CN100568774C - 波长分路滤波器以及光通信模块 - Google Patents
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Abstract
提供一种透射1310nm的波长频带的光,且反射1490nm与1650nm的波长频带的光的低成本的波长分路滤波器。该波长分路滤波器,在玻璃基板(10)上形成有位于入射光侧的第一多层膜(11)、和位于出射光侧的第二多层膜(12),第一多层膜(11)具有反射1490nm的波长频带的光,且透射1310nm的波长频带的光的特性,第二多层膜(12)具有反射1650nm的波长频带的光,且透射1310nm的波长频带的光的特性。
Description
技术领域
本发明涉及对必要的波长的光进行分路的波长分路滤波器以及使用该波长分路滤波器的光通信模块,特别是,涉及对在光通信模块中使用的特定的波长的光进行分路的波长分路滤波器以及使用该波长分路滤波器的光通信模块。
背景技术
在进行双向通信的光通信模块中,公知的有使2方向的信号光为相互不同的波长的光的2波长方式。作为信号光,通常所使用的是1310nm的波长频带的光与1490nm的波长频带的光。又,在线路工程之际作为必要的监控光,使用1650nm的波长频带的光。在光通信模块中,对于这些光而言,需要能够分别对这些光进行分离的结构。在进行双向通信的光通信模块中,作为具有能够对多种波长的光进行分离的结构的光通信模块,有例如专利文献1列举的光通信模块。
【专利文献1】特开平10-10354号公报
在与光纤的端面同轴以及与其呈直角的方向上分别配置有受光部与发光部的情况下,在受光部与发光部的光轴所交叉的位置设置波长分路滤波器,对光进行分路。该波长分路滤波器需要是如下的波长分路滤波器:配置为对于光轴呈45°的角度,透射1310nm的波长频带的光,反射1490nm与1650nm的波长频带的光。
但是,在作为通常的多层膜滤波器的材料而使用的SiO2与Ta2O5的组合中,不能够一次包括从1490nm至1650nm的范围。因此,可以考虑在波长分路滤波器的透射光侧设置只反射1650nm的波长频带的光的滤波器,使得1650nm的波长频带的光不进入到接受1310nm的波长频带的光的受光部中。但是,该情况下,因为部件数目增加所以需要进行对位,从而成本增大。
又,可以考虑通过变更膜材料来拓宽反射的光的波长范围。即,可以考虑使用折射率比Ta2O5高的Nb2O5或者TiO2。但是,波长分路滤波器通过在光通信模块内由UV粘接剂固定,可以低成本地制造光通信模块,但是,这些材料不能够使用UV粘接剂,所以需要其它的固定方法,从而这也增大成本。
发明内容
本发明正是鉴于上述问题而作出的,目的在于提供一种透射1310nm的波长频带的光,且反射1490nm与1650nm的波长频带的光的低成本的波长分路滤波器以及使用该波长分路滤波器的光通信模块。
为了解决上述问题,本发明提供一种光通信用波长分路滤波器,在玻璃基板上形成位于入射光侧的第一多层膜与位于出射光侧的第二多层膜而成,该波长分路滤波器的特征在于,
在上述玻璃基板的一面上形成上述第二多层膜,在上述第二多层膜之上层叠形成上述第一多层膜,上述第一多层膜具有反射1490nm的波长频带的光,且透射1310nm的波长频带的光的特性,上述第二多层膜具有反射1650nm的波长频带的光,且透射1310nm的波长频带的光的特性。
又,本发明的光通信模块,其特征在于,包括:受光部,其在光纤的光轴方向上配置且接受1310nm的波长频带的光;发光部,其在与上述光纤的光轴方向正交的方向上配置,且发出1490nm的波长频带的光;以及波长分路滤波器,其配置于上述受光部与发光部的光轴所交叉的位置,
上述波长分路滤波器在玻璃基板上形成有位于入射光侧的第一多层膜和位于出射光侧的第二多层膜,在上述玻璃基板的一面上形成上述第二多层膜,在上述第二多层膜之上层叠形成上述第一多层膜,上述第一多层膜具有反射1490nm的波长频带的光,且透射1310nm的波长频带的光的特性,上述第二多层膜具有反射1650nm的波长频带的光,且透射1310nm的波长频带的光的特性,将上述发光部出射的光沿上述光纤的端面方向反射,并且透射从上述光纤的端面出射的光。
(发明效果)
根据本发明的波长分路滤波器,因为通过配置于入射光侧的第一多层膜具有反射1490nm的波长频带的光,且透射1310nm的波长频带的光的特性,配置于出射光侧的第二多层膜具有反射1650nm的波长频带的光,且透射1310nm的波长频带的光的特性,就可以在入射侧反射1490nm的波长频带的光,所以可以防止该光的二重焦点化,并且因为可以降低第二多层膜相对于1490nm的波长频带的光的矩形性,所以可以减小膜厚,从而可以实现成本降低。
又,根据本发明的光通信模块,因为构成为将上述波长分路滤波器配置于受光部与发光部的光轴所交叉的位置,所以可以低成本地构成模块。
附图说明
图1是本实施方式的波长分路滤波器的剖面图;
图2是表示构成波长分路滤波器的第一多层膜滤波器的透射特性的图;
图3是表示构成波长分路滤波器的第二多层膜滤波器的透射特性的图;
图4是表示以反射长波长侧的光的方式构成第一多层膜滤波器这一情况的透射特性的图;
图5是使用了本实施方式的波长分路滤波器的光通信模块的结构图。
图中,1-波长分路滤波器;2-受光部;3-发光部;4-透镜;5-光纤;5a-箍;10-玻璃基板;11-第一多层膜滤波器;12-第二多层膜滤波器。
具体实施方式
参照附图详细地说明本发明的实施方式。图1是本实施方式的波长分路滤波器的剖面图。如该图所示,本实施方式的波长分路滤波器1在玻璃基板10上形成有第一多层膜11与第二多层膜12而成。这些第一多层膜11与第二多层膜12,任意之一都由SiO2与Ta2O5构成,并根据将由下述式得到的厚度的膜交替地形成为多层膜这一结构、和将为了抑制旁瓣(sidelobe)而调整的厚度的膜形成为多层膜的结构而得到。
【公式1】
其中,d是膜厚(nm),λ是反射中心波长(nm),n是膜的折射率,n0是光的入射介质的折射率,θ是光相对于多层膜的入射角度(弧度(radian))。又,波长分路滤波器1相对于光的光轴呈45°的角度,并且第一多层膜滤波器11配置于光的入射侧,第二多层膜滤波器12配置于光的出射侧。
第一多层膜滤波器11具有反射1490nm的波长频带的光、透射1310nm的波长频带的光的特性。又,第二多层膜滤波器12具有反射1650nm的波长频带的光、透射1310nm的波长频带的光的特性。因此,入射到波长分路滤波器1上的1310nm的波长频带的光直接透射而出,入射到波长分路滤波器1上的1490nm的波长频带的光被第一多层膜1向90°方向反射。1650nm的波长频带的光,被第一多层膜11以及第二多层膜12这两方向90°方向反射,1310nm波长频带的光不在透射的方向上透射。
图2表示第一多层膜滤波器11对于波长的透射特性,图3表示第二多层膜滤波器12对于波长的透射特性。如图2所示,第一多层膜滤波器11,对1310nm上透射比高,在1310nm与1490nm之间透射比急剧降低,对1490nm透射比低,即反射率高,从1490nm开始,伴随着波长变大,透射比平缓地变大。因而,对1650nm具有中间透射比。
又,如图3所示,第二多层膜滤波器12,对1310nm透射比高,从1310nm开始,伴随着波长变大,透射比平缓地变低。而且,对1650nm透射比低。因为1490nm的波长频带的光被配置于入射侧的第一多层膜滤波器11反射,几乎不入射到第二多层膜滤波器12中,所以第二多层膜滤波器12不需要具有反射1490nm的波长频带的光的特性。也就是说,即使透射特性的矩形性低,也可以良好地减小薄滤波器的膜厚。
另一方面,在重叠具有分别不同的反射中心波长的滤波器的情况下,通常将反射长波长侧的滤波器配置于光的入射侧。即,构成为,第一多层膜滤波器11具有反射1650nm的波长频带的光的特性,第二多层膜滤波器12具有反射1490nm的波长频带的光的特性。该情况下,用于得到良好的分离特性的第一多层膜滤波器11的透射特性如图4所示。
对于第一多层膜滤波器11而言,在构成为反射作为长波长侧的1650nm的波长频带的光的情况下,若被第二多层膜滤波器12反射的1490nm的波长频带的光的一部分被第一多层膜滤波器11反射,则1490nm的波长频带的光在第一多层膜滤波器11与第二多层膜滤波器12这2个部位反射,从而二重分离。若1490nm的波长频带的光二重分离,则因为在受光部中成为二重焦点,所以较大地损失光。
为了防止二重焦点化,在第一多层膜滤波器11上,需要尽可能增大1490nm的波长频带的光的透射比。因而,需要构成第一多层膜滤波器11使得其如图4所示具有矩形性在1490nm与1650nm之间高的特性。又,因为需要透射1310nm的波长频带的光,所以必须作成为对于从1310nm至1490nm的较宽频带而言透射比高的滤波器。因此,需要增厚第一多层膜滤波器11的厚度,从而成本增大。
因为本实施方式的波长分路滤波器1以作为光的入射侧的第一多层膜滤波器11来反射1490nm的波长频带的光,所以反射1650nm的波长频带的光的第二多层膜滤波器12不需要提高对1490nm的波长频带的透射比,只要是如图3所示的矩形性低的特性即可。因而,对于反射1650nm的波长频带的光的滤波器而言,可以减薄膜厚,从而可以实现成本降低。
接着,说明使用了该波长分路滤波器1的光通信模块。图5表示使用了本实施方式的波长分路滤波器1的光通信模块的结构图。如该图所示,光通信模块包括接受光的受光部2、发射光的发光部3、传播光的光纤5、以及上述的波长分路滤波器1。
受光部2接受1310nm的波长频带的光,由光敏二极管构成。发光部3发射1490nm的波长频带的光,由激光器二极管(laser diode)构成。光纤5在前端部设置有箍5a,其被固定于光通信模块内。又,波长分路滤波器1由UV粘接剂固定于光通信模块内。
受光部2在光纤5的光轴方向上设置,发光部3在与光纤5的光轴方向正交的方向上设置。又,在受光部2与发光部3以及光纤5的前面分别设置有透镜4,使发散光成为平行光,或者使平行光成为会聚光。
波长分路滤波器1对于各光轴呈45°的角度地配置于受光部2与发光部3的光轴所交叉的位置。1310nm的波长频带的光20从光纤5入射到波长分路滤波器1上,1490nm的波长频带的光21从发光部3入射到波长分路滤波器1上。又,1650nm的波长频带的光22,与1310nm的波长频带的光20一起从光纤5出射,入射到波长分路滤波器1上。
来自于光纤5的1310nm的波长频带的光20透射波长分路滤波器1的第一多层膜滤波器11以及第二多层膜滤波器12而出,并通过透镜4而被受光部接受。又,来自于发光部3的1490nm的波长频带的光21被波长分路滤波器1的第一多层膜滤波器11反射90°的角度,并通过透镜4而入射到光纤5中。
1650nm的波长频带的光22在波长分路滤波器1的第一多层膜11与第二多层膜12这两方上被分别反射90°的角度。因为在被波长分路滤波器1反射的方向上,有发光部3,没有受光部2,所以光22不被受光部2作为错误信号检测。如以上所述,可以通过波长分路滤波器1来分别对1310nm与1490nm的波长频带的光进行分路,并且可以使1650nm的波长频带的光不入射到受光部2上,从而可以进行双向通信。
以上,说明了本发明的实施方式,不过本发明的应用并不限定于这些实施方式,能够在其技术思想的范围内进行各种各样的应用。
Claims (2)
1.一种光通信用波长分路滤波器,在玻璃基板上形成位于入射光侧的第一多层膜和位于出射光侧的第二多层膜而成,该波长分路滤波器的特征在于,
在上述玻璃基板的一面上形成上述第二多层膜,在上述第二多层膜之上层叠形成上述第一多层膜,上述第一多层膜具有反射1490nm的波长频带的光,且透射1310nm的波长频带的光的特性,上述第二多层膜具有反射1650nm的波长频带的光,且透射1310nm的波长频带的光的特性。
2.一种光通信模块,其特征在于,
包括:受光部,其在光纤的光轴方向上配置且接受1310nm的波长频带的光;发光部,其在与上述光纤的光轴方向正交的方向上配置,且发出1490nm的波长频带的光;以及波长分路滤波器,其配置于上述受光部与发光部的光轴交叉的位置,
上述波长分路滤波器在玻璃基板上形成有位于入射光侧的第一多层膜和位于出射光侧的第二多层膜,在上述玻璃基板的一面上形成上述第二多层膜,在上述第二多层膜之上层叠形成上述第一多层膜,上述第一多层膜具有反射1490nm的波长频带的光,且透射1310nm的波长频带的光的特性,上述第二多层膜具有反射1650nm的波长频带的光,且透射1310nm的波长频带的光的特性,将上述发光部出射的光向上述光纤的端面方向反射,并且透射从上述光纤的端面出射的光。
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JP4015091B2 (ja) * | 2003-09-17 | 2007-11-28 | 古河電気工業株式会社 | 光線路監視用デバイス |
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