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    Optical transmitter that transmits multi-level optical signal
    1.
    发明授权
    Optical transmitter that transmits multi-level optical signal 有权

    公开(公告)号：US12126386B2

    公开(公告)日：2024-10-22

    申请号：US17953375

    申请日：2022-09-27

    Applicant: Fujitsu Limited

    Inventor： Shinsuke Tanaka ,  Tomoyuki Akiyama

    IPC: H04B10/50 ,  H04B10/548

    CPC classification number: H04B10/548 ,  H04B10/501

    Abstract: Optical transmitter includes: signal processing circuit, optical modulator, optical filter, and delay circuit. The signal processing circuit generates N drive signals for generating a modulated optical signal. Symbol rate of the modulated optical signal is fs and each symbol of the modulated optical signal transmits N bits. The optical modulator includes Mach-Zehnder interferometer and N phase-shift segments each of which shifts a phase of light propagating through an optical path of the Mach-Zehnder interferometer according to the N drive signals. The optical filter removes, from output light of the optical modulator, a frequency component in a range of ±fs/2 with respect to a center frequency of the modulated optical signal, and extracts at least a part of other frequency components. The delay circuit controls timings of the N drive signals so as to reduce optical power of the frequency component extracted by the optical filter.

    SUBMINIATURE OPTICAL TRANSMISSION MODULE AND METHOD FOR MANUFACTURING SAME BY USING SEMICONDUCTOR PACKAGING SCHEME
    2.
    发明公开
    SUBMINIATURE OPTICAL TRANSMISSION MODULE AND METHOD FOR MANUFACTURING SAME BY USING SEMICONDUCTOR PACKAGING SCHEME 审中-公开

    公开(公告)号：US20240259103A1

    公开(公告)日：2024-08-01

    申请号：US18630316

    申请日：2024-04-09

    Applicant: LIPAC CO., LTD.

    Inventor： Seong Wook CHOI ,  Young June PARK

    IPC: H04B10/50 ,  G02B6/42 ,  H04J14/02 ,  H04Q11/00

    CPC classification number: H04B10/501 ,  G02B6/4215 ,  G02B6/4228 ,  H04J14/02 ,  H04Q2011/0032

    Abstract: Provided are an optical transmission module including: a mold body having a first surface and a second surface opposite to the first surface; edge-type light emitting elements, each of which is molded inside the mold body by fitting same to the first surface so as to match with the first surface and generates an optical signal in an edge direction of a chip; and an optical component disposed on one side of the edge-type light emitting elements and molded inside the mold body, the optical component includes, on one side thereof, a plurality of input waveguides corresponding to the edge-type light emitting elements, and optically processes or transmits the plurality of optical signals incident through the plurality of input waveguides, and an optical axis of each of the light emitting elements and an optical axis of each of the input waveguides of the optical component is optically aligned.

    APPARATUS AND METHODS TO FACILITATE SECURE SIGNAL TRANSMISSION
    4.
    发明公开
    APPARATUS AND METHODS TO FACILITATE SECURE SIGNAL TRANSMISSION 审中-公开

    公开(公告)号：US20240048248A1

    公开(公告)日：2024-02-08

    申请号：US18216457

    申请日：2023-06-29

    Applicant: The United States of America, as represented by the Secretary of the Navy

    Inventor： Matthew M. Sheehan

    IPC: H04B10/85 ,  H04B10/112 ,  H04B10/50

    CPC classification number: H04B10/85 ,  H04B10/112 ,  H04B10/501

    Abstract: Provided are apparatus and methods for transmission of a signal in a safe and secure fashion. Embodiments include apparatus and methods that surround a signal beam(s) of interest with outer beams/signals to protect the inner signal. The outer beams construct a conduit like tunnel through which the signal beam(s) travels inside of for transmission to a receiving device. These outer beams further offer safety and security to the signal beam(s) of interest by cutting the signal source if these outer beams are broken. The outer beams can also modify the atmosphere around the signal beam(s) to an ideal, predetermined atmosphere to maximize signal propagation and minimize signal noise and loss.

    Remote control system for improving target specificity
    5.
    发明授权
    Remote control system for improving target specificity 有权

    公开(公告)号：US11875672B2

    公开(公告)日：2024-01-16

    申请号：US18303625

    申请日：2023-04-20

    Applicant: ROKU, INC.

    Inventor： Eric Casten Riepling

    IPC: G08C23/04 ,  H04B10/50

    CPC classification number: G08C23/04 ,  H04B10/501

    Abstract: Disclosed herein are system, apparatus, article of manufacture, method and/or computer program product embodiments, and/or combinations and sub-combinations thereof, for a remote control system that improves one or more of directionality, target specificity, signal specificity, and bandwidth. An example embodiment is a remote control system that includes a radiation source configured to generate an infrared radiation projection based on one or more remote control codes to control a device. The remote control system further includes an optical controller configured to adjust one or more parameters associated with the infrared radiation projection before the infrared radiation projection is emitted to the device.

    Intensity modulated direct detection broad optical-spectrum source communication
    7.
    发明授权
    Intensity modulated direct detection broad optical-spectrum source communication 有权

    公开(公告)号：US10038499B2

    公开(公告)日：2018-07-31

    申请号：US14984093

    申请日：2015-12-30

    Applicant: Facebook, Inc.

    Inventor： Kevin Michael Birnbaum

    IPC: H04B10/112 ,  H04B10/516 ,  H04B10/50

    CPC classification number: H04B10/112 ,  H04B10/118 ,  H04B10/501 ,  H04B10/516 ,  H04B10/541

    Abstract: Optical systems and methods for transmission of multiple beams and direct detection of those beams are described. One transmitter for use in a free space optical communication system includes a broad spectrum light source and an optical component including a plurality of sections positioned to receive an optical beam produced by the broad spectrum light source. The sections of the optical component are formed to introduce optical path differences into portions of the optical beam that impinge on the optical component such that each section introduces a delay into a corresponding portion of the optical beam. The introduced delays cause each portion of the optical beam to lack coherence with other portions of the optical beam. A direct detection receiver detects the intensity of the aggregate beams and produces a signal with improved signal-to-noise ratio. The disclosed technology can be used with modulated optical beams such as intensity modulated beams.

    PHOTONIC MICROWAVE MIXING APPARATUS AND METHOD THEREOF
    10.
    发明申请
    PHOTONIC MICROWAVE MIXING APPARATUS AND METHOD THEREOF 审中-公开

    公开(公告)号：US20180048393A1

    公开(公告)日：2018-02-15

    申请号：US15432037

    申请日：2017-02-14

    Applicant: NATIONAL CHENG KUNG UNIVERSITY

    Inventor： SHENG-KWANG HWANG ,  YU-HAN HUNG

    IPC: H04B10/564 ,  H04B10/516 ,  G02F1/35 ,  H04B10/50

    CPC classification number: H04B10/564 ,  G02F1/353 ,  H04B10/2575 ,  H04B10/501 ,  H04B10/503 ,  H04B10/516 ,  H04B2210/006

    Abstract: A photonic microwave mixing apparatus and method thereof are disclosed. An optical input carrying a frequency-to-be-converted microwave signal is injected into a photonic microwave mixing module of the photonic microwave mixing apparatus, wherein the photonic microwave mixing module includes a microwave mixing laser. The optical power and carrier frequency of the optical input are adjusted so as to place the microwave mixing laser in period-one nonlinear dynamics, and, at the same time, to achieve frequency-unlocking between the oscillation sidebands of the period-one nonlinear dynamics and the modulation sidebands of the optical input. Under such operation, the microwave mixing laser emits a nonlinear wave-mixing optical signal. Properly selecting the frequency components of the nonlinear wave-mixing optical signal through an optical frequency component selector generates an optical output carrying a frequency-converted microwave signal, therefore achieving microwave frequency conversion.

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