WO2012014286A1 - Light module - Google Patents

Light module Download PDF

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Publication number
WO2012014286A1
WO2012014286A1 PCT/JP2010/062628 JP2010062628W WO2012014286A1 WO 2012014286 A1 WO2012014286 A1 WO 2012014286A1 JP 2010062628 W JP2010062628 W JP 2010062628W WO 2012014286 A1 WO2012014286 A1 WO 2012014286A1
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Prior art keywords
light
signal
wavelength
signal light
optical module
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PCT/JP2010/062628
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French (fr)
Japanese (ja)
Inventor
白井　聡
伸夫 大畠
有賀　博
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三菱電機株式会社
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Priority to PCT/JP2010/062628 priority Critical patent/WO2012014286A1/en
Publication of WO2012014286A1 publication Critical patent/WO2012014286A1/en

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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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/0225—Out-coupling of light
    • H01S5/02251—Out-coupling of light using optical fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/0225—Out-coupling of light
    • H01S5/02255—Out-coupling of light using beam deflecting elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • H01S5/4087—Array arrangements, e.g. constituted by discrete laser diodes or laser bar emitting more than one wavelength

Definitions

  • the present invention relates to an optical module used for optical communication.
  • the bidirectional optical module described in Patent Document 1 includes two optical transmission subassemblies and one optical reception subassembly, and realizes a small and low-cost optical module.
  • an optical filter disposed on a surface where signal lights of different wavelengths cross each other transmits a signal light of one wavelength and a signal of the other wavelength. Multiplexing / demultiplexing is performed by reflecting light.
  • the optical filter used in this configuration a multilayer filter is used, and the transmittance of a specific wavelength is high, and the material of each layer is set so that the transmittance is low (high reflectance) at a specific wavelength different from this.
  • the thickness and number of layers are designed.
  • Multilayer filters have transmittance and reflectance independent of polarization when the incident direction of light is vertical. However, when the incident angle changes (when the incident direction is not vertical), the polarization depends on the polarization. It has a feature of showing different transmittance and reflectance.
  • a multilayer filter is used in an optical module that multiplexes and demultiplexes a plurality of signal lights, since the incident angle of light is usually set to about 45 °, the characteristics of the multilayer filter are polarization-dependent. have.
  • the polarization dependency is particularly large, and the wavelength exhibiting the same transmittance is different by about 50 nm between p-polarized light and s-polarized light. For this reason, when the polarization direction of the light incident on the filter is not controlled, this polarization dependence increases the wavelength between the completely transmitted wavelength and the completely reflected wavelength, and the wavelength interval that can be multiplexed / demultiplexed by the optical module. There is a problem that cannot be narrowed. In order to narrow the wavelength interval, it is necessary to have a complicated design and increase the number of layers, which not only leads to an increase in the cost of the multilayer filter, but also makes it difficult to achieve the required performance.
  • the present invention has been made in view of the above, and an object of the present invention is to obtain a low-cost optical module that can narrow the wavelength interval of signal light to be combined.
  • the present invention provides two light emitting elements that emit signal lights of different wavelengths and one signal light at a point where the signal lights from the respective light emitting elements intersect.
  • An optical filter that reflects the other signal light and multiplexes the two signal lights, and of the two signal lights, at least the signal light that is reflected by the optical filter It is characterized by being incident on the filter with s polarization.
  • the optical module according to the present invention produces an effect that an optical module capable of multiplexing two signal lights having a narrower wavelength interval than the conventional one can be realized at low cost.
  • FIG. 1 is a diagram illustrating a configuration example of an optical module.
  • FIG. 2 is a diagram showing the transmission characteristics of the multilayer filter constituting the optical module of the first embodiment.
  • FIG. 3 is a diagram showing the transmission characteristics of the multilayer filter constituting the optical module of the third embodiment.
  • FIG. 1 is a diagram illustrating a configuration example of the optical module according to the first embodiment.
  • the optical module of the present embodiment includes light emitting elements 1 and 2, lenses 3 and 4, and a multilayer filter 5.
  • An optical fiber 6 is connected to this optical module.
  • subjected is a housing
  • the light emitting element 1 emits signal light having a wavelength ⁇ 1 .
  • the emitted signal light is arranged so as to enter the multilayer filter 5 after passing through the lens 3.
  • the light emitting element 2 emits signal light having a wavelength ⁇ 2 .
  • the emitted signal light is arranged so as to enter the multilayer filter 5 after passing through the lens 4.
  • the wavelength of the signal light emitted from the light emitting element 1 is shorter, that is, the relationship of ⁇ 1 ⁇ 2 is established. Furthermore, it is assumed that the light-emitting element 1 is arranged so that signal light of wavelength ⁇ 1 is incident on the multilayer filter 5 with s-polarization.
  • the multilayer filter 5 which is an optical filter is installed at a point where the signal light from the light emitting elements 1 and 2 intersects.
  • the signal light from the light emitting element 1 is reflected on one incident surface and is reflected on the optical fiber 6. Make it incident.
  • the signal light from the light emitting element 2 is transmitted and incident on the optical fiber 6.
  • FIG. 2 is a diagram showing the transmission characteristics of the multilayer filter 5 constituting the optical module of the present embodiment.
  • “s” marked indicates s-polarized transmission characteristics
  • “p” marked p-polarized transmission characteristics Further, the broken line in the horizontal direction indicates 100% transmittance.
  • ⁇ 1 and ⁇ 2 indicate the wavelengths of signal light emitted from each light emitting element.
  • the transmission characteristic and the reflection characteristic are almost opposite to each other, and the reflectance is low at a wavelength with high transmittance, and the reflectance is high at a wavelength with low transmittance.
  • the signal light from the light emitting element 1 that emits light with a short wavelength ⁇ 1 is incident on the multilayer filter 5 with s-polarization. Further, the relationship between the wavelength ( ⁇ 1 , ⁇ 2 ) of each signal light and the transmission characteristics of the s-polarized light is shown in FIG. Therefore, the signal light from the light emitting element 1 having the wavelength ⁇ 1 is almost completely reflected.
  • the signal light of wavelength ⁇ 2 emitted from the light-emitting element 2 is incident on the multilayer filter 5 in the polarization direction. Even if it is not controlled, it is almost completely transmitted. Therefore, the multilayer filter 5 combines the signal light from each light emitting element with low loss and enters the optical fiber 6.
  • the optical module according to the present embodiment includes the two light emitting elements and the multilayer filter 5, and these components are arranged so that the signal light from each light emitting element intersects in the multilayer filter 5.
  • the signal light having a short wavelength out of the two signal lights is incident on the multilayer filter 5 with s polarization.
  • the signal light from two light emitting elements can be combined with low loss in the multilayer filter 5.
  • the p-polarization characteristic can be ignored for the wavelength ⁇ 1 (the signal light having the shorter wavelength)
  • the transmission characteristics of the s-polarization and the p-polarization depend on the wavelength (when the wavelength dependence is large).
  • FIG. 2 The configuration of the optical communication module of the present embodiment is the same as that of the first embodiment. Therefore, the description will be made with reference to FIG.
  • the optical module configured such that the signal light having a short wavelength out of the signal light incident on the multilayer filter 5 is incident on the s-polarized wave is shown.
  • the longer signal light may also be incident on the multilayer filter 5 with s polarization. That is, both the signal light emitted from each of the light emitting elements 1 and 2 may be incident on the multilayer filter 5 with s polarization.
  • the optical module since only the s-polarization characteristics need be considered in the transmission characteristics shown in FIG. 2, the optical module combines two signal lights with a narrow wavelength interval as in the first embodiment.
  • the multilayer filter 5 easily realizes transmission characteristics with higher s-polarization and transmission characteristics with sharp edges with a simple layer configuration, the polarization of each incident light to the multilayer filter 5 is changed to s-polarization. By limiting, it becomes possible to multiplex two signal lights having a further narrower wavelength interval, and an optical module having high-performance multiplex characteristics can be realized at low cost.
  • the polarization of each incident light to the multilayer filter 5 is limited to s polarization.
  • an optical module capable of combining two signal lights with a narrower wavelength interval than the optical module of the first embodiment is obtained.
  • Embodiment 3 The configuration of the optical communication module of the present embodiment is the same as that of the first and second embodiments. Therefore, the description will be made with reference to FIG. 1 as in the first and second embodiments.
  • the multilayer filter 5 having the transmission characteristics shown in FIG. 3 may be applied. Further, by limiting the polarization of each incident light to the multilayer filter 5 to s-polarization as in the second embodiment, even when the wavelength ⁇ 2 of the transmitted signal light is shorter, a narrower wavelength interval Thus, an optical module having high-performance multiplexing characteristics can be realized at low cost.
  • the optical module according to the present invention is useful for optical communication, and is particularly suitable for an optical module that combines two signal lights having different wavelengths.

Abstract

A light module is equipped with: two light-emitting elements (1, 2) that each emit a signal light of a different wavelength; and a multilayer filter (5) that combines the two signal lights by transmitting one signal light and reflecting the other signal light at the point where the signal lights from the light-emitting elements (1, 2) intersect. The light module is configured in such a manner that, of the two signal lights, at least the signal light that is reflected by the multilayer filter (5) is made to strike the multilayer filter (5) by s-polarization.

Description

光モジュールOptical module
　本発明は、光通信に用いる光モジュールに関する。 The present invention relates to an optical module used for optical communication.
　従来の通信用光モジュールとして特許文献１に記載の双方向光モジュールが存在する。この特許文献１に記載された双方向光モジュールは、２つの光送信サブアセンブリと１つの光受信サブアセンブリを含んだ構成となっており、小型且つ低コストな光モジュールを実現している。このような複数の信号光を合分波する光モジュールにおいては、異なる波長の信号光が交わる面に配置されている光学フィルタによって、一方の波長の信号光を透過し、もう一方の波長の信号光を反射することによって合分波を行っている。 There is a bidirectional optical module described in Patent Document 1 as a conventional communication optical module. The bidirectional optical module described in Patent Document 1 includes two optical transmission subassemblies and one optical reception subassembly, and realizes a small and low-cost optical module. In such an optical module that multiplexes and demultiplexes a plurality of signal lights, an optical filter disposed on a surface where signal lights of different wavelengths cross each other transmits a signal light of one wavelength and a signal of the other wavelength. Multiplexing / demultiplexing is performed by reflecting light.
　この構成に用いられる光学フィルタとしては多層膜フィルタが利用され、特定波長では透過率が高く、また、これとは異なる特定波長では透過率が低く（反射率が高く）なるように各層の材質、厚み及び層数が設計されている。 As the optical filter used in this configuration, a multilayer filter is used, and the transmittance of a specific wavelength is high, and the material of each layer is set so that the transmittance is low (high reflectance) at a specific wavelength different from this. The thickness and number of layers are designed.
特開２００６－２８５０８７号公報JP 2006-285087 A
　多層膜フィルタは、光の入射方向が垂直方向の場合、透過率及び反射率は偏波無依存であるが、入射角度が変わった場合（入射方向が垂直方向ではない場合）には偏波によって異なる透過率及び反射率を示すという特徴を有している。複数の信号光を合分波する光モジュールに多層膜フィルタが使用される場合、通常は光の入射角度が約４５°となるように設定されるため、多層膜フィルタの特性は偏波依存性を持つ。 Multilayer filters have transmittance and reflectance independent of polarization when the incident direction of light is vertical. However, when the incident angle changes (when the incident direction is not vertical), the polarization depends on the polarization. It has a feature of showing different transmittance and reflectance. When a multilayer filter is used in an optical module that multiplexes and demultiplexes a plurality of signal lights, since the incident angle of light is usually set to about 45 °, the characteristics of the multilayer filter are polarization-dependent. have.
　ほぼ完全透過する波長から、ほぼ完全反射する波長までの変化領域においては特に偏波依存性が大きくｐ偏波とｓ偏波とでは同じ透過率を示す波長が５０ｎｍ程度異なる。そのため、フィルタへの入射光の偏波方向を制御しない場合には、この偏波依存性により、完全透過する波長と完全反射する波長間隔が大きくなってしまい、光モジュールで合分波できる波長間隔を狭くすることが出来ないという問題がある。波長間隔を狭くするためには複雑な設計と、積層数を増やすことが必要で、多層膜フィルタの高コスト化につながるばかりでなく、要求性能の実現が困難となる場合も生じる。 In the change region from the wavelength that is almost completely transmitted to the wavelength that is almost completely reflected, the polarization dependency is particularly large, and the wavelength exhibiting the same transmittance is different by about 50 nm between p-polarized light and s-polarized light. For this reason, when the polarization direction of the light incident on the filter is not controlled, this polarization dependence increases the wavelength between the completely transmitted wavelength and the completely reflected wavelength, and the wavelength interval that can be multiplexed / demultiplexed by the optical module. There is a problem that cannot be narrowed. In order to narrow the wavelength interval, it is necessary to have a complicated design and increase the number of layers, which not only leads to an increase in the cost of the multilayer filter, but also makes it difficult to achieve the required performance.
　本発明は、上記に鑑みてなされたものであって、合波する信号光の波長間隔を狭くすることができ、かつ低コストな光モジュールを得ることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to obtain a low-cost optical module that can narrow the wavelength interval of signal light to be combined.
　上述した課題を解決し、目的を達成するために、本発明は、それぞれ異なる波長の信号光を発する２つの発光素子と、前記各発光素子からの信号光が交差する点において、一方の信号光を透過させ、かつ他方の信号光を反射させて２つの信号光を合波する光学フィルタと、を備え、前記２つの信号光のうち、少なくとも前記光学フィルタで反射させる信号光については、当該光学フィルタに対してｓ偏波で入射させることを特徴とする。 In order to solve the above-mentioned problems and achieve the object, the present invention provides two light emitting elements that emit signal lights of different wavelengths and one signal light at a point where the signal lights from the respective light emitting elements intersect. An optical filter that reflects the other signal light and multiplexes the two signal lights, and of the two signal lights, at least the signal light that is reflected by the optical filter It is characterized by being incident on the filter with s polarization.
　本発明にかかる光モジュールによれば、従来よりも狭い波長間隔の２つの信号光を合波可能な光モジュールを低コストで実現できる、という効果を奏する。 The optical module according to the present invention produces an effect that an optical module capable of multiplexing two signal lights having a narrower wavelength interval than the conventional one can be realized at low cost.
図１は、光モジュールの構成例を示す図である。FIG. 1 is a diagram illustrating a configuration example of an optical module. 図２は、実施の形態１の光モジュールを構成している多層膜フィルタの透過特性を示す図である。FIG. 2 is a diagram showing the transmission characteristics of the multilayer filter constituting the optical module of the first embodiment. 図３は、実施の形態３の光モジュールを構成している多層膜フィルタの透過特性を示す図である。FIG. 3 is a diagram showing the transmission characteristics of the multilayer filter constituting the optical module of the third embodiment.
　以下に、本発明にかかる光モジュールの実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, embodiments of an optical module according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
実施の形態１．
　図１は、実施の形態１の光モジュールの構成例を示す図である。本実施の形態の光モジュールは、発光素子１，２と、レンズ３，４と、多層膜フィルタ５とを備えている。また、この光モジュールには光ファイバ６が接続されている。なお、７が付された部分は光モジュールの筐体である。 Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration example of the optical module according to the first embodiment. The optical module of the present embodiment includes light emitting elements 1 and 2, lenses 3 and 4, and a multilayer filter 5. An optical fiber 6 is connected to this optical module. In addition, the part to which 7 is attached | subjected is a housing | casing of an optical module.
　発光素子１は、波長λ1の信号光を発光する。また、発光した信号光がレンズ３を通過した後に多層膜フィルタ５に入射するように配置されている。 The light emitting element 1 emits signal light having a wavelength λ 1 . The emitted signal light is arranged so as to enter the multilayer filter 5 after passing through the lens 3.
　発光素子２は、波長λ2の信号光を発光する。また、発光した信号光がレンズ４を通過した後に多層膜フィルタ５に入射するように配置されている。 The light emitting element 2 emits signal light having a wavelength λ 2 . The emitted signal light is arranged so as to enter the multilayer filter 5 after passing through the lens 4.
　ここで、本実施の形態の光モジュールでは、発光素子１から発光された信号光の波長の方が短い、すなわち、λ1＜λ2の関係が成り立っているものとする。さらに、波長λ1の信号光が多層膜フィルタ５にｓ偏波で入射されるように発光素子１が配置されているものとする。 Here, in the optical module of the present embodiment, it is assumed that the wavelength of the signal light emitted from the light emitting element 1 is shorter, that is, the relationship of λ 1 <λ 2 is established. Furthermore, it is assumed that the light-emitting element 1 is arranged so that signal light of wavelength λ 1 is incident on the multilayer filter 5 with s-polarization.
　光学フィルタである多層膜フィルタ５は、発光素子１，２からの信号光が交差する点に設置されており、発光素子１からの信号光は、一方の入射面に反射して光ファイバ６に入射させる。一方、発光素子２からの信号光は透過して光ファイバ６に入射させる。 The multilayer filter 5 which is an optical filter is installed at a point where the signal light from the light emitting elements 1 and 2 intersects. The signal light from the light emitting element 1 is reflected on one incident surface and is reflected on the optical fiber 6. Make it incident. On the other hand, the signal light from the light emitting element 2 is transmitted and incident on the optical fiber 6.
　次に、多層膜フィルタ５の詳細について、図２を用いて説明する。図２は、本実施の形態の光モジュールを構成している多層膜フィルタ５の透過特性を示す図である。図２において、「ｓ」が記されたものはｓ偏波の透過特性を示し、「ｐ」が記されたものはｐ偏波の透過特性を示している。また、水平方向の破線は透過率１００％を示している。なお、λ1，λ2は各発光素子から発光される信号光の波長を示している。 Next, details of the multilayer filter 5 will be described with reference to FIG. FIG. 2 is a diagram showing the transmission characteristics of the multilayer filter 5 constituting the optical module of the present embodiment. In FIG. 2, “s” marked indicates s-polarized transmission characteristics, and “p” marked p-polarized transmission characteristics. Further, the broken line in the horizontal direction indicates 100% transmittance. Note that λ 1 and λ 2 indicate the wavelengths of signal light emitted from each light emitting element.
　透過特性と反射特性はほぼ逆の関係にあり、透過率の高い波長では反射率は低く、透過率の低い波長では反射率は高い。上述したように、本実施の形態では、波長の短いλ1で発光する発光素子１からの信号光が多層膜フィルタ５にｓ偏波で入射されるようにしている。さらに、各信号光の波長（λ1，λ2）とｓ偏波の透過特性の関係が図２に示したものとしている。そのため、波長がλ1である発光素子１からの信号光は、ほぼ完全反射となる。波長の長いλ2においてはｓ偏波もｐ偏波もほぼ完全透過の特性を示すため、発光素子２が発光する波長λ2の信号光は、多層膜フィルタ５に対して入射する偏波方向を制御しなくともほぼ完全透過する。従って、多層膜フィルタ５は、各発光素子からの信号光を低損失で合波して光ファイバ６に入射させる。 The transmission characteristic and the reflection characteristic are almost opposite to each other, and the reflectance is low at a wavelength with high transmittance, and the reflectance is high at a wavelength with low transmittance. As described above, in the present embodiment, the signal light from the light emitting element 1 that emits light with a short wavelength λ 1 is incident on the multilayer filter 5 with s-polarization. Further, the relationship between the wavelength (λ 1 , λ 2 ) of each signal light and the transmission characteristics of the s-polarized light is shown in FIG. Therefore, the signal light from the light emitting element 1 having the wavelength λ 1 is almost completely reflected. Since s-polarized light and p-polarized light are almost completely transmitted at λ 2 having a long wavelength, the signal light of wavelength λ 2 emitted from the light-emitting element 2 is incident on the multilayer filter 5 in the polarization direction. Even if it is not controlled, it is almost completely transmitted. Therefore, the multilayer filter 5 combines the signal light from each light emitting element with low loss and enters the optical fiber 6.
　このように、本実施の形態の光モジュールは、２つの発光素子と、多層膜フィルタ５とを備え、これらの構成要素は、各発光素子からの信号光が多層膜フィルタ５において交差するように配置され、かつ２つの信号光のうち短い波長の信号光はｓ偏波で多層膜フィルタ５に入射するようにした。これにより、２つの発光素子からの信号光を多層膜フィルタ５において低損失で合波できる。また、波長λ1（波長が短いほうの信号光）についてはｐ偏波特性を無視できるため、ｓ偏波とｐ偏波の透過特性が波長に依存する場合（波長依存性が大きい場合）でも、各信号光の波長間隔（λ1とλ2の間隔）を狭くするために多層膜フィルタ５の層構造を複雑にする必要がなくなる。すなわち、従来よりも狭い波長間隔の２つの信号光を合波可能な光モジュールを低コストで実現できる。 As described above, the optical module according to the present embodiment includes the two light emitting elements and the multilayer filter 5, and these components are arranged so that the signal light from each light emitting element intersects in the multilayer filter 5. The signal light having a short wavelength out of the two signal lights is incident on the multilayer filter 5 with s polarization. Thereby, the signal light from two light emitting elements can be combined with low loss in the multilayer filter 5. In addition, since the p-polarization characteristic can be ignored for the wavelength λ 1 (the signal light having the shorter wavelength), the transmission characteristics of the s-polarization and the p-polarization depend on the wavelength (when the wavelength dependence is large). However, it is not necessary to complicate the layer structure of the multilayer filter 5 in order to reduce the wavelength interval (interval between λ 1 and λ 2 ) of each signal light. That is, an optical module that can multiplex two signal lights with a wavelength interval narrower than the conventional one can be realized at low cost.
実施の形態２．
　本実施の形態の光通信モジュールの構成は、実施の形態１と同様である。そのため、実施の形態１と同様に、図１を用いて説明を行う。実施の形態１では、多層膜フィルタ５に入射される信号光のうち、波長の短い信号光をｓ偏波で入射するように構成した光モジュールを示したが、もう一方の信号光（波長が長い方の信号光）もｓ偏波で多層膜フィルタ５に入射するように構成してもよい。すなわち、発光素子１と２のそれぞれから発光された信号光の双方が多層膜フィルタ５にｓ偏波で入射されるようにしてもよい。このように構成した場合、図２に示した透過特性においてｓ偏波の特性のみを考慮すればよいので、光モジュールは、実施の形態１と同様に波長間隔の狭い２つの信号光を合波することができる。多層膜フィルタ５はｓ偏波の方が高い透過特性と急峻なエッジをもつ透過特性を簡単な層構成で実現しやすいため、多層膜フィルタ５への各入射光の偏波をｓ偏波に限定することで、さらに狭い波長間隔の２つの信号光を合波できるようになり、高性能な合波特性を有する光モジュールを低コストで実現できる。 Embodiment 2. FIG.
The configuration of the optical communication module of the present embodiment is the same as that of the first embodiment. Therefore, the description will be made with reference to FIG. In the first embodiment, the optical module configured such that the signal light having a short wavelength out of the signal light incident on the multilayer filter 5 is incident on the s-polarized wave is shown. The longer signal light) may also be incident on the multilayer filter 5 with s polarization. That is, both the signal light emitted from each of the light emitting elements 1 and 2 may be incident on the multilayer filter 5 with s polarization. In such a configuration, since only the s-polarization characteristics need be considered in the transmission characteristics shown in FIG. 2, the optical module combines two signal lights with a narrow wavelength interval as in the first embodiment. can do. Since the multilayer filter 5 easily realizes transmission characteristics with higher s-polarization and transmission characteristics with sharp edges with a simple layer configuration, the polarization of each incident light to the multilayer filter 5 is changed to s-polarization. By limiting, it becomes possible to multiplex two signal lights having a further narrower wavelength interval, and an optical module having high-performance multiplex characteristics can be realized at low cost.
　このように、本実施の形態の光モジュールでは、多層膜フィルタ５への各入射光の偏波をｓ偏波に限定することとした。これにより、実施の形態１の光モジュールと比較して、さらに狭い波長間隔の２つの信号光を合波可能な光モジュールが得られる。 As described above, in the optical module of the present embodiment, the polarization of each incident light to the multilayer filter 5 is limited to s polarization. As a result, an optical module capable of combining two signal lights with a narrower wavelength interval than the optical module of the first embodiment is obtained.
実施の形態３．
　本実施の形態の光通信モジュールの構成は、実施の形態１，２と同様である。そのため、実施の形態１，２と同様に、図１を用いて説明を行う。実施の形態１，２では、多層膜フィルタ５で反射させる信号光の波長λ1の方が短い場合（λ1＜λ2となっている場合）について説明を行ったが、図１の発光素子２が発光する信号光の波長（λ2）の方が短波長の場合においても、同様な性能の光モジュール（狭い波長間隔の２つの信号光を合波可能な光モジュール）を実現できる。すなわち、多層膜フィルタ５で反射させる信号光の波長λ1の方が長い場合（λ2＜λ1の場合）には、図３に示した透過特性の多層膜フィルタ５を適用すればよい。また、実施の形態２と同様に多層膜フィルタ５への各入射光の偏波をｓ偏波に限定することで、透過させる信号光の波長λ2の方が短い場合でも、さらに狭い波長間隔の２つの信号光を合波できるようになり、高性能な合波特性を有する光モジュールを低コストで実現できる。 Embodiment 3 FIG.
The configuration of the optical communication module of the present embodiment is the same as that of the first and second embodiments. Therefore, the description will be made with reference to FIG. 1 as in the first and second embodiments. In the first and second embodiments, the case where the wavelength λ 1 of the signal light reflected by the multilayer filter 5 is shorter (when λ 1 <λ 2 ) has been described. Even when the wavelength (λ 2 ) of the signal light emitted by 2 is shorter, an optical module having the same performance (an optical module capable of combining two signal lights having a narrow wavelength interval) can be realized. That is, when the wavelength λ 1 of the signal light reflected by the multilayer filter 5 is longer (in the case of λ 2 <λ 1 ), the multilayer filter 5 having the transmission characteristics shown in FIG. 3 may be applied. Further, by limiting the polarization of each incident light to the multilayer filter 5 to s-polarization as in the second embodiment, even when the wavelength λ 2 of the transmitted signal light is shorter, a narrower wavelength interval Thus, an optical module having high-performance multiplexing characteristics can be realized at low cost.
　このように、多層膜フィルタ５で反射させる信号光の波長と透過させる信号光の波長の関係が実施の形態１，２と逆の場合であっても、同様の合波特性を実現可能である。 Thus, even if the relationship between the wavelength of the signal light reflected by the multilayer filter 5 and the wavelength of the signal light to be transmitted is opposite to that in the first and second embodiments, the same multiplexing characteristics can be realized. is there.
　以上のように、本発明にかかる光モジュールは、光通信に有用であり、特に、波長の異なる２つの信号光を合波する光モジュールに適している。 As described above, the optical module according to the present invention is useful for optical communication, and is particularly suitable for an optical module that combines two signal lights having different wavelengths.
　１，２　発光素子
　３，４　レンズ
　５　多層膜フィルタ
　６　光ファイバ
　７　光モジュールの筐体  DESCRIPTION OF SYMBOLS 1, 2 Light emitting element 3, 4 Lens 5 Multilayer filter 6 Optical fiber 7 Optical module housing

Claims (3)

  1. 　それぞれ異なる波長の信号光を発する２つの発光素子と、
    　前記各発光素子からの信号光が交差する点において、一方の信号光を透過させ、かつ他方の信号光を反射させて２つの信号光を合波する光学フィルタと、
    　を備え、
    　前記２つの信号光のうち、少なくとも前記光学フィルタで反射させる信号光については、当該光学フィルタに対してｓ偏波で入射させる
    　ことを特徴とする光モジュール。     Two light emitting elements that emit signal light of different wavelengths,
    An optical filter that transmits one signal light and reflects the other signal light to multiplex two signal lights at a point where the signal light from each light emitting element intersects;
    With
    Of the two signal lights, at least the signal light reflected by the optical filter is incident on the optical filter with s-polarized light.
  2. 　前記光学フィルタは、前記２つの信号光のうち、波長の短い方の信号光を反射する特性を有する
    　ことを特徴とする請求項１に記載の光モジュール。     The optical module according to claim 1, wherein the optical filter has a characteristic of reflecting signal light having a shorter wavelength of the two signal lights.
  3. 　前記光学フィルタは、前記２つの信号光のうち、波長の長い方の信号光を反射する特性を有する
    　ことを特徴とする請求項１に記載の光モジュール。
          The optical module according to claim 1, wherein the optical filter has a characteristic of reflecting a signal light having a longer wavelength of the two signal lights.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5455184A (en) * 1977-10-11 1979-05-02 Canon Inc Semiconductor laser light source unit
JPS61207088A (en) * 1985-03-12 1986-09-13 Nippon Hoso Kyokai <Nhk> Laser output synthesizer
JPS61214146A (en) * 1985-03-19 1986-09-24 Matsushita Electric Ind Co Ltd Optical head
JP2006285087A (en) * 2005-04-04 2006-10-19 Sumitomo Electric Ind Ltd Bidirectional optical module

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5455184A (en) * 1977-10-11 1979-05-02 Canon Inc Semiconductor laser light source unit
JPS61207088A (en) * 1985-03-12 1986-09-13 Nippon Hoso Kyokai <Nhk> Laser output synthesizer
JPS61214146A (en) * 1985-03-19 1986-09-24 Matsushita Electric Ind Co Ltd Optical head
JP2006285087A (en) * 2005-04-04 2006-10-19 Sumitomo Electric Ind Ltd Bidirectional optical module

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