Optical receptacles and optical modules

Abstract

To provide an optical receptacle with a large misalignment tolerance. [Solution] The optical receptacle of the present invention has a convex first optical surface and a convex second optical surface. The shape of the first optical surface is formed by the superposition of a first aspherical component, a helical component, and a cone component. If we assume that a virtual first optical surface, which does not contain a helical component but contains a first aspherical component and a cone component, is placed in place of the first optical surface, and that light emitted from a photoelectric conversion element is incident on the virtual first optical surface, then the first aspherical component and the cone component are set such that, in a cross section including the central axis of the virtual first optical surface, the angle of the light ray incident on the virtual first optical surface at the position furthest from the central axis of the virtual first optical surface after it has been incident on the virtual first optical surface is within 0.5°.

Description

Technical Field

[0001] The present invention relates to an optical receptor and an optical module.

Background Art

[0002] In recent years, in order to transmit and receive a large amount of data at high speed using optical communication, a communication device and a communication system including a photoelectric conversion element, an optical receptor, and an optical fiber have been used. In such optical communication, the light emitted from the photoelectric conversion element enters the optical fiber through the optical receptor. Further, among the light reaching the end face of the optical fiber, the light reflected at the end face without entering reaches the photoelectric conversion element through the optical receptor as return light. The return light reaching the photoelectric conversion element makes the operation of the photoelectric conversion element unstable. As a means for improving this problem, it has been proposed to use an optical receptor having an optical lens including a conical component, a spiral component, and a cone component (see, for example, Patent Document 1).

[0003] Patent Document 1 describes an optical coupler (optical receptor) having an optical lens including an optical surface combining a conical component, a spiral component, and a cone component, and a housing. The optical coupler described in Patent Document 1 is disposed between a laser light source (photoelectric conversion element) and an optical fiber and optically connects the laser light source and the optical fiber.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the optical lens of the optical coupler described in Patent Document 1, because it contains a cone component, the diameter of the light emitted from the laser light source, incident on the optical surface, and then traveling through the optical lens may gradually increase. Furthermore, in the optical coupler of Patent Document 1, the gradual increase in the diameter of the light traveling through the optical lens may reduce the misalignment tolerance of the laser light source relative to the optical lens. Thus, the optical coupler described in Patent Document 1 requires further consideration from the perspective of misalignment tolerance of the photoelectric conversion element.

[0006] The object of the present invention is to provide an optical receptacle with a large tolerance for misalignment of the photoelectric conversion element relative to the optical receptacle, and an optical module having said optical receptacle. [Means for solving the problem]

[0007] The present invention relates to the following optical receptacles and optical modules. [1] An optical receptacle for optically coupling the end faces of a photoelectric conversion element and an optical transmission body when placed between the photoelectric conversion element and the optical transmission body, the optical receptacle having a first convex optical surface for allowing light emitted from the photoelectric conversion element to be incident on, or for allowing light emitted from the end face of the optical transmission body and passing through the interior of the optical receptacle to be emitted toward the photoelectric conversion element, and a second convex optical surface for allowing light incident on the first optical surface to be emitted toward the end face of the optical transmission body, or for allowing light emitted from the end face of the optical transmission body to be incident on, wherein the shape of the first optical surface has a first aspherical component, An optical receptacle in which a virtual first optical surface is formed by the superposition of a helical component and a cone component, and which does not include the helical component but includes the first aspherical component and the cone component, is placed in place of the first optical surface, and assuming that light emitted from the photoelectric conversion element is incident on the virtual first optical surface, the first aspherical component and the cone component are set such that, in a cross section including the central axis of the virtual first optical surface, the angle of the light ray incident on the virtual first optical surface at the position furthest from the central axis of the virtual first optical surface after it has been incident on the virtual first optical surface is within 0.5°. [2] The optical receptacle according to [1], wherein the shape of the second optical surface includes a second aspherical component, and the second aspherical component is set such that the optical diameter of the light emitted from the second optical surface at the end face of the optical transmitter is 30 μm or less. [3] The optical receptacle according to [1] or [2], further comprising a reflective surface for reflecting light incident on the first optical surface toward the second optical surface, or for reflecting light incident on the second optical surface toward the first optical surface. [4] An optical module comprising a photoelectric conversion element, an optical transmission body, and an optical receptacle according to any one of [1] to [3] disposed between the photoelectric conversion element and the optical transmission body. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an optical receptacle with a large tolerance for misalignment of the photoelectric conversion element relative to the optical receptacle, and an optical module having said optical receptacle. [Brief explanation of the drawing]

[0009] [Figure 1] Figures 1A and 1B show the configuration of the optical module according to this embodiment. [Figure 2] Figures 2A to 2D show the configuration of the first optical surface. [Figure 3] Figure 3 shows the spot of reflected light on the light-emitting surface of the photoelectric conversion element. [Figure 4] Figures 4A and 4B show the relationship between the amount of movement of the photoelectric conversion element and the coupling efficiency. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0011] (Configuration of the optical module) Figure 1A is a diagram showing the configuration of an optical module 100 according to one embodiment of the present invention, and Figure 1B is a diagram for explaining the angle θ with respect to the first central axis CA1 after a light ray incident at the position furthest from the first central axis CA1 is incident on the virtual first optical surface.

[0012] As shown in Figure 1A, the optical module 100 according to this embodiment includes a photoelectric conversion element 200, an optical transmission body 300, and an optical receptacle 400. In the optical module 100, the photoelectric conversion element 200 and the optical transmission body 300 are optically coupled by the optical receptacle 400.

[0013] The optical module 100 may be either a transmitting optical module or a receiving optical module. When the optical module 100 is a transmitting optical module, the optical receptacle 400 guides the light emitted from the photoelectric conversion element 200 to the end face of the optical transmission body 300. On the other hand, when the optical module 100 is a receiving optical module, the optical receptacle 400 guides the light emitted from the end face of the optical transmission body 300 to the photoelectric conversion element 200. The optical module 100 of this embodiment is particularly effective when used as a transmitting optical module.

[0014] If the optical module 100 is a transmitting optical module, the photoelectric conversion element 200 is a light-emitting element. The light-emitting element has a light-emitting surface and is a light source that emits light that reaches the end face of the optical transmission body 300. Examples of light-emitting elements include lasers. Examples of lasers include vertical-cavity surface-emitting lasers (VCSELs), distributed feedback (DFB) lasers, electro-absorption modulated lasers (EMLs), and Fabry-Perot lasers. Also, reflected light from the end face of the optical transmission body 300 returns to the light-emitting surface. The diameter of the light-emitting surface is not particularly limited. In this embodiment, the laser emission diameter of the light-emitting surface is usually in the range of 5 to 10 μm. Among lasers, the emission diameter of a VCSEL is usually in the range of 7 to 9 μm. The distribution of emission intensity of the light emitted from the light-emitting element in a cross-section including the optical axis of the light-emitting element may be a unimodal distribution or a bimodal distribution. When viewed along the optical axis, the bimodal distribution of emission intensity has a peak (ridge) of high light intensity in the peripheral area, and the light intensity in the central area is lower than in the peripheral area. In this embodiment, the distribution of emission intensity of light emitted from the light-emitting element in a cross-section including the optical axis of the light-emitting element is a bimodal distribution.

[0015] If the optical module 100 is a receiving optical module, the photoelectric conversion element 200 is a light-receiving element. The light-receiving element has a light-receiving surface and receives light emitted from the optical transmission body 300. The light-receiving element 115 is, for example, a photodetector.

[0016] The optical transmission body 300 receives the light emitted from the photoelectric conversion element (light emitting element) 200 or emits light toward the photoelectric conversion element (light receiving element) 200. The type of the optical transmission body 300 is not particularly limited. Examples of the type of the optical transmission body 300 include an optical fiber and an optical waveguide. In the present embodiment, the optical transmission body 300 is an optical fiber. The optical fiber may be a single-mode fiber or a multi-mode fiber. In the present embodiment, the optical fiber is a multi-mode fiber. The core diameter of the multi-mode fiber is, for example, 50 μm or 62.5 μm.

[0017] The optical receptacle 400 is disposed between the photoelectric conversion element 200 and the optical transmission body 300 and optically couples the photoelectric conversion element 200 and the optical transmission body 300. The optical receptacle 400 is preferably formed using a material having translucency with respect to light having a wavelength used for optical communication. Examples of the material of the optical receptacle 400 include transparent resins such as polyether imide (PEI) and cyclic olefin resin. Further, the optical receptacle 400 is manufactured, for example, by injection molding.

[0018] The optical receptacle 400 has a first optical surface 410, a reflective surface 420, and a second optical surface 430.

[0019] The first optical surface 410 is a convex surface for causing the light emitted from the photoelectric conversion element 200 to enter the photoreceptor 400, or a convex surface for causing the light emitted from the end face of the optical transmission body 300 and passing through the inside of the photoreceptor 400 to be emitted toward the photoelectric conversion element 200. In the present embodiment, since the optical module 100 is a transmission optical module, the first optical surface 410 is arranged to face the photoelectric conversion element 200 so that the light emitted from the photoelectric conversion element (light emitting element) 200 enters the photoreceptor 400. It is preferable that the first central axis CA1 of the first optical surface 410 coincides with the central axis of the light emitting surface of the photoelectric conversion element 200. In the present embodiment, the light emitted from the photoelectric conversion element 200 becomes vortex light having a ring-shaped intensity distribution by passing through the first optical surface 410. The shape of the first optical surface 410 is formed by the superposition of a first aspherical component, a spiral component, and a cone component (the shape of the first optical surface 410 is a shape representing the geometric combination of the first aspherical component, the spiral component, and the cone component described later).

[0020] "The first aspherical component Z" is represented by the following formula (1).

[0021]

Number

[0022] In the above formula (1), c is the curvature (the reciprocal of the radius of curvature), k is the conic coefficient (conic coefficient), r is the distance from the optical axis (the central axis of the first optical surface 410), and α1 to α8 mean the aspherical coefficients of the correction polynomial.

[0023] "The cone component Z C " is represented by the following formula (2).

[0024]

Number

[0025] In equation (2) above, θ1 is the angle between a line perpendicular to the first central axis CA1 and a virtual plane containing only the cone component in a cross-section including the first central axis CA1. θ1 is an angle in the range of 0 to 90°, and r is the distance from the optical axis (the central axis of the first optical surface 410). In this embodiment, θ1 is 2°.

[0026] "Spiral component Z B The helical component Z is given by the following equation (3): B This converts the light emitted from the photoelectric conversion element 200 into vortex light.

[0027]

number

[0028] In equation (3) above, φ is an angle in the range of 0 to 360°, and d represents the phase step of the helical component.

[0029] A spiral component is a component that has a continuous or stepped spiral shape.

[0030] As shown in Figure 1B, assuming that the above-mentioned first aspherical component and cone component do not include a helical component, and that a virtual first optical surface 410a with a shape including the first aspherical component and cone component is placed in place of the first optical surface 410, and that light emitted from the photoelectric conversion element 200 is incident on the virtual first optical surface 410a, then in a cross section including the first central axis CA1 of the virtual first optical surface 410a, the angle θ2 of the light ray incident on the virtual first optical surface 410a at the position furthest from the first central axis CA1 of the virtual first optical surface 410a after it has been incident on the virtual first optical surface 410a with respect to the first central axis CA1 is set to be within 0.5°. The virtual first optical surface 410a is the same as the first optical surface 410 except that it does not include a helical component. The first central axis CA1 of the virtual first optical surface 410a and the first central axis CA1 of the first optical surface 410 coincide. Furthermore, the outer edge of the virtual first optical surface 410a and the outer edge of the first optical surface 410 may coincide.

[0031] In this embodiment, the above equations (1), (2), and (3), which represent the components of the first optical surface 410, were optimized using lighting design and analysis software (Light Tools: Synopsys Japan G.K.) so that the light passing through the first optical surface 410 satisfies the above conditions.

[0032] Next, the structure of the first optical surface 410 will be described. Figure 2A is a perspective view of the first optical surface 410, Figure 2B is a plan view, Figure 2C is a side view, and Figure 2D is a cross-sectional view along line AA shown in Figure 2B. In Figures 2A to D, the shape of the first optical surface 410 is exaggerated to clarify its structural features.

[0033] As shown in Figures 2A to D, in this embodiment, the first optical surface 410 has a helical shape centered on the first central axis CA1 and includes a plurality of phase control surfaces 411 that are radially divided around the first central axis CA1, and a plurality of stepped surfaces 412 that connect the ends of two adjacent phase control surfaces 411.

[0034] Each of the multiple phase control surfaces 411 has a helical shape centered on the first central axis CA1 of the first optical surface 410. Here, each of the multiple phase control surfaces 411 may be a surface whose height in the direction along the first central axis CA1 changes smoothly and gradually depending on its circumferential position, or it may be a surface whose height changes in a step-like manner. The number of phase control surfaces 411 is not particularly limited. In this embodiment, the first optical surface 410 includes a plurality (four) of phase control surfaces 411 that produce similar phase differences. These plurality (four) of phase control surfaces 411 are arranged to be rotationally symmetric (four-fold symmetry) with respect to the first central axis CA1. Therefore, the plurality of phase control surfaces 411 have the same shape and are arranged in the same height range. Here, the height on the first optical surface 410 means the position in the direction along the first central axis CA1.

[0035] Each of the multiple phase control surfaces 411 is a convex surface, and in a side view, the curve extending from the center 414 of the first optical surface 410 to the outer periphery has an inflection point at the center 414 of the first optical surface 410. That is, in a cross-section including the first central axis CA1, the curve which is the cross-section of the phase control surface 411 has an inflection point at the center 414 of the first optical surface 410. More specifically, in a cross-section including the first central axis CA1, in regions other than the center 414 of the first optical surface 410, the inclination of the phase control surface 411 decreases as it approaches the central axis CA (it becomes nearly perpendicular to the first central axis CA1), but in the center 414 of the first optical surface 410, the phase control surface 411 includes a portion where the inclination increases as it approaches the first central axis CA1 (the angle with respect to the first central axis CA1 decreases). However, this does not apply to the very vicinity of the stepped surface 412, even in the central part 414 of the first optical surface 410.

[0036] The multiple stepped surfaces 412 each connect the ends of two adjacent phase control surfaces 411. In this embodiment, each of the multiple stepped surfaces 412 is a plane that extends radially from the first central axis CA1 to its outer edge. The upper edges of the multiple stepped surfaces 412 intersect at the center 414 of the vortex surface 210. The number of stepped surfaces 412 is the same as the number of phase control surfaces 411. In the example shown in this embodiment, the first optical surface 410 includes four stepped surfaces 412. These multiple (four) stepped surfaces 412 are arranged to be rotationally symmetric (four-fold symmetry) with respect to the first central axis CA1. Therefore, the multiple (four) stepped surfaces 412 have the same shape and are arranged within the same height range.

[0037] Note that there may be only one phase control surface 411 and one stepped surface 412.

[0038] The reflective surface 420 reflects light incident on the first optical surface 410 toward the second optical surface 430, or reflects light incident on the second optical surface 430 toward the first optical surface 410. The reflective surface 420 is positioned between the first optical surface 410 and the second optical surface 430. In this embodiment, since the optical module 100 is a transmitting optical module, the reflective surface 420 reflects light incident on the first optical surface 410 toward the second optical surface 430. The shape of the reflective surface 420 is not particularly limited as long as it can perform the above function. In this embodiment, the reflective surface 420 is planar and is inclined at 45° with respect to the direction of propagation of light that has been incident on the first optical surface 410 and become collimated light. Note that the reflective surface 420 does not have to be on the optical receptacle 400. For example, the first optical surface 410 and the second optical surface 430 may be positioned on opposite sides of the optical receptacle 400 so that light incident on the first optical surface 410 travels straight ahead and is emitted from the second optical surface 430.

[0039] The second optical surface 430 is either a convex surface convex toward the end face of the optical transmission body 300 for emitting light incident on the first optical surface 410 or light reflected by the reflective surface 420 toward the optical transmission body 300, or a convex surface convex toward the end face of the optical transmission body 300 for emitting light emitted from the end face of the optical transmission body 300. In this embodiment, since the optical module 100 is an optical module for transmission, the second optical surface 430 emits light incident on the first optical surface 410 or light reflected by the reflective surface 420 toward the optical transmission body 300. The second optical surface 430 is positioned opposite the optical transmission body 300. The second central axis CA2 of the second optical surface 430 and the central axis of the end face of the optical transmission body 300 may or may not coincide. The shape of the second optical surface 430 includes a second aspherical component. In this case, the shape of the second optical surface 430 does not have to include a helical component and a cone component. In this embodiment, the convex second optical surface 430 focuses the vortex light that has traveled through the optical receptacle onto the end face of the core of the optical transmission body 300. Preferably, the second aspherical component, shown in equation (4) below, is set such that the optical diameter of the light emitted from the second optical surface 430 at the end face of the optical transmission body 300 is 30 μm or less. This enables high-speed transmission and reception of large amounts of data using optical communication. Note that "optical diameter" is 1 / e of the maximum intensity of the light. 2 This refers to the spot diameter that provides the desired intensity.

[0040] The "second aspherical component Z" is given by equation (4) below.

[0041]

number

[0042] In equation (4) above, c is the curvature (reciprocal of the radius of curvature), k is the conic coefficient (conic coefficient), r is the distance from the optical axis (central axis of the second optical surface 430), and α1 to α8 represent the aspherical coefficients of the correction polynomial.

[0043] (simulation) Next, we simulated the positional misalignment tolerance of the photoelectric conversion element relative to the first optical surface.

[0044] In this simulation, the optical module for transmission of the embodiment and the optical module for transmission of the comparative example were used. In the optical modules of the embodiment and the comparative example, the distance between the photoelectric conversion element and the first optical surface was set to 0.3 mm. The distance between the second optical surface and the optical transmitter was set to 0.6 mm. In the first optical surface of the optical receptacle of the embodiment and the comparative example, the cone component represented by equation (2) above was set to θ = 2°. In the first optical surface of the optical receptacle of the embodiment and the comparative example, the helical component represented by equation (3) was set to φ = 90° (4 divisions). The first optical surface of the optical receptacle of the embodiment and the comparative example is formed by the superposition of the first aspherical component, the helical component, and the cone component, and the second optical surface includes the second aspherical component. Here, the first aspherical component of the first optical surface and the second aspherical component of the second optical surface differ between the optical receptacle for transmission of the embodiment and the optical receptacle for transmission of the comparative example. In the optical receptacle of the embodiment, the first aspherical component was designed so that the optical diameter of the light passing through the first optical surface is not broadened by the cone component. Specifically, as described above, assuming that a virtual first optical surface is placed in place of the first optical surface and that light emitted from the photoelectric conversion element is incident on the virtual first optical surface, the first aspherical component was designed so that, in a cross-section including the central axis of the virtual first optical surface, the angle of the light ray incident on the virtual first optical surface at the position furthest from the central axis of the virtual first optical surface after it has been incident on the virtual first optical surface is within 0.5°. In the optical receptacle of the comparative example, the first aspherical component was designed so that the light passing through the first optical surface is collimated when there is no cone component.

[0045] First, we used ray tracing with lighting design and analysis software (Light Tools: Synopsys Japan LLC) to investigate the optical diameter of the spot at the end face of the optical transmission body from the photoelectric conversion element. In this simulation, the shape of the spot at the end face of the optical transmission body is annular, so the optical diameter mentioned above represents the area outside that annular shape.

[0046] The spot diameter in the example was approximately 18.6 μm. On the other hand, the spot diameter in the comparative example was approximately 36.5 μm. Thus, the optical module in the example was able to reduce the spot diameter at the end face of the optical transmission body. This is thought to be because the angle of the light incident on the first incident surface with respect to the first central axis was reduced for the light ray incident at the position furthest from the central axis of the virtual first optical surface among the light rays incident on the virtual first optical surface.

[0047] Next, the central extinction diameter of the spot of the reflected light emitted from the photoelectric conversion element, reflected from the end face of the optical transmission material, and then returning to the light-emitting surface of the photoelectric conversion element was investigated using the beam propagation method. Here, the central extinction diameter is the diameter of the weakest part of the annular-shaped light, specifically when the light intensity is 10 W / mm². 2 This is the diameter of the portion that is less than [a certain value].

[0048] Figure 3 shows the spot of reflected light on the light-emitting surface of the photoelectric conversion element in the optical module of the embodiment. As shown in Figure 3, the central extinction diameter of the spot in the embodiment was approximately 7.4 μm.

[0049] Next, we investigated the light emitted from the photoelectric conversion element and traveling through the optical receptacle. Specifically, we first replaced the first optical surface with a virtual first optical surface having a shape that does not contain a helical component but includes a first aspherical component and a cone component. Then, assuming that the light emitted from the photoelectric conversion element was incident on the virtual first optical surface, we used lighting design and analysis software (Light Tools: Synopsys Japan G.K.) to determine the angle of the light ray incident on the virtual first optical surface with respect to the central axis, in a cross-section including the central axis of the virtual first optical surface, specifically the ray incident at the position furthest from the central axis of the virtual first optical surface. In the optical module of the example, this angle was 0.20°. In the optical module of the comparative example, this angle was 0.66°.

[0050] Next, the misalignment tolerance of the photoelectric conversion element relative to the first optical surface, including the first aspherical component, the helical component, and the cone component, was simulated. Specifically, the misalignment tolerance was assumed to be the case where the optical module was misaligned in the horizontal direction (X direction) perpendicular to the first central axis CA1, based on the state of the optical module in the above-described examples and comparative examples.

[0051] Figure 4A is a graph showing the relationship between the amount of movement of the photoelectric conversion element in the optical module of the embodiment and the coupling efficiency between the photoelectric conversion element and the optical transmission body, and Figure 4B is a graph showing the relationship between the amount of movement of the photoelectric conversion element in the optical module of the comparative example and the coupling efficiency between the photoelectric conversion element and the optical transmission body. In Figures 4A and 4B, the horizontal axis shows the amount of horizontal movement (μm) of the photoelectric conversion element relative to the state in which the first central axis CA1 and the optical axis of the photoelectric conversion element coincide, and the vertical axis shows the coupling efficiency (dB). The misalignment tolerance refers to the range of movement that is -0.5 dB, the maximum value of the coupling efficiency.

[0052] As shown in Figure 4A, the misalignment tolerance in the optical module of the example was 18 μm. On the other hand, as shown in Figure 4B, the misalignment tolerance in the optical module of the comparative example was 13 μm. As shown in Figure 4B, when the first optical surface includes a cone component, in a cross-section including the central axis of the virtual first optical surface, the angle of the light ray incident on the first optical surface at the position furthest from the central axis of the virtual first optical surface after it has been incident on the virtual first optical surface becomes larger, so the misalignment tolerance tends to be smaller. On the other hand, in the optical receptacle including the first optical surface with the adjusted first aspherical component of the example, this angle becomes smaller (collimated light), so it is thought that the misalignment tolerance can be increased.

[0053] (effect) As described above, according to the present invention, when a cone component is included, the misalignment tolerance of the photoelectric conversion element relative to the optical receptacle is reduced. However, since the first aspherical component and the cone component are adjusted so that the angle of the light ray incident on the virtual first optical surface at the position furthest from the central axis of the virtual first optical surface after it enters the virtual first optical surface is within 0.5°, the misalignment tolerance is large. [Industrial applicability]

[0054] The optical receptacle and optical module according to the present invention are useful for optical communication using a photoelectric conversion element and an optical transmission body. [Explanation of Symbols]

[0055] 100 optical modules 200 Photoelectric conversion elements 300 Optical Transmitter 400 optical receptacles 410 1st optical surface 410a Virtual first optical surface 420 Reflective surface 430 Second optical surface 411 Phase control surface 412 Step surface 414 Center CA1 1st center axis CA2 2nd center axis

Claims

1. An optical receptacle for optically coupling the end faces of a photoelectric conversion element and an optical transmission body when placed between the photoelectric conversion element and the optical transmission body, The aforementioned optical receptacle is, A first optical surface, which is a convex surface, is used to direct light emitted from the photoelectric conversion element into it, or to direct light emitted from the end face of the optical transmission body, which has passed through the inside of the optical receptacle, toward the photoelectric conversion element. A second optical surface, which is a convex surface, is used to cause light incident on the first optical surface to be emitted toward the end face of the optical transmission body, or to cause light emitted from the end face of the optical transmission body to be incident on it. It has, The shape of the first optical surface is formed by the superposition of a first aspherical component, a helical component, and a cone component. Assuming that a virtual first optical surface having a shape that does not include the helical component but includes the first aspherical component and the cone component is placed in place of the first optical surface, and that light emitted from the photoelectric conversion element is incident on the virtual first optical surface, the first aspherical component and the cone component are set such that, in a cross-section including the central axis of the virtual first optical surface, the angle of the light ray incident on the virtual first optical surface at the position furthest from the central axis of the virtual first optical surface after it has been incident on the virtual first optical surface is within 0.5°. Light receptacle.

2. The shape of the second optical surface includes a second aspherical component. The second aspherical component is set such that the optical diameter of the light emitted from the second optical surface at the end face of the optical transmission body is 30 μm or less. The optical receptacle according to claim 1.

3. The optical receptacle according to claim 1, further comprising a reflective surface for reflecting light incident on the first optical surface toward the second optical surface, or for reflecting light incident on the second optical surface toward the first optical surface.

4. Photoelectric conversion element, Optical transmission body and An optical receptacle according to any one of claims 1 to 3, disposed between the photoelectric conversion element and the optical transmission body, An optical module having

Images