WO2021115129A1

WO2021115129A1 - Optical module

Info

Publication number: WO2021115129A1
Application number: PCT/CN2020/131835
Authority: WO
Inventors: 梁付运; 郑萌; 汤金宽
Original assignee: 长飞光纤光缆股份有限公司
Priority date: 2019-12-10
Filing date: 2020-11-26
Publication date: 2021-06-17
Also published as: CN111313969B; CN111313969A

Abstract

The present invention relates to the field of optical communications. Disclosed is an optical module, comprising a multi-path optical transmitting device and a multi-path optical receiving device. A multi-path transmitter component comprises a metal member adhered to a circuit board. An upper part of the multi-path transmitter component is used for placing elements such as a multi-path laser, a PLC chip, and a lens. The laser is electrically connected to the circuit board by means of gold wire welding. The laser passes an optical light through the lens located between the PLC chip and the laser. A laser light emitted by a corresponding laser is coupled into a corresponding PLC chip port, is multiplexed, and then enters an optical fiber component, and is output to an external optical fiber by means of an optical interface. The multi-path optical receiving device directly places a photodiode and a transimpedance amplifier onto the circuit board. An external optical signal enters the optical fiber component by means of the optical interface, is split by an optical beam splitter, and then reflected into a corresponding photodiode for optical reception, which achieves the conversion from the optical signal to an electrical signal. The element used for packaging can be reduced, and the volume is reduced.

Description

An optical module

Technical field

The present invention belongs to the field of optical communication technology, and more specifically, relates to an optical module.

Background technique

In recent years, due to the development and application of access networks and data centers, it is necessary to find a more cost-effective way to expand bandwidth to increase network capacity. According to the traditional scheme, large-scale connection point distribution and fiber optic cable densification are taking place. Each node needs an optical fiber for interconnection, so the demand for optical fiber is spirally rising, and the space and physical path for laying these optical fibers are limited.

The existing solution to this problem usually adopts WDM system, but the current WDM module either adopts a free space implementation scheme, mainly parallel light, which is reflected by multiple optical bandpass films to achieve light separation and synthesis. The long optical path causes the optical path. The stability is poor, and the process is complicated, which is not conducive to production; either the small laser component TOSA is used, the beam splitting uses the AWG coupling FA array coupling component, and the ceramic pin is used to connect with the small TOSA, which requires large size space and troublesome fiber optics. The cost is also higher.

Summary of the invention

In view of the above defects or improvement requirements of the prior art, the present invention proposes an optical module, which has a simple structure, a higher packaging density than existing solutions, a relatively simple and stable process, and a more advantageous cost. Mass production.

In order to achieve the above-mentioned objective, the present invention provides an optical module, including: a multi-path optical transmitting device and a multi-path optical receiving device;

The multi-path light emitting device includes: N lasers, N coupling lenses, a multiplexing module, a first optical fiber connector, and an output port;

The multi-path optical receiving device includes: an input port, a second optical fiber connector, a demultiplexing module, and N photoelectric detection modules; where N is a positive integer;

The N lasers emit N laser beams, and the N laser beams are respectively coupled through the N coupling lenses corresponding to the N lasers, and then enter the multiplexing module, and the N laser beams are combined by the multiplexing module. After the coupled laser beam is converged into a combined beam, it enters the output port through the first optical fiber connector;

The input port emits a laser beam, the laser beam enters the demultiplexing module through the second optical fiber connector, and the demultiplexing module demultiplexes into N demultiplexed light beams and then enters the corresponding N waveguide ports, The N split-wave beams respectively pass through the N waveguide ports and enter the photoelectric detection module corresponding to each waveguide port.

Preferably, the multiplexing module and the demultiplexing module are both implemented by a PLC chip, and the first optical fiber connector and the second optical fiber connector are both implemented by an optical fiber array FA.

Preferably, the laser wavelengths output by the N lasers are different.

Preferably, the N lasers realize the electrical connection between each of the lasers and the PCBA by welding gold wires and adopting thermosonic welding.

Preferably, the N lasers, the N coupling lenses, and the multiplexing module are all placed on the same metal carrier, and the metal carrier is bonded to the PCBA through a plane, and the PCBA includes a limiting structure. , To define the position of the metal carrier to facilitate the placement and positioning of the metal carrier.

Preferably, the multi-path optical receiving device further includes: a transimpedance amplifier;

After passing through the N waveguide ports, the N split-wave beams enter the photodetection module corresponding to each waveguide port, and then are amplified by the transimpedance amplifier and output.

Preferably, the demultiplexing module and the N photodetection modules are directly coupled; or, the end faces of the demultiplexing module and the N photodetection modules are made into a preset angle to The N-channel demultiplexed light beams are reflected into each of the photoelectric detection modules through the end surface.

Preferably, a plurality of positioning holes are opened at the corresponding positions where the multi-path light receiving device is placed on the PCBA, corresponding to the positioning protrusions on the housing of the multi-path light receiving device.

Preferably, the first optical fiber connector is connected to the output port through a first optical fiber; the input port is connected to the second optical fiber connector through a second optical fiber.

Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects: The optical module of the present invention includes multiple optical emitting devices and multiple optical receiving devices, and multiple optical emitting devices. Including: N lasers, N coupling lenses, multiplexing modules, first optical fiber connectors and output ports; multi-path optical receiving devices include: input ports, second optical fiber connectors, demultiplexing modules, and N photoelectric detection modules. The invention has simple structure and process, because it is directly integrated and packaged, it requires fewer components and lower cost; and the optical path is simple, the free optical path is shorter, and the optical path is more stable.

Description of the drawings

Figure 1 is a top view of an embodiment of the present invention after opening the outer cover;

Figure 2 is a top view of an optical module provided by an embodiment of the present invention;

Figure 3 is a side view of an embodiment of the present invention;

Figure 4 is a base structure provided by an embodiment of the present invention;

Figure 5 is a PCBA structure provided by an embodiment of the present invention;

FIG. 6 is an effect diagram after assembly of a base and PCBA according to an embodiment of the present invention;

FIG. 7 is an electrical connection structure between a laser and a PCBA provided by an embodiment of the present invention;

Figure 8 is a receiving end outer protective cover provided by an embodiment of the present invention;

Among them, 1 is the output end of the multiple light emitting device, 2 is the FA of the multiple light emitting device, 3 is the metal carrier, 3-1 is the right positioning surface of the metal carrier, and 3-2 is the left positioning surface of the metal carrier. 3-3 is the bonding surface between metal carrier and PCBA, 4 is PLC MUX, 5 is coupling lens, 6 is laser, 7 is PCBA, 8 is PCBA electrical output interface, 9 is the housing positioning hole of multi-path optical receiving device, 10 It is TIA, 11 is PD, 12 is PLC Demux, 13 is FA avoiding hole on PCBA to receive PLC, 14 is FA at the end of multi-channel optical receiving device, 15 is input of multi-channel optical receiving device, 16 is multi-channel optical receiving The housing of the device, 16-1 is the outer cover positioning post of the multi-path optical receiving device, 17 is the housing of the multi-path optical transmitting device, and 18 is the gold wire for electrical connection between the laser and the PCBA.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

The present invention adopts optical waveguide PLC chip technology. The multi-channel optical transmitting device at the transmitting end multiplexes and couples multiple lasers through the PLC chip into an optical fiber for transmission, and the multi-channel optical receiving device at the receiving end uses PLC to receive multiple channels. The optical signal is decomposed and transmitted to the corresponding photodiode PD for reception.

The embodiment of the present invention provides an optical module, including: a multi-path optical transmitting device and a multi-path optical receiving device;

The multi-path optical transmitting device includes: N lasers, N coupling lenses, multiplexing module, first optical fiber connector and output port;

N lasers emit N laser beams, and the N laser beams are respectively coupled through the N coupling lenses corresponding to the N lasers, and then enter the multiplexing module. The multiplexing module converges the N coupled laser beams into a multiplexed beam. , Enter the output port through the first optical fiber connector;

The input port emits a laser beam, and the laser beam enters the demultiplexing module through the second optical fiber connector. The demultiplexing module demultiplexes into N demultiplexed beams and then enters the corresponding N waveguide ports. The N demultiplexed beams respectively pass through N waveguides. After the port, enter the photodetection module corresponding to each waveguide port.

As shown in FIGS. 1, 2 and 3, FIG. 1 is a top view of an optical module provided by an embodiment of the present invention with the outer cover opened, and FIG. 2 is a top view of an optical module provided by an embodiment of the present invention. Fig. 3 is a side view provided by an embodiment of the present invention. It should be noted that the optical module illustrated in Fig. 1, Fig. 2 and Fig. 3 is only an optional implementation, as shown in Fig. 1. The optical module provided by the embodiment of the present invention includes: a multi-channel optical transmitting device and a multi-channel optical receiving device;

Among them, PCBA 7 inputs 4 drive signals to 4 lasers 6 through PCBA electrical output interface 8, so that each laser emits laser signals, thereby converting the electrical signals into optical signals, which pass through the interface between the laser 6 and the PLC chip 4. The corresponding coupling lens 5 is coupled into the input port corresponding to the PLC chip 6 one-to-one, the light entering the PLC chip 6 is combined with the light by the PLC chip and then coupled to the FA 2 and enters the optical fiber to be output through the receiving end 1.

The lasers usually have different wavelengths, for example, they can be 1270 nm, 1290 nm, 1311 nm, and 1331 nm respectively. In the embodiment of the present invention, the corresponding channels of the laser 6, the coupling lens 5, and the PLC chip 4 correspond one-to-one.

As an optional implementation manner, the 4-channel laser may be a separate laser or an array of 4-channels together.

As an optional implementation, the coupling lens may be a single discrete lens or an array of 4 lenses.

In the embodiment of the present invention, the coupling between the laser and the PLC chip is shaped and converged by the lens to couple the light emitted by the laser into the PLC chip. The optical coupling efficiency can be adjusted by selecting the lens and adjusting the distance between the PLC and the laser. Control the final output optical power within the required range. The packaging density can be increased, the components used in the packaging can be reduced, the volume is reduced, and the cost is reduced.

As an optional implementation, as shown in FIG. 7, the 4 lasers are electrically connected between the laser and the PCBA by welding the gold wire 18 and using thermosonic welding, so that the PCBA transmits the electrical signal to the laser and converts it into light. signal.

In the embodiment of the present invention, the lasers, PLCs, and lenses in the multi-path light emitting device are all placed on the same metal carrier 3. As shown in FIG. 5, the metal carrier 3 is pasted on the PCBA 7 through the metal carrier plane 3-3. At the same time, the 3-1 and 3-2 structures on the PCBA board can play the role of limiting the metal carrier and facilitate the placement and positioning of the metal carrier. Specifically, there are two symmetrical raised structures on the PCBA board, each raised The structure includes a groove 3-1 and a boss 3-2, and the groove 3-1 and the boss 3-2 are adjacent, as shown in the examples shown in Figure 4, Figure 5 and Figure 6, the PCBA and When the metal carriers are mounted together, the position of the PCBA is limited.

Among them, as shown in Figure 2 and Figure 5, the 3-1 and 3-2 structures can use the front and side positioning surfaces to limit the position of the outer cover 17, and the outer cover on the side of the multiple light emitting device It is clamped on the metal carrier to facilitate the positioning and installation of the outer cover.

As an optional implementation manner, the metal carrier can adopt a direct mounting structure design, which can be automatically mounted in batches, which can improve production efficiency.

In the embodiment of the present invention, the multi-channel optical receiving device couples the multi-channel laser signal through the receiving end 15 into the demodulation receiving end PLC chip 12 through the optical fiber and the FA 14. The FA 14 is located on the PCBA to receive the FA of the PLC. On the avoidance hole 13, the receiving end PLC chip 12 separates the received multiple laser signals, and inputs them into the corresponding waveguide ports. Each output port corresponds to a photodiode PD 11, which receives the corresponding optical signal and will receive the corresponding optical signal. The optical signal is converted into an electrical signal, and then amplified by a trans-impedance amplifier (TIA) 10 and output.

As an optional implementation manner, a direct coupling form is usually adopted between the demodulated PLC chip 12 and the received photodiode 11, and the emitted signal light is directly irradiated or by connecting the PLC chip 12 and the photodiode 11 corresponding to each other. The end surface is ground to a certain angle, and the PD is irradiated into the PD through the reflection of the end surface.

Wherein, the angle can be determined according to actual needs. Usually, the angle is about 41°. The specific angle used is not uniquely limited in the embodiment of the present invention.

In the embodiment of the present invention, as shown in FIG. 8, two positioning holes 9 are opened in the area where the multi-path light receiving device is placed on the PCBA, corresponding to the positioning protrusions 16-1 on the housing 16 of the multi-path light receiving device. Used to locate the housing of the multi-path optical receiving device, which is convenient for positioning and installation.

As an optional implementation manner, the housings of the multi-path light emitting device and the multi-path light receiving device can also be mounted by automatic placement equipment to improve production efficiency.

In the embodiment of the present invention, the FA adopted by the multi-path light emitting device and the multi-path light receiving device adopts the form of straight-out fiber, which avoids the complicated fiber coiling process and can also achieve high production efficiency.

It needs to be pointed out that according to the needs of implementation, each step/component described in this application can be split into more steps/components, or two or more steps/components or partial operations of steps/components can be combined into new ones. Steps/components to achieve the purpose of the present invention.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present invention, All should be included in the protection scope of the present invention.

Claims

An optical module, which is characterized in that it comprises: a multi-path light emitting device and a multi-path light receiving device;

The multi-path light emitting device includes: N lasers, N coupling lenses, a multiplexing module, a first optical fiber connector, and an output port;

The multi-path optical receiving device includes: an input port, a second optical fiber connector, a demultiplexing module, and N photoelectric detection modules; where N is a positive integer;

The N lasers emit N laser beams, and the N laser beams are respectively coupled through the N coupling lenses corresponding to the N lasers, and then enter the multiplexing module, and the N laser beams are combined by the multiplexing module. After the coupled laser beam is converged into a combined beam, it enters the output port through the first optical fiber connector;

The input port emits a laser beam, the laser beam enters the demultiplexing module through the second optical fiber connector, and the demultiplexing module demultiplexes into N demultiplexed light beams and then enters the corresponding N waveguide ports, The N split-wave beams respectively pass through the N waveguide ports and enter the photoelectric detection module corresponding to each waveguide port.
The optical module according to claim 1, wherein the multiplexing module and the demultiplexing module are both implemented by PLC chips, and the first optical fiber connector and the second optical fiber connector are both implemented by optical fiber arrays. FA implementation.
The optical module according to claim 1 or 2, wherein the laser wavelengths output by the N lasers are different.
3. The optical module according to claim 3, wherein the N lasers realize the electrical connection between each of the lasers and the PCBA by welding gold wires and adopting thermosonic welding.
The optical module according to claim 4, wherein the N lasers, the N coupling lenses, and the multiplexing module are all placed on the same metal carrier, and the metal carrier communicates with the The PCBA is pasted, and the PCBA includes a limiting structure to limit the position of the metal carrier and facilitate the mounting and positioning of the metal carrier.
The optical module according to claim 1 or 2, wherein the multi-path optical receiving device further comprises: a transimpedance amplifier;

After passing through the N waveguide ports, the N split-wave beams enter the photodetection module corresponding to each waveguide port, and then are amplified by the transimpedance amplifier and output.
The optical module according to claim 6, wherein a direct coupling form is adopted between the demultiplexing module and the N photodetection modules; or, the demultiplexing module and the N photodetection modules are directly coupled. The corresponding end face of the module is made into a preset angle, so that the N beams are reflected into each of the photoelectric detection modules through the end face.
The optical module according to claim 7, wherein a plurality of positioning holes are opened on the PCBA at the corresponding positions where the multi-path light receiving device is placed, which are similar to the positioning protrusions on the housing of the multi-path light receiving device. correspond.
The optical module according to claim 1, wherein the first optical fiber connector is connected to the output port through a first optical fiber; the input port is connected to the second optical fiber connector through a second optical fiber.