CN206096548U - Improvement of filter element type dense wavelength division multiplexing optical module - Google Patents
Improvement of filter element type dense wavelength division multiplexing optical module Download PDFInfo
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- CN206096548U CN206096548U CN201620440248.4U CN201620440248U CN206096548U CN 206096548 U CN206096548 U CN 206096548U CN 201620440248 U CN201620440248 U CN 201620440248U CN 206096548 U CN206096548 U CN 206096548U
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Abstract
The utility model discloses an is refracting index lens C by diplopore optic fibre fixing base, decided to filter element type dense wavelength division multiplexing optical module after the improvement lens, R cap, light filter, haplopore optic fibre fixing base are formed, their in proper order the light path connect, whole light path lead to that the light rate is best, the loss hour, fix with gluey to seal in glass bushing. Does wherein, the modified key component lie in that the size of diplopore optic fibre fixing base is fixed, through chooseing the radial R who decides refracting index lens and size matching of different curvatures for use cap realizes the uniformity between center wavelength and ITU wavelength. And it is different to decide the curvature radius of refracting index lens, corresponding R the cap size is different, and the thickness of air bed is different between lens and the filter plate promptly. Do you simultaneously, select to decide refracting index lens C lens replace in traditional dense wavelength division multiplexing optical module from focus lens G lens, it is excellent honest and clean that it has the price, advantages such as the low insertion loss the during long distance. The utility model discloses make filter element type DWDM light modular structure simpler, be convenient for realize, and manufacturing cost reduce by 15% 20%.
Description
Technical field
This utility model is related to technical field of photo communication, and in particular to the filter disc type dense wave division multipurpose light after a kind of improvement
Module.
Background technology
Dense wave division multipurpose optical module（DWDM）A kind of optical fiber data transferring technology is referred to, can be in same optical fiber
The input signal of transmission different wave length, Jing after DWDM elements, after different wavelength is combined and is transmitted, by same root light simultaneously
Fine transmission.Which is widely used, and can be used to lift the network system transmission capacity such as fiber optic communication and CATV, coordinates fiber amplifier to hold
Row multi channel signals amplify, or are used for optical communication device, such as isolator, WDM etc..One key advantage of DWDM is its agreement
It is incoherent with transmission speed.Network based on DWDM can using IP agreement, ATM, SONET/SDH, Ethernet protocol come
Transmission data, the data traffic of process is between 100Mb/s and 2.5Gb/s.So, the network based on DWDM can be swashed at one
Transmit different types of data traffic on optical channel at different rates, the communication for not only drastically increasing network system is held
Amount, takes full advantage of bandwidth of an optical fiber, and it has dilatation simple and many advantages, such as dependable performance, and being particularly it can be straight
Accessing multiple business more causes its application prospect very bright.
At present, the operation principle of widely used filter disc type DWDM is essentially consisted in by changing fiber fixed seat diplopore
The distance between change incident angle of light, its incident illumination and reflected light angle are between 1.8-2.5 °, and then make centre wavelength
It is guaranteed with ITU consistent wavelengths.But this double-pore structure complex manufacturing technology, needs sizes to meet actual need
Ask, increased the degree of difficulty of production.This structure precision requirement is higher, every 3 between holesμmNeed to make a chi
Very little diplopore fiber fixed seat, in actual production, the interval between diplopore is difficult to hold, and it is inaccurate that precision often occurs in Jing, good
Product rate is not high, structural instability, the shortcomings of in high/low temperature, cold and hot cycle experimental, finished product is frangible.
Filter disc type DWDM is mainly made up of narrow bandwidth, high stable bandpass filter, lens, thang-kng matrix etc., its
In selected lens be GRIN Lens（GRIN Lens）.The distribution of GRIN Lens Refractive Index of Material radially gradually subtracts
It is little, make the light for transmitting vertically produce continuous refraction, so as to realize that emergent ray is smooth and continuously converges to a bit.It is one
More conventional optical component is planted, such as in the Chinese patent of disclosed Patent No. CN1421717A, that is, be make use of
This lens of GRIN Lens, but it has some shortcomings in making and using on：Such as eyeglass makes difficult, high cost, no
The simple molding of energy, and operating distance is limited, development trend inexpensive with nowadays optical device, high performance is not corresponded.This practicality is new
Type is improved for the above shortcoming.
The content of the invention
This utility model is improved for prior art, it is proposed that a kind of process is simple, and cost-effective filter disc type is close
Collection wavelength-division multiplex optical module.
This utility model includes following technical scheme：
A kind of filter disc type dense wave division multipurpose optical module after improvement, including diplopore fiber fixed seat（1）, determine refractive index saturating
Mirror C-Lens（2）, R-Cap（3）, optical filter（4）, the spacing of optical filter and lens（5）, single hole fiber fixed seat（6）, glass sock
Pipe（7）.
After improvement, the assembling process of filter disc type dense wave division multipurpose optical module is as follows：
Work order is fed intake；Material carries out cleaning, cleans, toasts；Test optical filter（4）；To determine index lens（2）Put
It is placed in R-Cap（3）In；Paste R-Cap（3）With optical filter（4）；Carry out double fine regulations（1）；Envelope waist drum and mushroom head, carry out UV
Solidification, baking；Test reflection end；Carry out full glue encapsulation；Glaze sleeve pipe（7）；Baking, UV are fully cured；Carry out high/low temperature to follow
Ring (TC)；Optical fiber cable indicates Mark；Carry out visual examination, QC inspections；Paste external package pipe label；Final test；Outward appearance inspection again
Look into；Packed；Second QC inspection；Final finished is put in storage.
Principle of the present utility model is：
Comprising λ 1, the fibre core that the incident illumination of λ 2, λ 3, λ 4 this four wavelength is entered in glass tubing, Jing C-Lens lens（2）Enter
Row beam collimation；Collimated light passes through optical filter（4）；The light beam of 4 these three wavelength of λ 2, λ 3, λ is reflected, and is fixed along diplopore optical fiber
Seat（1）Another fibre core in glass tubing is back to incidence end；And pass through optical filter（4）Specific wavelength of light λ 1 is obtained.Diplopore
Fiber fixed seat（1）Size is fixed, and incident illumination respectively enters two different fibre cores in glass tubing from reflected light, it is ensured that incident illumination
Angle with reflected light is 1.8 °, by determining index lens from different curvature radius（2）And the R-Cap of size matching
（3）, realize the concordance between centre wavelength and ITU wavelength.Using C-Lens（2）By the light of outgoing in optical fiber collimated change
Into the minimum light beam of the angle of divergence, the coupling efficiency of optical device is improved with this.Using optical filter（4）Leach the light λ of specific wavelength
1, it is finally reached filter disc type dense wave division multipurpose optical module and penetrates specific wavelength of light λ 1, reflects other light wavelength lambdas 2, λ 3, the mesh of λ 4
's.Wherein C-Lens（2）Radius of curvature it is different, corresponding R-Cap（3）Size is different, i.e., air between lens and filter plate
Layer（5）Thickness it is different.The C-Lens of each different curvature radius（2）There is a corresponding R-Cap（3）, i.e., the two
Size matches, while ensureing R-Cap（3）Can be with optical filter（4）It is brought into close contact.
After fibre core of the incident illumination in glass tubing propagates to C-Lens lens, be considered as by radius of curvature be firstρ o
Surface of spherical medium（ρ o =∞）, then in the distance of the Propagation L that refractive index is n, being finally then passed through radius of curvature isρ's
Surface of spherical medium.The transformation matrix of lens combination is equal to the product of the inverted sequence of above three transformation matrix：
（1）
C-Lens refractive indexs are fixed, light from fiber exit to lens left side, with emergent light as waist of Gaussian beam, this time
Speckle radius is：
················（2）
The relevant parameter of lens can be obtained by transmission matrix：
Object space intercept：·············· (3)
Image space focal length：··················· (4)
Image space intercept： ··················(5)
After C-Lens, during transmission range L, total transmission matrix is light beam：
··················（6）
By can be calculated the hot spot situation from after lens outgoing.
The waist radius of C-Lens is changed into ω2, its expression formula is：
···········(7)
The principal point of lens, focal position can be obtained by the R values of lens, L-value and refractive index, and obtain itself and beam waist
With the relation of operating distance.
Beneficial effect：
In sum, compared with traditional structure, this utility model has advantages below:
1）The fiber fixed seat size of double-pore structure is single, and diplopore is apart from self-locking, it is not necessary to adjust；Change different curvature
The index lens of determining of radius facilitate and stable.
2）Process is simple, can meet actual demand by simple adjustment, reduce the degree of difficulty of production, throw beneficial to production
Enter practical application.
3）The selected index lens of institute（C-Lens）Price compared with GRIN Lens（GRIN Lens）Cheaply, device cost
Reduce.
4）Long range work can be carried out, operating distance scope is wide low insertion loss.Receiving sensitivity is high, and loss is little,
Transmission range is long.
5）The design of system structure design and various sizes of diplopore fiber fixed seat eliminates the reliance on producer and microtechnic,
Overall applicability cost can reduce 15%-20%.
Description of the drawings
The structural representation of Fig. 1 tradition filter disc type dense wave division multipurpose optical modules；
Fig. 2 the utility model proposes filter disc type dense wave division multipurpose optical module structural representation；
The structural representation of Fig. 3 diplopore fiber fixed seats；
The left view of Fig. 4 diplopore fiber fixed seats；
Fig. 5 determines the structural representation of index lens C-Lens.
Labelling in figure：
（1）Diplopore fiber fixed seat,（2）Determine index lens C-Lens,（3）R-Cap,（4）Optical filter,（5）Optical filter
With the spacing of lens,（6）Single hole fiber fixed seat is constituted,（7）Glass bushing,（8）Various sizes of diplopore fiber fixed seat,
（9）GRIN Lens GRIN Lens,（10）Incident optical channel,（11）Reflection optical channel,（12）8 ° of angles inclined-plane.
Specific embodiment
With reference to embodiment and accompanying drawing, the utility model is described in further detail, but not limited to this.
Embodiment 1
As shown in figure 1, a kind of structural representation of traditional filter disc type dense wave division multipurpose optical module.The structure includes：
Diplopore fiber fixed seat（8）, GRIN Lens GRIN Lens（9）, optical filter（4）, single hole fiber fixed seat（6）, they are successively
Light path connects, and is enclosed in glass bushing（7）In.The operation principle of the structure is, by selecting various sizes of diplopore optical fiber
Fixed seat（8）, i.e. the distance between diplopore difference changes incident angle of light, and then ensures the one of centre wavelength and ITU wavelength
Cause property, wherein incident illumination angle are typically between 1.8-2.5 °.The machining accuracy of the double-pore structure is very high, the distance between diplopore
Every 3μmNeed make a size, yield rate in technique it is difficult to ensure that.Lens select GRIN Lens GRIN Lens,
Its refractive index radially changes, gradually changed refractive index distribution, and optical axis refractive index highest, marginal refractive rate are minimum.But its price it is high and
Operating distance is limited.
Embodiment 2
As shown in Fig. 2 the structural representation of the filter disc type dense wave division multipurpose optical module after improving.This structure is on the one hand complete
Requirement of the full up sufficient dense wave division multipurpose optical module in optical communication network application, on the other hand reduces the technology of technique making
Difficulty, is more reduction of cost.This structure includes：Diplopore fiber fixed seat（1）, determine index lens C-Lens（2）, R-Cap
（3）, optical filter（4）, single hole fiber fixed seat composition（6）, their light path connections successively, whole light path thang-kng rate preferably,
During loss reduction, it is fixed with glue, and is enclosed in glass bushing（7）In.Comprising λ 1, the incidence of λ 2, λ 3, λ 4 this four wavelength
The fibre core that light is entered in glass tubing, Jing C-Lens lens（2）Carry out beam collimation；Collimated light passes through optical filter（4）；λ 2, λ 3, λ 4
The light beam of these three wavelength is reflected, along diplopore fiber fixed seat（1）Another fibre core in glass tubing is back to incidence end；And
By optical filter（4）Specific wavelength of light λ 1 is obtained.
Wherein, diplopore fiber fixed seat（1）Size is fixed, and incident illumination and reflected light respectively enter two in glass tubing not
Same fibre core, it is ensured that the angle of incident illumination and reflected light is 1.8 °, by determining index lens from different curvature radius（2）And
The R-Cap of size matching（3）, realize the concordance between centre wavelength and ITU wavelength.C-Lens（2）Collimating effect can be by
In optical fiber, the light of outgoing is collimated becomes the minimum light beam of the angle of divergence, is reduced loss, is improved the coupling efficiency of optical device with this.
By C-Lens（2）With R-Cap（3）After fixation, R-Cap is made（3）Can be with optical filter（4）It is brought into close contact.Optical filter（4）Effect
It is the PASSIVE OPTICAL device that can be leached the light of certain specific wavelength and load the light of certain specific wavelength, in this structure, selects narrow bandwidth
, the bandpass filter of high stable.Specific wavelength λ 1 is obtained finally.In this configuration, it is no longer necessary to use different size
Diplopore fiber fixed seat, single size can meet require；While reducing whole mould from index lens C-Lens is determined
The cost of block.
Embodiment 3
As shown in Figure 3, Figure 4, be improve after in filter disc type dense wave division multipurpose optical module diplopore fiber fixed seat structure
Schematic diagram and left view.In figure 3, clearly illustrate diplopore fiber fixed seat（1）Internal structure, wherein (10) are incidence
Passage of the light inside fiber fixed seat, the passage that (11) are reflected light inside fiber fixed seat,（12）For 8 ° of angles inclined-plane, it
Act the effect for reducing volume reflection, reducing reflection light.What whole diplopore fiber fixed seat was main act as fixing optical fiber.For changing
Filter disc type dense wave division multipurpose optical module after entering, different from traditional structure is the selection of diplopore fiber fixed seat.Such as Fig. 1
In diplopore fiber fixed seat（8）, incident optical channel with reflection optical channel different size must be selected by physical condition.And Fig. 2
In diplopore fiber fixed seat（1）, the spacing between incident optical channel (10) and reflection optical channel (11) is fixed, such as Fig. 4 institutes
Show.The direct distance of holes need not be changed again, and the structure after improvement adjusts incident illumination no longer by changing diplopore size
Angle.This causes process is simple, can meet actual demand by simple adjustment, reduce the degree of difficulty of production, beneficial to production
Input practical application.
The production procedure of diplopore fiber fixed seat is as follows：Cleaning capillary tube；Fixed seat is assembled；Grinding fixed seat；Before plated film
Cleaning；Visual inspection before plated film；Plated film；Clean after plated film；Test after plated film；Fixed seat visual inspection；Finally packed.
Embodiment 4
In above-described embodiment 2, the lens applied are to determine index lens C-Lens.C-Lens is China's independent research
Novel micro optical element, its structure is as shown in Figure 5.Center Lengths of the L for C-Lens, diameters of the Φ for C-Lens,ρFor ball
The radius of curvature in face,θFor the inclination angle of angled end-face.The refractive index of C-Lens is constant, and it belongs to thick lenses, and an end face is
Sphere, another end face are inclined-plane, and 8 ° of inclination angle of inclined plane selection, its return loss value can be more than 60dB, comply fully with fiber optic communication
Requirement.Compared with traditional GRIN Lens GRIN-Lens, the low price of C-Lens, largely reduce device into
This.Long range work can be carried out simultaneously, operating distance scope is wide low insertion loss.Receiving sensitivity is high, and little, transmission is lost
Distance.
Above content is with reference to specific preferred implementation further detailed description of the utility model, it is impossible to
Identification is of the present utility model to be embodied as being confined to these explanations.For the person of ordinary skill of the art, can be with root
According to the technical solution of the utility model and inventive concept, make corresponding change and substitute, and performance or purposes are identical, all should
It is considered as protection domain of the present utility model.
Claims (4)
1. a kind of filter disc type dense wave division multipurpose optical module, by diplopore fiber fixed seat（1）, determine index lens C-Lens（2）,
R-Cap（3）, optical filter（4）, single hole fiber fixed seat composition（6）, their light path connections successively, and it is enclosed in glass bushing（7）
In.
2. filter disc type dense wave division multipurpose optical module according to claim 1, it is characterised in that diplopore fiber fixed seat
（1）Size is fixed, and incident illumination respectively enters two different fibre cores in glass tubing from reflected light, it is ensured that incident illumination and reflected light
Angle is 1.8 °, by determining index lens from different curvature radius（2）And the R-Cap of size matching（3）, in realizing
Concordance between cardiac wave length and ITU wavelength；Wherein determine index lens（2）Radius of curvature it is different, corresponding R-Cap（3）Chi
Air layer between very little difference, i.e. lens and filter plate（5）Thickness it is different.
3. filter disc type dense wave division multipurpose optical module according to claim 1, it is characterised in that C-Lens lens（2）Can
Beam collimation is carried out to the incident illumination of four different wave lengths；Collimated light passes through optical filter（4）；The wherein light beam of three wavelength
Reflected, along diplopore fiber fixed seat（1）Another fibre core in glass tubing is back to incidence end；And pass through optical filter（4）Can
Obtain the light beam of a certain specific wavelength.
4. filter disc type dense wave division multipurpose optical module according to claim 1, it is characterised in that each different curvature radius
Determine index lens（2）There is a corresponding R-Cap（3）, i.e. the two size matches, while R-Cap（3）Can be with
With optical filter（4）It is brought into close contact.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466995A (en) * | 2021-07-16 | 2021-10-01 | 厦门贝莱信息科技有限公司 | Manufacturing process of online isolator with filtering function |
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2016
- 2016-05-16 CN CN201620440248.4U patent/CN206096548U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466995A (en) * | 2021-07-16 | 2021-10-01 | 厦门贝莱信息科技有限公司 | Manufacturing process of online isolator with filtering function |
| CN113466995B (en) * | 2021-07-16 | 2024-02-23 | 厦门贝莱信息科技有限公司 | On-line isolator manufacturing process with filtering function |
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