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公开(公告)号：US20200014167A1
公开(公告)日：2020-01-09
申请号：US16576371
申请日：2019-09-19
申请人： IMRA America, Inc.
摘要： Examples of compact control electronics for precision frequency combs are disclosed. Application of digital control architecture in conjunction with compact and configurable analog electronics provides precision control of phase locked loops with reduced or minimal latency, low residual phase noise, and/or high stability and accuracy, in a small form factor.
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公开(公告)号：US20230318253A1
公开(公告)日：2023-10-05
申请号：US18177410
申请日：2023-03-02
申请人： IMRA America, Inc.
CPC分类号： H01S3/302 , H01S3/0085 , H01S3/08013 , H01S3/094076 , H01S3/0941 , H01S3/10092 , H01S3/1305
摘要： Example ultra narrow linewidth Brillouin lasers are disclosed that are pumped by pump lasers that are controlled via optimal control schemes in order to stabilize the Brillouin laser output frequency and minimize the Brillouin output linewidth. The control schemes are based on feedback loops to match the pump laser frequency to the optimum Stokes shift on the one hand and to line-narrow the pump laser linewidth on the other hand via comparing the linewidth of the pump laser with the linewidth of the Brillouin laser. The feedback loops in the control schemes can be partially or fully replaced with feedforward control schemes, allowing for larger bandwidth control. Provision for simultaneous oscillation of the Brillouin lasers on two polarization modes allows for further line-narrowing of the Brillouin output. The ultra-narrow linewidth Brillouin lasers can be advantageously implemented as pumps for microresonator based frequency combs, and can also be integrated to the chip scale and be constructed with minimal vibration sensitivity. The ultra-narrow linewidth Brillouin lasers can be widely tuned and a frequency readout can be provided via the use of a frequency comb. When phase locking a frequency comb to the Brillouin laser, ultra-stable microwave generation can be facilitated.
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公开(公告)号：US20210294180A1
公开(公告)日：2021-09-23
申请号：US17225012
申请日：2021-04-07
申请人： IMRA America, Inc.
摘要： 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.
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公开(公告)号：US20230333012A1
公开(公告)日：2023-10-19
申请号：US18193954
申请日：2023-03-31
申请人： IMRA America, Inc.
IPC分类号： G01N21/3581 , G01N21/3504
CPC分类号： G01N21/3581 , G01N21/3504 , G01N2201/0612
摘要： A photonic millimeter-wave oscillator is based on a heterodyne beatnote of two continuous wave lasers and is configured to provide a narrow linewidth output when the frequency difference is disciplined with rotational spectroscopy of molecules using frequency modulation spectroscopy.
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公开(公告)号：US11409185B2
公开(公告)日：2022-08-09
申请号：US17225012
申请日：2021-04-07
申请人： IMRA America, Inc.
摘要： 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.
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公开(公告)号：US20220221583A1
公开(公告)日：2022-07-14
申请号：US17224938
申请日：2021-04-07
申请人： IMRA AMERICA, INC.
IPC分类号： G01S17/34 , G01S7/493 , G01S7/4912 , H04B10/64 , H04B10/40 , H04B10/2581 , H04B10/27
摘要： A tunable millimeter-wave signal oscillator includes two phase coherent optical oscillators, a fiber-ring cavity configured to generate two Stokes waves, and a photosensitive element converting the frequency difference of two optical oscillator into a millimeter-wave radiation. A chip-scale form factor millimeter-wave oscillator includes two continuous wave lasers, a plurality of micro-optical-resonators, an optical frequency division mechanism, two optical tunable bandpass filters, and a photosensitive element converting the pulse train of a frequency comb into a millimeter-wave radiation. A millimeter-wave phase noise analyzer includes an optical interferometer, two photosensitive elements, and a fundamental millimeter-wave frequency mixer. A millimeter-wave frequency counter includes an electro-optic optical frequency comb generator, a microwave voltage controlled oscillator, and an optoelectronic phase locked loop. A millimeter-wave electrical spectrum analyzer includes a millimeter-wave phase noise analyzer, a millimeter-wave amplitude detector, a millimeter-wave frequency counter, and a data processing unit.
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公开(公告)号：US11025027B2
公开(公告)日：2021-06-01
申请号：US16576371
申请日：2019-09-19
申请人： IMRA America, Inc.
摘要： Examples of compact control electronics for precision frequency combs are disclosed. Application of digital control architecture in conjunction with compact and configurable analog electronics provides precision control of phase locked loops with reduced or minimal latency, low residual phase noise, and/or high stability and accuracy, in a small form factor.
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公开(公告)号：US20190028203A1
公开(公告)日：2019-01-24
申请号：US16038644
申请日：2018-07-18
申请人： IMRA America, Inc.
IPC分类号： H04B10/50 , H04J14/02 , H04B10/548 , G02F3/00
摘要： 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.
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公开(公告)号：US20180180655A1
公开(公告)日：2018-06-28
申请号：US15901186
申请日：2018-02-21
申请人： IMRA America, Inc.
CPC分类号： G01R29/26 , G01R23/17 , G01R31/2824 , H04B10/63 , H04B2210/006
摘要： 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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