公开(公告)号：US20240283546A1

公开(公告)日：2024-08-22

申请号：US18430846

申请日：2024-02-02

申请人： NEC Corporation

发明人： Manabu ARIKAWA

IPC分类号： H04B10/69 ,  H04B10/2513

CPC分类号： H04B10/6971 ,  H04B10/2513

摘要： A frequency domain filter receives an input signal in a frequency domain being blocked by an overlap-save method. The frequency domain filter multiplies the input signal in the frequency domain by a coefficient for each frequency. A coefficient updating unit adaptively updates a filter coefficient of the frequency domain filter. A constraint operation unit performs an operation of a constraint on a filter coefficient of the frequency domain filter in such a way as not to be affected by distortion caused by wraparound from both ends of a block to the output signal. A frequency at which the constraint operation unit performs the operation of the constraint is lower than a frequency at which the coefficient updating unit adaptively updates the filter coefficient of the frequency domain filter.

公开(公告)号：US20240069273A1

公开(公告)日：2024-02-29

申请号：US18261651

申请日：2021-12-16

申请人： SONY GROUP CORPORATION

发明人： HIROSHI MORITA ,  YUSUKE OYAMA ,  KAZUAKI TOBA ,  MASANARI YAMAMOTO

IPC分类号： G02B6/036 ,  H04B10/2513

CPC分类号： G02B6/03661 ,  H04B10/2513

摘要： To mitigate the accuracy of misalignment to reduce costs, and to suppress an inter-mode propagation delay difference to enable high-quality transmission of signals. An optical waveguide is configured to propagate only a fundamental mode at a first wavelength and propagate at least a first-order mode as well as the fundamental mode at a second wavelength. The optical waveguide is configured such that a refractive index distribution of a core and a cladding is controlled so that the inter-mode propagation delay difference is within a predetermined threshold, for example, the inter-mode propagation delay difference is zero, when communication is performed using light of the second wavelength. For example, the first wavelength is in a 1310-nm band and the second wavelength is in an 850-nm band.

公开(公告)号：US11817906B1

公开(公告)日：2023-11-14

申请号：US17846151

申请日：2022-06-22

申请人： Mellanox Technologies, Ltd.

发明人： Mir Ashkan Seyedi ,  Liron Gantz

IPC分类号： H04B10/40 ,  H04B10/079 ,  H04B10/2513 ,  H04B10/27 ,  H04B10/2575

CPC分类号： H04B10/40 ,  H04B10/07951 ,  H04B10/25133 ,  H04B10/25759 ,  H04B10/271

摘要： A system can include an optical receiver. The optical receiver can have an optical delay component and at least one electrical component (e.g., diode, resistor and/or transistor) operatively coupled to (e.g., integrated within) the optical delay component. The system can further include a processing device, operatively coupled to a memory, that can tune an amount of optical delay implemented by the optical delay component in a low loss and/or low dispersion manner. For example, the processing device can adjust, based on optical delay tuning data (e.g., built-in self-test (BIST) data), the at least one electrical component to modify at least one property of the at least one optical delay component.

公开(公告)号：US11784716B2

公开(公告)日：2023-10-10

申请号：US17807228

申请日：2022-06-16

申请人： SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.

发明人： Yuji Kosugi

IPC分类号： H04B10/079 ,  H04B10/40 ,  H04B10/293 ,  H04B10/2513

CPC分类号： H04B10/40 ,  H04B10/07953 ,  H04B10/25137 ,  H04B10/293

摘要： A first optical transceiver includes a transmission signal processor that generates a multi-valued pulse amplitude modulation signal including a fixed bit pattern. The first optical transceiver includes an optical transmitter that transmits the multi-valued pulse amplitude modulation signal as an optical transmission signal. The first optical transceiver includes an optical receiver that receives an optical adjustment signal from a second optical transceiver to reproduce an adjustment signal from the optical adjustment signal. The first optical transceiver includes a first controller that controls the transmission signal processor based on a bit error rate included in the optical adjustment signal to adjust light power at each level of the optical transmission signal.

公开(公告)号：US20230291482A1

公开(公告)日：2023-09-14

申请号：US18012051

申请日：2020-07-30

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Shuto YAMAMOTO ,  Masanori NAKAMURA ,  Hiroki TANIGUCHI ,  Yoshiaki KISAKA

IPC分类号： H04B10/58 ,  H04B10/2513

CPC分类号： H04B10/58 ,  H04B10/2513

摘要： An optical transmission system is an optical transmission system for transmitting a signal from an optical transmitter to an optical receiver via at least a transmission line among one or more optical nodes and the transmission line, wherein the optical transmitter includes a digital filter that compensates for, between ripple components that are micro-fluctuating components in a frequency region representing a transmission characteristic of the signal in the optical transmitter and the optical receiver and non-ripple components of the transmission characteristic, at least the ripple components of the transmission characteristic, and at least one of the optical node and the optical transmitter includes an optical filter that compensates for the non-ripple components of the transmission characteristic.

公开(公告)号：US20230216585A1

公开(公告)日：2023-07-06

申请号：US17775207

申请日：2020-03-03

申请人： Korea Advanced Institute of Science and Technology

发明人： Yun Chur CHUNG ,  Byunggon KIM ,  Sunghyun BAE ,  Minsik KIM

IPC分类号： H04B10/2513 ,  H04B10/516

CPC分类号： H04B10/2513 ,  H04B10/516

摘要： Proposed are an optimal operation method of a high-frequency dithering technique for compensating for interference noise in an analog optical transmission-based mobile fronthaul network, and a transmitter using same. An interference noise compensation method using high-frequency phase dithering performed in an analog optical transmission-based mobile fronthaul network may include the steps in which: a frequency-multiplexed wireless signal is converted in an optical transmitter to an intensity-modulated optical signal; and the phase of the optical signal intensity-modulated in the optical transmitter is dithered with an Orthogonal Frequency-Division Multiplexing (OFDM) signal.

公开(公告)号：US20230061448A1

公开(公告)日：2023-03-02

申请号：US18048139

申请日：2022-10-20

申请人： II-VI Delaware, Inc.

发明人： Guomin JIANG ,  Helen CHEN ,  Xuewen LU ,  Lixin WANG ,  Qingyu LI ,  Haiji YUAN ,  Yimin JI ,  Wenyi CAO

IPC分类号： G02B6/35 ,  H04B10/2513

摘要： A module handles beams having multiple channels in an optical network. The module has a dispersion element, a liquid crystal (LC) based switching assembly, and photodetectors. The dispersion element is arranged in optical communication with the beams from inputs and is configured to disperse the beams into the channels across a dispersion direction. The switching assembly is arranged in optical communication with the channels from the dispersion element and is configured to selectively reflect the channels using electrically switchable cells of one or more LC-based switching engines. The photodetectors are arranged in optical communication with the dispersion element, and each are configured to receive selectively reflected channels for optical channel monitoring. Outputs can be arranged in optical communication with the dispersion element and can be configured to receive selectively reflected channels for wavelength selective switching.

公开(公告)号：US20230007370A1

公开(公告)日：2023-01-05

申请号：US17941269

申请日：2022-09-09

申请人： Huawei Technologies Co., Ltd.

发明人： Guangcan MI ,  Ruiqiang JI ,  Zeshan CHANG

IPC分类号： H04Q11/00 ,  H04B10/2513 ,  H04J14/02

摘要： An optical module is disclosed. The optical module includes a first downlink port, a second downlink port, a directional coupler, a optical attenuator, a first photodiode (PD), and a second PD. The directional coupler, connected to the first downlink port, is configured to receive a downlink optical signal. The second PD connected to the directional coupler, is configured to obtain a power value. If the power value is greater than a first threshold, the optical attenuator is configured to receive a attenuation control signal, and attenuate, based on the attenuation control signal, a power of an optical signal passing through the second downlink port. The first PD is configured to: convert the downlink optical signal into a downlink electrical signal, and convert the optical signal passing through the second downlink port into an electrical signal. Both the first downlink port and the second downlink port are connected to the first PD.

公开(公告)号：US11539441B1

公开(公告)日：2022-12-27

申请号：US17219563

申请日：2021-03-31

申请人： CABLE TELEVISION LABORATORIES, INC.

发明人： Mu Xu ,  Junwen Zhang ,  Haipeng Zhang ,  Zhensheng Jia ,  Luis Alberto Campos ,  Curtis D. Knittle

IPC分类号： H04B10/516 ,  H04B10/2513

摘要： A method for laser chirp precompensation includes modulating an amplitude of an optical signal, in response to an amplitude of one of (i) a chirp-compensated signal generated via distortion of an original modulated signal according to an inverse of a chirp-response function of a laser and (ii) a first signal derived from the chirp-compensated signal, to yield an amplitude-modulated optical signal. The method also includes modulating a phase of the amplitude-modulated optical signal in response to a phase of one of (i) the chirp-compensated signal and (ii) a second signal derived from the chirp-compensated signal to yield a chirp-compensated optical signal.

公开(公告)号：US20220385365A1

公开(公告)日：2022-12-01

申请号：US17329335

申请日：2021-05-25

申请人： Ciena Corporation

发明人： Sadok Aouini ,  Robert G. Gibbins ,  Yalmez Yazaw ,  Harvey Mah ,  Naim Ben-Hamida

IPC分类号： H04B10/2513 ,  H04B10/2569

摘要： An optical Digital Signal Processor (DSP) circuit includes a digital core configured to implement digital signal processing functionality and configured to operate at a plurality of baud rates including a full baud rate and a half-baud rate; and an analog interface including a Digital-to-Analog Converter (DAC) section and an Analog-to-Digital Converter (ADC) section, wherein the analog interface is connected to the digital core and is configured to operate at the full baud rate when the digital core is configured to operate at any of the plurality of baud rates.