公开(公告)号：US10763970B2

公开(公告)日：2020-09-01

申请号：US16323304

申请日：2016-08-10

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Fabio Cavaliere ,  Enrico Forestieri

IPC: H04B10/516

Abstract: A first signal is generated from an input signal by a first delay (70), and by low pass filtering (74). A second signal is generated from the input signal and from a second, longer delayed (72), version of the input signal, such that in response to a pulse on the input signal, the second signal has a sequence of two pulses, coinciding respectively with leading and trailing edges of a corresponding pulse on the first signal. If the signals are electrical, they can drive I and Q inputs of an IQ modulator (84, 86). If generated optically, they can be combined directly to produce the encoded optical output signal. By using such delays and filtering to produce these signals, a CAPS-3 encoded optical signal can be simulated, to obtain its chromatic dispersion tolerance advantages with less complex hardware and less power consumption.

公开(公告)号：US10895797B2

公开(公告)日：2021-01-19

申请号：US16302016

申请日：2016-05-25

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Fabio Cavaliere ,  Enrico Forestieri

IPC: G02F1/225 ,  H04L25/49 ,  H04B10/50 ,  G02F1/21

Abstract: Digital data (11) is encoded to a set of five line symbols for optical transmission. The line symbols have amplitude values of 0, ±A1, ±A2, where |A2|>|A1|. A first binary value maps to the line symbols 0 and ±A2 and a second binary value maps to the line symbols ±A1. The amplitude values of the line symbols can be in the ratio A1:A2=1:sqrt(2). At a receiver, the received signal is photodetected to generate an electrical signal which can represent a set of three possible received symbols (RS1, RS2, RS3). Digital data (26) is recovered from the received symbols by comparing the electrical signal with a first amplitude threshold (TH1) and a second amplitude threshold (TH2).

公开(公告)号：US10432316B2

公开(公告)日：2019-10-01

申请号：US15758112

申请日：2015-09-08

Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Inventor： Fabio Cavaliere ,  Antonio Malacarne ,  Enrico Forestieri ,  Marco Secondini ,  Luca Poti

IPC: H04B10/00 ,  H04B10/556 ,  H04B10/516 ,  H04J14/04 ,  H04B10/25 ,  H04B10/50

Abstract: A method of transmitting communications traffic, the method comprising steps of receiving a sequence of communications traffic bits; and mapping the sequence of communications traffic bits onto a respective one of a plurality of transmission symbols for transmission during a symbol time. Each transmission symbol is identified by a respective first symbol identifier indicative of a respective one or more of a plurality, M, of wavelengths for a transmission signal and a respective second symbol identifier indicative of a respective one or more of a plurality, N, of optical fibers on which to transmit the transmission signal.

公开(公告)号：US11677475B2

公开(公告)日：2023-06-13

申请号：US17603247

申请日：2020-03-12

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Tommaso Catuogno ,  Enrico Forestieri ,  Luca Poti ,  Francesco Fresi ,  Fabio Cavaliere ,  Marco Secondini

IPC: H04B10/524 ,  H04B10/54

CPC classification number: H04B10/524 ,  H04B10/541

Abstract: A method (100) of encoding communications traffic bits onto an optical carrier signal in a pulse amplitude modulation, PAM, format. The method comprises: receiving (102) bits to be transmitted; receiving (104) an optical carrier signal comprising optical pulses having an amplitude and respective phases; performing (106) PAM of the optical pulses to encode at least one respective bit in one of a pre-set plurality of amplitudes of a said optical pulse; and performing (108) phase modulation of the optical pulses to encode at least one further respective bit in a phase difference between a said optical pulse and a consecutive optical pulse.

公开(公告)号：US20220182150A1

公开(公告)日：2022-06-09

申请号：US17603247

申请日：2020-03-12

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Tommaso Catuogno ,  Enrico Forestieri ,  Luca Poti ,  Francesco Fresi ,  Fabio Cavaliere ,  Marco Secondini

IPC: H04B10/524 ,  H04B10/54

Abstract: A method (100) of encoding communications traffic bits onto an optical carrier signal in a pulse amplitude modulation, PAM, format. The method comprises: receiving (102) bits to be transmitted; receiving (104) an optical carrier signal comprising optical pulses having an amplitude and respective phases; performing (106) PAM of the optical pulses to encode at least one respective bit in one of a pre-set plurality of amplitudes of a said optical pulse; and performing (108) phase modulation of the optical pulses to encode at least one further respective bit in a phase difference between a said optical pulse and a consecutive optical pulse.

公开(公告)号：US09941963B2

公开(公告)日：2018-04-10

申请号：US15309113

申请日：2014-05-12

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Roberto Magri ,  Enrico Forestieri ,  Marco Secondini ,  Domenico Marsella

IPC: H04B10/12 ,  H04B10/2513 ,  H04B10/2507 ,  H04B10/2531 ,  H04B10/079 ,  H04L25/03

CPC classification number: H04B10/25133 ,  H04B10/07951 ,  H04B10/07955 ,  H04B10/25073 ,  H04B10/2531 ,  H04L25/03191

Abstract: A method (10) of non-linear propagation impairment equalization, the method comprising the steps of: a. receiving (12) communications traffic carried by an optical communications signal transmitted over an optical communications link; b. generating (14) a time dependent filter representation of a nonlinear time-variant impulse response of the inverse of the optical communications link; and c. applying (16) the time dependent filter representation to the received communications traffic to form non-linear propagation impairment equalized communications traffic. An optical communications link nonlinear propagation impairment equalizer and optical communications signal receiver apparatus are also provided.