A vertical cavity surface emitting laser fiber coupling component

Abstract

The present invention relates to the field of optical communication, and in particular to a vertical cavity surface emitting laser fiber coupling assembly, comprising a lens assembly and a vertical cavity surface emitting laser, wherein the position of the lens assembly relative to the vertical cavity surface emitting laser when the coupling power is maximum is taken as the reference lens assembly position, wherein the lens assembly is arranged 20 to 70 μm above or 40 to 60 μm below the reference lens assembly position. By changing the positional relationship between the lens assembly and the vertical cavity surface emitting laser, the vertical cavity surface emitting laser is slightly misaligned with the optical path coupling position, so that the vertical cavity surface emitting laser can maintain a relatively stable output under the condition of maintaining a relatively high coupling power, thereby obtaining a higher signal quality.

Description

Technical Field

[0001] The invention relates to the field of optical communications, and in particular to a vertical cavity surface emitting laser optical fiber coupling component. Background Art

[0002] Optical fiber is the transmission channel of the optical fiber communication system. Its main function is to guide light to propagate along a certain path inside it. In the optical fiber communication system, the output light of the vertical cavity surface emitting laser (VCSEL) is circular and has a small divergence angle, which is very conducive to coupling with the optical fiber.

[0003] In the prior art, the lens assembly containing the optical fiber is in the best coupling position with the vertical cavity surface emitting laser, that is, at the position with the maximum optical power. After the laser emitted by the vertical cavity surface emitting laser passes through the lens group, there will be different degrees of reflection, which means that the best coupling position will cause instability in the laser output, and even directly lead to the degradation of the transmitter signal and poor signal quality. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a vertical cavity surface emitting laser fiber coupling assembly in view of the above-mentioned defects of the prior art, so as to overcome the defects of unstable output of the emitting laser and poor signal quality in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problem is: to provide a vertical cavity surface emitting laser fiber coupling component, including a lens component and a vertical cavity surface emitting laser, with the position of the lens component relative to the vertical cavity surface emitting laser when the coupling power is maximum as the reference lens component position, and the lens component is arranged 20 to 70 μm above or 40 to 60 μm below the reference lens component position.

[0006] A further preferred embodiment of the present invention is that the wavelength of the vertical cavity surface emitting laser is 840-860 nm.

[0007] A further preferred solution of the present invention is that the lens assembly is arranged 50 μm below the reference lens assembly.

[0008] A further preferred solution of the present invention is that the lens assembly is arranged 70 μm above the reference lens assembly.

[0009] A further preferred embodiment of the present invention is: it also includes: an optical fiber, and a printed circuit board assembly electrically connected to the vertical cavity surface emitting laser; the vertical cavity surface emitting laser is arranged under the lens assembly for emitting laser, and the lens assembly is used to collect and reflect laser onto the optical fiber.

[0010] A further preferred solution of the present invention is that the printed circuit board assembly is assembled below the vertical cavity surface emitting laser through silver glue.

[0011] The beneficial effect of the present invention is that by changing the positional relationship between the lens assembly and the vertical cavity surface emitting laser, the vertical cavity surface emitting laser is slightly misaligned with the optical path coupling position, so that the vertical cavity surface emitting laser can maintain a relatively stable output while maintaining a relatively high coupling power, thereby obtaining a higher signal quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0013] Figure 1 It is a schematic diagram of the structure of the fiber coupling assembly of the vertical cavity surface emitting laser of the present invention;

[0014] Figure 2 It is a schematic diagram of the relationship between the moving distance, signal quality and power of the present invention. DETAILED DESCRIPTION

[0015] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0016] As attached Figure 1 , 2 As shown, a vertical cavity surface emitting laser fiber coupling assembly is provided, including a lens assembly and a vertical cavity surface emitting laser 2. The position of the lens assembly relative to the vertical cavity surface emitting laser 2 when the coupling power is maximum is taken as the reference lens assembly position, and the lens assembly is arranged 20 to 70 μm above or 40 to 60 μm below the reference lens assembly position. By changing the position of the vertical cavity surface emitting laser and the lens assembly, the vertical cavity surface emitting laser is slightly misaligned with the optical path coupling position, so that the vertical cavity surface emitting laser can maintain a relatively stable output under the condition of maintaining a relatively high coupling power, thereby obtaining a higher signal quality.

[0017] In the present invention, the wavelength of the vertical cavity surface emitting laser is 840-860nm, mainly concentrated in the 850nm band. Figure 2 , the attached Figure 2 The horizontal axis is the moving distance (μm) of the lens assembly relative to the reference lens assembly, and the vertical axis on the left is the eye opening (%). The larger the eye opening, the better the signal quality, and its linear relationship with the moving distance is: Figure 2 The horizontal axis on the right is the coupling power (mW) measured by 50 microfarad multimode optical fiber, and its linear relationship with the moving distance is: Figure 2The coupling power between the lens assembly and the vertical cavity surface emitting laser 2 is measured by a power meter. The position of the lens assembly relative to the vertical cavity surface emitting laser 2 when the coupling power is maximum is the reference lens assembly position, that is, Figure 2 The horizontal coordinate "0" is in the middle. However, due to the reflection on the lens surface, the signal is unstable at the reference lens assembly position. Preferably, the lens assembly is set 70 μm above or 50 μm below the reference lens assembly position. When the lens assembly is set 50 μm below the reference lens assembly position, the obtained eye diagram margin is the largest and the signal quality is better.

[0018] Combined with Figure 1 In the present invention, the vertical cavity surface emitting laser fiber coupling assembly also includes an optical fiber 5 and a printed circuit board assembly 1 electrically connected to the vertical cavity surface emitting laser 2; the vertical cavity surface emitting laser 2 is arranged under the lens assembly for emitting laser, and the lens assembly is used to collect and reflect laser light onto the optical fiber 5.

[0019] The lens assembly includes a first lens 31 and a prism 4. The first lens 31 is arranged on the first mounting plate 3 and is used to converge the laser emitted by the vertical cavity surface emitting laser 2. The prism 4 includes a reflecting surface 41 and a second lens 42. The light is reflected onto the optical fiber 5 through the reflection of the reflecting surface 41 and the action of the second lens 42.

[0020] Furthermore, the printed circuit board assembly 1 is assembled below the vertical cavity surface emitting laser 2 through silver glue.

[0021] It should be noted that the terms "above", "below" and similar expressions used herein are based on the fact that the VCSEL 2 is disposed below the lens assembly for the purpose of illustration and are not the only implementation method. In the present invention, the optical fiber and the lens assembly move together.

[0022] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0023] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A vertical cavity surface emitting laser fiber coupling assembly, comprising a lens assembly, a vertical cavity surface emitting laser and an optical fiber, wherein the position of the lens assembly relative to the vertical cavity surface emitting laser when the coupling power is maximum is used as the reference lens assembly position, characterized in that: The lens assembly is arranged 20 to 70 μm above or 40 to 60 μm below the position of the reference lens assembly, wherein the lens assembly includes a first lens and a prism, the prism is located on a side of the first lens away from the vertical cavity surface emitting laser, the first lens is used to collect laser light onto the prism, and the prism is used to reflect laser light onto the optical fiber.

2. The cavity surface emitting laser fiber coupling assembly according to claim 1, characterized in that: The wavelength of the vertical cavity surface emitting laser is 840-860nm.

3. The vertical cavity surface emitting laser fiber coupling assembly according to claim 2, characterized in that: The lens assembly is disposed 50 μm below the reference lens assembly.

4. The vertical cavity surface emitting laser fiber coupling assembly according to claim 2, characterized in that: The lens assembly is disposed 70 μm above the reference lens assembly.

5. The vertical cavity surface emitting laser fiber coupling assembly according to claim 3 or 4, characterized in that: It also includes: a printed circuit board assembly electrically connected to the vertical cavity surface emitting laser; the vertical cavity surface emitting laser is arranged under the lens assembly for emitting laser, and the lens assembly is used to collect and reflect the laser onto the optical fiber.

6. The vertical cavity surface emitting laser fiber coupling assembly according to claim 5, characterized in that: The printed circuit board assembly is assembled below the vertical cavity surface emitting laser through silver glue.

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