CN103424822B - Light signal transmission device - Google Patents

Abstract

The invention relates to an optical signal transmission device, which includes a substrate, a plurality of light-emitting modules, an optical coupling element, an optical fiber module and a pressure rod. The substrate includes first and second carrying surfaces. The first and second bearing surfaces form a stepped structure. The optical coupling element is disposed on the first carrying surface, and includes a first covering portion and a plurality of optical coupling lenses penetrating through the first covering portion. Each optical coupling lens includes a bottom surface, a first end surface and a second end surface. The included angles between the first and second end surfaces and the bottom surface are both acute angles, and both protrude from the first covering part. A plurality of light emitting modules are arranged on the second carrying surface, and correspond to the plurality of first end surfaces respectively. The optical fiber module is arranged on the first carrying surface, and includes a second cladding part and a plurality of optical fiber cores passing through the second cladding part. Each optical fiber core includes a plurality of bare ends protruding from the second cladding. The pressing rod tightly presses the exposed end on the corresponding second end surface. The refractive indices of the substrate, the optical coupling lens and the fiber core are respectively n1, n2 and n3, and n3>n2>>n1.

Description

Optical Signal Transmission Device

technical field

The invention relates to the field of signal transmission, in particular to an optical signal transmission device.

Background technique

Current optical signal transmission devices generally adopt a direct coupling method, that is, the optical signal converged by a condenser lens is directly incident on the incident end surface of the optical fiber core. However, since the area of the incident end face of the optical fiber core is very small, it is not easy to align the condenser lens with the incident end face of the optical fiber core, resulting in relatively low production efficiency and product yield of the existing optical signal transmission device.

Contents of the invention

In view of this, it is necessary to provide an optical signal transmission device that can effectively improve production efficiency and production yield.

An optical signal transmission device includes a substrate, a plurality of light-emitting modules, an optical coupling element, an optical fiber module and a pressure rod. The substrate includes a first bearing surface and a second bearing surface, and a step structure is formed between the first bearing surface and the second bearing surface. The light coupling element is arranged on the first carrying surface, and includes a first covering part and a plurality of light coupling lenses penetrating through the first covering part. Each optical coupling lens includes a first end surface, a second end surface opposite to the first end surface and a bottom surface, the bottom surface faces the second bearing surface and connects the first end surface and the second end surface. The included angles between the first end surface, the second end surface and the bottom surface are all acute angles. Both the first end surface and the second end surface protrude from the first covering portion. The plurality of light emitting modules are arranged on the second carrying surface, and correspond to the plurality of first end surfaces respectively. The optical fiber module is arranged on the first carrying surface, and includes a second cladding part and a plurality of optical fiber cores passing through the second cladding part. Each optical fiber core includes a bare end protruding from the second cladding. The pressing rod tightly presses the plurality of exposed ends on the corresponding second end faces respectively. The refractive index of the substrate is n1, the refractive index of the optical coupling lens is n2, the refractive index of the optical fiber core is n3, the refractive index of air is n0, and n3>n2>>n1>n0.

Compared with the prior art, the optical signal transmission device of the present invention can transmit optical signals because the plurality of light-emitting modules are aligned with the corresponding first end faces, and the area of the first end faces is obviously smaller than that of the optical fiber core. The area of the incident end surface is large, so the multiple light emitting modules are relatively easy to align with the first end surface, thereby effectively improving the production efficiency and product yield of the optical signal transmission device.

Description of drawings

Fig. 1 is a schematic structural diagram of an optical signal transmission device according to a preferred embodiment of the present invention.

FIG. 2 is a partially exploded schematic diagram of the optical signal transmission device of FIG. 1 .

FIG. 3 is a cross-sectional view of the optical signal transmission device in FIG. 1 along the direction III-III.

Description of main component symbols

Optical Signal Transmission Device 100 Substrate 10 first bearing surface 101 Second bearing surface 102 Optical coupling element 30 First coating 31 optical coupling lens 32 top surface 321 bottom surface 322 first end face 323 second end face 324 Lighting module 50 fiber optic module 70 Second cladding 71 Fiber core 72 bare end 721 pressure rod 90

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

Referring to FIGS. 1-3 , an optical signal transmission device 100 provided in an embodiment of the present invention includes a substrate 10 , an optical coupling element 30 , a plurality of light emitting modules 50 , an optical fiber module 70 and a pressure rod 90 .

The substrate 10 is a strip thin plate, which includes a first carrying surface 101 and a second carrying surface 102 . A stepped structure is formed between the first bearing surface 101 and the second bearing surface 102 .

The light coupling element 30 includes a first covering portion 31 and a plurality of light coupling lenses 32 passing through the first covering portion 31 . The first covering portion 31 is a cuboid and located on the first bearing surface 101 . Each optical coupling lens 32 is a strip structure, and the cross-section along its own length direction is an isosceles trapezoid. Each optical coupling lens 32 includes a top surface 321 , a bottom surface 322 , a first end surface 323 and a second end surface 324 . The top surface 321 is opposite to the bottom surface 322 . The bottom surface 322 faces the second bearing surface 102 . The first end surface 323 and the second end surface 324 are opposite to each other, and are both connected to the top surface 321 and the bottom surface 322 . The longitudinal directions of the plurality of optical coupling lenses 32 are parallel to each other, and the first end surface 323 and the second end surface 324 of each optical coupling lens 32 protrude from the first covering portion 31 . The included angles between the first end surface 323 , the second end surface 324 and the bottom surface 322 are all acute angles. In this embodiment, the included angles between the first end surface 323 , the second end surface 324 and the bottom surface 322 are both 45°.

The plurality of light emitting modules 50 are disposed on the second carrying surface 102 and electrically connected to the substrate 10 . The plurality of light emitting modules 50 are located on the same straight line and correspond to the first end surfaces 323 of the plurality of optical coupling lenses 32 one by one. Each light emitting module 50 is aligned with the corresponding first end surface 323 . The light emitting module 50 is a vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL).

The optical fiber module 70 includes a second cladding portion 71 and a plurality of optical fiber cores 72 passing through the second cladding portion 71 . The second covering portion 71 is disposed on the first carrying surface 101 . The length directions of the plurality of optical fiber cores 72 are parallel to each other and correspond to the plurality of optical coupling lenses 32 one by one. Each of the plurality of optical fiber cores 72 includes a bare end 721 . The exposed end 721 protrudes from the second covering portion 71 and is disposed on the corresponding second end surface 324 .

The pressing bar 90 is used for applying pressure to the plurality of exposed ends 721 , so that the exposed ends 721 are tightly pressed on the corresponding second end surfaces 324 . In this embodiment, the longitudinal direction of the pressing rod 90 is perpendicular to the longitudinal direction of the plurality of optical coupling lenses 32 .

The refractive index of the substrate 10 is n1, the refractive index of the optical coupling lens 32 is n2, the refractive index of the optical fiber core 72 is n3, the refractive index of air is n0, and n3>n2>>n1>n0.

The working process of the optical signal transmission device 100 is as follows: the light emitted by the plurality of light emitting modules 50 respectively enters the corresponding optical coupling lens 32, is reflected by the corresponding first end surface 323, and is then reflected by the top surface 321 and the bottom surface 322. Continuous reflection, thus transmitted to the second end face 324 . Since the optical fiber core 72 is pressed on the second end surface 324 , and the refractive index of the optical fiber core 72 is higher than that of air, the light is transmitted toward the optical fiber core 72 . Since the pressing rod 90 closely fits the optical fiber core 72 and the second end face 324 , the air gap between the exposed end 721 and the second end face 324 can be further reduced, reducing light loss and improving light coupling efficiency.

Compared with the prior art, the optical signal transmission device of the present invention can transmit optical signals because the plurality of light-emitting modules 50 are aligned with the corresponding first end faces 323, and the area of the first end faces 323 is obviously larger than that of the optical fiber The incident end surface of the core 72 has a large area, so the plurality of light emitting modules 50 are relatively easy to align with the first end surface 323 , thereby effectively improving the production efficiency and product yield of the optical signal transmission device 100 .

It can be understood that those skilled in the art can make various other corresponding changes and modifications according to the technical concept of the present invention, and all these changes and modifications should belong to the protection scope of the claims of the present invention.

Claims (8)

1. a light signal transmission device, it includes a substrate, multiple light emitting module, an optical coupling Element, an optic module and a pressure bar；This substrate include first loading end and one second hold Section, forms ledge structure between this first loading end and this second loading end；This optical coupling element is arranged On this first loading end, and include first covering portion and multiple optocoupler running through this first covering portion Close lens；Each optical coupling lens include first end face, one opposing with this first end face second End face and a bottom surface, this bottom surface is towards this second loading end, and connects this first end face and this second end Face；Angle between this first end face and this second end face and this bottom surface is acute angle；This first end face and This second end face all stretches out this first covering portion；The plurality of light emitting module be arranged on this second loading end and Respectively with the plurality of first end face one_to_one corresponding；This optic module is arranged on this first loading end and includes One the second covering portion and multiple fiber cores running through this second covering portion；Each fiber cores includes stretching out this The exposed end of the second covering portion；The plurality of exposed end is the most closely pressed on the second end of correspondence by this pressure bar On face；The refractive index of this substrate is n1, and the refractive index of this optical coupling lens is n2, the folding of this fiber cores The rate of penetrating is n3, and the refractive index of air is n0, and n3 > n2 > > n1 > n0, each optical coupling lens also includes One end face opposing with this bottom surface, this end face is parallel to each other with this bottom surface, this first end face and this second End face is all connected with this end face and this bottom surface.

2. light signal transmission device as claimed in claim 1, it is characterised in that the plurality of optical coupling is saturating Mirror is strip structure, and each optical coupling lens is isosceles ladders along the cross section of himself length direction Shape.

3. light signal transmission device as claimed in claim 1, it is characterised in that this first end face and should Second end face angle respectively and between this bottom surface is 45 °.

4. light signal transmission device as claimed in claim 1, it is characterised in that the plurality of optical coupling is saturating The length direction of mirror is parallel to each other.

5. light signal transmission device as claimed in claim 4, it is characterised in that the length side of this pressure bar To vertical with the length direction of the plurality of optical coupling lens.

6. light signal transmission device as claimed in claim 1, it is characterised in that the plurality of light emitting module It is located along the same line.

7. light signal transmission device as claimed in claim 1, it is characterised in that the plurality of light emitting module It is vertical cavity surface emitting laser.

8. light signal transmission device as claimed in claim 1, it is characterised in that the plurality of light emitting module All electrically connect with this substrate.