CN105467521A - An adjustable optical attenuation type wavelength division multiplexer and an attenuation degree adjusting method - Google Patents
An adjustable optical attenuation type wavelength division multiplexer and an attenuation degree adjusting method Download PDFInfo
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- CN105467521A CN105467521A CN201510915574.6A CN201510915574A CN105467521A CN 105467521 A CN105467521 A CN 105467521A CN 201510915574 A CN201510915574 A CN 201510915574A CN 105467521 A CN105467521 A CN 105467521A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/29391—Power equalisation of different channels, e.g. power flattening
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention discloses an adjustable optical attenuation type wavelength division multiplexer and an attenuation degree adjusting method. The adjustable optical attenuation type wavelength division multiplexer comprises a cylindrical support body provided with a plurality of grooves. A reflection support body is connected to the support body through a connecting rod. An optical attenuation disc is connected between the support body and the reflection support body through a connecting rod in a passing-through mode. Attenuation sheets with different attenuation degrees are placed in an embedded mode along a circumference. Incident collimators and output collimators are bonded in the grooves of the support body. A reflection optical filter is placed at a port portion of the output collimator. A total reflection prism is bonded on an end surface of the reflection support body. The invention also discloses an attenuation degree adjusting method of the adjustable optical attenuation type wavelength division multiplexer. Through rotatably adjusting of the optical attenuation discs, the attenuation sheets with the different attenuation degrees are made to be aligned with an output port to realize attenuation degree adjusting of the optical power of the output port.
Description
Technical field
The present invention relates to light wavelength division multiplexing field, particularly a kind of optical attenuation type wavelength division multiplexer and dough softening control method thereof.
Background technology
The optical signal transmission speed goes of modern optical fiber telecommunications system is fast, and the capacity of system is also increasing, and this depends on the application of Erbium-Doped Fiber Amplifier (EDFA) (EDFA) and dense wave division multipurpose (DWDM) technology.But, the signal light power unevenness of launching due to optical signal transmitter and the gain spectral unevenness of Erbium-Doped Fiber Amplifier (EDFA), make the light signal of the some different wave lengths in dense wavelength division multiplexing system after Erbium-Doped Fiber Amplifier (EDFA), corresponding gain is inconsistent, and along with the multiple Erbium-Doped Fiber Amplifier (EDFA) cascades uses in long haul communications systems, this gain unevenness is constantly accumulated, cause the power of different channels extremely uneven, cause the dynamic unbalance of optical fiber telecommunications system.
In addition, in fiber optic communication systems, when number of channel increase and decrease or the change of certain channel power of optical transport, also can cause other channel power saltus step, the signal to noise ratio (S/N ratio) of the optical power value that each channel of receiver receives and light signal is also just different.This lack of uniformity is very harmful to the transmission performance of whole optical fiber telecommunications system, often between the signal of Shi Ge road, crosstalk occurs, and makes the bit error rate of some wavelength channel higher than designated value.If unbalanced performance number is too high, light signal transmission generation nonlinear effect in a fiber can be caused, and the optical power value causing receiver to receive exceedes the maximum dynamic range of receiver.If unbalanced performance number is too low, the optical power value that receiver can be caused to receive lower than the sensitivity of receiver, then causes receiver not receive light signal.
Therefore, people's use carries out optical power adjustment to all channel adjustable optical attenuator that the signal light power of each channel carries out dynamic adjustments to the signal of multiple channel, especially Compact type wavelength division multiplexer, it is because structure is simple, size is little, cheap, is widely used in optical communications industry at present, but because channel power exists obvious lack of uniformity, being therefore badly in need of a kind of method can the power of each channel of balanced Compact type wavelength division multiplexer.
Summary of the invention
One object of the present invention an object of the present invention is to solve at least the problems referred to above and defect, and provides the advantage will illustrated at least below.
An object of the present invention is the channel power carrying out balanced compact wavelength division multiplexer by adding decay dish.
A further object of the invention is the accurate control being realized channel light power by the dough softening of change attenuator.
In order to realize according to these objects of the present invention and other advantage, the present invention has designed and developed a kind of variable optical attenuation type wavelength division multiplexer, comprising:
Supporter, it is cylindrical, and cylinder is provided with multiple groove;
Reflective support body, it is cylindrical, is connected with supporter by connecting link;
Optical attenuation dish, it is disc-shaped structure, by connecting link, cross-under in the middle of supporter and reflective support body, the attenuator circumferentially embedded placement of differential declines degree;
Incident collimating apparatus, it is bonded in described supporter groove, is light input port;
Output collimator, its quantity is multiple, is bonded in described supporter groove, is light output end mouth;
Reflection filter, it is identical with output collimator quantity, is placed on output collimator port, and the light of specific wavelength can be allowed to pass through, the light reflection of other wavelength;
Total reflection prism, it is bonded on reflective support body end face, by the light reflection of incidence to next output port;
Preferably, described connecting link through reflective support body, and is provided with motor, and optical attenuation dish can be driven to rotate.
Preferably, described optical attenuation dish quantity is one or more.
Preferably, in described optical attenuation dish, the dough softening of attenuator is 0dB ~ 30dB.
Preferably, described incident collimating apparatus and output collimator are miniature fiber collimating apparatus, and external diameter is 1mm ~ 1.5mm, and the incident angle of incident collimating apparatus is 5 ° ~ 15 °.
Preferably, described groove, the degree of depth is 0.3mm ~ 0.6mm, and width is 1.2mm ~ 1.7mm.
Preferably, described reflection filter is column disk, and diameter is 1.2mm ~ 1.7mm.
Preferably, described reflection filter reflected wavelength range is 1260nm ~ 1620nm.
Preferably, described reflection filter transmission peak wavelength is Coarse Wave Division Multiplexer common wavelengths, the one in 1310nm, 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm, 1610nm.
Object of the present invention can also further by a kind of dough softening control method of wavelength division multiplexer, and realize, the method comprises the following steps:
Step one: first will include three wavelength information λ
1, λ
2, λ
3broadband light incide incident collimating apparatus, the GRIN Lens in incident collimating apparatus, by the transmission λ in optical fiber
1, λ
2, λ
3broadband light be transformed into collimated light, then through optical attenuation dish, rotate optical attenuation dish, collimated light is γ through embedding the dough softening of optical attenuation dish
1attenuator, try to achieve decay after luminous power be,
Wherein P
infor luminous power during broadband light incidence;
Step 2: after decay, light is to total reflection prism, after reflection, light is γ through the dough softening of optical attenuation dish
2attenuator decay, then filter through reflection filter, wavelength is λ
1narrow band light received by output collimator and export, now Output optical power is,
Thus, the Output optical power of channel n is,
Preferred as one, γ
1, γ
2γ
nvalue can be identical or different.
Beneficial effect
The present invention carrys out the channel power of balanced compact wavelength division multiplexer by adding decay dish, and between each channel of active balance, the balance of luminous power, reduces the probability that inter-channel crosstalk and saltus step occur; The accurate control of channel light power is realized by the dough softening changing attenuator; Adopt column structure, encapsulating structure can adopt the cylindrical shell of one end open, has the raising being easy to sealing property, extends the serviceable life of wavelength division multiplexer.
Accompanying drawing explanation
Fig. 1 is the structural representation of variable optical attenuation type wavelength division multiplexer of the present invention.
Fig. 2 is the index path of variable optical attenuation type wavelength division multiplexer of the present invention.
Fig. 3 is the structural representation of optical attenuation dish of the present invention.
Fig. 4 is the structural representation of collimating apparatus of the present invention.
Fig. 5 is that reflection filter of the present invention and collimating apparatus tail optical fiber bond schematic diagram.
Fig. 6 is another embodiment index path of variable optical attenuation type wavelength division multiplexer of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to instructions word to make those skilled in the art.
As shown in Figure 1, variable optical attenuation type wavelength division multiplexer provided by the invention comprises: supporter 110, connecting link 120, reflective support body 130, optical attenuation dish 140, incident collimating apparatus 150, output collimator 160, reflection filter 170 and total reflection prism 180.
Wherein supporter 110, it is cylindrical, cylinder is provided with multiple groove, for incident collimating apparatus 140 and the output collimator 150 of boning, it is 0.3mm ~ 0.6mm that groove is of a size of the degree of depth, width is 1.2mm ~ 1.7mm, material is the smaller metal of expansion coefficient, prevent difference variation from producing distortion, affect device service precision, the diameter of supporter 110 determines according to the quantity of output collimator 150, and namely output port wavelength decides, export that channel is more increases supporter diameter, export channel less reduction supporter diameter;
Connecting link 120, it is Metallic rod, produces deformation after preventing the temperature difference or oxidation, affect the use of wavelength division multiplexer, side connects supporter 110, and side connects reflective support body 130, by optical attenuation dish 140 cross-under in the middle of supporter 110 and reflective support body 130, mainly play support fixation.
As shown in Figure 3, optical attenuation dish 140, it is disc-shaped structure, it is disc-shaped structure, and by connecting link 120, cross-under is in the middle of supporter 110 with reflective support body 130, the attenuator circumferentially embedded placement of differential declines degree, the dough softening of attenuator is 0dB ~ 30dB;
In another embodiment, the quantity of optical attenuation dish 140 is two or more, incident ray is once decayed through the attenuator of first optical attenuation dish, namely luminous power diminishes, once decay through second optical attenuation dish, the dough softening superposes again, and the attenuator dough softening as the first optical attenuation dish 141 is 5dB, the attenuator dough softening of the second optical attenuation dish 142 is 15dB, and light is optical power attenuation 20dB after two are rotated two optical attenuation dishes once.
Reflective support body 130, it is cylindrical, and material is plating protective paint metal, connected with supporter 110 by connecting link 120, reflective support surface its be bonded with multiple total reflection prism 180, the effect of total reflection prism 180 is equivalent to level crossing, but has reflecting properties more better than level crossing, energy loss is little, efficiency is better, and stability is high, the light reflection of incidence can be gone out, loss-free next output port being transferred to wavelength division multiplexer;
Incident collimating apparatus 150, it is single optical fiber calibrator, is accurately located form by tail optical fiber and GRIN Lens, and adopt glass capillary to encapsulate, good airproof performance, deformation is little, transmission light in optical fiber can be transformed into collimated light (directional light) by it, or parallel for the external world (less parallel) is optically coupled in single-mode fiber, be bonded in described supporter groove, for light input port, incident collimating apparatus incident angle is 5 ° ~ 15 °, with low-angle incidence whole wavelength division multiplexer structure can be done smaller and more exquisite, be beneficial to the miniaturization integrated development of optical communication equipment, the external diameter of optical fiber collimator is 1mm ~ 1.5mm, it is miniature fiber collimating apparatus, for the existing mini-collimator commonly used, structural manufacturing process is ripe, and size is less, reduce difficulty of processing, stability is high,
Output collimator 160, it is single optical fiber calibrator, accurately located by tail optical fiber and GRIN Lens and form, glass capillary is adopted to encapsulate, good airproof performance, deformation is little, transmission light in optical fiber can be transformed into collimated light (directional light) by it, or parallel for the external world (less parallel) is optically coupled in single-mode fiber, its quantity is multiple, be bonded in described supporter groove, for light output end mouth, the external diameter of fine collimating apparatus is 1mm ~ 1.5mm, it is miniature fiber collimating apparatus, for the existing mini-collimator commonly used, structural manufacturing process is ripe, and size is less, reduce difficulty of processing, stability is high,
Reflection filter 170, it is identical with output collimator quantity, be placed on output collimator port, the light of specific wavelength can be allowed to pass through, the light reflection of other wavelength, in coarse wavelength division multiplexing systems, the use of multi-cavity arrowband wave plate is very extensive, technology maturation, can be used for the light signal of transmission specific wavelength and bandwidth.Mostly common wave plate is for normal incidence occasion, and along with the increasing of light signal incident angle, the peak wavelength of its transmission curve and passband all can move to shortwave direction, and its transmission peaks decays rapidly, and transmission curve is out of shape, and occurs multiple transmission peak value.Wave plate used in the present invention is by adding the high low-index material of the different number of plies and thickness, have adjusted the equivalent refractive index of each wall of wave plate, improve the film structure of arrowband wave plate, transmission performance during oblique incidence is stablized, Polarization Dependent Loss and insertion loss lower, make tunable range larger.For multi-cavity arrowband wave plate, its multilayer film can be equivalent to two effective interfaces, along with the increase of incident angle, and more and more faster to short wave mobile of wave plate centre wavelength, this is due to when equivalent refractive index is certain, and the movement of wavelength is proportional to the sine value of incident angle.Ensure that the spacer layer configuration between each chamber is equal by the high low-index material that adds the different number of plies as its wall, just can when not using new material, wave plate is made to have larger deflection angle, the congested problem of good solution collimating apparatus, and do not need to increase any element in addition, passbands specification and loss objective all meet the requirement of wavelength-division multiplex system, both reduced costs, reduce difficulty of processing again, and improve the reliability of product, reflection filter is column disk, diameter is 1.2mm ~ 1.7mm, reflection filter has a minute angle in an assembling process, enhance projection performance, the reflection filter reflected wavelength range that stability is stated is 1260nm ~ 1620nm, transmission peak wavelength is Coarse Wave Division Multiplexer common wavelengths, 1310nm, 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm, one in 1610nm.
As shown in Figure 2, the index path of variable optical attenuation type wavelength division multiplexer, the light that multiple wavelength is combined with each other is through incident collimating apparatus 150, Gaussian beam is become collimated light, again through optical attenuation dish 140, decay, after decay, light is to the first total reflection prism 181, after reflection, light is decayed through optical attenuation dish 140, filter through the first reflection filter 171 again, specific wavelength is received by the first output collimator 161 and is exported, the light of other wavelength reflects through the first reflection filter 171, decay through optical attenuation dish 140 again, incide the second total reflection prism 182, after reflection, light is decayed through optical attenuation dish 140, filter through the second reflection filter 172 again, specific wavelength is received by the second output collimator 162 and is exported.
In another embodiment, connecting link 120, it is Metallic rod, deformation is produced after preventing the temperature difference or oxidation, affect the use of wavelength division multiplexer, side connects supporter 110, side connects reflective support body 130, by optical attenuation dish 140 cross-under in the middle of supporter 110 and reflective support body 130, mainly play support fixation, the head of connecting link is provided with rotary electric machine, wherein reflective support body 130 and supporter 110 maintain static, optical attenuation dish 140 is fixed on connecting link 120, motor can drive connecting link 120 to rotate, optical attenuation dish 140 rotates with connecting link 120, realize the corresponding incident collimating apparatus 150 of attenuator of differential declines degree, the dough softening realizing wavelength division multiplexer regulates.
Implement to be described further for the course of work of three channel variable optical attenuation type wavelength division multiplexers,
First three wavelength information λ will be included
1, λ
2, λ
3broadband light incide incident collimating apparatus 150, the GRIN Lens in incident collimating apparatus 150, by the transmission λ in optical fiber
1, λ
2, λ
3broadband light be transformed into collimated light, then through optical attenuation dish 140, rotating optical attenuation dish 140, making collimated light be γ through embedding the dough softening of optical attenuation dish 140
1attenuator 141, decay, decay after light to the first total reflection prism 181, reflection after light be γ through the dough softening of optical attenuation dish 140
2attenuator 142 decay, then filter through the first reflection filter 171, wavelength is λ
1narrow band light received by the first output collimator 161 and exported;
Other wavelength is λ
2, λ
3broadband light reflect through the first reflection filter 171, then be γ through the dough softening of optical attenuation dish 140
3attenuator 143 decay, then incide the second total reflection prism 182, reflection after light be γ through optical attenuation dish 140 dough softening
4attenuator 144 decay, then to filter through the second reflection filter 172, wavelength X
2received by the second output collimator 162 and exported;
Wavelength is λ
3broadband light reflects through the second reflection filter 172, then is γ through optical attenuation dish 140 dough softening
5attenuator 145 decay, then incide the 3rd total reflection prism 183, reflection after light be γ through optical attenuation dish 140 dough softening
6attenuator 146 decay, then to filter through the 3rd reflection filter 173, wavelength X
3received by the 3rd output collimator 163 and exported.
Optical attenuator and wavelength division multiplexer convolution design, and greatly can reduce the volume of instrument, improve the overall performance of instrument, meet the requirement of fiber optic communication field miniaturization and low cost.
Present invention also offers a kind of dough softening control method of variable optical attenuation type wavelength division multiplexer, comprise the following steps:
Step one: first will include three wavelength information λ
1, λ
2, λ
3broadband light incide incident collimating apparatus 150, the GRIN Lens in incident collimating apparatus 150, by the transmission λ in optical fiber
1, λ
2, λ
3broadband light be transformed into collimated light, then through optical attenuation dish 140, rotate optical attenuation dish 140, collimated light is γ through embedding the dough softening of optical attenuation dish 140
1, attenuator 141, try to achieve decay after luminous power, unit is mw,
Wherein the unit of the dough softening is dB, P
infor luminous power during broadband light incidence, unit is mw;
Step 2: after decay, light is to total reflection prism, after reflection, light is γ through the dough softening of optical attenuation dish 140
2attenuator decay, then filter through reflection filter, wavelength is λ
1narrow band light received by output collimator and export, now Output optical power, unit is mw,
Thus, the Output optical power of channel n, unit is mw,
Preferred as one, γ
1, γ
2γ
n+1value can be identical or different.
In another embodiment, reflection filter can bond and be placed on the tail optical fiber end of output collimator, as shown in Figure 4, for the structural representation of collimating apparatus, it is by GRIN Lens 151, tail optical fiber 152 and package tube 153 form, tail optical fiber 152 is mainly used in fixed fiber, Gauss light is converted to parallel light emergence by GRIN Lens 151, as shown in Figure 5, be the optical fiber entry port place that the thin reflection filter 200 of 0.3mm ~ 0.5mm is bonded in tail optical fiber by thickness, the light of specific wavelength can be allowed to pass through, through GRIN Lens 151 outgoing after the light reflection of other wavelength.
As shown in Figure 6, its working method is as follows,
The light that multiple wavelength is combined with each other is through incident collimating apparatus 150, Gaussian beam is become collimated light, again through optical attenuation dish 140, decay, after decay, light is to the first total reflection prism 181, after reflection, light is decayed through optical attenuation dish 140, enter the first output collimator 161, filter through reflection filter again, specific wavelength is received by the first output collimator 161 and is exported, the light of other wavelength reflects through reflection filter, decay through optical attenuation dish 140 again, incide the second total reflection prism 182, after reflection, light is decayed through optical attenuation dish 140, enter the first output collimator 162, filter through the second reflection filter again, specific wavelength is received by the second output collimator 162 and is exported.
Although embodiment of the present invention are open as above, but it is not restricted to listed in instructions and embodiment utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (10)
1. a variable optical attenuation type wavelength division multiplexer, is characterized in that, comprising:
Supporter, it is cylindrical, and cylinder is provided with multiple groove;
Reflective support body, it is cylindrical, is connected with supporter by connecting link;
Optical attenuation dish, it is disc-shaped structure, by connecting link, cross-under in the middle of supporter and reflective support body, the attenuator circumferentially embedded placement of differential declines degree;
Incident collimating apparatus, it is bonded in described supporter groove, is light input port;
Output collimator, its quantity is multiple, is bonded in described supporter groove, is light output end mouth;
Reflection filter, it is identical with output collimator quantity, is placed on output collimator port, and the light of specific wavelength can be allowed to pass through, the light reflection of other wavelength;
Total reflection prism, it is bonded on reflective support body end face, by the light reflection of incidence to next output port.
2. variable optical attenuation type wavelength division multiplexer according to claim 1, is characterized in that, described connecting link through reflective support body, and is provided with motor, and optical attenuation dish can be driven to rotate.
3. variable optical attenuation type wavelength division multiplexer according to claim 1, is characterized in that, described optical attenuation dish quantity is one or more.
4. the variable optical attenuation type wavelength division multiplexer according to claim 1 or 3, is characterized in that, in described optical attenuation dish, the dough softening of attenuator is 0dB ~ 30dB.
5. variable optical attenuation type wavelength division multiplexer according to claim 1, is characterized in that, described incident collimating apparatus and output collimator are miniature fiber collimating apparatus, and external diameter is 1mm ~ 1.5mm, and the incident angle of incident collimating apparatus is 5 ° ~ 15 °.
6. variable optical attenuation type wavelength division multiplexer according to claim 1, is characterized in that, described groove, and the degree of depth is 0.3mm ~ 0.6mm, and width is 1.2mm ~ 1.7mm.
7. variable optical attenuation type wavelength division multiplexer according to claim 1, is characterized in that, described reflection filter is column disk, and diameter is 1.2mm ~ 1.7mm.
8. the variable optical attenuation type wavelength division multiplexer according to claim 1 or 7, is characterized in that, described reflection filter reflection wavelength is 1210nm ~ 1620nm.
9. variable optical attenuation type wavelength division multiplexer according to claim 8, it is characterized in that, described reflection filter transmission peak wavelength is Coarse Wave Division Multiplexer common wavelengths, the one in 1310nm, 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm, 1610nm.
10. a dough softening control method for variable optical attenuation type wavelength division multiplexer, uses the variable optical attenuation type wavelength division multiplexer as described in any one of claim 1-9, it is characterized in that, comprise the following steps:
Step one: first will include three wavelength information λ
1, λ
2, λ
3broadband light incide incident collimating apparatus, the GRIN Lens in incident collimating apparatus, by the transmission λ in optical fiber
1, λ
2, λ
3broadband light be transformed into collimated light, then through optical attenuation dish, rotate optical attenuation dish, collimated light is γ through embedding the dough softening of optical attenuation dish 140
1attenuator, try to achieve decay after luminous power be,
Wherein P
infor luminous power during broadband light incidence;
Step 2: after decay, light is to total reflection prism, after reflection, light is γ through the dough softening of optical attenuation dish 140
2attenuator decay, then filter through reflection filter, wavelength is λ
1narrow band light received by output collimator and export, now Output optical power is,
Thus, the Output optical power of channel n is,
Preferred as one, γ
1, γ
2γ
nvalue can be identical or different.
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| CN109613656A (en) * | 2018-12-20 | 2019-04-12 | 博创科技股份有限公司 | A kind of adjustable light power wavelength division multiplexer and preparation method thereof |
| CN109742498A (en) * | 2019-02-28 | 2019-05-10 | 中电科仪器仪表有限公司 | A kind of waveguide step attenuator |
| CN113253389A (en) * | 2020-02-07 | 2021-08-13 | 华为技术有限公司 | Attenuation adjusting method and variable optical attenuator |
| US11460641B2 (en) | 2015-12-18 | 2022-10-04 | Alliance Fiber Optic Products, Inc. | Free-space optical collimator |
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| CN109613656A (en) * | 2018-12-20 | 2019-04-12 | 博创科技股份有限公司 | A kind of adjustable light power wavelength division multiplexer and preparation method thereof |
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| CN113253389A (en) * | 2020-02-07 | 2021-08-13 | 华为技术有限公司 | Attenuation adjusting method and variable optical attenuator |
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