A light emission submodule

Abstract

The present invention relates to the field of optical communication technology, and provides an optical emission submodule, including a laser, and also including a first lens, an optical multiplexer, a second lens, and an optical fiber adapter arranged in sequence along the optical path direction. The laser emitted by the laser passes through the first lens, the optical multiplexer, and the second lens in sequence, and is incident on the optical fiber adapter, and the optical multiplexer is arranged at an angle. The optical path of the present invention is adjusted to an angle a in the horizontal direction obliquely upward, and the vertical translation of the optical path can be achieved without using a displacement prism, thereby eliminating the displacement prism, saving costs, and making the process simpler; eliminating the displacement prism, freeing up the space occupied by the displacement prism, leaving more space for PCBA, and facilitating PCBA wiring and layout of electronic components.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to an optical transmission submodule. Background Art

[0002] With the explosive growth of information, the requirements for communication quality and information quality are getting higher and higher, and optical communication has become an inevitable solution. In the architecture of electro-optical networks, optical modules are the core components that undertake the photoelectric conversion function, so the core demand for optical modules comes from the explosive growth of data traffic.

[0003] At present, the overall market size of optical devices and optical modules exceeds 10 billion US dollars, of which the data communication market (including Ethernet, FC and AOCs) accounts for half. Driven by the continuous development of mobile Internet, cloud computing and AI, the data communication market has become the main downstream scenario of the optical device and optical module industry.

[0004] Figure 1 This is a schematic diagram of the optical path of the optical transmitter of a traditional COB packaged optical module, including PCBA, 4 lasers (a 4-way multiplexed optical module contains 4 lasers), 4 lenses 1 for collimating the light emitted by the laser, an optical multiplexer, a displacement prism for translating the light from the optical multiplexer, a lens 2 for coupling the light from the displacement prism into the optical fiber adapter, and an optical fiber adapter with an isolator. Usually, the electrical connection between the laser and the PCBA is made by gold wire, so the height position of the laser follows the height position of the upper surface of the PCBA. Since there is a height difference between the center of the optical fiber adapter in the height direction and the upper surface of the PCBA, a displacement prism is required between the optical multiplexer and lens 2 to match the height difference between the laser and the optical fiber adapter. Summary of the invention

[0005] An object of the present invention is to provide a light transmitting sub-module which can at least solve some of the defects in the prior art.

[0006] To achieve the above-mentioned purpose, an embodiment of the present invention provides the following technical solution: an optical emission submodule, comprising a laser, and also comprising a first lens, an optical multiplexer, a second lens and an optical fiber adapter arranged in sequence along the optical path direction, the laser emitted by the laser passes through the first lens, the optical multiplexer and the second lens in sequence, and is incident on the optical fiber adapter, the optical multiplexer is arranged at an angle, and the angle between the optical multiplexer and the horizontal line is a, so that the optical path of the laser is adjusted to have an angle with the horizontal direction, and the angle of the angle is a.

[0007] Furthermore, the distance from the laser light outlet to the optical fiber end face of the optical fiber adapter is d, and the height difference between the laser light outlet and the center of the optical fiber of the optical fiber adapter is h, then a=arctg(h / d).

[0008] Furthermore, the angle between the optical multiplexer and the horizontal line is between 1.7 and 4 degrees.

[0009] Furthermore, the light outlet of the laser, the center of the first lens, the center of the second lens, and the center of the fiber core end face of the optical fiber adapter are on a straight line.

[0010] Furthermore, the angle between the incident end face of the optical fiber of the optical fiber adapter and the horizontal line is between 4 and 8 degrees.

[0011] Furthermore, the invention also includes a base for placing the laser, the first lens, the optical multiplexer, the second lens and the optical fiber adapter.

[0012] Furthermore, the base has a first platform, a second platform and a third platform whose heights increase in sequence, and a tilting platform is also provided between the first platform and the second platform. The laser and the first lens are both provided on the first platform, the optical multiplexer is provided on the tilting platform, the second lens is provided on the second platform, and the optical fiber adapter is provided on the third platform.

[0013] Furthermore, it also includes a PCBA board electrically connected to the laser.

[0014] Furthermore, the laser is connected to the PCBA board via a gold wire.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The optical path is adjusted to an angle a in the horizontal direction and can be translated in the vertical direction without using a displacement prism, thus eliminating the need for a displacement prism, saving costs, and making the process simpler.

[0017] The solution of the present invention saves the displacement prism, frees up the space occupied by the displacement prism, leaves more space for PCBA, and facilitates PCBA wiring and layout of electronic components.

[0018] The present invention controls the incident angle a of the convergent light entering the optical fiber by means of the distance d from the laser light outlet to the optical fiber end face of the optical fiber adapter and the height difference h between the laser light outlet and the center of the optical fiber end face of the optical fiber adapter, so that the incident angle a is as close as possible to the optimal incident angle of the convergent light entering the optical fiber adapter, thereby improving the coupling efficiency of the light emitted by the laser into the optical fiber adapter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the optical path of the optical transmitter of a traditional COB packaged optical module;

[0020] Figure 2 A schematic diagram of the optical path of a light emitting sub-module provided in an embodiment of the present invention;

[0021] Figure 3 for Figure 2 Dimensioning diagram of

[0022] Figure 4 A schematic diagram of a light emitting sub-module provided in an embodiment of the present invention being arranged on a base;

[0023] Figure 5 A schematic diagram of a base provided by an embodiment of the present invention;

[0024] In the accompanying drawings: 1-PCBA board; 2-laser; 3-first lens; 4-optical multiplexer; 5-second lens; 6-optical fiber adapter; 7-base; 8-first platform; 9-second platform; 10-third platform; 11-tilt table. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 2 , Figure 3 , Figure 4 and Figure 5, an embodiment of the present invention provides an optical emission submodule, comprising a laser 2, and also comprising a first lens 3, an optical multiplexer 4, a second lens 5 and an optical fiber adapter 6 arranged in sequence along the optical path direction, the laser emitted by the laser 2 passes through the first lens 3, the optical multiplexer 4 and the second lens 5 in sequence, and is incident on the optical fiber adapter 6, and the optical multiplexer 4 is arranged at an angle. Preferably, the angle between the optical multiplexer 4 and the horizontal line is a, the distance from the light outlet of the laser 2 to the optical fiber end face of the optical fiber adapter 6 is d, and the height difference between the light outlet of the laser 2 and the center of the optical fiber of the optical fiber adapter 6 is h, then a=arctg (h / d). In this embodiment, the optical path is adjusted from the horizontal direction to an angle a obliquely upward, and the vertical translation of the optical path can be achieved without using a displacement prism, which saves the displacement prism, saves costs, and also makes the process simpler. Specifically, the optical path of the traditional optical emission submodule requires a displacement prism to match the height difference between the laser and the optical fiber adapter, which has the following problems: 1. The need to use a displacement prism increases the cost of the product; 2. The need to use a displacement prism takes up space. The space for the optical path layout is increased, thereby correspondingly reducing the space for PCBA layout circuits and electronic components, resulting in space constraints for the PCBA. In order to solve this problem, the present embodiment cleverly solves the problem by sticking the optical multiplexer 4 at an angle. Preferably, the angle between the optical multiplexer 4 and the horizontal line is between 1.7 and 4 degrees. Figure 3 As shown, the distance from the laser 2 light outlet to the fiber end face of the fiber adapter 6 is set to d, the height difference between the laser 2 light outlet and the fiber center of the fiber adapter 6 is h, and the tilt angle of the optical multiplexer 4 is a. Angle a = arctg (h / d), assuming h = 0.7mm, d = 14mm, then a = arctg (0.7 / 14) = 2.86 degrees. In practical applications, in order to reduce the impact of light reflection on the laser 2, the incident end face of the fiber adapter 6 is usually ground to a 6-degree angle, and the optimal incident angle of the fiber end face light at a 6-degree angle is about 2.8 degrees. The angle a of 2.86 calculated above just matches the optimal incident angle of light. The light outlet of the laser 2, the center of the first lens 3, the center of the second lens 5, and the center of the fiber core end face of the fiber adapter 6 are on a straight line.

[0027] Preferably, the value of h is usually about 0.7 mm, and the angle of a needs to match the optimal incident angle of light entering the optical fiber adapter 6. For example, when a 6-degree bevel optical fiber adapter 6 is used, the optimal incident angle of light is about 2.8 degrees. Figure 3 As shown, the high point of the optical fiber adapter 6 ( Figure 3 Point A marked on the left) facing downward.

[0028] See also Figures 2 to 5, the optical emission submodule also includes a base 7 for placing the laser 2, the first lens 3, the optical multiplexer 4, the second lens 5 and the optical fiber adapter 6. In this embodiment, the base 7 can be used for pasting various components. Preferably, the base 7 has a first platform 8, a second platform 9 and a third platform 10 whose height positions increase in sequence, and a tilting platform 11 is also provided between the first platform 8 and the second platform 9. The laser 2 and the first lens 3 are both provided on the first platform 8, the optical multiplexer 4 is provided on the tilting platform 11, the second lens 5 is provided on the second platform 9, and the optical fiber adapter 6 is provided on the third platform 10. By designing the platform and the tilting platform 11, it is only necessary to design the height position of each platform and the tilting angle of the tilting platform 11, so that the coupling of the optical emission submodule can be completed very efficiently. The tilting angle of the tilting platform 11 is a, so that the optical multiplexer 4 with a tilting angle of a can be obtained. Preferably, it also includes a PCBA board 1 electrically connected to the laser 2, and the laser 2 is connected to the PCBA board 1 through a gold wire.

[0029] Example 1: Taking 100G CWDM4 product as an example, design Figure 3 As shown, h=0.7mm, d=14mm, the tilt angle of the optical multiplexer 4 is a=arctg(0.7 / 14)=2.86 degrees, and the fiber end face tilt angle of the optical fiber adapter 6 is 6 degrees (the best incident angle is about 2.8 degrees). The specific implementation steps are as follows: 1. Connect the laser 2, the optical multiplexer 4 (according to Figure 4 The direction shown, a = 2.86 degrees is attached to the substrate of the light emitting end) and the optical fiber adapter 6 (the high point A of the optical fiber adapter 6 is in accordance with Figure 3 1. Fix the laser 2 to the PCBA by gold wire bonding; 2. Power on the product and complete the coupling of each lens in turn.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A light emitting submodule, comprising a laser, characterized in that: The optical module further comprises a first lens, an optical multiplexer, a second lens and an optical fiber adapter which are sequentially arranged along the optical path direction. The laser emitted by the laser passes through the first lens, the optical multiplexer and the second lens in sequence and is incident on the optical fiber adapter. The optical multiplexer is tilted and the angle between the optical multiplexer and the horizontal line is a, so that the optical path of the laser is adjusted to have an angle with the horizontal direction, and the angle of the angle is a. The optical emission submodule further comprises a base for placing the laser, the first lens, the optical multiplexer, the second lens and the optical fiber adapter. The base has a first platform, a second platform and a third platform with increasing height positions in sequence. A tilting platform is also arranged between the first platform and the second platform. The laser and the first lens are both arranged on the first platform, the optical multiplexer is arranged on the tilting platform, the second lens is arranged on the second platform, and the optical fiber adapter is arranged on the third platform.

2. The optical transmission submodule according to claim 1, wherein: The distance from the laser light outlet to the optical fiber end face of the optical fiber adapter is d, and the height difference between the laser light outlet and the center of the optical fiber of the optical fiber adapter is h, then a=arctg(h / d).

3. The light emitting submodule according to claim 1, wherein: The angle a between the optical multiplexer and the horizontal line is between 1.7 and 4 degrees.

4. The light emitting submodule according to claim 1, wherein: The light outlet of the laser, the center of the first lens, the center of the second lens, and the center of the fiber core end face of the optical fiber adapter are on a straight line.

5. The light emitting submodule according to claim 1, wherein: The angle between the incident end face of the optical fiber of the optical fiber adapter and the horizontal line is between 4 and 8 degrees.

6. The light emitting submodule as claimed in claim 1, characterized in that: Also included is a PCBA board electrically connected to the laser.

7. The light emitting submodule as claimed in claim 6, characterized in that: The laser is connected to the PCBA board via a gold wire.

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