Patent
Apparatus and methods for digital signal constellation transformation
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TLDR
In this paper, an integrated circuit includes an analog front-end that converts an analog signal vector representing an optical signal into digital signal vector, and a digital signal processing circuit that processes the digital signal vectors to recover data from the optical signal.Abstract:
Apparatus and method for digital signal constellation transformation are provided herein. In certain configurations, an integrated circuit includes an analog front-end that converts an analog signal vector representing an optical signal into a digital signal vector, and a digital signal processing circuit that processes the digital signal vector to recover data from the optical signal. The digital signal processing circuit generates signal data representing a signal constellation of the digital signal vector. The digital signal processing circuit includes an adaptive gain equalizer that compensates the signal data for distortion of the signal constellation arising from biasing errors of optical modulators used to transmit the optical signal.read more
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References
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Patent
Adaptive equalization in coherent fiber optic communication
TL;DR: In this paper, a coefficient generator generates filter coefficients using an error vector and input samples, and a filter stage generates equalized samples from input samples using the filter coefficients, where the received samples are provided by a receiver front end in an optical transmission channel carrying transmitted symbols.
Patent
Compensating impairments of optical channel using adaptive equalization
TL;DR: In this article, an adaptive equalizer has been proposed to compensate the optical channel impairments of a modulated optical carrier transmitted through an optical channel with impairments, and an adaptive signal processor is used to generate an equalized output, a decision and an error.
Patent
Coherent transceiver architecture
Oscar E. Agazzi,Diego Ernesto Crivelli,Paul Voois,Ramiro Rogelio Lopez,Jorge M. Finochietto,Norman L. Swenson,Mario R. Hueda,Hugo Santiago Carrer,Vadim Gutnik,Adrián Ulises Morales,Martin Ignacio del Barco,Martin Carlos Asinari,Federico Nicolas Paredes,Alfredo Taddei,Mauro Marcelo Bruni,Damian A. Morero,Facundo Ramos,María Laura Ferster,Elvio Adrian Serrano,Pablo Gustavo Quiroga,Roman Arenas,Matias German Schnidrig,Alejandro Javier Schwoykoski +22 more
TL;DR: In this article, a coherent receiver comprises an ingress signal path and clock and timing circuitry, which can operate in a plurality of programmable operating modes to accommodate different modulation/de-modulation schemes, error correction code schemes, framing/mapping protocols and other programmable features.
Journal ArticleDOI
Auto Bias Control Technique Based on Asymmetric Bias Dithering for Optical QPSK Modulation
TL;DR: In this article, a simple and highly sensitive auto bias control (ABC) technique based on asymmetric bias dithering for optical quadrature phase shift keying (QPSK) modulation and QPSK variants is described.
Patent
System and method for coherent detection of optical signals
TL;DR: In this article, an optical communication system (100, 2300) comprises at least a transmitter (110) apt to emit a differential phase shift keying (DPSK) optical signal having a bit-rate equal to R, at least an optical link (130) optically connecting the transmitter and the receiving system for transmitting the DPSK optical signal from the transmitter to the receiving systems, wherein the receiving device comprises a coherent optical receiving device (1205), apt to coherently receive the propagated DPSK signal and to emit at least one electrical signal (I)