TWI585465B - Multi-port light circulator - Google Patents
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Description
本發明係有關一種多埠光循環器，尤指一種光學被動元件。The present invention relates to a multi-turn light circulator, and more particularly to an optical passive component.
按光循環器 (optical circulators)，主要係利用法拉第效應之一種光學被動元件，具有至少三個連接埠，理論上由第一埠輸入的光會由第二埠輸出，由第二埠輸入的光會由第三埠輸出，故可推論由第N埠輸入的光會由第N+1埠輸出(若第N埠為最終者則由第1埠輸出)、由第N-1埠輸入的光會由第N埠輸出。因此，光於同一路徑為不可逆，例如第二埠輸入的光不能由第一埠輸出，僅能由第三埠輸出。According to optical circulators, mainly an optical passive component utilizing the Faraday effect, having at least three ports, theoretically the light input by the first 会 is output by the second ,, and the light input by the second 埠It will be output by the third ,, so it can be inferred that the light input by the Nth 会 will be output by the N+1 ( (if the Nth is the final, it is output by the 1st )), and the light input by the N-1埠Will be output by the Nth. Therefore, the light is irreversible on the same path. For example, the light input by the second 不能 cannot be output by the first ,, and can only be output by the third 埠.
如第8圖所示，習知光循環器除具有偏光分光稜鏡91(polarizing beam splitter , 簡稱PBS)以及反射稜鏡92(reflection prism , 簡稱RP)，亦包含法拉第旋轉器93(faraday rotator , 簡稱FR)以及半波片94(half wave- plate ,簡稱H)，光由偏光分光稜鏡91分光並由反射稜鏡92反射，分成之二光路95、96，此二光路95、96透過法拉第旋轉器93以及半波片94對光產生偏振狀態的變化，令輸出的光偏振旋轉90度。As shown in FIG. 8, the conventional optical circulator has a polarization concentrating splitter 91 (PBS) and a reflection prism (RP), and also includes a faraday rotator (FR). And a half wave plate (abbreviated as H), the light is split by the polarizing beam splitter 91 and reflected by the reflecting beam 92, divided into two optical paths 95, 96, and the two optical paths 95, 96 are transmitted through the Faraday rotator 93 and the half-wave plate 94 produce a change in the polarization state of the light, causing the output light polarization to be rotated by 90 degrees.
根據類似原理，當光循環器設計趨向複雜，或是傳輸埠的數目增加時，法拉第旋轉器93以及半波片94的尺寸亦須對應地變大，因法拉第旋轉器以及半波片的價格相當昂貴，若法拉第旋轉器以及半波片必須放大尺寸，則光循環器的構件成本相對得大大的增加，造成在成本上相當大的負擔。例如在電機電子工程師學會（Institute ofElectrical andElectronicsEngineers，IEEE）所發表的一篇文章「Simplified Design of Multiport Optical Circulator With Parallel Connection of Mirror-Image Arranged Spatial- and Polarization-Modules」，其揭示一種具有6埠(port)之光循環器，若其偏光分光稜鏡及反射稜鏡與第8圖所示之光循環器為大小相同者，由於其偏光分光稜鏡及反射稜鏡共分成上下兩組，相對於第8圖所示之光循環器只有一組偏光分光稜鏡及反射稜鏡而言，法拉第旋轉器以及半波片的尺寸必然得增加至兩倍，此時法拉第旋轉器以及半波片所需耗費的構件成本相較於第8圖所示之光循環器的成本高出許多。According to a similar principle, when the design of the optical circulator tends to be complicated, or the number of transmission turns increases, the size of the Faraday rotator 93 and the half-wave plate 94 must also correspondingly become larger, since the price of the Faraday rotator and the half-wave plate is equivalent. Expensive, if the Faraday rotator and the half-wave plate have to be enlarged in size, the component cost of the optical circulator is relatively increased, resulting in a considerable burden on the cost. For example, in an article published by the Institute of Electrical and Electronics Engineers (IEEE), "Simplified Design of Multiport Optical Circulator With Parallel Connection of Mirror-Image Arranged Spatial- and Polarization-Modules", which discloses a type having 6 ports (port The optical circulator, if its polarization splitter and reflection 为 are the same size as the optical circulator shown in Figure 8, because the polarization splitter and the reflection 稜鏡 are divided into two groups, The optical circulator shown in Fig. 8 has only one set of polarized beamsplitters and reflectors. The size of the Faraday rotator and the half-wave plate must be doubled. At this time, the Faraday rotator and the half-wave plate are costly. The component cost is much higher than the cost of the optical circulator shown in Figure 8.
因此，如何解決上述習用光循環器之問題者，即為本發明之主要重點所在。Therefore, how to solve the problem of the above conventional optical circulator is the main focus of the present invention.
本發明之主要目的，在於解決上述的問題而提供一種多埠光循環器，藉由可將法拉第旋轉器及光偏振方向旋轉元件之尺寸縮小，達到構件成本降低之功效。SUMMARY OF THE INVENTION The main object of the present invention is to solve the above problems and to provide a multi-turn light circulator which can reduce the component cost by reducing the size of the Faraday rotator and the light polarization direction rotating element.
為達前述之目的，本發明係包括二光偏振元件、一法拉第旋轉器及一光偏振方向旋轉元件，光由其中一光偏振元件輸入後分為二平行之第一光路，此二第一光路由該法拉第旋轉器及光偏振方向旋轉元件分別旋轉其偏振方向45度角後由另一光偏振元件匯聚輸出，其特徵在於：For the purpose of the foregoing, the present invention includes a two-light polarizing element, a Faraday rotator, and a light polarization direction rotating element. The light is input by one of the light polarizing elements and is divided into two parallel first optical paths. Routing the Faraday rotator and the light polarization direction rotation element respectively to rotate the polarization direction by a 45 degree angle and then converge the output by another light polarization element, wherein:
以一對共焦透鏡設於其中一光偏振元件與該法拉第旋轉器之間，且以另一對相同之共焦透鏡設於另一光偏振元件與該光偏振方向旋轉元件之間，該二對共焦透鏡皆具有一第一凸透鏡分別靠近二光偏振元件，且皆具有一第二凸透鏡分別靠近該法拉第旋轉器及光偏振方向旋轉元件，同一對共焦透鏡之第一凸透鏡與第二凸透鏡二者聚焦之焦點於該二者間重疊；a pair of confocal lenses disposed between one of the light polarizing elements and the Faraday rotator, and another pair of identical confocal lenses disposed between the other of the light polarizing elements and the light polarizing direction rotating element, the second Each of the confocal lenses has a first convex lens adjacent to the two light polarizing elements, and each has a second convex lens adjacent to the Faraday rotator and the light polarization direction rotating element, and the first convex lens and the second convex lens of the same pair of confocal lenses. The focus of the two focuses on the overlap between the two;
該二第一光路經過其中一對共焦透鏡之第一凸透鏡而聚焦，再經由焦點重疊之二第二凸透鏡轉換為二平行且分光間距縮減之二第二光路輸入該法拉第旋轉器及光偏振方向旋轉元件，且二第二光路再由另一對共焦透鏡之第二凸透鏡聚焦並由焦點重疊之第一凸透鏡還原為該二第一光路後由另一光偏振元件輸出。The two first optical paths are focused by a first convex lens of the pair of confocal lenses, and then converted into two parallel and second optical paths of the splitting pitch by the second convex lens of the focus overlap, and the Faraday rotator and the polarization direction of the light are input. The rotating element is rotated, and the second optical path is further focused by the second convex lens of the other pair of confocal lenses and reduced by the first convex lens with the focus overlapping to the two first optical paths and then output by the other light polarizing element.
本發明之上述及其他目的與優點，不難從下述所選用實施例之詳細說明與附圖中，獲得深入了解。The above and other objects and advantages of the present invention will be readily understood from
當然，本發明在某些另件上，或另件之安排上容許有所不同，但所選用之實施例，則於本說明書中，予以詳細說明，並於附圖中展示其構造。Of course, the invention may be varied on certain components, or in the arrangement of the components, but the selected embodiments are described in detail in the specification and their construction is shown in the drawings.
（習用部分）(customized part)
91‧‧‧偏光分光稜鏡
92‧‧‧反射稜鏡91‧‧‧Polarized beam splitter
92‧‧‧Reflection
93‧‧‧法拉第旋轉器
94‧‧‧半波片93‧‧‧Faraday rotator
94‧‧‧Half wave plate
95‧‧‧光路
96‧‧‧光路95‧‧‧Light path
96‧‧‧Light path
（本發明部分）(part of the invention)
1‧‧‧光偏振元件
11‧‧‧偏光分光稜鏡1‧‧‧Light Polarizing Element
11‧‧‧Polarized Beam Splitter
12‧‧‧反射稜鏡
2‧‧‧光偏振元件12‧‧‧Reflection
2‧‧‧Light Polarizing Element
21‧‧‧偏光分光稜鏡
22‧‧‧反射稜鏡21‧‧‧Polarized Beam Splitter
22‧‧‧Reflection
3‧‧‧法拉第旋轉器
4‧‧‧光偏振方向旋轉元件3‧‧‧Faraday rotator
4‧‧‧Light polarization direction rotating element
5‧‧‧共焦透鏡
51‧‧‧第一凸透鏡5‧‧‧ confocal lens
51‧‧‧First convex lens
52‧‧‧第二凸透鏡
6‧‧‧共焦透鏡52‧‧‧second convex lens
6‧‧‧ confocal lens
61‧‧‧第一凸透鏡
62‧‧‧第二凸透鏡61‧‧‧First convex lens
62‧‧‧second convex lens
A‧‧‧第一光路
B‧‧‧第一光路A‧‧‧First light path
B‧‧‧First light path
C‧‧‧第二光路
D‧‧‧第二光路C‧‧‧Second light path
D‧‧‧Second light path
5A‧‧‧擴束器
51A‧‧‧凸透鏡5A‧‧•beam expander
51A‧‧‧ convex lens
52A‧‧‧凹透鏡
6A‧‧‧擴束器52A‧‧‧ concave lens
6A‧‧•beam expander
61A‧‧‧凸透鏡
62A‧‧‧凹透鏡61A‧‧‧ convex lens
62A‧‧‧ concave lens
5B‧‧‧擴束器
51B‧‧‧透鏡組5B‧‧•beam expander
51B‧‧‧Lens Group
511B‧‧‧凹透鏡
512B‧‧‧凸透鏡511B‧‧‧ concave lens
512B‧‧‧ convex lens
52B‧‧‧透鏡組
521B‧‧‧凹透鏡52B‧‧ lens group
521B‧‧‧ concave lens
522B‧‧‧凸透鏡
6B‧‧‧擴束器522B‧‧‧ convex lens
6B‧‧•beam expander
61B‧‧‧透鏡組
611B‧‧‧凹透鏡61B‧‧ lens group
611B‧‧‧ concave lens
612B‧‧‧凸透鏡
62B‧‧‧透鏡組612B‧‧‧ convex lens
62B‧‧‧Lens Group
621B‧‧‧凹透鏡
622B‧‧‧凸透鏡621B‧‧‧ concave lens
622B‧‧‧ convex lens
第1圖係本發明之第一實施例之多埠光循環器之構件組成示意圖。Fig. 1 is a schematic view showing the constitution of a multi-turn light circulator of a first embodiment of the present invention.
第2圖係本發明之第一實施例之多埠光循環器實施之其一型態示意圖。Fig. 2 is a schematic view showing a configuration of a multi-thoramic circulator according to a first embodiment of the present invention.
第3圖係本發明之第一實施例之多埠光循環器實施之另一型態示意圖。Fig. 3 is a schematic view showing another embodiment of the implementation of the multi-thin light circulator of the first embodiment of the present invention.
第4圖係本發明之第一實施例之多埠光循環器實施之又一型態示意圖。Fig. 4 is a schematic view showing still another mode of implementation of the multi-thin circulator of the first embodiment of the present invention.
第5圖係本發明之第一實施例之多埠光循環器實施之再一型態示意圖。Fig. 5 is a schematic view showing still another embodiment of the multi-thin circulator of the first embodiment of the present invention.
第6圖係本發明之第二實施例之多埠光循環器實施之型態示意圖。Fig. 6 is a schematic view showing the configuration of a multi-thoramic circulator according to a second embodiment of the present invention.
第7圖係本發明之第三實施例之多埠光循環器實施之型態示意圖。Fig. 7 is a schematic view showing the configuration of a multi-thoramic circulator according to a third embodiment of the present invention.
第8圖係習用多埠光循環器之構件組成示意圖。Figure 8 is a schematic diagram showing the composition of a conventional multi-turn light circulator.
請參閱第1圖至第7圖，圖中所示者為本發明所選用之實施例結構，此僅供說明之用，在專利申請上並不受此種結構之限制。Referring to Figures 1 through 7, the structure of the embodiment selected for use in the present invention is for illustrative purposes only and is not limited by such structure in the patent application.
本實施例提供一種多埠光循環器，其係如第1圖所示，包括一光偏振元件1、一光偏振元件2、一法拉第旋轉器3、一光偏振方向旋轉元件4、一對共焦透鏡5及一對共焦透鏡6，其中：This embodiment provides a multi-turn light circulator, which is shown in FIG. 1 and includes a light polarizing element 1, a light polarizing element 2, a Faraday rotator 3, a light polarization direction rotating element 4, and a pair of a focal lens 5 and a pair of confocal lenses 6, wherein:
如第1圖所示，該對共焦透鏡5設於光偏振元件1與該法拉第旋轉器3之間，且另一對共焦透鏡6與共焦透鏡5相同，共焦透鏡6設於光偏振元件2與該光偏振方向旋轉元件4之間，該二對共焦透鏡5、6皆具有一口徑相對較大之第一凸透鏡51、61，且皆具有一口徑相對較小之第二凸透鏡52、62，該二第一凸透鏡51、61分別靠近光偏振元件1、2，而該第二凸透鏡52靠近該法拉第旋轉器3，另該第二凸透鏡62靠近該光偏振方向旋轉元件4，該對共焦透鏡5之第一凸透鏡51與第二凸透鏡52聚焦之焦點於該第一凸透鏡51與第二凸透鏡52間重疊，且該對共焦透鏡6之第一凸透鏡61與第二凸透鏡62聚焦之焦點於該第一凸透鏡61與第二凸透鏡62間重疊。As shown in Fig. 1, the pair of confocal lenses 5 are disposed between the light polarizing element 1 and the Faraday rotator 3, and the other pair of confocal lenses 6 are the same as the confocal lens 5, and the confocal lens 6 is disposed in the light. Between the polarizing element 2 and the light polarization direction rotating element 4, the two pairs of confocal lenses 5, 6 each have a first convex lens 51, 61 having a relatively large diameter, and each has a second convex lens having a relatively small diameter. 52, 62, the two first convex lenses 51, 61 are respectively close to the light polarizing elements 1, 2, and the second convex lens 52 is close to the Faraday rotator 3, and the second convex lens 62 is adjacent to the light polarization direction rotating element 4, The focus of the first convex lens 51 and the second convex lens 52 of the confocal lens 5 is overlapped between the first convex lens 51 and the second convex lens 52, and the first convex lens 61 and the second convex lens 62 of the pair of confocal lenses 6 are focused. The focus is on the overlap between the first convex lens 61 and the second convex lens 62.
於本實施例中，該二光偏振元件1、2皆由一偏光分光稜鏡11、21及一反射稜鏡12、22構成；該光偏振方向旋轉元件4為半波片；該第一凸透鏡51、61及第二凸透鏡52、62皆為平凸透鏡，同一對共焦透鏡5、6之第一凸透鏡51、61與第二凸透鏡52、62係以凸的一面相對。In this embodiment, the two light polarizing elements 1 and 2 are composed of a polarizing beam splitter 11 and 21 and a reflecting beam 12, 22; the light polarization direction rotating element 4 is a half wave plate; the first convex lens The 51, 61 and second convex lenses 52, 62 are all plano-convex lenses, and the first convex lenses 51, 61 of the same pair of confocal lenses 5, 6 and the second convex lenses 52, 62 are opposed to each other with a convex side.
如第2圖所示，光係由光偏振元件1的左側以水平方向進入，且由偏振元件1分為二平行之第一光路A、B，依序經過該對共焦透鏡5、法拉第旋轉器3、光偏振方向旋轉元件4、及該對共焦透鏡6，此二第一光路A、B在經由該法拉第旋轉器3及光偏振方向旋轉元件4之後分別旋轉其偏極狀態正45度角，共以旋轉90度之偏振角度由該光偏振元件2匯聚而以水平方向輸出，此為光循環器於實施時之一種型態。其中，符號⊕ 表示以非偏振光輸入或輸出之光源、⊖ 表示偏振方向為水平之P偏振光、ⓛ表示偏振方向為垂直之S偏振光。As shown in FIG. 2, the light system enters in the horizontal direction from the left side of the light polarizing element 1, and is divided into two parallel first optical paths A and B by the polarizing element 1, and sequentially passes through the pair of confocal lenses 5 and Faraday rotation. 3, the light polarization direction rotation element 4, and the pair of confocal lenses 6, the first optical paths A, B are respectively rotated by 45 degrees after the polarization state of the rotation element 4 through the Faraday rotator 3 and the light polarization direction The angles are collectively distributed by the light polarizing element 2 at a polarization angle of 90 degrees and output in a horizontal direction, which is a type in which the optical circulator is implemented. Here , the symbol ⊕ indicates a light source that is input or outputted with unpolarized light, ⊖ indicates P-polarized light whose polarization direction is horizontal, and l indicates S-polarized light whose polarization direction is vertical.
承上，光由光偏振元件1輸入至由光偏振元件2匯聚輸出的過程中，該二第一光路經過該對共焦透鏡5之第一凸透鏡51而聚焦，再經由焦點重疊之第二凸透鏡52轉換為二平行且分光間距縮減之第二光路C、D輸入該法拉第旋轉器3及光偏振方向旋轉元件4，且二第二光路C、D再由另一對共焦透鏡6之第二凸透鏡62聚焦並由焦點重疊之第一凸透鏡61還原為該二第一光路A、B後由光偏振元件2輸出。In the process of inputting light from the light polarizing element 1 to the output of the light polarizing element 2, the two first light paths are focused by the first convex lens 51 of the pair of confocal lenses 5, and then the second convex lens is overlapped by the focus. The second optical paths C, D converted into two parallel and splitting pitches are input to the Faraday rotator 3 and the light polarization direction rotating element 4, and the second second optical paths C, D are further divided by the second pair of confocal lenses 6. The convex lens 62 is focused and reduced by the first convex lens 61 whose focus is overlapped to the two first optical paths A and B, and then output by the light polarizing element 2.
如第3圖所示，光係由光偏振元件2的右側以水平方向進入，且由偏振元件2分為二平行之第一光路A、B，依序經過該對共焦透鏡6及該對共焦透鏡5之後，進入光偏振元件1。在經過光偏振方向旋轉元件4、法拉第旋轉器3時，分別旋轉其偏極狀態負45度角與正45度角，共以旋轉0度之偏振角度後，經過該對共焦透鏡5進入光偏振元件1，經匯聚而以垂直方向往下輸出，此為光循環器於實施時之另一種型態。As shown in FIG. 3, the light system enters in the horizontal direction from the right side of the light polarizing element 2, and is divided into two parallel first optical paths A, B by the polarizing element 2, sequentially passing through the pair of confocal lenses 6 and the pair. After the confocal lens 5, the light polarizing element 1 is entered. When passing through the light polarization direction rotating element 4 and the Faraday rotator 3, respectively, the polar state is rotated by a negative 45 degree angle and a positive 45 degree angle, and after rotating at a polarization angle of 0 degrees, the pair of confocal lenses 5 enter the light. The polarizing element 1 is concentrated and output downward in the vertical direction, which is another type of implementation of the optical circulator.
如第4圖所示，光係由光偏振元件1的下方以垂直方向朝上進入，且由偏振元件1分為二平行之第一光路A、B，依序經過該對共焦透鏡5、法拉第旋轉器3、光偏振方向旋轉元件4、及該對共焦透鏡6之後，以偏振狀態旋轉90度之偏振角度由該光偏振元件2以垂直方向朝上輸出，此為光循環器於實施時之又一種型態。As shown in FIG. 4, the light system enters vertically downward from the lower side of the light polarizing element 1, and is divided into two parallel first optical paths A and B by the polarizing element 1, sequentially passing through the pair of confocal lenses 5, After the Faraday rotator 3, the light polarization direction rotation element 4, and the pair of confocal lenses 6, the polarization angle rotated by 90 degrees in the polarization state is output upward by the light polarization element 2 in the vertical direction, which is implemented by the optical circulator. Another type of time.
如第5圖所示，光係由光偏振元件2的上方以垂直方向朝下進入，且由偏振元件2分為二平行之第一光路A、B，依序經過該對共焦透鏡6、光偏振方向旋轉元件4、法拉第旋轉器3、及該對共焦透鏡5之後，進入光偏振元件1。在經過光偏振方向旋轉元件4、法拉第旋轉器3時，分別旋轉其偏極狀態負45度角與正45度角，共以旋轉0度之偏振角度後，經過該對共焦透鏡5進入光偏振元件1，經匯聚而以水平方向輸出，此為光循環器於實施時之再一種型態。As shown in FIG. 5, the light system enters downward from the upper side of the light polarizing element 2 in a vertical direction, and is divided into two parallel first optical paths A and B by the polarizing element 2, sequentially passing through the pair of confocal lenses 6, The light polarization direction rotation element 4, the Faraday rotator 3, and the pair of confocal lenses 5 enter the light polarization element 1. When passing through the light polarization direction rotating element 4 and the Faraday rotator 3, respectively, the polar state is rotated by a negative 45 degree angle and a positive 45 degree angle, and after rotating at a polarization angle of 0 degrees, the pair of confocal lenses 5 enter the light. The polarizing element 1 is concentrated and output in a horizontal direction, which is another type of implementation of the optical circulator.
由上述之說明不難發現本發明之優點，在於利用該對共焦透鏡5或該對共焦透鏡6將二平行之第一光路A、B轉換為分光間距縮減之第二光路C、D，此時由於第二光路C、D由法拉第旋轉器3以及光偏振方向旋轉元件4輸入之範圍縮小，爾後經由該對共焦透鏡5或該對共焦透鏡6再將第二光路C、D還原為第一光路A、B，致使法拉第旋轉器3以及光偏振方向旋轉元件4之尺寸不必與光偏振元件1、2對應，亦即法拉第旋轉器3以及光偏振方向旋轉元件4縮小尺寸仍可由該二對共焦透鏡5、6之設置而同樣達到光偏振之效果，藉此達到構件成本降低之功效。It is not difficult to find the advantages of the present invention by the above description, in that the pair of confocal lenses 5 or the pair of confocal lenses 6 are used to convert the two parallel first optical paths A, B into the second optical paths C, D whose spectral spacing is reduced. At this time, since the range in which the second optical paths C and D are input by the Faraday rotator 3 and the light polarization direction rotating element 4 is reduced, the second optical paths C and D are then restored via the pair of confocal lenses 5 or the pair of confocal lenses 6. For the first optical paths A, B, the size of the Faraday rotator 3 and the light polarization direction rotating element 4 does not have to correspond to the light polarizing elements 1, 2, that is, the Faraday rotator 3 and the light polarization direction rotating element 4 can be reduced in size. The arrangement of the two pairs of confocal lenses 5, 6 also achieves the effect of light polarization, thereby achieving the effect of reducing the component cost.
當然，本創作仍存在許多例子，其間僅細節上之變化。請參閱第6圖，其係本創作之第二實施例，其中與第一實施例之主要差異，在於本實施例係以一擴束器5A(beam expander)設於光偏振元件1與該法拉第旋轉器3之間，且以另一相同之擴束器6A(beam expander)反向地設於光偏振元件2與該光偏振方向旋轉元件4之間，該二第一光路A、B經過該擴束器5A而轉換為二平行且分光間距縮減之第二光路C、D輸入該法拉第旋轉器3及光偏振方向旋轉元件4，且二第二光路C、D再由該擴束器6A還原為該二第一光路A、B後由該光偏振元件2輸出。Of course, there are still many examples of this creation, only the details change. Please refer to FIG. 6, which is a second embodiment of the present invention, wherein the main difference from the first embodiment is that the present embodiment is provided with a beam expander 5A (beam expander) disposed on the light polarizing element 1 and the Faraday. Between the rotators 3, and in another opposite beam expander 6A (beam expander) is disposed between the light polarizing element 2 and the light polarization direction rotating element 4, the two first light paths A, B pass through the The second beam path C, D converted into two parallel and splitting pitches is input to the Faraday rotator 3 and the light polarization direction rotating element 4, and the second light paths C, D are further reduced by the beam expander 6A. The two first optical paths A and B are output from the light polarizing element 2.
於本實施例中，二擴束器5A、6A皆具有一凸透鏡51A、61A分別靠近光偏振元件1、2，且皆具有一凹透鏡52A、62A分別靠近該法拉第旋轉器3及光偏振方向旋轉元件4。In the present embodiment, the two beam expanders 5A, 6A each have a convex lens 51A, 61A adjacent to the light polarizing elements 1, 2, respectively, and each has a concave lens 52A, 62A adjacent to the Faraday rotator 3 and the light polarization direction rotating element, respectively. 4.
藉由該二擴束器5A、6A取代第一實施例之共焦透鏡5、6，亦可達到與第一實施例相同之功效。By replacing the confocal lenses 5, 6 of the first embodiment with the two beam expanders 5A, 6A, the same effects as those of the first embodiment can be achieved.
請參閱第7圖，其係本創作之第三實施例，其中與第二實施例之主要差異，二擴束器5B、6B(beam expander)皆具有一透鏡組51B、61B分別靠近光偏振元件1、2，且皆具有另一透鏡組52B、62B分別靠近該法拉第旋轉器3及光偏振方向旋轉元件4，透鏡組51B包括二凹透鏡511B及一凸透鏡512B，透鏡組52B包括二凹透鏡521B及一凸透鏡522B，透鏡組61B包括二凹透鏡611B及一凸透鏡612B，透鏡組62B包括二凹透鏡621B及一凸透鏡622B，以透鏡組51B為例(透鏡組52B、61B、62B亦同)，該凸透鏡512B被二凹透鏡511B包夾，即該凸透鏡512B於二凸的一面被二凹透鏡511B於凹的一面以對應曲率貼附。Please refer to FIG. 7 , which is a third embodiment of the present invention. In the main difference from the second embodiment, the two beam expanders 5B and 6B each have a lens group 51B and 61B respectively adjacent to the light polarization element. 1 and 2, and each has another lens group 52B, 62B adjacent to the Faraday rotator 3 and the light polarization direction rotating element 4, the lens group 51B includes a concave lens 511B and a convex lens 512B, and the lens group 52B includes a concave lens 521B and a lens The convex lens 522B, the lens group 61B includes a concave lens 611B and a convex lens 612B. The lens group 62B includes a concave lens 621B and a convex lens 622B. The lens group 51B is taken as an example (the same lens group 52B, 61B, 62B), and the convex lens 512B is The concave lens 511B is sandwiched, that is, the convex lens 512B is attached to the concave side of the concave lens 511B on the concave side by a corresponding curvature.
藉由該二擴束器5B、6B取代第二實施例之擴束器5A、6A，亦可達到與第一、二實施例相同之功效。By replacing the beam expanders 5A, 6A of the second embodiment with the two beam expanders 5B, 6B, the same effects as those of the first and second embodiments can be achieved.
以上所述實施例之揭示係用以說明本發明，並非用以限制本發明，故舉凡數值之變更或等效元件之置換仍應隸屬本發明之範疇。The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.
由以上詳細說明，可使熟知本項技藝者明瞭本發明的確可達成前述目的，實已符合專利法之規定，爰提出專利申請。From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objects and is in accordance with the provisions of the Patent Law.
1‧‧‧光偏振元件 1‧‧‧Light Polarizing Element
11‧‧‧偏光分光稜鏡 11‧‧‧Polarized Beam Splitter
12‧‧‧反射稜鏡 12‧‧‧Reflection
2‧‧‧光偏振元件 2‧‧‧Light Polarizing Element
21‧‧‧偏光分光稜鏡 21‧‧‧Polarized Beam Splitter
22‧‧‧反射稜鏡 22‧‧‧Reflection
3‧‧‧法拉第旋轉器 3‧‧‧Faraday rotator
4‧‧‧光偏振方向旋轉元件 4‧‧‧Light polarization direction rotating element
5‧‧‧共焦透鏡 5‧‧‧ confocal lens
51‧‧‧第一凸透鏡 51‧‧‧First convex lens
52‧‧‧第二凸透鏡 52‧‧‧second convex lens
6‧‧‧共焦透鏡 6‧‧‧ confocal lens
61‧‧‧第一凸透鏡 61‧‧‧First convex lens
62‧‧‧第二凸透鏡 62‧‧‧second convex lens
Claims (9)
以一對共焦透鏡設於其中一光偏振元件與該法拉第旋轉器之間，且以另一對相同之共焦透鏡反向地設於另一光偏振元件與該光偏振方向旋轉元件之間，該二對共焦透鏡皆具有一第一凸透鏡分別靠近二光偏振元件，且皆具有一第二凸透鏡分別靠近該法拉第旋轉器及光偏振方向旋轉元件，同一對共焦透鏡之第一凸透鏡與第二凸透鏡二者聚焦之焦點於該二者間重疊；
該二第一光路經過其中一對共焦透鏡之第一凸透鏡而聚焦，再經由焦點重疊之第二凸透鏡轉換為二平行且分光間距縮減之第二光路輸入該法拉第旋轉器及光偏振方向旋轉元件，且二第二光路再由另一對共焦透鏡之第二凸透鏡聚焦並由焦點重疊之第一凸透鏡還原為該二第一光路後由另一光偏振元件輸出。A multi-turn light circulator comprising at least two light polarizing elements, a Faraday rotator and a light polarization direction rotating element, wherein the light is input by one of the light polarizing elements and is divided into two parallel first optical paths, the two first optical routes The Faraday rotator and the light polarization direction rotation element respectively rotate their polarization directions by 45 degrees and then converge and output by another light polarization element, which is characterized by:
A pair of confocal lenses are disposed between one of the light polarizing elements and the Faraday rotator, and another pair of identical confocal lenses are oppositely disposed between the other of the light polarizing elements and the light polarizing direction rotating element The two pairs of confocal lenses each have a first convex lens adjacent to the two light polarizing elements, and each has a second convex lens adjacent to the Faraday rotator and the light polarization direction rotating element, and the first convex lens of the same pair of confocal lenses The focus of the second convex lens is focused on the overlap between the two;
The two first optical paths are focused by a first convex lens of a pair of confocal lenses, and then converted into a two-parallel and second optical path with a reduced spectral spacing through a second convex lens with overlapping focal points, and the Faraday rotator and the light polarization direction rotating element are input. And the second optical path is further focused by the second convex lens of the other pair of confocal lenses and reduced by the first convex lens with the focus overlapping to the two first optical paths and then output by the other light polarizing element.
以一擴束器設於其中一光偏振元件與該法拉第旋轉器之間，且以另一相同之擴束器反向地設於另一光偏振元件與該光偏振方向旋轉元件之間，該二第一光路經過其中一擴束器而轉換為二平行且分光間距縮減之第二光路輸入該法拉第旋轉器及光偏振方向旋轉元件，且二第二光路再由另一擴束器還原為該二第一光路後由另一光偏振元件輸出。A multi-turn light circulator comprising at least two light polarizing elements, a Faraday rotator and a light polarization direction rotating element, wherein the light is input by one of the light polarizing elements and is divided into two parallel first optical paths, the two first optical routes The Faraday rotator and the light polarization direction rotation element respectively rotate their polarization directions by 45 degrees and then converge and output by another light polarization element, which is characterized by:
Providing a beam expander between one of the light polarizing elements and the Faraday rotator, and oppositely disposed between the other light polarizing element and the light polarizing direction rotating element by another identical beam expander, The second optical path is converted into two parallel and the second optical path of the splitting pitch is input into the Faraday rotator and the light polarization direction rotating element, and the second optical path is further reduced by the other beam expander to the second optical path. The two first optical paths are then output by another light polarizing element.
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| US7826137B2 (en) * | 2006-03-09 | 2010-11-02 | Namiki Seimitsu Houseki Kabushiki Kaisha | Reflective optical circulator |
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| TW524992B (en) * | 1998-10-27 | 2003-03-21 | Adc Telecommunications Inc | Multiple port, fiber optic coupling device |
| TW476009B (en) * | 2001-03-27 | 2002-02-11 | Ind Tech Res Inst | Optical circulator with 3-port |
| US20020191284A1 (en) * | 2001-06-13 | 2002-12-19 | Kok-Wai Chang | Optical circulator |
| CN1190676C (en) * | 2001-08-31 | 2005-02-23 | 林先锋 | Optical circulator and its polarized light circulating device |
| US7826137B2 (en) * | 2006-03-09 | 2010-11-02 | Namiki Seimitsu Houseki Kabushiki Kaisha | Reflective optical circulator |
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