JPWO2020008464A5 - - Google Patents

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JPWO2020008464A5
JPWO2020008464A5 JP2020569076A JP2020569076A JPWO2020008464A5 JP WO2020008464 A5 JPWO2020008464 A5 JP WO2020008464A5 JP 2020569076 A JP2020569076 A JP 2020569076A JP 2020569076 A JP2020569076 A JP 2020569076A JP WO2020008464 A5 JPWO2020008464 A5 JP WO2020008464A5
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modulation
grating
perturbation
phase shift
optical
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JP7383644B2 (en
JP2021529300A (en
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光ファイバに形成されたグレーティングの摂動を決定する方法であって、光ビームを変調し、及び前記光ファイバを通して伝送することと、前記グレーティングに反射された光の変調における、少なくとも１つの位相シフトを測定することと、前記少なくとも１つの位相シフトに基づいて、前記グレーティングの前記摂動を決定することと、を含む方法。 A method of determining the perturbation of a grating formed on an optical fiber, in which the light beam is modulated and transmitted through the grating and at least one phase shift in the modulation of the light reflected by the grating. A method comprising measuring and determining the perturbation of the grating based on the at least one phase shift. 前記変調することが、前記伝送することの前に実行される、請求項１に記載の方法。 The method of claim 1, wherein the modulation is performed prior to the transmission. 前記変調することが、前記光ビームが前記グレーティングに反射された後に実行される、請求項１又は２に記載の方法。 The method of claim 1 or 2 , wherein the modulation is performed after the light beam is reflected by the grating. 前記光ファイバが、複数のグレーティングを有して形成され、前記複数のグレーティングの少なくとも２つが、異なるブラッグ波長によって特徴付けられる、請求項１～３の何れか一項に記載の方法。 The method according to any one of claims 1 to 3 , wherein the optical fiber is formed with a plurality of gratings, and at least two of the plurality of gratings are characterized by different Bragg wavelengths. 前記少なくとも１つの位相シフトの前記測定に先立って、前記異なるブラッグ波長にそれぞれ対応する、少なくとも２つのチャネル内へと前記反射された光ビームを逆多重化することをさらに含む、請求項４に記載の方法。 4. The fourth aspect further comprises demultiplexing the reflected light beam into at least two channels corresponding to the different Bragg wavelengths, respectively, prior to the measurement of the at least one phase shift. the method of. 前記変調することが、複数の変調周波数にわたり、前記変調の周波数を走査することを含み、前記方法が、変調周波数ごとに、前記少なくとも２つのグレーティングに反射された光の変調位相シフト及び変調の大きさを測定することと、前記測定された変調位相シフト及び前記測定された変調の大きさに基づいて、前記少なくとも２つのグレーティングのそれぞれに関する、個々の光波長シフト又は光周波数シフトを決定することと、を含む、請求項４に記載の方法。 The modulation involves scanning the modulation frequencies over a plurality of modulation frequencies, wherein the method modifies the modulation phase shift and the magnitude of the modulation of the light reflected by the at least two gratings for each modulation frequency. To determine the individual optical wavelength shift or optical frequency shift for each of the at least two gratings, based on the measured modulation phase shift and the measured modulation magnitude. , The method according to claim 4 . 前記少なくとも１つの位相シフトの前記測定に先立って、前記反射された光ビームを分散させることをさらに含む、請求項２～６の何れか一項に記載の方法。 The method of any one of claims 2-6 , further comprising dispersing the reflected light beam prior to the measurement of at least one phase shift. 前記少なくとも１つの位相シフトの前記測定が、所定の位相分解能によって特徴付けられ、前記分散させることが、単位波長当たりのパルスの広がりを表す所定の分散パラメー
タによって特徴付けられ、前記変調することの周波数が、少なくとも、前記位相分解能と、前記分散パラメータに所定のスペクトル分解能閾値を乗算したものとの比である、請求項７に記載の方法。 The measurement of the at least one phase shift is characterized by a predetermined phase resolution, and the dispersion represents a predetermined dispersion parameter representing the spread of the pulse per unit wavelength.
The method of claim 7 , wherein the frequency of the modulation is at least the ratio of the phase resolution to the dispersion parameter multiplied by a predetermined spectral resolution threshold. 前記分散させることが、分散係数によって特徴付けられ、前記方法が、複数の分散係数値にわたり、前記係数の値を変動させることと、前記分散係数の値ごとに、前記グレーティングに反射された光の変調位相シフト及び変調の大きさを測定することと、前記測定された変調位相シフト及び前記測定された変調の大きさに基づいて、前記少なくとも２つのグレーティングのそれぞれに関して、個々の光波長シフト又は光周波数シフトを決定することと、を含む、請求項７に記載の方法。 The dispersion is characterized by a dispersion coefficient, wherein the method fluctuates the value of the coefficient over a plurality of dispersion coefficient values, and for each value of the dispersion coefficient, the light reflected on the grating. Individual optical wavelength shifts or light for each of the at least two gratings based on the measurement of the modulation phase shift and the magnitude of the modulation and the measured modulation phase shift and the magnitude of the measurement. 7. The method of claim 7 , comprising determining a frequency shift. 前記グレーティングの前記摂動の前記決定が、前記反射された光ビームの光パワーに関するものではない、請求項１～９の何れか一項に記載の方法。 The method of any one of claims 1-9, wherein the determination of the perturbation of the grating is not relating to the optical power of the reflected light beam. 前記反射された光ビームの光パワーを決定することなく実行される、請求項１～９の何れか一項に記載の方法。 The method according to any one of claims 1 to 9, which is carried out without determining the light power of the reflected light beam. 前記グレーティングの前記摂動の前記決定が、前記グレーティングを特徴付けるブラッグ波長のシフトとして前記摂動を表現することを含む、請求項１～１１の何れか一項に記載の方法。 The method of any one of claims 1-11, wherein the determination of the perturbation of the grating comprises expressing the perturbation as a Bragg wavelength shift characteristic of the grating. 前記グレーティングの前記摂動の前記決定が、前記グレーティングの前記摂動を生じさせる少なくとも１つの物理量として、前記摂動を表現することを含む、請求項１に記載の方法。 The method of claim 1, wherein the determination of the perturbation of the grating comprises expressing the perturbation as at least one physical quantity that causes the perturbation of the grating. 前記少なくとも１つの物理量が、周囲温度、前記ファイバに付与される圧力、前記ファイバのひずみ、及び前記ファイバの加速的運動から成る群から選択される、請求項１３に記載の方法。 13. The method of claim 13 , wherein the at least one physical quantity is selected from the group consisting of ambient temperature, pressure applied to the fiber, strain of the fiber, and accelerated motion of the fiber. 光ファイバに形成されたグレーティングの摂動を決定するためのシステムであって、
光ビームを変調するための光変調システムと、
前記光ビームを前記光ファイバ内に結合させ、前記グレーティングに反射された光を受け取るための光結合器と、
前記グレーティングに反射された光の変調における、少なくとも１つの位相シフトを測定し、前記少なくとも１つの位相シフトに基づいて、前記グレーティングの前記摂動を決定するように構成された光学的及び電気的解析システムと、
を含む、システム。

A system for determining the perturbation of a grating formed on an optical fiber.
An optical modulation system for modulating the optical beam,
An optical coupler for coupling the light beam into the optical fiber and receiving the light reflected by the grating.
An optical and electrical analysis system configured to measure at least one phase shift in the modulation of light reflected by the grating and to determine the perturbation of the grating based on the at least one phase shift. When,
Including the system.
JP2020569076A 2018-07-04 2019-07-04 Method and system for determining perturbation of a grating by modulated light Active JP7383644B2 (en)

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US201862693941P 2018-07-04 2018-07-04
US62/693,941 2018-07-04
PCT/IL2019/050742 WO2020008464A1 (en) 2018-07-04 2019-07-04 Method and system for determining grating perturbation by modulated light

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