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公开(公告)号：US12105397B2
公开(公告)日：2024-10-01
申请号：US17514083
申请日：2021-10-29
Applicant: Hitachi, Ltd.
Inventor： Shinichi Saito
CPC classification number: G02F1/212 , G02F1/2252 , H01S3/06712 , H04B10/613
Abstract: An optical modulator includes first and second waveguides; a first phase shifter provided in at least one of the first and second waveguides and configured to control a phase of the laser beam; a first optical element configured to combine the laser beam propagating through the first waveguide and the laser beam propagating through the second waveguide and separate the combined laser beam into two laser beams; a third (fourth) waveguide on which one (the other) of the laser beams separated by the first optical element is incident; a second phase shifter provided in at least one of the third and fourth waveguides and configured to control a phase of the laser beam; and a second optical element configured to combine the laser beam propagating through the third waveguide and the laser beam propagating through the fourth waveguide and emit the laser beam in the superposition state.
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2.发明公开公开(公告)号：US20240305383A1
公开(公告)日：2024-09-12
申请号：US18318103
申请日：2023-05-16
Applicant: LUMENTUM TECHNOLOGY UK LIMITED
Inventor： Shibnath PATHAK , Amit MIZRAHI
IPC: H04B10/61
CPC classification number: H04B10/6165 , H04B10/613 , H04B10/615
Abstract: An optical coherent receiver includes a 90-degree optical hybrid configured to receive an input signal and a reference signal, and mix the input signal with four quadrature states associated with the reference signal to generate four output signals. The 90-degree optical hybrid includes a plurality of 3-dB couplers; and a plurality of optical waveguides, wherein each optical waveguide of the plurality of optical waveguides couples two respective 3-dB couplers of the plurality of 3-dB couplers, and wherein each optical waveguide of the plurality of optical waveguides has a same optical path length. Each optical waveguide of the plurality of optical waveguides is dimensioned according to a figure of merit (FoM) to reduce a phase error.
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公开(公告)号：US20240267129A1
公开(公告)日：2024-08-08
申请号：US18565433
申请日：2021-06-08
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Masanori NAKAMURA , Takayuki KOBAYASHI , Yoshiaki KISAKA , Yutaka MIYAMOTO
IPC: H04B10/61
CPC classification number: H04B10/6161 , H04B10/613
Abstract: A receiver convolves an impulse response for compensating for frequency characteristics and a complex impulse response for wavelength dispersion compensation with each of a real component and an imaginary component of each polarized wave of a reception signal. For each polarized wave, the receiver performs complex signal processing of multiplying the imaginary component by the imaginary unit, then branching the resulting component, and adding one imaginary component to the real component. For each polarized wave, the receiver uses, as input signals, the real component and the imaginary component of each polarized wave after complex signal processing and the phase conjugates of them. For each polarized wave, the receiver adds a signal obtained by a process in which each of the real component and the imaginary component of each polarized wave is multiplied by a complex impulse response, the resulting components are added, and a phase rotation is applied and a signal obtained by a process in which each of the phase conjugate of the real component and the phase conjugate of the imaginary component of each polarized wave is multiplied by a complex impulse response, the resulting components are added, and an opposite phase rotation is applied, and adds a transmission data bias correction signal.
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公开(公告)号：US11881899B1
公开(公告)日：2024-01-23
申请号：US17827581
申请日：2022-05-27
Applicant: CABLE TELEVISION LABORATORIES, INC.
Inventor： Haipeng Zhang , Mu Xu , Zhensheng Jia , Luis Alberto Campos
CPC classification number: H04B10/6165 , H04B10/613 , H04L25/4917
Abstract: A receiver is provided for processing an input signal from a communication network. The receiver includes a processor and a memory configured to store computer executable instructions, which, when executed by the processor, cause the processor to (i) receive an input data signal including digital bit information, (ii) code the input data signal into a plurality of multi-level symbols, (iii) map the plurality of multi-level symbols into a plurality of constellation points in the phase domain, (iv) execute a first phase recovery subprocess on the plurality of constellation points to recover a first carrier phase of the input signal, (v) implement a Gaussian mixture model (GMM) on the recovered first carrier phase to generate an enhanced recovered carrier phase, and (vi) process the enhanced recovered carrier phase with a second phase recovery subprocess to reduce distortion from the input signal.
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公开(公告)号：US20190199443A1
公开(公告)日：2019-06-27
申请号：US16293324
申请日：2019-03-05
Applicant: Huawei Technologies Co., Ltd.
Inventor： Mahdi Zamani , Jeebak Mitra , Hossein Najafi , Zhuhong Zhang , Chuandong Li
IPC: H04B10/61
CPC classification number: H04B10/616 , H04B10/548 , H04B10/5561 , H04B10/613 , H04B10/614
Abstract: Aspects of the present disclosure are directed in part to a receiver DSP unit including an equalization module. The equalization module includes a trellis-based equalization module that may utilize multiple trellis-based processors (TBP), which can each be individually adaptively configured for performing a trellis-based equalization. The design of the TBPs allows them to be configured for compensating a residual Inter-Symbol Interference (ISI) as well as compensating a residual Phase Noise (PN). ISI is an example of an additive impairment and PN is an example of a multiplicative impairment that communication systems, particularly high speed transmission systems such as coherent optical systems, can suffer from.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20180219632A1
公开(公告)日：2018-08-02
申请号：US15741851
申请日：2015-11-24
Applicant: Mitsubishi Electric Corporation
Inventor： Tsuyoshi YOSHIDA
IPC: H04B10/516 , H04J14/06 , H04B10/556 , H04B10/54 , H04B10/61
CPC classification number: H04B10/5161 , H04B10/29 , H04B10/40 , H04B10/541 , H04B10/5561 , H04B10/612 , H04B10/613 , H04B10/614 , H04B10/616 , H04J14/06
Abstract: An optical relay apparatus includes a first signal converting unit that converts a received optical signal into an electric signal and demodulates and outputs the electric signal and modulates an input electric signal in a first modulation scheme, converts the electric signal into an optical signal, and transmits the optical signal and a second signal converting unit that modulates the electric signal output from the first signal converting unit in a second modulation scheme, converts the electric signal into an optical signal, and transmits the optical signal and converts a received optical signal into an electric signal, demodulates the electric signal, and outputs the electric signal as an electric signal input to the first signal converting unit.
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公开(公告)号：US20180191447A1
公开(公告)日：2018-07-05
申请号：US15906514
申请日：2018-02-27
Applicant: Huawei Technologies Co., Ltd.
Inventor： Enbo ZHOU , Yuanjun LIANG , Tianjian ZUO , Liang ZHANG
IPC: H04B10/61
CPC classification number: H04B10/613 , H04B10/5053 , H04B10/61 , H04B10/616 , H04B10/6165 , H04J14/06
Abstract: An optical signal processing method and a coherent receiver, wherein an in-phase signal XI in a first polarization direction and an in-phase signal YI in a second polarization direction are added up to obtain a signal I; a quadrature signal XQ in the first polarization direction and a quadrature signal YQ in the second polarization direction are added up to obtain a signal Q; and quantization, combination, and digital signal processing are performed on the I and the Q. After summation, two signals need to be quantized. Therefore, a quantity of ADCs is reduced by half. In addition, because power consumption of a summation component is less than that of an ADS, power consumption of optical signal processing can be reduced. In addition, because there is a preset value, the summation may be performed after phase-inversion is performed on one analog signal, thereby avoiding a signal loss caused by the summation.
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公开(公告)号：US09906357B2
公开(公告)日：2018-02-27
申请号：US15369211
申请日：2016-12-05
Inventor： Stanley Johnson , Milorad Cvijetic
CPC classification number: H04L7/0075 , H04B10/613 , H04B10/616 , H04B10/6161 , H04L5/0007
Abstract: An optical receiver includes a detector and frame synchronizer. The detector receives an optical OFDM bit stream having a plurality of frames. Each frame has an in-phase and quadrature phase component. Each component has an OFDM symbol-bearing data payload and a synchronization header. The synchronization header includes a single synchronization pulse. The frame synchronizer detects the synchronization header on each phase component. The frame synchronizer includes first and second pairs of digital comparators for each of the in-phase and quadrature phase components. The first and second pairs of digital comparators associated with each phase component establishes different and adjustable threshold windows that is symmetric about a zero amplitude of the synchronization pulse of the respective phase component. Each frame is synchronized when the synchronization pulse respectively associated therewith is detected as having an amplitude extending beyond at least one of the windows established for one of the phase components.
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公开(公告)号：US09647769B2
公开(公告)日：2017-05-09
申请号：US15078189
申请日：2016-03-23
Applicant: Ciena Corporation
Inventor： Shahab Oveis Gharan , Kim B. Roberts , Mahmoud Taherzadehboroujeni
CPC classification number: H04B10/695 , H04B10/612 , H04B10/613 , H04B10/614 , H04B10/616 , H04B10/697 , H04L1/0054
Abstract: In a coherent receiver of an optical communication system, a method of processing a detected symbol estimate to determine a most likely value of a corresponding transmitted data word, the transmitted data word comprising one or more data bits encoded in a transmitter using a predetermined constellation of at least two symbols. A set of two or more virtual constellation points are define in a decision region corresponding to a possible value of the data word. The detected symbol estimate is processed to find a most likely virtual constellation point given the detected symbol estimate. The most likely value of the corresponding transmitted data word is determined based on the most likely virtual constellation point.
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10.发明授权公开(公告)号：US09564968B2
公开(公告)日：2017-02-07
申请号：US14692583
申请日：2015-04-21
Applicant: LGS INNOVATIONS LLC
Inventor： Young-kai Chen , Noriaki Kaneda , Alex Pidwerbetsky
IPC: H04B10/00 , H04B10/112 , H04B10/61
CPC classification number: H04B10/1121 , H04B10/613
Abstract: The present application is directed an optical gyroscope. The optical gyroscope includes a substrate including a first and a second waveguide disposed thereon. One or both of the waveguides may be doped with a rare-earth material. A crossing element is disposed between the first and the second waveguides to form a substantially orthogonal connection therebetween. The application is also directed to a system including an optical gyroscope. The application is further directed to a method of observing characteristics of the optical gyroscope.
Abstract translation: 本申请涉及光学陀螺仪。 光学陀螺仪包括其上设置有第一和第二波导的基板。 一个或两个波导可以掺杂有稀土材料。 交叉元件设置在第一和第二波导之间，以在它们之间形成基本正交的连接。 该应用还涉及包括光学陀螺仪的系统。 该应用还涉及一种观察光学陀螺仪的特性的方法。
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