CN202837615U - Light receiving and transmitting device with novel optical filter - Google Patents
Light receiving and transmitting device with novel optical filter Download PDFInfo
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- CN202837615U CN202837615U CN 201220506261 CN201220506261U CN202837615U CN 202837615 U CN202837615 U CN 202837615U CN 201220506261 CN201220506261 CN 201220506261 CN 201220506261 U CN201220506261 U CN 201220506261U CN 202837615 U CN202837615 U CN 202837615U
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Abstract
The utility model provides a light receiving and transmitting device with a novel optical filter. The light receiving and transmitting device with the novel optical filter comprises a main body, a fiber inserting core, a light emitting assembly, a light receiving assembly and a optical filter, wherein the light emitting assembly is opposite to the fiber inserting core and are in the same axle. Light beams emitted by the light emitting assembly penetrate through the optical filter and inject in the fiber inserting core. Light beams emitted by the fiber inserting core are reflected by the optical filter and insert in the light receiving assembly. A first surface of the optical filter faces the light emitting assembly in an inclination mode and the second surface of the optical filter faces the light receiving assembly and the fiber inserting core in an inclination mode. A first declination angle c does not equals to the second declination angle e, wherein the first declination angle c is formed by the first surface and the central axis of the fiber inserting core, and the second declination angle e is formed by the second surface and the central axis of the fiber inserting core. The light receiving and transmitting device with the novel optical filter has the advantages that the optical filter is placed in the light receiving and emitting device, wherein inclination angles of two side surfaces are unequal. The optical filter compensates angular deflection of light rays emitted on the fiber inserting core. Coupling efficiency is improved, and meanwhile production and assembly are simple.
Description
Technical field
The utility model relates to the Optical Fiber Transmission field, relates in particular to a kind of optical transceiving device.
Background technology
Along with popularizing of Fiber to the home FTTH (Fiber TO The Home), the simplex optical module demand for low profile thermal plug encapsulation on the market progressively increases, but the market cost pressure that gives optical module is also strengthening simultaneously.For example, as the Primary Component of EPON (Ethernet Passive Optical Network) and GPON (Gigabit Passive Optical Network) optical module, single-fiber bidirectional optical device (BOSA) has occupied more than 60% of optical module cost.Therefore, the cost that how to reduce optical device becomes the most important thing of optical module manufacturer.
At present, the optical device manufacturer main method of falling this is the LD TO(Laser Diode Transistor Outline that reduces in the PON optical device) cost.And the approach that reduces LD TO cost mainly is that non-globe lens is changed to globe lens.Yet usually, the coupling efficiency of non-globe lens can reach more than 30%, and globe lens is generally 20%, and both differ and reach more than 10%, the key factor during this just makes coupling efficiency become in the low-cost PON optical device and design, produces.Therefore, adopt low-cost LD TO, globe lens LD TO namely, how the Effective Raise coupling efficiency become research and development and produce in key factor.
Take traditional GPON optical transceiving device as example, as shown in Figure 1, it comprises body 101, fiber stub 102, the PD TO(Photodiode Detector of receiving end) optical fiber receive module 103, the LD TO light emission component 104 of making a start, the optical filter 105 of setting at 45 °.Its basic functional principle is: emergent light sends from light emission component 104, directly sees through 45 ° of optical filters 105, is received by fiber stub 102; Inject from fiber stub 102 and receive light, reflect into into optical fiber receive module 103 through 45 ° of optical filters 105.
Present industry, generally adopt following method to improve coupling efficiency:
Method 2, as shown in Figure 4, optical transceiving device basic structure and aforementioned conventional GPON optical transceiving device in the method are similar, has body 401, fiber stub 402, optical fiber receive module 403, light emission component 404 and optical filter 405, the difference of it and conventional optical transceivers part be according to the certain angle assemble welding with fiber stub 202 and body 401.Find out that easily this ratio juris is similar to method 1.The shortcoming of this method is, lock pin and body need according to the certain angle assembling in the production run, to personnel and folder, tool require highly, simultaneously harsh requirement is proposed also laser welding system, be unfavorable for producing.
Method 3 as mentioning in patent US2012/0148257A1, adopts light emission component and body to improve coupling efficiency according to the method for special angle assembling.Similarly, also there be the drawback identical with method 2, harsh to manufacturing technique requirent, be not easy to realization.
The utility model content
Technical problem to be solved in the utility model is, a kind of novel filter that has is provided, and can improve coupling efficiency, and simplifies the optical transceiving device of production operation.
The purpose of this utility model is by providing following a kind of optical transceiving device to realize:
A kind of optical transceiving device with novel filter comprises: body; Fiber stub, an end is arranged in body; Light emission component, at least part of body that is arranged in, the coaxial setting relative to fiber stub of described light emission component; Optical fiber receive module, at least part of body that is arranged in; Optical filter, be obliquely installed between fiber stub and light emission component, the light beam that described light emission component sends passes described optical filter and injects fiber stub, the light beam that described fiber stub sends is injected optical fiber receive module after being reflected by described optical filter, the vertical line of the axis of the relative fiber stub of receipts light end face of the optical fiber in the fiber stub is θ with an angle, this angle θ causes the light deflection certain angle a of incident, the first surface of described optical filter tilt towards described light emission component, the second face tilt towards described optical fiber receive module and described fiber stub, the first drift angle c that the axis of described first surface and fiber stub becomes is not equal to described second the second drift angle e that becomes with the axis of described fiber stub, and the first drift angle c and the second drift angle e are so that the light that light emission component sends after filtration after the mating plate, and deviation angle a projects on the fiber stub.
Preferably, described the second drift angle e calculates according to following formula: a+e=90 °-e.
Preferably, described the first drift angle c obtains according to following formula batch total: sin (45-a)=n2*sin (b); E-c=d-b; Sin (90-c)=n2*sin (d); The angle that the angle d angle that is after light that light emission component sends enters optical filter and deflection, becomes with the vertical line of first surface wherein, angle b be after aforementioned light enters optical filter and deflection, become with second vertical line, n2 is the refractive index of optical filter.
Preferably, described angle θ is 8 degree, and angle a is 3.79 degree.
Preferably, described the second drift angle e is 43.1 degree.
The beneficial effects of the utility model are mainly reflected in: by the optical filter that does not wait at the angle of inclination that two sides are set in optical transceiving device, the angular deflection of the light of compensate for emission to the fiber stub, when having improved coupling efficiency, produce and assembling simple.
Description of drawings
Fig. 1 is traditional GPON optical transceiving device structural drawing.
Fig. 2 is the optical transceiving device structural drawing of method 1 in the prior art.
Fig. 3 is the schematic diagram of method 1 in the prior art.
Fig. 4 is the optical transceiving device structural drawing of method 2 in the prior art.
Fig. 5 is the First Principle figure of the utility model embodiment.
Fig. 6 is the second schematic diagram of the utility model embodiment.
Embodiment
Embodiment of the present utility model provides a kind of optical transceiving device with novel filter, similar with existing optical transceiving device, it comprises body, and is installed in the fiber stub on the body or in the body, light emission component, optical fiber receive module and optical filter.Concrete, the setting that fiber stub is relative with light emission component is arranged at respectively the two ends of body, and equal at least part of bodies that enters into, the preferred coaxial setting of fiber stub and light emission component, and namely their axis overlaps.Optical filter is positioned at them between the two, is obliquely installed.The same at least part of body that enters into of optical fiber receive module, but be arranged on a side of body, it is located axially between fiber stub and the light emission component fiber stub and light emission component, and the axis perpendicular direction of self axis direction of optical fiber receive module and fiber stub.
Optical transceiving device can be realized the transmitted in both directions of light signal.The light that light emission component sends enters into fiber stub after the mating plate after filtration, and after filtration mating plate reflection of the optical fiber that fiber stub sends, the deflection miter angle enters in the optical fiber receive module.
Such as Fig. 5, optical filter 505 has first surface 511 and second 512, first surface 511 tilt towards light emission component, the second face tilt towards optical fiber receive module.In the present embodiment, the first surface of optical filter and second are not parallel, and the first drift angle c that the axis of first surface 511 and light emission component becomes is not equal to 45 degree, and the second drift angle e that becomes with the axis of fiber stub for second 512 also is not equal to 45 and spends.
Foregoing, the vertical line of the axis of the relative fiber stub of receipts light end face of the optical fiber in the fiber stub is θ with an angle, angle θ is between 6 degree are spent to 10, this angle θ can cause the light deflection certain angle a of incident, thereby cause coupling efficiency to reduce, this deflection angle a is between 3 degree are spent to 5.Angle θ industry is set to 8 degree usually, and deflection angle a is 3.79 degree.
Such as Fig. 6, the ray cast that from fiber stub, penetrates to second 512 of optical filter 505 after, need as requested to impinge perpendicularly in the optical fiber receive module, the axis of optical fiber receive module is perpendicular to the axis of fiber stub, therefore, can obtain a+e=90 °-e by the reflection law in the geometrical optics, namely when a be 3.79 when spending, the second drift angle e 43.1 can meet the demands when spending.
The defective that reduces in order to overcome aforesaid coupling efficiency, embodiment of the present utility model is by reaching for the first surface 511 of optical filter 505 arranges specific the first drift angle c, the light that sends from light emission component is after filtration after the mating plate 505, be offset an aforesaid deflection angle a and project on the fiber stub, this angle a is so that enter the types of fiber of fiber stub and be similar to from the fiber stub of flush end and inject.
Below introduce the selection mode of the first drift angle c.
Such as Fig. 5, the angle that the first drift angle c becomes with first surface for the light that sends from light emission component; Angle d is for after this light enters optical filter 505 and deflection, the angle that becomes with the vertical line of first surface; Angle b is for after this light enters optical filter 505 and deflection, the angle that becomes with second vertical line; As previously mentioned, angle a is that the end face inclination angle of fiber stub is when being angle θ, the deflection angle of incident ray, thereby accordingly when incident ray is injected along light lock pin axis, needed fiber stub angle of incidence of light, in Fig. 5, that is to say this light after second ejaculation of optical filter 505, the angle that becomes with its original orientation that light penetrates from light emission component.
Can be got by Fresnel law:
sin(45-a)=n2*sin(b) (1)
Can be got by geometric relationship,
e-c=d-b (2)
By Fresnel law, there is following relation on the left side of optical filter as can be known again:
sin(90-c)=n2*sin(d) (3)
Based on above three formulas, can obtain the first drift angle c that optical filter first surface corresponding when light deflection angle a becomes with the light that sends from light emission component.
The advantage of this method is directly to change the direction of light that penetrates from light emission component by space optics, to reach the raising of coupling efficiency.
According to this embodiment of the present utility model, can be easy to as follows carry out the manufacturing of optical transceiving device, this manufacture method may further comprise the steps:
One body is provided;
At body one fiber stub is installed, is made an end of fiber stub be arranged in body, the vertical line of the axis of the relative fiber stub of receipts light end face of the optical fiber in the fiber stub is θ with an angle, and this angle θ causes the light deflection certain angle a of incident;
At body one light emission component is installed, is made light emission component coaxial arrangement relative to fiber stub;
At body one optical fiber receive module is installed;
One optical filter is installed in body, optical filter tilt between fiber stub and light emission component, so that the first surface of this optical filter tilt towards described light emission component, the second face tilt towards described optical fiber receive module and described fiber stub, the first drift angle c that the axis of described first surface and light emission component becomes is not equal to described second the second drift angle e that becomes with the axis of described fiber stub, and so that the first drift angle c and the second drift angle e be so that the light that light emission component sends after filtration after the mating plate, deviation angle a projects on the fiber stub.
Wherein, further comprising the steps of, according to formula a+e=90 °-e, calculate the value of the first drift angle e.
Wherein, further comprising the steps of, according to following formula group, calculate the value of the first drift angle c, sin (45-a)=n2*sin (b); E-c=d-b; Sin (90-c)=n2*sin (d); The angle that the angle d angle that is after light that light emission component sends enters optical filter and deflection, becomes with the vertical line of first surface wherein, angle b be after aforementioned light enters optical filter and deflection, become with second vertical line, n2 is the refractive index of optical filter.
By above-mentioned mode, in the production of reality, just can produce like this and assemble by the optical filter set-up mode that need simply data substitution formula to be obtained,, can improve coupling efficiency.Compare existing method, this method very big simple and easy production technology has reduced the requirement of anchor clamps, tool.
The utility model is not limited to aforementioned embodiments; those skilled in the art are under the enlightenment of the utility model technical spirit; also may make other changes, but as long as function and the utility model of its realization are same or similar, all should belong to protection domain of the present utility model.
Claims (5)
1. the optical transceiving device with novel filter comprises: body; Fiber stub, an end is arranged in body; Light emission component, at least part of body that is arranged in, the coaxial setting relative to fiber stub of described light emission component; Optical fiber receive module, at least part of body that is arranged in; Optical filter, be obliquely installed between fiber stub and light emission component, the light beam that described light emission component sends passes described optical filter and injects fiber stub, the light beam that described fiber stub sends is injected optical fiber receive module after being reflected by described optical filter, the vertical line of the axis of the relative fiber stub of receipts light end face of the optical fiber in the fiber stub is θ with an angle, this angle θ causes the light deflection certain angle a of incident, it is characterized in that, the first surface of described optical filter tilt towards described light emission component, the second face tilt towards described optical fiber receive module and described fiber stub, the first drift angle c that the axis of described first surface and fiber stub becomes is not equal to described second the second drift angle e that becomes with the axis of described fiber stub, and the first drift angle c and the second drift angle e are so that the light that light emission component sends after filtration after the mating plate, and deviation angle a projects on the fiber stub.
2. a kind of optical transceiving device with novel filter according to claim 1 is characterized in that, described the second drift angle e calculates according to following formula: a+e=90 °-e.
3. a kind of optical transceiving device with novel filter according to claim 2 is characterized in that, described the first drift angle c obtains according to following formula batch total: sin (45-a)=n2*sin (b); E-c=d-b; Sin (90-c)=n2*sin (d); The angle that the angle d angle that is after light that light emission component sends enters optical filter and deflection, becomes with the vertical line of first surface wherein, angle b be after aforementioned light enters optical filter and deflection, become with second vertical line, n2 is the refractive index of optical filter.
4. arbitrary described a kind of optical transceiving device with novel filter in 3 according to claim 1 is characterized in that, described angle θ is 8 degree, and angle a is 3.79 degree.
5. arbitrary described a kind of optical transceiving device with novel filter in 3 according to claim 1 is characterized in that, described the second drift angle e is 43.1 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220506261 CN202837615U (en) | 2012-09-29 | 2012-09-29 | Light receiving and transmitting device with novel optical filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220506261 CN202837615U (en) | 2012-09-29 | 2012-09-29 | Light receiving and transmitting device with novel optical filter |
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| CN202837615U true CN202837615U (en) | 2013-03-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879875A (en) * | 2012-09-29 | 2013-01-16 | 苏州海光芯创光电科技有限公司 | Optical transceiving device with novel filter and method for manufacturing optical transceiving device |
| CN111239923A (en) * | 2020-02-11 | 2020-06-05 | 青岛海信宽带多媒体技术有限公司 | Optical module |
-
2012
- 2012-09-29 CN CN 201220506261 patent/CN202837615U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879875A (en) * | 2012-09-29 | 2013-01-16 | 苏州海光芯创光电科技有限公司 | Optical transceiving device with novel filter and method for manufacturing optical transceiving device |
| CN111239923A (en) * | 2020-02-11 | 2020-06-05 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20130327 Termination date: 20180929 |
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| CF01 | Termination of patent right due to non-payment of annual fee |