CN102809786A - Package of electro-optical module for plastic optical fiber - Google Patents

Abstract

The invention discloses a structure of an electro-optical module for plastic optical fiber and a packaging method of the electro-optical module for plastic optical fiber. The electro-optical module structurally comprises an electro-optical chip (1) and a spherical lens (2) on the same. The electro-optical module is packaged by a special process including selection of plastic packaging materials and designing and processing of the plastic packaging lens.

Description

A kind of encapsulation of plastic optical fiber electricity consumption optical module

Technical field

The invention belongs to the active electro-optical device class of plastic optical fiber communication products, it relates to the method for packing that single-shot or transceiving integrated module are provided.

Background technology

Along with people's is to the increase of network bandwidth requirement, and to the deep exploitation of information transmission product, and market is satisfied the transmission medium that user performance requires and cost also constantly reduces and more and more is badly in need of various.In order to solve the access difficult problem of " last hundreds of rice ", researcher has found the substitute of copper cash and silica fibre finally, and it is exactly the access difficult problem preferred plan that solves " last hundreds of rice " that plastic optical fiber, it and silica fibre are used.

Because light connector special in the glass optical fiber is not used in the application of plastic optical fiber; But directly use plastic optical fiber to be connected with the plastics optical module; This just requires the plastics optical module when not having extra device, and the light that comes out the electric light chip is easy to be coupled in the plastic optical fiber and goes.Electric light module for glass optical fiber is used in order to increase light transmission of power in optical fiber, increases a glass lens usually between optical fiber and receiving chip, can make whole coupling technique very complicated but between plastic optical fiber and receiving chip, increase a glass lens; Simultaneously, if do not increase lens, be coupled to luminous energy in the plastic optical fiber with less, can cause luminous energy that light transmits in plastic optical fiber very little, transmission range will be very short.For this awkward problem, the invention provides a kind of special packaging technology, this special technology comprises the selection of carrying out capsulation material and the design and the processing of plastic packaging lens.

Summary of the invention:

In order to reach, the invention provides a kind of special package technology of plastic optical fiber electricity consumption optical module to the effective coupling between plastic optical fiber and the electric light module.

To achieve these goals, of the present invention theing contents are as follows: directly encapsulating a kind of transparent plastic packaging glue on the electric light chip, and be processed into sphere lens to plastic packaging glue and plastic optical fiber coupling place, forming plastic optical fiber electricity consumption optical module of the present invention.The structure of electric light module is as shown in Figure 1, and it comprises an electric light chip [1], the plastic lens of globulate [2] on chip.

The circular light spot that certain angle of divergence is only arranged that sends by electric light chip [1]; Increase along with distance; This circular light spot is with increasing;, glass optical fiber can on the light path between electric light chip and the optical fiber, increase a glass lens usually in using, after the light that will disperse focuses on, and as far as possible transmission of energy that most luminous energy is sent to just can make light in the optical fiber more.Plastics electric light module of the present invention has adopted a kind of special technology when carrying out plastic package, described special process comprises the selection of capsulation material and the design and the processing of plastic packaging lens.

The capsulation material of plastics electric light module of the present invention adopts the epoxy resin of modification, and the refractive index of this resin material needs the refractive index greater than air.

The design of the plastic packaging lens of plastics electric light module of the present invention need be designed to spherical function to realize diverging light is compiled according to the principle of geometrical optics, and as shown in Figure 2, the radius of ball is that r, the centre of sphere are C; Optical axis is QQ '; The O point is the intersection point of optical axis and sphere, also is the summit of sphere, and M is any point on the sphere; The light gathering power Ф of sphere determines that by the radius-of-curvature of refraction sphere and the refractive index of its both sides medium its formula is shown in (1).

$\mathrm{\Φ}=\frac{n^{\′}-n}{r}---\left(1\right)$

In the formula;

R: the radius-of-curvature of refraction sphere,

N: the refractive index of air,

N ': the refractive index of capsulation material,

According to Fermat principle, model as shown in Figure 2 is calculated, following relation is arranged suc as formula (2):

Light path L _{QMQ '}=light path L _{Q0Q '}(2)

Under paraxial condition, through the formula of calculating (3):

$\frac{n^{\′}}{P^{\′}}-\frac{n}{P}=\frac{(n^{\′}-n)}{r}---\left(3\right)$

In the formula:

P ': object distance

P: image distance

According to Gauss formula (4)

$\frac{f^{\′}}{P^{\′}}+\frac{f}{P}=1---\left(4\right)$

In the formula

F is picture side's focal length of spherical lens,

F is the object space focal length of spherical lens.

According to formula (2), the radii size of ball can be released suc as formula shown in (5) in (3), (4),

$r=\frac{n^{\′}-n}{n^{\′}}{f}^{\′}---\left(5\right)$

Plastic optical fiber used in the present invention, what can be similar to thinks that the light that in optical fiber, transmits is directional light, that is to say that P is ∞ or bigger, can calculate P according to formula (4).

As shown in Figure 3, the radius of ball is that r, the centre of sphere are C, and optical axis is QQ '; The O point is the intersection point of optical axis and sphere, and M is any point on the sphere, and F ' is a focus in object space; F is a rear focus, and the spot radius at place, transmitting chip place is h ' time, and the spot radius of picture is h at Q point place; The size of h is shown in (6)

$h=\frac{{\mathrm{Pn}}^{\′}}{P^{\′}n}{h}^{\′}---\left(6\right)$

Under the situation of known P ', n, n ', r, h ', just can calculate imaging facula radius h ' size according to formula (1), (2), (3), (4), (5), (6).

Description of drawings

Fig. 1: the structural representation of plastic optical fiber electricity consumption optical module

Wherein, 1, electric light chip; 2, packaging plastic; 3, plastic optical fiber

Fig. 2: the principle chart of the sphere lens in the plastic optical fiber electricity consumption optical module

Wherein, The radius of r, ball; C, the centre of sphere; QQ ', optical axis; The intersection point of O, optical axis and sphere; Any point on M, the sphere,

Fig. 3: the image height schematic diagram calculation of the sphere lens in the plastic optical fiber electricity consumption optical module

Wherein, The radius of r, ball; C, the centre of sphere; QQ ', optical axis; The intersection point of O, optical axis and sphere; Any point on M, the sphere; F ', focus in object space; F, rear focus; The spot radius at h ', place, transmitting chip place; The spot radius of h, Q point place picture.

Embodiment

The method for packing of a kind of plastic optical fiber electricity consumption optical module provided by the invention, its embodiment will combine accompanying drawing to further specify as follows:

In the present invention, at first need realize, must in plastic packaging glue, transmit, select the capsulation material that to realize light transmission for this reason specially for use in the same time of encapsulation to the electric light Chip Packaging.In the present invention, the plastic packaging glue of selecting for use is modified epoxy, and the refractive index of capsulation material is 1.5 refractive indexes 1.0 greater than air.It had both realized the sealing to the electric light chip, had realized that simultaneously light can transmit in this plastic packaging glue.

For the function that realizes diverging light is compiled, must be processed as convex surface to the plastic packaging face.And after light comes out from the plastic packaging sphere, be sent to earlier in the air, be coupled in the optical fiber again.In optical-fibre communications, what can be similar to thinks that the light that from optical fiber, transmits is directional light, in the present embodiment, that is to say P '=0.9mm, n=1, and n '=1.5, r=0.35 can calculate P=4.73mm according to formula (4).

Known h '=0.01 h=0.079mm considers the assembling equal error again, and the numerical aperture that emission light fully can coupled fiber is in the optical fiber of 0.3-1.0mm, realizes the transmission of electric light translation function and light.

Claims (6)

1. the packaged type of a plastic optical fiber electricity consumption optical module, it is characterized in that this plastic optical fiber electricity consumption optical module [1] and on chip the plastic lens [2] of globulate form.

2. the packaged type of plastic optical fiber electricity consumption optical module as claimed in claim 1 is characterized in that this electric light module has adopted a kind of selection and the design of plastic packaging lens and special process of processing that comprises capsulation material when carrying out plastic package.

3. the material that is adopted in the plastic optical fiber electricity consumption light module package as claimed in claim 2 is selected the epoxy resin of modification, and the refractive index of this resin material needs the refractive index greater than air.

4. the design of plastic optical fiber electricity consumption optical module plastic packaging lens as claimed in claim 2 need be designed to spherical function to realize diverging light is compiled with the principle of processing according to geometrical optics.

5. the radius r of plastic optical fiber electricity consumption optical module sphere lens as claimed in claim 4 calculates according to formula

.

6. the function in order to realize diverging light is compiled as claimed in claim 4; The picture that need obtain dwindling, as big or small h can calculate according to formula .

Images