a number of spatial modes of the optical link. The optical link includes a particular spatial mode not used for the receiving. A first one of the number of optical signals received from a first one of the number of spatial modes is transferred to a second one of the number of spatial modes via the particular spatial mode, wherein the first one of the number of optical signals is transmitted via the second one of the number of spatial modes.

A method for modifying the performance of an adaptive equalizer in a receiver is provided. A carrier wave comprising a first polarization state and a second polarization state, wherein there is a correlation between the first polarization state and the second polarization state, is received. The first polarization state and the second polarization state are demultiplexed to generate two respective constellations. A first expected value based on the first constellation, and a second expected value based on the second constellation, are calculated. An adaptive equalizer receives a first and second signals associated with the respective polarization states. The adaptive equalizer generates outputs based on the signals. These outputs are used to generate error values. Feedback is input into the adaptive equalizer, wherein the feedback is based on the error values.

System and methods for adaptive equalization for optical modulation formats

A method and system for distributed spatial mode processing is disclosed where a plurality of optical signals is received via a plurality of spatial modes on a first optical link, spatial mode conversion is performed on the plurality of optical signals to switch the plurality of optical signals to different ones of the plurality of spatial modes and the plurality of optical signals is transmitted via the different ones of the plurality of spatial modes on a second optical link where spatial mode filtering may occur.

A method for modifying the performance of an adaptive equalizer in a receiver is provided. A carrier wave including a first polarization state and a second polarization state, wherein there is a correlation between the first polarization state and the second polarization state, is received. The first polarization state and the second polarization state are demultiplexed to generate two respective constellations. A first expected value based on the first constellation, and a second expected value based on the second constellation, are calculated. An adaptive equalizer receives a first and second signals associated with the respective polarization states. The adaptive equalizer generates outputs based on the signals. These outputs are used to generate error values. Feedback is input into the adaptive equalizer, wherein the feedback is based on the error values.

A fiber optic system includes a transmitter for transmitting high-speed streaming electrical data to a receiver for receiving the high-speed data. In order to transmit multiple channels in the system at high-speeds, an electrical data signal is converted into multiple optical sub-signals. Each of the multiple optical sub-signals are transmitted at the common wavelength on multi-spatial mode media. The receiver receives the multiple optical sub-signals as a multi-spatial mode optical signal and separates the multi-spatial mode optical signal into branch signals having a common wavelength. The receiver mixes each of the branch signals with optical carrier waves having the common wavelength and converts the branch signals into electrical signals. Digital signal processing is used to recover the data sub-signals which are used to recover the original data signal.

Optical networks using multi-spatial mode media

Described herein are systems and methods for enhancing the resolution of an optical time-domain reflectometer ('OTDR'). One embodiment of the disclosure of this application is related to a device, comprising an optical measuring component collecting a first set of measurement data from a forward trace along an optical fiber with the optical measuring device using depolarized light, and a processing component calculating loss along the length of fiber. The optical measuring device further collects a second set of measurement data from a backward trace along the optical fiber with the optical measuring device using depolarized light.

Enhanced optical time-domain reflectometer resolution using depolarization of light source

Systems and methods are described that measure the OSNR of an optical channel. Embodiments provide OSNR measurement methods that distinguish the intensities of the coherent modulated signal from the incoherent noise intensity occupying the same optical band using a calibration factor &#x3b6;.

Calibration factor for interferometric optical signal-to-noise ratio measurement

Interferometric optical signal-to-noise ratio measurement using a calibration factor

Systems and methods are described that derive a relationship between an optical transmitter's extinction ratio (E) and its interferogram wing-to-peak ratio (I). The change in an optical transmitter's Icorrelates with a change in measured E. As the Eof a telecom signal changes, the power of the modulated signal's interferogram wings change. After a relationship between Iand measured Ehas been derived for an optical transmitter, the relationship may be used after deployment to determine an Eby measuring an I.

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Matawan, NJ, United States of America

Lynn Nelson