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1. WO2021194630 - FREQUENCY-COMB GENERATION BASED ON ELECTRO-OPTIC PHASE-CODE MODE-LOCKING FOR CIRCULAR-RANGING OCT

Publication Number WO/2021/194630
Publication Date 30.09.2021
International Application No. PCT/US2021/015753
International Filing Date 29.01.2021
IPC
A61B 5/00 2006.1
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
G01B 9/02 2022.1
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
9Instruments as specified in the subgroups and characterised by the use of optical measuring means
02Interferometers
G01K 11/32 2021.1
GPHYSICS
01MEASURING; TESTING
KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
11Measuring temperature based on physical or chemical changes not covered by group G01K3/, G01K5/, G01K7/, or G01K9/202
32using changes in transmission, scattering or fluorescence in optical fibres
G02B 6/293 2006.1
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
24Coupling light guides
26Optical coupling means
28having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
293with wavelength selective means
H01S 3/08 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
08Construction or shape of optical resonators or components thereof
H01S 3/106 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
106by controlling a device placed within the cavity
CPC
G02F 1/39
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
35Non-linear optics
39for parametric generation or amplification of light, infra-red or ultra-violet waves
G02F 2203/50
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
2203Function characteristic
50Phase-only modulation
G02F 2203/54
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
2203Function characteristic
54Optical pulse train (comb) synthesizer
G02F 2203/56
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
2203Function characteristic
56Frequency comb synthesizer
Applicants
  • THE GENERAL HOSPITAL CORPORATION [US]/[US]
Inventors
  • VAKOC, Benjamin
  • KIM, Tae, Shik
Agents
  • KEATING, Thomas, J.
Priority Data
62/968,29931.01.2020US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) FREQUENCY-COMB GENERATION BASED ON ELECTRO-OPTIC PHASE-CODE MODE-LOCKING FOR CIRCULAR-RANGING OCT
(FR) GÉNÉRATION DE PEIGNE DE FRÉQUENCES BASÉE SUR UN VERROUILLAGE DE MODE DE CODE DE PHASE ÉLECTRO-OPTIQUE POUR TCO À TÉLÉMÉTRIE CIRCULAIRE
Abstract
(EN) A source for providing electromagnetic radiation within a particular spectral range, including: a ring-shaped optical resonator for circulating a plurality of wavelength bands including: a first optical phase modulator, a first chromatic dispersion device, a second optical phase modulator, a multi-line spectral domain filter, a second chromatic dispersion device, and an optical amplifier; a controller coupled to the first optical phase modulator and the second optical phase modulator which is configured to drive the first optical phase modulator with a first waveform and the second optical phase modulator with a second waveform, the first chromatic dispersion device being configured between the first optical phase modulator and the second optical phase modulator to provide chromatic dispersion so as to subject each of the plurality of wavelength bands to a respective plurality of different time delays, the first optical phase modulator and the second optical phase modulator being configured to create spectral broadening by the first optical phase modulator of each of the plurality of wavelength bands and spectral recovery by the second optical phase modulator of a particular wavelength band of the plurality of wavelength bands by modulating a first phase using the first optical phase modulator driven by the first waveform and, after a particular time delay, modulating a second phase using the second optical phase modulator driven by the second waveform comprising an inverse of the first waveform, the particular time delay being determined so as to create spectral recovery for the particular wavelength band of the plurality of wavelength bands, the multi-line spectral domain filter being configured to provide multi-line spectral filtering with narrow bandwidths in order to induce power loss for each of the plurality of wavelength bands except for the particular wavelength band, the second chromatic dispersion device being configured to provide chromatic dispersion compensation to an output of the multi-line spectral domain filter in order to compensate a group delay dispersion within the optical resonator and match a roundtrip frequency for each of the plurality of wavelength bands, and the first and second waveforms being configured to create a periodic phase modulation for recovery of the plurality of wavelength bands at a frequency that is an integer multiple of a roundtrip frequency of the optical resonator.
(FR) La présente invention concerne une source de rayonnement électromagnétique au sein d'une plage spectrale particulière, comprenant : un résonateur optique annulaire, permettant la circulation d'une pluralité de bandes de longueurs d'ondes comprenant : un premier modulateur de phase optique, un premier dispositif de dispersion chromatique, un second modulateur de phase optique, un filtre de domaine spectral multi-ligne, un second dispositif de dispersion chromatique et un amplificateur optique; un dispositif de commande, couplé au premier modulateur de phase optique et au second modulateur de phase optique configuré pour commander le premier modulateur de phase optique selon une première forme d'onde et le second modulateur de phase optique selon une seconde forme d'onde, le premier dispositif de dispersion chromatique étant configuré entre le premier modulateur de phase optique et le second modulateur de phase optique pour fournir une dispersion chromatique de façon à soumettre chacune des bandes de la pluralité de bandes de longueurs d'ondes à une pluralité respective de délais différents de temporisation, le premier modulateur de phase optique et le second modulateur de phase optique étant configurés pour engendrer un élargissement spectral par le premier modulateur de phase optique de chacune des bandes de la pluralité de bandes de longueurs d'ondes et une récupération spectrale par le second modulateur de phase optique d'une bande particulière de longueurs d'ondes de la pluralité de bandes de longueurs d'ondes par la modulation d'une première phase à l'aide du premier modulateur de phase optique commandé par la première forme d'onde et, après un délai particulier de temporisation, par la modulation d'une seconde phase à l'aide du second modulateur de phase optique commandé par la seconde forme d'onde, comprenant l'inverse de la première forme d'onde, le délai particulier de temporisation étant déterminé de façon à engendrer une récupération spectrale pour la bande particulière de longueurs d'ondes de la pluralité de bandes de longueurs d'ondes, le filtre de domaine spectral multi-ligne étant configuré pour fournir un filtrage spectral multi-ligne avec des largeurs de bandes étroites, afin d'induire une perte de puissance pour chacune des bandes de la pluralité de bandes de longueurs d'ondes à l'exception de la bande particulière de longueurs d'ondes, le second dispositif de dispersion chromatique étant configuré pour fournir une compensation de dispersion chromatique à une sortie du filtre de domaine spectral multi-ligne, afin de compenser une dispersion de délais de groupes au sein du résonateur optique et de faire correspondre une fréquence de propagation aller-retour pour chacune des bandes de la pluralité de bandes de longueurs d'ondes et les première et seconde formes d'ondes étant configurées pour engendrer une modulation périodique de phase pour la récupération de la pluralité de bandes de longueurs d'ondes à une fréquence qui est un multiple entier d'une fréquence de propagation aller-retour du résonateur optique.
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