CN209803383U - Compact type single-mode single optical fiber collimator with low rotation angle and high return loss of light beam - Google Patents
Compact type single-mode single optical fiber collimator with low rotation angle and high return loss of light beam Download PDFInfo
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- CN209803383U CN209803383U CN201920869748.3U CN201920869748U CN209803383U CN 209803383 U CN209803383 U CN 209803383U CN 201920869748 U CN201920869748 U CN 201920869748U CN 209803383 U CN209803383 U CN 209803383U
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Abstract
The utility model relates to a single optical fiber collimator of single mode of rotatory low deflection angle high return loss of compact light beam, wherein, single optical fiber collimator of single mode include single optical fiber pigtail of single mode, G-lens gradual change refractive index lens and corner right angle prism, make the light path can take place the turn through corner right angle prism, simultaneously, and be equipped with 8 degrees tangent planes on the single optical fiber pigtail of single mode, set up the tangent plane of 3 degrees in the G-lens gradual change refractive index lens for the light path can be by better propagation. The compact single-mode single-fiber collimator with the structure has the advantages of low rotation angle of light beams, high return loss, capability of turning light paths, small deflection angle, high return loss and small packaging size.
Description
Technical Field
the utility model relates to an optics field especially relates to the optical transmission field, specifically indicates a high return loss single mode fiber collimator of compact rotatory low deflection angle of light beam.
Background
The central optical axis of an optical system of a common single optical fiber collimator at present is generally a straight line and cannot be directly turned; and the lens and the inclined end face of the single fiber pigtail are polished by 8 degrees to form a certain beam deflection angle (the degree of the beam deviating from the central optical axis of the system); and the lens and the single fiber pigtail are all partially exposed outside the outer sealing tube, increasing the overall appearance length, as shown in fig. 1, it can be seen from fig. 1 that the basic structure of the single fiber collimator in the prior art includes a single mode single fiber pigtail 1, a lens 8 and an outer sealing tube 7, the single mode single fiber pigtail and the lens include the sections with the same section angle, the two sections with the same section angle are arranged oppositely, fig. 1 is the structural schematic diagram of the single fiber collimator in the prior art. The light path of the single fiber collimator in the prior art is shown in fig. 2, and it can be seen from fig. 2 that the effect of the light path after the gradual change refractive lens is designed for the light beam emitted from the single mode single fiber pigtail, and it can be seen from the figure that the light beam exiting from the end face of the lens has a tendency of obviously inclining downwards, and there is an obvious included angle between the light beam and the central optical axis of the optical system, which is called as a light beam deflection angle, mainly caused by 8 degrees polishing of the lens and the inclined end face of the single fiber pigtail, and no turning occurs after the light beam having the obviously inclined downwards, for example, 90 degrees rotation does not occur in the single fiber collimator in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming of above-mentioned prior art, providing a compact type rotatory low deflection angle high return loss's of light beam single mode fiber collimator that compact structure, encapsulation size are less, light path can turn, the deflection angle is less.
In order to achieve the above object, the present invention provides a compact single-mode single-fiber collimator with low rotation angle and high return loss of light beam, comprising:
The compact single-mode single-fiber collimator with low rotation angle of light beams and high return loss is mainly characterized in that the single-mode single-fiber collimator comprises a single-mode single-fiber tail fiber, a G-lens gradient index lens and a corner right-angle prism, the single-mode single-fiber tail fiber is adjacent to the G-lens gradient index lens, and one end of the G-lens gradient index lens, which is not adjacent to the single-mode single-fiber tail fiber, is adjacent to a right-angle surface of the corner right-angle prism;
The section angle of one end of the single-mode single-fiber pigtail, which is adjacent to the G-lens graded index lens, is 8 degrees;
The section angle of one end of the G-lens graded index lens, which is adjacent to the single-mode single-fiber tail fiber, is 3 degrees;
The upper half part of one end of the single-mode single-fiber tail fiber adjacent to the G-lens graded index lens is provided with a first long platform with the height smaller than the radius of the single-mode single-fiber tail fiber, and the lower half part of one end of the G-lens graded index lens adjacent to the single-mode single-fiber tail fiber is provided with a second long platform with the height smaller than the radius of the G-lens graded index lens.
Preferably, the gap distance between the single-mode single-fiber pigtail and the G-lens graded index lens is between 0.06 mm and 0.12 mm.
Preferably, the single-mode single-fiber pigtail has a diameter ofThe length is 3mm, and the height of the first long platform is 0.3 mm.
Preferably, the single-mode single-fiber pigtail comprises an optical mode fiber and a fiber with a diameter ofThe optical mode fiber is positioned in the single mode fiber capillary.
Preferably, the diameter of the G-lens graded index lens isThe peripheral section is 0.24, and the height of the second long platform is 0.3 mm.
Preferably, the triangular surface of the corner right-angle prism is an equilateral right-angle triangle of 0.7 × 0.7 mm.
Preferably, the two right-angle surfaces in the corner right-angle prism are both plated with high antireflection film layers with corresponding working wavelengths, and the sizes of the two right-angle surfaces are both 0.7 × 0.7 mm; the middle inclined plane end of the corner right-angle prism is plated with a high reflection film layer with corresponding working wavelength.
Preferably, a thick ceramic gasket is arranged between the G-lens graded index lens and the corner right-angle prism.
More preferably, the height of the thick ceramic pad is 0.0775 mm.
Preferably, the single-mode single-fiber collimator further comprises an outer sealing tube, the single-mode single-fiber pigtail and the G-lens graded index lens are wrapped in the outer sealing tube, the size of the outer sealing tube is 1.2 × 5.5mm, and the outer sealing tube is provided with four small holes with the aperture of 1.11 mm.
The compact single-mode single-fiber collimator with low rotation angle and high return loss of light beams comprises a single-mode single-fiber tail fiber, a G-lens gradient index lens and a corner right-angle prism, wherein the single-mode single-fiber tail fiber is adjacent to the G-lens gradient index lens, and one end of the G-lens gradient index lens, which is not adjacent to the single-mode single-fiber tail fiber, is adjacent to the right-angle surface of the corner right-angle prism; the single-mode single-fiber collimator is adopted to enable the central optical axis of an optical system of the single-mode single-fiber collimator to rotate according to a preset angle, the central optical axis of the optical system is turned according to the preset angle through a corner right-angle prism in the single-mode single-fiber collimator, light beams passing through the optical system are turned according to the preset angle, the rotating angle can be changed differently according to different angle designs of the corner right-angle prism, the deflection angle of the light beams is smaller, and the included angle between the light beams and the central optical axis of the optical system is smaller; the light beams emitted from the end face of the lens are concentrated near the central optical axis of the system, the included angle between the light beams and the central optical axis of the optical system is obviously smaller than that of a single optical fiber collimator in the prior art, and the light beams are transmitted in the preset direction after being rotated by the angle set by the right-angle prism, so that the return loss is higher, the packaging size is smaller, and the application range is wide.
Drawings
Fig. 1 is a schematic diagram of a single fiber collimator in the prior art.
Fig. 2 is a schematic diagram of the optical path effect of a single fiber collimator in the prior art.
Fig. 3 is a schematic diagram of the compact single-mode single-fiber collimator with low rotation angle and high return loss of the light beam.
fig. 4 is the light path effect schematic diagram of the compact single-mode single optical fiber collimator with low rotation angle and high return loss of the light beam.
fig. 5 is a schematic diagram of a single-mode fiber pigtail in a single-mode fiber collimator with a compact beam rotation, a low deflection angle and a high return loss.
Fig. 6 is a schematic diagram of a G-lens graded index lens in a compact, low deflection angle, high return loss, single mode, single fiber collimator of the present invention.
reference numerals
1 single-mode single-fiber pigtail
2G-lens graded index lens
3 corner right-angle prism
4 first long platform
5 second long platform
6 thick ceramic pad
7 external sealing tube
8 lens
Detailed Description
In order to more clearly describe the technical content of the present invention, the following further description is given with reference to specific embodiments.
The compact single-mode single-fiber collimator with low rotation angle of light beams and high return loss comprises a single-mode single-fiber tail fiber 1, a G-lens graded index lens 2 and a corner right-angle prism 3, wherein the single-mode single-fiber tail fiber 1 is adjacent to the G-lens graded index lens 2, and one end of the G-lens graded index lens 2, which is not adjacent to the single-mode single-fiber tail fiber 1, is adjacent to a right-angle surface of the corner right-angle prism 3;
The section angle of one end of the single-mode single-fiber pigtail 1 adjacent to the G-lens graded index lens 2 is 8 degrees, and a corresponding working wavelength antireflection film layer is plated;
The section angle of one end of the G-lens gradient refractive index lens 2, which is adjacent to the single-mode single-fiber tail fiber 1, is 3 degrees, and an antireflection film layer with a corresponding working wavelength is plated;
The upper half part of one end of the single-mode single-fiber tail fiber 1 adjacent to the G-lens graded index lens 2 is provided with a first long platform 4 with the height smaller than the radius of the single-mode single-fiber tail fiber 1, and the lower half part of one end of the G-lens graded index lens 2 adjacent to the single-mode single-fiber tail fiber 1 is provided with a second long platform 5 with the height smaller than the radius of the G-lens graded index lens 2.
In the above embodiment, the gap distance between the single-mode single-fiber pigtail 1 and the G-lens GRIN lens 2 is 0.06-0.12 mm.
in the above embodiment, the single-mode single-fiber pigtail 1 has a diameter ofThe length is 3mm, and the height of the first long platform 4 is 0.3 mm.
In the above embodiment, the single-mode single-fiber pigtail 1 comprises an optical mode fiber and a fiber with a diameter ofThe optical mode fiber is positioned in the single mode fiber capillary.
In the above embodiment, the diameter of the G-lens GRIN 2 isThe section of the circumference is 0.24The height of the second long platform 5 is 0.3 mm.
in the above embodiment, the triangular surface of the corner right-angle prism 3 is an equilateral right-angle triangle of 0.7 × 0.7 mm.
in the above embodiment, two right-angle surfaces in the corner right-angle prism 3 are both plated with high antireflection film layers with corresponding operating wavelengths, and the sizes of the two right-angle surfaces are both 0.7 × 0.7 mm; the middle inclined plane end of the corner right-angle prism 3 is plated with a high reflection film layer with corresponding working wavelength.
in the above embodiment, a thick ceramic spacer 6 is arranged between the G-lens graded index lens 2 and the corner right-angle prism 3; the thick gasket is used as a gap for connecting the G-lens gradient index lens 2 and the corner right-angle prism 3, so that the direct contact between the G-lens gradient index lens 2 and the corner right-angle prism 3 is avoided, and the adhesive glue is prevented from overflowing into the light passing surface of the G-lens gradient index lens 2.
In the above embodiment, the height of the thick ceramic spacer 6 is 0.0775 mm.
In the above embodiment, the single-mode single-fiber collimator further includes an outer sealing tube 7, the single-mode single-fiber pigtail 1 and the G-lens graded index lens are wrapped in the outer sealing tube 7, the size of the outer sealing tube 7 is 1.2 × 5.5mm, and four small holes with an aperture of 1.11mm are disposed on the outer sealing tube 7.
The compact single-mode single-fiber collimator with low rotation beam deflection angle and high return loss in the embodiment can be used in an optical system with rotation requirements, can effectively save the operation space, and can fold the system into a smaller space; and can also be used in optical systems with strict beam deflection requirements. The method can be widely applied to the fields of optical network systems, multi-channel optical signal monitoring, optical switching connection systems, optical fiber debugging and measuring systems and the like.
the structure of the compact single-mode single-fiber collimator with low rotation angle and high return loss of the light beam in the above embodiment is as shown in fig. 3, and fig. 3 is a schematic structural diagram of the compact single-mode single-fiber collimator with low rotation angle and high return loss of the light beam; as can be seen from the figure, it comprises an 8-degree angleThe single-mode single-fiber tail fiber comprises a single-mode single-fiber tail fiber 1, wherein the length of the single-mode single-fiber tail fiber is 3 mm; a special designThe G-lens graded index lens 2, the angle of one end face in the lens is designed to be 3 degrees, and the peripheral pitch of the lens is designed to be 0.24; a ceramic gasket 6 with the thickness of 0.0775mm, a corner right-angle prism 3 with the thickness of 0.7 multiplied by 0.7mm and a special designThe four holes enclose the tube 7. The utility model relates to a rotatory single mode single optical fiber collimator of low deflection angle high return loss of compact light beam can turn light path, deflection angle less, and the return loss is higher, the encapsulation size is less, but the wide application is in the fiber communication field.
the compact single-mode single-fiber collimator with the light beam rotation, the low deflection angle and the high return loss has the advantages of capability of turning the light path, smaller deflection angle, higher return loss and smaller packaging size.
The compact single-mode single-fiber collimator with low beam rotation, low deflection angle and high return loss in the above embodiment can make the central optical axis of the optical system of the single-fiber collimator rotate 90 degrees, so that the beam passing through the optical system also has 90-degree turn, and the rotation angle can be changed differently according to the angle design of the corner right-angle prism, because the triangular surface in the corner right-angle prism is an equilateral right-angle triangle with 0.7 × 0.7mm, the rotation angle is 90 degrees, but in the embodiment, the beam deflection angle is smaller, wherein the included angle between the beam and the central optical axis of the optical system is smaller; leave the light beam of lens terminal surface outgoing and concentrate on near system center optical axis, contained angle between light beam and the optical system center optical axis obviously than the single fiber collimator among the prior art will be little, through the rotatory back of right angle prism 90 degrees, the light beam also is straight downwardly propagating (light beam and system center optical axis deflection degree and light beam rotation are two concepts, the utility model provides a single mode single fiber collimator makes the light beam deflection angle less, has nevertheless realized that the light beam that makes through this single mode single fiber collimator has 90 degrees turns), and this single mode single fiber collimator return loss is higher, and encapsulation size is less, and application scope is extensive.
The single-mode single-fiber pigtail 1 consists of a single-mode fiber and a branchSingle mode fiber capillary composition, as shown in figure 3,The length of the single-mode single-fiber tail fiber 1 is 3 mm. And 8-degree grinding and polishing are carried out on the end face of the tail fiber, an anti-reflection film layer with corresponding working wavelength is plated, and a small platform with the length of 0.3mm is made at the end of the 8-degree polishing inclined plane.
The G-lens graded index lens 2 is a specially designed lens, the design of the peripheral pitch is 0.24, and one of the flat ends is ground into a 3 degree angle inclined plane, and the inclined plane is a 0.3mm long small platform, as shown in fig. 3. The proper increase of the pitch is beneficial to reducing the deflection degree of the light beam; and the small platform can facilitate the butt joint of two inclined plane ends in the G-lens graded index lens 2 and the single-mode single-fiber tail fiber 1, and reduce the overflow of glue injection glue on the light passing planes of the two inclined plane ends of the G-lens graded index lens 2 and the single-mode single-fiber tail fiber 1.
Wherein, one plane of the G-lens gradient index lens is polished to be not an angle of 8 degrees or not an angle of 0 degree, and an angle of 3 degrees is selected. If the angle of 0 degree is selected, the deflection degree of the light beam is reduced. But cannot achieve high return loss in batch.
A ceramic gasket 6 with a thickness of 0.0775mm is used as a gap for connecting the G-lens GRIN lens 2 and the corner rectangular prism 3, so that the G-lens GRIN lens 2 and the corner rectangular prism 3 are prevented from directly contacting, and bonding glue is prevented from overflowing into the light-passing surface of the G-lens GRIN lens 2.
The inclined plane end of the corner right-angle prism 3 is plated with a high reflection film layer with corresponding working wavelength, the two right-angle surfaces are high reflection film layers with corresponding working wavelength, the size is 0.7 multiplied by 0.7mm,
The outer sealing tube 7 completely wraps the G-lens graded index lens and the single-mode single-fiber pigtail, is not exposed outside at all, and has the size of 1.2 multiplied by 5.5mm, four small holes are arranged on the metal outer sealing tube, and the aperture of each small hole is 1.1 mm. The four small holes are used for glue injection and bonding.
as shown in fig. 4, fig. 4 is the schematic diagram of the light path effect of the compact single-mode single-fiber collimator with low rotation angle and high return loss of light beam according to the present invention, and the path of light can be changed through the corner right-angle prism, so that the light path is turned.
As shown in fig. 5, the single-mode single fiber pigtail of the single-mode single fiber collimator in this embodiment has a first long platform with a height of 0.3mm (the platform height can be set more practically), the left half of fig. 5 is a front view of the single-mode single fiber pigtail, and the right half is a perspective view of the single-mode single fiber pigtail.
As shown in fig. 6, the G-lens graded index lens of the single-mode single-fiber collimator in this embodiment has a second long platform with a height of 0.3mm (the platform height can be set more practically), the left half of fig. 5 is a front view of the G-lens graded index lens, and the right half is a perspective view of the G-lens graded index lens.
The effective gain is as follows:
The utility model discloses a single optical fiber collimator of single mode of rotatory low deflection angle high return loss of compact light beam can make light beam rotation, deflection angle less, can reach to below 0.11 degree, the return loss is higher, can reach more than 65dB, outer seal pipe sizeThe whole packaging size is small and can reach the meterThe light path can be turned, the deflection angle is small, the return loss is high, and the packaging size is small.
The compact light beam of the utility model rotates and deflects in a low wayThe single-mode single optical fiber collimator with high angular return loss can be applied to a single mode with the wavelength of 1550nm and the collimation distance of 5mm (the single-mode optical fiber isOptical fiber), 5 mm's collimating distance, through corner right angle prism "folding" become with the working distance that horizontal optical system center optical axis becomes the vertical direction, the following table for using single optical fiber collimator among the prior art and the utility model discloses a rotatory low angle of deflection of compact light beam each parameter contrast table of single mode single optical fiber collimator of return loss:
From last table we can obviously see out the adoption the utility model discloses the difference of the single optical fiber collimator each parameter of the single optical fiber collimator that compact light beam rotation low deflection angle height return loss and adopt among the prior art can obviously be seen the utility model discloses the effective gain that compact light beam rotation low deflection angle high return loss's single optical fiber collimator brought.
The compact single-mode single-fiber collimator with low rotation angle and high return loss of light beams comprises a single-mode single-fiber tail fiber, a G-lens gradient index lens and a corner right-angle prism, wherein the single-mode single-fiber tail fiber is adjacent to the G-lens gradient index lens, and one end of the G-lens gradient index lens, which is not adjacent to the single-mode single-fiber tail fiber, is adjacent to the right-angle surface of the corner right-angle prism; the single-mode single-fiber collimator is adopted to enable the central optical axis of an optical system of the single-mode single-fiber collimator to rotate according to a preset angle, the central optical axis of the optical system is turned according to the preset angle through a corner right-angle prism in the single-mode single-fiber collimator, light beams passing through the optical system are turned according to the preset angle, the rotating angle can be changed differently according to different angle designs of the corner right-angle prism, the deflection angle of the light beams is smaller, and the included angle between the light beams and the central optical axis of the optical system is smaller; the light beams emitted from the end face of the lens are concentrated near the central optical axis of the system, the included angle between the light beams and the central optical axis of the optical system is obviously smaller than that of a single optical fiber collimator in the prior art, and the light beams are transmitted in the preset direction after being rotated by the angle set by the right-angle prism, so that the return loss is higher, the packaging size is smaller, and the application range is wide.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (10)
1. A compact single-mode single-fiber collimator with low rotation angle of light beams and high return loss is characterized in that the single-mode single-fiber collimator comprises a single-mode single-fiber tail fiber, a G-lens gradient index lens and a corner right-angle prism, the single-mode single-fiber tail fiber is adjacent to the G-lens gradient index lens, and one end of the G-lens gradient index lens, which is not adjacent to the single-mode single-fiber tail fiber, is adjacent to a right-angle surface of the corner right-angle prism;
The section angle of one end of the single-mode single-fiber pigtail, which is adjacent to the G-lens graded index lens, is 8 degrees;
The section angle of one end of the G-lens graded index lens, which is adjacent to the single-mode single-fiber tail fiber, is 3 degrees;
The upper half part of one end of the single-mode single-fiber tail fiber adjacent to the G-lens graded index lens is provided with a first long platform with the height smaller than the radius of the single-mode single-fiber tail fiber, and the lower half part of one end of the G-lens graded index lens adjacent to the single-mode single-fiber tail fiber is provided with a second long platform with the height smaller than the radius of the G-lens graded index lens.
2. The compact, low deflection angle, high return loss single mode fiber collimator of claim 1, wherein the gap distance between said single mode fiber pigtail and said G-lens graded index lens is between 0.06 mm and 0.12 mm.
3. The compact, low deflection angle, high return loss single mode single fiber collimator of claim 1, wherein said single mode single fiber pigtail has a diameter ofThe length is 3mm, and the height of the first long platform is 0.3 mm.
4. The compact, low deflection angle, high return loss single mode single fiber collimator of claim 3, wherein said single mode single fiber pigtail comprises an optical mode fiber and a fiber having a diameter ofThe optical mode fiber is positioned in the single mode fiber capillary.
5. The compact, low deflection angle, high return loss, single mode, single fiber collimator of claim 1, wherein said G-lens graded index lens has a diameter ofThe peripheral section is 0.24, and the height of the second long platform is 0.3 mm.
6. The compact, low deflection angle, high return loss, single mode, single fiber collimator of claim 1, wherein the triangular faces of said corner right angle prisms are equilateral right triangles of 0.7 x 0.7 mm.
7. The compact, low deflection angle, high return loss, single-mode, single-fiber collimator of claim 1, wherein both right-angled surfaces of said corner right-angle prism are coated with a high anti-reflection coating having a corresponding operating wavelength, and both said right-angled surfaces have dimensions of 0.7 x 0.7 mm; the middle inclined plane end of the corner right-angle prism is plated with a high reflection film layer with corresponding working wavelength.
8. The compact, low deflection angle, high return loss, single mode, single fiber collimator of claim 1, wherein a thick ceramic spacer is placed between said G-lens graded index lens and said corner cube.
9. the compact, low deflection angle, high return loss, single mode, single fiber collimator of claim 8, wherein said thick ceramic spacer has a height of 0.0775 mm.
10. The compact, low-deflection angle, high-return-loss single-mode single-fiber collimator of claim 1, further comprising an outer tube, wherein the single-mode single-fiber pigtail and the G-lens graded-index lens are enclosed in the outer tube, the outer tube has a size of 1.2 × 5.5mm, and the outer tube has four apertures with a diameter of 1.11 mm.
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| CN201920869748.3U CN209803383U (en) | 2019-06-11 | 2019-06-11 | Compact type single-mode single optical fiber collimator with low rotation angle and high return loss of light beam |
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