JPS592017A - Optical isolator - Google Patents
Optical isolatorInfo
- Publication number
- JPS592017A JPS592017A JP11061882A JP11061882A JPS592017A JP S592017 A JPS592017 A JP S592017A JP 11061882 A JP11061882 A JP 11061882A JP 11061882 A JP11061882 A JP 11061882A JP S592017 A JPS592017 A JP S592017A
- Authority
- JP
- Japan
- Prior art keywords
- wavelength
- light
- optical isolator
- polarizer
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 15
- 230000010287 polarization Effects 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices 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
- G02F1/01—Devices 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 for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices 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 for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/093—Devices 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 for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【発明の詳細な説明】
（１１発明の技術分野
本発明は異なった波長を有する光についての元アイソレ
ータに関するものである。DETAILED DESCRIPTION OF THE INVENTION (11) Technical Field of the Invention The present invention relates to a source isolator for light having different wavelengths.
（２）従来技術と問題点
光アイソレータに機能的には伝送系中の光の一方通行を
行なわせる部品として用いられる。従来の元アイソレー
タ［＊１図に示したように永久磁石を用いて常に同じ方
向にファラデー回転を行なう固定４５°フアラデ一回転
子３、その前後の偏光子２、検光子２′からなり、しか
も偏光子、検光子は４５°互いに回転した位置に衝かれ
ているうこのような構成の光アイソレータは′ｙｔ、Ｚ
アイバ１から投射されたレンズ７で平行にされた後、平
行光５を偏光子２ＶＣよって特定方向のみが透過せしめ
られ更に４５°フアラデ一回転子３から偏光面が４５゜
回転して出射される。この偏光面が４５６回転した偏光
は検光子２′を透過し元ファイバ４に入射する。(2) Prior Art and Problems Optical isolators are functionally used as components that allow light to pass in one direction in a transmission system. Conventional original isolator [*1 As shown in the figure, it consists of a fixed 45° Faraday rotator 3 that always performs Faraday rotation in the same direction using a permanent magnet, a polarizer 2 in front and behind it, and an analyzer 2'. The polarizer and analyzer are rotated 45 degrees from each other.
After being made parallel by the lens 7 projected from the eyeglass 1, the parallel light 5 is transmitted only in a specific direction by the polarizer 2VC, and is further emitted from the 45° Farade rotator 3 with the plane of polarization rotated by 45°. . This polarized light whose plane of polarization has been rotated by 456 passes through the analyzer 2' and enters the original fiber 4.
一方％元ファイバ４から逆方向に来光光６は検光子２′
によシ偏光子２に対して４５°回転した偏光のみが透過
される０つｔ９偏光子２に対して９０°回転した偏光が
出射されることになり偏光子２で反射除去せしめられる
。このように順方向の光は進み逆方向の九に除去される
。本願発明者は先に特願昭５５−１７６６８７において
、順方向に対して１００憾の光が透過するアイソレータ
を提供したがいづれにせよ波長の異なる光を同一のアイ
ソレータで制御せしめる光アイソレータはない。On the other hand, the light 6 coming from the source fiber 4 in the opposite direction is transmitted to the analyzer 2'.
Only the polarized light rotated by 45° is transmitted through the polarizer 2. The polarized light rotated by 90° is emitted from the polarizer 2 and is reflected and removed by the polarizer 2. In this way, light in the forward direction travels and is removed by nine in the reverse direction. In Japanese Patent Application No. 55-176,687, the inventor of the present invention previously provided an isolator through which 100 yen of light passes in the forward direction, but there is no optical isolator that allows light of different wavelengths to be controlled by the same isolator.
（３） 発明の目的
本発明の目的は光波長によって透過順方向を異にせしめ
た元アイソレータを提供することである。(3) Purpose of the Invention The purpose of the present invention is to provide an original isolator in which the forward direction of transmission is made different depending on the wavelength of light.
（４）発明の構成
本発明の目的は４５°フア２デ一回転子の前後に偏光分
！１ｆｌ素子を設は比元アイソレータにおいて：ある波
長λ、に対して２１１ｃ の位相差板、他の波長λ、
九対して（２ｍ＋１）π位相差板となるような厚さｔ−
有する複屈折物質ｔ−元学軸が透過光の偏光面に対して
４５″傾くように前記ファラデー回転子の後に配設した
ことを特徴とする光アイソレータによって達成される。(4) Structure of the Invention The purpose of the present invention is to obtain polarized light before and after a 45° front and rear rotator! A 1fl element is set up in a ratio isolator: a 211c retardation plate for one wavelength λ, and a 211c retardation plate for another wavelength λ,
Thickness t- so that it becomes (2m+1)π retardation plate for 9
This is achieved by an optical isolator which is disposed after the Faraday rotator so that the t-element axis of the birefringent material is inclined by 45'' with respect to the polarization plane of the transmitted light.
（５）発明の実施例
以下本発明の実施例を図面に基づいて説明する０Ｎ４２
及び第３図は本発明の詳細な説明するための概略図であ
る。(5) Embodiments of the Invention Below, embodiments of the present invention will be explained based on the drawings of 0N42.
and FIG. 3 are schematic diagrams for explaining the present invention in detail.
第２図及びＷ２Ｂ図に示されているように本発明に係ろ
アイソレータは偏光子１２．４５°フア２デ一回転子１
３．複屈折物質ｌＯ１そして検死子１２′が配設されて
いる。元ファイバ（図示せず）から投射された波長λ１
の光が偏光子１２によって特定方向のみ透過せしめられ
次に４５°フアラデ一回転子１３から偏光面が更に４５
°回転して出射される。この偏光面が４５°回転した偏
光は、λ１に対して１１πの位相差を有する厚みのＶル
１折物質を通った場合、０°の旋光子として作用するの
で４５＠フアラデ一回転子１３によって４５°回転され
た壕＼の状態でＭＯ屈折物質板を透過し更に検光子１２
′を透過式れる。その透過光を１５で示す。一方λ２の
波長に対して（２ｍ＋１ ）πの位相差を有する厚みの
複屈折物質板ハ９０°の旋光子として作用する。As shown in FIG. 2 and W2B, the isolator according to the present invention has a polarizer of 12.45°, a polarizer of 2.
3. A birefringent material lO1 and a necroscope 12' are provided. wavelength λ1 projected from the original fiber (not shown)
The light of
It is rotated and emitted. When this polarized light whose plane of polarization is rotated by 45 degrees passes through a thick V1-folding material that has a phase difference of 11π with respect to λ1, it acts as a 0 degree optical rotator, so it is It passes through the MO refractive material plate in the state of the trench rotated by 45 degrees, and then the analyzer 12
′ is transparent. The transmitted light is indicated by 15. On the other hand, a thick birefringent material plate having a phase difference of (2m+1)π with respect to the wavelength λ2 acts as a 90° optical rotator.
従って第２図に示すように偏光子１２１に透過した光は
４５°フアラデ一回転子１３によって４５°回転され、
次に該複屈折物質１０により９０′回転せしめられ除去
される。その除去光を１６で示す。更に、該波長λ１及
びλ２を有する光について逆方向に進行する場合を考え
る。まず波長λ２で投射された元は検光子１２′を４５
°回転して透過された後複屈折物質板１０で９０′回転
され更に４５°フアラデ一回転子１３で４５°回転され
最終的に偏）ＹＳＳｉ２０透過することが出来る。その
透過光ｔ−１６’で示す。Therefore, as shown in FIG. 2, the light transmitted through the polarizer 121 is rotated by 45° by the 45° Farade rotator 13.
It is then rotated 90' by the birefringent material 10 and removed. The removal light is indicated by 16. Furthermore, consider the case where the lights having the wavelengths λ1 and λ2 travel in opposite directions. First, the source projected at wavelength λ2 is 45
After being rotated and transmitted through the birefringent material plate 10, the light is rotated by 90' by the birefringent material plate 10, further rotated by 45° by the Farade rotator 13, and finally transmitted through the polarized YSSi 20. The transmitted light is shown as t-16'.
一方波長λ１で投射された光は検光子１２’ｔ４５°回
転して透過された後、複屈折物質１０に対してはそのま
＼通過し、更に４５°７アラデ一回転子１３で４５°回
転され最終的に偏光子１２によシ除去される。その除去
光を１５′で示す。なお複屈折物質板を水晶として該水
晶の水平軸方向の幅を例えば１５１０μｍとすると波長
λが１．３μｎｃＫ対してば０°、λ＝１．３６５μ電
に対してハ９０°の旋光子となるＯ
これは水晶の複屈折△ｎ、厚さｄとすると位相２π△ｎ
ｄ
差は λ となり％ ｄ＝１ｆ５１０趨、△ｎ＝０
．００８６とするとλ＝１．３μに対して２０π。On the other hand, the light projected with the wavelength λ1 is rotated by 45 degrees through the analyzer 12't, transmitted through it, passes through the birefringent material 10 as it is, and is further rotated by 45 degrees by 45 degrees by the Alade single rotator 13. and is finally removed by the polarizer 12. The removal light is indicated by 15'. If the birefringent material plate is a crystal and the width of the crystal in the horizontal axis direction is, for example, 1510 μm, the optical rotation becomes 0° for the wavelength λ of 1.3 μncK, and 90° for the wavelength λ of 1.365 μc. O This is the birefringence △n of the crystal, and if the thickness d is the phase 2π△n
d difference is λ and % d=1f510 trend, △n=0
．． If 0086, then 20π for λ=1.3μ.
λ＝ｌ、３６５μに対して１９πの位相差となるからで
ある。This is because there is a phase difference of 19π with respect to λ=l and 365μ.
（６）発明の詳細
な説明したように本発明による光アイソレータによっで
ある一定の条件の異なっ念波長を有する光を、相互に逆
方向に通過せしめること、云いかえれば透過順方向を異
くせしめることが可能となる０(6) As described in detail of the invention, the optical isolator of the present invention allows lights having different optical wavelengths under certain conditions to pass in mutually opposite directions, in other words, the forward directions of transmission are different. 0 which makes it possible to force
＠１図に従来の光アイソレータを説明するための概略図
であり、ｖＲＺ図及び第３図は本発明に係る光アイソレ
ータを説明するための概略図であるの１．４・・・・・
・光ファイバ、２．１２・・・・・・偏光子、３．１３
・・・・・・４５°フアラデ一回転子、７．７′・・・
・・・レンズ、１０・・・・・・複屈折物質、１２・・
・・・・偏光子、１ｚ・・・・・・検光子。
特許出願人
皇士通株式会社
特許出願代理人
弁理士 青 木 朗
弁理士 西 舘 和 之
弁理士 内 １）幸 男
弁理士 山 口 昭 之Figure @1 is a schematic diagram for explaining a conventional optical isolator, and vRZ diagram and Figure 3 are schematic diagrams for explaining an optical isolator according to the present invention.1.4...
・Optical fiber, 2.12...Polarizer, 3.13
・・・・・・45°Fualade single rotor, 7.7′...
... Lens, 10... Birefringent substance, 12...
...Polarizer, 1z...Analyzer. Patent applicant Kojitsu Co., Ltd. Patent application agent Akira Aoki Patent attorney Kazuyuki Nishidate Patent attorney 1) Yukio Patent attorney Akira Yamaguchi
Claims (1)
光アイソレータにおいて： ある波長λ、に対し２ｎπ（ｎ−１，２，３・・・・・
・）位相差板、他の波長λ８に対して（２ｍ＋１）π（
ｍ＝１゜２．３・・・・・・）位相差板となるような厚
さを有する複屈折物質を光学軸が透過光の偏光面に対し
て４５゜傾くように前記ファラデー回転子の後に配設し
たことを特徴とする光アイソレータ。[Claims] In an optical isolator in which polarization separation elements are provided before and after a 45° Faraday rotator: 2nπ(n-1, 2, 3...) for a certain wavelength λ.
・) Retardation plate, (2m+1)π( for other wavelength λ8
m = 1゜2.3...) A birefringent material having a thickness to serve as a retardation plate is placed in the Faraday rotator so that the optical axis is inclined at 45 degrees with respect to the polarization plane of the transmitted light. An optical isolator characterized by being installed later.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11061882A JPS592017A (en) | 1982-06-29 | 1982-06-29 | Optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11061882A JPS592017A (en) | 1982-06-29 | 1982-06-29 | Optical isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS592017A true JPS592017A (en) | 1984-01-07 |
Family
ID=14540368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11061882A Pending JPS592017A (en) | 1982-06-29 | 1982-06-29 | Optical isolator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS592017A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61501798A (en) * | 1984-04-06 | 1986-08-21 | イ−ストマン コダック カンパニ− | optical spatial frequency filter |
| JPS6242113A (en) * | 1985-08-20 | 1987-02-24 | Nippon Telegr & Teleph Corp <Ntt> | Optical circulator |
-
1982
- 1982-06-29 JP JP11061882A patent/JPS592017A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61501798A (en) * | 1984-04-06 | 1986-08-21 | イ−ストマン コダック カンパニ− | optical spatial frequency filter |
| JPS6242113A (en) * | 1985-08-20 | 1987-02-24 | Nippon Telegr & Teleph Corp <Ntt> | Optical circulator |
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