WO2017197652A1

WO2017197652A1 - Slot type limit structure for single-fiber bidirectional optical module and filter

Info

Publication number: WO2017197652A1
Application number: PCT/CN2016/082907
Authority: WO
Inventors: 曹伯承; 李远谋; 董英华
Original assignee: 华为技术有限公司
Priority date: 2016-05-20
Filing date: 2016-05-20
Publication date: 2017-11-23

Abstract

A slot-type limit structure for a single-fiber bi-directional optical module and filter. The module comprises a silicon-based optical platform; along a laser transmission direction, a laser for emitting laser light, a lens, a filter and an optical fiber sequentially arranged on a laser transmission path, the filter being a filter which allows the emitted laser to go through and which reflects the laser light returned by means of the optical fiber; also a photodetector for receiving the laser light reflected by the filter, wherein the silicon-based optical platform is etched and formed with a limit structure for fixing the foregoing elements; further, a package structure for coordinating with the silicon-based optical platform, and for packaging the foregoing elements. In the above embodiment, by means of employing the silicon-based optical platform as a platform for supporting the elements, certain structures of the fixed elements are directly formed on the silicon-based optical platform. When compared with the single-fiber bi-directional optical modules in the prior art, the present invention does not require the use of an additional fixation structure, which simplifies the installation structure of the single-fiber bi-directional optical module, and facilitates the installation of the single-fiber bi-directional optical module.

Description

Slot type limit structure of single-fiber bidirectional optical component and filter

Technical field

The present invention relates to the field of communications technologies, and in particular, to a bi-directional optical sub-assembly (BOSA) and a slot-type limiting structure of the filter.

Background technique

Traditional Bi-directional Optical Sub-assembly (BOSA) is generally composed of 24 discrete components. As shown in FIG. 1 and FIG. 2, the conventional single-fiber bidirectional optical component adopts a discrete structure and a metal casing. Light having a wavelength of λ1 = =1310 nm is emitted from the laser 20, transmits the transflective sheet 30 to the optical fiber 40, and light having a wavelength of λ2 = =110 nm is reflected on the transflective sheet 30 through the optical fiber 40 to the photodetector. 50 on. In this way, the single-fiber bidirectional optical component realizes the function of receiving the illumination signal.

In assembling the above-mentioned single-fiber bidirectional optical component, the assembly process of the laser, the transflective, the optical fiber and the photodetector includes a patch, a wire, a cap, a resistance welding, a structural component assembly, a laser welding, and a pigtail. Installation and other multi-process components. The large number of external structural members, resulting in a relatively complicated assembly process, so the cost can never be reduced. Laser welding in key processes is also very easy to introduce reliability issues due to process fluctuations.

Summary of the invention

The invention provides a slot type limiting structure of a single-fiber bidirectional optical component and a filter, which is used to simplify the positioning structure of the single-fiber bidirectional optical component and improve the installation efficiency of the single-fiber bidirectional optical component.

The invention provides a single-fiber bidirectional optical component, which comprises: a silicon-based optical platform, a laser for emitting laser light, a lens, a filter and an optical fiber which are sequentially disposed on the laser propagation path along the propagation direction of the laser The filter is a filter that allows the emitted laser light to transmit and can reflect the laser light returned in the optical fiber, and further includes a photodetector for receiving the laser light reflected by the filter;

Etching the silicon-based optical platform to fix the laser, the lens, the filter, Photodetector, fiber optic limit structure;

Also included is a package structure that mates with the silicon-based optical platform and encapsulates the laser, lens, filter, fiber, and photodetector.

In the above embodiment, by using a silicon-based optical platform as a platform for the supporting member, the structure of some of the fixing members is directly formed on the silicon-based optical platform, and no additional fixing is required as compared with the single-fiber bidirectional optical assembly of the prior art. The structure simplifies the installation structure of the single-fiber bidirectional optical component, and facilitates the installation of the single-fiber bidirectional optical component.

In a specific embodiment, the limiting structure includes: a first sinking structure for fixing the laser; a first slot structure for passive mounting of the lens; and a second passive mounting for the filter Slot structure; second sinking structure for passive placement of photodetectors; third slot structure for passive mounting of optical fibers. The first sinking structure is used to fix the laser, and the lens is fixed by the first slot structure, the filter is fixed by the second slot structure, the photodetector is fixed by the second sinking structure, and the optical fiber is fixed by the third slot structure. The sinking structure and the slot structure are formed on the silicon-based optical platform by etching, and the laser, the lens, the filter, the photodetector and the optical fiber can be fixed without additional components, thereby reducing the above components. The connector required for fixing simplifies the installation structure of the entire single-fiber bidirectional optical component, and in the above assembly process, the component is passively fixed when fixed, that is, the laser transmitter is not required to transmit laser to determine the position of each component, and the position is improved. The installation efficiency of the single-fiber bidirectional optical component.

In a more specific embodiment, the limiting structure further includes a first position identification point that defines the laser in cooperation with the first sinking structure. It is more convenient to determine the placement position of the laser by setting the first position identification point, thereby improving the installation precision of the laser. Similarly, the limiting structure further includes a second position identifying point that defines the photodetector in cooperation with the second sinking structure. The positioning accuracy of the photodetector is improved by the arrangement of the second position recognition point and the second sinking structure.

In order to improve the stability of the optical fiber after installation, the third slot structure is preferably a V-shaped groove or a U-shaped groove structure. The V-shaped or U-shaped groove can stably fix the optical fiber.

When the package structure is combined with a silicon-based optical platform, the package structure can be used in different ways. Fixed, in a specific manner, the package structure is a top cover that covers the silicon-based optical platform and is fixedly coupled to the silicon-based optical platform. In another specific form, the package structure is a glue layer covering the laser, the lens, the filter, the photodetector, and the optical fiber.

In addition, an electromagnetic shielding frame enclosing the optical substrate of the silicon substrate is also included. The structure of the single-fiber bidirectional optical component is protected by the electromagnetic shielding frame provided, and the stability of the single-fiber bidirectional optical component in use is improved.

The present invention also provides a slot type limiting structure of a filter, the slot type limiting structure of the filter comprising the single-fiber bidirectional optical component according to any one of the above, wherein the single-fiber bidirectional optical component adopts silicon-based optical The platform is used as a platform for supporting components, and the structure of some fixed components is directly formed on the silicon-based optical platform, which simplifies the efficiency of the slot-type limiting structure of the filter during installation, and improves the slot-type limiting structure of the filter. Installation efficiency.

DRAWINGS

1 is a schematic structural view of a single-fiber bidirectional optical component in the prior art;

2 is a schematic diagram of the operation of a single-fiber bidirectional optical component in the prior art;

3 is a schematic structural diagram of an optical part of a single-fiber bidirectional optical component assembled according to an embodiment of the present invention;

4 is a schematic structural diagram of an assembled silicon-based optical platform according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a single-fiber bidirectional optical component according to an embodiment of the present invention.

Reference mark:

20-laser 30-transflective splitter 40-fiber

50-photodetector 1-first sinking structure 11-first position identification point

2-first slot structure 3-second slot structure 4-second sink structure

41-Second position recognition point 5-third slot structure 6-top cover

7-Optical Silicon Based Platform 8-Transimpedance Amplifier Chip 9-PCB (Printed Circuit Board) 10-Electromagnetic Shielding Frame

detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiments of the present invention provide a single-fiber bidirectional optical component, which includes: a silicon-based optical platform, a laser for emitting laser light, a lens, a filter, and an optical fiber sequentially disposed on a laser propagation path along a laser propagation direction. The filter is a filter that allows the emitted laser to pass through and can reflect the laser returned in the optical fiber, and further includes a photodetector for receiving the laser reflected by the filter;

A silicon-based optical platform is formed with a limiting structure for fixing a laser, a lens, a filter, a photodetector, and an optical fiber;

Also included is a package that mates with a silicon-based optical platform and encapsulates lasers, lenses, filters, fibers, and photodetectors.

In order to facilitate the understanding of the structure and principle of the single-fiber bidirectional optical component provided by this embodiment, a detailed description will be given below in conjunction with specific embodiments and drawings.

As shown in FIG. 3 and FIG. 4, the present embodiment provides a single-fiber bidirectional optical component using a simple-processed silicon substrate as a silicon optical bench (SiOB), optical components (laser, lens, filter, fiber, and photodetection). Assembly and assembly on the platform, eliminating the need for traditional BOSA optical adapters, spherical optical packages, ceramic ferrules and many other structural components to aid assembly and coupling, with a small number of materials (less than 10). The process is simple, avoiding the problems of PLC (Planar Lightwave Circuit) and BOSA process complexity and low yield. This will be described in detail below with reference to the drawings.

As shown in FIG. 3, FIG. 3 is a schematic structural view of a silicon-based optical platform provided by the embodiment. On the silicon-based optical platform, some limiting structures are formed by etching to fix optical components such as lasers, lenses, filters, optical fibers, and photodetectors, thereby facilitating the installation of the above components. When the above-mentioned limiting structure is specifically set, a limiting structure is formed on the silicon-based optical platform by a dry method or a wet etching method. Dry or wet etching is a conventional technical means in the prior art, and will not be described in detail herein.

In a specific setting, the limiting structure comprises: a first sinking structure 1 for fixing the laser; a first slot mechanism 2 for passive mounting of the lens; and a second slot for passive mounting of the filter Positioning mechanism 3; second sinking structure 4 for passive placement of photodetectors; third slot structure 5 for passive mounting of optical fibers. In the above-mentioned limiting structure etching, it is necessary to ensure that the mounted laser, lens, filter and optical fiber are on the same optical path. In order to achieve the above purpose, each of the limit structure is verified by simulation during the above structural drawing design. The position of the structure, thereby ensuring that the optical center of the lens defined by the first slot mechanism 2, the position of the filter defined by the second slot mechanism 3, and the position of the optical fiber defined by the third slot structure 5 are located at the laser light emitted by the laser On the optical path, the laser can be propagated into the optical fiber. Similarly, the position of the photodetector defined by the second sinking structure 4 is located on the optical path of the received light reflected by the filter, thereby ensuring that the received light can be received by the photodetector. . Through the limitation of the position of the first sinking structure 1, the second sinking structure 4, the first slot mechanism 2, the second slot mechanism 3, and the third slot structure 5 at the time of etching, each optical device is ensured The accuracy of the installation, as can be seen from the above description, in the present embodiment, in the above-mentioned limiting structure, the first sinking structure 1 is used to fix the laser, and the lens is fixed by the first slot mechanism 2, The two slots mechanism 3 fixes the filter, fixes the photodetector through the second sinking structure 4, and fixes the optical fiber through the third slot structure 5, and the sinking structure and the slot structure are formed by etching on the silicon-based optical platform. The fixing of the laser, the lens, the filter, the photodetector and the optical fiber can be realized without additional components, the connector required for fixing the above components is reduced, and the installation structure of the entire single-fiber bidirectional optical component is simplified. Moreover, in the above assembly process, the components are passively fixed when fixed, that is, the laser transmitter is not required to transmit laser light to determine the position of each component, and the installation efficiency of the single-fiber bidirectional optical component is improved.

With continued reference to FIG. 3, in this embodiment, as shown in FIG. 3, the second slot mechanism of the fixed filter is fixed. 3 is a trapezoidal groove, that is, a groove with a narrow opening at the bottom, and the groove is a groove provided obliquely upward, which ensures that the installed filter is in an inclined direction, so that laser light emitted by the laser emitter can be passed, and the fiber is passed. The reflected light reflected back can be reflected.

In addition, in order to improve the stabilizing effect of the optical fiber after installation, it is preferable that the third slot structure 5 is a V-shaped groove or a U-shaped groove structure. That is, the cross section of the third slot structure 5 is V-shaped or U-shaped, so that the optical fiber can be stably fixed, and the stability of the optical fiber after installation and the accuracy of the installation position are ensured.

In order to further improve the accuracy in installation, in a more specific embodiment, the limiting structure further includes a first position identifying point 11 that cooperates with the first sinking structure 1 to define the laser. The position of the laser in the first sinking structure 1 is determined by the first position of the set point identification point 11 and the positioning structure on the laser, thereby improving the mounting accuracy of the laser. Similarly, the limiting structure further includes a second position identifying point 41 that cooperates with the second sinking structure 4 to define the photodetector. When the photodetector is installed, the positioning position on the photodetector is facilitated by the second position identification point 41 and the positioning structure on the photodetector, which improves the alignment accuracy of the photodetector.

After the optical component is fixed on a silicon-based optical stage, the above components need to be packaged. In a specific package, different structures can be used for packaging. As shown in FIG. 4, in a specific embodiment, the package structure is a top cover 6 that covers the silicon-based optical platform and is fixedly coupled to the silicon-based optical platform. Specifically, the optical cover is covered by the top cover 6, the optical path is protected, and the single-fiber bidirectional optical component structure is completed. After the mounting is completed, the optical cover (optical component) is covered with a top cover 6 made of plastic, metal or silicon material, and glue is used. Or the solder bonding top cover 6 is packaged to protect the optical optical path to complete the airtight/non-hermetic sealing structure of the chip. Or in another specific manner, the package structure is a glue layer covering the laser, the lens, the filter, the photodetector, and the optical fiber. The glue is directly sprayed onto the above optical component, and the above optical component is covered by glue to realize packaging.

As shown in FIG. 5, after the installation of the optical portion is completed, the structure of the optical portion is completed to be connected to the PCB 9 (printed circuit substrate) and the TIA. Specifically, after the optical portion is completed, the silicon-based optical platform is mounted on the PCB. On the 9th, the transimpedance amplifier chip 8 is mounted, and the silicon-based optical platform and the transimpedance amplifier chip 8 are connected at the same time, the silicon-based optical platform and the PCB 9, and the transimpedance amplifier chip 8 and the PCB are connected. 9. In actual operation, the signal is transmitted from the PCB 9 to the optical component of the silicon-based optical platform, and the signal received by the silicon-based optical platform is transmitted to the transimpedance amplifier chip 8, which is amplified and then transmitted to the PCB 9.

In order to improve the signal propagation effect of the single-fiber bidirectional optical component, the single-fiber bidirectional optical component provided in this embodiment further includes an electromagnetic shielding frame 10 enclosing a silicon substrate optical platform. The structure of the single-fiber bidirectional optical component is protected by the electromagnetic shielding frame 10 provided, and the stability of the single-fiber bidirectional optical component in use is improved. In a specific connection, the electromagnetic shielding frame 10 encloses a transimpedance amplifier chip 8, a silicon-based optical platform, and components on the PCB 9 that are connected to the silicon-based optical platform and the transimpedance amplifier chip 8. In a specific setting, the electromagnetic shielding frame 10 is a metal frame and has a good electromagnetic shielding effect.

The embodiment of the invention further provides a slot type limiting structure of the filter, wherein the slot type limiting structure of the filter comprises the single-fiber bidirectional optical component of any one of the above, and the single-fiber bidirectional optical component adopts silicon-based optical The platform is used as a platform for supporting components, and the structure of some fixed components is directly formed on the silicon-based optical platform, which simplifies the efficiency of the slot-type limiting structure of the filter during installation, and improves the slot-type limiting structure of the filter. Installation efficiency.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A single-fiber bidirectional optical component, comprising: a silicon-based optical platform, a laser for emitting laser light, a lens, a filter, and an optical fiber sequentially disposed on the laser propagation path along a laser propagation direction; The filter is a filter that allows the emitted laser to transmit and can reflect the laser returned in the optical fiber, and further includes a photodetector for receiving the laser reflected by the filter;

Forming a limiting structure for fixing the laser, the lens, the filter, the photodetector, and the optical fiber on the silicon-based optical platform;

Also included is a package structure that mates with the silicon-based optical platform and encapsulates the laser, lens, filter, fiber, and photodetector.
The single-fiber bidirectional optical module according to claim 1, wherein the limiting structure comprises: a first sinking structure for fixing the laser; a first slot structure for passive mounting of the lens; The second slot structure for passive mounting of the filter; the second sinking structure for passive placement of the photodetector; and the third slot structure for passive mounting of the optical fiber.
The single-fiber bidirectional optical module of claim 2, wherein the limiting structure further comprises a first position identification point that defines the laser in cooperation with the first sinking structure.
The single-fiber bidirectional optical assembly of claim 3 wherein said constraining structure further comprises a second position identification point defining said photodetector in cooperation with said second sinking structure.
The single-fiber bidirectional optical module according to claim 2, wherein the third slot structure is a V-shaped groove or a U-shaped groove structure.
The single-fiber bidirectional optical module of claim 1 wherein said package structure is a top cover overlying said silicon-based optical platform and fixedly coupled to said silicon-based optical platform.
The single-fiber bidirectional optical module according to claim 1, wherein the package structure is a glue layer covering the laser, the lens, the filter, the photodetector, and the optical fiber.
The single-fiber bidirectional optical module according to any one of claims 1 to 7, further comprising an electromagnetic shielding frame enclosing the optical substrate of the silicon substrate.
A slot-type limiting structure for a filter, comprising the single-wire bidirectional optical assembly according to any one of claims 1-8.