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    COMPACT MICRORESONATOR FREQUENCY COMB
    1.
    发明申请
    COMPACT MICRORESONATOR FREQUENCY COMB 有权

    公开(公告)号：US20210294180A1

    公开(公告)日：2021-09-23

    申请号：US17225012

    申请日：2021-04-07

    Applicant: IMRA America, Inc.

    Inventor： Naoya Kuse ,  Martin E. Fermann ,  Tomohiro Tetsumoto ,  Antoine Jean Gilbert Rolland

    IPC: G02F1/35 ,  G01S7/481

    Abstract: Systems and methods for precision control of microresonator (MR) based frequency combs can implement optimized MR actuators or MR modulators to control long-term locking of carrier envelope offset frequency, repetition rate, or resonance offset frequency of the MR. MR modulators can also be used for amplitude noise control. MR parameters can be locked to external reference frequencies such as a continuous wave laser or a microwave reference. MR parameters can be selected to reduce cross talk between the MR parameters, facilitating long-term locking. The MR can be locked to an external two wavelength delayed self-heterodyne interferometer for low noise microwave generation. An MR-based frequency comb can be tuned by a substantial fraction or more of the free spectral range (FSR) via a feedback control system. Scanning MR frequency combs can be applied to dead-zone free spectroscopy, multi-wavelength LIDAR, high precision optical clocks, or low phase noise microwave sources.

    Systems and methods for low noise frequency multiplication, division, and synchronization
    2.
    发明授权
    Systems and methods for low noise frequency multiplication, division, and synchronization 有权

    公开(公告)号：US10454238B2

    公开(公告)日：2019-10-22

    申请号：US15725849

    申请日：2017-10-05

    Applicant: IMRA America, Inc.

    Inventor： Martin E. Fermann ,  Naoya Kuse

    IPC: H01S3/13 ,  H01S3/067 ,  H01S3/00 ,  H03B17/00 ,  H01S3/107 ,  H01S3/11 ,  H01S3/136 ,  H01S3/23 ,  H03D7/14 ,  H03F3/08 ,  H03L7/24

    Abstract: Low phase noise radio frequency (RF) sources generated by voltage controlled oscillators (VCOs) are described. Optical modulators driven by a VCO may be used to generate optical side-bands to cw lasers. The spectral extent of said side-bands can be increased via frequency broadening in highly nonlinear waveguides. Free running mode locked low phase noise comb oscillators can be used as reference oscillators to generate beat signals between those side-bands and individual comb modes at distal spectral regions, thereby creating an error signal used to reduce the phase noise of VCOs and the generation of low phase noise RF signals. VCO phase noise may be reduced by using free-running modelocked comb lasers phase locked to external frequency references, by omitting a reference comb and using a nonlinear interferometer for generating an error signal, or by locking a slave comb to the modulation frequency of an intra-cavity modulator driven by the VCO.

    Compact microresonator frequency comb
    4.
    发明授权
    Compact microresonator frequency comb 有权

    公开(公告)号：US11409185B2

    公开(公告)日：2022-08-09

    申请号：US17225012

    申请日：2021-04-07

    Applicant: IMRA America, Inc.

    Inventor： Naoya Kuse ,  Martin E. Fermann ,  Tomohiro Tetsumoto ,  Antoine Jean Gilbert Rolland

    IPC: G02F1/35 ,  G01S7/481 ,  G04F5/14

    Abstract: Systems and methods for precision control of microresonator (MR) based frequency combs can implement optimized MR actuators or MR modulators to control long-term locking of carrier envelope offset frequency, repetition rate, or resonance offset frequency of the MR. MR modulators can also be used for amplitude noise control. MR parameters can be locked to external reference frequencies such as a continuous wave laser or a microwave reference. MR parameters can be selected to reduce cross talk between the MR parameters, facilitating long-term locking. The MR can be locked to an external two wavelength delayed self-heterodyne interferometer for low noise microwave generation. An MR-based frequency comb can be tuned by a substantial fraction or more of the free spectral range (FSR) via a feedback control system. Scanning MR frequency combs can be applied to dead-zone free spectroscopy, multi-wavelength LIDAR, high precision optical clocks, or low phase noise microwave sources.

    INTEGRATED PHOTONIC MICROWAVE TRANSCEIVER SYSTEM
    5.
    发明申请
    INTEGRATED PHOTONIC MICROWAVE TRANSCEIVER SYSTEM 审中-公开

    公开(公告)号：US20190028203A1

    公开(公告)日：2019-01-24

    申请号：US16038644

    申请日：2018-07-18

    Applicant: IMRA America, Inc.

    Inventor： Naoya Kuse ,  Antoine Jean Gilbert Rolland ,  Yihan Li ,  Martin E. Fermann

    IPC: H04B10/50 ,  H04J14/02 ,  H04B10/548 ,  G02F3/00

    Abstract: Examples of systems and methods for integrated photonic broadband microwave transceivers are disclosed based on integrated coherent dual optical frequency combs. In some cases, when the system is configured as a transmitter, multiple radio frequency (RF) carriers can be generated, which can either be encoded independently, or used for broadcasting the same information into different bands. In some cases, when the system is configured as a receiver, the spectrum of the input signal can be sliced into several spectral segments for low-bandwidth detection and analysis. In some systems, the optics-related functionalities can be achieved via integrated optic technology, for example based on silicon photonics, providing tremendous possibilities for mass-production with significantly reduced system footprint.

    ULTRA-LOW NOISE PHOTONIC PHASE NOISE MEASUREMENT SYSTEM FOR MICROWAVE SIGNALS
    6.
    发明申请
    ULTRA-LOW NOISE PHOTONIC PHASE NOISE MEASUREMENT SYSTEM FOR MICROWAVE SIGNALS 审中-公开

    公开(公告)号：US20180180655A1

    公开(公告)日：2018-06-28

    申请号：US15901186

    申请日：2018-02-21

    Applicant: IMRA America, Inc.

    Inventor： Naoya Kuse ,  Martin E. Fermann ,  Antoine Jean Gilbert Rolland

    IPC: G01R29/26 ,  G01R31/28 ,  H04B10/63

    CPC classification number: G01R29/26 ,  G01R23/17 ,  G01R31/2824 ,  H04B10/63 ,  H04B2210/006

    Abstract: Systems and methods for precision phase noise measurements of radio frequency (RF) oscillators are provided. An RF signal under test can be modulated on a continuous wave (cw) laser carrier frequency via generation of modulation sidebands using an appropriate modulator. A photonic delay line can be implemented as a self-heterodyne detection system for the phase noise, allowing for photonic down-conversion of the phase noise measurement to direct current (DC). The self-heterodyne detection system allows detection outside of any 1/f noise issues. Ultra-low phase noise detection for RF frequencies in a range from below 1 GHz to beyond 100 GHz is enabled with a low noise floor in the whole frequency range. Higher-order modulation sidebands can further reduce the noise floor of the system. Ultra-low noise RF (microwave) output can be generated. The RF signal under test can be generated by a dielectric resonance oscillator or opto-electronic oscillator.

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