Lens optical fiber array assembly, light emitting device and light receiving device

Abstract

The utility model discloses a lens optical fiber array assembly, a light emitting device and a light receiving device, lenses and an optical fiber array are made into a whole by adopting a glass material, and light rays are subjected to shaping, total reflection and convergence through the design of two groups of array lenses and a reflection inclined plane so as to realize the transmission of optical data. The coupling efficiency of the light emitting end and the light receiving end is improved; meanwhile, as the thermal expansion coefficient of a glass material is small, the problem that the optical power is unstable at a wide temperature due to the fact that the thermal expansion coefficient of a plastic lens is too high is avoided, and the technical effects of miniaturization of an optical path and improvement of the stability of the optical power in a wide temperature zone are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of data communication, and in particular relates to a high-speed miniaturized lens optical fiber array component, a light emitting device and a light receiving device. Background Art

[0002] With the promotion and in-depth application of optical communication products in 4G, 5G and cloud services, the demand for parallel optoelectronic conversion modules is increasing day by day, and the market demand is also developing in the direction of continuous miniaturization, high speed, high density, wide temperature range and low power consumption.

[0003] Currently, the optical path of high-speed parallel optoelectronic modules in the market is basically realized by molded plastic parts, but jumpers or MT ferrules are generally needed to switch the optical path, and the overall size of the optical path is relatively large. In addition, since the CTE (coefficient of thermal expansion) of the plastic lens itself is relatively high, it will cause large changes in high and low temperature optical power when used in wide temperature range modules. Summary of the invention

[0004] The purpose of the utility model is to provide a lens optical fiber array assembly made of glass material in one piece, designing the lens and the optical fiber array into a new whole, both using glass material with a small CTE, realizing the miniaturization of the optical path while improving the stability of the optical power in a wide temperature range.

[0005] The utility model is implemented by the following technical solutions:

[0006] A lens fiber array assembly is provided, comprising:

[0007] A special-shaped lens body (2) made of glass is etched on its top surface to form a V-groove (24), its bottom surface is in an inverted step shape, and one side surface is in a reflective inclined surface (23); a first array lens group (21) is etched at a position where the reflective inclined surface (23) and the V-groove (24) meet, the first array lens group (21) being composed of a plurality of first lenses, one first lens corresponding to one V-groove (24); a second array lens group (22) is etched at a high-order region (25) of the inverted step-shaped bottom surface, the second array lens group (22) being composed of a plurality of second lenses, and each second lens is on the same optical path as a first lens of the first array lens group (21) in the vertical direction;

[0008] An optical fiber array (4) arranged in the V-groove (24);

[0009] A glass cover plate (1) covers the optical fiber array (4).

[0010] In some embodiments of the utility model, the angle between the reflecting inclined surface (23) and the horizontal plane is 45°.

[0011] In some embodiments of the present invention, a film is applied to the reflective inclined surface (23).

[0012] Compared with the prior art, the advantages and positive effects of the present invention are as follows: the lens optical fiber array assembly proposed in the present invention adopts a glass material with a small thermal expansion coefficient to design the lens and the optical fiber array into a new whole, thereby reducing the reliability risk brought by the adhesive optical assembly, realizing the miniaturization of the optical path and improving the stability of the optical power in a wide temperature range.

[0013] Furthermore, compared with the existing situation where the coating cost is relatively high in some areas of the lens product, under the structure of the present invention, the reflective bevel surface can be coated to increase the reflection of the light path, and the optical fiber of some channels can be ground at different angles to meet the requirements of reducing power, which can reduce costs, simplify processes, and reduce lens pollution caused by coating.

[0014] A light emitting device is provided, comprising:

[0015] A lens fiber array assembly as described above;

[0016] A laser (5), whose optical port position is aligned with the second array lens (22) of the lens optical fiber array assembly through active coupling;

[0017] The transmitting electrical chip (7) is electrically connected to the laser (5).

[0018] A light receiving device is provided, comprising:

[0019] A lens fiber array assembly as described above;

[0020] The photoelectric conversion chip (3) has its optical port position aligned with the second array lens (22) of the lens optical fiber array assembly through active coupling;

[0021] The receiving electrical chip (6) is electrically connected to the photoelectric conversion chip (3).

[0022] Compared with the prior art, the advantages and positive effects of the utility model are as follows: in the optical emitting device proposed by the utility model, the light emitted by the laser can be shaped by the second array lens before entering the optical fiber, which can improve the coupling efficiency of the laser, and at the same time can take into account lasers with different divergence angles, and has strong compatibility; in the optical receiving device, the light output from the optical fiber is shaped by the first array lens and totally reflected by the reflecting slope, and the light spot is then converged and integrated by the second array lens, and the diameter becomes smaller, which can match the size of the photosensitive area of ​​the photoelectric conversion chip after the reduction, thereby increasing the coupling margin and coupling efficiency. During this period, the reflection of the reflective surface increases, which can also improve the coupling efficiency, thereby solving the problem of reduced coupling efficiency caused by the reduction of the photosensitive area of ​​the photoelectric conversion chip as the rate increases, and improving the coupling efficiency of the receiving end.

[0023] After reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For those skilled in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the lens optical fiber array assembly proposed in the utility model;

[0026] Figure 2 This is a schematic diagram of the emission light path of the lens fiber array assembly proposed in the utility model;

[0027] Figure 3 This is a schematic diagram of the receiving optical path of the lens optical fiber array assembly proposed in the utility model;

[0028] Figure 4 This is an optical simulation diagram of the lens fiber array assembly proposed in the utility model;

[0029] Figure 5 The top structure of the special-shaped lens body in the utility model is schematically shown;

[0030] Figure 6 The bottom structure of the special-shaped lens body in the utility model is schematically shown;

[0031] Figure 7 The top structure diagram of the lens optical fiber array assembly proposed by the utility model;

[0032] Figure 8 This is a schematic diagram of the bottom structure of the lens optical fiber array assembly proposed in the utility model;

[0033] Fig. 9 The structure of the light emitting device proposed in the utility model and the schematic diagram of its light path;

[0034] Fig.10 The structure of the optical receiving device proposed in the utility model and the schematic diagram of its optical path;

[0035] Figure numerals: 1-glass cover plate, 2-special-shaped lens body, 21-first array lens, 22-second array lens, 23-reflection slope, 24-V groove, 25-high-order area, 3-photoelectric conversion chip, 4-optical fiber array, 5-laser, 6-receiving electrical chip, 7-transmitting electrical chip.

[0036] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The lens optical fiber array assembly proposed by the utility model is as follows: Figure 1 , Figures 5 to 8 As shown, including:

[0041] A special-shaped lens body 2 made of glass is etched on its top surface to form a V-groove 24, its bottom surface is in an inverted step shape, and one side surface is a reflective slope 23; a first array lens group 21 is etched at a position where the reflective slope 23 and the V-groove 24 meet, and the first array lens group 21 consists of a plurality of first lenses, and one first lens corresponds to one V-groove 24; a second array lens group 22 is etched in a high-order region 25 of the inverted step-shaped bottom surface, and the second array lens group 22 consists of a plurality of second lenses, and each second lens is on the same optical path as a first lens of the first array lens group 21 in the vertical direction.

[0042] The optical fiber array 4 is arranged in the V-groove 24 .

[0043] The glass cover plate 1 covers the optical fiber array 4.

[0044] In order to realize the integration of lens and optical fiber array assembly, the utility model adopts the structural design of special-shaped lens main body 2, etches the first array lens 21 and the second array lens 22 by photolithography or other methods to achieve the required surface shape, grinds or laser cuts them into the required shape, accurately locates the position of V-groove 24 and the position of the first / second array lens 21 / 22 by tooling die, etches the pre-angle of V-groove 24, then accurately grinds the required angle of V-groove 24 according to the diameter of optical fiber, arranges optical fiber array 4, and finally fixes them with glue, and protects and reinforces the upper layer with glass cover plate 1.

[0045] In terms of optical path design, Figures 2 to 4 As shown, one end of the V-groove 24 is opposite to the reflective bevel 23, the first array lens 21 is designed on the inner side of the reflective bevel 23 and opposite to the V-groove 24, and the second array lens 22 is designed on the total reflection optical path of the reflective bevel 23 opposite to the first array lens, so that when one of the first array lens 21 and the second array lens 22 realizes the shaping function, the other realizes the focusing function. When the lens fiber array assembly is applied on the emission optical path, as shown in FIG. Figure 2 As shown, the emitted light is shaped by the second array lens 22 and then totally reflected on the reflective slope 23. After being focused by the first array lens 21, the numerical aperture of the light beam reaching the optical fiber array 4 meets the numerical aperture requirement of the optical fiber, thereby performing data transmission. When the lens optical fiber array is applied to the receiving optical path, as shown in FIG. Figure 3 As shown, the received light transmitted from the optical fiber array 4 is shaped by the first array lens 21 and then totally reflected on the reflective slope 23. After being converged by the second array lens, the light beam reaches the optical receiver, thereby realizing data reception.

[0046] The utility model optimizes the coupling efficiency of conventional optical fiber components through the above-mentioned structural design combined with the design of the optical path. At the same time, the lens and the optical fiber array component are integrated as a whole, which improves the reliability of the adhesive product. For the plastic lens of the structural adhesive, the CTE variation is smaller, the size can be customized at will, and the cost is low.

[0047] In the embodiment of the utility model, the reflective bevel 23 is designed with a 45° tilt angle to achieve total reflection of light. Under this angle design, the surface of the reflective bevel 23 can be coated to increase the reflection of the light path. Since the coating cost of some areas of the lens product is relatively high and there is a lens pollution problem caused by the coating, the technology of coating the reflective bevel 23 of the utility model can reduce costs, simplify processes and reduce lens pollution problems caused by coating, and the optical fibers of some channels can be ground at different angles to meet the requirements of reducing power.

[0048] like Fig. 9 and Fig.10As shown, the utility model combines the lens optical fiber array assembly proposed above and applies it to a light emitting device and a light receiving device.

[0049] like Fig. 9 As shown, in the light emitting device, the light emitted by the laser 5 is shaped by the second array lens 22 and then totally reflected by the reflecting bevel 23, and then converged by the first array lens 21 into the optical fiber array 4, which can improve the coupling efficiency of the laser 5 and can take into account lasers with different divergence angles, and has strong compatibility.

[0050] like Fig.10 As shown, in the optical receiving device, the light output from the optical fiber array 4 is shaped by the first array lens 21 and then totally reflected by the reflective bevel 23, and then converged by the second array lens 22 to enter the photoelectric conversion chip 3. This can solve the problem of reduced coupling efficiency caused by the reduction of the photosensitive area of ​​the photoelectric conversion chip as the rate increases, and improve the coupling efficiency of the receiving end.

[0051] It should be pointed out that the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A lens fiber array assembly, characterized in that: include: A special-shaped lens body (2) made of glass is etched on its top surface to form a V-groove (24), its bottom surface is in an inverted step shape, and one side surface is in a reflective inclined surface (23); a first array lens group (21) is etched at a position where the reflective inclined surface (23) and the V-groove (24) meet, the first array lens group (21) being composed of a plurality of first lenses, one first lens corresponding to one V-groove (24); a second array lens (22) is etched at a high-order region (25) of the inverted step-shaped bottom surface, the second array lens (22) being composed of a plurality of second lenses, and each second lens being on the same optical path as a first lens of the first array lens group (21) in the vertical direction; An optical fiber array (4) arranged in the V-groove (24); A glass cover plate (1) covers the optical fiber array (4).

2. The lens fiber array assembly according to claim 1, characterized in that: The reflection slope (23) is at an angle of 45° to the horizontal plane.

3. The lens fiber array assembly according to claim 1, characterized in that: The reflective bevel (23) is coated.

4. A light emitting device, characterized in that: include: The lens fiber array assembly according to any one of claims 1 to 3; A laser (5), whose optical port position is aligned with the second array lens (22) of the lens optical fiber array assembly through active coupling; The transmitting electrical chip (7) is electrically connected to the laser (5).

5. A light receiving device, characterized in that: include: The lens fiber array assembly according to any one of claims 1 to 3; The photoelectric conversion chip (3) has its optical port position aligned with the second array lens (22) of the lens optical fiber array assembly through active coupling; The receiving electrical chip (6) is electrically connected to the photoelectric conversion chip (3).

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