WO2014112281A1 - Optical module and optical transmission system - Google Patents

Optical module and optical transmission system Download PDF

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Publication number
WO2014112281A1
WO2014112281A1 PCT/JP2013/084078 JP2013084078W WO2014112281A1 WO 2014112281 A1 WO2014112281 A1 WO 2014112281A1 JP 2013084078 W JP2013084078 W JP 2013084078W WO 2014112281 A1 WO2014112281 A1 WO 2014112281A1
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Prior art keywords
light
optical
optical module
incident
emission
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PCT/JP2013/084078
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French (fr)
Japanese (ja)
Inventor
博志 立石
那倉　裕二
加藤　清
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株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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Publication of WO2014112281A1 publication Critical patent/WO2014112281A1/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
    • 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
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
    • G02B6/322—Optical coupling means having lens focusing means positioned between opposed fibre ends and having centering means being part of the lens for the self-positioning of the lightguide at the focal point, e.g. holes, wells, indents, nibs

Definitions

  • the present invention relates to an optical module used for transmitting an optical signal, and an optical transmission system using the optical module.
  • laser light with high directivity and focusing is used as a light source in optical transmission systems and optical connectors.
  • laser light is collected by an optical lens and introduced into an optical fiber. Are connected directly to perform optical transmission. For this reason, the outgoing light from the optical fiber becomes divergent light.
  • Patent Document 1 there is a method of performing optical transmission using a relay connection of an optical fiber by using a collimating lens as light emitted from a diffusing optical fiber as expanded parallel light.
  • the light emitted from the exit surface of the optical connector becomes parallel light regardless of whether transmission, reception, or relay is performed, and the optical power ( The density is also high. This is not a problem at the steady state when optical connectors are fitted and information is transmitted. However, when the optical connector is not fitted, such as checking whether light has arrived, there is much work by humans. May damage your eyes. In order to prevent injury to the eyes (hereinafter, this concept is referred to as “eye safety”), for example, the IEC standard and EN standard also include standards (IEC 60825) defined from the viewpoint of eye safety. 1, EN60825-1, etc.).
  • Optical transmission requires relatively high optical power, and according to the above eye safety standards, it is obliged to wear protective glasses depending on the optical power (density), and to measure and evaluate with sensors in a closed space where human eyes do not touch.
  • the workability was extremely poor and difficult.
  • the problem to be solved by the present invention is that eye safety that does not obligate measurement / evaluation by a sensor in a closed space that is not in contact with human eyes without wearing protective glasses without reducing the transmitted optical power.
  • An object of the present invention is to provide an optical module and an optical transmission system that can satisfy the standards.
  • an optical module is a member made of a light emitting member that emits light and a material that transmits light emitted from the light emitting member, and the light that has passed through is emitted.
  • An emission-side light transmission member that has an emission surface and is connectable to an incident-side light transmission member to which a light incident member on which light emitted from the emission surface is incident is attached. The light emitted from the emission surface is divergent light.
  • the exit side light transmitting member is provided with an adjustment lens portion through which the light emitted from the light emitting member passes so that the divergence angle of the diverging light emitted from the emission surface becomes a predetermined angle. It is good to have.
  • an optical transmission system is provided on at least a part of a path from a light emitting unit that emits an optical signal to a light receiving unit that receives the optical signal.
  • An optical transmission system including an output-side optical module that is an optical module and an incident-side optical module connected to the output-side optical module, wherein the incident-side optical module serves as an output-side light transmitting member of the output-side optical module
  • An incident-side light transmitting member made of a material that can be connected and transmits light, and a light incident member on which light that has passed through the incident-side light transmitting member is incident.
  • a converging lens unit is provided for converging the diverging light emitted from the exit surface of the exit side light transmitting member of the side light module so as to enter the light incident member. .
  • light emitted from the emission surface of the emission side light transmitting member is divergent light. Therefore, the light emitted from the emission surface spreads in the plane direction orthogonal to the optical axis as it leaves the emission surface. That is, the optical power within a predetermined range (amount of light within the predetermined range) at a location that is a predetermined distance away from the exit surface is smaller than the optical power within the same range at the exit surface (amount of light within the same range). Therefore, the required eye safety standard can be satisfied without reducing the transmitted optical power.
  • emitted from the output surface of an output side light transmissive member is connected to an output side light transmissive member (it may be directly connected or a relay member)
  • the light emitted from the exit surface may be diverged if the light is converged on the light incident member by the converging lens portion provided on the incident side light transmitting member. Almost no transmission loss occurs.
  • the optical power within a predetermined range at a location separated by the predetermined length is increased or decreased by a change in the divergence angle of the divergent light emitted from the emission surface. Therefore, if the adjustment lens part that allows light to pass through is provided on the exit side light transmitting member, the divergence angle is set so as to satisfy the required eye safety standard by designing the adjustment lens part (adjusting the refractive index). it can.
  • FIG. 1 schematically shows a cross-section (hatching is omitted) of an optical module according to an embodiment of the present invention (the optical module is used at an intermediate position of an optical transmission system (where optical fibers are optically connected)).
  • FIG. It is a schematic diagram when the light emitted from the emission surface is divergent light so that there is a component (light ray) deviating from the virtual circle with the diameter d at a point away from the emission surface by a predetermined distance D.
  • FIG. 1 is a schematic diagram of an optical transmission system according to an embodiment of the present invention.
  • FIG. 6 is a schematic view of an optical transmission system different from that of FIG. 5 (a holder having the same shape on the light emitting element side and the light receiving element side). It is a schematic diagram of the structure using the relay connector which connects an output side light transmissive member and an incident side light transmissive member.
  • An optical module 10 includes a light emitting member 11 and an emitting side light transmitting member 12.
  • the light emitting member 11 is a member that emits light constituting a signal to be transmitted.
  • the optical module 10 is used at a place where an electrical signal is converted into an optical signal (the most upstream side of the optical transmission system), the electrical signal is converted into an optical signal (predetermined as in the optical module 10a shown in FIG. 1).
  • the light emitting element 11 a that emits as a laser beam having a divergence angle (divergence angle) corresponds to the light emitting member 11.
  • This type of light emitting element 11a is generally mounted on the output side substrate B1.
  • an optical fiber that transmits an optical signal like the optical module 10b shown in FIG. 11 b corresponds to the light emitting member 11.
  • the emission-side light transmission member 12 is a member formed of a material that transmits light emitted from the light emission member 11 (light that transmits a signal).
  • the emission side light transmission member 12 has an emission surface 122 from which the transmitted light is emitted.
  • the optical module 10 according to the present embodiment is an element constituting the optical transmission system, the emission-side light transmitting member 12 has a counterpart optical module (an incident-side light to be described later) having a member that transmits an optical signal. It has the output side connector part 121 for connecting to the transmissive member 22).
  • the light emitting element 11a is the optical module 10a corresponding to the light emitting member 11
  • a member called a holder or the like becomes the emitting side light transmitting member 12a.
  • the light emitting side holder 12a has a cylindrical portion 124 surrounding the light emitting element 11a, and the tip of the cylindrical portion 124 is a member fixed to the output side substrate B1 on which the light emitting element 11a is mounted by soldering or the like. is there.
  • the optical fiber 11b is the optical module 10b corresponding to the light emitting member 11
  • the optical connector (or the ferrule itself) having the ferrule part to which the optical fiber 11b is fixed becomes the emitting side light transmitting member 12b.
  • the emission-side light transmitting member 12 of the optical module 10 causes the light emitted from the light emission member 11 to be emitted from the emission surface 122 as divergent light (laser light having a predetermined divergence angle (divergence angle)).
  • the divergence angle of the divergent light is defined based on the eye safety standard. Specifically, it is as follows.
  • the so-called eye safety standard has a diameter d that passes through the center of the optical axis X and is orthogonal to the optical axis X at a predetermined distance D along the optical axis X from the point where the light is emitted.
  • the present invention increases the component (light ray) that falls outside the virtual circle of the diameter d at a point that is a predetermined distance D away from the emission surface 122 of the optical module 10 along the optical axis X.
  • the light emitted from the emission surface 122 is not divergent light but is divergent light. That is, the divergence angle is set so that the optical power in the virtual circle is not more than a predetermined reference value.
  • an adjustment lens portion 123 may be provided on the emission side light transmitting member 12a as in the optical module 10a shown in FIG. That is, the adjustment lens part 123 into which the light emitted from the light emitting member 11 enters is provided, and the divergence angle of the light emitted from the emission surface 122 by passing through the adjustment lens part 123 satisfies the eye safety reference. It should be satisfied.
  • the adjustment as described above is performed if the light divergence angle when the light emitted from the light emitting member 11 is emitted as it is satisfies the eye safety standard.
  • the lens unit 123 may not be used.
  • the divergence angle of light the smaller the optical power in the imaginary circle. Therefore, if the eye safety standard is satisfied, the divergence angle may simply be increased. However, if the divergence angle is increased too much, loss in the transmission process increases, and it becomes difficult to design the focusing lens unit 222 described later. Therefore, the divergence angle is within the range that satisfies the eye safety standard. Is preferably small (close to parallel light). Regardless of the presence or absence of the adjusting lens portion 123, the refraction of the light emitted from the emission surface 122 is also considered in consideration of refraction at the emission surface 122 (the interface between the material constituting the emission-side light transmitting member 12 and air). It is necessary to set the divergence angle (design the adjustment lens unit 123).
  • the divergent light emitted from the emission surface 122 is converged by the focusing lens unit 222 provided in the counterpart module (incident side light transmitting member 22) connected to the optical module 10 according to the present embodiment, and is focused on the light incident member 21.
  • Incident light (refer to the description of the optical transmission system 1 described later for details of this point).
  • the light emitted from the emission surface 122 is not divergent light but divergent light, thereby reducing the transmitted optical power and reducing the eye safety standard. Can be satisfied.
  • the optical transmission system 1 has the optical module 10 (at least part of the path from the light emitting unit (light emitting element 11a) that emits an optical signal to the light receiving unit (light receiving element 21a) that receives the optical signal.
  • the optical module 10 at least part of the path from the light emitting unit (light emitting element 11a) that emits an optical signal to the light receiving unit (light receiving element 21a) that receives the optical signal.
  • an emission side optical module 10 an emission side optical module
  • an incident side optical module 20 connected to the emission side optical module 10.
  • the exit-side optical module 10 is configured such that the light emitted from the exit surface 122 is divergent light that satisfies the eye safety standard as described above.
  • the incident side optical module 20 is an optical module into which the light (optical signal) emitted from the emission side optical module 10 enters. In other words, in the optical transmission system 1, the optical module is located on the downstream side of a certain outgoing-side optical module 10.
  • the incident side optical module 20 includes an incident side light transmitting member 22 and a light incident member 21.
  • the incident side light transmission member 22 is a member formed of a material that transmits light emitted from the emission surface 122 of the emission side light transmission member 12.
  • the incident-side light transmitting member 22 includes an incident-side connector portion 221 that can be fitted into the emitting-side connector portion 121 provided in the emitting-side light transmitting member 12.
  • This connector part structure of a connector part
  • the optical axis X of the exit side optical module 10 each member constituting the exit side optical module
  • the entrance side optical module 20 incident side optical module 20.
  • the optical axes X of the members constituting the same coincide with each other.
  • the light receiving element 21a is the incident side optical module 20a corresponding to the light emitting member 21
  • a member referred to as a holder or the like corresponds to the incident side light transmitting member 22a.
  • the light receiving side holder 22a has a cylindrical portion 223 surrounding the light receiving element 21a, and the tip of the cylindrical portion 223 is a member fixed to the input side substrate B2 on which the light receiving element 21a is mounted by soldering or the like. is there.
  • the optical fiber 11b is the emission side optical module 10b corresponding to the light emitting member 11
  • the optical connector (or the ferrule itself) having the ferrule part to which the optical fiber 11b is fixed corresponds to the incident side light transmitting member 22b. Become.
  • a portion 222 is provided. That is, the divergent light changes to focused light (laser light having a predetermined focusing angle) by passing through the focusing lens unit 222.
  • the converging lens unit 222 is set to have a converging angle so that the converging light transmitted through the incident-side light transmitting member 22 can enter the light incident member 21.
  • the light incident member 21 refers to an optical member provided in the incident side optical module 20.
  • the optical fiber 21b corresponds to the light incident member 21, and is used at a place where an optical signal is converted into an electric signal (the most downstream side of the optical transmission system 1).
  • the light receiving element 21 a that converts an optical signal into an electric signal corresponds to the light incident member 21.
  • the focusing lens unit 222 is arranged so that the focal point of the focused light is located on the light incident surface of the light incident member 21 (the upstream end surface of the optical fiber 21b or the light incident portion of the light receiving element 21a) (the light incident surface of the light incident member 21). To be condensed).
  • the optical transmission system 1 includes a portion where the emission side optical module 10 (10a, 10b) and the incident side optical module 20 (20a, 20b) having such a configuration are connected.
  • the output side optical module 10 in which the light emitted from the emission surface 122 is divergent light and the incident side optical module 20 connected thereto may be alternately provided.
  • the light emitted from the emission surface 122 of all the emission-side optical modules 10 (the emission-side light transmitting members 12) is set as diverging light, that is, where in the transmission path Since the configuration is such that divergent light is emitted from the emission surface 122 even if the light is cut, the transmission system is excellent from the viewpoint of the eye safety.
  • the optical transmission system 1 shown in FIG. 6 includes a holder 30 mounted on the input-side board B2 that is a light transmitting member and an incident-side optical module 31 that is fitted to the holder 30 in order to share components. It is the same shape as the light emitting element 11a side. In this case, the light emitted from the incident-side optical module 31 connected to the holder 30 on the light receiving element 21a side becomes the convergent light, but the light emitted from the other incident-side optical modules is divergent light. It becomes.
  • optical module 10 having such a configuration (exit side) and the optical transmission system 1 including the output side optical module 10 and the incident side optical module have the following operational effects.
  • the optical module 10 In the optical module 10 according to the present embodiment (exit side), light emitted from the exit surface 122 of the exit side light transmitting member 12 is divergent light. Therefore, the light emitted from the emission surface 122 spreads in the plane direction orthogonal to the optical axis X as the distance from the emission surface 122 increases. That is, the optical power within the predetermined range (within the imaginary circle having the diameter d) at a position away from the output surface 122 by a predetermined length is equal to the optical power within the same range on the output surface 122 (the same). Smaller than the amount of light within the range). Therefore, the required eye safety standard can be satisfied without reducing the transmitted optical power.
  • the optical power within a predetermined range at a location separated by the predetermined length is increased or decreased by a change in the divergence angle of the diverging light emitted from the emission surface 122. Therefore, if the adjustment lens portion 123 through which light passes is provided in the emission side light transmitting member 12 as in the present embodiment, the eye safety required by the design of the adjustment lens portion 123 (refractive index adjustment).
  • the divergence angle that satisfies the standard can be set.
  • the diverging light emitted from the emission surface 122 of the emission side light transmission member 12 is provided on the incident side light transmission member 22 connected to the emission side light transmission member 12. If the light is converged by the converging lens unit 222 and is incident on the light incident member 21, transmission loss due to the divergent light generated from the light exit surface 122 hardly occurs.
  • the divergent light propagates in the space between the emission side optical module 10 and the incidence side optical module 20 (having a larger beam diameter than the conventional one), it can be attached to the emission surface 122 of the emission side optical module 10. It is hard to be affected by dust and the like.
  • the connector portions 121 and 221 are provided on the emission-side light transmission member 12 and the incident-side light transmission member 22, but the present invention is also applied to those in which such connector portions 121 and 221 are not provided.
  • the technical idea of the invention is applicable.
  • a relay connector that connects the emission side light transmission member 12 and the incident side light transmission member 22 may be used. That is, “the emission side light transmission member 12 and the incidence side light transmission member 22 can be connected” includes a configuration in which connection is possible using another member such as a relay connector shown in FIG. 7.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

Provided are an optical module and an optical transmission system that make it possible to meet a required eye safety standard without causing a loss in transmitting optical power. The optical module (10) is provided with: a light emission member (11) that emits light; and an emission-side light transmission member (12) that comprises a material that transmits light emitted from the light emission member (11), that has an emission surface (122) from which light that passes therethrough is emitted, and that can be connected to an entry-side light transmission member (22) having attached thereto a light entry member (21) into which light that is emitted from the light emission surface (122) enters. Light that is emitted from the emission surface (122) of the emission-side light transmission member (12) is divergent light.

Description

光モジュールおよび光伝送システムOptical module and optical transmission system
　本発明は、光信号を伝送するために用いられる光モジュール、およびこの光モジュールを用いた光伝送システムに関する。 The present invention relates to an optical module used for transmitting an optical signal, and an optical transmission system using the optical module.
　一般に光伝送システムおよび光コネクタには光源として指向性や集束性の高いレーザ光が用いられ、通常光学レンズによりレーザ光を集光して光ファイバに導入し、光ファイバの中継接続は光ファイバ同士を直接接続して光伝送を行う。このため、光ファイバからの出射光は発散光となる。これに対して、例えば、特許文献１に記載があるように、光ファイバの中継接続を、拡散する光ファイバからの出射光をコリメートレンズにより拡大平行光として、光伝送する方法がある。 In general, laser light with high directivity and focusing is used as a light source in optical transmission systems and optical connectors. Usually, laser light is collected by an optical lens and introduced into an optical fiber. Are connected directly to perform optical transmission. For this reason, the outgoing light from the optical fiber becomes divergent light. On the other hand, for example, as described in Patent Document 1, there is a method of performing optical transmission using a relay connection of an optical fiber by using a collimating lens as light emitted from a diffusing optical fiber as expanded parallel light.
特開２０１１－１６４１８２号公報JP 2011-164182 A
　このような拡大平行光により光伝送を行う方式では、送信、受信、中継のいずれの場合であっても、光コネクタの出射面からの出射光は平行光となり、光伝送を行うため光パワー（密度）も高い。光コネクタが嵌合され、情報を伝送する定常時には問題とならないが、光が到達しているか否かの確認などの光コネクタが非嵌合である非定常時には、人による作業も多く、当該光によって目に傷害を与えてしまう恐れがある。目に傷害を与えてしまうことを防止する（以下、当該考え方を「アイセーフティ」と称する）ために、例えば、ＩＥＣ規格やＥＮ規格などにも、アイセーフティの観点から定められた規格（ＩＥＣ６０８２５－１、ＥＮ６０８２５－１など）がある。 In such a system that performs optical transmission using expanded parallel light, the light emitted from the exit surface of the optical connector becomes parallel light regardless of whether transmission, reception, or relay is performed, and the optical power ( The density is also high. This is not a problem at the steady state when optical connectors are fitted and information is transmitted. However, when the optical connector is not fitted, such as checking whether light has arrived, there is much work by humans. May damage your eyes. In order to prevent injury to the eyes (hereinafter, this concept is referred to as “eye safety”), for example, the IEC standard and EN standard also include standards (IEC 60825) defined from the viewpoint of eye safety. 1, EN60825-1, etc.).
　光伝送には比較的高い光パワーが必要であり、上記アイセーフティの基準に従えば、光パワー（密度）によって保護眼鏡の着用、人の目に触れない閉空間でセンサーによる測定・評価が義務づけられ、作業性が著しく悪く、また困難であった。 Optical transmission requires relatively high optical power, and according to the above eye safety standards, it is obliged to wear protective glasses depending on the optical power (density), and to measure and evaluate with sensors in a closed space where human eyes do not touch. The workability was extremely poor and difficult.
　上記実情に鑑み、本発明が解決しようとする課題は、伝送する光パワーを減少させることなく、保護眼鏡の着用、人の目に触れない閉空間でセンサーによる測定・評価が義務づけられないアイセーフティ基準を満たすことができる光モジュールおよび光伝送システムを提供することにある。 In view of the above circumstances, the problem to be solved by the present invention is that eye safety that does not obligate measurement / evaluation by a sensor in a closed space that is not in contact with human eyes without wearing protective glasses without reducing the transmitted optical power. An object of the present invention is to provide an optical module and an optical transmission system that can satisfy the standards.
　上記課題を解決するため、本発明にかかる光モジュールは、光を出射する光出射部材と、この光出射部材からの出射光を透過する材料からなる部材であって、通過した光が出射される出射面を有し、この出射面より出射される光が入射する光入射部材が取り付けられた入射側光透過部材に接続可能である出射側光透過部材と、を備え、前記出射側光透過部材の出射面から出射される光が発散光であることを特徴とする。 In order to solve the above problems, an optical module according to the present invention is a member made of a light emitting member that emits light and a material that transmits light emitted from the light emitting member, and the light that has passed through is emitted. An emission-side light transmission member that has an emission surface and is connectable to an incident-side light transmission member to which a light incident member on which light emitted from the emission surface is incident is attached. The light emitted from the emission surface is divergent light.
　上記構成において、前記出射面から出射される発散光の発散角が所定の角度となるように、前記出射側光透過部材には前記光出射部材からの出射光が通過する調整レンズ部が設けられているとよい。 In the above configuration, the exit side light transmitting member is provided with an adjustment lens portion through which the light emitted from the light emitting member passes so that the divergence angle of the diverging light emitted from the emission surface becomes a predetermined angle. It is good to have.
　上記課題を解決するため、本発明にかかる光伝送システムは、光信号を発する発光部から光信号を受ける受光部に至るまでの経路の少なくとも一部に、請求項１または請求項２に記載の光モジュールである出射側光モジュールおよびこの出射側光モジュールに接続された入射側光モジュールを含む光伝送システムであって、前記入射側光モジュールは、前記出射側光モジュールの出射側光透過部材に接続可能であって光を透過する材料からなる入射側光透過部材、およびこの入射側光透過部材を通過した光が入射する光入射部材を有し、前記入射側光透過部材には、前記出射側光モジュールの出射側光透過部材の出射面から出射される発散光を、前記光入射部材に入射させるように集束させる集束レンズ部が設けられていることを特徴とする。 In order to solve the above-mentioned problems, an optical transmission system according to the present invention is provided on at least a part of a path from a light emitting unit that emits an optical signal to a light receiving unit that receives the optical signal. An optical transmission system including an output-side optical module that is an optical module and an incident-side optical module connected to the output-side optical module, wherein the incident-side optical module serves as an output-side light transmitting member of the output-side optical module An incident-side light transmitting member made of a material that can be connected and transmits light, and a light incident member on which light that has passed through the incident-side light transmitting member is incident. A converging lens unit is provided for converging the diverging light emitted from the exit surface of the exit side light transmitting member of the side light module so as to enter the light incident member. .
　本発明にかかる光モジュールは、出射側光透過部材の出射面から出射される光が発散光である。したがって、当該出射面から出射された光は、当該出射面から離れるに従い、光軸に直交する平面方向に広がっていく。つまり、出射面から所定長離れた箇所における所定範囲内の光パワー（所定範囲内にある光線量）は、出射面における同じ範囲内の光パワー（同じ範囲内の光線量）よりも小さくなる。そのため、伝送する光パワーを減少させることなく、要求されるアイセーフティ基準を満たすことができる。 In the optical module according to the present invention, light emitted from the emission surface of the emission side light transmitting member is divergent light. Therefore, the light emitted from the emission surface spreads in the plane direction orthogonal to the optical axis as it leaves the emission surface. That is, the optical power within a predetermined range (amount of light within the predetermined range) at a location that is a predetermined distance away from the exit surface is smaller than the optical power within the same range at the exit surface (amount of light within the same range). Therefore, the required eye safety standard can be satisfied without reducing the transmitted optical power.
　そして、上記本発明にかかる光伝送システムのように、出射側光透過部材の出射面から出射される発散光を、出射側光透過部材に接続される（直接接続されてもよいし、中継部材等を介して間接的に接続されてもよい）入射側光透過部材に設けられる集束レンズ部によって光入射部材に集光させるようにすれば、出射面から出射される光を発散光としたことによる伝送ロスはほとんど生じない。 And like the optical transmission system concerning the said invention, the diverging light radiate | emitted from the output surface of an output side light transmissive member is connected to an output side light transmissive member (it may be directly connected or a relay member) The light emitted from the exit surface may be diverged if the light is converged on the light incident member by the converging lens portion provided on the incident side light transmitting member. Almost no transmission loss occurs.
　上記所定長離れた箇所における所定範囲内の光パワーは、出射面から出射される発散光の発散角の変化により増減する。したがって、出射側光透過部材に光が通過する調整レンズ部を設ける構成とすれば、当該調整レンズ部の設計（屈折率の調整）により、要求されるアイセーフティ基準を満たすような発散角に設定できる。 The optical power within a predetermined range at a location separated by the predetermined length is increased or decreased by a change in the divergence angle of the divergent light emitted from the emission surface. Therefore, if the adjustment lens part that allows light to pass through is provided on the exit side light transmitting member, the divergence angle is set so as to satisfy the required eye safety standard by designing the adjustment lens part (adjusting the refractive index). it can.
本発明の一実施形態にかかる光モジュール（電気信号を光信号に変換する箇所（光伝送システムの最も上流側）に用いられるもの）の断面（ハッチングは省略）を模式的に示した図である。It is the figure which showed typically the cross section (hatching is abbreviate | omitted) of the optical module (thing used for the location (the most upstream side of an optical transmission system) which converts an electrical signal into an optical signal) concerning one Embodiment of this invention. . 本発明の一実施形態にかかる光モジュール（光モジュールが光伝送システムの途中位置（光ファイバ同士を光学的に接続する箇所）に用いられるもの）の断面（ハッチングは省略）を模式的に示した図である。1 schematically shows a cross-section (hatching is omitted) of an optical module according to an embodiment of the present invention (the optical module is used at an intermediate position of an optical transmission system (where optical fibers are optically connected)). FIG. 出射面から所定距離Ｄ離れた地点において直径ｄの仮想円外に外れる成分（光線）が存在するように、出射面から出射される光を発散光とした場合の模式図である。It is a schematic diagram when the light emitted from the emission surface is divergent light so that there is a component (light ray) deviating from the virtual circle with the diameter d at a point away from the emission surface by a predetermined distance D. 出射面から出射される光が平行光である場合を図３と対比して示した図である。It is the figure which showed the case where the light radiate | emitted from an output surface is parallel light in contrast with FIG. 本発明の一実施形態にかかる光伝送システムの模式図である。1 is a schematic diagram of an optical transmission system according to an embodiment of the present invention. 図５とは異なる光伝送システム（ホルダを発光素子側と受光素子側で同一形状にしたもの）の模式図である。FIG. 6 is a schematic view of an optical transmission system different from that of FIG. 5 (a holder having the same shape on the light emitting element side and the light receiving element side). 出射側光透過部材と入射側光透過部材と繋ぐ中継コネクタを用いた構成の模式図である。It is a schematic diagram of the structure using the relay connector which connects an output side light transmissive member and an incident side light transmissive member.
　以下、本発明の各実施形態について図面を参照して詳細に説明する。本発明の一実施形態にかかる光モジュール１０は、光出射部材１１および出射側光透過部材１２を備える。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. An optical module 10 according to an embodiment of the present invention includes a light emitting member 11 and an emitting side light transmitting member 12.
　光出射部材１１は、伝送すべき信号を構成する光を出射する部材である。例えば、当該光モジュール１０が電気信号を光信号に変換する箇所（光伝送システムの最も上流側）に用いられるものであれば、図１に示す光モジュール１０ａのように電気信号を光信号（所定の広がり角（発散角）をもつレーザ光）として出射する発光素子１１ａが光出射部材１１に相当することになる。この種の発光素子１１ａは一般的に出力側の基板Ｂ１に搭載される。また、当該光モジュール１０が光伝送システムの途中位置（光ファイバ同士を光学的に接続する箇所）に用いられるものであれば、図２に示す光モジュール１０ｂのように光信号を伝送する光ファイバ１１ｂが光出射部材１１に相当することになる。 The light emitting member 11 is a member that emits light constituting a signal to be transmitted. For example, if the optical module 10 is used at a place where an electrical signal is converted into an optical signal (the most upstream side of the optical transmission system), the electrical signal is converted into an optical signal (predetermined as in the optical module 10a shown in FIG. 1). The light emitting element 11 a that emits as a laser beam having a divergence angle (divergence angle) corresponds to the light emitting member 11. This type of light emitting element 11a is generally mounted on the output side substrate B1. In addition, if the optical module 10 is used at an intermediate position in the optical transmission system (a place where optical fibers are optically connected), an optical fiber that transmits an optical signal like the optical module 10b shown in FIG. 11 b corresponds to the light emitting member 11.
　出射側光透過部材１２は、光出射部材１１から出射された光（信号を伝送する光）を透過する材料で形成された部材である。出射側光透過部材１２は、透過した光が出射される出射面１２２を有する。また、本実施形態にかかる光モジュール１０は光伝送システムを構成する一要素であるため、出射側光透過部材１２は光信号を伝送する対象となる部材を有する相手方光モジュール（後述する入射側光透過部材２２）に接続するための出射側コネクタ部１２１を有する。 The emission-side light transmission member 12 is a member formed of a material that transmits light emitted from the light emission member 11 (light that transmits a signal). The emission side light transmission member 12 has an emission surface 122 from which the transmitted light is emitted. In addition, since the optical module 10 according to the present embodiment is an element constituting the optical transmission system, the emission-side light transmitting member 12 has a counterpart optical module (an incident-side light to be described later) having a member that transmits an optical signal. It has the output side connector part 121 for connecting to the transmissive member 22).
　上記発光素子１１ａが光出射部材１１に相当する光モジュール１０ａの場合、ホルダなどと称される部材が出射側光透過部材１２ａとなる。発光側のホルダ１２ａは、発光素子１１ａを囲む筒状部１２４を有し、当該筒状部１２４の先端が発光素子１１ａが実装される出力側の基板Ｂ１にハンダ付け等により固定される部材である。上記光ファイバ１１ｂが光出射部材１１に相当する光モジュール１０ｂの場合、光ファイバ１１ｂが固定されるフェルール部を有する光コネクタ（またはフェルールそのもの）が出射側光透過部材１２ｂとなる。 In the case where the light emitting element 11a is the optical module 10a corresponding to the light emitting member 11, a member called a holder or the like becomes the emitting side light transmitting member 12a. The light emitting side holder 12a has a cylindrical portion 124 surrounding the light emitting element 11a, and the tip of the cylindrical portion 124 is a member fixed to the output side substrate B1 on which the light emitting element 11a is mounted by soldering or the like. is there. When the optical fiber 11b is the optical module 10b corresponding to the light emitting member 11, the optical connector (or the ferrule itself) having the ferrule part to which the optical fiber 11b is fixed becomes the emitting side light transmitting member 12b.
　本実施形態にかかる光モジュール１０の出射側光透過部材１２は、光出射部材１１から出射された光を出射面１２２から発散光（所定の広がり角（発散角）をもつレーザ光）として出射させる。この発散光の発散角（レーザ光の広がり角）は、アイセーフティ基準に基づいて規定される。具体的には次の通りである。 The emission-side light transmitting member 12 of the optical module 10 according to the present embodiment causes the light emitted from the light emission member 11 to be emitted from the emission surface 122 as divergent light (laser light having a predetermined divergence angle (divergence angle)). . The divergence angle of the divergent light (the spread angle of the laser light) is defined based on the eye safety standard. Specifically, it is as follows.
　図３に示すように、いわゆるアイセーフティ規格は、光が出射される地点から光軸Ｘに沿って所定距離Ｄ離れた地点において、中心を光軸Ｘが通りかつ光軸Ｘに直交する直径ｄの仮想円内（光軸Ｘからｄ／２の距離内）での光パワーが所定の基準値以下であることを求めたものである（例えば、Ｄ＝７０ｍｍ、ｄ＝７ｍｍに設定される）。本発明は、このアイセーフティ規格に従い、光モジュール１０の出射面１２２から光軸Ｘに沿って所定距離Ｄ離れた地点において、直径ｄの仮想円外に外れる成分（光線）を増加させるために、出射面１２２から出射される光を平行光とはせずに発散光としたものである。つまり、上記発散角は、当該仮想円内における光パワーが所定の基準値以下となるように設定される。 As shown in FIG. 3, the so-called eye safety standard has a diameter d that passes through the center of the optical axis X and is orthogonal to the optical axis X at a predetermined distance D along the optical axis X from the point where the light is emitted. Of the optical circle (within a distance of d / 2 from the optical axis X) is determined to be equal to or less than a predetermined reference value (for example, D = 70 mm and d = 7 mm are set). . In accordance with this eye safety standard, the present invention increases the component (light ray) that falls outside the virtual circle of the diameter d at a point that is a predetermined distance D away from the emission surface 122 of the optical module 10 along the optical axis X. The light emitted from the emission surface 122 is not divergent light but is divergent light. That is, the divergence angle is set so that the optical power in the virtual circle is not more than a predetermined reference value.
　なお、図４に示すように、出射面１２２から出射される光を平行光とした場合には、発散光とした場合よりも多くの光線が仮想円内に入り込む光となるから、上記のようなアイセーフティ規格に基づいて規定されるアイセーフティ基準を満たすためには、出射される光パワー（伝送する光パワー）自体を低下させる必要が生じる。 As shown in FIG. 4, when the light emitted from the emission surface 122 is parallel light, more light enters the virtual circle than when divergent light is used. In order to satisfy the eye safety standards defined based on the eye safety standards, it is necessary to reduce the emitted optical power (transmitted optical power) itself.
　このような発散角の光が出射されるようにするために、図１に示す光モジュール１０ａのように出射側光透過部材１２ａに調整レンズ部１２３を設けてもよい。すなわち、光出射部材１１から出射された光が入射する調整レンズ部１２３を設け、この調整レンズ部１２３を通過することによって、出射面１２２から出射される光の発散角が、上記アイセーフティ基準を満たすようにすればよい。 In order to emit light having such a divergence angle, an adjustment lens portion 123 may be provided on the emission side light transmitting member 12a as in the optical module 10a shown in FIG. That is, the adjustment lens part 123 into which the light emitted from the light emitting member 11 enters is provided, and the divergence angle of the light emitted from the emission surface 122 by passing through the adjustment lens part 123 satisfies the eye safety reference. It should be satisfied.
　また、図２に示す光モジュール１０ｂのように、光出射部材１１から出射された光をそのまま出射させた場合の光の発散角が、アイセーフティ基準を満たすものであれば、上記のような調整レンズ部１２３を用いなくてもよい。 Further, as in the optical module 10b shown in FIG. 2, the adjustment as described above is performed if the light divergence angle when the light emitted from the light emitting member 11 is emitted as it is satisfies the eye safety standard. The lens unit 123 may not be used.
　なお、光の発散角を大きくすればするほど上記仮想円内での光パワーが小さくなるため、アイセーフティ基準を満たすためであれば単純に発散角を大きくすればよいということになる。しかし、発散角を大きくしすぎると、伝送過程での損失が大きくなる、後述する集束レンズ部２２２の設計が困難になる、といった問題が生ずるため、アイセーフティ基準を満たす範囲内で、できるだけ発散角を小さく（平行光に近く）することが好ましい。また、調整レンズ部１２３の有無によらず、出射面１２２（出射側光透過部材１２を構成する材料と空気との界面）での屈折も考慮した上で、出射面１２２から出射される光の発散角を設定する（調整レンズ部１２３を設計する）必要がある。 It should be noted that the greater the divergence angle of light, the smaller the optical power in the imaginary circle. Therefore, if the eye safety standard is satisfied, the divergence angle may simply be increased. However, if the divergence angle is increased too much, loss in the transmission process increases, and it becomes difficult to design the focusing lens unit 222 described later. Therefore, the divergence angle is within the range that satisfies the eye safety standard. Is preferably small (close to parallel light). Regardless of the presence or absence of the adjusting lens portion 123, the refraction of the light emitted from the emission surface 122 is also considered in consideration of refraction at the emission surface 122 (the interface between the material constituting the emission-side light transmitting member 12 and air). It is necessary to set the divergence angle (design the adjustment lens unit 123).
　出射面１２２から出射された発散光は、本実施形態にかかる光モジュール１０に接続される相手方モジュール（入射側光透過部材２２）に設けられた集束レンズ部２２２によって集束されて光入射部材２１に入射する（かかる点の詳細については後述の光伝送システム１の説明を参照）。このように、本実施形態にかかる光モジュール１０によれば、出射面１２２から出射される光を平行光ではなく発散光とすることにより、伝送する光パワーを減少させることなく、アイセーフティ基準を満足することができる。 The divergent light emitted from the emission surface 122 is converged by the focusing lens unit 222 provided in the counterpart module (incident side light transmitting member 22) connected to the optical module 10 according to the present embodiment, and is focused on the light incident member 21. Incident light (refer to the description of the optical transmission system 1 described later for details of this point). As described above, according to the optical module 10 according to the present embodiment, the light emitted from the emission surface 122 is not divergent light but divergent light, thereby reducing the transmitted optical power and reducing the eye safety standard. Can be satisfied.
　以下、上記光モジュール１０を用いた本発明の一実施形態にかかる光伝送システム１について説明する。本実施形態にかかる光伝送システム１は、光信号を発する発光部（発光素子１１ａ）から光信号を受ける受光部（受光素子２１ａ）に至るまでの経路の少なくとも一部に、上記光モジュール１０（以下、出射側光モジュール１０と称する）およびこの出射側光モジュール１０に接続された入射側光モジュール２０を含むものである。 Hereinafter, an optical transmission system 1 according to an embodiment of the present invention using the optical module 10 will be described. The optical transmission system 1 according to the present embodiment has the optical module 10 (at least part of the path from the light emitting unit (light emitting element 11a) that emits an optical signal to the light receiving unit (light receiving element 21a) that receives the optical signal. Hereinafter, it is referred to as an emission side optical module 10) and an incident side optical module 20 connected to the emission side optical module 10.
　出射側光モジュール１０は、上述したように出射面１２２から出射される光がアイセーフティ基準を満たす発散光に設定されるものである。入射側光モジュール２０は、出射側光モジュール１０から出射された光（光信号）が進入する光モジュールである。すなわち、光伝送システム１において、ある出射側光モジュール１０の下流側に位置する光モジュールである。この入射側光モジュール２０は、入射側光透過部材２２および光入射部材２１を有する。 The exit-side optical module 10 is configured such that the light emitted from the exit surface 122 is divergent light that satisfies the eye safety standard as described above. The incident side optical module 20 is an optical module into which the light (optical signal) emitted from the emission side optical module 10 enters. In other words, in the optical transmission system 1, the optical module is located on the downstream side of a certain outgoing-side optical module 10. The incident side optical module 20 includes an incident side light transmitting member 22 and a light incident member 21.
　入射側光透過部材２２は、出射側光透過部材１２の出射面１２２から出射された光を透過する材料で形成された部材である。入射側光透過部材２２は、出射側光透過部材１２に設けられた出射側のコネクタ部１２１に嵌合可能な入射側のコネクタ部２２１を有する。このコネクタ部同士の嵌合構造（コネクタ部の構成）については、公知の光コネクタの嵌合構造が適用できるため詳細な説明は省略する。出射側のコネクタ部１２１と入射側のコネクタ部２２１の嵌合により、出射側光モジュール１０（出射側光モジュールを構成する各部材）の光軸Ｘと入射側光モジュール２０（入射側光モジュール２０を構成する各部材）の光軸Ｘが一致する。 The incident side light transmission member 22 is a member formed of a material that transmits light emitted from the emission surface 122 of the emission side light transmission member 12. The incident-side light transmitting member 22 includes an incident-side connector portion 221 that can be fitted into the emitting-side connector portion 121 provided in the emitting-side light transmitting member 12. About the fitting structure of this connector part (structure of a connector part), since the fitting structure of a well-known optical connector can be applied, detailed description is abbreviate | omitted. By fitting the connector part 121 on the exit side and the connector part 221 on the incident side, the optical axis X of the exit side optical module 10 (each member constituting the exit side optical module) and the entrance side optical module 20 (incident side optical module 20). The optical axes X of the members constituting the same coincide with each other.
　上記受光素子２１ａが光出射部材２１に相当する入射側光モジュール２０ａの場合、ホルダなどと称される部材が入射側光透過部材２２ａに相当することになる。受光側のホルダ２２ａは、受光素子２１ａを囲む筒状部２２３を有し、当該筒状部２２３の先端が受光素子２１ａが実装される入力側の基板Ｂ２にハンダ付け等により固定される部材である。上記光ファイバ１１ｂが光出射部材１１に相当する出射側光モジュール１０ｂの場合、光ファイバ１１ｂが固定されるフェルール部を有する光コネクタ（またはフェルールそのもの）が入射側光透過部材２２ｂに相当することになる。 When the light receiving element 21a is the incident side optical module 20a corresponding to the light emitting member 21, a member referred to as a holder or the like corresponds to the incident side light transmitting member 22a. The light receiving side holder 22a has a cylindrical portion 223 surrounding the light receiving element 21a, and the tip of the cylindrical portion 223 is a member fixed to the input side substrate B2 on which the light receiving element 21a is mounted by soldering or the like. is there. When the optical fiber 11b is the emission side optical module 10b corresponding to the light emitting member 11, the optical connector (or the ferrule itself) having the ferrule part to which the optical fiber 11b is fixed corresponds to the incident side light transmitting member 22b. Become.
　図５、図６に示すように、入射側光透過部材２２における出射側光透過部材１２側には、出射側光透過部材１２の出射面１２２から出射された発散光を集束させるための集束レンズ部２２２が設けられている。すなわち、この集束レンズ部２２２を通過することによって発散光が集束光（所定の集束角をもつレーザ光）に変化する。集束レンズ部２２２は、入射側光透過部材２２を透過する集束光が光入射部材２１に入射することができるような集束角になるように設定される。 As shown in FIGS. 5 and 6, a converging lens for converging diverging light emitted from the exit surface 122 of the exit side light transmitting member 12 on the exit side light transmitting member 12 side of the entrance side light transmitting member 22. A portion 222 is provided. That is, the divergent light changes to focused light (laser light having a predetermined focusing angle) by passing through the focusing lens unit 222. The converging lens unit 222 is set to have a converging angle so that the converging light transmitted through the incident-side light transmitting member 22 can enter the light incident member 21.
　ここで、光入射部材２１とは、入射側光モジュール２０に設けられた光学部材のことを指す。例えば、伝送経路の途中に用いられる入射側光モジュール２０ｂであれば光ファイバ２１ｂが光入射部材２１に相当し、光信号を電気信号に変換する箇所（光伝送システム１の最も下流側）に用いられる入射側光モジュール２０ａであれば、光信号を電気信号に変換する受光素子２１ａが光入射部材２１に相当することになる。集束レンズ部２２２は、集束光の焦点が光入射部材２１の光入射面（光ファイバ２１ｂの上流側端面や受光素子２１ａの光入射部）に位置するように（光入射部材２１の光入射面に集光されるように）設定する。 Here, the light incident member 21 refers to an optical member provided in the incident side optical module 20. For example, in the case of the incident-side optical module 20b used in the middle of the transmission path, the optical fiber 21b corresponds to the light incident member 21, and is used at a place where an optical signal is converted into an electric signal (the most downstream side of the optical transmission system 1). In the case of the incident side optical module 20 a, the light receiving element 21 a that converts an optical signal into an electric signal corresponds to the light incident member 21. The focusing lens unit 222 is arranged so that the focal point of the focused light is located on the light incident surface of the light incident member 21 (the upstream end surface of the optical fiber 21b or the light incident portion of the light receiving element 21a) (the light incident surface of the light incident member 21). To be condensed).
　本実施形態にかかる光伝送システム１は、このような構成の出射側光モジュール１０（１０ａ、１０ｂ）と入射側光モジュール２０（２０ａ、２０ｂ）が接続された箇所を含むものである。図５に示すように、出射面１２２から出射される光が発散光である出射側光モジュール１０とそれに接続される入射側光モジュール２０が交互に設けられた構成としてもよいし、図６に示すように出射面１２２から出射される光が発散光である出射側光モジュール１０とそれに接続される入射側光モジュール２０をシステムの少なくとも一部に含む構成としてもよい。 The optical transmission system 1 according to the present embodiment includes a portion where the emission side optical module 10 (10a, 10b) and the incident side optical module 20 (20a, 20b) having such a configuration are connected. As shown in FIG. 5, the output side optical module 10 in which the light emitted from the emission surface 122 is divergent light and the incident side optical module 20 connected thereto may be alternately provided. As shown in the drawing, it is also possible to employ a configuration in which at least a part of the system includes the emission side optical module 10 in which the light emitted from the emission surface 122 is diverging light and the incident side optical module 20 connected thereto.
　図５に示した光伝送システム１は、全ての出射側光モジュール１０（出射側光透過部材１２）の出射面１２２から出射される光が発散光に設定されている、すなわち伝送経路のどこで経路が切断されていても出射面１２２からは発散光が出射される構成であるため、上記アイセーフティの観点でみれば優れた伝送システムとなる。一方、図６に示した光伝送システム１は、部品の共通化を図るため、光透過部材である入力側の基板Ｂ２に実装されるホルダ３０およびそれに嵌合する入射側の光モジュール３１を、発光素子１１ａ側と同一形状にしたものである。この場合には、受光素子２１ａ側のホルダ３０に接続される入射側の光モジュール３１から出射される光が集束光となるが、それ以外の入射側の光モジュールから出射される光は発散光となる。 In the optical transmission system 1 shown in FIG. 5, the light emitted from the emission surface 122 of all the emission-side optical modules 10 (the emission-side light transmitting members 12) is set as diverging light, that is, where in the transmission path Since the configuration is such that divergent light is emitted from the emission surface 122 even if the light is cut, the transmission system is excellent from the viewpoint of the eye safety. On the other hand, the optical transmission system 1 shown in FIG. 6 includes a holder 30 mounted on the input-side board B2 that is a light transmitting member and an incident-side optical module 31 that is fitted to the holder 30 in order to share components. It is the same shape as the light emitting element 11a side. In this case, the light emitted from the incident-side optical module 31 connected to the holder 30 on the light receiving element 21a side becomes the convergent light, but the light emitted from the other incident-side optical modules is divergent light. It becomes.
　このような構成を有する本実施形態にかかる（出射側）光モジュール１０や、この出射側光モジュール１０および入射側光モジュールを含む光伝送システム１によれば、次のような作用効果が奏される。 The optical module 10 according to the present embodiment having such a configuration (exit side) and the optical transmission system 1 including the output side optical module 10 and the incident side optical module have the following operational effects. The
　本実施形態にかかる（出射側）光モジュール１０は、出射側光透過部材１２の出射面１２２から出射される光が発散光である。したがって、当該出射面１２２から出射された光は、当該出射面１２２から離れるに従い、光軸Ｘに直交する平面方向に広がっていく。つまり、出射面１２２から所定長離れた箇所における所定範囲内（上記直径ｄの仮想円内）の光パワー（所定範囲内にある光線量）は、出射面１２２における同じ範囲内の光パワー（同じ範囲内の光線量）よりも小さくなる。そのため、伝送する光パワーを減少させることなく、要求されるアイセーフティ基準を満たすことができる。 In the optical module 10 according to the present embodiment (exit side), light emitted from the exit surface 122 of the exit side light transmitting member 12 is divergent light. Therefore, the light emitted from the emission surface 122 spreads in the plane direction orthogonal to the optical axis X as the distance from the emission surface 122 increases. That is, the optical power within the predetermined range (within the imaginary circle having the diameter d) at a position away from the output surface 122 by a predetermined length is equal to the optical power within the same range on the output surface 122 (the same). Smaller than the amount of light within the range). Therefore, the required eye safety standard can be satisfied without reducing the transmitted optical power.
　上記所定長離れた箇所における所定範囲内の光パワーは、出射面１２２から出射される発散光の発散角の変化により増減する。したがって、本実施形態のように出射側光透過部材１２に光が通過する調整レンズ部１２３を設ける構成とすれば、当該調整レンズ部１２３の設計（屈折率の調整）により、要求されるアイセーフティ基準を満たすような発散角に設定できる。 The optical power within a predetermined range at a location separated by the predetermined length is increased or decreased by a change in the divergence angle of the diverging light emitted from the emission surface 122. Therefore, if the adjustment lens portion 123 through which light passes is provided in the emission side light transmitting member 12 as in the present embodiment, the eye safety required by the design of the adjustment lens portion 123 (refractive index adjustment). The divergence angle that satisfies the standard can be set.
　本実施形態にかかる光伝送システム１のように、出射側光透過部材１２の出射面１２２から出射される発散光を、出射側光透過部材１２に接続される入射側光透過部材２２に設けられる集束レンズ部２２２で集束させて光入射部材２１に入射させるようにすれば、出射面１２２から出射される光を発散光としたことによる伝送ロスはほとんど生じない。 As in the optical transmission system 1 according to the present embodiment, the diverging light emitted from the emission surface 122 of the emission side light transmission member 12 is provided on the incident side light transmission member 22 connected to the emission side light transmission member 12. If the light is converged by the converging lens unit 222 and is incident on the light incident member 21, transmission loss due to the divergent light generated from the light exit surface 122 hardly occurs.
　また、出射側光モジュール１０と入射側光モジュール２０の間の空間を伝搬するのが発散光となる（従来よりもビーム径が大きい）ため、出射側光モジュール１０の出射面１２２に付着する可能性がある埃等の影響を受けにくい。 Further, since the divergent light propagates in the space between the emission side optical module 10 and the incidence side optical module 20 (having a larger beam diameter than the conventional one), it can be attached to the emission surface 122 of the emission side optical module 10. It is hard to be affected by dust and the like.
　以上、本発明の実施の形態について詳細に説明したが、本発明は上記実施の形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の改変が可能である。 The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
　上記実施形態では、出射側光透過部材１２や入射側光透過部材２２にコネクタ部１２１、２２１が設けられることを説明したが、このようなコネクタ部１２１、２２１が設けられていないものにも本発明の技術的思想は適用可能である。例えば、図７に示すように、出射側光透過部材１２と入射側光透過部材２２と繋ぐ中継コネクタを用いるものであってもよい。つまり、「出射側光透過部材１２と入射側光透過部材２２が接続可能である」とは、図７に示す中継コネクタのような別部材を用いて接続可能な構成を含むものである。 In the above-described embodiment, it has been described that the connector portions 121 and 221 are provided on the emission-side light transmission member 12 and the incident-side light transmission member 22, but the present invention is also applied to those in which such connector portions 121 and 221 are not provided. The technical idea of the invention is applicable. For example, as shown in FIG. 7, a relay connector that connects the emission side light transmission member 12 and the incident side light transmission member 22 may be used. That is, “the emission side light transmission member 12 and the incidence side light transmission member 22 can be connected” includes a configuration in which connection is possible using another member such as a relay connector shown in FIG. 7.

Claims (3)

  1. 　光を出射する光出射部材と、
    この光出射部材からの出射光を透過する材料からなる部材であって、通過した光が出射される出射面を有し、この出射面より出射される光が入射する光入射部材が取り付けられた入射側光透過部材に接続可能である出射側光透過部材と、
    を備え、
    　前記出射側光透過部材の出射面から出射される光が発散光であることを特徴とする光モジュール。     A light emitting member that emits light;
    A member made of a material that transmits the light emitted from the light emitting member, and having a light exit surface from which the light that has passed is emitted, and a light incident member that receives light emitted from the light exit surface is attached. An output side light transmitting member connectable to the incident side light transmitting member; and
    With
    An optical module, wherein light emitted from an emission surface of the emission side light transmitting member is divergent light.
  2. 　前記出射面から出射される発散光の発散角が所定の角度となるように、前記出射側光透過部材には前記光出射部材からの出射光が通過する調整レンズ部が設けられていることを特徴とする請求項１に記載の光モジュール。 The exit side light transmitting member is provided with an adjustment lens portion through which the emitted light from the light emitting member passes so that the divergence angle of the divergent light emitted from the emission surface becomes a predetermined angle. The optical module according to claim 1.
  3. 　光信号を発する発光部から光信号を受ける受光部に至るまでの経路の少なくとも一部に、請求項１または請求項２に記載の光モジュールである出射側光モジュールおよびこの出射側光モジュールに接続された入射側光モジュールを含む光伝送システムであって、
    　前記入射側光モジュールは、前記出射側光モジュールの出射側光透過部材に接続可能であって光を透過する材料からなる入射側光透過部材、およびこの入射側光透過部材を通過した光が入射する光入射部材を有し、
    前記入射側光透過部材には、前記出射側光モジュールの出射側光透過部材の出射面から出射される発散光を、前記光入射部材に入射させるように集束させる集束レンズ部が設けられていることを特徴とする光伝送システム。     The emission side optical module which is the optical module according to claim 1 or 2 and the emission side optical module are connected to at least a part of a path from the light emitting part which emits the optical signal to the light receiving part which receives the optical signal. An optical transmission system including an incident side optical module,
    The incident side optical module is connectable to the outgoing side light transmitting member of the outgoing side optical module and is made of an incident side light transmitting member made of a material that transmits light, and light that has passed through the incident side light transmitting member is incident A light incident member
    The incident side light transmitting member is provided with a converging lens portion for converging the diverging light emitted from the emission surface of the emission side light transmitting member of the emission side optical module so as to enter the light incident member. An optical transmission system characterized by that.
PCT/JP2013/084078 2013-01-15 2013-12-19 Optical module and optical transmission system WO2014112281A1 (en)

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JP2000047071A (en) * 1998-05-27 2000-02-18 Sharp Corp Optical signal transmission and reception module, optical signal transmission and reception repeater and optical signal transmission and reception system using them

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Publication number Priority date Publication date Assignee Title
JP2000047071A (en) * 1998-05-27 2000-02-18 Sharp Corp Optical signal transmission and reception module, optical signal transmission and reception repeater and optical signal transmission and reception system using them

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10317631B2 (en) 2015-09-30 2019-06-11 Sony Corporation Optical communication connector to restrain direct emission of collimated light

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