CN1207590C - Miniaturized multiplexer with low sensitivity of temperature effect for adding and taking light - Google Patents
Miniaturized multiplexer with low sensitivity of temperature effect for adding and taking light Download PDFInfo
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- CN1207590C CN1207590C CN 02121751 CN02121751A CN1207590C CN 1207590 C CN1207590 C CN 1207590C CN 02121751 CN02121751 CN 02121751 CN 02121751 A CN02121751 A CN 02121751A CN 1207590 C CN1207590 C CN 1207590C
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- refractive index
- multiplexer
- gradually changed
- index lens
- gasket ring
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- 230000002277 temperature effect Effects 0.000 title abstract description 11
- 230000035945 sensitivity Effects 0.000 title abstract 2
- 239000003822 epoxy resin Substances 0.000 claims abstract description 36
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 36
- 239000011521 glass Substances 0.000 claims description 47
- 239000004568 cement Substances 0.000 claims description 18
- 239000013307 optical fiber Substances 0.000 claims description 12
- 230000008646 thermal stress Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 230000003287 optical effect Effects 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract 2
- 238000007711 solidification Methods 0.000 abstract 2
- 239000011230 binding agent Substances 0.000 abstract 1
- 230000008859 change Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Abstract
The present invention relates to a miniature multiplexer with low sensitivity to temperature effect for adding and taking light. The multiplexer is connected between optical elements by a hollow shim ring, and is engaged with the optical elements through binding agents such as heat solidification epoxy resin or ultraviolet light solidification epoxy resin, etc. The multiplexer compensates the band-pass central wavelength temperature drift effect of a filter plate because of thermal stress by controlling the thermal expansion coefficient of the hollow shim ring within a specific range. The miniature multiplexer with stable performance for adding and taking light is obtained.
Description
Technical field
The present invention relates to a kind of multiplexer for adding and taking light, refer to a kind of miniaturization multiplexer for adding and taking light especially.
Background technology
Because the universalness of world-wide web, the user also promotes day by day for the requirement of network on-line speed, and therefore, the heavy demand of network on-line frequency range (bandwidth) is the emphasis of network on-line breakthrough that technology is desired most ardently.With current techniques, (Wavelength DivisionMultiplexing, WDM) technology is present economy the most and the method that effectively solves the frequency range problem to the fiber optic wavelength multiplex (MUX).In the WDM technology, used always by the people with filter plate type WDM module, and filter plate type WDM module is made of a multiplexer for adding and taking light (Add-Drop Multiplexer).
Known technology proposes multiple different structure to multiplexer for adding and taking light.For example, Fig. 1 has shown a kind of sectional view of known multiplexer for adding and taking light.As shown in Figure 1, this known multiplexer for adding and taking light 1 comprises one first glass lasso (glass ferrule) 2, a pair of optical fiber 3a, 3b, one first gradually changed refractive index lens (GRIN lens), 4, one filter plate 5, one second gradually changed refractive index lens 6, one second glass lasso 7 and another optical fiber 3c.Wherein, the first glass lasso 2 has a hole 2a, and in this hole 2a a pair of optical fiber 3a, 3b is set.Then, by a cement, for example the ultraviolet cured epoxy resin 8, and the edge of the end face 4a of the edge of the end face 2b of the first glass lasso 2 and the first gradually changed refractive index lens 4 is bonding; Simultaneously, by a cement, for example heat-curable epoxy resin 9, and the other end 4b of the filter plate 5 and the first gradually changed refractive index lens 4 is bonding.Then, the above-mentioned second glass lasso 7 has a hole 7a, and in this hole 7a an optical fiber 3c is set.Then, by ultraviolet cured epoxy resin 8 that the edge of the end face 6a of the edge of the end face 7b of the above-mentioned second glass lasso 7 and the second gradually changed refractive index lens 6 is bonding; And it is the other end 6b of the above-mentioned filter plate 5 and the second gradually changed refractive index lens 6 is bonding by heat-curable epoxy resin 9.
Yet in the above-mentioned known multiplexer for adding and taking light, heat-curable epoxy resin makes heat-curable epoxy resin stop light path between meeting rarefaction liquid state after the heating and then infiltration filter plate and gradually changed refractive index lens, and reduces signal intensity.
For this reason, a kind of miniaturization multiplexer for adding and taking light has been proposed to avoid the problems referred to above in the known technology.See also Fig. 2, so that the structure of known miniaturization multiplexer for adding and taking light to be described.This known miniaturization multiplexer for adding and taking light 100 is disclosed in number No. 90125812 patent of invention of application case that the same applicant of the present invention proposes, comprises one first glass lasso 10, one first gradually changed refractive index lens 20, one first gasket ring 31, one second gasket ring 32, a filter plate 40, one second gradually changed refractive index lens 25, one second glass lasso 15, one the 3rd gasket ring 33 and one the 4th gasket ring 34.The first glass lasso 10 has a hole 11, and in this hole 11 setting-a pair of optical fiber 51,52.The second glass lasso 15 has a hole 16, and in this hole 16 optical fiber 53 is set.
Then, by a cement, for example heat-curable epoxy resin 9, first gasket ring 31 are adhered to an end face 21 of the first gradually changed refractive index lens 20.Further, by heat-curable epoxy resin 9 the first glass lasso 10 is adhered on first gasket ring 31.Then, by heat-curable epoxy resin 9 second gasket ring 32 is adhered on the other end 22 of the first gradually changed refractive index lens 20.Further, by heat-curable epoxy resin 9 filter plate 40 is adhered on second gasket ring 32.Therefore, has both gap 70 of set a distance between the first glass lasso 10 and the first gradually changed refractive index lens 20.
Then, by heat-curable epoxy resin 9 the 3rd gasket ring 33 is adhered to an end face 26 of the second gradually changed refractive index lens 25.Further, by heat-curable epoxy resin 9 the second glass lasso 15 is adhered on the 3rd gasket ring 33.Then, by heat-curable epoxy resin 9 the 4th gasket ring 34 is adhered on the other end 27 of the second gradually changed refractive index lens 25.Further, by heat-curable epoxy resin 9 filter plate 40 is adhered on the 4th gasket ring 34.Therefore, has another both gap 71 of set a distance between the second glass lasso 15 and the second gradually changed refractive index lens 25.Above-mentioned known miniaturization multiplexer for adding and taking light must be set up in said structure one adjusting mechanism and adjust, to obtain preferable reflected light beam signal before the heat-curable epoxy resin between glass lasso and the gradually changed refractive index lens is uncured.
Above-mentioned known miniaturization multiplexer for adding and taking light can be guaranteed can not infiltrate after heat-curable epoxy resin heats the gap between gradually changed refractive index lens and the filter plate, and make the obvious miniaturization of multiplexer for adding and taking light volume owing to used the gasket ring 31～34 of hollow.Yet why filter disc type multiplexer for adding and taking light can allow the logical centre wavelength of the band of different bandwidth penetrate, and depends on the film design of filter plate.By the rete storehouse of the high low-refraction of difference, and allow different wavelength to penetrate.When WDM technology is come more arrowband frequency range (ultra-nsrrow bandpass), (Channel Spacing) is the multiplexer for adding and taking light of 50GHz as the frequency band spacing, and this moment, ambient temperature promptly determined the stability of multiplexer for adding and taking light to the influence that is caused with logical centre wavelength.In the above-mentioned known miniaturization multiplexer for adding and taking light and since the material of employed hollow gasket ring 31～34 with bonding filter plate 40 and first and second glass lasso 10,15 all inequality, therefore when variation of ambient temperature, be easy to be affected.
Seeing also Fig. 3, is example with the gasket ring in the miniaturization multiplexer for adding and taking light 30 with filter plate 40, and the temperature effect that produces because of temperature change is described.40 of filter plates are as a membrane structure (label 41 as shown in Figure 3).Membrane stress can be divided into two kinds, and a kind of is that the structure of film itself causes, and is called internal stress; Another kind is a thermal stress, produces difference because of thermal expansivity is different during promptly by temperature change and shrinks the stress that caused.As shown in Figure 3, if a gasket ring 30 is with a cement, when for example heat-curable epoxy resin 9 is adhered on the filter plate 40, because gasket ring 30 is different with the thermal expansivity of filter plate 40, therefore may produce the compressive stress 60 shown in the arrow of Fig. 3, or opposite tension stress.When thermal stress takes place, promptly can logical centre wavelength impact the band of multiplexer for adding and taking light, produce so-called temperature drift effect.
The drift effect that the logical centre wavelength of the band of filter plate produces because of temperature variation is mainly from several factors.The thickness of periodicity thin layer and thin-film refractive index vary with temperature the logical centre wavelength drift of the band that is caused, especially periodically the change obvious effect of thin layer thickness on the first filter plate.It two is carrying glass substrates of thin layer periodically on the filter plate, with thin layer because of the formed horizontal thermal stress of material thermal expansion coefficient difference, the thermal stress that causes because of temperature variation makes has different compressions or outer strength of opening between glass substrate and thin layer, cause periodically thin layer thickness change, the band of also related change filter plate leads to centre wavelength.Its three, be attached to the hollow gasket ring in filter plate front and thin layer because of the formed horizontal thermal stress of material thermal expansion coefficient difference, change the logical centre wavelength of band of filter disc too.Wherein first and second is the problem that filter plate will face when making, and for the user, the 3rd factor then is the purpose that can be reached improvement by encapsulation procedure.Therefore, by the thermal expansivity of suitable selection hollow gasket ring, but the suffered thermal stress of compensating for periodic thin layer, and then the logical centre wavelength of band that reduces multiplexer for adding and taking light varies with temperature and the phenomenon that changes.
Summary of the invention
In view of this, the technical problem to be solved in the present invention provides a kind of miniaturization multiplexer for adding and taking light low to temperature effect susceptibility, can have the advantage of known miniaturization multiplexer for adding and taking light concurrently, reduce because of temperature effect makes the logical centre wavelength of band of multiplexer for adding and taking light producing the phenomenon of drift simultaneously.
In order to solve above technical matters, the present invention discloses a kind of miniaturization multiplexer for adding and taking light, comprises: one first glass lasso has one first hole and is arranged at the interior a pair of optical fiber of this first hole; One first gradually changed refractive index lens have one first end face and one second end face, and this first end face engages with this first glass lasso, wherein form both gap of set a distance between this first glass lasso and this first gradually changed refractive index lens; One second glass lasso has one second hole and is arranged at the interior optical fiber of this second hole; One second gradually changed refractive index lens have one the 3rd end face and one the 4th end face, and the 3rd end face engages with this second glass lasso, wherein form another both gap of set a distance between this second glass lasso and this second gradually changed refractive index lens; One filter plate is arranged between these first gradually changed refractive index lens and this second gradually changed refractive index lens, respectively with this second end face and the 4th end joined; One first gasket ring is arranged between these first gradually changed refractive index lens and this filter plate, and this first gasket ring is adhered to this second end face of this filter plate and these first gradually changed refractive index lens by a cement; One second gasket ring is arranged between these second gradually changed refractive index lens and this filter plate, and this second gasket ring is adhered to the 4th end face of this filter plate and these second gradually changed refractive index lens by this cement; One the 3rd gasket ring is arranged between these first gradually changed refractive index lens and this first glass lasso, and the 3rd gasket ring is adhered to this first end face of this first glass lasso and these first gradually changed refractive index lens by this cement; And one the 4th gasket ring, being arranged between these second gradually changed refractive index lens and this second glass lasso, the 4th gasket ring is adhered to the 3rd end face of this second glass lasso and these second gradually changed refractive index lens by this cement.Wherein, the thermal expansivity of the first, second, third and the 4th gasket ring is preferable between 3.0～25.0ppm/ ℃.
More specifically, thermal expansivity can obtain best effect between 9.0～12.0ppm/ ℃.Again, in the above-mentioned miniaturization multiplexer for adding and taking light, cement can use heat-curable epoxy resin or ultraviolet cured epoxy resin.
As from the foregoing, miniaturization multiplexer for adding and taking light of the present invention, because the preferable advantage of optical quality of known miniaturization multiplexer for adding and taking light, be controlled in a particular range by thermal expansivity simultaneously with each gasket ring, lower the influence of the variation of environment temperature for the logical centre wavelength drift of band, therefore can obtain temperature effect susceptibility low, and the splendid miniaturization multiplexer for adding and taking light of stability.
For above-mentioned and other purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphic elaborating.
Description of drawings
Fig. 1 is the sectional view of known multiplexer for adding and taking light.
Fig. 2 is the sectional view of known miniaturization multiplexer for adding and taking light.
Fig. 3 is the gasket ring of known miniaturization multiplexer for adding and taking light and filter plate produces thermal stress because of temperature change synoptic diagram.
Fig. 4 is the synoptic diagram of the gasket ring of miniaturization multiplexer for adding and taking light use of the present invention.
Fig. 5 A～5D is the synoptic diagram that the gasket ring of different heat expansion coefficient of the present invention influences the logical centre wavelength of band of filter plate.
Embodiment
See also Fig. 2 and Fig. 4, the miniaturization multiplexer for adding and taking light low to temperature effect susceptibility of one embodiment of the invention is described.The miniaturization multiplexer for adding and taking light of miniaturization multiplexer for adding and taking light 1 of the present invention and known technology is fairly similar structurally, comprise one first glass lasso 10, one first gradually changed refractive index lens 20, a filter plate 40, one second gradually changed refractive index lens 25, one second glass lasso 15 and four gasket rings 30, comprise one first gasket ring 31, one second gasket ring 32, one the 3rd gasket ring 33 and one the 4th gasket ring 34.
The first glass lasso 10 has a hole 11, and a pair of optical fiber 51,52 is set in this hole 11.The second glass lasso 15 has a hole 16, and in this hole 16 optical fiber 53 is set.Then, by a cement, heat-curable epoxy resin 9 for example shown in Figure 2, or ultraviolet cured epoxy resin are adhered to first gasket ring 31 end face 21 of the first gradually changed refractive index lens 20.Further, by heat-curable epoxy resin 9 the first glass lasso 10 is adhered on first gasket ring 31.Then, by heat-curable epoxy resin 9 second gasket ring 32 is adhered on the other end 22 of the first gradually changed refractive index lens 20.Further, by heat-curable epoxy resin 9 filter plate 40 is adhered on second gasket ring 32.Therefore, has both gap 70 of set a distance between the first glass lasso 10 and the first gradually changed refractive index lens 20.
Then, by heat-curable epoxy resin 9 the 3rd gasket ring 33 is adhered to an end face 26 of the second gradually changed refractive index lens 25.Further, by heat-curable epoxy resin 9 the second glass lasso 15 is adhered on the 3rd gasket ring 33.Then, by heat-curable epoxy resin 9 the 4th gasket ring 34 is adhered on the other end 27 of the second gradually changed refractive index lens 25.Further, by heat-curable epoxy resin 9 filter plate 40 is adhered on the 4th gasket ring 34.Therefore, has another both gap 71 of set a distance between the second glass lasso 15 and the second gradually changed refractive index lens 25.
Miniaturization multiplexer for adding and taking light of the present invention is characterized in that the design of gasket ring.As shown in Figure 4, the gasket ring 30 of present embodiment has an outer diameter D, an inner diameter d ' and thickness t, be a hollow gasket ring of ring-type, but its shape also can be arranged to the shape of other hollow, is not subjected to the restriction of present embodiment.This gasket ring 30 has the thermal expansivity of a particular range, below promptly the thermal expansivity scope of gasket ring 30 is illustrated.
Fig. 5 A～Fig. 5 D shows when miniaturization multiplexer for adding and taking light of the present invention uses the gasket ring of different heat expansion coefficient, influences the experimental result of the logical centre wavelength of band of filter plate.The framework of this experiment is that the logical centre wavelength (λ) of the band of filter plate is distinguished into A, B, C, D district to temperature (T), and shows its result with Fig. 5 A, Fig. 5 B, Fig. 5 C and Fig. 5 D respectively.
Fig. 5 A shows when the thermal expansivity when hollow gasket ring 30 is big, for example the experimental result above 25.0ppm/ ℃ slightly.By finding out among Fig. 5 A, when temperature rose, the logical centre wavelength of band will be rapidly toward short wavelength's drift.Fig. 5 B then is the experimental result when showing scope between 9.0～12.0ppm/ ℃ of thermal expansivity when hollow gasket ring 30.By finding out among Fig. 5 B, in range of temperature, the logical centre wavelength of minimum band is arranged during room temperature, when temperature rising and temperature reduced in usable range, the logical centre wavelength of band then rose slightly, but variable quantity is below 0.0003nm/ ℃.
Again, for being compared, Fig. 5 C be with filter plate without hollow gasket ring serial connection, and directly with cement, for example heat-curable epoxy resin or ultraviolet cured epoxy resin, the experimental result when filter plate is engaged with the gradually changed refractive index lens.At this moment, when temperature rose, the logical centre wavelength of band will be toward long wavelength's drift, and the drift amount is about 0.003 to 0.01nm/ ℃.Fig. 5 D is too little for the thermal expansivity when the hollow pad, the experimental result when being less than about 3.0ppm/ ℃.When temperature rises, the logical centre wavelength of band will be rapid in long wavelength's drift, and the drift amount is quite big.
This mandatory declaration be, miniaturization multiplexer for adding and taking light of the present invention since employed filter plate material different, resulting experimental result is also different.Yet, by experimental result as can be known,, therefore when the thermal expansivity of hollow gasket ring is 9.0～12.0ppm/ ℃ scope, can obtain the temperature effect of the best because the thermal expansivity of filter plate is all within limits.Again, when the thermal expansivity of hollow gasket ring is 3.0～25.0ppm/ ℃ a scope, different performances is arranged, still can obtain an acceptable temperature effect according to different filter plate materials.
By miniaturization multiplexer for adding and taking light of the present invention, owing to have cements such as heat-curable epoxy resin or ultraviolet cured epoxy resin in the characteristic that can not infiltrate the gap between gradually changed refractive index lens and the filter plate after the heating, therefore optical quality is preferable, and can reduce cost and make the volume miniaturization.Simultaneously, by the thermal expansivity of each gasket ring of control of feature of the present invention when the certain limit, the variation that can make environment temperature is lowered for the influence of the logical centre wavelength drift of band, therefore can obtain temperature effect susceptibility low, and the splendid miniaturization multiplexer for adding and taking light of stability.
Though the present invention with concrete preferred embodiment openly as above; right its is not in order to limiting the present invention, any those who familiarize themselves with the technology, without departing from the spirit and scope of the present invention; still can do some and change and modification, so protection scope of the present invention is when being as the criterion with claims.
Claims (4)
1, a kind of miniaturization multiplexer for adding and taking light is characterized in that comprising:
One first glass lasso has one first hole and is arranged at the interior a pair of optical fiber of this first hole;
One first gradually changed refractive index lens have one first end face and one second end face, and this first end face engages with this first glass lasso, wherein form both gap of set a distance between this first glass lasso and this first gradually changed refractive index lens;
One second glass lasso has one second hole and is arranged at the interior optical fiber of this second hole;
One second gradually changed refractive index lens have one the 3rd end face and one the 4th end face, and the 3rd end face engages with this second glass lasso, wherein form another both gap of set a distance between this second glass lasso and this second gradually changed refractive index lens;
One filter plate is arranged between these first gradually changed refractive index lens and this second gradually changed refractive index lens, respectively with this second end face and the 4th end joined;
One first gasket ring is arranged between these first gradually changed refractive index lens and this filter plate, and this first gasket ring is adhered to this second end face of this filter plate and these first gradually changed refractive index lens by a cement;
One second gasket ring is arranged between these second gradually changed refractive index lens and this filter plate, and this second gasket ring is adhered to the 4th end face of this filter plate and these second gradually changed refractive index lens by this cement;
One the 3rd gasket ring is arranged between these first gradually changed refractive index lens and this first glass lasso, and the 3rd gasket ring is adhered to this first end face of this first glass lasso and these first gradually changed refractive index lens by this cement; And
One the 4th gasket ring is arranged between these second gradually changed refractive index lens and this second glass lasso, and the 4th gasket ring is adhered to the 3rd end face of this second glass lasso and these second gradually changed refractive index lens by this cement;
Wherein, the thermal expansivity of this first, second, third and the 4th gasket ring is between 3.0～25.0ppm/ ℃.
2, miniaturization multiplexer for adding and taking light as claimed in claim 1, the thermal expansivity that it is characterized in that this first, second, third and the 4th gasket ring is between 9.0～12.0ppm/ ℃.
3, miniaturization multiplexer for adding and taking light as claimed in claim 1 is characterized in that this cement is a heat-curable epoxy resin.
4, miniaturization multiplexer for adding and taking light as claimed in claim 1 is characterized in that this cement is the ultraviolet cured epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121751 CN1207590C (en) | 2002-05-29 | 2002-05-29 | Miniaturized multiplexer with low sensitivity of temperature effect for adding and taking light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121751 CN1207590C (en) | 2002-05-29 | 2002-05-29 | Miniaturized multiplexer with low sensitivity of temperature effect for adding and taking light |
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| Publication Number | Publication Date |
|---|---|
| CN1462889A CN1462889A (en) | 2003-12-24 |
| CN1207590C true CN1207590C (en) | 2005-06-22 |
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| CN 02121751 Expired - Fee Related CN1207590C (en) | 2002-05-29 | 2002-05-29 | Miniaturized multiplexer with low sensitivity of temperature effect for adding and taking light |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112558262B (en) * | 2020-12-07 | 2023-03-17 | 河北汉光重工有限责任公司 | Optical window for eliminating additional internal stress |
| US11320597B1 (en) * | 2021-01-29 | 2022-05-03 | Browave Corporation | Optical device |
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