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Optical coupling module using a prism mirror to obtain parallel beams

a technology of optical coupling module and prism mirror, which is applied in the field can solve the problems of inability to coaxially align each collimate light, the distance between respective light sources cannot be smaller than such an outer size, and the size of optical coupling module is inevitably large, so as to achieve miniaturization of optical coupling module and smaller convergence lens

Inactive Publication Date: 2019-01-10
SHIMADZU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention describes a new optical coupling module that uses three semiconductor lasers and a prism mirror to efficiently transfer light from one optical fiber to another. The first and second semiconductor lasers are positioned perpendicular to each other, and the prism mirror reflects the second semiconductor laser's collimated light to the same direction as the first semiconductor laser's collimated light. This allows all the collimated lights to be incident into the optical fiber. The invention also uses a smaller converging lens and reduces the number of optical elements, resulting in a smaller and more efficient optical coupling module.

Problems solved by technology

Unfortunately, with respect to the laser light source disclosed in the Patent Document 1, 2, each light source has a certain outer size, so that a distance between respective light sources cannot be smaller than such outer size.
In addition, a plurality of light sources is installed together on the same plane along one specific direction, so that each collimate light cannot be coaxially aligned.
Therefore, the converging lens must be large and as a result, the size of the optical coupling module is inevitably large.

Method used

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  • Optical coupling module using a prism mirror to obtain parallel beams
  • Optical coupling module using a prism mirror to obtain parallel beams
  • Optical coupling module using a prism mirror to obtain parallel beams

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embodiment 1

[0027]FIG. 1 is a block diagram illustrating the optical coupling module according to the aspect of the Embodiment 1 of the present invention. Such optical coupling module is an optical coupling module that connects a laser beam to a fiber (optical fiber) and the optical coupling module is mounted in the rectangular parallelepiped housing 10.

[0028]The semiconductor lasers 1a-1c are installed to the three sides 10A-10C of the housing 10. A hole 10a is formed in the side 10D of housing 10 and each laser light from the semiconductor lasers 1a-1c is incident into the fiber 5 through the hole 10a.

[0029]FIG. 2 is a detail block diagram illustrating the optical coupling module installed to the housing according to the aspect of the Embodiment 1 of the present invention. The optical coupling module comprises the semiconductor lasers 1a-1c, the collimate lenses 2a-2c, the prism mirror 3, the convergence lens 4 and the fiber 5. Each of the semiconductor lasers 1a-1c irradiates the elliptic b...

embodiment 2

[0039]FIG. 4 is a block diagram illustrating the optical coupling module according to the aspect of the Embodiment 2 of the present invention. With respect to the optical coupling module according to the aspect of the Embodiment 2, the semiconductor lasers 1a-1c is mounted in the housing 10 so that the fast axis directions of the second collimate light and the third collimate light are parallel to each other and orthogonal to the fast axis direction of the first collimate light on the incident plane of the convergence lens.

[0040]In such case, referring to FIG. 4, the semiconductor lasers 1b, 1c indicated in FIG. 2 are turned 30-degrees clockwise to be in-place in such location. Specifically, the groove 11b of the semiconductor laser 1b indicated in FIG. 4 and the groove 11c of the semiconductor laser 1c indicated in FIG. 2 turns 30-degrees clockwise from the groove 11b of the semiconductor laser 1b and the groove 11c of the semiconductor laser 1c.

[0041]Referring to FIG. 5, the fast...

embodiment 3

[0043]FIG. 6 is a block diagram illustrating the optical coupling module according to the aspect of the Embodiment 3 of the present invention. The optical coupling module according to the aspect of the Embodiment 3 does not include a convergence lens 4 compared to the optical coupling module according to the aspect of the Embodiment 1, 2. Referring to FIG. 6, when the diameter of the fiber 5a is significantly larger than the diameter of the collimate lights C1-C3, the convergence lens 4 can be eliminated and as a result, the laser light from the prism mirror 3 can be directly incident into the fiber 5a.

[0044]In such case, no convergence lens 4 is involved, miniaturization and cutting the cost for the system can be further achieved.

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PUM

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Abstract

An optical coupling module reduces a number of optical elements, and includes a collimate lens 2a that collimates a light from the first semiconductor laser 1a and then outputs the first collimate light, a collimate lens 2b that collimates a light from the semiconductor laser 1b in a location at which an emission plane is approximately orthogonal to an emission plane of the semiconductor laser 1a and outputs the second collimate light. The collimate lens 2c collimates light from semiconductor laser 1c in-place in the location at which the emission plane faces the emission plane of the semiconductor laser 1b and outputs a third collimate light. A prism mirror 3 has a rectangular prism with a first reflection plane that reflects the second collimate light to a parallel direction to the first collimate light and a second reflection plane orthogonal to the first reflection plane and reflects the third collimate light to the parallel direction to the first collimate light.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application relates to, and claims priority from JP 2017-130777 filed Jul. 4, 2017, the entire contents of which are incorporated herein by reference.FIGURE SELECTED FOR PUBLICATION[0002]FIG. 1BACKGROUND OF THE INVENTIONField of the Invention[0003]The present invention relates to an optical coupling module that combines lights emitted from a plurality of light sources.Description of the Related Art[0004]An optical coupling module combines lights emitted from a plurality of light sources and emits the combined light coaxially or allows the light to be incident into one optical fiber. Such optical coupling modules are based on a wavelength multiplex mode using an optical element providing a wavelength selectivity according to the difference between wavelengths or a space coupling mode using a mirror or a prism.[0005]When a size of an optical coupling module is small, the size and the number of mirrors and prisms that change the directi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B27/30G02B27/09G02B9/12G02B6/32
CPCG02B27/0972G02B27/0977G02B6/32G02B27/0955G02B9/12G02B27/30G02B6/4214G02B6/43G02B27/108G02B27/126G02B27/14G02B6/4206G02B6/2817
Inventor ISHIGAKI, NAOYATOJO, KOJI
Owner SHIMADZU CORP