WO2019105048A1 - 光发射次模块及光收发组件 - Google Patents

光发射次模块及光收发组件 Download PDF

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Publication number
WO2019105048A1
WO2019105048A1 PCT/CN2018/096864 CN2018096864W WO2019105048A1 WO 2019105048 A1 WO2019105048 A1 WO 2019105048A1 CN 2018096864 W CN2018096864 W CN 2018096864W WO 2019105048 A1 WO2019105048 A1 WO 2019105048A1
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WO
WIPO (PCT)
Prior art keywords
light
lens
insert
optical
module according
Prior art date
Application number
PCT/CN2018/096864
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English (en)
French (fr)
Inventor
胡驰昊
周创
曾小军
温晔
Original Assignee
华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18883262.0A priority Critical patent/EP3705922A4/en
Publication of WO2019105048A1 publication Critical patent/WO2019105048A1/zh
Priority to US16/881,602 priority patent/US11243357B2/en

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Classifications

    • 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
    • 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
    • G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
    • 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
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • 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
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/43—Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/1805—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for prisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters

Definitions

  • the present invention relates to a fiber optic communication device, and more particularly to a Transmitter Optical Sub-Assembly (TOSA) for optical fiber communication.
  • TOSA Transmitter Optical Sub-Assembly
  • the growth in video streaming, big data, and cloud computing has caused “data avalanches,” resulting in increased demand for server storage and data transfer capabilities.
  • the optoelectronic interconnect modules of enterprise networks and data centers are moving toward higher speed and higher density.
  • the optical transceiver component is an indispensable member of the optoelectronic interconnection module, and optical transmission is performed between the VCSEL (Vertical Cavity Surface Emitting Laser) and the optical fiber through the optical emission sub-module, in order to achieve reliable data rate at a faster data rate.
  • VCSEL Very Cavity Surface Emitting Laser
  • the embodiment of the invention provides a light-emitting sub-module, which has small reflection and return loss of the fiber end, and small signal attenuation.
  • an embodiment of the present invention provides a light emitting sub-module, including a prism main body, a first lens, and an insert, wherein the prism main body includes an optical entrance end and a light exit end, and the first lens Provided between the light-emitting end and the insert, the insert includes a contact end, the contact end is located at a surface of the insert away from the first lens, and a center of the contact end is located at the first lens At the focus of the optical path, the contact end is curved to be connected to the optical fiber without a gap, and the end surface reflection of the contact end is reduced.
  • the contact end of the insert and the optical fiber is arranged in a curved shape, and the contact end of the curved surface is in contact with the end surface of the optical fiber, so that the gapless connection can be realized, so that the optical transmission path between the plug and the optical fiber is performed. Without any air medium, light enters the fiber directly from the plug-in, reducing the end-face reflection at the contact end.
  • the insert includes a first end surface, a second end surface, and a circumferential surface connected between the first end surface and the second end surface, the first end surface facing the first lens, The second end surface faces away from the first lens, the second end surface has a curved surface as a whole, and the contact end is formed in a central region of the second end surface.
  • the second end surface may also include a curved surface and a pair of connecting surfaces on both sides of the curved surface.
  • the pair of connecting surfaces are respectively connected between the two ends of the curved surface and the circumferential surface, and the contact end is a pair of connections.
  • a pair of connecting faces may be symmetrically disposed on both sides of the arc surface, and the pair of connecting faces may be flat or other irregular surfaces.
  • the present application does not limit the specific shape of the second end face as long as the contact end of the central portion of the second end face is provided in a curved shape.
  • the prism body includes an integrally formed conductive portion and an assembly portion, and the assembly portion defines a receiving space.
  • the bottom of the receiving space is the light emitting end of the prism body, and the assembly portion includes a first end of the conductive portion and a second end remote from the first end, the receiving space forming an opening at the second end, the opening being for the insert and the fiber insertion
  • the circumferential surface of the insert is in contact with a side wall of the accommodating space.
  • the assembly portion may have a hollow sleeve shape, and the outer periphery of the assembly portion may further be provided with a protrusion, and the protrusion may be used to achieve a limit between the light emission sub-module and the peripheral component, for example, fixing the light emission secondary module to the optical transceiver.
  • the shape of the accommodating space in the assembly portion is matched with the optical fiber, and the optical fiber is inserted into the accommodating space, and the optical fiber is positioned by the contact between the outer surface of the optical fiber and the side wall of the accommodating space.
  • the insert is also inserted into the receiving space, and the axial position of the insert and the optical fiber can be determined simultaneously by the side wall of the receiving space.
  • the receiving space has a cylindrical or axisymmetric structure, and the central axis of the receiving space is the optical axis of the light emitting end of the prism body.
  • the first lens is integrally formed at the light exit end of the prism body, and the integrated structure can achieve higher light transmission efficiency and effectively reduce return loss.
  • the first lens may also be a split structure with the prism body, the first lens is mounted from the opening of the receiving space to the light exiting end, and the position of the first lens is defined by the limiting structure disposed at the position of the light exiting end.
  • the sidewall of the receiving space includes a limiting step, the limiting step faces the opening, and the limiting step is for abutting the first end surface of the insert.
  • the position of the insert is limited by the limiting step, so that after the insert is inserted into the receiving space, the contact end of the insert can be located at the focus of the first lens by abutting the limiting step.
  • the first end face of the insert and the limit step can be fixed by optical glue bonding.
  • the conducting portion includes a first surface, a second surface, and a reflecting surface, the light incident end is disposed on the first surface, and the light emitting end is disposed on one side of the second surface.
  • the side of the light-emitting surface disposed on the second surface means that the light-emitting surface may be disposed on the second surface, or may be disposed on the other surface adjacent to the second surface, and the assembly portion is coupled to the second surface,
  • the reflecting surface is for reflecting light incident from the light incident end to the light exiting end.
  • the present invention provides a reflecting surface between the light incident end and the light emitting end of the conducting portion, and reflects the light incident at the light incident end to the light emitting end through the reflecting surface, thereby reducing the plane size of the conducting portion and effectively utilizing the space.
  • the size makes the light-emitting sub-module have a small size and a good space occupancy.
  • the extending direction of the first surface is perpendicular to the extending direction of the second surface.
  • the perpendicularity described herein also includes substantially perpendicular, and the angle between the first surface and the second surface may be in a suitable range of about 90 degrees, for example, a range between 80 degrees and 100 degrees is referred to as substantially vertical.
  • the first surface is provided with a second lens
  • the second lens is integrally formed at the light incident end of the prism body. It can be understood that the second lens can also be a split structure with the prism body.
  • the prism body further includes a support portion connected to the first surface of the conductive portion, the support portion surrounding the second lens, and used to guide the conductive portion Supported on the substrate.
  • the support portion is connected to the substrate, and the support portion forms a closed enclosing space together with the substrate and the first surface.
  • the support portion and the substrate may be fixed and sealed by means of adhesive, and a waterproof structure may be provided to protect the light source device on the substrate.
  • a groove may be formed on the surface of the substrate, the waterproof glue is filled in the groove, and the alignment groove of the support portion is adhered to the groove through the waterproof glue, and one end of the support portion is embedded in the concave portion. In the groove, a waterproof structure is formed.
  • the optical constant of the dielectric of the insert is close to or the same as the optical constant of the medium of the optical fiber.
  • the medium optical constant of the insert is close to the optical constant of the optical fiber of the optical fiber.
  • the optical constant of the medium of the insert is greater than the optical constant of the medium of the air, and the difference between the optical constant of the optical medium of the insert and the optical constant of the optical medium of the optical fiber is as small as possible. It is ideal when the two are the same.
  • the present application further provides an optical transceiver assembly, including a substrate, a laser disposed on the substrate, and the light emitting submodule, wherein the light incident end of the light emitting submodule is opposite to the laser. Receiving light emitted by the laser, the light entering the optical fiber after passing through the light exiting end and the insert.
  • FIG. 1 is a schematic cross-sectional view of an optical transceiver assembly according to an embodiment of the present invention
  • FIG. 2 is an exploded perspective view of a light emitting sub-module provided by an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a light emitting sub-module mounted on a substrate according to another embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an insert of a light emitting sub-module provided by an embodiment of the present invention.
  • a Transmitter Optical Subassembly (TOSA) 300 is applied to an optical transceiver assembly.
  • the optical transceiver assembly includes a substrate 100, a laser 200 disposed on the substrate 100, and a The light-emitting sub-module 300, the light-input end 311 of the light-emitting sub-module 300 faces the laser 200 to receive the light emitted by the laser 200, and the light enters the optical fiber after passing through the light-emitting end 312 and the plug-in 330.
  • the laser 200 is a Vertical Cavity Surface Emitting Laser (VCSEL).
  • the light emitting sub-module 300 of the embodiment of the present invention includes a prism body 310, a first lens 320, and an insert 330.
  • the prism body 310 includes an optical end 311 and a light emitting end 312.
  • a lens 320 is disposed between the light exiting end 312 and the insert 330, the insert 330 includes a contact end 335, and the contact end 335 is located at a surface of the insert 330 away from the first lens 320.
  • the center of the contact end 335 is located at the focus of the optical path of the first lens 320, that is, the light emitted through the first lens 320 is collected at the contact end 335, and the contact end 335 is curved to be connected to the optical fiber 400 without gap. The end face reflection of the contact end 335 is reduced.
  • the contact end 335 of the optical fiber 400 and the optical fiber 400 are arranged in a curved shape, and the contact end 335 of the curved surface is in contact with the end surface of the optical fiber 400, so that the gapless connection can be realized, thereby the plug-in 330 and the optical fiber 400.
  • the present application does not require the use of an optical isolator to form a low feedback return loss of approximately -30 dB or less, which is advantageous for stable use of a single mode or a modeless laser.
  • the contact position can be line contact, line contact can achieve contactless contact.
  • the insert 330 includes a first end surface 331 , a second end surface 332 , and a circumferential surface 333 connected between the first end surface 331 and the second end surface 332 .
  • the second end surface 332 faces away from the first lens 320, the second end surface 332 has a curved shape as a whole, and the contact end 335 is formed at a central area of the second end surface 332.
  • the circumferential surface 333 is a cylindrical surface, or the circumferential surface 333 is an axisymmetric structure, and the central axis of the axisymmetric structure is located on the optical axis of the output light of the first lens 320.
  • the first end surface 331 is planar, and the first end surface 331 may be perpendicular to the optical axis of the first lens 320.
  • the second end surface 332 may also include a curved surface (ie, the contact end 335) and a pair of connecting surfaces 336 on both sides of the curved surface.
  • the pair of connecting surfaces 336 are respectively connected to the curved surface.
  • the contact end 335 is a curved surface between the pair of connecting surfaces 336.
  • a pair of connecting faces 336 may be symmetrically disposed on both sides of the curved surface, and the pair of connecting faces 336 may be flat or other irregular surfaces.
  • the present application does not limit the specific shape of the second end surface 332 as long as the contact end 335 of the central portion of the second end surface 332 is formed in a curved shape.
  • the prism body 310 includes an integrally formed conductive portion 316 and an assembly portion 317 .
  • the assembly portion 317 defines a receiving space 3171 therein.
  • the bottom of the receiving space 3171 is the prism body.
  • the light-emitting end 312 of the 310, the assembly portion 317 includes a first end 3172 connected to the conductive portion 316 and a second end 3174 away from the first end 3172, and the receiving space 3171 is in the second
  • An opening 3173 is formed at the end 3174 for inserting the insert 330 and the optical fiber 400 into the receiving space 3171, the circumferential surface 333 of the insert 330 and the side wall 3175 of the receiving space 3171 contact.
  • the assembly portion 317 may be in the shape of a hollow sleeve.
  • the outer periphery of the assembly portion 317 may also be provided with a protrusion, and the protrusion may be used to achieve a limit between the light-emitting sub-module 300 and the peripheral component, for example, the light-emitting sub-module 300 Fixed to the housing of the optical transceiver.
  • the shape of the accommodating space 3171 in the assembly portion 317 is matched with the optical fiber 400, the optical fiber 400 is inserted into the accommodating space 3171, and the optical fiber 400 is positioned by the contact of the outer surface of the optical fiber 400 with the side wall 3175 of the accommodating space 3171.
  • the insert 330 is also inserted into the accommodating space 3171, and the axial position of the insert 330 and the optical fiber 400 can be simultaneously determined by the side wall of the accommodating space 3171.
  • the receiving space 3171 has a cylindrical or axisymmetric structure, and the central axis of the receiving space 3171 is the optical axis of the light emitting end 312 of the prism main body 310.
  • a mounting slope 31731 is provided at the opening 3173 of the assembly portion 317, and the mounting slope 31713 forms an angle with the optical axis (the angle may be between 15 degrees and 45 degrees).
  • the arrangement of the mounting ramps 31713 facilitates the orientation of the mounting of the insert 330 and the fiber 400 process, resulting in a higher alignment efficiency of the assembly process.
  • the first lens 320 is integrally formed at the light exit end 312 of the prism body 310.
  • the integrated structure can achieve higher light transmission efficiency and effectively reduce return loss.
  • the first lens 320 can also be separated from the prism body 310.
  • the first lens 320 is mounted from the opening of the receiving space 3171 to the light exiting end 312, and is defined by a limiting structure disposed at the position of the light exiting end 312. The position of a lens 320.
  • the side wall 3175 of the receiving space 3171 includes a limiting step 3176, the limiting step 3176 faces the opening 3173, and the limiting step 3176 is used to abut the insert 330 The first end surface 331.
  • the embodiment defines the position of the insert 330 by the limiting step 3176.
  • the contact end 335 of the insert 330 can be positioned at the focus of the first lens 320 by abutting the limiting step 3176.
  • the first end face 331 of the insert 330 and the limit step 3176 can be fixed by optical glue bonding.
  • the conductive portion 316 includes a first surface 3161, a second surface 3162, and a reflective surface 3163.
  • the light incident end 311 is disposed on the first surface 3161, and the light exit end 312 is disposed on the One side of the second surface 3162, the light-emitting end 312 is disposed on one side of the second surface 3162, that is, the light-emitting end 312 may be disposed on the second surface 3162, or may be disposed on the other surface adjacent to the second surface 3162.
  • the assembly portion 317 is connected to the second surface 3162, and the reflective surface 3163 is for reflecting light incident from the light incident end 311 to the light exit end 312.
  • a reflective surface 3163 is disposed between the light incident end 311 and the light exit end 312 of the conductive portion 316, and the light incident from the light incident end 311 is reflected to the light exit end 312 through the reflective surface 3163, thereby facilitating the reduction of the conductive portion.
  • the planar size of 316 effectively utilizes the spatial size, so that the light-emitting sub-module 300 has a small size and a good space occupancy.
  • the extending direction of the first surface 3161 is perpendicular to the extending direction of the second surface 3162.
  • the vertical direction described herein also includes substantially perpendicular, and the angle between the first surface 3161 and the second surface 3162 may be in a suitable range of about 90 degrees, for example, a range between 80 degrees and 100 degrees is called basic. vertical.
  • the angle between the reflecting surface 3163 and the first surface 3161 is 45 degrees.
  • the first surface 3161 is provided with a second lens 340 integrally formed at the light incident end 311 of the prism body 310. It can be understood that the second lens 340 can also be a split structure with the prism body 310.
  • the prism body 310 further includes a support portion 318 connected to the first surface 3161 of the conductive portion 316 , the support portion 318 surrounding the The second lens 340 is used to support the conductive portion on the substrate 100.
  • the support portion 318 is connected to the substrate 100, and the support portion 318 forms a closed enclosed space together with the substrate 100 and the first surface 3161.
  • the support portion 318 and the substrate 100 may be fixed and sealed by an adhesive, and a waterproof structure may be provided to protect the light source device (ie, the laser 200) on the substrate 100.
  • a groove may be formed on the surface of the substrate 100, a waterproof glue is filled in the groove, and the alignment groove of the support portion 318 is adhered to the groove by the waterproof glue, and the support portion 318 is supported.
  • One end is embedded in the groove to form a waterproof structure.
  • the dielectric optical constant of the insert 330 is close to or the same as the dielectric optical constant of the optical fiber 400.
  • the insert 330 is made of glass, and the core of the optical fiber 400 is also made of glass.
  • the optical constants of the two media are close to each other, that is, the difference in optical constants of the medium is small, specifically, the insert.
  • the dielectric constant of the medium of 330 and the optical constant of the medium of the optical fiber 400 are required to satisfy the following conditions: the dielectric constant of the dielectric of the insert 330 is greater than the optical constant of the medium, and the difference between the optical constant of the dielectric of the insert 330 and the optical constant of the optical medium of the optical fiber 400 is smaller. it is good.
  • the dielectric constant of the medium of air is 1, the dielectric constant of the optical fiber is 1.5, and the optical constant of the dielectric of the insert 330 is greater than 1, and is close to 1.5, such as between 1.3 and 1.5.
  • the dielectric constant of the insert 330 is 1.5, it is the most desirable state.
  • the insert 330 is a ceramic ferrule.
  • the fiber optic 400 connector is an LC or SC connector.
  • the "SC” connector is a standard square connector. It is made of engineering plastic and has high temperature resistance and is not easy to oxidize.
  • the optical interface of the transmission device generally uses an SC connector.
  • the "LC” connector is similar in shape to the SC connector and is smaller than the SC connector.
  • the present application is applicable to MMF or SMF fiber, SMF fiber: Single Mode Fiber (SMF), that is, single mode fiber; MMF fiber: Multi-mode optical fiber, that is, multimode fiber.

Abstract

本发明实施例公开了光发射次模块，包括棱镜主体、第一透镜和插件，所述棱镜主体包括入光端和出光端，所述第一透镜设于所述出光端和所述插件之间，所述插件包括接触端，所述接触端位于所述插件之远离所述第一透镜的表面，所述接触端的中心位于所述第一透镜的光路焦点上，所述接触端呈弧面状，以与光纤无间隙对接，减少所述接触端的端面反射。本发明还公开一种光收发组件。本发明实施例提供的光发射次模块具有较小的光纤端面的反射和回损。

Description

光发射次模块及光收发组件
本申请要求于2017年11月29日提交中国专利局、申请号为201711247876.6，发明名称为“封装结构及电子装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及光纤通讯设备，特别涉及一种用于光纤通讯的光发射次模块(TOSA，Transmitter Optical Sub-Assembly)。
背景技术
由于视频流、大数据和云计算使用的增长引起了“数据雪崩”，从而产生对服务器的存储能力和数据传输能力的需求的提升。为了满足数据服务业务的爆炸性增长，企业网和数据中心的光电互联模块朝着更高速、更高密度的趋势发展。光收发组件成为光电互联模块不可少的成员，通过光发射次模块在VCSEL(Vertical Cavity Surface Emitting Laser，垂直腔面发射激光器)和光纤之间进行光路传输，为了以更快的数据速率实现可靠的数据信号传输，光通信链路中的信号衰减越小越好，如何实现减少光纤端面的反射和回损(return Loss)，从而减少光纤端面反射到VCSEL的光功率，保证VCSEL的工作稳定，为业界持续不断研究的方向。
发明内容
本发明实施例提供一种光发射次模块，光纤端面反射及回损小，信号衰减小。
第一方面，一种实施方式中，本发明实施例提供了一种光发射次模块，包括棱镜主体、第一透镜和插件，所述棱镜主体包括入光端和出光端，所述第一透镜设于所述出光端和所述插件之间，所述插件包括接触端，所述接触端位于所述插件之远离所述第一透镜的表面，所述接触端的中心位于所述第一透镜的光路焦点上，所述接触端呈弧面状，以与光纤无间隙对接，减少所述接触端的端面反射。
本发明实施例通过将插件与光纤的接触端设置为弧面状，弧面状的接触端与光纤端面之间接触，可以实现无间隙的对接，从而在插件与光纤之间的光传输路径上无任何空气介质，光从插件直接进入光纤，能够减少接触端的端面反射。
一种实施方式中，所述插件包括第一端面、第二端面和连接在所述第一端面和所述第二端面之间的周面，所述第一端面面对所述第一透镜，所述第二端面背离所述第一透镜，所述第二端面整体呈弧面状，所述接触端形成于所述第二端面的中心区域。
其它实施方式中，第二端面也可以包括弧面和位于弧面两侧的一对连接面，一对连接面分别连接在弧面的两端和周面之间，接触端即为一对连接面之间的弧面。具体而言，一对连接面可以对称设置在弧面的两侧，一对连接面可以为平面，也可以为其它不规则的表面。本申请不限定第二端面的具体的形状，只要第二端面的中心区域的接触端设置为弧面状。
一种实施方式中，所述棱镜主体包括一体成型的传导部和组装部，所述组装部内设收容空间，收容空间的底部为所述棱镜主体的所述出光端，所述组装部包括与所述传导部相连的第一端和远离所述第一端的第二端，所述收容空间在所述第二端处形成开口，所述开口用于供所述插件和所述光纤插入所述收容空间，所述插件的所述周面与所述收容空间的侧壁接触。
所述组装部可以呈中空套筒状，组装部的外周还可以设置突出物，突出物可以用于实现光发射次模块与周边元件之间的限位，例如将光发射次模块固定至光收发器的外壳上。组装部内的收容空间的形状尺寸与光纤相匹配，光纤插入收容空间中，通过光纤的外表面与收容空间侧壁的接触实现光纤的定位。而且，插件亦插入收容空间内，通过收容空间的侧壁可以同时将确定插件和光纤的轴向位置。一种实施方式中，收容空间呈圆柱状或轴对称的结构，收容空间的中心轴为棱镜主体出光端的光轴。
一种实施方式中，所述第一透镜一体成型于所述棱镜主体的所述出光端处，一体式的结构可以实现更高的光传导效率，有效减少回损。当然第一透镜也可以与棱镜主体为分体式结构，将第一透镜从收容空间的开口处安装至出光端处，并通过设置在出光端位置处的限位结构限定第一透镜的位置。
一种实施方式中，所述收容空间的所述侧壁包括限位台阶，所述限位台阶面向所述开口，所述限位台阶用于抵接所述插件的所述第一端面。本实施方式通过限位台阶限定插件的位置，使得插件插入收容空间后，通过抵靠限位台阶就可以实现插件的接触端位于第一透镜的焦点上。插件的第一端面与限位台阶之间可以通过光学胶粘合固定。
一种实施方式中，所述传导部包括第一表面、第二表面和反射面，所述入光端设于所述第一表面，所述出光端设于所述第二表面的一侧，出光面设于第二表面的一侧意思是说出光面可以设在第二表面上，也可以设置在靠近第二表面的其它面上，所述组装部连接至所述第二表面，所述反射面用于将从所述入光端入射的光线反射至所述出光端。本申请通过在传导部的入光端和出光端之间设置反射面，通过反射面来将入光端入射的光线反射至所述出光端，有利于减小传导部的平面尺寸，有效利用空间尺寸，使得光发射次模块具有小尺寸，空间占用率好的优势。
具体而言，所述第一表面的延伸方向垂直于所述第二表面的延伸方向。这里所述的垂直于亦包括基本垂直，第一表面和第二表面之间的夹角可以在90度左右的一个合适的范围，例如80度-100度之间的范围都称为基本垂直。
一种实施方式中，所述第一表面设有第二透镜，所述第二透镜一体成型于所述棱镜主体的所述入光端处。可以理解地，第二透镜也可以与棱镜主体之间为分体式结构。
一种实施方式中，所述棱镜主体还包括支撑部，所述支撑部连接至所述传导部的所述第一表面，所述支撑部包围所述第二透镜，并用于将所述传导部支撑在基板上。支撑部连接在基板上，支撑部与基板及第一表面共同形成封闭的包围空间。支撑部与基板之间可以通过粘胶的方式固定并密封，可以设置防水结构，以保护基板上的光源器件。具体而言，可以在基板的表面设凹槽，在凹槽内填充防水胶，再将支撑部的对准凹槽，通过防水胶将支撑部粘接在凹槽内，支撑部的一端嵌入凹槽中，形成防水结构。
一种实施方式中，所述插件的介质光学常数与所述光纤的介质光学常数接近或相同。 所述插件的介质光学常数与所述光纤的介质光学常数接近的范围满足：插件的介质光学常数大于空气的介质光学常数，且插件的介质光学常数与光纤的介质光学常数差距越小越好，当二者相同的时候为理想状态。
第二方面，本申请还提供一种光收发组件，包括基板、设于基板上的激光器，及所述的光发射次模块，所述光发射次模块的所述入光端正对所述激光器，以接收所述激光器发出的光线，所述光线经过所述出光端和所述插件后进入所述光纤。
附图说明
为了更清楚地说明本发明实施例或背景技术中的技术方案，下面将对本发明实施例或背景技术中所需要使用的附图进行说明。
图1是本发明一种实施方式提供的光收发组件的截面示意图；
图2是本发明一种实施方式提供的光发射次模块的分解示意图；
图3是本发明另一种实施方式提供的光发射次模块安装在基板上的示意图；
图4是本发明一种实施方式提供的光发射次模块的插件的示意图。
具体实施方式
下面结合本发明实施例中的附图对本发明实施例进行描述。
如图1所示，本发明实施例提供的光发射次模块300(Transmitter Optical Subassembly,TOSA)，应用在光收发组件中，光收发组件包括基板100、设于基板100上的激光器200，及所述的光发射次模块300，所述光发射次模块300的入光端311正对所述激光器200，以接收所述激光器200发出的光线，所述光线经过出光端312和插件330后进入光纤400。激光器200为垂直腔面发射激光器(Vertical Cavity Surface Emitting Laser,VCSEL)。
请参阅图1和图2，本发明实施例提供的光发射次模块300包括棱镜主体310、第一透镜320和插件330，所述棱镜主体310包括入光端311和出光端312，所述第一透镜320设于所述出光端312和所述插件330之间，所述插件330包括接触端335，所述接触端335位于所述插件330之远离所述第一透镜320的表面，所述接触端335的中心位于所述第一透镜320的光路焦点上，即经过第一透镜320射出的光线聚集在接触端335处，所述接触端335呈弧面状，以与光纤400无间隙对接，减少所述接触端335的端面反射。
本发明实施例通过将插件330与光纤400的接触端335设置为弧面状，弧面状的接触端335与光纤400端面之间接触，可以实现无间隙的对接，从而在插件330与光纤400之间的光传输路径上无任何空气介质，光从插件330直接进入光纤400，能够减少接触端335的端面反射。本申请不需要使用光学隔离器，即可形成接近或小于-30dB的低反馈回损，有利于单模或者少模激光器的稳定使用。相较一般的平面与平面的接触，由于平面会存在加工公差导致的平面度问题，两个相接触的平面之间难免有间隙，而本申请的接触端335呈弧面状，弧面与光纤400接触，其接触的位置可以为线接触，线接触即可实现无间隙的接触。
一种实施方式中，所述插件330包括第一端面331、第二端面332和连接在所述第一端面331和所述第二端面332之间的周面333，所述第一端面331面对所述第一透镜320， 所述第二端面332背离所述第一透镜320，所述第二端面332整体呈弧面状，所述接触端335形成于所述第二端面332的中心区域。具体而言，周面333为圆柱面，或者周面333为轴对称结构，轴对称结构的中心轴位于第一透镜320输出光线的光轴上。第一端面331呈平面状，且第一端面331可以垂直于第一透镜320的光轴。
其它实施方式中，请参阅图4，第二端面332也可以包括弧面(即接触端335)和位于弧面两侧的一对连接面336，一对连接面336分别连接在弧面的两端和周面333之间，接触端335即为一对连接面336之间的弧面。具体而言，一对连接面336可以对称设置在弧面的两侧，一对连接面336可以为平面，也可以为其它不规则的表面。本申请不限定第二端面332的具体的形状，只要第二端面332的中心区域的接触端335设置为弧面状。
一种实施方式中，如图2所示，所述棱镜主体310包括一体成型的传导部316和组装部317，所述组装部317内设收容空间3171，收容空间3171的底部为所述棱镜主体310的所述出光端312，所述组装部317包括与所述传导部316相连的第一端3172和远离所述第一端3172的第二端3174，所述收容空间3171在所述第二端3174处形成开口3173，所述开口3173用于供所述插件330和所述光纤400插入所述收容空间3171，所述插件330的所述周面333与所述收容空间3171的侧壁3175接触。
所述组装部317可以呈中空套筒状，组装部317的外周还可以设置突出物，突出物可以用于实现光发射次模块300与周边元件之间的限位，例如将光发射次模块300固定至光收发器的外壳上。组装部317内的收容空间3171的形状尺寸与光纤400相匹配，光纤400插入收容空间3171中，通过光纤400的外表面与收容空间3171侧壁3175的接触实现光纤400的定位。而且，插件330亦插入收容空间3171内，通过收容空间3171的侧壁可以同时将确定插件330和光纤400的轴向位置。一种实施方式中，收容空间3171呈圆柱状或轴对称的结构，收容空间3171的中心轴为棱镜主体310出光端312的光轴。
请参阅图3，组装部317的开口3173处设有安装斜面31731，所述安装斜面31731与光轴之间形成夹角(夹角可以为15度-45度之间)。安装斜面31713的设置有利于安装插件330和光纤400过程的导向，使得组装过程具有更高的对位效率。
一种实施方式中，所述第一透镜320一体成型于所述棱镜主体310的所述出光端312处，一体式的结构可以实现更高的光传导效率，有效减少回损。当然第一透镜320也可以与棱镜主体310为分体式结构，将第一透镜320从收容空间3171的开口处安装至出光端312处，并通过设置在出光端312位置处的限位结构限定第一透镜320的位置。
一种实施方式中，所述收容空间3171的所述侧壁3175包括限位台阶3176，所述限位台阶3176面向所述开口3173，所述限位台阶3176用于抵接所述插件330的所述第一端面331。本实施方式通过限位台阶3176限定插件330的位置，使得插件330插入收容空间3171后，通过抵靠限位台阶3176就可以实现插件330的接触端335位于第一透镜320的焦点上。插件330的第一端面331与限位台阶3176之间可以通过光学胶粘合固定。
一种实施方式中，所述传导部316包括第一表面3161、第二表面3162和反射面3163，所述入光端311设于所述第一表面3161，所述出光端312设于所述第二表面3162的一侧，出光端312设于第二表面3162的一侧意思是说出光端312可以设在第二表面3162上，也可以设置在靠近第二表面3162的其它面上，所述组装部317连接至所述第二表面3162， 所述反射面3163用于将从所述入光端311入射的光线反射至所述出光端312。本申请通过在传导部316的入光端311和出光端312之间设置反射面3163，通过反射面3163来将入光端311入射的光线反射至所述出光端312，有利于减小传导部316的平面尺寸，有效利用空间尺寸，使得光发射次模块300具有小尺寸，空间占用率好的优势。
具体而言，所述第一表面3161的延伸方向垂直于所述第二表面3162的延伸方向。这里所述的垂直于亦包括基本垂直，第一表面3161和第二表面3162之间的夹角可以在90度左右的一个合适的范围，例如80度-100度之间的范围都称为基本垂直。反射面3163与第一表面3161之间的夹角为45度。
一种实施方式中，所述第一表面3161设有第二透镜340，所述第二透镜340一体成型于所述棱镜主体310的所述入光端311处。可以理解地，第二透镜340也可以与棱镜主体310之间为分体式结构。
请参阅图3，一种实施方式中，所述棱镜主体310还包括支撑部318，所述支撑部318连接至所述传导部316的所述第一表面3161，所述支撑部318包围所述第二透镜340，并用于将所述传导部支撑在基板100上。支撑部318连接在基板100上，支撑部318与基板100及第一表面3161共同形成封闭的包围空间。支撑部318与基板100之间可以通过粘胶的方式固定并密封，可以设置防水结构，以保护基板100上的光源器件(即激光器200)。具体而言，可以在基板100的表面设凹槽，在凹槽内填充防水胶，再将支撑部318的对准凹槽，通过防水胶将支撑部318粘接在凹槽内，支撑部318的一端嵌入凹槽中，形成防水结构。
所述插件330的介质光学常数与所述光纤400的介质光学常数接近或相同。一种实施方式中，插件330为玻璃材质，光纤400的芯部亦为玻璃材质，二者的介质光学常数接近的意思是说，它们的介质光学常数差异较小，具体而言，所述插件330的介质光学常数与所述光纤400的介质光学常数需要满足如下条件：插件330的介质光学常数大于空气的介质光学常数，且插件330的介质光学常数与光纤400的介质光学常数差距越小越好。举例而言，空气的介质光学常数为1，光纤的介质光学常数为1.5，插件330的介质光学常数大于1，且接近1.5，例如1.3-1.5之间。当插件330的介质光学常数为1.5时，为最理想的状态。
一种实施方式中，插件330为陶瓷插芯(ferrule)。光纤400接头为LC或SC接头，“SC”接头是标准方型接头，采用工程塑料，具有耐高温，不容易氧化优点。传输设备侧光接口一般用SC接头。“LC”接头与SC接头形状相似，较SC接头小一些。本申请适用于MMF或者SMF光纤，SMF光纤：SingleMode Fiber(SMF)即单模光纤；MMF光纤：Multi-mode optical fiber，即多模光纤。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (11)

  1. 一种光发射次模块，其特征在于，包括棱镜主体、第一透镜和插件，所述棱镜主体包括入光端和出光端，所述第一透镜设于所述出光端和所述插件之间，所述插件包括接触端，所述接触端位于所述插件之远离所述第一透镜的表面，所述接触端的中心位于所述第一透镜的光路焦点上，所述接触端呈弧面状，以与光纤无间隙对接。
  2. 如权利要求1所述的光发射次模块，其特征在于，所述插件包括第一端面、第二端面和连接在所述第一端面和所述第二端面之间的周面，所述第一端面面对所述第一透镜，所述第二端面背离所述第一透镜，所述第二端面整体呈弧面状，所述接触端形成于所述第二端面的中心区域。
  3. 如权利要求2所述的光发射次模块，其特征在于，所述棱镜主体包括一体成型的传导部和组装部，所述组装部内设收容空间，所述收容空间的底部为所述棱镜主体的所述出光端，所述组装部包括与所述传导部相连的第一端和远离所述第一端的第二端，所述收容空间在所述第二端处形成开口，所述开口用于供所述插件和所述光纤插入所述收容空间，所述插件的所述周面与所述收容空间的侧壁接触。
  4. 如权利要求3所述的光发射次模块，其特征在于，所述第一透镜一体成型于所述棱镜主体的所述出光端处。
  5. 如权利要求3所述的光发射次模块，其特征在于，所述收容空间的所述侧壁包括限位台阶，所述限位台阶面向所述开口，所述限位台阶用于抵接所述插件的所述第一端面。
  6. 如权利要求3所述的光发射次模块，其特征在于，所述传导部包括第一表面、第二表面和反射面，所述入光端设于所述第一表面，所述出光端设于所述第二表面的一侧，所述组装部连接至所述第二表面，所述反射面用于将从所述入光端入射的光线反射至所述出光端。
  7. 如权利要求6所述的光发射次模块，其特征在于，所述第一表面的延伸方向垂直于所述第二表面的延伸方向。
  8. 如权利要求6所述的光发射次模块，其特征在于，所述第一表面设有第二透镜，所述第二透镜一体成型于所述棱镜主体的所述入光端处。
  9. 如权利要求8所述的光发射次模块，其特征在于，所述棱镜主体还包括支撑部，所述支撑部连接至所述传导部的所述第一表面，所述支撑部包围所述第二透镜，并用于将所述传导部支撑在基板上。
  10. 如权利要求1-9任意一项所述的光发射次模块，其特征在于，所述插件的介质光学常数与所述光纤的介质光学常数接近或相同。
  11. 一种光收发组件，其特征在于，包括基板、设于基板上的激光器、及如权利要求1-10任意一项所述的光发射次模块，所述光发射次模块的所述入光端正对所述激光器，以接收所述激光器发出的光线，所述光线经过所述出光端和所述插件后进入所述光纤。
PCT/CN2018/096864 2017-11-29 2018-07-24 光发射次模块及光收发组件 WO2019105048A1 (zh)

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EP3705922A4 (en) 2020-12-30

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