CN101344616B - Four-fiber optical fiber collimating device - Google Patents
Four-fiber optical fiber collimating device Download PDFInfo
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- CN101344616B CN101344616B CN2008101202607A CN200810120260A CN101344616B CN 101344616 B CN101344616 B CN 101344616B CN 2008101202607 A CN2008101202607 A CN 2008101202607A CN 200810120260 A CN200810120260 A CN 200810120260A CN 101344616 B CN101344616 B CN 101344616B
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Abstract
A four-fiber optical fiber collimator comprises a four-fiber optical fiber head, a graded index micro-lens and a connector; wherein, the four-fiber optical fiber head is composed of a four-aperture capillary and four optical fibers which are horizontally threaded through the four-aperture capillary; the four optical fibers are sequentially arranged from top to bottom on the same vertical face and the two optical fibers in the middle and the upper and lower optical fibers are respectively symmetric with the axis of the four-aperture capillary; the refractive index of the graded index micro-lens decreases monotonously from the optical axis to the edge as a parabola form and the refractive index is distributed axial-symmetrically; an incident end-face of the graded index micro-lens toward the optical fiber head includes a vertical plane section which is in the middle and is vertical to the optical axis and the upper and lower slant sections inclining to one end of the optical fiber head on two sides; the upper and lower slant sections are symmetrically arranged against the optical axis; an exit end-face of the graded index micro-lens is a plane which is vertical to the optical axis; the four-fiber optical fiber head and the graded index micro-lens are horizontally arranged in a coaxial manner through the connector.
Description
Technical field
The present invention relates to the optical fiber collimator that uses in a kind of optical fiber communication, relate in particular to a kind of four-fiber optical fiber collimating device that can be applicable in the optical add-drop multiplexer.
Background technology
Optical fiber collimator is an optical passive component commonly used in a kind of optical fiber communication.It can collimate the divergent beams of fiber end face outgoing by lenticule, or parallel or divergent beams are coupled in the single-mode fiber by lenticule with the external world.
The most frequently used optical fiber collimator is the single fiber collimating apparatus at present, as shown in Figure 1.101 is optical fiber among the figure, and 102 is that optical fiber 101 glues together the optical fiber head that constitutes with the optical fiber kapillary, and 103 is optical microlens, and it can be graded index (GRIN) lens (or claiming GRIN Lens), spherical lens or non-spherical lens.104 for being connected and fixed the sleeve pipe of optical fiber head 102 and optical microlens 103.Optical fiber head 102 exit facets and optical microlens 103 planes of incidence all are coated with antireflective film, and the optical axis of normal line of butt end and optical fiber has 6～12 ° inclination (being generally 8 °), to improve return loss.Optical fiber head 102 and optical microlens 103 are enclosed within sleeve pipe 104 the insides, accurately adjust the distance between optical fiber head 102 and the optical microlens 103, with the focus place that luminous point places optical microlens that goes out of optical fiber head.Optical fiber head 102, optical microlens 103 respectively with glue and sleeve pipe 104 gummeds, are promptly made the single fiber optical fiber collimator.The single fiber collimating apparatus also has another form, and it has removed the sleeve pipe 104 among Fig. 1, but with refractive index match glue that the plane of incidence of the exit facet of optical fiber head 102 and optical microlens 103 is bonding, to reach the effect that is connected and fixed.
Except above-mentioned single fiber collimating apparatus, in addition two fine collimating apparatuss commonly used, as shown in Figure 2.201 and 202 is optical fiber among the figure, and 203 is the optical fiber head of two unthreaded hole kapillary gummed formations of optical fiber 201 and 202 and one fixed intervals, and 204 is optical microlens, and it can be graded index (GRIN) lens, spherical lens or non-spherical lens.205 for being connected and fixed the sleeve pipe of optical fiber head 203 and optical microlens 204.Optical fiber head 203 exit facets and optical microlens 204 planes of incidence all are coated with antireflective film, and 6～12 ° inclination (being generally 8 °) is arranged, to improve return loss.Optical fiber 201 converges at the lenticule front end by the directional light that optical microlens 204 backs produce with the emergent light of optical fiber 202.Optical fiber head 203 and optical microlens 204 are enclosed within sleeve pipe 205 the insides, accurately adjust the distance between optical fiber head 203 and the optical microlens 204, the focus place that luminous point places optical microlens that goes out with optical fiber head, with optical fiber head 203, optical microlens 204 and sleeve pipe 205 gummeds, promptly make two fiber optical fiber collimating devices at last.
Optical fiber collimator is the important devices of making optical add-drop multiplexer.Chinese patent " optical add/drop multiplexer " (CN1481101A) in input, output with under dividing/insert port respectively to have used a single fiber optical fiber collimator.Two fine collimating apparatuss also can be used for making optical add-drop multiplexer, such as, 3 port CWDM products of 3 port add/drop filters of the OADM101A/D series of Oplink company, Browave company and Koncent company.But no matter be to use single fiber collimating apparatus or two fine collimating apparatuss to make optical add-drop multiplexers, its input, output, insertion and branch lower port must be positioned at the both sides of device, cause the device architecture size bigger than normal, the actual inconvenience of controlling.If use the single fiber collimating apparatus, because device increases, more can increase device assembling complexity, be difficult to guarantee serviceability.
Summary of the invention
For overcome existing optical fiber collimator technology integrated level when the structure optical add-drop multiplexer low, can not realize shortcoming such as one-sided port, the present invention proposes a kind of integrated level height when constructing optical add-drop multiplexer, can realize the four-fiber optical fiber collimating device of one-sided port.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of four-fiber optical fiber collimating device comprises a four-fiber optical fiber head, a graded index lenticule and a web member;
Described four-fiber optical fiber head is made of four optical fiber that four hole kapillaries and level are located in the described four hole kapillaries, described four optical fiber are arranged in order in same vertical plane from top to bottom, and middle two optical fiber are with two optical fiber are symmetrical up and down about axis capillaceous, described four holes respectively up and down;
The lenticular refractive index of described graded index descends according to parabolic type is dull from the optical axis to the edge, and refractive index distributes axisymmetricly, the lenticular incident end face of described graded index towards described optical fiber head comprise the perpendicular section vertical that be positioned at the middle part and both sides with optical axis towards the first end of described optical fiber tilt on, the lower inclined plane section, on described, the relative symmetrical of lower inclined plane section distributes, two optical fiber of described perpendicular section and above-mentioned centre are corresponding, on described, the lower inclined plane section is corresponding with above-mentioned up and down two optical fiber respectively, and the lenticular outgoing end face of described graded index is the plane vertical with optical axis;
Described four-fiber optical fiber head and graded index lenticule are coaxial horizontally disposed by web member.
As preferred a kind of scheme: described web member is for connecting described four-fiber optical fiber head and the lenticular sleeve pipe of graded index, and described four-fiber optical fiber head and graded index lenticule are glued in the described sleeve pipe.
Perhaps, described web member is exit facet and the bonding refractive index match glue of the lenticular plane of incidence of graded index with described optical fiber head.
Further, the normal of the outgoing end face of described four-fiber optical fiber head becomes 8 ° inclination angle with the optical axis of optical fiber, and described outgoing end face is coated with antireflective film, to improve return loss.
Preferably, the lenticular incident end face of described graded index is coated with antireflective film, to reduce echo.
Preferably, described four optical fiber are glued in the perforate capillaceous of described four holes.
The effect that the lenticular structural design of described graded index is reached is: the angle behind the light process graded index lenticule of two optical fiber outputs about in the described optical fiber head, the angle behind the light process graded index lenticule of two optical fiber outputs in the middle of comparing to is smaller.
Beneficial effect of the present invention mainly shows: when the present invention is used for optical add-drop multiplexer, the light path that can make input, output, branch descend and insert is all in same plane, thereby simplify the structure greatly, reduced the difficulty that mechanical hook-up is debug, and above-mentioned four ports all are positioned at the same side of optical add-drop multiplexer, not only reduce the physical dimension of optical add-drop multiplexer, also made things convenient for controlling of device; Adopt optical add-drop multiplexer of the present invention can realize leading directly to, divide down and inserting of wavelength simultaneously.
Description of drawings
Fig. 1 is a prior art single fiber optical fiber collimator structural representation.
Fig. 2 is the two fiber optical fiber collimating device structural representations of prior art.
Fig. 3 is the structural representation of four-fiber optical fiber collimating device of the present invention.
Fig. 4 is the lenticular structural representation of graded index of the present invention.
Fig. 5 is the structural representation that adopts optical add-drop multiplexer of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the present invention are further described.
Embodiment one
With reference to Fig. 3, a kind of four-fiber optical fiber collimating device comprises a four-fiber optical fiber head 305, a graded index lenticule 306 and a web member, and described four-fiber optical fiber head and graded index lenticule are coaxial horizontally disposed by web member.Described web member is for connecting described four-fiber optical fiber head and the lenticular sleeve pipe 307 of graded index, and described four-fiber optical fiber head 305 and graded index lenticule 306 are glued in the described sleeve pipe 307.
Described four-fiber optical fiber head 305 is made of four optical fiber 301,302,303,304 that four hole kapillaries and level are located in the described four hole kapillaries, described four optical fiber are glued in the perforate capillaceous of described four holes, described four optical fiber are arranged in order in same vertical plane from top to bottom, and middle two optical fiber are with two optical fiber are symmetrical up and down about axis capillaceous, described four holes respectively up and down.The normal of the outgoing end face of described four-fiber optical fiber head 305 becomes 8 ° inclination angle with the optical axis of optical fiber, and described outgoing end face is coated with antireflective film, to improve return loss.
Described graded index lenticule 306 is the lens through particular design, and its refractive index descends according to parabolic type is dull from the optical axis to the edge, and refractive index distributes axisymmetricly.The lenticular incident end face towards optical fiber head of described graded index comprises the upper and lower bevel phase that tilts towards the first end of described optical fiber of the perpendicular section vertical with optical axis that be positioned at the middle part and both sides, described upper and lower bevel phase becomes respectively with optical axis ± (90 °-θ) angle and relative symmetrical distribute, described perpendicular section is corresponding with middle two optical fiber, and two optical fiber are corresponding respectively with up and down for described upper and lower bevel phase.The lenticular incident end face of described graded index is coated with antireflective film, to reduce echo.The lenticular outgoing end face of described graded index is a plane vertical with optical axis.
Among Fig. 3, middle two optical fiber 302 converge at graded index lenticule front end with 303 the emergent light directional light by 306 generations of graded index lenticule, and its angle is 2 α.Two optical fiber 301 and 304 emergent light converge at graded index lenticule front end by the directional light that graded index lenticule 306 produces up and down, and its angle is 2 β.Described graded index lenticule guarantees 2 α〉2 β.Optical fiber head 305 and graded index lenticule 306 are enclosed within sleeve pipe 307 the insides, accurately adjust the distance between optical fiber head 305 and the graded index lenticule 306, with optical fiber head 305, graded index lenticule 306 and sleeve pipe 307 gummeds, promptly make four-fiber optical fiber collimating device of the present invention at last.
With reference to Fig. 4, the round bar shape graded index lenticule that graded index lenticule of the present invention is r by a radius processes.The left side be the lens incident end face among Fig. 4, and its center is one and highly is 2h, the plane vertical with optical axis, up and down both sides for to become respectively with optical axis ± (90 °-θ) plane at pitch angle.Lens center axial length z.With reference to Fig. 3 and Fig. 4, tiltangle is that (abcd matrix by gradual index lens calculates as can be known than middle two-way light little for angle when making that two-way light is from the outgoing of graded index lenticule up and down, as there is not a tiltangle, the emergent ray angle must be greater than the intermediate rays angle up and down), concrete little what can control by length z.After z determines, can obtain described optical fiber head apart from the lenticular optimum distance of graded index through the lenticular transformation calculations of graded index by Gaussian beam.The selection of height 2h need consider that mainly the overlapping phenomenon does not take place four road light beams that entered by optical fiber head in the graded index lenticule.It is enough big that radius r is wanted, to guarantee that light can not reflect at periphery about the graded index lenticule up and down.
With reference to Fig. 5, adopt the optical add-drop multiplexer of four-fiber optical fiber collimating device of the present invention, comprise four-fiber optical fiber collimating device of the present invention, dielectric multi-layer optical thin film wave filter 308 and catoptron 309.Four optical fiber are followed successively by from top to bottom and insert optical fiber 301, input optical fibre 302, output optical fibre 303, divide optical fiber 304 down, in order to transmission send into (from) insertion of graded index lenticule 306 and input (output and divide down) signal.
Described graded index lenticule 306 utilizes the structure and the optical characteristics of its particular design, can guarantee that the ray trajectory under above-mentioned insertion, input, output and the branch all is positioned at same plane.
Incide the plated film face of described dielectric multi-layer optical thin film wave filter 308 through the input signal behind the graded index lenticule 306 with special angle, the light wave of its reflection is as through connect signal.Through the insertion signal transmission from described dielectric multi-layer optical thin film wave filter 308 behind the graded index lenticule 306, incide on the catoptron 309, the light wave of its reflection overlaps with above-mentioned through connect signal by dielectric multi-layer optical thin film wave filter 308 backs once more, form output signal, enter then in the described graded index lenticule 306 and propagate, until spreading into output optical fibre 303.As dividing signal down, the described catoptron 309 of directive, its reflecting light by behind the wave filter 308, are injected described graded index lenticule 306 once more through the input lightwave signal of wave filter 308 transmissions, divide the optical fiber 304 of function down until spreading into to carry out.
Embodiment two
The difference of present embodiment and embodiment one is that described web member is exit facet and the bonding refractive index match glue of the lenticular plane of incidence of graded index with described optical fiber head.Other structures of present embodiment and implementation and embodiment one are identical.
Claims (6)
1. a four-fiber optical fiber collimating device is characterized in that: comprise a four-fiber optical fiber head, a graded index lenticule and a web member;
Described four-fiber optical fiber head is made of four optical fiber that four hole kapillaries and level are located in the described four hole kapillaries, described four optical fiber are arranged in order in same vertical plane from top to bottom, and middle two optical fiber are with two optical fiber are symmetrical up and down about axis capillaceous, described four holes respectively up and down;
The lenticular refractive index of described graded index descends according to parabolic type is dull from the optical axis to the edge, and refractive index distributes axisymmetricly, the lenticular incident end face of described graded index towards described optical fiber head comprise the perpendicular section vertical that be positioned at the middle part and both sides with optical axis towards the first end of described optical fiber tilt on, the lower inclined plane section, on described, the relative symmetrical of lower inclined plane section distributes, two optical fiber of described perpendicular section and above-mentioned centre are corresponding, on described, the lower inclined plane section is corresponding with above-mentioned up and down two optical fiber respectively, and the lenticular outgoing end face of described graded index is the plane vertical with optical axis;
Described four-fiber optical fiber head and graded index lenticule are coaxial horizontally disposed by web member.
2. four-fiber optical fiber collimating device as claimed in claim 1 is characterized in that: described web member is for connecting described four-fiber optical fiber head and the lenticular sleeve pipe of graded index, and described four-fiber optical fiber head and graded index lenticule are glued in the described sleeve pipe.
3. four-fiber optical fiber collimating device as claimed in claim 1 is characterized in that: described web member is exit facet and the bonding refractive index match glue of the lenticular plane of incidence of graded index with described optical fiber head.
4. as claim 2 or 3 described four-fiber optical fiber collimating devices, it is characterized in that: the normal of the outgoing end face of described four-fiber optical fiber head becomes 8 ° inclination angle with the optical axis of optical fiber, and described outgoing end face is coated with antireflective film, to improve return loss.
5. four-fiber optical fiber collimating device as claimed in claim 4 is characterized in that: the lenticular incident end face of described graded index is coated with antireflective film, to reduce echo.
6. four-fiber optical fiber collimating device as claimed in claim 5 is characterized in that: described four optical fiber are glued in the perforate capillaceous of described four holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101202607A CN101344616B (en) | 2008-08-14 | 2008-08-14 | Four-fiber optical fiber collimating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101202607A CN101344616B (en) | 2008-08-14 | 2008-08-14 | Four-fiber optical fiber collimating device |
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| Publication Number | Publication Date |
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| CN101344616A CN101344616A (en) | 2009-01-14 |
| CN101344616B true CN101344616B (en) | 2010-08-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8929700B2 (en) * | 2011-04-23 | 2015-01-06 | Optoplex Corporation | Single-package dual optical-function device |
| JP2019191260A (en) * | 2018-04-19 | 2019-10-31 | 住友電気工業株式会社 | Coherent light reception module |
| CN111381329A (en) * | 2020-04-07 | 2020-07-07 | 武汉电信器件有限公司 | Coupling adapter |
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