公开(公告)号：US20240201017A1

公开(公告)日：2024-06-20

申请号：US18438678

申请日：2024-02-12

Applicant: Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V.

Inventor： Dmitry Zimin ,  Ferenc Krausz

IPC: G01J11/00 ,  G01J9/04

CPC classification number: G01J11/00 ,  G01J9/04

Abstract: A method for photonic sampling of a test-waveform is provided. The method includes providing a sampling light pulse and generating a local oscillator by frequency multiplication of the sampling light pulse. The method further includes generating a signal wave by frequency mixing of the sampling light pulse and the test-waveform in a nonlinear optical element, wherein the frequency multiplication of the sampling light pulse and the frequency mixing of the sampling light pulse and the test-waveform are selected such that the local oscillator and the signal wave are at least partly spectrally overlapping. Moreover, the method includes detecting an interference signal of the local oscillator and the signal wave for various time delays of the sampling light pulse with respect to the test-waveform. A device for sampling a test-waveform is also disclosed.

公开(公告)号：US20180224335A1

公开(公告)日：2018-08-09

申请号：US15943429

申请日：2018-04-02

Applicant: Mitutoyo Corporation

Inventor： Kazuhiko Kawasaki

IPC: G01J9/04 ,  H01S3/13

CPC classification number: G01J9/04 ,  G02F2203/54 ,  H01S3/1305

Abstract: To measure the frequency of a laser, the frequency of a beat signal that is generated by the interference between an optical frequency comb, used as the reference of measurement, and the laser to be measured is measured. In such a laser frequency measurement using the optical frequency comb, at least one of a repetition frequency and a CEO frequency of the optical frequency comb is changed so that the frequency of the beat signal becomes a predetermined value, and the frequency of the beat signal is measured, so that the frequency of the laser is measured. This allows measurement of the frequency of laser having large frequency variation and low stability.

公开(公告)号：US09983052B1

公开(公告)日：2018-05-29

申请号：US14278494

申请日：2014-05-15

Applicant: Robert G. Brown

Inventor： Robert G. Brown

IPC: G01J1/44 ,  G01J1/04

CPC classification number: G01J1/44 ,  G01J1/0422 ,  G01J3/0205 ,  G01J3/10 ,  G01J3/2823 ,  G01J3/453 ,  G01J9/04 ,  G01N2021/1793 ,  G01S17/89 ,  G02F1/353 ,  G02F1/39

Abstract: An optical imaging system includes a coherent light generator, imaging optics and a detection system. The coherent light generator is configured to generate squeezed light. The imaging optics is arranged to direct the squeezed light from the coherent light generator onto a target object and to receive squeezed light reflected by the target object. The detection system includes a local oscillator configured to generate un-squeezed light at a same frequency and phase as the squeezed light, a combiner arranged to combine the received squeezed light from the imaging optics and the un-squeezed light from the local oscillator to provide combined light, and a detector arranged to receive and detect the combined light.

公开(公告)号：US20180073932A1

公开(公告)日：2018-03-15

申请号：US15561057

申请日：2016-03-16

Applicant: THALES

Inventor： Jean MINET ,  Grégoire PILLET ,  Patrick FENEYROU

IPC: G01J9/04 ,  G01S7/497

CPC classification number: G01J9/04 ,  G01S7/4911 ,  G01S7/497 ,  G01S17/325 ,  H01S5/0014 ,  H01S5/0622

Abstract: A method for reducing the peak factor of a signal transmitted in a frequency band comprising several channels, the signal using a plurality of channels in the band comprises: a step of clipping the signal, a step of subtracting the clipped signal from the signal, so as to obtain a peak signal, a step of filtering the peak signal with the aid of a multichannel filter configured to comply with a predetermined spectral mask for each of the channels used by the signal, and a step of subtracting the filtered peak signal from the signal. A device for emitting a multichannel signal implementing the method for reducing the peak factor is also provided.

公开(公告)号：US09709668B1

公开(公告)日：2017-07-18

申请号：US15072305

申请日：2016-03-16

Applicant: Lockheed Martin Coherent Technologies, Inc.

Inventor： Piotr Konrad Kondratko ,  Philip Gatt ,  John Glennon ,  Brian Carroll Redman ,  Paul J. M. Suni

IPC: G01S7/481 ,  G01S17/02 ,  G01S7/499 ,  H04B10/63 ,  H04L1/00 ,  H04B10/61

CPC classification number: G01S7/4811 ,  G01J9/04 ,  G01S7/4917 ,  G01S7/499 ,  G01S17/02 ,  G01S17/08 ,  G01S17/89 ,  H04B10/61 ,  H04B10/63 ,  H04B10/64 ,  H04B10/66 ,  H04B10/70 ,  H04L1/0042

Abstract: A reconfigurable photonic integrated circuit focal plane array (RPIC-FPA) includes detectors and photonic integrated circuit coupled to the detectors that are configured to mix a return signal beam with local oscillator (LO) beams to produce a combined beam and direct the combined beam to the detectors. The LO beams have reconfigurable optical properties enabled by the RTIC-FPA. The LO beams are individually addressed to switch the detectors between a direct detection mode and various coherent detection modes based on adjustments to the optical properties of the LO beams. In the coherent detection mode, the controller is configured to mix the return signal beam with the LO beam having adjusted optical properties to produce the combined beam, and, in the direct detection mode, the controller is configured to disable the LO beams based on adjustments to the optical properties and to direct the return signal beam to the detectors without mixing.

公开(公告)号：US20170201328A1

公开(公告)日：2017-07-13

申请号：US15319364

申请日：2015-06-16

Applicant: ETH Zürich

Inventor： Andreas Hugi ,  Gustavo Filipe Ferreira Villares ,  Jérôme Faist

IPC: H04B10/64 ,  H04B10/524 ,  H04B10/50 ,  G01J3/433 ,  G01J9/02

CPC classification number: H04B10/64 ,  G01J3/10 ,  G01J3/433 ,  G01J9/0246 ,  G01J9/04 ,  G01J2003/423 ,  H04B10/504 ,  H04B10/505 ,  H04B10/524

Abstract: A method for optical and electrical signal processing of a multi-heterodyne signal generated by a multi-mode semi-conductor laser, for a system comprising two laser sources and an sample interaction unit. At least the beam of one of the laser passes through said sample interaction unit before being combined on a detector. The first laser is tuned (40=>42) by an amount keeping the tuning result within the available detector bandwidth (55). Then the second laser is roughly tuned by the same amount as the tuning of the first laser to bring back the signal to the vicinity (48) of the original place in the RF-domain and within the bandwidth (55) of the detector. The tuning steps are repeated with different value of mode spacing for reconstructing the sample spectrum and provide a high resolution image of the dip (41) absorption line (40).

公开(公告)号：US20170138791A1

公开(公告)日：2017-05-18

申请号：US15259687

申请日：2016-09-08

Applicant: Massachusetts Institute of Technology

Inventor： David Burghoff ,  Yang Yang ,  Qing Hu

IPC: G01J3/28 ,  G01J3/10

CPC classification number: G01J3/28 ,  G01J3/10 ,  G01J3/108 ,  G01J3/2803 ,  G01J3/42 ,  G01J3/4531 ,  G01J9/04 ,  G01J2003/102 ,  G01J2003/284

Abstract: According to one aspect, a multi-heterodyne system is disclosed, which comprises a first laser source for generating multi-mode radiation having a frequency spectrum characterized by a first plurality of phase coherent frequencies, and a second laser source for generating multi-mode radiation having a frequency spectrum characterized by a second plurality of phase coherent frequencies. The system further comprises at least one detector for detecting a combination of the multi-mode radiation generated by the first and second laser sources so as to provide a multi-heterodyne signal having a frequency spectrum characterized by a plurality of beat frequencies, each beat frequency corresponding to a pairwise difference in the first and second plurality of phase coherent frequencies. The system further comprises an analyzer for receiving said multi-heterodyne signal and configured to employ a predictive model of the multi-heterodyne signal to provide estimates of any of phase error and timing error associated with the beat frequencies.

公开(公告)号：US20170122812A1

公开(公告)日：2017-05-04

申请号：US14927915

申请日：2015-10-30

Applicant: Ciena Corporation

Inventor： Vipul BHATNAGAR ,  Michael Y. FRANKEL

IPC: G01J9/00

CPC classification number: H04B10/07957 ,  G01J3/46 ,  G01J3/50 ,  G01J9/00 ,  G01J9/04 ,  H04B10/61 ,  H04J14/02

Abstract: Systems and methods to detect a wavelength of interest (λRX) amongst one or more wavelengths (λ1, λ2, . . . , λN) include receiving the one or more wavelengths (λ1, λ2, . . . , λN); using a portion of a transmitted wavelength (λTX) as a Local Oscillator (LO) signal to perform performing coherent detection with the one or more wavelengths, wherein the transmitted wavelength (λTX) and the wavelength of interest (λRX) are a bi-directional communication link; and determining a presence of the wavelength of interest (λRX) based on the coherent detection.

公开(公告)号：US08981273B2

公开(公告)日：2015-03-17

申请号：US13725563

申请日：2012-12-21

Applicant: RAM Photonics, LLC

Inventor： Ping Piu Kuo

IPC: G01J3/02 ,  G01J1/16 ,  G01J9/04 ,  H01S5/0687 ,  H01S5/40

CPC classification number: G01J1/16 ,  G01J3/02 ,  G01J9/04 ,  H01S5/0687 ,  H01S5/4087

Abstract: Embodiments of the invention provides methods and systems for synthesizing optical signals with high frequency stability. Using a set of external optical signal manipulators and control systems, embodiments of the invention enhance the resolution of any frequency reference and thereby alleviates the needs for ultra-high-Q cavities in frequency-stable optical signal synthesis. The invention consequently improves the performance of any optical signal generator by a substantial margin, while maintaining the system complexity and power dissipation at levels comparable to the original systems.

Abstract translation: 本发明的实施例提供了用于合成具有高频稳定性的光信号的方法和系统。 使用一组外部光信号操纵器和控制系统，本发明的实施例增强了任何频率参考的分辨率，从而减轻了频率稳定的光信号合成中超高Q空腔的需要。 因此，本发明在任何光学信号发生器的性能上大幅度提高，同时将系统复杂性和功率耗散维持在与原始系统相当的水平。

公开(公告)号：US08716677B2

公开(公告)日：2014-05-06

申请号：US13353029

申请日：2012-01-18

Applicant: Meng Cui

Inventor： Meng Cui

IPC: G01J1/58 ,  G01B9/02 ,  G02B27/00 ,  A61B5/00 ,  G01J3/45

CPC classification number: G01B9/02091 ,  A61B5/0062 ,  A61B5/0066 ,  G01J3/45 ,  G01J9/02 ,  G01J9/04 ,  G02B26/06 ,  G02B27/0031

Abstract: An apparatus includes a transverse scanning optical system in the path of a first light beam traveling along a first optic axis; a wavefront correction system in the path of a second light beam traveling along a second optic axis, the wavefront correction system including a wavefront correction device having a spatial phase profile on its surface; a beam combiner that receives the first light beam and the second light beam and outputs an interference beam having a beat frequency equal to a difference frequency between the first light beam and second light beam; and a detection system placed relative to a random scattering medium, which is in the path of the interference beam. The detection system detects measurement light produced by the random scattering medium while the interference beam strikes the random scattering medium.

Abstract translation: 一种装置包括在沿着第一光轴行进的第一光束的路径中的横向扫描光学系统; 所述波前校正系统包括沿着第二光轴行进的第二光束的路径中的波前校正系统，所述波前校正系统包括在其表面上具有空间相位轮廓的波前校正装置; 接收第一光束和第二光束并且输出具有等于第一光束和第二光束之间的差分频率的拍频的干涉光束的光束组合器; 以及相对于在干涉光束的路径中的随机散射介质放置的检测系统。 检测系统检测由随机散射介质产生的测量光，同时干涉光束照射随机散射介质。