WO2018014220A1

WO2018014220A1 - Bidirectional bosa assembly, optical module and pon system

Info

Publication number: WO2018014220A1
Application number: PCT/CN2016/090509
Authority: WO
Inventors: 李书; 徐之光; 余力强; 李远谋
Original assignee: 华为技术有限公司
Priority date: 2016-07-19
Filing date: 2016-07-19
Publication date: 2018-01-25

Abstract

A bidirectional BOSA assembly, an optical module and a PON system. The bidirectional BOSA assembly comprises a base, an optical sending assembly, an optical receiving assembly, an optical fibre assembly and a WDM filter, wherein the optical sending assembly uses a first interface module to receive an electrical signal sent by a first peripheral circuit and uses an LD to convert the electrical signal received by the first interface module into an optical signal; the optical receiving assembly uses a PD to convert an optical signal in an optical network into an electrical signal, amplifies same by means of a TIA, and then sends same to a second peripheral circuit via a second interface module; the optical fibre assembly comprises a glass sleeve and an optical fibre, the optical fibre is arranged in the glass sleeve, a first end of the optical fibre is attached to an end face of the glass sleeve, and a second end of the optical fibre is connected to the optical network; and the WDM filter is arranged in the optical fibre assembly and is used for separating the optical signal transmitted by means of the LD in the optical fibre from the optical signal transmitted by means of the optical network in the optical fibre. The implementation of the embodiments of the present invention can reduce the costs of a BOSA.

Description

Two-way BOSA component and optical module, PON system

Technical field

The present invention relates to the field of optical fiber communication technologies, and in particular, to a bidirectional BOSA component, an optical module, and a PON system.

Background technique

With the development of the communications field and the advent of the era of big data, the demand for network throughput has also increased. With its ultra-high bandwidth and low electromagnetic interference, optical transmission has gradually become the mainstream technology of modern communication. At present, the optical communication network mainly exists in the form of a PON (Passive Optical Network). The PON system is mainly composed of an OLT (Optical Line Terminal), an Optical Distribution Network (ODN), and an ONU. (Optical Network Unit, optical network unit), wherein the OLT and the ONU include optical modules, which are responsible for photoelectric conversion and transmission of network signals, and are the basis for normal communication of the entire network. In addition, the PON system uses a one-to-many tree topology. For an OLT device, there can be as many as dozens or more ONUs connected below. With the large-scale deployment of PON networks, the required ONU equipment has grown in a million-level number, so the demand for cost reduction on the ONU side is increasingly strong, and optical modules are the main source of cost, and important components in optical modules. It is a BOSA (Bi-directional Optical Sub-Assembly) that carries the transmission and reception of optical signals. Therefore, how to reduce the cost of the ONU device by reducing the cost of the BOSA component is an urgent problem to be solved in the industry.

Summary of the invention

The embodiment of the invention discloses a bidirectional BOSA component, an optical module and a PON system for reducing the cost of the BOSA component.

A first aspect of the embodiments of the present invention discloses a bidirectional BOSA component, including: a base, and a light transmitting component, a light receiving component, a fiber component, and a wavelength division multiplexing WDM filter disposed on the base, wherein The optical transmitting component includes a laser diode LD and a first interface module, the LD is connected to the first interface module, and the first interface module is configured to receive the first peripheral circuit to send Electrical signal, the LD is used to convert an electrical signal received by the first interface module into an optical signal; the light receiving component comprises a photodiode PD, a transimpedance amplifier TIA and a second interface module, the PD and the a TIA connection, the TIA is connected to the second interface module, the PD is configured to convert an optical signal in an optical network (such as a light distribution network ODN) into an electrical signal, and the TIA is used to convert the PD into The electrical signal is amplified, the second interface module is configured to send the amplified electrical signal to the second peripheral circuit; the optical fiber assembly includes a glass sleeve and an optical fiber, and the optical fiber is disposed in the glass sleeve, the optical fiber a first end of the glass sleeve is attached to the end surface of the glass sleeve, a second end of the optical fiber is coupled to the optical network, and a WDM filter is disposed in the optical fiber assembly for the LD to be The optical signal transmitted in the optical fiber is separated from the optical signal transmitted by the optical network in the optical fiber. The first peripheral circuit and the second peripheral circuit may be the same circuit or different circuits. The goal of reducing the cost of BOSA is achieved by simplifying the composition of the BOSA components.

With reference to the first aspect of the embodiments of the present invention, in a first possible implementation manner of the first aspect of the embodiments, a recessed area is defined under the glass sleeve, and the light receiving component is disposed in the recess within the area.

With reference to the first possible implementation manner of the first aspect of the embodiment of the present invention, in a second possible implementation manner of the first aspect of the embodiment, the device has a size and the WDM filter An adapted truncation port for placing the WDM filter, the truncation port extending radially through the optical fiber. Optical path definition is achieved using a fiber optic assembly with a glass sleeve with grooves and truncating the fiber and a WDM filter.

With reference to the first aspect of the embodiment of the present invention or the first or second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect of the embodiment of the present invention, the optical signal emitted by the LD Transmission in the optical fiber is transmitted to the optical network via the WDM filter, and optical signals transmitted by the optical network are transmitted in the optical fiber and reflected to the PD via the WDM filter. The optical signals of different wavelengths are separated by a WDM filter.

With reference to the first aspect of the first embodiment of the present invention or the first to third possible embodiments of the first aspect, in the fourth possible implementation manner of the first aspect of the embodiment of the present invention, the light The sending component further includes a backlight detector MPD connected to the LD for monitoring an operating state of the LD.

In conjunction with the fourth possible implementation manner of the first aspect of the embodiment of the present invention, in the embodiment of the present invention In a fifth possible implementation manner, the two-way BOSA component further includes: a carrying module disposed on the base for carrying the MPD. Wherein, the carrying module is composed of an insulating material.

With reference to the first aspect of the first embodiment of the present invention or the first to fifth possible embodiments of the first aspect, in the sixth possible implementation manner of the first aspect of the embodiments of the present invention, the two-way The BOSA assembly further includes: an isolation module disposed on the base and connected to the LD and the first interface module respectively for shielding electromagnetic radiation between the optical transmitting component and the light receiving component; The LD is disposed on the isolation module. The isolation module is made of metal and can be part of the base, that is, integrally formed with the base, or can be an additional module independent of the base, and the electromagnetic shielding can be shielded by the isolation module to reduce the influence of electrical crosstalk.

With reference to the first aspect of the embodiment of the present invention or any one of the first to sixth aspects of the first aspect, in the seventh possible implementation manner of the first aspect of the embodiment, the LD It is highly consistent with the first end of the optical fiber. In this way, the optical signal emitted by the LD can be maximized from the first end of the optical fiber into the optical fiber for transmission, thereby improving the coupling degree between the LD and the optical fiber.

With reference to the first aspect of the first embodiment of the present invention, or any one of the first to seventh aspects of the first aspect, in the eighth possible implementation manner of the first aspect of the embodiment of the present invention, the An interface module includes at least two first pins, and the second interface includes at least four second pins; wherein the first interface module receives the first periphery through the at least two first pins An electrical signal transmitted by the circuit, the second interface module transmitting the TIA amplified electrical signal to the second peripheral circuit through the at least four second pins. In addition, the pins are separated from the base by glass glue to electrically isolate the two.

With reference to the first aspect of the first embodiment of the present invention or the first to seventh possible embodiments of the first aspect, in a ninth possible implementation manner of the first aspect of the embodiments of the present invention, the An interface module is a first pad, the second interface module is a second pad, and a plurality of wires are disposed on the first pad and the second pad; wherein the first pad The block receives an electrical signal sent by the first peripheral circuit through a trace, and the second pad sends the TIA amplified electrical signal to the second peripheral circuit through a trace. The first block and the second block are both insulating material blocks, such as ceramic blocks, fiberglass blocks, resin blocks, etc., and may be plated on the upper surfaces of the first block and the second block, respectively. A layer of metal conductors and a number of traces on the metal conductor.

With reference to the first aspect of the embodiment of the present invention or any one of the first to the ninth aspects of the first aspect, in the tenth possible implementation manner of the first aspect of the embodiment of the present invention, The end surface of the glass sleeve to which the first end of the optical fiber is attached is an inclined surface of a predetermined angle, and the predetermined angle is an angle between the inclined surface and the vertical direction.

With reference to the tenth possible implementation manner of the first aspect of the embodiment of the present invention, in the eleventh possible implementation manner of the first aspect of the embodiment, the preset angle is 6 degrees to 8 degrees.

With reference to the first aspect of the first embodiment of the present invention or the first to eleventh possible embodiments of the first aspect, in the twelfth possible implementation manner of the first aspect of the embodiment of the present invention, The fiber is a tapered fiber, and the first end is a cone. By tapering the optical fiber close to one end of the LD, the core diameter is reduced, so that the coupling matching degree between the tapered optical fiber and the LD is improved, thereby improving the light output power of the BOSA.

With reference to the first aspect of the embodiment of the present invention or any one of the first to eleventh aspects of the first aspect, in the thirteenth possible implementation manner of the first aspect of the embodiment of the present invention, The fiber is a lens fiber, and the first end is a lens. By processing the fiber near the end of the LD into a lens, the coupling efficiency between the LD and the fiber can be improved.

With reference to the first aspect of the first embodiment of the present invention or the first to the thirteenth possible embodiments of the first aspect, in the fourteenth possible implementation manner of the first aspect of the embodiment of the present invention, The bidirectional BOSA assembly is encapsulated by means of a sealing and sealing metal shield. The cost of packaging can be reduced by replacing the conventional hermetic package with a package that is sealed with a metal protective cover.

A second aspect of the embodiments of the present invention discloses an optical module, including the bidirectional BOSA component disclosed in the first aspect of the embodiments of the present invention.

The third aspect of the embodiment of the present invention discloses a passive optical network PON system, including: an optical line terminal OLT, at least one optical network unit ONU, and an optical distribution network ODN connecting the OLT and the at least one ONU, where The optical module disclosed in the second aspect of the embodiment of the present invention is included in the OLT and the at least one ONU.

In the embodiment of the present invention, the optical transmitting component placed on the base in the bidirectional BOSA component receives the electrical signal sent by the first peripheral circuit by using the first interface module, and converts the electrical signal received by the first interface module into a laser diode LD. Optical signal; the light receiving component placed on the base utilizes a photodiode The PD converts the optical signal in the optical network into an electrical signal, and is amplified by the TIA and sent to the second peripheral circuit via the second interface module; the optical fiber component placed on the base is coupled to the LD and the PD through the optical fiber, respectively, and passes through The WDM filter transmits the optical signal transmitted by the LD in the optical fiber to the optical network, and reflects the optical signal transmitted by the optical network in the optical fiber to the PD to separate the optical signals of the two different wavelengths transmitted and received. In the embodiment of the present invention, the implementation of the direct coupling of the laser LD and the optical fiber eliminates the lens structure and reduces the structural cost compared with the conventional BOSA; and the optical fiber component and the WDM filter are used to define the optical path, and the waveguide is combined with the waveguide. Integration and free-space optics to achieve BOSA structure, which can improve the BOSA emission rate.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying for creative labor.

1 is a schematic structural diagram of a bidirectional BOSA assembly according to an embodiment of the present invention;

2 is a schematic structural view of a fiber optic assembly disclosed in an embodiment of the present invention;

FIG. 3a is a schematic structural diagram of another bidirectional BOSA assembly according to an embodiment of the present invention; FIG.

Figure 3b is a top plan view of the two-way BOSA assembly shown in Figure 3a;

4a is a schematic structural diagram of another bidirectional BOSA assembly according to an embodiment of the present invention;

Figure 4b is a top plan view of the two-way BOSA assembly shown in Figure 4a;

FIG. 5 is a schematic structural diagram of another bidirectional BOSA assembly according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of another bidirectional BOSA component according to an embodiment of the present invention;

7 is a schematic structural diagram of another bidirectional BOSA component according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of still another bidirectional BOSA component according to an embodiment of the present invention; FIG.

9 is a schematic structural diagram of an optical module according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a PON system according to an embodiment of the present invention.

detailed description

The technical solution in the embodiment of the present invention will be clarified in the following with reference to the accompanying drawings in the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the invention discloses a bidirectional BOSA component, an optical module and a PON system, which are used to solve the problem of how to reduce the cost of the BOSA. The details are described below separately.

For a better understanding of the embodiments of the present invention, a PON network architecture disclosed in the embodiments of the present invention is described below. In the PON network architecture, an optical line terminal OLT, a plurality of optical network units ONU, and a light distribution network ODN connecting the OLT and the ONU may be included. The OLT is generally installed in the central control station and is mainly used for transmitting signals downwards; the ONU is generally installed in a user's place; the ODN is generally composed of passive components such as optical fibers, optical splitters or couplers. An OLT can contain two or more optical modules, each optical module corresponding to one ODN and serving a certain number of users (one ONU represents one user, such as ONU1, ONU2, ..., ONUx represents x users, where x For a positive integer greater than or equal to 2, each ONU also contains an optical module. The optical modules in the OLT and ONU devices have the same structure and functions, and are responsible for the photoelectric conversion and transmission of network signals, which is the basis for the normal communication of the entire network. In the embodiment of the present invention, the PON network may include a Gigabit-Capable Passive Optical Network (GPON), an EPON (Ethernet Passive Optical Network), a 10G GPON, a 10G EPON, and the like. The embodiment of the invention is not limited. At present, the PON network adopts a one-to-many tree branch structure, generally adopting a distribution structure of 1:32 or 1:64 or even more, that is, for an OLT device, the ONU device connected thereto is the 32 of the OLT internal optical module. Or 64 times. With the large-scale application of FTTH (Fiber-to-the-Home), the number of ONUs on the user side is huge, and the ONU side has a demand environment for cost reduction. The cost of the ONU depends mainly on the optical module. Therefore, the optical module needs to be reduced. The cost is to achieve the goal of reducing the cost of ONU equipment.

An important component of the optical module is the bidirectional optical component BOSA, which further reduces the cost of the optical module by reducing the cost of the BOSA. BOSA is used to transmit and receive optical signals. The general BOSA is mainly composed of a TOSA (Transmitting Optical Sub-Assembly), a Resivating Optical Sub-Assembly (ROSA), and a WDM (Wavelength Division Multiplexing) filter. Among them, the role of TOSA is to convert electrical signals into optical signals by LD (Laser Diode) and input them into the optical network for transmission. The role of ROSA is to receive optical signals and convert them into electrical signals through PD (Photo Diode). In general, the wavelengths of the transmitted optical signal and the received optical signal are different, and the signals of the two types of wavelengths can be separated by the WDM filter. At present, a single TOSA and ROSA are generally packaged in the form of TO-CAN (Transistor-Outline Can), and both are assembled by a metal base with a pin and a cap with a lens. The device in the TO package form is packaged in a gas-tight process during the formation process, that is, the TO cap is soldered to the TO base in a pure nitrogen atmosphere, and then the sealing test is required, resulting in a package. The cost is large. Based on the above problems, an embodiment of the present invention provides a new BOSA component, which mainly includes a base and a series of component components disposed thereon, and specifically includes a special fiber component, a light transmitting component, a light receiving component, and a WDM filter. In addition, the implementation of the direct coupling of the laser and the optical fiber eliminates the lens structure and reduces the structural cost of the BOSA compared with the conventional BOSA. In addition, the package is sealed with a metal protective cover instead of the conventional hermetic package. Can reduce packaging costs.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a bidirectional BOSA assembly according to an embodiment of the present invention. As shown in FIG. 1, the bidirectional BOSA component can include at least: a base 100, an optical transmitting component 200, a light receiving component 300, a fiber optic component 400, and a wavelength division multiplexing WDM filter 500, wherein:

The optical transmitting component 200 can include at least a laser diode LD210 (ie, a laser) and a first interface module 220, wherein the LD 210 is connected to the first interface module 220, and the first interface module 220 is configured to receive an electrical signal sent by the first peripheral circuit, the LD210 For converting an electrical signal received by the first interface module 220 into an optical signal;

The light receiving component 300 can include at least a photodiode PD310, a transimpedance amplifier TIA320, and a second interface module 330. The PD 310 is connected to the TIA 320, and the TIA 320 is connected to the second interface module 330. The PD 310 is configured to convert the optical signal in the optical network into The electrical signal, the TIA 320 is used to amplify the electrical signal converted by the PD 310, and the second interface module 330 is configured to send the amplified electrical signal to the second peripheral circuit;

The fiber optic assembly 400 can include at least a glass sleeve 410 and an optical fiber 420. The optical fiber 420 is disposed in the glass sleeve 410. The first end a of the optical fiber 420 is attached to the end surface of the glass sleeve 410, and the second end b of the optical fiber 420 is Optical network connection;

WDM filter 500 is placed within fiber optic assembly 400 for transmitting LD 210 light in fiber 420 The signal is separated from the optical signal transmitted by the optical network in the optical fiber 420.

In the embodiment of the present invention, the base 100 of the bidirectional BOSA assembly may be a metal base for carrying components such as the optical transmitting component 200, the light receiving component 300, and the optical fiber component 400. The LD 210 in the optical transmitting component 200 is connected to the first interface module 220, and the two can be connected by a connecting line such as a gold wire or an aluminum wire; the first interface module 220 can include a peripheral interface for receiving an external circuit (first The peripheral circuit transmits the electrical signal, and the first interface module 220 transmits the electrical signal to the LD 210 to enable the LD 210 to perform electro-optical conversion, that is, convert the electrical signal into an optical signal. The PD 310 in the light receiving component 300 is connected to the TIA 320, and the TIA 320 is connected to the second interface module 330, and the connection line can be a gold wire or an aluminum wire; and the PD 310 can perform photoelectric conversion, that is, from an optical network (such as a light distribution network). The optical signal of ODN) is converted into an electrical signal. Since the optical signal received by the PD 310 is relatively weak, the converted electrical signal is small and needs to be amplified and processed. Therefore, the electrical signal converted by the PD 310 needs to be output to the TIA320 connected thereto for amplification, and then connected to the TIA320. The second interface module 330 is sent out, and the second interface module 330 may also include a peripheral interface for outputting the amplified electrical signal of the TIA 320 to other external circuits (second peripheral circuits). The first peripheral circuit and the second peripheral circuit may be the same peripheral circuit, or may be different peripheral circuits, which are not limited in the embodiment of the present invention. The glass sleeve 410 in the fiber optic assembly 400 can be solid. The fiber 420 can be transversely penetrated into the glass sleeve 410. The optical path 420 can be used to limit the direction of the signal light path within the assembly. The first end a can be associated with one of the glass sleeves 410. The end faces are fitted, and the second end b can penetrate the other end face of the glass sleeve 410 and be connected to the optical network. The WDM filter 500 can be placed inside the fiber optic assembly 400, preferably above the PD 310 for separating optical signals of different wavelengths transmitted in the fiber 420. Specifically, the optical signal transmitted by the LD 210 is transmitted through the WDM filter 500 to the optical network in the optical fiber 420, and the optical signal transmitted by the optical network is transmitted in the optical fiber 420 to be reflected to the PD 310 via the WDM filter 500.

Optionally, a recessed area is defined under the glass sleeve 410, and the light receiving component 300 is disposed in the recessed area.

Optionally, a truncation port corresponding to the WDM filter 500 is disposed above the recessed area of the glass sleeve 410 for placing the WDM filter 500, and the cut end penetrates the optical fiber 420 radially.

Referring to FIG. 2, FIG. 2 is a schematic structural diagram of a fiber optic assembly disclosed in an embodiment of the present invention. As shown in FIG. 2, there is a groove area under the glass sleeve 410, and a section is opened above the groove area. The fracture port penetrates the optical fiber 420 radially, that is, cuts the optical fiber 420. A WDM filter 500 is placed in the cut-off port, and the size of the cut-off port is adapted to the WDM filter 500. Since the PD 310 is placed under the WDM filter 500, in order to illuminate the optical signal reflected by the WDM filter 500 to the PD 310, the tilt angle of the cutoff can be appropriately adjusted to maximize the output of the optical signal reflected by the WDM filter 500. To PD310.

Optionally, the optical transmitting component 200 may further include: an MPD (Monitor Photo Diode) connected to the LD 210 for monitoring the working state of the LD 210.

Specifically, the MPD 230 can monitor the LD 210 in real time to monitor whether the LD 210 is working normally or abnormally. The abnormal operation may be that the LD 210 is degraded, such as optical power degradation.

Optionally, the bidirectional BOSA component shown in FIG. 1 may further include:

The carrying module 600 is disposed on the base 100 for carrying the MPD 230.

Specifically, the carrying module 600 may be made of an insulating material, and a metal conductor may be plated thereon, and connected to the first interface module 220 through a gold wire or an aluminum wire.

The isolation module 700 is disposed on the base 100 and is respectively connected to the LD 210 and the first interface module 220 for shielding electromagnetic radiation between the optical transmitting component 200 and the light receiving component 300. The LD 210 is disposed on the isolation module 700.

Specifically, the isolation module 700 can be made of a metal material, and the electromagnetic radiation between the transmission component 200 and the light receiving component 300 is shielded by the isolation module 700 to reduce the influence of electrical crosstalk. The first interface module 220 can transmit an electrical signal to the LD 210 through the isolation module 700. The isolation module 700 may be part of the base 100 (ie, integrally formed with the base 100), or may be a module that is additionally provided independently of the base 100.

Optionally, the height of the LD 210 coincides with the height of the first end a of the optical fiber 420.

Specifically, the LD 210 is horizontally aligned with the first end a of the optical fiber 420, so that the optical signal emitted by the LD 210 can be maximized and transmitted from the first end a of the optical fiber 420 into the optical fiber 420, thereby improving the LD 210 and the optical fiber 420. Degree of coupling between.

Optionally, the end surface of the glass tube sleeve 410 that is in contact with the first end a of the optical fiber 420 is an inclined surface of a predetermined angle, wherein the predetermined angle is an angle between the inclined surface and the vertical direction.

Optionally, the preset angle may range from 6 degrees to 8 degrees.

Specifically, the end faces of the glass sleeves 410 in the fiber optic assembly 400 are polished at a certain angle, such as an oblique octave.

In the embodiment of the present invention, the bidirectional BOSA component shown in FIG. 1 can be encapsulated by means of a sealant and a metal protective cover. The specific implementation manner is as follows: the optical transmitting component and the light receiving component are filled with a light path glue to realize integral filling. Cover and then cover it with a layer of water vapor barrier. Finally, on the basis of the filling, the external BOSA assembly is used to protect the entire BOSA component to achieve water vapor isolation and isolate the external electromagnetic influence.

In the bidirectional BOSA assembly shown in FIG. 1, the implementation of direct coupling of the laser LD and the optical fiber eliminates the lens structure and reduces the structural cost compared with the conventional BOSA; and the fiber assembly and the WDM filter are used to realize the pair. The optical path is limited, combined with the characteristics of waveguide integration and free-space optics to realize the BOSA structure, thereby improving the light-emitting rate of the BOSA. In addition, the package sealing method combined with the metal protective cover replaces the conventional hermetic package, which can reduce the packaging cost.

Please refer to FIG. 3a. FIG. 3a is a schematic structural diagram of another bidirectional BOSA assembly according to an embodiment of the present invention. The bidirectional BOSA component shown in FIG. 3a is optimized for the bidirectional BOSA component shown in FIG. 1. In comparison with the bidirectional BOSA assembly shown in FIG. 1, the first interface module 220 of the bidirectional BOSA assembly shown in FIG. 3a may include at least two first pins, and the second interface module 330 may include at least four second tubes. Foot; where:

The at least two first pins may receive an electrical signal sent by the first peripheral circuit, and the at least four second pins may send the electrical signal amplified by the TIA 320 to the second peripheral circuit.

In the embodiment of the present invention, light transmitted through the optical fiber 420 may be transmitted or reflected at the WDM filter 500. The optical fiber assembly 400 is respectively coupled to the LD 210 and the PD 310 placed on the base 100. The base 100 adopts a form similar to the TO base, and uses the pins to realize input and output of a transmission signal and a reception signal. Specifically, the electrical signal sent by the first peripheral circuit enters the LD 210 located at the end surface of the optical fiber assembly 400 through the first pin, and is converted into an optical signal by the LD 210, and then coupled into the optical fiber 420, and transmitted to the optical network via the WDM filter 500, and The optical signal of the optical network enters the optical fiber 420 and is reflected by the WDM filter 500 into the PD 310 located under the component, and converted into an electrical signal by the PD 310, amplified by the TIA 320 behind the PD 310, and finally output to the second periphery via the second pin. In the circuit. In addition, the first pin and the second pin are respectively separated from the base 100, and may be separated by a glass glue. Specifically, the area where the first pin is in contact with the base 100 is separated by a glass glue. The area where the second pin contacts the base 100 is also isolated by glass glue to electrically isolate it.

Please refer to FIG. 3b together. FIG. 3b is a top view of the bidirectional BOSA assembly shown in FIG. 3a. The figure shows mainly the top view structure of the light transmitting component 200 and the light receiving component 300 on the base 100. As shown in FIG. 3b, the LD 210 is placed above the isolation module 700, and the LD 210 is connected to the isolation module 700. The isolation module 700 is connected to the first pin 220 such that the first pin 220 transmits signals to the LD 210 through the isolation module 700. The PD 310 is placed above the TIA 320, and the two are connected, and the TIA 320 is connected to the second pin 330, so that the signal converted by the PD 310 is amplified by the TIA 320 and then sent by the second pin 330. As can be seen from FIG. 3b, the transmitting area and the receiving area are separated from each other in the layout, and the central area is provided with the isolation module 700, and the electromagnetic radiation sent to the receiving area is shielded by the isolation module 700 to reduce the influence of the electrical crosstalk. The components of the transmitting area and the receiving area can be interacted with external signals by means of gold wire soldering through pins placed on the base 100.

In the bidirectional BOSA component shown in FIG. 3a, the component transmits and receives signals through the pin; the implementation of the direct coupling of the laser LD and the optical fiber eliminates the lens structure and reduces the structural cost compared with the conventional BOSA; Fiber optic components and WDM filters to achieve optical path definition, combined with waveguide integration and free-space optics to achieve BOSA structure, which can improve the BOSA emission rate; in addition, the package is sealed with a metal protective cover instead of the traditional Air-sealed to reduce packaging costs.

Please refer to FIG. 4a. FIG. 4a is a schematic structural diagram of another bidirectional BOSA assembly according to an embodiment of the present invention. The bidirectional BOSA component shown in FIG. 4a is optimized for the bidirectional BOSA component shown in FIG. 1. In comparison with the bidirectional BOSA component shown in FIG. 1, the first interface module 220 of the bidirectional BOSA assembly shown in FIG. 4a may include a first spacer, and the second interface module 330 may include a second spacer;

A plurality of traces are disposed on the first pad and the second pad; wherein the first pad can receive the electrical signal sent by the first peripheral circuit through the trace distributed thereon, and the second pad can be distributed through The traces thereon send the TIA320 amplified electrical signal to the second peripheral circuit.

In the embodiment of the present invention, the material of the first spacer and the second spacer may be the same, and may be made of an insulating material, such as a ceramic spacer, a fiberglass spacer, a resin spacer, or the like, which is not limited in the embodiment of the present invention. A metal conductor may be plated on the upper surface of the first spacer, and a certain trace may be disposed on the metal conductor to be connected to the LD 210 and the peripheral circuit. Similarly, the upper surface of the second spacer can be plated A layer of metal conductors, and a certain trace on the metal conductor, connected to the PD310 and peripheral circuits.

Please refer to FIG. 4b together. FIG. 4b is a top view of the bidirectional BOSA assembly shown in FIG. 4a. The figure shows mainly the top view structure of the light transmitting component 200 and the light receiving component 300 on the base 100. As shown in FIG. 4b, in the transmitting area, the peripheral electrical signal passes through the peripheral interface of the transmitting area, passes through the trace on the first pad 220, enters the LD210, and is transmitted through the optical fiber assembly 400 after being converted by electro-optical. In the receiving area, the optical signal transmitted by the optical network is photoelectrically converted into an electrical signal by the PD 310, amplified by the TIA 320, and then passed through the trace on the second pad 330 to be output through the peripheral interface of the receiving area. Through the pad routing of the transmitting area and the receiving area, the signal exchange between the transmitting and receiving on the two-way BOSA and the outside world is realized. In addition, gold wire soldering can be used to establish the connection between the components of the transmitting area and the receiving area.

In the bidirectional BOSA assembly shown in FIG. 4a, the component transmits and receives signals by providing a trace on the insulating spacer; the implementation of directly coupling the laser LD with the optical fiber eliminates the lens structure compared to the conventional BOSA, thereby Reduce the structural cost; and use fiber optic components and WDM filters to achieve optical path definition, combined with waveguide integration and free-space optics to achieve BOSA structure, which can improve the BOSA emission rate; in addition, the use of sealing and sealing metal cover The packaging method replaces the traditional hermetic package, which can reduce the packaging cost.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of another bidirectional BOSA assembly according to an embodiment of the present invention. The bidirectional BOSA component shown in FIG. 5 is optimized for the bidirectional BOSA component shown in FIG. 3a. Compared with the bidirectional BOSA assembly shown in FIG. 3a, the optical fiber 420 in the bidirectional BOSA assembly shown in FIG. 5 may be a tapered optical fiber, wherein the first end a of the optical fiber 420 is a cone (as shown by the dotted circle in FIG. 5). ).

In the embodiment of the present invention, since the optical signal transmission is performed by directly coupling the LD 210 and the optical fiber 420 without the conversion of the lens, in order to ensure that enough optical signals are coupled into the optical fiber 420 for output, the optical fiber component can be 400 to make some improvements, you can use the taper fiber to replace the ordinary fiber. The tapered optical fiber is an optical fiber that is tapered at the end surface. Specifically, the optical fiber 420 can be subjected to taper processing near one end of the LD 210 (ie, the first end a). Compared with common fiber, the tapered fiber has a smaller core diameter and a higher coupling degree with the LD210, thereby improving the light output power of the BOSA.

In the bidirectional BOSA assembly shown in FIG. 5, the taper fiber is used to replace the common fiber, which can improve the coupling efficiency between the LD and the fiber, thereby improving the optical power of the BOSA.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of another bidirectional BOSA assembly according to an embodiment of the present invention. The bidirectional BOSA component shown in FIG. 6 is optimized for the bidirectional BOSA component shown in FIG. 4a. Compared with the bidirectional BOSA assembly shown in FIG. 4a, the optical fiber 420 in the bidirectional BOSA assembly shown in FIG. 6 may be a tapered optical fiber, wherein the first end a of the optical fiber 420 is a cone (as shown by the dotted circle in FIG. 6). ). In addition, the bidirectional BOSA component shown in FIG. 6 differs from the bidirectional BOSA component shown in FIG. 5 only in that the pad is replaced by a pad, and the performance of the two BOSA components is the same, that is, the taper fiber is used instead of the ordinary fiber. For the specific implementation of the LD210 and the optical fiber, refer to the content described in the bidirectional BOSA component shown in FIG. 5, and details are not described herein again.

Please refer to FIG. 7. FIG. 7 is a schematic structural diagram of another bidirectional BOSA assembly according to an embodiment of the present invention. The bidirectional BOSA component shown in FIG. 7 is optimized for the bidirectional BOSA component shown in FIG. 3a. Compared with the bidirectional BOSA assembly shown in FIG. 3a, the optical fiber 420 in the bidirectional BOSA assembly shown in FIG. 7 may be a lens optical fiber, wherein the first end a of the optical fiber 420 is a lens (as shown by the dashed circle in FIG. 7).

In the embodiment of the present invention, the lens fiber can be used to replace the common fiber, that is, the lens fiber is used to fabricate the fiber component to improve the fiber component. The lens fiber is an optical fiber that processes the microlens on the end surface. Specifically, the fiber 420 can be processed into a lens near the end of the LD 210 (ie, the first end a), thereby improving the coupling efficiency between the LD 210 and the optical fiber.

In the bidirectional BOSA assembly shown in FIG. 7, replacing the ordinary optical fiber with the lens fiber can improve the coupling efficiency between the LD and the optical fiber, thereby improving the optical power of the BOSA.

Please refer to FIG. 8. FIG. 8 is a schematic structural diagram of still another bidirectional BOSA component according to an embodiment of the present invention. The bidirectional BOSA component shown in FIG. 8 is optimized for the bidirectional BOSA component shown in FIG. 4a. Compared with the bidirectional BOSA assembly shown in FIG. 4a, the optical fiber 420 in the bidirectional BOSA assembly shown in FIG. 8 may be a lens optical fiber, wherein the first end a of the optical fiber 420 is a lens (as shown by the dashed circle in FIG. 8). In addition, the bidirectional BOSA component shown in FIG. 8 differs from the bidirectional BOSA component shown in FIG. 7 only in that the pad is replaced by a pad, and the performance of the two BOSA components is uniform, and the lens fiber is used instead of the ordinary fiber to improve. For the specific implementation of the coupling efficiency between the LD 210 and the optical fiber, refer to the content described in the bidirectional BOSA component shown in FIG. 7 , and details are not described herein again.

Please refer to FIG. 9. FIG. 9 is a schematic structural diagram of an optical module according to an embodiment of the present invention. As shown in FIG. 9, the optical module may include at least the bidirectional BOSA component shown in any one of FIG. 1, FIG. 3a, FIG. 3b, FIG. 4a, FIG. 4b, and FIG. 5-8, the specific structure of the bidirectional BOSA component and Function in the aforementioned correspondence The embodiments have been described in detail, and are not described in detail in the embodiments of the present invention. In addition, the optical module may further include a peripheral circuit, such as the first peripheral circuit and the second peripheral circuit, and the two peripheral circuits may be the same circuit or different circuits, which is not limited thereto. The function of the peripheral circuit may be to send and receive signals to the bidirectional BOSA component, ie to implement signal interaction with the bidirectional BOSA component. By integrating the bidirectional BOSA component into the optical module, the cost of the optical module can be reduced.

Please refer to FIG. 10. FIG. 10 is a schematic structural diagram of a PON system according to an embodiment of the present invention. As shown in FIG. 10, the PON system includes an OLT, at least one ONU (such as ONU1, ONU2, ..., ONUx), and an ODN connecting the OLT and the ONU. The optical module shown in FIG. 9 is included in the OLT and the ONU, and the specific functions and structures of the OLT and the ONU may be referred to in the foregoing embodiments. In the PON system shown in FIG. 10, an optical module integrated with a low-cost bidirectional BOSA component is disposed in the OLT and the ONU, which can greatly reduce system cost.

In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not described in detail in a certain embodiment can be referred to the related descriptions of other embodiments.

The modules in the bidirectional BOSA component of the embodiment of the present invention may be combined, divided, and deleted according to actual needs.

The two-way BOSA component, the optical module, and the PON system disclosed in the embodiments of the present invention are described in detail. The principles and implementation manners of the present invention are described in the specific examples. The description of the above embodiments is only used for To help understand the present invention and its core ideas; at the same time, for those of ordinary skill in the art, in accordance with the idea of the present invention, there will be changes in the specific embodiments and applications, and in summary, the contents of this specification should not It is understood to be a limitation of the invention.

Claims

A bidirectional BOSA assembly, comprising: a base and an optical transmitting component, a light receiving component, a fiber optic component, and a wavelength division multiplexing WDM filter disposed on the base, wherein:

The optical transmitting component includes a laser diode LD and a first interface module, the LD is connected to the first interface module, and the first interface module is configured to receive an electrical signal sent by the first peripheral circuit, where the LD is used for Converting the electrical signal received by the first interface module into an optical signal;

The light receiving component includes a photodiode PD, a transimpedance amplifier TIA and a second interface module, the PD is connected to the TIA, the TIA is connected to the second interface module, and the PD is used in an optical network. The optical signal is converted into an electrical signal, the TIA is used to amplify the electrical signal converted by the PD, and the second interface module is configured to send the amplified electrical signal to the second peripheral circuit;

The fiber optic assembly includes a glass sleeve and an optical fiber, the optical fiber is disposed in the glass sleeve, a first end of the optical fiber is attached to an end surface of the glass sleeve, and a second end of the optical fiber is Optical network connection;

The WDM filter is disposed within the fiber optic assembly for separating an optical signal transmitted by the LD in the optical fiber from an optical signal transmitted by the optical network in the optical fiber.
The bidirectional BOSA assembly according to claim 1, wherein a recessed area is defined under the glass sleeve, and the light receiving component is disposed in the recessed area.
The bidirectional BOSA assembly of claim 2, wherein a truncation port of a size corresponding to the WDM filter is disposed above the recessed area for placing the WDM filter, the truncated aperture Passing through the fiber.
The two-way BOSA assembly according to any one of claims 1 to 3, wherein the optical transmitting component further comprises:

A backlight detector MPD is connected to the LD for monitoring an operating state of the LD.

A carrying module is disposed on the base for carrying the MPD.
A two-way BOSA assembly according to any one of claims 1 to 4, further comprising include:

An isolation module is disposed on the base and connected to the LD and the first interface module respectively for shielding electromagnetic radiation between the optical transmitting component and the light receiving component;

The LD is disposed on the isolation module, and the LD is at the same height as the first end of the optical fiber.
The bidirectional BOSA assembly according to any one of claims 1 to 5, wherein the first interface module comprises at least two first pins, and the second interface comprises at least four second pins;

The first interface module receives an electrical signal sent by the first peripheral circuit by using the at least two first pins, and the second interface module uses the at least four second pins to send the TIA The amplified electrical signal is sent to the second peripheral circuit.
The two-way BOSA assembly according to any one of claims 1 to 5, wherein the first interface module is a first pad, the second interface module is a second pad, and the first a plurality of traces are disposed on the spacer and the second spacer;

The first pad receives an electrical signal sent by the first peripheral circuit through a trace, and the second pad sends the TIA amplified electrical signal to the second peripheral circuit through a trace.
The bidirectional BOSA assembly according to any one of claims 1 to 7, wherein an end surface of the glass sleeve that is in contact with the first end of the optical fiber is an inclined surface of a predetermined angle, The preset angle is an angle between the inclined surface and the vertical direction.
A bidirectional BOSA assembly according to any one of claims 1-8, wherein the optical fiber is a tapered optical fiber or a lens optical fiber.
An optical module, comprising the bidirectional BOSA assembly of any of claims 1-9.
A passive optical network PON system, comprising: an optical line terminal OLT, At least one optical network unit ONU and a light distribution network ODN connecting the OLT and the at least one ONU, wherein the OLT and the at least one ONU comprise the optical module according to claim 10.