CN2450679Y - 一种光学结构 - Google Patents

一种光学结构 Download PDF

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Publication number
CN2450679Y
CN2450679Y CN00240875U CN00240875U CN2450679Y CN 2450679 Y CN2450679 Y CN 2450679Y CN 00240875 U CN00240875 U CN 00240875U CN 00240875 U CN00240875 U CN 00240875U CN 2450679 Y CN2450679 Y CN 2450679Y
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light
prism
optical
optical texture
optical structure
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Expired - Fee Related
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CN00240875U
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吴砺
凌吉武
詹翠莲
林守锋
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Casix Inc
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Casix Inc
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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
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29302—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means based on birefringence or polarisation, e.g. wavelength dependent birefringence, polarisation interferometers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • 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
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
    • G02B6/2773—Polarisation splitting or combining
    • 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
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
    • G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
    • G02B6/272—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations comprising polarisation means for beam splitting and combining

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

本实用新型涉及光通讯领域光无源器件中,代替大块晶体的光学结构,由一对渥拉斯顿棱镜、一个屋脊棱镜、另一对渥拉斯顿棱镜或一个单楔角棱镜配合组成,可将平行光分解为相互平行寻常光和异常光的功能,具有总体价格低的特点,有很大的经济价值。

Description

一种光学结构
本实用新型涉及光通讯领域，尤其是指光无源器件中的光学结构。
随着光纤通讯对无源器件大量需求，对大尺寸光学晶体需求亦急剧增加，特别是在光学环行器，Interleaver器件等器件的主流方案中，均采用多块大尺寸晶体的光学结构，如图1所示。两面相互平行长方形晶体，将从准直器出射平行光分解为互相平行的寻常光(o光)和异常光(e光)，而且通常要求o光与e光在空间分开，并保证一定间隙，这样分解出的o光、e光再分别在光路上插入波片或法那第旋转片两束光产生同方向偏振光以实现其它功能。为保证分别这些插入o光，e光光路元件不引起附加损耗，通常这些晶体长度较长，如用NSG公司SLW-1.8制作准直器产生平行光，通常采用晶体长度在6.5mm到十几mm不等。同样，这些器件亦采用同样晶体对分解开的两束同偏振方向的光加波片或法那第旋转片，重新变为o光，e光重新合束再进入光纤准直器，其光路只需采用图一光路利用光逆性即可实现。由于适用于这种无源器件晶体大多采用纯钒酸钇(YVO4)或金红石等晶体，其o光、e光折射率相差大，光学质量好，但价格昂贵的晶体，使这类器件成本较高，总体价格难以下降，从而影响了这类高性能器件更广泛的应用。
本实用新型的目的在于提供一组尺寸较小的晶体、结构简单的器件来代替大块晶体的光学结构。
本实用新型的技术方案可以这样实现：
一种光学结构，由一对渥拉斯顿棱镜和一个可将渥拉斯顿棱镜分解的o光、e光重新校准为相互平行光束的棱镜构成，且两者粘接在同一玻璃平片或金属片上。该棱镜可以为一个屋脊棱镜或另一对渥拉斯顿棱镜或一个单楔角棱镜。
本实用新型有效地减小光学环行器、Interleaver中晶体尺寸，用棱镜组来代替大块晶体，价格下降，具有很大的经济价值。
现结合实施例及附图详细说明如下：
图1已有技术晶体结构示意图。
图2本实用新型光学结构示意图。
图3是本实用新型另一光学结构示意图。
图4是本实用新型又一光学结构示意图。
图5是本实用新型采用渥拉斯顿棱镜的另一种实施示意图。
图6是本实用新型具体结构图。
图7是本实用新型图6的俯视图。
本专利采用最小的晶体材料实现上述长方形晶体块功能，并可应用于环形器、Interleaver、开关等器件之中，如图2所示，101与102两块晶体光轴相互正交的楔角片构成的屋拉斯顿棱镜，103为一片普通光学材料构成屋脊形棱镜。101与102将一束光分解为o光e光，其o光与e光夹角为θ=θ1+θ2，其中θ1、θ2角与角α之间关系为： θ 1 = sin - 1 { n 0 sin [ sin - 1 ( n e sin α n 0 - α ) ] } θ 2 = sin - 1 { n e sin [ α - sin - 1 ( n 0 sin α n e ) ] } 设ne＞no屋拉斯顿棱镜楔角为α，其o光折射率no,e光折射率为ne,θ1、θ2分别为e光与o光入射光夹角。由于一般因为α角均在适当范围，防止引入较大的偏振相关损耗，而屋脊棱镜则将夹角为θ光束o光，e光再校准为相互平行光束，该平行光束可与入射光进入屋拉斯特棱镜之前光束成一定夹角，一般取该平行光来与入射光平行。此时若取e光与入射光夹角为θ1；o光与入射夹角为θ2，此时棱镜，相应的楔角则为： β 1 = arctg [ sin θ 1 n cos ( arcsin ( sin θ 1 n ) - 1 ) ] β 2 = arctg [ sin θ 2 n cos ( arcsin ( sin θ 2 n ) - 1 ) ]
棱镜103亦可为一楔角棱镜(图3所示)，但这种结构光程不一致而且偏离入射光方向。
本专利在实际应用时，如图6、图7所示，渥拉斯通棱镜601、602与棱镜604粘结在同一个玻璃平片上(或金属片)603上。如图2所示，通过调节，渥拉斯顿101棱镜和棱镜103之间间隔L，改变o光与e光分离距离d。理论上可得出使两光束完全空间分离的任何尺寸d，严格控制L，可得到在光无源器件需要的精度范围d，这样可获得e光和o光分离间隔d相同的批量元件。
本专利亦可采用两对渥拉斯顿棱镜401、402与403、404实现其功能。如图4所示，401和402为光轴相互垂直的渥拉斯顿棱镜，与渥拉斯顿棱镜403、404楔角相同，但先后对应晶体光轴位置相互垂直另一对渥拉斯顿棱镜。该方案优点两束光因为没有光学棱镜中间棱线，应用中两束光部分可以重叠状态。
采用本实用新型的光学结构，根据光路可逆原理，同样可将两束相互平行但偏振方向垂直的光束合为一束光。

Claims (5)

1．一种光学结构，其特征在于：它由一对渥拉斯顿棱镜和一个可将渥拉斯顿棱镜分解的o光和e光重新校准为相互平行光束的棱镜构成，且两者粘结在同一基片上。
2．根据权利要求1所述的一种光学结构，其特征在于：所述的棱镜可以为一个屋脊棱镜。
3．根据权利要求1所述的一种光学结构，其特征在于：所述的棱镜可以为另一个屋拉斯顿棱镜。
4．根据权利要求1所述的一种光学结构，其特征在于：所述的棱镜可以为一个单楔角棱镜。
5．根据权利要求1所述的一种光学结构，其特征在于：所述的基片为玻璃平片或金属片。
CN00240875U 2000-11-03 2000-11-03 一种光学结构 Expired - Fee Related CN2450679Y (zh)

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CN00240875U CN2450679Y (zh) 2000-11-03 2000-11-03 一种光学结构
US10/003,017 US20020109918A1 (en) 2000-11-03 2001-11-02 Polarization beam splitter/combiner

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102854564A (zh) * 2012-09-11 2013-01-02 华中科技大学 一种具有对称结构的四端口光环行器
CN103576240A (zh) * 2012-10-08 2014-02-12 叶小华 紧凑型四端口光环行器
CN104685406A (zh) * 2012-08-20 2015-06-03 贰陆公司 光束合成器及合成器消偏振镜

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060228717A1 (en) * 2005-04-08 2006-10-12 Joyce Timothy H Microfluidic system and method of utilization
CN102411161B (zh) * 2011-12-09 2013-05-08 中国科学院上海光学精密机械研究所 线起偏器
DE102014116687A1 (de) 2014-11-14 2016-05-19 Osram Opto Semiconductors Gmbh Optoelektronisches Bauelement und Beleuchtungsvorrichtung
US9478930B1 (en) * 2015-08-31 2016-10-25 Raytheon Company Walk-off pump coupler
US10469195B2 (en) * 2017-10-12 2019-11-05 Luxtera, Inc. Method and system for eliminating polarization dependence for 45 degree incidence MUX/DEMUX designs

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104685406A (zh) * 2012-08-20 2015-06-03 贰陆公司 光束合成器及合成器消偏振镜
CN104685406B (zh) * 2012-08-20 2017-09-01 福州高意通讯有限公司 光束合成器及合成器消偏振镜
CN102854564A (zh) * 2012-09-11 2013-01-02 华中科技大学 一种具有对称结构的四端口光环行器
CN103576240A (zh) * 2012-10-08 2014-02-12 叶小华 紧凑型四端口光环行器

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