CN1094819A - 带有可弯曲管的光纤盒体 - Google Patents
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- CN1094819A CN1094819A CN94103205.1A CN94103205A CN1094819A CN 1094819 A CN1094819 A CN 1094819A CN 94103205 A CN94103205 A CN 94103205A CN 1094819 A CN1094819 A CN 1094819A
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- 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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
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Abstract
一种盒体,包括将管束之一末端固定在盒体上的
装置,还包括使管束之末端固定成一稳定的几何结构
的固化粘合剂,所述几何结构用来承受将造成通过光
纤传输之光信号的曲率损耗的机械弯曲。
一盒体的应用,该盒体包括一用作带有光纤的电
信网络的集成光学元件。
Description
本发明涉及光纤装置用的盒体,尤其涉及这样一种盒体,它带有一束可保护由盒体中延伸出来的光纤的管子,还带有用来将该束管子之一端固定在盒体上的装置。
为了安装光纤电信网络,建议使用附图1所示型式的盒体。盒体1可用来保护并处置一光学元件2,所述元件可以是例如一集成光学中的1×N耦合器。
如图1的局部剖视图所示,从耦合器之一边延伸出的光纤3和从该耦合器之另一边延伸出的N根光纤4被沿着预定曲率的路径导向(N+1)根管子的束6的端部5,其中每一根均对由盒体中延伸出来的一根光纤之一部分进行保护。
同时,为了使加在保护管或光纤上的张力不致于破坏管束/盒体的固定连接或不致于使元件2在盒体中移动,应确保保护管束的末端5固定在盒体上并确保每根光纤固定在各自的保护管中。
如附图2之示意图所表明的那样。该图示出了光纤之末端的纵向段,图中,例如将一滴粘合剂7滴在管口并由毛细管吸引作用将其引入管内从而使光纤3被固定在其保护管中。
为了将一束保护管固定在盒体上,将一可弯曲保护套8穿过管束的末端,将一个或多个固定带91,92(图1)绕过管束末端且围绕于形成盒体中并为管束确定一通道的壁101,102,并将这些固定带围绕该管束及壁收紧。
使由这种方式构成的盒体经受标准的加热/冷却循环以证实当其处于例如包括在-40℃至85℃间的任一外界温度下是否具有适当的工作能力。在这些试验进行时,对通过元件的光信号损耗进行监测。在这些试验进行期间,人们注意到上文所述的保护固定管束的结构会产生损耗,这在低温(-40℃)时尤为显著。事实上,如图2所示,例如在粘合剂滴7和固定带91间的保护管在低温时的收缩会引起光纤3厉害的局部微曲,从而导致光信号的严重损耗,对于一标准波长为1550nm的信号而言,该损耗一般会达到1dB。
因此,本发明的目的在于提供一种上述型式的盒体,为了在上文所提及的机端温度条件下尽量不提高制造成本而消除由盒体所引起的曲率损耗,本发明对该盒体进行了改进。
根据本发明,盒体包括使保护管束之末端固定在盒体上的装置,和一用来承受可引起经光纤传输的光信号之曲率损耗的机械弯曲的一合适的稳定几何结构。
根据本发明提供的一种较佳方式,该稳定几何结构的形式为把保护管以密集形式任意叠放在平面底座层中,采用一固化的粘合剂填满管间空隙以固定该结构。
通过阅读下文的描述并仔细观察附图将对本发明的其它特征及优点有所了解。其中:
图1和2是上述技术的示意图。
图3至5是三种管束末端结构的横截面图,可根据本发明在盒体中使用这三种结构。
图6以曲线图形式示出了施加在盒体上的加热/冷却循环,并示出了根据本发明传输通过安装在盒体中的一耦合器之光信号的衰减。
参见附图3至5,尤其参见图4,它示出了互相紧靠被装入一保护套8中的一束可弯曲保护管111、112、113、114、115末端的横截面图,且所述可弯曲管分别对光纤41、42、3、43、44起到保护作用。其中之每一根光纤均可活动自如地通过相应的可弯曲保护管。这种结构相应于一带有1×4耦合器的盒体,例如,在集成光学中,此五根光纤在通过沿着盒体内部的低曲率通道(图1中未示出)延伸出来之后一同连接至耦合器上,所述低曲率通道可减小在这些通道上的曲率损耗。
根据本发明,所述五根光纤被分配在分别带有两根和三根保护管的两个叠放的平面层上。通过使用一固化粘合剂的包层填满管间的所有间隙来固定该结构。
为了达到这一目的,用一滴预定量的液态粘合剂来包覆管束的末端,这种粘合剂随后自动地进入管间,且在它固化后可确保以这种方式构成之保护管的密集型结构的结合。随后把这一结构固定成在横向和纵向上均稳定的几何形状。
可采用各种固化粘合剂来达到此效果,尤其可采用快速固化的氰基丙烯酸树脂的粘合剂。
可随意地将以这种方式固定的管束末端插入一粘合在此末端上的塑料可弯曲保持套8中,这可使用例如与用来将保护管粘合在一起的粘合剂相同的产品来达到这一目的。
随后使光学元件2的各光纤插入保护管11i(i=1至5)的末端中并使用一合适的粘合剂滴7对其进行粘合,所述粘合剂如上所述通过毛细管吸引作用而进入保护管。由于仅作为图示,光纤可以是“单模”的且其直径为0.25mm,相应的保护管111的内径为0.5mm,外径约为1mm。
随后把管束末端5粘合在盒体底部的表面12上。所述盒体以两盒体壁101,102为支持壁,它们在该底面上为所述末端确定了一空间。根据本发明,表面12大致为平面,其上没有凹痕,从而可避免管束与承受表面间的任何集中力点。
为了使末端更好地固定在盒体上,将一根或更多根固定带91、92紧紧围绕管束末端以及盒体壁101、102并收紧,由于显著地增强其抵抗垂直于底面12的拉出力的能力故能实现这一目的。
本发明所实现的管束末端的固定具有出人意料的优点。它使得管束承受了由固定带施加的将导致光纤微曲率的压力。在这一点上,可通过适当选择盒体壁101、102的高度尺寸以使固定带与管束齐平来再次减小压力。在任一种情况下,为了确保更好地分配压力,宜使用如图2中所示的平面固定带。显然,根据本发明所实现的管束末端之固定可以让我们避免那种压力完全被直接面对每一固定带的保护吸收的可能性,相反地,这些压力在聚成整体的管束末端内分散,从而减小了管束末端每一点上的应变。
图3和5中示出了适用于分别带有1×2和1×8耦合器的盒体之本发明的其它实施例。它们具有以上详述的在图4中部分示出的带有1×4耦合器之盒体的所有特征,在不同的实施例中仅是每一层上保护管数目各不相同。使用上文所揭示的原理,可以将本发明推广至其它型式的集成光学元件,例如邻接型耦合器或也可是经典的-非集成光学的-光学元件。
如上所述,光纤应通过在保护管束末端和光学元件2之间的小曲率通道从而精确地限制曲率损耗。从这点上讲,不强使光纤按所述元件的方向而保护管的末端,而使之接着通过的那部分通道曲率小并尽可能接近于直线的做法是合适的。
图6示出了采用本发明所得到的效果。用连续线来表示盒体的加热/冷却循环:它们包括了四个起始循环,其温度在-20℃和+50℃间变化,随之是10个循环,其温度在-40℃和+85℃间变化,整个过程持续126小时。
对根据图5制得的盒体进行测试,使用本技术领域内众所周知的测量和记录装置来监测在盒体内光学元件2之八根光纤4i的每个末端上从光纤输出之光信号衰减量的变化。显然,此光信号是通过由耦合器2来传输由光纤3直接导入耦合器的波长为1550nm的部分光信号而得到的。
以虚线表示了在八根光纤之末端监测得的各衰减量的分贝值。可以看到它们保持在-0.2dB和+0.2dB之间。这些插损(其中的相当一部分来自管束之末端5的微曲率损耗)被认为是可以承受的,并在上述波长下与未采用本发明进行改进之盒体中的1dB的损耗相比较。
尽管以硬管代替可弯曲管可减小曲率,但与可弯曲管相比,它们更难以处置且更为昂贵。本发明所采用的方法在低成本且能更好地进行处置的条件下实现了同样的效果。
本发明并不局限于在这里仅用作举例而描述并提出的实施例,因此本发明可推广至将保护管内的一束光纤固定在任一支持体上;从一盒形的支持物至含有任何种类带光纤之光学元件的盒体,且并不局限于集成光学元件。
Claims (8)
1、一种用于光纤装置的盒体,它带有一束用来保护从盒体(1)中延伸出来的光纤(3,4i)的可弯曲管(11i),且带有将该管束之末端固定在盒体上的装置,其特征在于,它包括一使所述管束末端固定成一稳定的几何结构的装置,所述几何结构用来承受将引起通过光纤传输之光信号的曲率损耗的机械弯曲。
2、如权利要求1所述的盒体,其特征在于,这一稳定结构采用随意叠置在一平面层上之保护管(11i)的密集型结构的形式。
3、如权利要求1或2所述的盒体,其特征在于,用一固化的粘合剂(13)填满保护管(11i)间的间隙来构成所述的固定装置。
4、如权利要求1至3中任一项所述的盒体,其特征在于,用粘合剂滴(7)在管束(6)之末端处将每一光纤(3,4i)固定在其保护管(11i)内。
5、如权利要求1至4中任一项所述的盒体,其特征在于,管束末端(5)被插入一保护套(8)中,所述套之内部粘在管束上,其外部粘在盒体(1)之一预定表面(12)上。
6、如权利要求5所述的盒体,其特征在于,表面(12)大致呈平面且不带有任何凹痕。
7、如权利要求1至6中之任一项所述的盒体,其特征在于,平面的固定窄带(9i)中至少一根靠在导管束(6)末端之已固定的平面表面上从而使所述末端无需弯曲便固定在盒体上。
8、如权利要求7所述的盒体,其特征在于,这些固定带(9i)贴在盒体壁(101,102)上从而使之与管束(6)之末端的表面齐平。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9303523 | 1993-03-26 | ||
FR9303523A FR2703160B1 (fr) | 1993-03-26 | 1993-03-26 | Cassette pour dispositif à fibres optiques, équipée d'un faisceau de tubes souples de protection des fibres. |
Publications (1)
Publication Number | Publication Date |
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CN1094819A true CN1094819A (zh) | 1994-11-09 |
Family
ID=9445394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN94103205.1A Pending CN1094819A (zh) | 1993-03-26 | 1994-03-25 | 带有可弯曲管的光纤盒体 |
Country Status (7)
Country | Link |
---|---|
US (1) | US5438641A (zh) |
EP (1) | EP0617305A1 (zh) |
JP (1) | JPH075350A (zh) |
CN (1) | CN1094819A (zh) |
AU (1) | AU675275B2 (zh) |
CA (1) | CA2116926A1 (zh) |
FR (1) | FR2703160B1 (zh) |
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-
1993
- 1993-03-26 FR FR9303523A patent/FR2703160B1/fr not_active Expired - Fee Related
-
1994
- 1994-02-22 US US08/199,084 patent/US5438641A/en not_active Expired - Lifetime
- 1994-03-03 CA CA002116926A patent/CA2116926A1/en not_active Abandoned
- 1994-03-21 EP EP94104405A patent/EP0617305A1/en not_active Withdrawn
- 1994-03-21 AU AU57931/94A patent/AU675275B2/en not_active Expired - Fee Related
- 1994-03-24 JP JP6076418A patent/JPH075350A/ja active Pending
- 1994-03-25 CN CN94103205.1A patent/CN1094819A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
AU5793194A (en) | 1994-09-29 |
JPH075350A (ja) | 1995-01-10 |
FR2703160B1 (fr) | 1995-06-02 |
US5438641A (en) | 1995-08-01 |
CA2116926A1 (en) | 1994-09-27 |
AU675275B2 (en) | 1997-01-30 |
EP0617305A1 (en) | 1994-09-28 |
FR2703160A1 (fr) | 1994-09-30 |
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