Multi-channel array fiber laser device

Multi-channel array optical fiber laser device

The present invention relates to an optical communication device, especially a multi-channel array optical fiber laser device.

The optical fiber laser device in the prior art generally uses ordinary single mode fiber (Single mode fiber), ground to a certain angle such as 8 degrees, and couples with the laser device and the lens; the coupling efficiency of this design method is in 40~50%, the coupling range at the maximum point is narrow, that is, it is very sensitive to position. A slight movement of about 1 micron (um) will reduce the optical power by more than 3 decibels (dB). This brings great difficulty to the production of optical communication devices, and the requirements for equipment are very high, thereby increasing the investment of equipment; and in products with higher output power requirements, because the coupling efficiency is only less than 50%, Therefore, a higher power output laser device chip is required, and the price of the laser device chip is directly proportional to the output optical power. Therefore, the cost will be greatly increased. Moreover, since the coupling range of ordinary optical fibers is very narrow, with only a coupling range of +/-3um, the laser device array coupling cannot be realized.

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a multi-channel array fiber laser device with relatively high coupling efficiency and capable of realizing the laser device array coupling.

The multi-channel array optical fiber laser device provided by the present invention includes a ferrule, a shell, a plurality of laser device components and an array optical fiber module. These laser device components are arranged side by side in the casing and are arranged on the same module board. Each laser device component includes an optical isolator, a laser device chip and a self-focusing lens. The array optical fiber module has a plurality of thermal diffusion core-type optical fibers collected into the ferrule. The optical isolators of these laser device components are connected to the array optical fiber module.

Therefore, the thermally expanded fiber has a wider input mode field diameter, which is about 2.5 to 3.5 times that of a single-mode fiber. Therefore, the coupling efficiency can be improved, and the range of light coupling can be increased. In addition, the optical isolator can prevent the light reflected by the device from entering the optical fiber, and improve the linearity of the optical-current-voltage (LIV) curve of the optical fiber, so that the laser device has high coupling efficiency while improving the accuracy of the device. The requirements have also been drastically reduced. Therefore, the optical fibers can be arranged in arrays, for example, 4 channels, 8 channels, 10 channels, or 16 channels, etc., thereby greatly reducing the production cost.

In addition, in the multi-channel array fiber laser device provided by the present invention, each laser device component further includes a laser device driving chip, a laser device chip, a monitoring detector and a mirror. Both the monitoring detector and the laser device chip are arranged in front of the front end of the laser device driving chip. The rear end of the laser device chip faces the laser device drive chip. The reflector is arranged between the back end of the laser device chip and the monitoring detector, and is used to reflect the light emitted from the back end of the laser device chip to a receiving surface of the monitoring detector.

Thereby, a small amount of light emitted from the rear end of the laser device chip can be reflected by the mirror to irradiate the receiving surface of the monitoring detector, so the laser device chip can be monitored from the monitoring detector. Moreover, since the monitoring detector and the laser device chip are both arranged in front of the front end of the laser device driving chip instead of on the side of the laser device driving chip, the space occupied by the laser device components on the module board can be reduced, especially It is able to reduce the width occupied by the laser device components, and therefore, when these laser device components are formed into an array structure, the occupied space can be greatly reduced.

In addition, in the multi-channel array fiber laser device provided by the present invention, the self-focusing lens is a cylindrical convex lens with one end surface that is flat or inclined, and the other end surface is convex spherical surface.

With this kind of convex lens, the light guiding effect is better, and it helps to facilitate installation when arranging in the housing.

The above description of the content of this disclosure and the description of the following implementation methods are It is used to demonstrate and explain the spirit and principle of the present model, and to provide a further explanation of the scope of the patent application of the present model.

<p>1Insert</p><p>2Shell</p><p>3Array Fiber Optic Module</p><p>3.1Thermal diffusion core fiber</p><p>4Laser device components</p><p>4.1Laser device driver chip</p><p>4.2Laser device chip</p><p>4.3Mirror</p><p>4.4Monitoring detector</p><p>4.5Self-focusing lens</p><p>4.6Optical isolator</p><p>9Multi-channel array fiber laser device</p>

Fig. 1 is a three-dimensional view of the novel multi-channel array optical fiber laser device; Fig. 2 is a schematic diagram of the internal structure of the housing of the novel multi-channel array optical fiber laser device; Fig. 3 is an enlarged schematic view of A in Fig. 2.

The detailed features and advantages of the new model will be described in detail in the following embodiments. The content is sufficient to enable anyone familiar with the relevant skills to understand the technical content of the new model and implement it accordingly, and based on the content disclosed in this specification, the scope of patent application and the drawings. , Anyone who is familiar with relevant skills can easily understand the purpose and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention by any viewpoint.

As shown in Figure 1, Figure 2, and Figure 3, the present invention provides a multi-channel array laser device 9, which includes a ferrule 1, a housing 2, an array optical fiber module 3 and a plurality of laser device components 4 . The ferrule 1 is used to provide a connection method for connecting to other devices. These laser device components 4 are arranged side by side on the housing 2 and are arranged on the same module board. Each laser device assembly 4 includes an optical isolator 4.6, a laser device chip 4.2 and a self-focusing lens 4.5. The array optical fiber module 3 has a plurality of thermal diffusion core-type optical fibers 3.1 that are collected in the ferrule 1. These laser device components 4 are all connected to the array optical fiber module 3 through these optical isolators 4.6. In a laser device assembly 4, the front end of the laser device chip 4.2 emits the laser and irradiates it to the optical isolator 4.6 through the self-focusing lens 4.5, and then inputs it into the thermal diffusion core fiber 3.1 of the array fiber module 3. .

Since the coupling range of the thermal diffusion core fiber 3.1 is much larger than that of the ordinary single-mode fiber, the thermal diffusion core fiber 3.1 has a lower accuracy requirement when the laser device is coaxially arranged. However, the coupling range is relatively large and it is more susceptible to the influence of external light, so the new The optical isolator 4.6 is added to the multi-channel array laser device 9, which can avoid the influence of external light, improve the coupling efficiency, and reduce the noise. In addition, the above-mentioned design also requires relatively low installation requirements, which helps to install multiple sets of laser device components 4 in an array in the form of an array, which greatly reduces production costs.

In addition, each laser device assembly 4 includes a laser device driver chip 4.1, a laser device chip 4.2, a mirror 4.3 and a monitoring detector 4.4. The laser device chip 4.2 and the monitoring detector 4.4 are both arranged in front of the front end of the laser device driving chip 4.1. The rear end of the laser device chip 4.2 faces the laser device driving chip 4.1. The reflector 4.3 is arranged between the rear end of the laser device chip 4.2 and the monitoring detector 4.4, and is used to reflect the light emitted from the rear end of the laser device chip 4.2 to a receiving surface of the monitoring detector 4.4.

In addition, the self-focusing lens 4.5 is a cylindrical convex lens with one end surface that is flat or inclined with a certain angle, and the other end surface is a convex spherical surface. Since the self-focusing lens 4.5 is cylindrical, it can be set stably by the design of the cylinder itself during installation, so that the self-focusing lens 4.5 is not easy to shake. Therefore, the self-focusing lens 4.5 of the present invention has lower installation requirements than ordinary convex lenses.

Although the present invention is disclosed in the foregoing embodiments as above, it is not intended to limit the present invention. Without departing from the spirit and scope of this model, all changes and modifications made are within the scope of patent protection of this model. For the scope of protection defined by this model, please refer to the attached scope of patent application.