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Aspheric fiber coupling lens

A fiber-optic coupling and aspheric surface technology, which is applied in the coupling of optical waveguides and other directions, can solve the problems of difficult cost reduction and increased manufacturing difficulty, and achieve the effects of improving applicability, positioning accuracy and low cost

Inactive Publication Date: 2009-10-28
E PIN OPTICAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of diffractive lenses to design fiber coupling lenses will increase the difficulty of manufacturing and make it difficult to reduce the cost. Therefore, it is necessary to develop optical fiber coupling lenses with simple optical surfaces and low cost that can be manufactured by molded glass technology to facilitate optical communication. The rapid development of the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0039] Please refer to figure 2 , 3 As shown, they are respectively a schematic structural diagram and a wave front aberration diagram of the first embodiment of the fiber coupling lens of the present invention; the fiber coupling lens 2 of this embodiment uses a glass material with a refractive index N d =1.58313, Abbe number v d =59.4, the first optical surface R1 and the second optical surface R2 are listed in the following table (1). The radius of curvature R (unit: mm) (the radius of curvature R) and the optical axis of the optical surface on the optical axis are listed. The thickness d2 of the fiber coupling lens 2 (unit: mm).

[0040] Table I)

[0041]

[0042]

[0043]In Table (1), f is the effective focal length, d2 is the thickness of the lens, nF is the refraction index, NAO is the number of apertures on the object side (number aperture on obj ective side), and NAI is the opening on the image side. The number of apertures (number aperture on image side), η is the c...

no. 2 example

[0049] The fiber coupling lens 2 of this embodiment uses a glass material with a refractive index N d =1.58313, Abbe number v d =59.4. The following table (2) lists the curvature radius R of the first optical surface R1 and the second optical surface R2 on the optical axis, the thickness d2 of the fiber coupling lens 2 on the optical axis, and the effective focal length. f. is the refraction value nF, the number of apertures on the object side NAO, the number of apertures on the image side NAI, and the coupling efficiency η.

[0050] Table II)

[0051]

[0052] From Table (2), it can be calculated:

[0053] d 2 f = 1.2023 ; R 1 - R 2 R 1 + R ...

no. 3 example

[0058] The fiber coupling lens 2 of this embodiment uses a glass material with a refractive index N d = 1.51424, Abbe number v d =63.7. The following table (3) lists the curvature radius R of the first optical surface R1 and the second optical surface R2 on the optical axis, the thickness d2 of the fiber coupling lens 2 on the optical axis, and the effective focal length. f. is the refraction value nF, the number of apertures on the object side NAO, the number of apertures on the image side NAI, and the coupling efficiency η.

[0059] Table (three)

[0060]

[0061] From Table (3), it can be calculated:

[0062] d 2 f = 0.8569 ; R 1 - R 2 R 1 + R ...

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Abstract

The invention relates to an aspheric fiber coupling lens which is used in a photocoupling module, is a lenticular lens having a positive diopter and comprises a first optical surface and a second optical surface, wherein the first optical surface and the second optical surface are respectively formed by aspheric surfaces. The following conditions are satisfied: 0.5<(d2 / f)<1.5; 1.0<(R1-R2) / (R1+R2)<2.0; 1.2<((1 / R1)-(1 / R2))*f<2.2, wherein f is the effective focal length of the aspheric fiber coupling lens; d2 is the thickness of the lens; R1 is the curvature radius of the first optical surface of the lens; and R2 is the curvature radius of the second optical surface of the lens. The aspheric fiber coupling lens has the advantages of small focus point and volume and high coupling efficiency, thereby improving the applicability of the photocoupling module.

Description

Technical field [0001] The invention relates to an aspheric optical fiber coupling lens used in a photoelectric coupling module, which can efficiently gather and focus the light emitted by a semiconductor laser for optical fiber transmission. Background technique [0002] Optical communication has been an important industry in recent years. Among optical communication components, photoelectric coupling modules include light sources of functional components (such as laser diodes or LEDs), optical fiber coupling lenses, and optical fibers. After the laser diode emits the data light, the data light is collected on the optical fiber through the optical fiber coupling lens, and then transmitted through the optical fiber. Such as figure 1 Because the diameter of the optical fiber is very small, between a few micrometers and tens of micrometers, and the size of the fiber coupling lens is also small, it is necessary not only to accurately position and focus in the X direction, but also ...

Claims

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Application Information

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IPC IPC(8): G02B6/42G02B6/32
Inventor 郭明哲
Owner E PIN OPTICAL IND
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