CN102520490A - Large-mode-area single-mode fiber connector and manufacture method - Google Patents

Large-mode-area single-mode fiber connector and manufacture method Download PDF

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CN102520490A
CN102520490A CN2012100115716A CN201210011571A CN102520490A CN 102520490 A CN102520490 A CN 102520490A CN 2012100115716 A CN2012100115716 A CN 2012100115716A CN 201210011571 A CN201210011571 A CN 201210011571A CN 102520490 A CN102520490 A CN 102520490A
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optical fiber
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refractive index
mode fiber
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李恩邦
唐春晓
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Tianjin Polytechnic University
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Abstract

本发明公开了一种大模面积的单模光纤连接器及制造方法。该连接器包括插针,插针外周是连接固定头,插针中心孔是单模光纤,单模光纤熔接由阶跃型多模光纤经热扩散制得的折射率渐变透镜,在单模光纤的橡胶尾套上制有色环。该连接器的制造过程:将阶跃型多模光纤进行纤芯掺杂元素的热扩散,形成沿径向向外减小的折射率渐变透镜,再与单模光纤熔接、及切断并固接在插针中心孔内,外端与插针的端面平齐,并对插针端面研磨抛光;在橡胶尾套印制色环,插针配置连接固定头。本发明的优点在于,结构简单易于制造,其端面易保证清洁,通光面积大,与现有的其它光纤活动连接器能实现相配连接。

Figure 201210011571

The invention discloses a single-mode optical fiber connector with a large mode area and a manufacturing method. The connector includes a ferrule, the periphery of the ferrule is a connection fixing head, the center hole of the ferrule is a single-mode fiber, and the single-mode fiber is fused with a graded index lens made by step-type multimode fiber through thermal diffusion. Color rings are formed on the rubber boot. The manufacturing process of the connector: the step-type multi-mode fiber is thermally diffused by the core doping element to form a graded lens with a reduced refractive index radially outward, and then welded, cut and fixed with the single-mode fiber In the center hole of the pin, the outer end is flush with the end face of the pin, and the end face of the pin is ground and polished; a color ring is printed on the rubber boot, and the pin is equipped with a fixed head. The invention has the advantages that the structure is simple and easy to manufacture, the end face is easy to keep clean, the light-passing area is large, and it can realize mating connection with other existing optical fiber movable connectors.

Figure 201210011571

Description

大模面积的单模光纤连接器及制造方法Single-mode optical fiber connector with large mode area and manufacturing method

技术领域 technical field

本发明涉及一种大模面积的单模光纤连接器及制造方法,属光纤技术及光纤通信技术领域。The invention relates to a large-mode area single-mode optical fiber connector and a manufacturing method thereof, which belong to the field of optical fiber technology and optical fiber communication technology.

背景技术 Background technique

在光纤的实际使用中经常需要将两段光纤相互对接,其实现方式有两类:熔接和采用活动连接器。采用熔接方式实现光纤对接具有对接插入损耗低、可靠性强的优点,可一旦将光纤熔接在一起,就是永久性的(除非再将其截断),所以其灵活性很差。光纤活动连接器是实现光纤与光纤之间进行可拆卸连接的元器件,通过它可以把光纤的两个端面精密对接起来,以使发射光纤输出的光能量最大限度地耦合到接收光纤中去。在光纤活动连接器中,光纤预先被固定在连接器中,使用中可随时插拔,十分便捷。尽管与熔接方式相比,光纤活动连接器会引入附加插入损耗,但光纤活动连接器仍然在光纤通信和其它光纤应用领域得到十分广泛的应用。光纤活动连接器是光纤系统中使用量最大的光无源器件,广泛应用于通信、局域网(LAN)、光纤到户(FTTH)、高质量视频传输、光纤传感和测试仪器仪表中。随着光纤技术的不断发展,各种不同类型的光纤活动连接器相继出现。据不完全统计,目前已有的光纤活动连接器的种类已达几十种,其中最为常用的有FC、SC、LC和MT-RJ等类型的连接器。采用这些光纤活动连接器可以实现同一种光纤的对接,而对不同类型光纤的对接则会引入很大的插入损耗。此外,现有光纤活动连接器的通光孔径即为光纤纤芯直径,对于单模光纤,其纤芯直径一般很小。例如普通1550nm单模光纤的纤芯直径约为10微米。如在活动连接器端面有微尘,则容易将通光孔径遮挡,而无法通光。所以必须保证光纤活动连接器端面的清洁,如有灰尘则需使用专用的工具擦试。再有,现有光纤活动连接器用于传输高功率的光信号时,经常会出现因活动连接器端面的功率密度过高而使其端面损坏的现象。为解决上述问题,一种方法是在单模光纤前端粘接一个折射率渐变(GRIN)透镜,以将由单模光纤出射的光束扩展并准直。该方法的效果是显而易见的,但在制作上须将折射率渐变透镜与光纤进行精确对准再进行粘接,难以与现有的光纤活动连接器的制作工艺相结合。另外一种方法是采用机械加工或是热熔方法在单模光纤前端加工出球状的微透镜。虽然该方法实现了单模光纤与扩束透镜的一体化,但却无法实现对接光纤端面的物理接触,即无法消除菲涅尔反射,难以控制回波损耗,因此也没有得到广泛应用。在单模光纤前端熔接一段折射率渐变的多模光纤是另外一种实现使单模光纤模场扩展的方法,但由于多模光纤包层的存在,使扩束效果受到限制。所以,目前仍然需要一种能够采用现有工艺制作大模面积的单模光纤连接器的制造方法,同时也需要有一种标识方法以将大模面积的单模光纤连接器与普通的光纤活动连接器加以区分。In the actual use of optical fibers, it is often necessary to connect two sections of optical fibers to each other. There are two types of implementation methods: fusion splicing and active connectors. The fusion splicing method to achieve optical fiber docking has the advantages of low insertion loss and high reliability, but once the optical fibers are fused together, it is permanent (unless it is cut off), so its flexibility is very poor. The optical fiber active connector is a component that realizes the detachable connection between the optical fiber and the optical fiber. Through it, the two end faces of the optical fiber can be precisely connected, so that the optical energy output by the transmitting optical fiber can be coupled to the receiving optical fiber to the maximum extent. In the optical fiber movable connector, the optical fiber is pre-fixed in the connector, and can be plugged and unplugged at any time during use, which is very convenient. Although fiber optic active connectors introduce additional insertion loss compared with fusion splices, optical fiber active connectors are still widely used in optical fiber communications and other optical fiber applications. Optical fiber active connectors are the most widely used optical passive components in optical fiber systems, and are widely used in communications, local area network (LAN), fiber-to-the-home (FTTH), high-quality video transmission, optical fiber sensing and test instruments. With the continuous development of optical fiber technology, various types of optical fiber active connectors have appeared one after another. According to incomplete statistics, there are currently dozens of types of optical fiber active connectors, among which FC, SC, LC and MT-RJ are the most commonly used connectors. The use of these optical fiber active connectors can realize the butt joint of the same type of optical fiber, but the butt joint of different types of optical fibers will introduce a large insertion loss. In addition, the optical aperture of existing optical fiber active connectors is the fiber core diameter, and for single-mode fibers, the core diameter is generally very small. For example, the core diameter of a common 1550nm single-mode fiber is about 10 microns. If there is dust on the end face of the movable connector, it is easy to block the light aperture and make it impossible to pass light. Therefore, it is necessary to ensure that the end face of the optical fiber active connector is clean, and if there is dust, it must be wiped with a special tool. Furthermore, when the existing optical fiber active connector is used to transmit high-power optical signals, the end face of the active connector is often damaged due to the high power density of the end face. In order to solve the above problems, one method is to bond a graded index of refraction (GRIN) lens to the front end of the single-mode fiber to expand and collimate the beam emitted from the single-mode fiber. The effect of this method is obvious, but the graded index lens must be precisely aligned with the optical fiber before bonding, and it is difficult to combine with the existing manufacturing process of the optical fiber active connector. Another method is to process a spherical microlens at the front end of the single-mode optical fiber by mechanical processing or thermal fusion. Although this method realizes the integration of the single-mode fiber and the beam expander lens, it cannot realize the physical contact of the end face of the docked fiber, that is, it cannot eliminate the Fresnel reflection, and it is difficult to control the return loss, so it has not been widely used. Splicing a section of multimode fiber with a graded index of refraction at the front end of the single-mode fiber is another way to expand the mode field of the single-mode fiber, but the beam expansion effect is limited due to the existence of the cladding of the multimode fiber. Therefore, there is still a need for a method of manufacturing single-mode optical fiber connectors with large-mode areas using existing processes, and a marking method is also required to flexibly connect large-mode-area single-mode optical fiber connectors with ordinary optical fibers. device to distinguish.

发明内容 Contents of the invention

本发明的目的在于提供一种大模面积的单模光纤连接器及制造方法。该大模面积的单模光纤连接器,不但端面易保证清洁,通光不易受外界环境影响,而且与现有的其它光纤活动连接器能实现相配连接,其制造方法简单。The purpose of the present invention is to provide a single-mode optical fiber connector with a large mode area and a manufacturing method. The single-mode optical fiber connector with large-mode area not only can easily keep the end face clean, and the light transmission is not easily affected by the external environment, but also can be mated and connected with other existing optical fiber active connectors, and the manufacturing method is simple.

本发明是通过以下技术方案加以实现的,一种大模面积的单模光纤连接器,它包括金属的或陶瓷的插针,在插针的周向配置连接固定头,在插针中心阶梯孔内由粘结剂固接单模光纤,插针之外的单模光纤上嵌套橡胶尾套,其特征在于,插针内的单模光纤熔接直径与该单模光纤包层直径相同的折射率渐变透镜,折射率渐变透镜的外端与插针的垂直端面或斜端面平齐,在单模光纤连接器的橡胶尾套上制有色环。The present invention is achieved through the following technical proposals. A single-mode optical fiber connector with a large mode area includes a metal or ceramic ferrule, and a connection fixing head is arranged in the circumferential direction of the ferrule. The single-mode optical fiber is fixed by the adhesive inside, and the rubber boot is nested on the single-mode optical fiber outside the ferrule. The outer end of the refractive index gradient lens is flush with the vertical end face or inclined end face of the ferrule, and a color ring is made on the rubber boot of the single-mode fiber optic connector.

上述的大模面积的单模光纤连接器的制造方法,其特征在于包括以下过程:The manufacturing method of the above-mentioned single-mode optical fiber connector with large mode area is characterized in that it includes the following process:

1)将直径与单模光纤包层直径相同的阶跃型多模光纤在温度1100℃~1150℃下进行纤芯掺杂元素的热扩散,形成沿着中心轴线径向向外减小折射率渐变透镜;1) A step-type multimode fiber with the same diameter as the cladding diameter of the single-mode fiber is thermally diffused at a temperature of 1100°C to 1150°C to form a radially outwardly reduced refractive index along the central axis. gradient lens;

2)使用光纤熔接机将单模光纤与步骤1)制得的折射率渐变透镜熔接在一起;2) using an optical fiber fusion splicer to fuse the single-mode optical fiber and the graded index lens prepared in step 1);

3)依据由单模光纤出射的光经折射率渐变透镜后,要求达到光束直径在折射率渐变透镜端面达到最大、并与折射率渐变透镜的直径相同、同时与其中心轴线平行的条件,将折射率渐变透镜在预定长度处切断;3) According to the condition that the light emitted from the single-mode optical fiber passes through the graded-index lens, the diameter of the beam reaches the maximum at the end face of the graded-index lens, is the same as the diameter of the graded-index lens, and is parallel to its central axis. The rate gradient lens is cut off at a predetermined length;

4)将单模光纤与折射率渐变透镜组合件用粘接剂固定在金属或陶瓷插针内的中心阶梯孔内,折射率渐变透镜的端面与插针的端面平齐,并对插针端面进行研磨抛光处理,在插针周向配置螺纹固定头,在单模光纤上嵌套橡胶尾套加印色环,制成大模面积单模光纤连接器。4) Fix the single-mode optical fiber and the graded index lens assembly in the central stepped hole in the metal or ceramic ferrule with an adhesive, the end face of the graded index lens is flush with the end face of the ferrule, and is aligned with the end face of the ferrule Carry out grinding and polishing treatment, configure threaded fixing head in the circumferential direction of the pin, nest rubber boots on the single-mode optical fiber and print color rings, and make a large-mode area single-mode optical fiber connector.

与现有技术相比本发明的优点在于,本发明提供的单模光纤连接器的制造方法具有如下显著优点:1)光束可充满折射率渐变透镜的所有通光面积,扩束效果好;2)可以实现不同种类的单模光纤的对接,且插入损耗低;3)结构简单,可靠性强,能与现有的光纤连接器的制造工艺很好的结合,并且制造成本低,适合批量生产;4)可以实现光纤端面的物理接触对接,特别是在端面研磨出斜角的情况下,具有回波损耗大的优点;5)外观标识易于识别;6)适合推广应用。Compared with the prior art, the advantage of the present invention is that the manufacturing method of the single-mode optical fiber connector provided by the present invention has the following significant advantages: 1) The light beam can fill all the light-passing areas of the gradient index lens, and the beam expansion effect is good; 2 ) can realize the docking of different types of single-mode optical fibers, and the insertion loss is low; 3) the structure is simple, the reliability is strong, and it can be well combined with the existing manufacturing process of optical fiber connectors, and the manufacturing cost is low, suitable for mass production ; 4) It can realize the physical contact butt joint of the end face of the optical fiber, especially when the end face is ground into an oblique angle, it has the advantage of large return loss; 5) The appearance mark is easy to identify; 6) It is suitable for popularization and application.

附图说明Description of drawings

附图1为本发明所涉及的光纤连接器的结构示意图。图1中,101为插针;102为金属螺帽;103为标识色环;104为橡胶尾套;105为光缆,其内部包含单模光纤。Accompanying drawing 1 is the structural diagram of the optical fiber connector involved in the present invention. In Fig. 1, 101 is a pin; 102 is a metal nut; 103 is an identification color ring; 104 is a rubber boot; 105 is an optical cable, which contains a single-mode optical fiber.

附图2为附图1中的陶瓷插针内部结构示意图。其中,201为陶瓷插针;202为单模光纤;203为单模光纤与陶瓷插针孔之间的间隙,其中填充有粘接剂;204为单模光纤与折射率渐变透镜的熔接面;205为折射率渐变透镜。Accompanying drawing 2 is a schematic diagram of the internal structure of the ceramic ferrule in accompanying drawing 1. Among them, 201 is a ceramic ferrule; 202 is a single-mode optical fiber; 203 is the gap between the single-mode optical fiber and the ceramic pin hole, which is filled with adhesive; 204 is the fusion surface of the single-mode optical fiber and the gradient index lens; 205 is a graded refractive index lens.

附图3为采用两只由本发明方法制作的光纤连接器进行单模光纤对接的示意图。其中,301、306为单模光纤;302、305为熔接面;303、304为折射率渐变透镜。图中的虚线表示光束在折射率渐变透镜中的直径变化。Accompanying drawing 3 is the schematic diagram of using two optical fiber connectors made by the method of the present invention to carry out single-mode optical fiber docking. Among them, 301 and 306 are single-mode optical fibers; 302 and 305 are fusion splicing surfaces; 303 and 304 are graded refractive index lenses. The dotted line in the figure represents the diameter change of the beam in the graded index lens.

具体实施方式 Detailed ways

下面结合附图对本发明的具体实施方式作详细说明。如附图2所示,单模光纤202采用标准单模通信光纤(G652),其纤芯直径为8.2μm,包层直径为125μm,数值孔径0.14。首先将其保护涂层除去,然后使用光纤切刀将其端面切成与其轴线垂直。折射率渐变透镜205使用Nufern MM-S105/125-15A折射率阶跃型多模光纤经高温处理制得。MM-S105/125-15A的纤芯直径为105μm,包层直径为125μm,数值孔径0.14。首先将其保护涂层除去,置于高温管式加热炉中,在1100℃温度下加热30分钟。在高温状态下,MM-S105/125-15A的纤芯中锗元素将由光纤中心线沿半径方向向外扩散,形成折射率由中心轴线沿径向向外减小折射率渐变透镜。The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. As shown in Figure 2, the single-mode optical fiber 202 is a standard single-mode communication optical fiber (G652), with a core diameter of 8.2 μm, a cladding diameter of 125 μm, and a numerical aperture of 0.14. First remove its protective coating, and then use a fiber optic cutter to cut its end face perpendicular to its axis. The graded index lens 205 is made by using Nufern MM-S105/125-15A step-index multimode fiber through high-temperature treatment. MM-S105/125-15A has a core diameter of 105 μm, a cladding diameter of 125 μm, and a numerical aperture of 0.14. First remove its protective coating, place it in a high-temperature tubular heating furnace, and heat it at 1100°C for 30 minutes. In the high temperature state, the germanium element in the fiber core of MM-S105/125-15A will diffuse outward from the centerline of the fiber along the radial direction, forming a graded lens whose refractive index decreases radially outward from the central axis.

使用光纤切刀将折射率渐变透镜205端面切成与其轴线垂直。之后,将端面处理后的单模光纤202和折射率渐变透镜205放入光纤熔接机将两光纤熔接在一起。在折射率渐变透镜205上距熔接面(204)400微米处使用光纤切刀将其切断,在其端面形成一个与其轴线垂直的镜面。陶瓷插针201采用2.500mm常规氧化锆陶瓷插针,其中心孔内径为126微米。在陶瓷插针201的中心孔内用注射器注入ND353环氧胶,再将上述单模光纤202与折射率渐变透镜205插入陶瓷插针201的中心孔内,折射率渐变透镜205的端面与陶瓷插针201的端面平齐。使用紫外灯进行固化处理,则在单模光纤202和折射率渐变透镜205与陶瓷插针201的间隙203内形成粘接层。Use a fiber cutter to cut the end face of the graded index lens 205 perpendicular to its axis. Afterwards, the single-mode optical fiber 202 and the graded index lens 205 after the end face treatment are put into the optical fiber fusion splicer to fuse the two optical fibers together. Cut the graded index lens 205 at a distance of 400 microns from the fusion surface (204) with a fiber cutter to form a mirror surface perpendicular to its axis on the end surface. The ceramic pin 201 adopts a 2.500mm conventional zirconia ceramic pin, and the inner diameter of the central hole is 126 microns. Inject ND353 epoxy glue into the center hole of the ceramic ferrule 201, and then insert the above-mentioned single-mode optical fiber 202 and refractive index gradient lens 205 into the center hole of the ceramic ferrule 201, and the end face of the refractive index gradient lens 205 and the ceramic ferrule The end faces of the needles 201 are flush. Using an ultraviolet lamp to perform curing treatment, an adhesive layer is formed in the gap 203 between the single-mode optical fiber 202 and the graded index lens 205 and the ceramic ferrule 201 .

本实施例中使用市售的标准FC型光纤连接器组件,其各种指标符合《中华人民共和国通信行业标准YD/T 1272.4-2007》规定的FC型光纤连接器的指标。In this embodiment, a commercially available standard FC-type optical fiber connector assembly is used, and its various indicators conform to the indicators of the FC-type optical fiber connector specified in the "Communication Industry Standard of the People's Republic of China YD/T 1272.4-2007".

将含有单模光纤202与折射率渐变透镜205的陶瓷插针与FC型光纤连接器组件组装成FC型光纤连接器。使用光纤研磨机进行研磨抛光处理;端面与陶瓷插针201的中心轴线垂直,则得到与标准FC/PC相对应的光纤连接器。根据本发明提供的大模面积单模光纤连接器的标识方法,将其记为FC/PC/L,或FC/PC-L;若将陶瓷插针端面研磨8°角,则得到与标准FC/APC相对应的光纤连接器。根据本发明提供的大模面积单模光纤连接器的标识方法,将其记为FC/APC/L,或FC/APC-L。The ceramic ferrule and the FC type optical fiber connector assembly including the single-mode optical fiber 202 and the graded index lens 205 are assembled into an FC type optical fiber connector. Use an optical fiber grinder to perform grinding and polishing; the end face is perpendicular to the central axis of the ceramic ferrule 201, and then an optical fiber connector corresponding to the standard FC/PC is obtained. According to the marking method of the large-mode-area single-mode optical fiber connector provided by the present invention, it is recorded as FC/PC/L, or FC/PC-L; /APC corresponding fiber optic connector. According to the marking method of the large-mode-area single-mode optical fiber connector provided by the present invention, it is recorded as FC/APC/L, or FC/APC-L.

对于FC/PC型光纤连接器,习惯上使用黑色橡胶尾套;而对于FC/APC型光纤连接器,习惯上使用绿色橡胶尾套。根据本发明提供的大模面积单模光纤连接器的标识方法,在黑色或绿色橡胶尾套104上加一个红色色环103,以表示与普通FC/PC或FC/APC型光纤连接器的区别。采用上述标识方法,色彩对比鲜明,使用者可以很容易地将本发明涉及的大模面积单模光纤连接器与标准FC型光纤连接器加以区别。For FC/PC fiber optic connectors, it is customary to use black rubber boots; for FC/APC fiber optic connectors, it is customary to use green rubber boots. According to the marking method of the large-mode-area single-mode optical fiber connector provided by the present invention, a red color ring 103 is added to the black or green rubber boot 104 to indicate the difference from ordinary FC/PC or FC/APC optical fiber connectors . With the above marking method, the color contrast is sharp, and users can easily distinguish the large-mode-area single-mode optical fiber connector involved in the present invention from the standard FC optical fiber connector.

对于其它已有类型光纤连接器,可以采用与本实施例给出的类似方法应用本发明提供的大模面积单模光纤连接器的制造和标识方法。For other existing types of optical fiber connectors, the method for manufacturing and marking the large-mode-area single-mode optical fiber connector provided by the present invention can be applied in a method similar to that given in this embodiment.

本领域的专业技术人员都清楚,本发明的思想可采用上面列举的具体实施方式以外的其它方式实现。It is clear to those skilled in the art that the idea of the present invention can be implemented in other ways than the specific implementations listed above.

Claims (2)

1. the long-pending single-mode optical fiber connector of a big die face; It comprises contact pin metal or pottery, connects fixed head in the circumferential configuration of contact pin, in the contact pin central stepped by the affixed single-mode fiber of cementing agent; Nested rubber tail cover on the single-mode fiber outside the contact pin; It is characterized in that, the single-mode fiber welding diameter multimode stepped-index optical fiber identical in the contact pin with this single-mode fiber cladding diameter, this multimode stepped-index optical fiber is and outwards reduces the gradually changed refractive index lens; The outer end that outwards reduces the gradually changed refractive index lens is concordant with the perpendicular end surface or the angled end-face of contact pin, puts at the rubber tail of single-mode fiber and is shaped on colour circle.
2. manufacturing approach by the long-pending single-mode optical fiber connector of the described big die face of claim 1 is characterized in that comprising following process:
1) multimode stepped-index optical fiber that diameter is identical with the single-mode fiber cladding diameter carries out the thermal diffusion of fibre core doped chemical under 1100 ℃~1150 ℃ of temperature, forms and radially outward reduces the gradually changed refractive index lens along central axis;
2) use optical fiber splicer that the gradually changed refractive index lens that single-mode fiber and step 1) make are welded together;
3) according to by the light of single-mode fiber outgoing after outwards reducing the gradually changed refractive index lens; Requirement reach beam diameter the gradually changed refractive index lensed endface reach maximum and identical with the diameter of gradually changed refractive index lens, simultaneously with the condition of its central shaft line parallel, the gradually changed refractive index lens are cut off at the predetermined length place;
4) with single-mode fiber and gradually changed refractive index lens assembly with in the central stepped of adhesive securement in metal or ceramic contact pin; The end face of gradually changed refractive index lens is concordant with the end face of contact pin; And the contact pin end face is carried out grinding and polishing handle; Circumferentially dispose the screw thread fixed head at contact pin, nested rubber tail overprint colour circle on single-mode fiber is processed the long-pending single-mode optical fiber connector of big die face.
CN2012100115716A 2012-01-16 2012-01-16 Large-mode-area single-mode fiber connector and manufacture method Pending CN102520490A (en)

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CN103246011A (en) * 2013-05-17 2013-08-14 珠海瑞光科技有限公司 Beam expanding fiber and manufacturing method thereof
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CN104297859A (en) * 2013-12-05 2015-01-21 中航光电科技股份有限公司 Single-mode fiber contact and manufacture method thereof
CN109425934A (en) * 2017-09-01 2019-03-05 中航光电科技股份有限公司 Ray machine coaxial collimator and optical fiber connector
CN110707514A (en) * 2019-09-18 2020-01-17 珠海市杰威光电科技有限公司 Module capable of replacing beam expanding optical fiber and preparation method thereof
CN111624703A (en) * 2020-05-10 2020-09-04 桂林电子科技大学 Fiber integrated Fourier transform micro optical system
CN111650690A (en) * 2020-05-10 2020-09-11 桂林电子科技大学 A micro-collimator based on double-clad fiber
CN111624703B (en) * 2020-05-10 2022-05-31 桂林电子科技大学 Fiber integrated Fourier transform micro optical system
CN114911009A (en) * 2022-04-28 2022-08-16 上海拜安传感技术有限公司 Optical fiber filter

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Application publication date: 20120627