TWI454005B - Packaging structure and method for butterfly laser module - Google Patents

Description

Butterfly laser module structure and method

The invention relates to a butterfly laser module assembly structure and method, in particular to a laser module assembly with short assembly process time, low cost, good coupling efficiency and improved yield. The structure is accomplished by simplifying the fabrication process to secondary coupled light to achieve the above-described effects.

According to the news, today's communication technology is changing with each passing day. With the establishment of communication facilities such as telephone and Internet, the distance between people is getting closer and closer, and the transmission of communication facilities is carried out wirelessly or by wire, but wireless transmission will be used. The influence of weather and terrain makes the interference problem during communication unable to be effectively controlled and solved. Therefore, wired transmission is still the most effective and stable signal transmission method in current communication.

However, the wired transmission is to transmit an electronic signal or an optical signal through the cable as a transmission path of the signal, wherein the transmission mode of the optical signal is the fastest (more than 11 bit-per-second), and the optical signal The transmission medium is a fiber optic (Fiber Optics) cable, and the optical fiber communication has the advantages of high bandwidth, light weight, high signal correctness, long transmission distance, and no external electromagnetic interference; and in the optical fiber communication system, The transmitting end must have a light emitting module to convert the electrical signal into an optical signal. When the optical signal arrives at the receiving, the optical receiving signal is also converted into an electrical signal by the optical receiving module, so that a fiber-optic communication system can be constructed.

The general semiconductor laser module construction type can be divided into the following three types: coaxial structure, double-row line structure and butterfly structure, in which butterfly laser mode is used for high speed and high power. Optical signal transmission. However, in the laser assembly process, the most important part is the coupling and fixing of the coupling between the optical fiber and the laser. Generally, the optical communication laser module uses laser welding as a fixed combination, and the laser Welding has the advantages of fast assembly speed, high repeatability and high reliability. However, in the process of laser welding, the metal material absorbs the light energy emitted by the laser and converts it into heat energy, and the material melts due to heat energy and instantaneously. Condensation, resulting in a change in the type, this type of change, will produce a lot of thermal stress, so that the fiber changes the original optimal position, resulting in a change in the coupling power, and the fiber is produced before and after welding The displacement, called the post-weld displacement, the greater the displacement after welding, which will affect the coupling efficiency of the entire laser module.

While the traditional butterfly laser module is actually assembled, a two-beam laser welding system is used to connect the fiber ferrule and the laser diode, and most of them are in light alignment and structure. Because the fiber itself is a small and easily broken glass material, it is often necessary to fix the fiber in a protective sleeve before the fiber is aligned and fixed (especially by laser welding). The outer surface of the gold-plated fiber is soldered into the metal tube by solder (lead tin or gold tin) technology to form a fiber-solder-sleeve fiber sleeve. Therefore, only the fiber sleeve and the laser are processed in the operation of the fiber alignment step. Alignment, after the fiber is aligned, the saddle fastener is fastened to the fiber sleeve, and the two-beam laser welding method is used to fix the saddle fastener, the fiber sleeve and the base. Due to the transformation of the post-weld displacement (postweld PWS), the butterfly laser module has low coupling efficiency, low yield and high threshold. The key technologies are saddle fasteners and fiber ferrules. In combination with the pedestal; in the conventional butterfly laser module construction, the PWS is large when the saddle fastener is soldered to the fiber ferrule by the laser (after being adjusted). Therefore, the coupling efficiency and the yield are low, and the process time is increased in order to increase the coupling efficiency and must be combined with the laser hammer recovery, and the yield is not high.

The reason is that the inventor has in view of this, and has been researching and improving the existing structure for many years of rich design and development and practical production experience of the relevant industry, thus inventing a butterfly laser module construction structure and method, in order to achieve The purpose of better practical value.

The main object of the present invention is to provide a structure and a method for constructing a butterfly laser module, which is a laser module structure with short assembly process time, low cost, good coupling light efficiency and improved yield. The mounting structure is completed by simplifying the assembly process to the secondary coupling light to achieve the above effects.

The purpose and function of the structure and method of the butterfly laser module of the present invention are achieved by the following technologies:

The module comprises upper and lower components, the lower component is a substrate comprising a light source emitting component and a curved fastener fixedly coupled to the substrate, and the upper component is combined with a curved fastener. The sleeve is formed by a sleeve embedded in an assembled optical fiber; thereby, the first coupling of the optical fiber and the sleeve for the upper component and the sleeve of the upper and lower components are combined with the curved fastener for the second time Coupling light, achieving the effect of short assembly process time, low cost, better coupling efficiency and improved yield.

The light source emitting member in the structure and method of the butterfly laser module of the present invention further comprises a laser diode, a light detecting diode and a thermistor.

The curved fastener in the structure and method of the butterfly laser module of the present invention is further designed by the shape of the curved fastener, and can be easily connected with the butterfly casing (circuit), and the original The traditional butterfly laser module is electrically identical.

The fiber-optic sleeve structure in the structure and method of the butterfly laser module of the present invention can further be configured as an elliptical fiber lens to serve as a constructor of the fiber amplifier.

For a more complete and clear disclosure of the technical content, the purpose of the invention and the effects thereof achieved by the present invention, it is explained in detail below, and please refer to the drawings and drawings:

First, please refer to the first to third figures. The schematic diagram of the structure and method of the butterfly laser module structure of the present invention is mainly welded to the base shell (3) with a laser module (A), which includes:
A lower assembly (1) is composed of a substrate (11) and a curved fastener (12), and a laser diode (131) and an electro-optical diode (132) are constructed on the substrate (11). And a light source emitting component (13) of the thermistor (133), and the curved fastener (12) is correspondingly covered on the substrate (11) and fastened on both sides of the substrate (11), and the curved fastener ( 12) There are through holes (121) for the passage of the lines on both sides;
An upper assembly (2) is formed by a sleeve (21) that is coupled to the curved fastener (12) and correspondingly fitted with a sleeve (22) for assembling the optical fiber.

Please refer to the first to fourth figures. When constructing, the steps are as follows:

(a) The substrate (11) having the light source emitting component (13) is corresponding to the curved fastener (12), and the curved fastener (12) is combined with the substrate (11) in a tightly fitting manner to complete the lower component. (1) configuration;

(b) placing a fiber optic sleeve (22) (Fiber Ferrule) into the sleeve (21) (Sleeve) to couple with the laser diode (131);

(c) Find the best coupling position, perform laser welding on the sleeve (22) and the sleeve (21), and recouple the fiber sleeve (22) and the sleeve (21) to complete the upper assembly (2) )Configuration;

(d) Place the upper and lower components (2) and (1) above the configuration on the processing machine to drive the laser. When the fiber ferrule (22) and the metal sleeve (21) are in the optimal coupling efficiency. Then, the platform on the machine is used to couple light to the optimal position, and the upper and lower components (2) and (1) are fixed by laser welding.
When the upper and lower components (2), (1) are fixed to form a laser module (A), and then the laser module (A) is combined with the base shell (3), the following steps are as follows:

(e) The base case (3) is provided with a thermoelectric cooler (31), and the laser module (A) is placed in the thermoelectric cooler (31) of the base case (3) by a wire bonding machine. Become a complete butterfly laser module.

In the structure of the laser structure of the present invention, the alignment and bonding of the fiber tip and the laser diode (131) are performed, which determines the yield of the module. The laser module of the present invention has a shorter processing time than the original butterfly laser module, is cheaper, has better coupling efficiency and higher yield; and is divided by a laser module (A). The lower components (2) and (1) are independently carried out, and combined with the new construction technology of the high-speed butterfly laser module, the high-speed butterfly laser module is constructed by TO-Butterfly TOSA. Significantly reduce the time required for the process and reduce costs.

However, the above-described embodiments or drawings are not intended to limit the structure or the use of the present invention, and any suitable variations or modifications of the invention will be apparent to those skilled in the art.

From the above, it can be seen that the composition of the present invention and the implementation description are comparable to the conventional devices, and we can know the structure and method of the butterfly laser module assembly, which have the following advantages, as follows:

1. The saddle fastener used in the traditional butterfly laser module is expensive, and its design shape is convenient for laser compensation design. When welded, the overall structural strength is lower than that of the new butterfly laser module. The threshold of the structure technology is high; the butterfly laser module assembly technology of the invention has the advantages of low component materials, strong component structure, low welding technique and high reliability.
2. Compared with the traditional butterfly module, the butterfly laser module of the present invention independently carries out the upper and lower components of the laser module component, and then combines with the outer casing to reduce the difficulty of the process. , thereby reducing process time.
3. When the traditional butterfly laser module is assembled, it generates the main post-weld displacement direction, which affects the coupled light power (Y-axis). In contrast, the butterfly laser module of the present invention is mainly composed. The direction of displacement after welding is not only limited, but also has little effect on the coupling efficiency (Z-axis).
4. The laser module is designed to replace the 2-beam laser welding system with a 3-beam laser welding system, which is specially designed for the dual beam laser welding system. The relative cost is more expensive than the three-beam laser welding system, so the cost can be reduced and the butterfly laser module can be more competitive.
5. In the conventional butterfly type laser module assembly, since the fiber ferrule having the elliptical fiber lens cannot be constructed, the present invention can utilize the rotational coupling light to construct the elliptical fiber lens, and further serve as the structure of the fiber amplifier. Installer.

In summary, the embodiments of the present invention can achieve the expected use efficiency, and the specific structure disclosed therein has not been seen in similar products, nor has it been disclosed before the application, and has completely complied with the provisions of the Patent Law. And the request, the application for the invention of a patent in accordance with the law, please forgive the review, and grant the patent, it is really sensible.

<present invention>

(A). . . Laser module

(1). . . Lower component

(11). . . Substrate

(12). . . Curved fastener

(121). . . Through hole

(13). . . Light source emitting component

(131). . . Laser diode

(132). . . Light diode

(133). . . Thermistor

(2). . . Upper component

(twenty one). . . Sleeve

(twenty two). . . casing

(3). . . Base shell

(31). . . Thermoelectric cooler

First figure: exploded view of the upper component of the present invention

Second figure: exploded view of the lower part of the present invention

Third figure: a schematic diagram of the combination of the present invention

Fourth: Schematic diagram of the assembled base of the present invention

(A). . . Laser module

(1). . . Lower component

(11). . . Substrate

(12). . . Curved fastener

(121). . . Through hole

(131). . . Laser diode

(2). . . Upper component

(twenty one). . . Sleeve

(twenty two). . . casing

Claims (10)

A butterfly laser module structure is mainly characterized in that a laser module is soldered in a base shell, and the system comprises:
A lower assembly is composed of a substrate and a curved fastener. The light source emitting component is constructed on the substrate, and the curved fastener is correspondingly covered on the substrate and fastened on both sides of the substrate. Both sides of the piece are provided with through holes for threading, so that the through holes are connected with the base shell;
An upper assembly is formed by a sleeve that is assembled with an optical fiber by a sleeve that is coupled to the curved fastener. The butterfly laser module assembly structure according to claim 1, wherein the substrate is provided with a light source emitting component of a laser diode, a light detecting diode and a thermistor. The butterfly laser module assembly structure according to claim 1, wherein the laser module is combined with the base shell, and the base housing is provided with a thermoelectric cooler, and then the laser mold is The thermoelectric coolers placed in the base shell are combined by a wire bonding machine to become a complete butterfly laser module. The butterfly laser module assembly structure according to claim 1, wherein the sleeve of the assembled fiber is an elliptical fiber lens. A butterfly laser module assembly method, the steps are as follows:
(a) the substrate with the light source emitting component is corresponding to the curved fastener, and the curved fastener is combined with the substrate by using a tight fitting manner to complete the configuration of the lower component;
(b) placing a fiber-optic jacket (Fiber Ferrule) into the sleeve (Sleeve) to couple with the light source emitting component;
(c) Find the best coupling position, perform laser welding on the sleeve and the sleeve, and complete the configuration of the upper assembly;
(d) Place the upper and lower components of the configuration on the processing machine, and then use the platform on the machine to couple the light, and fix the upper and lower components by laser welding. The butterfly laser module assembly method according to claim 5, wherein the substrate is configured with a light source emitting component of a laser diode, a light detecting diode and a thermistor. The butterfly laser module assembly method according to claim 5, wherein the sleeve of the assembled optical fiber is an elliptical fiber lens. The butterfly laser module assembly method according to claim 5, wherein the sleeve and the sleeve are re-coupled after laser welding of the sleeve and the sleeve. The butterfly laser module assembly method according to claim 5, wherein the upper and lower components are fixed to form a laser module, and the laser module is combined with the base shell. A thermoelectric cooler is arranged in the base shell, and the laser module is placed on the thermoelectric cooler of the base shell to be combined by a wire bonding machine to form a complete butterfly laser module. The butterfly laser module assembly method according to claim 7, wherein the elliptical fiber lens is used for the rotation coupling.