Cisco Technology, Inc.

Coreoptics, Inc.

Other

Theodor Kupfer

Michael Tittenhofer

James E Whiteaway

Viktor Brauer

Paul Presslein

Thomas Duthel

Juergen Hauenschild

Soeren Gehrke

Claus Dorschky

Markus Danninger

Christian Rainer Raabe

Gilberto Loprieno

Nebojsa Stojanovic

Andreas Bernhard Bisplinghoff

Fabrizio Forghieri

Giacomo Losio

Pierluigi Poggiolini

Jerrold Mark Pianin

Jonas Geyer

Chris Fludger

Vittorio Curri

Andrea Carena

Gabriella Bosco

Jürgen Hauenschild

Soren Gehrke

Antonio Carugati

Andreas Bisplinghoff

Sören Gehrke

Presented herein are a submount architecture for an electro-optical engine, which may be embodied as an apparatus in the form of at least an electro-optical engine and a multimode node, and a method for providing the same. According to at least one example, an apparatus includes a printed circuit board (PCB), a substrate with a finer structuring than the PCB, and electro-optical components. A bottom surface of the substrate is coupled to the PCB and electro-optical components are mounted on a top surface of the substrate. The electro-optical components include one or more optical components arranged to emit optical signals towards and/or receive optical signals from an area above the top surface of the substrate.

Submount architecture for multimode nodes

A method is performed by a host assembly including a controller, a power supply circuit, and a host connector to be connected to an optical module of a particular type among different types of optical modules respectively configured to accept different types of supply voltages. The method includes: when the optical module is connected to the host assembly, identifying a particular type of supply voltage, among the different types of the supply voltages, that the optical module is configured to accept; selecting, among different power modes available to the host assembly that are respectively compatible with the different types of the supply voltages, a particular power mode that is compatible with the particular type of the supply voltage; and operating in the particular power mode to provide the particular type of the supply voltage to the optical module.

Multimode power control scheme for optical module

At a controller of an optical module including optical transmitters and optical receivers coupled to the controller and coupled to first and second optical fibers: responsive to a first command, first configuring the optical module to operate in a normal mode in which the optical module operates at a maximum communication capacity by transmitting and receiving a maximum number of wavelengths, that the optical module is capable of transmitting and receiving, on each of the first optical fiber and the second optical fiber; and responsive to a second command, second configuring the optical module to operate in a backward compatible legacy mode in which the optical module operates at a reduced communication capacity compatible with a legacy optical module by transmitting and receiving a reduced number of wavelengths, that is less than the maximum number of wavelengths, on each of the first optical fiber and the second optical fiber.

Gigabit multimode bidirectional optical module

In one embodiment, a module for plugging into a QSFP-DD (Quad Small Form Factor Pluggable Double Density) cage is provided that has one or more projections for contacting a QSFP-DD optical module in an adjacent QSFP-DD recess of the QSFP-DD cage so as to evacuate heat from, and or provide power to, the QSFP-DD optical module.

QSFP-DD (quad small form factor pluggable-double density) modules and methods therefor

In one embodiment, a pluggable module for insertion into a socket of a network cabinet is disclosed, the pluggable module comprising a body having first and second portions arranged along an axis, wherein the module is arranged for insertion of the first portion into said socket in a direction of insertion along the axis, whereupon the second portion protrudes from said socket along the axis and away from the direction of insertion, and wherein the second portion comprises a first heat sink on a surface of the second portion, wherein the first heat sink comprises a plurality of parallel fins aligned with the axis of insertion.

Network cabinet module

QSFP-DD (quad small form factor pluggable&#x2014;double density) modules and methods therefor

An optical signal is received at a coherent optical receiver. The received optical signal is converted to a first electrical signal and a second electrical signal through a first photodetector and a second photodetector, respectively. The first electrical signal is input into a first single input variable gain amplifier, and the second electrical signal is input into a second single input variable gain amplifier. A gain of at least one of the first single input variable gain amplifier or the second single input variable gain amplifier is controlled to balance the output of the first single input variable gain amplifier and the output of the second single input variable gain amplifier. The output of the first single input variable gain amplifier and the output of the second single input variable gain amplifier are input into a differential amplifier. A receiver output is obtained at an output of the differential amplifier.

Common mode rejection ratio control for coherent optical receivers

A method for transmitting a coherent optical data signal includes receiving a data signal from an interface, and encoding the data signal with a forward error correcting (FEC) encoder according to a mix of modulation formats. The FEC encoder generates an FEC encoded signal which is used to generate modulation symbols according to the modulation formats. The FEC encoded signal of modulation symbols is spectrally shaped to generate a shaped signal, and pre-distorted before transmission. The shaped signal is pre-distorted by adding a predetermined amount of chromatic dispersion to generate a smoothed signal, and the smoothed signal is transmitted according to the modulation formats.

Optimization of optical transmission capacity

A system configured to maintain a consistent local-oscillator-power-to-primary-signal-power ratio (LO/SIG ratio). The system may be configured to: receive the voltages for a plurality of optical signal components split from a combined SIG and LO signal; determine individual factors for the plurality of optical signal components; average the individual factors; determine whether the averaged output is less than an existing minimum reference value for a variable optical attenuator; determine whether the averaged output is greater than an existing maximum reference value for the variable optical attenuator; change the existing minimum reference value to a new value associated with the averaged output, due to determining that the averaged output is less than the existing minimum reference value; change the existing maximum reference value to a new value associated with the averaged output, due to determining that the averaged output is greater than the existing maximum reference value; and change a new value associated with the averaged output to be transmitted to the variable optical attenuator.

Optical communication reception system

Using polarization modulation techniques to simultaneously transmit two different data streams (formatted according to two different protocols) over a single optical wavelength. A first data stream that is encapsulated for transport using a first transport protocol, and a second data stream that is encapsulated for transport using a second transport protocol are received. The first data stream is modulated on a wavelength with a first polarization mode of a polarization division modulation scheme to produce a first modulated data stream and the second data stream is modulated on the wavelength with a second polarization mode of the polarization division multiplex transmission scheme to produce a second modulated data stream having the second polarization mode. The second polarization mode is orthogonal to the first polarization mode. The first and second data streams are combined onto a single wavelength for transmission over a single optical fiber using a polarization beam combiner.

Multiprotocol transport using polarization division multiplexing

Carrier phase estimation techniques are provided for processing a received optical signal having a carrier modulated according to a modulation scheme. First and second carrier phase estimation operations are performed on a digital signal derived from an optical carrier obtained from the received optical signal using coherent optical reception. The first carrier phase estimation operation tracks relatively fast phase variations of the optical carrier of the received optical signal to produce a first carrier phase estimation and the second carrier phase estimation operation tracks relatively slow phase variations of the optical carrier of the received optical signal to produce a second carrier phase estimation. A difference between the first and second carrier phase estimations is computed. Occurrence of a cycle slip is determined when the difference is greater than a threshold. A correction is applied to the first carrier phase estimation when the low pass filtered difference exceeds the threshold.

Cycle slip reduction in coherent optical communications

This invention relates to a receiver circuit which comprises an equalizer () and an error decorrelator (). The error decorrelator being configured for changing () the position of symbols. The invention further relates to a corresponding method. This invention finally relates to an interleaving or deinterleaving method which comprises selecting a first number of symbols () within a stream of digital data () thereby obtaining selected symbols. The method further comprises exchanging () the position of at least half of said first number of symbols of said selected symbols with the position of other symbols from said selected symbols. The invention further relates to an interleaving or deinterleaving circuit.

Modification of error statistics behind equalizer to improve inter-working with different FEC codes

A system configured to maintain a consistent local-oscillator-power-to-primary-signal-power ratio (LO/SIG ratio). The system may be configured to: receive the voltages for a plurality of optical signal components split from a combined SIG and LO signal; determine individual factors for the plurality of optical signal components; average the individual factors; determine whether the averaged output is less than a minimum reference value for a variable optical attenuator; determine whether the averaged output is greater than a maximum reference value for the variable optical attenuator; change a value associated with the averaged output to the minimum reference value, due to determining that the averaged output is less than the minimum reference value; change a value associated with the averaged output to the maximum reference value, due to determining that the averaged output is greater than the maximum reference value; and change a new value associated with the averaged output to be transmitted to the variable optical attenuator.

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Feucht, Germany

Theodor Kupfer