Infinera Corporation

Sdl Inc.

Spectra Diode Laboratories, Inc.

Jds Uniphase Corporation

Xerox Corporation

Infiriera Corporation

Laserscore, Inc.

Hughes Electronics Corporation

Attotude, Inc.

Jafari, Amir

Osman, Mohamed

Hand, Steven Joseph

Welch, David F.

Wu, Kuang-tsan

David F Welch

Fred A Kish, Jr

Donald R Scifres

Charles H Joyner

Stephen G Grubb

Radhakrishnan L Nagarajan

Vincent G Dominic

Alan C Nilsson

Robert B Taylor

Robert G Waarts

Ting-Kuang Chiang

David G Mehuys

Atul Mathur

Drew Daniel Perkins

Kuang-Tsan Wu

Mark Missey

Richard P Schneider

Steven Joseph Hand

Robert J Lang

Matthew L Mitchell

Steven Sanders

Frank H Peters

Jeffrey Thomas Rahn

Jonas Webjorn

Randall S Geels

Ross A Parke

John G Endriz

Frank Peters

Jo S Major

William Streifer

John Duncan McNicol

Raymond Zanoni

Prasad Paranjape

Richard R Craig

Masaki Kato

Mehrdad Ziari

Edward Everett Sprague

Pierre Mertz

Parthiban Kandappan

Mohamed Osman

Amir Jafari

Marco Sosa

Dirk J Kuizenga

Julian S Osinski

Andrew G Dentai

Stephen O'Brien

Amos A Hardy

Stuart D Elby

Jean-Luc Archambault

Peter Cross

Derek W Nam

William Streifer, Deceased

Kenneth M Dzurko

David Kirtland Fork

Biao Lu

Ross D Bringans

Edward C Vail

Stuart MacCormack

James Richard Dodd, Jr

Jagdeep Singh

Mark Tehmin Yin

Fred A Kish

Sheila K Hurtt

Mark A Brodsky

Damien Lambert

Robert R Taylor

Robert L Taylor

Robert Lg Waarts

Randal A Salvatore

Damien Jean Henri Lambert

Han Henry Sun

Sudipto Chakraborty

David M Pepper

Robert L Thornton

Thomas R O'Meara

Bardia Pezeshki

G A Connell

Ronald Regis Stephens

Jack L Feinberg

Marvin B Klein

Tulasi Veguru

Donald J Pavinski

Alexander Schoenfelder

Paul Morkel

Mats Plantare

John J Kingston

Yong K Yim

Joy Laskar

Robert Grencavich

Donals R Scifres

Vinh D Nguyen

Donald J Pavinski, Jr

Robert L G Waarts

Ramon E Alvarez

Yong Yim

Amos Hardy

Steven G Grubb

Erik P Zucker

A network or system in which a hub or primary node may communicate with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed to receive data carrying optical signals from, and supply data carrying optical signals to, the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, optical splitters/combiners, and optical add/drop multiplexer, for example. Optical subcarriers may be transmitted over such connections, each carrying a data stream. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced. As the bandwidth or capacity requirements of the leaf nodes change, the number of subcarriers, and thus the amount of data provided to each node, may be changed accordingly. Each subcarrier within a dedicated group of subcarriers may carry OAM or control channel information to a corresponding leaf node, and such information may be used by the leaf node to configure the leaf node to have a desired bandwidth or capacity.

Frequency division multiple access optical subcarriers

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for generating, transmitting, directing, receiving, and processing optical subcarriers. In some implementations, a system includes a Tier 1 switch that supplies a plurality of data channels; a transmitter that receives the plurality of data channels, the transmitter including an optical modulator that supplies a plurality of optical subcarriers based on the plurality of data channels; an optical platform that receives the plurality of optical subcarriers, the optical platform having a plurality of outputs, each of which supplying at least one of the plurality of subcarriers; a plurality of receivers, each receiving one or more of the plurality of optical subcarriers and supplying one or more of the plurality of data channels; and a plurality of servers, each of which receiving one or more of the plurality of data channels.

Subcarrier based data center network architecture

Transport networks, network elements, and methods of use are described herein, including a transmitter comprising a client-side input, transmitter circuitry, and antennas. The client-side input is configured to receive baseband signals having client data encoded therein. The transmitter circuitry is configured to receive the baseband signals from the client-side input and generate antenna feed signals based on the baseband signals. The antennas are configured to receive the antenna feed signals from the transmitter circuitry, generate radiated signals based on the antenna feed signals, and couple the radiated signals into a hollow waveguide. Each of the radiated signals is a radiated electromagnetic wave configured for coherent detection and has a frequency in a range between 300 Gigahertz (GHz) and 10 Terahertz (THz).

Fiber-coupled Terahertz transceiver system

A transmitter can include a laser operable to output an optical signal; a digital signal processor operable to receive user data and provide electrical signals based on the data; and a modulator operable to modulate the optical signal to provide optical subcarriers based on the electrical signals. A first one of the subcarriers carriers carries first TDMA encoded information and second TDMA encoded information, such that the first TDMA encoded information is indicative of a first portion of the data and is carried by the first one of the subcarriers during a first time slot, and the second TDMA encoded information is indicative of a second portion of the data and is carried by the first one of the subcarriers during a second time slot. The first TDMA encoded information is associated with a first node remote from the transmitter and the second TDMA encoded information is associated with a second node remote from the transmitter. A second one of the subcarriers carries third information that is not TDMA encoded, the third information being associated with a third node remote from the transmitter. A receiver and system also are described.

Time division multiple access optical subcarriers

Methods, systems, and apparatus for subcarrier modulation with radio frequency inphase-quadrature (IQ) modulators. A system includes a plurality of IQ modulators, each configured to receive an input electrical signal comprising an inphase signal and a quadrature signal, and each configured to modulate the inphase signal and quadrature signal based on one of a plurality of local oscillator signals to output a multiplexed signal. Each of the plurality of local oscillator signals is supplied by a respective one of a plurality of local oscillator circuits. A modulator circuit is configured to modulate a carrier optical signal from a laser having a frequency ωbased on the multiplexed signal to generate a modulated optical signal centered at frequency ωand comprising a plurality of subcarriers. A center frequency of each of the plurality of subcarriers is offset from ωby a frequency of said one of the plurality of local oscillator signals.

Subcarrier modulation with radio frequency (RF) IQ modulators

A hub node may or have a capacity greater than that of associated leaf nodes. Accordingly, inexpensive leaf nodes may be deployed to receive data carrying optical signals from, and supply data carrying optical signals to, the hub node. One or more connections may couple each leaf node to the hub node, each connection including one or more segments of optical fibers, optical amplifiers, optical splitters/combiners, and optical add/drop multiplexer. Optical subcarriers may be transmitted over such connections, each carrying a data stream. The subcarriers may be generated by a combination of a laser and a modulator. As the capacity requirements of the leaf nodes change, the number of subcarriers associated with, and thus the amount of data provided to, each node, may be changed accordingly.

Optical subcarriers may be employed to transmit data in a point-to-multi-point network whereby a hub node including a network switch receives such data from a client and transmits information indicative of such data to multiple leaf or network nodes, where data intended for such leaf node is output. Often the rate at which data is supplied to the hub node is different than the rate at which information indicative of the data is transmitted. Moreover, the client data may have a format that is different than that associated with the transmitted information indicative of the client data. Consistent with the present disclosure, client data is inverse multiplexed to lower data rate streams and then multiplexed to a plurality of inputs, each of which corresponding to a respective optical subcarrier. Information indicative of the data may be allocated to multiple subcarriers, if the a single carrier lacks sufficient capacity or bandwidth to meet the bandwidth requirements of the leaf node. Buffer circuits may also be employed to 'shape' or delay the outputs or flows of the multiplexer so that data is fed, for example, to a transmit portion of chipof the network switch at a uniform rate rather than in non-uniform data bursts, which, under certain circumstances, could exceed the capacity of such transmit portion. In a further example, leaf nodes include circuitry for monitoring the amount of received data, and, if such received exceeds a certain threshold, a request is sent from the leaf node to the hub to transmit data at a rate equal to or substantially equal to the received data rate. As a result, symmetric data flows may be achieved whereby the leaf nodes transmit and receive data at the same or substantially the same rate.

Network switches systems for optical communications networks

Consistent the present disclosure, a network or system is provided in which a hub or primary node may communication with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity that may be greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed that receive data carrying optical signals from and supply data carrying optical signals to the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, and optical add/drop multiplexer, for example. Consistent with an aspect of the present disclosure, optical subcarriers may be transmitted over such connections. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced. In addition, the subcarriers may be employed using multiple access techniques, such as frequency division multiplexing (FDM), code-division multiple access (CDMA), and time-division multiple access so that the primary node can communicate with a relatively large number of secondary nodes. In addition, an out-of-band control channel may be provided to carry OAM information from the primary node to the secondary nodes, as well as from the secondary nodes to the primary nodes.

Code division multiple access optical subcarriers

Growing community of inventors

Menlo Park, CA, United States of America

David F Welch