公开(公告)号：US20040170226A1

公开(公告)日：2004-09-02

申请号：US10713400

申请日：2003-11-14

Inventor： Oscar E. Agazzi

IPC: H04K001/10 ,  H04L027/28 ,  G02F002/00

CPC classification number: H04L1/006 ,  H04B10/2575 ,  H04B10/2581 ,  H04B10/504 ,  H04B10/5055 ,  H04B10/541 ,  H04B10/548 ,  H04J14/02 ,  H04L25/0204 ,  H04L25/0224 ,  H04L27/2637 ,  H04L27/2653 ,  H04L27/2697 ,  H04L27/34

Abstract: Multi-carrier modulation fiber optic systems constructed using a series of electrical carriers, modulating the data on the electrical carriers and combining the carriers to form a wideband signal. The wideband signal can then be intensity modulated on a laser and coupled to a fiber optic channel. A receiver may then receive the laser signal from the fiber optic channel and convert it into an electrical signal. Multi-carrier modulation may be applied to existing fiber channels, which may be of lower quality. Existing fiber channels may have characteristics which prevent or restrict the transmission of data using intensity modulation at certain frequencies. An adaptive multi-carrier modulation transmitter may characterize an existing fiber optic channel and ascertain the overall characteristics of the channel. The transmitter and receiver can then be configured to use various bandwidths and various modulations in order to match the transfer characteristic of the fiber channel. A series of adaptive multi-carrier modulation transmitters and receivers can be integrated on a single integrated circuit. If multiple adaptive receivers and transmitters are integrated on a single integrated circuit, they may be used to upgrade existing networks by adding different wavelength lasers for the transmission of data in order to achieve any capacity desired. Each receiver and transmitter may characterize the fiber for its particular wavelength laser and may configure the modulation and bandpass to the fiber's characteristics.

Abstract translation: 使用一系列电载体构建的多载波调制光纤系统，调制电载波上的数据并组合载波以形成宽带信号。 然后可以在激光器上对宽带信号进行强度调制并耦合到光纤通道。 然后，接收器可以从光纤通道接收激光信号并将其转换为电信号。 多载波调制可以应用于可能具有较低质量的现有光纤信道。 现有的光纤通道可以具有在某些频率下使用强度调制来防止或限制数据传输的特性。 自适应多载波调制发射机可以表征现有光纤信道并确定信道的总体特性。 然后可以将发射机和接收机配置为使用各种带宽和各种调制，以便匹配光纤信道的传输特性。 一系列自适应多载波调制发射机和接收机可集成在单个集成电路上。 如果多个自适应接收机和发射机集成在单个集成电路上，则它们可用于通过为数据传输添加不同波长的激光器来升级现有网络，以实现所需的任何容量。 每个接收器和发射器可以表征其特定波长激光器的光纤，并且可以配置对光纤的特性的调制和带通。

公开(公告)号：US20040151507A1

公开(公告)日：2004-08-05

申请号：US10713449

申请日：2003-11-14

Inventor： Oscar E. Agazzi

IPC: H04B010/12

CPC classification number: H04L1/006 ,  H04B10/2575 ,  H04B10/2581 ,  H04B10/504 ,  H04B10/5055 ,  H04B10/541 ,  H04B10/548 ,  H04J14/02 ,  H04L25/0204 ,  H04L25/0224 ,  H04L27/2637 ,  H04L27/2653 ,  H04L27/2697 ,  H04L27/34

Abstract: Multi-carrier modulation fiber optic systems constructed using a series of electrical carriers, modulating the data on the electrical carriers and combining the carriers to form a wideband signal. The wideband signal can then be intensity modulated on a laser and coupled to a fiber optic channel. A receiver may then receive the laser signal from the fiber optic channel and convert it into an electrical signal. Multi-carrier modulation may be applied to existing fiber channels, which may be of lower quality. Existing fiber channels may have characteristics which prevent or restrict the transmission of data using intensity modulation at certain frequencies. An adaptive multi-carrier modulation transmitter may characterize an existing fiber optic channel and ascertain the overall characteristics of the channel. The transmitter and receiver can then be configured to use various bandwidths and various modulations in order to match the transfer characteristic of the fiber channel. A series of adaptive multi-carrier modulation transmitters and receivers can be integrated on a single integrated circuit. If multiple adaptive receivers and transmitters are integrated on a single integrated circuit, they may be used to upgrade existing networks by adding different wavelength lasers for the transmission of data in order to achieve any capacity desired. Each receiver and transmitter may characterize the fiber for its particular wavelength laser and may configure the modulation and bandpass to the fiber's characteristics.

公开(公告)号：US20020176140A1

公开(公告)日：2002-11-28

申请号：US09852556

申请日：2001-05-10

Inventor： Richard L. Davis

IPC: H04B010/00 ,  H04B010/12

CPC classification number: H04B10/505 ,  H04B10/5055

Abstract: A photonic arbitrary waveform modem utilizes a bipolar coding scheme. The bipolar coding scheme includes an arbitrary waveform modem which includes a plurality of tapped delay lines and is implemented by partitioning each optical frequency chip into positive and negative segments. Signals are decoded by effectively multiplying the transmit and receive code vectors and individually summing the positive and negative tap weights. The positive and negative tap weights are differenced to recreate the transmitted signal. The bipolar coding scheme allows for the use of truly orthogonal codes which decreases the interference and reduces the probability of detection.

Abstract translation: 光子任意波形调制解调器利用双极编码方案。 双极性编码方案包括任意波形调制解调器，其包括多个抽头延迟线，并且通过将每个光频率芯片分成正和负片段来实现。 信号通过有效地乘以发送和接收码矢量并对正和负抽头权重进行单独加法来解码。 正和负抽头权重不同以重新发送传输的信号。 双极编码方案允许使用真正的正交码，其减少干扰并降低检测的概率。

公开(公告)号：US20020033984A1

公开(公告)日：2002-03-21

申请号：US09939716

申请日：2001-08-28

Inventor： Kazushige Yonenaga ,  Yutaka Miyamoto ,  Akihiko Matsuura

IPC: H04B010/04

CPC classification number: H04B10/5167 ,  H04B10/505 ,  H04B10/5055

Abstract: TITLE OF THE INVENTION Optical Transmission System An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal (10) for accepting an electrical binary signal, an amplifier (12) for amplifying said electrical binary signal to the level requested for operating an electrical-optical converter (16) such as a Mach Zehnder light modulator, a bandwidth restriction means (14) which is for instance a low pass filter for restricting bandwidth of said electrical binary signal, and an electrical-optical conversion means (16) such as a Mach Zehnder light modulator for converting electrical signal to optical signal. Because of the location of the low pass filter (14) between an output of the amplifier (12) and the Mach Zehnder light modulator (16), the amplifier (12) may operate in saturation region to provide high level output signal enough for operating the Mach Zehnder light modulator, and a signal shaped by the low pass filter (14) is applied to the Mach Zehnder light modulator (16) with excellent waveform. The invention is useful for long distance, large capacity and low cost optical transmission system.

Abstract translation: 光传输系统提供带宽限制光信号的光传输系统包括用于接收电二进制信号的输入端（10），用于将所述电二进制信号放大到用于操作电二进制信号所要求的电平的放大器（12） 诸如马赫曾德尔光调制器的光学转换器（16），例如用于限制所述电二进制信号的带宽的低通滤波器的带宽限制装置（14），以及电光转换装置（16），诸如 用于将电信号转换为光信号的马赫曾德尔光调制器。 由于放大器（12）的输出端与马赫曾德尔光调制器（16）之间的低通滤波器（14）的位置，放大器（12）可以在饱和区域中工作，以提供足够的高电平输出信号 马赫曾德尔光调制器和由低通滤波器（14）成形的信号以优异的波形施加到马赫曾德尔光调制器（16）。 本发明对于长距离，大容量和低成本的光传输系统是有用的。

公开(公告)号：US20240283542A1

公开(公告)日：2024-08-22

申请号：US18570802

申请日：2022-05-20

Applicant: RHEINISCH-WESTFALISCHE TECHNISCHE HOCHSCHULE (RWTH) AACHEN

Inventor： Oner Hanay ,  Erkan Bayram ,  Renato Negra

IPC: H04B10/556 ,  H04B10/50

CPC classification number: H04B10/556 ,  H04B10/5053 ,  H04B10/5055 ,  H04B10/506

Abstract: A transmitting device for transmitting a broadband optical transmission signal via an optical waveguide, having an electronic subsystem and an optical subsystem, the optical subsystem has N electro-optic modulators for providing N optical signal components, where N is a number greater than 1, the electronic subsystem is configured to transform a baseband signal by a Fourier transform, or a discrete Fourier transform, into a frequency spectrum containing N digital coefficient signals, and to provide, on a basis of the N digital coefficient signals, N analog coefficient signals, and the electro-optic modulators of the optical subsystem are configured to be driven each by one of the N analog coefficient signals.

公开(公告)号：US11804906B2

公开(公告)日：2023-10-31

申请号：US17505817

申请日：2021-10-20

Applicant: X DEVELOPMENT LLC

Inventor： Baris Ibrahim Erkmen ,  Devin Brinkley ,  Paul Epp ,  John Moody

IPC: H04B10/50 ,  H04B10/548

CPC classification number: H04B10/5053 ,  H04B10/5051 ,  H04B10/5055 ,  H04B10/548

Abstract: A system includes a transmitter configured to output an optical signal. The transmitter includes a seed laser, an optical array including a plurality of array elements, and a plurality of phase shifters in a multi-layer arrangement. The multi-layer arrangement includes a plurality of layers between the seed laser and the optical array, wherein a first layer of the plurality of layers transmits light to a second layer of the plurality of layers. The first layer has fewer phase shifters than the second layer. The multi-layer arrangement also includes a plurality of branches wherein each branch includes a phase shifter from each of the plurality of layers connected in series between the seed laser and one of the plurality of array elements. Each phase shifter is configured to shift the optical signal incrementally to amass a total phase shift for each of the plurality of array elements.

公开(公告)号：US09929812B2

公开(公告)日：2018-03-27

申请号：US15225593

申请日：2016-08-01

Applicant: QUALCOMM Incorporated

Inventor： Alexandros Manolakos ,  June Namgoong ,  Raghuraman Krishnamoorthi ,  Jing Jiang ,  Joseph Binamira Soriaga ,  Tingfang Ji ,  Krishna Kiran Mukkavilli

IPC: H04B10/50 ,  H04L25/02 ,  H04B7/06 ,  H04W72/04 ,  H04L5/00 ,  H04L5/14 ,  H04L12/26 ,  H04B7/0456 ,  H04W88/02

CPC classification number: H04B10/5055 ,  H04B7/0456 ,  H04B7/0639 ,  H04B7/0691 ,  H04L5/0051 ,  H04L5/14 ,  H04L25/0202 ,  H04L43/16 ,  H04W72/042 ,  H04W72/0453 ,  H04W88/02

Abstract: Methods, systems, and devices for wireless communication are described. One method includes identifying a plurality of intermediate precoders corresponding to a plurality of tone subsets. The plurality of intermediate precoders define a plurality of vectors across the plurality of tone subsets. The method further includes selecting, for each vector of the plurality of vectors, a subset of non-frequency domain components of the vector, such as time-domain components; modifying the plurality of intermediate precoders to a plurality of smoothed precoders based at least in part on the selected subset of non-frequency domain components for each vector; and precoding a plurality of transmit streams using the plurality of smoothed precoders. The plurality of smoothed precoders is smoothed in a frequency domain compared to the plurality of intermediate precoders. Smoothing precoders may enable application of wideband channel estimation techniques using user equipment (UE)-specific reference signals.

公开(公告)号：US20170250756A1

公开(公告)日：2017-08-31

申请号：US15593805

申请日：2017-05-12

Applicant: Ciena Corporation

Inventor： David KRAUSE ,  Charles LAPERLE ,  Kim B. ROBERTS

IPC: H04B10/516 ,  H04L27/26 ,  H04B10/50

CPC classification number: H04B10/516 ,  H04B10/5055 ,  H04L27/2627

Abstract: A high speed signal generator comprises a digital signal processing (DSP) block configured to process an input digital signal to generate in parallel a first digital sub-band signal having frequency components within a first spectral range and a second digital sub-band signal having frequency components within the first spectral range. A first Digital-to-Analog Converter (DAC) is configured to process the first digital sub-band signal to generate a first analog sub-band signal and a second DAC is configured to process the second digital sub-band signal to generate a second analog sub-band signal. A combiner is to combine the first analog sub-band signal and the second analog sub-band signal to generate an output analog signal having frequency components covering a substantially continuous spectral range from a lower frequency f1 to a higher frequency f2. The substantially continuous spectral range is substantially wider than a width of the first spectral range, and the lower frequency f1 is less than or equal to one-third of the higher frequency f2.

公开(公告)号：US20170163318A1

公开(公告)日：2017-06-08

申请号：US15325069

申请日：2014-07-24

Applicant: LG ELECTRONICS INC.

Inventor： Ilmu BYUN ,  Hyunsoo KO ,  Kungmin PARK ,  Heejeong CHO ,  Hyeyoung CHOI

IPC: H04B7/0417 ,  G01S3/72 ,  H04B10/50 ,  H04B7/0452 ,  H04B7/06

CPC classification number: H04B7/0417 ,  G01S3/72 ,  H04B7/0452 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0695 ,  H04B10/5055

Abstract: Provided are a method and an apparatus for generating and transmitting feedback signals for a plurality of reference signals having different directionality, in a wireless communication system. A terminal may receive the plurality of reference signals having different directionality, and transmit, to a transmission end, a feedback signal including a beam index which indicates one of the plurality of reference signals.

公开(公告)号：US09485032B2

公开(公告)日：2016-11-01

申请号：US14530571

申请日：2014-10-31

Applicant: Hitachi, Ltd.

Inventor： Yuki Wakayama ,  Nobuhiko Kikuchi

IPC: H04B10/588 ,  H04B10/50

CPC classification number: H04B10/588 ,  H04B10/5053 ,  H04B10/5055

Abstract: An optical multilevel transmitter includes a semiconductor quadrature optical modulator configured to separately modulate and output in-phase and quadrature electric field components and a semiconductor nonlinear characteristic compensation circuit configured to generate, from in-phase and quadrature drive signals to be inputted to the semiconductor quadrature optical modulator, two signals for correcting each other and to add the two correcting signals to the corresponding drive signals.

Abstract translation: 光学多电平发射机包括：半导体正交光调制器，被配置为分别调制和输出同相和正交电场分量;以及半导体非线性特性补偿电路，其被配置为从同相和正交驱动信号中产生输入到半导体正交 光调制器，用于彼此校正的两个信号，并将两个校正信号相加到相应的驱动信号。