Acacia Communications, Inc.

Cisco Technology, Inc.

Christian Rasmussen

Mehmet Aydinlik

Jonas Geyer

Seo Yeon Park

Mehrdad Givehchi

Ian Juso Dedic

Hongbin Zhang

Benny P Mikkelsen

Timo Pfau

Peijun Shan

Fan Mo

Sameep Dave

A method, system, and apparatus for a coherent optical breakout; wherein the optical breakout has a laser; wherein the coherent optical breakout has a set of optical connections; wherein the set has at least two optical connections; wherein the coherent optical breakout enables coherent optical communication of X Gbs across each of the set of optical connections.

Coherent optical breakout

A CMOS integrated circuit comprising digital-to-analogue converters (DACs), analogue-to-digital converters (ADCs), a digital signal processor (DSP), on-chip switching, an on-chip processor; and logic enabling to receive data from data sources in a 5G network, combine the data from the data sources into a single data stream, encode the single data stream using the DSP, and cause the encoded single data stream to be transmitted to another device in the 5G network.

CMOS circuit

In a first embodiment, a method and apparatus for encoding a first spectral efficiency into a second spectral efficiency; wherein the second spectral efficiency has a higher order than the first spectral efficiency. In a second embodiment, a method and apparatus for achieving at least two spectral efficiencies using a single type of modulation.

Encoding a first modulation type with a first spectral efficiency into a second modulation type capable of having a second spectral efficiency

In a first embodiment, method and apparatus for encoding a first spectral efficiency into a second spectral efficiency; wherein the second spectral efficiency has a higher order than the first spectral efficiency. In a second embodiment, a method and apparatus for achieving at least two spectral efficiencies using a single type of modulation.

A method, system, and apparatus for encoding a data for transmission across a communication link, the comprising encoding the data into a constellation; wherein the constellation is of a power 2; wherein n is an odd number; wherein encoding the constellation creates outer constellation points forming a square at an edge of the constellation.

Geometrically shaping QAM modulation

Disclosed are bias control methods for Mach-Zehnder modulators for the generation of optical QAM signals while ensuring correct I/Q polarity of the generated optical QAM signal. One exemplary method involves temporarily offsetting I and Q biases from ideal transmission null bias points while another illustrative method temporarily makes I and Q data streams identical.

Bias control of nested mach-zehnder modulators for the generation of optical QAM signals

Disclosed are methods for monitoring and measuring Optical Signal-To-Noise Ratios in optical communications systems. One exemplary method involves intentionally inserting zero power symbols into an optical signal stream such that those periods of time in which only zero power symbols are transmitted may be detected and compared with periods of time in which signals modulated with information including both signal and noise are detected such that the OSNR may be determined.

Optical signal-to-noise ratio (OSNR) monitoring and measurement in optical communications systems

Bias control of nested Mach-Zehnder modulators for the generation of optical QAM signals

Optical signal-to-noise ratio (OSNR) monitoring and measurement in optical communications sytems

Disclosed herein are methods, structures, and devices that provide multi-range frequency domain compensation of chromatic dispersion within optical transmission systems that offer significant operational power savings. More specifically, a method of operating frequency domain filtering structures and circuits including FFT, frequency-domain filter multiplication and iFFT functions at a lower duty cycle for shorter overlap such that significant power savings is realized.

Multi-range frequency-domain compensation of chromatic dispersion

Soft bit metric generation computational complexity can be reduced by identifying and utilizing only the dominant terms in a reliability calculation such as a logarithmic likelihood ratio (LLR). The dominant terms are those terms for which the signs of the x and y components match those of channel outputs of the channel outputs. One technique for identifying the dominant terms is by determining the most likely transitions from two consecutive channel output samples Values for the dominant terms can be estimated by either the joint reliability of two consecutive samples of the in-phase component (x,x) or by the joint reliability of two consecutive samples of the quadrature components (y,y).

Growing community of inventors

Kongens Lyngby, Denmark

Christian Rasmussen