CN2533481Y

CN2533481Y - Fibre-optical collimator

Info

Publication number: CN2533481Y
Application number: CN 02225447
Authority: CN
Inventors: 周明宝; 杨志合; 刘庆
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2002-01-26
Filing date: 2002-01-26
Publication date: 2003-01-29
Anticipated expiration: 2012-01-26

Abstract

An optical fiber collimator comprises an optical fiber base pin with optical fibers and a molding lens which is roughly cylindrical in shape and is used to collimated and output the beam of the optical fiber or to gather the parallel lights to the optical fiber. The molding lens is provided with two terminal surfaces, one of which is a non-spherical surface and the other is an inclined surface. The optical fiber base pin is roughly cylindrical in shape and is provided with via holes in the inner part to accommodate and fixedly hold the optical fiber. One terminal surface and the corresponding optical fiber end are also grinded into a certain angle and are opposite to the inclined surface of the molding lens. After the relative position of the optical fiber base pin to the molding lens is adjusted, the two can be fixedly held by an outer casing pipe.

Description

Optical fiber collimator

[technical field]

The utility model is about a kind of optical fiber collimator, refers to a kind of optical fiber collimator that adopts the die casting lens especially.

[background technology]

Owing to optical fiber tool wideband, low-loss, be not subjected to characteristic such as electromagnetic interference effect,, particularly bringing into play more and more important effect in the optical communication field in the light transmission field.Yet; light signal is after input optical fibre enters optical system; usually can carry out multiple optical effect through intrasystem optical device, involve as filtering, modulation, branch and close ripple etc., again via one or more output optical fibre output; because input optical fibre and output optical fibre are not same optical fiber; and the diameter of optical fiber less than the diameter of optical device, therefore, adopts optical fiber collimator to make flashlight collimation back input optical device usually during transmission; thereby reduce to insert loss, have very important meaning.

The optical fiber collimator that prior art discloses generally comprises the optical fiber contact pins and a GRIN Lens (Graded-Index Lens, GRIN Lens) of a tool optical fiber.Wherein, it is cylindric that contact pin roughly is, and inside is offered through hole and is used to accommodate fixing optical fiber, thereby protect optical fiber and be convenient to optical fiber and the relative positioning of GRIN Lens.GRIN Lens is the radially optical lens of gradual change of a kind of refractive index, and it roughly is cylindric, and pitch is 0.23 or 0.25, is used for the light beam from optical fiber is changed into directional light or directional light is focused on the back input optical fibre.In addition, in order to increase return loss, optical fiber contact pins and GRIN Lens opposing end surface all grind to form special angle (generally being that 6 degree are to 8 degree), and the equal plating counnter attack of the end face of GRIN Lens material, are used to improve the whole optical property of optical fiber collimator.

But the optical fiber collimator that adopts GRIN Lens to constitute has some shortcomings.At first, because GRIN Lens is by the ions diffusion manufactured, so its form accuracy is not high, need further to handle, and GRIN Lens need grind to form specific angle with respect to the end face of contact pin, so cause complex procedures, expend man-hour, and then make the cost up of optical fiber collimator.Secondly, can use some to contain the chemical material of toxin in the process of employing ions diffusion manufactured GRIN Lens, therefore pollute the environment, also can operating personnel's health be damaged.In addition, in order to improve the whole optical property of optical fiber collimator, need be at the end face plating counnter attack layer (AR-Coating) of GRIN Lens, but because GRIN Lens is the radial refractive index progressive lens, make easily behind the plating counnter attack layer that the reflectivity of GRIN Lens end face each point is inconsistent, and then can influence its optical property.

Therefore, provide a kind of improved optical fiber collimator real for necessary, this optical fiber collimator adopts the die casting lens (Molding Lens) with constant refractive index to realize the collimation of light beam, and its precision height, optical property is good, easily manufactured, with low cost and help environmental protection.

[summary of the invention]

The purpose of this utility model is to provide a kind of optical fiber collimator, it adopts the die casting lens to realize the collimation of light beam, these die casting lens have constant refractive index, manufacturing is simple, precision is high, optical property is good, and with low cost, can reduce the whole cost of optical fiber collimator.

Optical fiber contact pins and die casting lens that provide an optical fiber collimator to comprise a tool optical fiber are provided the purpose of this utility model.This optical fiber contact pins is accommodated fixing optical fiber, and these die casting lens are one-body molded by transparent materials such as glass or plastics, is used to collimate the light beam of this optical fiber of output, or directional light is gathered in optical fiber.Behind the relative position of this contact pin of adjustment and die casting lens, directly fix both with viscose glue, or by the outer tube fixing.

Compared with prior art, the utlity model has following advantage: the die casting lens that it adopts are by the manufacturing of mold pressing one-step moulding method, the form accuracy height, make convenient, to expend man-hour few, cost is low, its refractive index is constant, and each point refractive index unanimity behind the end face plating counnter attack layer helps the lifting of the whole optical property of optical fiber collimator, and need not use poisonous chemical material in the production run, help health of operators.

[description of drawings]

Fig. 1 is the sectional view of the utility model optical fiber collimator first embodiment.

Fig. 2 is the sectional view of the die casting lens of the utility model optical fiber collimator first embodiment employing.

Fig. 3 is the index path of the utility model optical fiber collimator first embodiment.

Fig. 4 is the sectional view of the utility model optical fiber collimator second embodiment.

Fig. 5 is the index path of the utility model optical fiber collimator second embodiment.

[embodiment]

See also Fig. 1, the sectional view of the utility model optical fiber collimator first embodiment.This optical fiber collimator 10 comprises die casting lens 11, an optical fiber contact pins 12, passes through optical fiber 13, outer tube 14 and the metal sleeve 15 of optical fiber contact pins 12 fixings.

This optical fiber contact pins 12 roughly is cylindric, adopts pottery, metal or other material to make, and comprises that biend and runs through inner through hole 121.One end face of this optical fiber contact pins 12 is plane (not indicating), and through hole 121 forms a tapered opening (not indicating) near this place, plane, inserts in order to optical fiber 13, and the other end relative with tapered opening is that the inclination angle is the dip plane 122 of 6 degree to 8 degree.Optical fiber 13 is immobilizated in the optical fiber contact pins 12 by viscose glue, and its end is concordant with dip plane 122.

See also Fig. 2, these die casting lens 11 roughly are cylindric, and the refractive index that tool is constant can be used for collimating from the light beam of optical fiber 13 outputs or with directional light and converges to optical fiber 13.One end face of these die casting lens 11 is an aspheric surface 111, and for increasing return loss, it is the dip plane 112 of 6 degree to 8 degree that the other end grinds to form the inclination angle.In addition, aspheric surface 111, the dip plane 112 of these die casting lens 11 all are coated with the counnter attack layer, to improve the whole optical property of this optical fiber collimator 10.

These die casting lens 11 can adopt material manufacturings such as glass or plastics.When adopting glass material,, when adopting plastic material, generally pass through method manufacturings such as ejection formation, casting, hot-forming or ultraviolet light polymerization generally by compression molding.

This outer tube 14 adopts glass material to make, and roughly is cylindric, and its slightly larger in diameter is used for this optical fiber contact pins 12 of suit fixing and die casting lens 11 in the diameter of die casting lens 11 and optical fiber contact pins 12.For further protecting optical fiber collimator 10, can select a sheathed metal sleeve 15 on outer tube 14.

During assembling, at first smear epoxy glue, insert the through hole 121 of optical fiber contact pins 12, and fix with epoxy glue by pyramidal structure at optical fiber 13 tail ends; Then optical fiber contact pins 12 and die casting lens 11 are inserted in the outer tubes 14, wherein, the dip plane 112 of die casting lens 11 and the dip plane of optical fiber contact pins 12 122 are adjacent and be parallel to each other, and the end nipple of its aspheric surface 111 is stretched out outside the sleeve pipe 14; Metal sleeve 15 is set on the outer tube 14; Optical fiber contact pins 12 and die casting lens 11 keep suitable spacing, and its relative positioning of adjustment reaches best with every optical property of guaranteeing optical fiber collimator 10; Fixing by baking at last.

Seeing also Fig. 3, is the index path of the utility model optical fiber collimator first embodiment.One focus of these die casting lens 11 (not indicating) is positioned at the dip plane 122 of optical fiber contact pins 12, be transferred to the dip plane 112 of die casting lens 11 from the light beam 16 of optical fiber 13, because changing transmission direction, refraction effect forms light beam 17, when the aspheric surface 111 of die casting lens 11, reflect once more, be collimated into a branch of directional light 18, and be transferred in the optical device (figure does not show).

Because the reversibility of light path, the light beam of exporting from optical device also can converge to the optical fiber 13 through die casting lens 11.

Seeing also Fig. 4, is the sectional view of the utility model optical fiber collimator second embodiment.These optical fiber collimator 20 structures are identical substantially with the structure of the first embodiment optical fiber collimator 10, but optical fiber contact pins is two optical fiber contact pins 22, is built-in with two

optical fiber

23,25, and are directly fixing with viscose glue 24 behind two optical fiber contact pins 22 and die casting lens 21 relative positionings.

These die casting lens 21 have constant refractive index, be used for from the output optical alignment of optical fiber 23 (25) to an external optical device 40 (as filter plate), simultaneously, these optical device 40 beam reflected are converged to optical fiber 25 (23).This pair optical fiber contact pins 22 be used to accommodate, fixing and this two

optical fiber

23,25 of protection; and be convenient to the relative positioning of

optical fiber

23,25 and die casting lens 21; this two

optical fiber

23 and 25 is that opposing parallel is laid in two optical fiber contact pins 22, and the symmetrical of die casting lens 21 distributes relatively.

Seeing also Fig. 5, is the index path of the utility model optical fiber collimator second embodiment.One focus of these die casting lens 21 does not indicate the inclined end face (not indicating) that is positioned at two optical fiber contact pins 22.After being input to the dip plane 212 of die casting lens 21 from the light beam 31 of optical fiber 23 (25), because refraction effect, change transmission direction and form light beam 32, aspheric surface 211 through die casting lens 21 reflects once more, output parallel beam 33 is to optical device 40 (as filter plate etc.), optical device 40 beam reflected 34 then reflect into light beam 35 in the aspheric surface 211 of die casting lens 21, and 212 places and converge to optical fiber 25 (23) once more through reflecting into light beam 36 in the dip plane.

But the utility model is not limited in and adopts single fiber or two optical fibre optical fibre collimating apparatus, is equally applicable to adopt the collimating apparatus of many optical fiber.

Claims

1. optical fiber collimator, it comprises at least one optical fiber, an optical fiber contact pins, wherein this optical fiber contact pins is accommodated this at least one optical fiber of fixing, it is characterized in that this optical fiber collimator further comprises die casting lens, these die casting lens and optical fiber contact pins relative positioning.

2. optical fiber collimator as claimed in claim 1 is characterized in that this optical fiber contact pins and die casting lens adjacent face are parallel to each other and fix by viscose glue.

3. optical fiber collimator as claimed in claim 1 is characterized in that these die casting lens have constant refractive index.

4 optical fiber collimators as claimed in claim 1 is characterized in that these die casting lens are one-body molded by transparent materials such as glass or plastics.

5. optical fiber collimator as claimed in claim 3 is characterized in that these die casting lens have both ends of the surface, and wherein an end face is an aspheric surface, and the other end is the dip plane, and its degree of tilt is about 6 degree to 8 degree.

6. optical fiber collimator as claimed in claim 5 is characterized in that the dip plane of these die casting lens and optical fiber contact pins are adjacent.

7. optical fiber collimator as claimed in claim 5 is characterized in that these die casting lens both ends of the surface all are coated with the counnter attack layer.

8. optical fiber collimator as claimed in claim 1 is characterized in that this collimating apparatus further comprises an outer tube, its this optical fiber contact pins of suit fixing and die casting lens.

9. optical fiber collimator as claimed in claim 1 is characterized in that fixing two optical fiber in this optical fiber contact pins.

10. optical fiber collimator as claimed in claim 9 is characterized in that this two optical fiber is parallel being laid in the optical fiber contact pins.

11. optical fiber collimator as claimed in claim 10 is characterized in that this two optical fiber distributes with respect to the symmetrical of die casting lens.