WO2022029872A1 - Optical fiber and optical fiber transmission system - Google Patents
Optical fiber and optical fiber transmission system Download PDFInfo
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- WO2022029872A1 WO2022029872A1 PCT/JP2020/029775 JP2020029775W WO2022029872A1 WO 2022029872 A1 WO2022029872 A1 WO 2022029872A1 JP 2020029775 W JP2020029775 W JP 2020029775W WO 2022029872 A1 WO2022029872 A1 WO 2022029872A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/032—Optical fibres with cladding with or without a coating with non solid core or cladding
Definitions
- This disclosure relates to optical fibers and optical fiber transmission systems.
- GAWBS Guided acoustic-wave Brillouin scattering
- Non-Patent Documents 1 and 2 show that noise due to GAWBS can be reduced by an optical fiber having a plurality of pore structures uniform in the longitudinal direction.
- An optical fiber having a pore structure has a problem that the manufacturing process is complicated and it is difficult to stably manufacture a long fiber, for example, a plurality of holes are formed in the optical fiber manufacturing process and precise control is required. Has.
- the optical fiber of the present disclosure is An optical fiber having a clad and a core having a higher refractive index than the clad. At least one of the core or the clad is provided with one or more cavities located at positions other than the center of the core.
- the optical fiber transmission system of the present disclosure is A transmitter that transmits optical signals and The optical fiber according to the present disclosure, which propagates an optical signal transmitted from the transmission unit, and A receiving unit that receives an optical signal propagated by the optical fiber, To prepare for.
- An example of the structure of the optical fiber according to the present disclosure is shown.
- An example of the AA'cross section is shown. It is a distribution of acoustic modes (TR 2, 7 modes) that induce GAWBS . It is an example of the scattering spectrum of GAWBS in a general-purpose single-mode optical fiber.
- An example of the radial intensity of the acoustic mode is shown.
- An example of the relationship between the power attenuation of the acoustic wave due to the cavity is shown.
- An example of the system configuration of the present disclosure is shown.
- the present disclosure is an optical fiber having a clad region and a core region having a higher refractive index than the clad region, and is discrete in one or in the longitudinal direction in either or both of the clad region and / or the core region of the optical fiber. It is characterized by having a hollow portion that is specifically arranged.
- FIG. 1 shows a structural example of the optical fiber according to the present disclosure.
- one or both of the regions of the clad 12 of the optical fiber and / or the region of the core 11 are provided with cavities 13 discretely arranged in the longitudinal direction.
- the cavity portion 13 is arranged at a non-center position, that is, a position other than the center of the core 11.
- FIG. 3 shows the distribution of acoustic modes (TR 2, 7 modes) that induce GAWBS .
- TR 2, 7 modes acoustic modes
- the acoustic wave spreads and is distributed throughout the clad, and the interaction with the light wave produces GAWBS. Therefore, in the present disclosure, the cavity portion 13 is arranged at a non-centered position in the optical fiber. As a result, the generated acoustic wave is lost and attenuated due to the presence of the cavity portion 13, and as a result, the GAWBS is reduced with respect to the propagated light.
- one cavity 13 is arranged in the cross section, but it is preferable to arrange two or more of them because the acoustic wave can be more attenuated. Further, the cavity portion 13 can be arranged in the optical fiber at an arbitrary position and size by a processing technique such as laser processing using a femtosecond laser.
- FIG. 4 is an example of the scattering spectrum of GAWBS in a general-purpose single-mode optical fiber.
- a general-purpose optical fiber has multiple peaks discretely in a frequency band of 1 GHz or less, and particularly large scattering may occur in TR 2, 5 , TR 2, 7 , and TR 2, 13 modes of acoustic mode. I understand.
- FIG. 5 shows an example of the radial intensity of the acoustic mode.
- the horizontal axis is the normalized position r / D in which the center position r of the cavity 13 is standardized by the clad diameter D, and the vertical axis is the normalized acoustic wave intensity compared with the intensity of the acoustic wave when the cavity 13 is not present.
- the center position r is the distance from the center of the core 11 to the center of the cavity 13.
- the solid line, broken line, and dotted line represent TR 2, 5 , TR 2, 7 , and TR 2, 13 modes, respectively.
- the normalized position r / D is small, that is, a relatively large intensity is generated at a position near the center, and this produces a large GAWBS by the interaction with the light wave.
- the standardized position r / D has the highest strength at 0.02 to 0.12.
- the cavity portion 13 is arranged at the normalized position r / D where the normalized acoustic wave intensity becomes large.
- the normalized position r / D at which the standardized acoustic wave intensity is maximized, and the normalized position r / D where a plurality of acoustic modes overlap.
- the present disclosure can efficiently attenuate the acoustic wave and reduce the GAWBS.
- FIG. 6 shows an example of the relationship between the amount of power attenuation of the acoustic wave due to the cavity 13.
- the horizontal axis is the normalized cavity diameter in which the diameter of the cavity 13 is standardized by the clad diameter, and the vertical axis is the reduction rate of the acoustic power as compared with the case where the cavity 13 is not present.
- the acoustic mode was set to TR 2, 7 mode, which shows a large peak of GAWBS .
- the cavity 13 is enlarged to receive and attenuate the loss, and a reduction effect of 10% or more can be obtained when the diameter of the normalized cavity is 0.07 or more. It is preferable to adopt a plurality of discrete arrangements in the longitudinal direction of the optical fiber or a plurality of arrangements in the cross section because a higher suppression effect can be obtained.
- FIG. 7 shows an example of the optical fiber transmission system according to the present disclosure.
- the transmission unit 91 and the reception unit 92 are connected by an optical fiber transmission line 93.
- the optical fiber transmission line 93 of the present disclosure includes the optical fiber of the present disclosure at least in part.
- the transmission unit 91 transmits an optical signal.
- the optical fiber transmission line 93 propagates the optical signal transmitted from the transmission unit 91.
- the receiving unit 92 receives the optical signal propagated in the optical fiber transmission line 93.
- the optical signal can be, for example, an optical signal such as quantum communication or multi-level intensity / phase modulation (QAM: Quadrature Amplitude Modulation) that is greatly affected by GAWBS.
- QAM Quadrature Amplitude Modulation
- the optical fiber of the present disclosure can attenuate the acoustic wave generated in the optical fiber. Therefore, the noise power of the GAWBS generated in the optical fiber transmission line 93 is smaller than the noise power of the GAWBS generated by the same transmission power in the general-purpose single-mode fiber. Therefore, the optical fiber transmission system of the present disclosure can reduce the noise generated by GAWBS. For example, when the transmitting unit 91 and the receiving unit 92 transmit and receive optical signals using quantum communication or multi-valued intensity / phase modulation, the influence of GAWBS becomes large, so that the effects of the present disclosure can be further exerted.
- the acoustic wave generated in the optical fiber is easily attenuated, and GAWBS is used. It is possible to reduce the noise caused by the noise.
- This disclosure can be applied to the information and communication industry.
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Abstract
The purpose of the present disclosure is to make it possible to easily attenuate acoustic waves generated in an optical fiber and reduce noise generated by guided acoustic-wave Brillouin scattering (GAWBS). The present disclosure is an optical fiber that includes cladding and a core for which the refractive index is higher than the cladding, wherein the core and/or the cladding is provided with at least one cavity section disposed in a position other than the center of the core.
Description
本開示は、光ファイバ及び光ファイバ伝送システムに関する。
This disclosure relates to optical fibers and optical fiber transmission systems.
量子通信や多値度の高いコヒーレント多値伝送では、信号伝送のために十分な信号－雑音比と偏波間のクロストークの低減が必要となる。特に光ファイバ中で発生するＧＡＷＢＳ（Ｇｕｉｄｅｄ ａｃｏｕｓｔｉｃ－ｗａｖｅ Ｂｒｉｌｌｏｕｉｎ ｓｃａｔｔｅｒｉｎｇ）は、伝送する光信号によって誘起される音響波により数ＧＨｚ以下の偏波変調成分を生じ、雑音成分として伝送特性を制限することが知られている。
In quantum communication and coherent multi-valued transmission with high multi-valued degree, it is necessary to reduce the signal-to-noise ratio and crosstalk between polarizations sufficiently for signal transmission. In particular, GAWBS (Guided acoustic-wave Brillouin scattering) generated in an optical fiber may generate a polarization modulation component of several GHz or less by an acoustic wave induced by an optical signal to be transmitted, and may limit transmission characteristics as a noise component. Are known.
非特許文献１及び２では、長手方向に一様な複数の空孔構造を有する光ファイバによって、ＧＡＷＢＳによる雑音を低減できることが示されている。空孔構造を有する光ファイバは、光ファイバの作製プロセスで複数の空孔を形成し精密な制御を要するなど、その製造プロセスが複雑になり長尺で安定的な作製が困難である、といった課題を有する。
Non-Patent Documents 1 and 2 show that noise due to GAWBS can be reduced by an optical fiber having a plurality of pore structures uniform in the longitudinal direction. An optical fiber having a pore structure has a problem that the manufacturing process is complicated and it is difficult to stably manufacture a long fiber, for example, a plurality of holes are formed in the optical fiber manufacturing process and precise control is required. Has.
本開示は、光ファイバ中に生じる音響波を容易に減衰させ、ＧＡＷＢＳによって生じる雑音を低減することを目的とする。
It is an object of the present disclosure to easily attenuate the acoustic wave generated in the optical fiber and reduce the noise generated by GAWBS.
本開示の光ファイバは、
クラッドと前記クラッドよりも屈折率の高いコアとを有する光ファイバであって、
前記コア又は前記クラッドの少なくともいずれかに、前記コアの中心以外の位置に配置されている１つ以上の空洞部を備える。 The optical fiber of the present disclosure is
An optical fiber having a clad and a core having a higher refractive index than the clad.
At least one of the core or the clad is provided with one or more cavities located at positions other than the center of the core.
クラッドと前記クラッドよりも屈折率の高いコアとを有する光ファイバであって、
前記コア又は前記クラッドの少なくともいずれかに、前記コアの中心以外の位置に配置されている１つ以上の空洞部を備える。 The optical fiber of the present disclosure is
An optical fiber having a clad and a core having a higher refractive index than the clad.
At least one of the core or the clad is provided with one or more cavities located at positions other than the center of the core.
本開示の光ファイバ伝送システムは、
光信号を送信する送信部と、
前記送信部から送信された光信号を伝搬する、本開示に係る光ファイバと、
前記光ファイバで伝搬された光信号を受信する受信部と、
を備える。 The optical fiber transmission system of the present disclosure is
A transmitter that transmits optical signals and
The optical fiber according to the present disclosure, which propagates an optical signal transmitted from the transmission unit, and
A receiving unit that receives an optical signal propagated by the optical fiber,
To prepare for.
光信号を送信する送信部と、
前記送信部から送信された光信号を伝搬する、本開示に係る光ファイバと、
前記光ファイバで伝搬された光信号を受信する受信部と、
を備える。 The optical fiber transmission system of the present disclosure is
A transmitter that transmits optical signals and
The optical fiber according to the present disclosure, which propagates an optical signal transmitted from the transmission unit, and
A receiving unit that receives an optical signal propagated by the optical fiber,
To prepare for.
本開示によれば、光ファイバ中に生じる音響波を容易に減衰させ、ＧＡＷＢＳによって生じる雑音を低減することができる。
According to the present disclosure, it is possible to easily attenuate the acoustic wave generated in the optical fiber and reduce the noise generated by GAWBS.
以下、本開示の実施形態について、図面を参照しながら詳細に説明する。なお、本開示は、以下に示す実施形態に限定されるものではない。これらの実施の例は例示に過ぎず、本開示は当業者の知識に基づいて種々の変更、改良を施した形態で実施することができる。なお、本明細書及び図面において符号が同じ構成要素は、相互に同一のものを示すものとする。
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The present disclosure is not limited to the embodiments shown below. Examples of these implementations are merely examples, and the present disclosure can be implemented in various modified and improved forms based on the knowledge of those skilled in the art. In addition, the components having the same reference numerals in the present specification and the drawings shall indicate the same components.
本開示は、クラッド領域と前記クラッド領域よりも屈折率の高いコア領域を有する光ファイバであって、光ファイバのクラッド領域もしくはコア領域内のいずれか、または両方に、１つもしくは長手方向に離散的に配置された空洞部を有することを特徴とする。
The present disclosure is an optical fiber having a clad region and a core region having a higher refractive index than the clad region, and is discrete in one or in the longitudinal direction in either or both of the clad region and / or the core region of the optical fiber. It is characterized by having a hollow portion that is specifically arranged.
（実施形態例１）
図１に本開示に係る光ファイバの構造例を示す。図１に示すように光ファイバのクラッド１２の領域もしくはコア１１の領域内のいずれか、または両方に、１つもしくは長手方向に離散的に配置された空洞部１３を有する。空洞部１３は、図２に示すように、非中心位置、すなわちコア１１の中心以外の位置に配置される。 (Embodiment Example 1)
FIG. 1 shows a structural example of the optical fiber according to the present disclosure. As shown in FIG. 1, one or both of the regions of theclad 12 of the optical fiber and / or the region of the core 11 are provided with cavities 13 discretely arranged in the longitudinal direction. As shown in FIG. 2, the cavity portion 13 is arranged at a non-center position, that is, a position other than the center of the core 11.
図１に本開示に係る光ファイバの構造例を示す。図１に示すように光ファイバのクラッド１２の領域もしくはコア１１の領域内のいずれか、または両方に、１つもしくは長手方向に離散的に配置された空洞部１３を有する。空洞部１３は、図２に示すように、非中心位置、すなわちコア１１の中心以外の位置に配置される。 (Embodiment Example 1)
FIG. 1 shows a structural example of the optical fiber according to the present disclosure. As shown in FIG. 1, one or both of the regions of the
図３はＧＡＷＢＳを誘起する音響モード（ＴＲ２，７モード）の分布である。音響波はクラッド全体に広がって分布し、光波との相互作用によりＧＡＷＢＳを生じる。そこで、本開示は、光ファイバ内の非中心の位置に空洞部１３を配置する。これによって、発生した音響波は、空洞部１３の存在により損失を受け減衰し、結果として伝搬光に対してＧＡＷＢＳが減少することとなる。
FIG. 3 shows the distribution of acoustic modes ( TR 2, 7 modes) that induce GAWBS . The acoustic wave spreads and is distributed throughout the clad, and the interaction with the light wave produces GAWBS. Therefore, in the present disclosure, the cavity portion 13 is arranged at a non-centered position in the optical fiber. As a result, the generated acoustic wave is lost and attenuated due to the presence of the cavity portion 13, and as a result, the GAWBS is reduced with respect to the propagated light.
ここで図１および図２では断面内に１つの空洞部１３を配置したが、２つ以上の複数個を配置することで音響波をより減衰でき、好ましい。また光ファイバ中への空洞部１３の配置は、フェムト秒レーザーを用いたレーザー加工などの加工技術により、任意の位置および大きさで配置することができる。
Here, in FIGS. 1 and 2, one cavity 13 is arranged in the cross section, but it is preferable to arrange two or more of them because the acoustic wave can be more attenuated. Further, the cavity portion 13 can be arranged in the optical fiber at an arbitrary position and size by a processing technique such as laser processing using a femtosecond laser.
図４は汎用的な単一モード光ファイバにおけるＧＡＷＢＳの散乱スペクトルの一例である。汎用的な光ファイバでは１ＧＨｚ以下の周波数帯に離散的に複数のピークを有し、特に音響モードのＴＲ２，５、ＴＲ２，７、ＴＲ２，１３モードに対して大きな散乱が生じることが分かる。
FIG. 4 is an example of the scattering spectrum of GAWBS in a general-purpose single-mode optical fiber. A general-purpose optical fiber has multiple peaks discretely in a frequency band of 1 GHz or less, and particularly large scattering may occur in TR 2, 5 , TR 2, 7 , and TR 2, 13 modes of acoustic mode. I understand.
図５は音響モードの半径方向の強度の一例を示している。横軸は空洞部１３の中心位置ｒをクラッド直径Ｄで規格化した規格化位置ｒ／Ｄであり、縦軸は空洞部１３がない場合の音響波の強度と比較した規格化音響波強度である。中心位置ｒはコア１１の中心から空洞部１３の中心までの距離である。実線、破線、点線はそれぞれＴＲ２，５、ＴＲ２，７、ＴＲ２，１３モードを表す。
FIG. 5 shows an example of the radial intensity of the acoustic mode. The horizontal axis is the normalized position r / D in which the center position r of the cavity 13 is standardized by the clad diameter D, and the vertical axis is the normalized acoustic wave intensity compared with the intensity of the acoustic wave when the cavity 13 is not present. be. The center position r is the distance from the center of the core 11 to the center of the cavity 13. The solid line, broken line, and dotted line represent TR 2, 5 , TR 2, 7 , and TR 2, 13 modes, respectively.
図に示すように、規格化位置ｒ／Ｄが小さい、すなわち中心に近い位置で比較的大きな強度が生じており、これが光波との相互作用により大きなＧＡＷＢＳを生じる。図５より、規格化位置ｒ／Ｄが０．０２～０．１２において最も大きな強度とっている。また、ｒ／Ｄ＝０．２，０．３３付近において各モードの規格化音響波強度が０．５以上となっていることから、複数の電界分布が大きな強度を有していることが分かる。
As shown in the figure, the normalized position r / D is small, that is, a relatively large intensity is generated at a position near the center, and this produces a large GAWBS by the interaction with the light wave. From FIG. 5, the standardized position r / D has the highest strength at 0.02 to 0.12. Further, since the normalized acoustic wave intensity of each mode is 0.5 or more in the vicinity of r / D = 0.2, 0.33, it can be seen that the plurality of electric field distributions have a large intensity. ..
そこで、本開示では、これらの規格化音響波強度の大きくなる規格化位置ｒ／Ｄに空洞部１３を配置する。例えば、少なくともいずれかの規格化音響波強度が最大となる規格化位置ｒ／Ｄや、複数の音響モードの重なる規格化位置ｒ／Ｄである。図５の例では、例えば、ＴＲ２，７モードの最大ピークになるｒ／Ｄ＝０．０６、ＴＲ２，５、ＴＲ２，７、ＴＲ２，１３モードの重なるｒ／Ｄ＝０．０２～０．１２が例示できる。これにより、本開示は、効率よく音響波を減衰させ、ＧＡＷＢＳを低減することができる。
Therefore, in the present disclosure, the cavity portion 13 is arranged at the normalized position r / D where the normalized acoustic wave intensity becomes large. For example, at least one of the normalized position r / D at which the standardized acoustic wave intensity is maximized, and the normalized position r / D where a plurality of acoustic modes overlap. In the example of FIG. 5, for example, r / D = 0.06, which is the maximum peak in TR 2,7 mode, TR 2,5 , TR 2,7 , and TR 2,13 mode overlap r / D = 0.02. ~ 0.12 can be exemplified. Thereby, the present disclosure can efficiently attenuate the acoustic wave and reduce the GAWBS.
図６は空洞部１３による音響波のパワー減衰量の関係の一例を示している。横軸は空洞部１３の直径をクラッド直径で規格化した規格化空洞直径であり、縦軸は空洞部１３がない場合と比較した音響パワーの低減率である。ここで音響モードとしては、ＧＡＷＢＳの大きなピークを示すＴＲ２，７モードとした。また空洞部１３は音響モードの断面分布で音響波強度が最も強くなる点を中心に配置した。具体的には、図５のＴＲ２，７モードの最大ピークになるｒ／Ｄ＝０．０６を用いた。図６に示すように音響モードは空洞部１３を大きくすることで損失を受け減衰し、規格化空洞直径０．０７以上で１０％以上の低減効果が得られることが分かる。光ファイバの長手方向への離散的な複数配置、又は断面内に複数配置を採用すると、より高い抑圧効果が得られるので好ましい。
FIG. 6 shows an example of the relationship between the amount of power attenuation of the acoustic wave due to the cavity 13. The horizontal axis is the normalized cavity diameter in which the diameter of the cavity 13 is standardized by the clad diameter, and the vertical axis is the reduction rate of the acoustic power as compared with the case where the cavity 13 is not present. Here, the acoustic mode was set to TR 2, 7 mode, which shows a large peak of GAWBS . Further, the cavity portion 13 is arranged around the point where the acoustic wave intensity is the strongest in the cross-sectional distribution of the acoustic mode. Specifically, r / D = 0.06, which is the maximum peak of the TR 2 and 7 modes in FIG. 5, was used. As shown in FIG. 6, it can be seen that in the acoustic mode, the cavity 13 is enlarged to receive and attenuate the loss, and a reduction effect of 10% or more can be obtained when the diameter of the normalized cavity is 0.07 or more. It is preferable to adopt a plurality of discrete arrangements in the longitudinal direction of the optical fiber or a plurality of arrangements in the cross section because a higher suppression effect can be obtained.
（実施形態例２）
図７に、本開示に係る光ファイバ伝送システムの一例を示す。本開示に係る光ファイバ伝送システムは、送信部９１と受信部９２が光ファイバ伝送路９３で接続されている。本開示の光ファイバ伝送路９３は、少なくとも一部に、本開示の光ファイバを含む。 (Embodiment Example 2)
FIG. 7 shows an example of the optical fiber transmission system according to the present disclosure. In the optical fiber transmission system according to the present disclosure, thetransmission unit 91 and the reception unit 92 are connected by an optical fiber transmission line 93. The optical fiber transmission line 93 of the present disclosure includes the optical fiber of the present disclosure at least in part.
図７に、本開示に係る光ファイバ伝送システムの一例を示す。本開示に係る光ファイバ伝送システムは、送信部９１と受信部９２が光ファイバ伝送路９３で接続されている。本開示の光ファイバ伝送路９３は、少なくとも一部に、本開示の光ファイバを含む。 (Embodiment Example 2)
FIG. 7 shows an example of the optical fiber transmission system according to the present disclosure. In the optical fiber transmission system according to the present disclosure, the
送信部９１は、光信号を送信する。光ファイバ伝送路９３は、送信部９１から送信された光信号を伝搬する。受信部９２は、光ファイバ伝送路９３で伝搬された光信号を受信する。光信号は、例えば、量子通信や多値の強度・位相変調（ＱＡＭ：Ｑｕａｄｒａｔｕｒｅ Ａｍｐｌｉｔｕｄｅ Ｍｏｄｕｌａｔｉｏｎ）などのＧＡＷＢＳの影響が大きくなるような光信号でありうる。
The transmission unit 91 transmits an optical signal. The optical fiber transmission line 93 propagates the optical signal transmitted from the transmission unit 91. The receiving unit 92 receives the optical signal propagated in the optical fiber transmission line 93. The optical signal can be, for example, an optical signal such as quantum communication or multi-level intensity / phase modulation (QAM: Quadrature Amplitude Modulation) that is greatly affected by GAWBS.
本開示の光ファイバは、光ファイバ中に生じる音響波を減衰させることができる。このため、光ファイバ伝送路９３において生じるＧＡＷＢＳの雑音電力が、汎用的な単一モードファイバにおいて同じ送信パワーで生じるＧＡＷＢＳの雑音電力に比べて小さい。このため、本開示の光ファイバ伝送システムは、ＧＡＷＢＳによって生じる雑音を低減することができる。例えば、送信部９１及び受信部９２が量子通信や多値の強度・位相変調を用いて光信号を送受信する場合、ＧＡＷＢＳの影響が大きくなるため、本開示の効果をより発揮することができる。
The optical fiber of the present disclosure can attenuate the acoustic wave generated in the optical fiber. Therefore, the noise power of the GAWBS generated in the optical fiber transmission line 93 is smaller than the noise power of the GAWBS generated by the same transmission power in the general-purpose single-mode fiber. Therefore, the optical fiber transmission system of the present disclosure can reduce the noise generated by GAWBS. For example, when the transmitting unit 91 and the receiving unit 92 transmit and receive optical signals using quantum communication or multi-valued intensity / phase modulation, the influence of GAWBS becomes large, so that the effects of the present disclosure can be further exerted.
以上説明したように、本開示は、光ファイバ中に１つもしくは複数の空洞部を断面内もしくは長手方向に離散的に配置することで、光ファイバ中に生じる音響波を容易に減衰させ、ＧＡＷＢＳによって生じる雑音を低減することができる。
As described above, in the present disclosure, by arranging one or more cavities in the optical fiber discretely in the cross section or in the longitudinal direction, the acoustic wave generated in the optical fiber is easily attenuated, and GAWBS is used. It is possible to reduce the noise caused by the noise.
本開示は情報通信産業に適用することができる。
This disclosure can be applied to the information and communication industry.
１１：コア
１２：クラッド
１３、１３－１、１３－２、１３－３、１３－４、１３－５：空洞部
９１：送信部
９２：受信部
９３：光ファイバ伝送路 11: Core 12: Clad 13, 13-1, 13-2, 13-3, 13-4, 13-5: Cavity 91: Transmitter 92: Receiver 93: Optical fiber transmission line
１２：クラッド
１３、１３－１、１３－２、１３－３、１３－４、１３－５：空洞部
９１：送信部
９２：受信部
９３：光ファイバ伝送路 11: Core 12: Clad 13, 13-1, 13-2, 13-3, 13-4, 13-5: Cavity 91: Transmitter 92: Receiver 93: Optical fiber transmission line
Claims (6)
- クラッドと前記クラッドよりも屈折率の高いコアとを有する光ファイバであって、
前記コア又は前記クラッドの少なくともいずれかに、前記コアの中心以外の位置に配置されている１つ以上の空洞部を備える、
光ファイバ。 An optical fiber having a clad and a core having a higher refractive index than the clad.
At least one of the core or the clad is provided with one or more cavities located at positions other than the center of the core.
Optical fiber. - 前記空洞部は、前記光ファイバの長手方向に離散的に配置されている、
請求項１に記載の光ファイバ。 The cavities are discretely arranged in the longitudinal direction of the optical fiber.
The optical fiber according to claim 1. - 前記空洞部の少なくともいずれかは、前記コア及び前記クラッドを伝搬する音響波に含まれる複数の音響モードの重なる位置に配置されている、
請求項１又は２に記載の光ファイバ。 At least one of the cavities is arranged at overlapping positions of a plurality of acoustic modes contained in the acoustic wave propagating through the core and the clad.
The optical fiber according to claim 1 or 2. - 前記空洞部の少なくともいずれかは、前記コア及び前記クラッドを伝搬する音響波に含まれる少なくともいずれかの音響モードの強度が最大となる位置に配置されている、
請求項１から３のいずれかに記載の光ファイバ。 At least one of the cavities is arranged at a position where the intensity of at least one of the acoustic modes contained in the acoustic wave propagating through the core and the clad is maximized.
The optical fiber according to any one of claims 1 to 3. - 前記空洞部の少なくともいずれかは、前記コアの中心から前記空洞部の中心までの距離を前記クラッドの直径で規格化した規格化位置が０．０２以上０．１２以下の位置に配置されている、
請求項１から４のいずれかに記載の光ファイバ。 At least one of the cavities is arranged at a position where the standardized position where the distance from the center of the core to the center of the cavity is standardized by the diameter of the clad is 0.02 or more and 0.12 or less. ,
The optical fiber according to any one of claims 1 to 4. - 光信号を送信する送信部と、
前記送信部から送信された光信号を伝搬する、請求項１から５のいずれかに記載の光ファイバと、
前記光ファイバで伝搬された光信号を受信する受信部と、
を備える光ファイバ伝送システム。 A transmitter that transmits optical signals and
The optical fiber according to any one of claims 1 to 5, which propagates an optical signal transmitted from the transmission unit.
A receiving unit that receives an optical signal propagated by the optical fiber,
Fiber optic transmission system.
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