CN101344619A - Reconfigurable optical add-drop multiplexer - Google Patents
Reconfigurable optical add-drop multiplexer Download PDFInfo
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- CN101344619A CN101344619A CNA2008101202541A CN200810120254A CN101344619A CN 101344619 A CN101344619 A CN 101344619A CN A2008101202541 A CNA2008101202541 A CN A2008101202541A CN 200810120254 A CN200810120254 A CN 200810120254A CN 101344619 A CN101344619 A CN 101344619A
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Abstract
A reconfigurable OADM comprises a port arranged at the same side of an apparatus, an optical-fiber unit connected with the port, an optical-fiber fastener used for fixing the optical-fiber unit, an optical-fiber collimator for guiding the light-wave transmission, a wave-filtering reflection module and an SCM control module. The wave-filtering reflection module comprises a rotary disc and a wave-filtering reflection unit which is centrally and symmetrically arranged on the disc; the optical-fiber unit consists of an inserting optical-fiber, an input optical-fiber, an output optical-fiber and a branching optical-fiber which are horizontally threaded through the optical-fiber fastener and are arranged sequentially from top to bottom on the same vertical face; the inserting optical-fiber and the branching optical-fiber are symmetrically arranged against an optical axis as well as the input optical-fiber and the output optical-fiber; the optical-fiber collimator is a GNIN collimating lens. The invention provides the reconfigurable OADM which is provided with the input, output, insertion and branching optical paths on the same plane and simultaneously realizes the direct-accessing, branching and insertion functions just in virtue of the single apparatus.
Description
(1) technical field
The present invention is a kind of inactive component that is applied in the WDM optical-fiber network, especially can realize message volume straight-through, divide down and insert operation, be applicable to message volume carried out node, the office of the Networks of Fiber Communications of full light transmission and exchange, occasion such as stand.
(2) background technology
Optical fiber communication has become present main information transmission mode with its high capacity, wide bandwidth, two-forty, low-loss.Development WDM all-optical network is the simplest and the most direct, the effective and efficient manner of present optical fiber communication dilatation.Along with the increasingly mature and practicability of DWDM technology,, produced the strong request that comes the supervising the network capacity at light territory layer for fear of the high cost of light-electrical-optical conversion and the restriction of breakthrough electronics speed bottleneck.Optical add-drop multiplexer (OADM) adapts to this requirement just and produces.
Optical add-drop multiplexer realizes descending selectively from transmission equipment the road to lead to local light signal, and the local user that sets out on a journey is simultaneously mail to the light signal of another node users.It can be divided into two classes, and a class is non-recollocation type (fixed), the one or more wavelength that can only fix up and down; Another kind of is recollocation type (reconfigurable), i.e. ROADM.Reconfigurable refer to quick selection be used to insert and divide under the ability of required wavelength, thereby allow dynamically to set up and cancel optical channel according to the demand of network, make operator when planned network, have dirigibility.A reconfigurable optical add-drop multiplexer will make optical-fiber network have bigger networking flexibility and survivability, can reduce the optical-fiber network networking cost simultaneously.
The patented technology of present existing optical add-drop multiplexer mostly is not reconfigurable type, and such as Chinese patent CN 1481101A, it adopts GRIN Lens and Fixed Wavelength Filter to realize dividing slotting filter function, once can only divide down/insert a fixed wave length.What Chinese patent CN1514563A disclosed is a kind of device of the slotting filter unit of a plurality of branches being realized the wavelength controllable function according to certain concatenated in order.The port of above-mentioned two patent institute invention devices all is positioned at the both sides of device, so the device architecture size is bigger than normal, the actual inconvenience of using.U.S. Pat 7184620 B1 disclose is the optical add-drop multiplexer spare that a kind of three ports and three ports are positioned at device the same side.This device is not reconfigurable yet, adopts wave filter, catoptron and optical fiber collimator to realize road function up and down.Because it adopts diamond array with three ports, the propagation that causes light makes that the assembling of catoptron is very difficult not in a plane.In addition, this device or as dividing down, or, can not use single above-mentioned three port optical add-drop multiplexer spares to realize this two functions simultaneously as inserting.Chinese patent 200710164618.1 discloses the reconfigurable optical add-drop multiplexer that a kind of multiport is following with the time-division or insert, its input, output and insertion/minute lower port all are positioned at the same side of device, but the port of this device also is to adopt diamond array, exist equally light not in a plane, the problem of catoptron assembling difficulty, and this device divides down or insertion needs to use different filtering reflecting module, can not realize leading directly to, divide down and insert function simultaneously.As seen above-mentioned four patented technologies all can't realize a kind of one-sided port and ROADM simple in structure, that be easy to realize.
(3) summary of the invention
In order to overcome the above-mentioned deficiency of prior art, the present invention proposes under a kind of input, output, insertion and the branch light path only can finish reconfigurable optical add-drop multiplexer straight-through, that divide down and insert function with individual devices simultaneously in same plane.
The technical solution adopted for the present invention to solve the technical problems is:
Reconfigurable optical add-drop multiplexer, the optical fiber collimator, filtering reflecting module and the single chip control module that comprise port, the optical fibre set that is connected with port that is positioned at device the same side, the optical fiber securing member that is used for fixing optical fibre set, guiding light wave transmissions, described filtering reflecting module comprises a rotary disk and center and is arranged in filtering reflector element on the described disk symmetrically, and described filtering reflector element is made up of wave filter and catoptron; Described single chip control module comprises the stepper motor that is connected with single-chip microcomputer, and described stepper motor connects described rotary disk; Described optical fibre set is located on the described optical fiber securing member one by level and inserts under optical fiber, input optical fibre, output optical fibre, the branch optical fiber and form, above-mentioned optical fiber is arranged in order in same vertical plane from top to bottom, described insertion optical fiber and branch optical fiber down arrange that about symmetrical described input optical fibre and output optical fibre are arranged about symmetrical; Described optical fiber collimator is the GRIN collimation lens, the refractive index of described GRIN collimation lens descends according to parabolic type is dull from the optical axis to the edge, and refractive index distributes axisymmetricly, the incident end face towards the optical fiber securing member of described GRIN collimation lens comprise the perpendicular section vertical that be positioned at the middle part and both sides with optical axis towards described port one end tilt on, the lower inclined plane section, on described, the lower inclined plane section is arranged about symmetrical, described perpendicular section and described input, the output optical fibre correspondence, on described, the lower inclined plane section is corresponding with optical fiber under described insertion optical fiber and the branch respectively, and the outgoing end face of described GRIN collimation lens is the plane vertical with optical axis.
The incident end face of described GRIN collimation lens is coated with the antireflective film that is used to reduce echo.Described input, output, branch become 8 ° inclination angle and are coated with antireflective film with the normal that inserts fiber end face down with the optical axis of optical fiber, to improve return loss.
Catoptron in the described filtering reflector element can be that angle is 2
Double mirror, the optical axis coincidence of its summit and described GRIN collimation lens.Two-face mirror becomes respectively with the optical axis of described GRIN collimation lens ±
The angle is respectively applied for the reflection insertion and divides signal down.Angle
Size relevant with the characteristic of described GRIN collimation lens, concrete numerical value by input, output, divide down and insert the propagation trajectories decision of light wave in the GRIN collimation lens.Through the design to described GRIN collimation lens, 2
The angle can equal 180 °, and promptly described catoptron is a plane mirror and vertical with the optical axis of described GRIN collimation lens.
Described optical fiber securing member is the mechanical hook-up that has four circular holes of vertical arrangement, and described 4 circular holes are respectively applied for fixing above-mentioned 4 optical fiber, and described 4 circular holes distribute axisymmetricly about optical axis.
Described disk is the precision metallic disk, and N accurate screw arranged on the disk, the distribution that is centrosymmetric, and described filtering reflector element is fastened on the disk with screw.
Wave filter in the described filtering reflector element is used to make the light-wave transmission of specific wavelength to pass wave filter, and allows the light wave of other wavelength reflect on the wave filter surface.The input light wave that reflects on the wave filter surface is as through connect signal.Input (insertion) light wave through filter transmission descends (insertion) signal, the catoptron in the described filtering reflector element of directive as branch.Wave filter in the described filtering reflector element is vertical with the optical axis of described GRIN collimation lens.
The effect of the catoptron in the described filtering reflector element is the light wave that reflection comes through filter transmission.Described catoptron will insert signal and merge with special angle reflection back and above-mentioned through connect signal, form new wavelength-division multiplex signals and will enter in the described GRIN collimation lens and propagate, until the optical fiber that spreads into the execution output function.After signal reflected with special angle under described catoptron will divide, enter and propagate in the described GRIN collimation lens, divide the optical fiber of function down until spreading into to carry out.
Described single chip control module is used the Single-chip Controlling stepper motor, drives the filtering reflecting module and rotates along precise guide rail, so that increase the stability of filtering reflecting module motion, reduces mechanical run.
Preferably, described wave filter is the dielectric multi-layer optical thin film wave filter.
Preferably, described catoptron is the broadband high reflective mirror.
Reconfigurable optical add-drop multiplexer of the present invention, GRIN collimation lens, dielectric multi-layer optical thin film wave filter and the catoptron of employing discrete can be realized the following and insertion of branch of wavelength simultaneously.Owing to used described GRIN collimation lens, only with individual devices can finish simultaneously straight-through, divide down and insert function, and input, output, insert and divide under light path all in same plane, realize.Adopt the Single-chip Controlling stepper motor, driving wave filter and the catoptron that combines with it rotate along precise guide rail, realize Dynamic Selection and configuration wavelength.
Beneficial effect of the present invention mainly shows: 1, as a kind of reconfigurable optical add-drop multiplexer, its input, output, divide down and the light path of inserting all in same plane, simplify the structure greatly, reduced the difficulty that mechanical hook-up is debug; 2, use individual devices realize simultaneously wavelength straight-through, divide down and insert, and input, output, divide down and insert port once determining, in use need not to adjust; 3, input, output, divide down and insert port and all be positioned at the same side, not only reduced the device architecture size, also make things convenient for controlling of device.
(4) description of drawings
Fig. 1 is the structural representation of reconfigurable optical add-drop multiplexer of the present invention.
Fig. 2 is the position layout viewing of optical fiber on the optical fiber securing member.
Fig. 3 is a GRIN collimating lens structures synoptic diagram.
Fig. 4 is a filtering reflecting module synoptic diagram.
Fig. 5 is the light path synoptic diagram of filtering reflector element.
The number in the figure explanation:
1-insertion port, 2-input port, 3-output port, 4-divide lower port, 5-optical fiber securing member, 6-GRIN collimation lens, 7-filtering reflecting module, 8-stepper motor, 9-single chip control module, 10-to insert fiber-optic fixing-hole, 11-input optical fibre fixed orifice, 12-output optical fibre fixed orifice, the following fiber-optic fixing-hole of 13-branch, 14-at any WDM standard wavelength λ
1Filtering reflector element, 15-wave filter, 16-catoptron, 17-perpendicular section, 18-ramp section, 19-lower inclined plane section.Input signal light rail mark, the preceding output signal light path track of 320-collimation, 420-collimated preceding branch flashlight rail mark down after insertion flashlight rail mark, 220-collimated behind flashlight rail mark, the 120-collimation under the branch in output signal light path track, the 410-GRIN lens in input signal light rail mark, the 310-GRIN lens in insertion flashlight rail mark, the 210-GRIN lens in optical fiber, the 110-GRIN lens under 100-insertion optical fiber, 200-input optical fibre, 300-output optical fibre, 400-divided
(5) embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1: reconfigurable optical add-drop multiplexer, the optical fiber collimator, filtering reflecting module 7 and the single chip control module 9 that comprise four ports, the optical fibre set that is connected with port that is positioned at device the same side, the optical fiber securing member 5 that is used for fixing optical fibre set, guiding light wave transmissions, described filtering reflecting module comprises a rotary disk and center and is arranged in filtering reflector element on the described disk symmetrically, and described filtering reflector element is made up of wave filter 15 and catoptron 16; Described single chip control module 9 comprises the stepper motor 8 that is connected with single-chip microcomputer, and described stepper motor connects described rotary disk; Described optical fibre set is located on the described optical fiber securing member one by level and inserts under optical fiber 100, input optical fibre 200, output optical fibre 300, the branch optical fiber 400 and form, above-mentioned optical fiber is arranged in order in same vertical plane from top to bottom, optical fiber 400 is about the symmetrical layout down with branch for described insertion optical fiber 100, and described input optical fibre 200 is arranged about symmetrical with output optical fibre 300; Described optical fiber collimator is a GRIN collimation lens 6, the refractive index of described GRIN collimation lens 6 descends according to parabolic type is dull from the optical axis to the edge, and refractive index distributes axisymmetricly, the incident end face towards optical fiber securing member 5 of described GRIN collimation lens 6 comprise the perpendicular section 17 vertical that be positioned at the middle part and both sides with optical axis towards described port one end tilt on, the lower inclined plane section, described ramp section 18, lower inclined plane section 19 is arranged about symmetrical, described perpendicular section and described input, the output optical fibre correspondence, on described, the lower inclined plane section is corresponding with optical fiber under described insertion optical fiber and the branch respectively, and the outgoing end face of described GRIN collimation lens is the plane vertical with optical axis.
The incident end face of described GRIN collimation lens 6 is coated with the antireflective film that is used to reduce echo.Described input, output, branch become 8 ° inclination angle and are coated with antireflective film with the normal that inserts fiber end face down with the optical axis of optical fiber, to improve return loss.
Described four port ones, 2,3,4 respectively with insert optical fiber 100, input optical fibre 200, output optical fibre 300, divide down that optical fiber 400 links to each other, in order to transmission send into (from) insertion of GRIN collimation lens 6 and input (output and divide under) signal.Described four ports are vertical arrangement in device the same side, and described four optical fiber are fixed among the optical fiber securing member 5.
With reference to Fig. 2,4 fiber-optic fixing-holes of vertical arrangement are arranged in the described optical fiber securing member, be followed successively by from top to bottom and insert fiber-optic fixing-hole 10, input optical fibre fixed orifice 11, output optical fibre fixed orifice 12 and divide fiber-optic fixing-hole 13 down.Fiber-optic fixing-hole 10 and fiber-optic fixing-hole 13, input optical fibre fixed orifice 11 and output optical fibre fixed orifice 12 are respectively about symmetrical.Spacing between described each hole is by the characteristic decision of GRIN collimation lens.
With reference to Fig. 3, the round bar shape graded index lenticule that described GRIN collimation lens is r by a radius processes.The left side be the lens incident end face among Fig. 3, and its center is one and highly is 2h, the plane vertical with optical axis, up and down both sides for to become respectively with optical axis ± (90 °-θ) plane at pitch angle.Lens center axial length z.Tiltangle is that (abcd matrix by gradual index lens calculates as can be known than middle two-way light little for angle when making that two-way light is from the outgoing of graded index lenticule up and down, as there is not a tiltangle, the emergent ray angle must be greater than the intermediate rays angle up and down), concrete little what can control by length z.After z determines, can obtain described optical fiber head apart from the lenticular optimum distance of graded index through the lenticular transformation calculations of graded index by Gaussian beam.The selection of height 2h need consider that mainly the overlapping phenomenon does not take place four road light beams that entered by optical fiber head in the graded index lenticule.It is enough big that radius r is wanted, to guarantee that light can not reflect at periphery about the graded index lenticule up and down.
Described GRIN collimation lens utilizes the structure and the optical characteristics of its particular design, is determining the track of light wave portion transmission within it, so that guiding input and insert signal directive filtering reflecting module 7, and signal guidance arrives each self-corresponding optical fiber under will export and divide.The property of GRIN collimation lens can guarantee that the ray trajectory under above-mentioned insertion, input, output and the branch all is positioned at same plane.
With reference to Fig. 4, described filtering reflecting module comprises N filtering reflector element (N=8 shown in Figure 4), and distribution is centrosymmetric.With reference to Fig. 5, described filtering reflector element is made up of a wave filter 15 and a broadband high reflective mirror 16.Described broadband high reflective mirror 16 is that angle is 2
Double mirror, the optical axis coincidence of its summit and described GRIN collimation lens.Two-face mirror becomes respectively with the optical axis of described GRIN collimation lens ±
The angle is respectively applied for the reflection insertion and divides signal down.With reference to Fig. 1 and Fig. 5, incide the plated film face of described wave filter 15 through the input signal behind the grin lens along collimation back input signal light rail mark 220, the light wave of its reflection is as through connect signal.Insert 120 transmissions from described wave filter 15 of flashlight rail mark along the collimation back through the insertion signal behind the grin lens, incide on the catoptron 16, the light wave of its reflection overlaps with above-mentioned through connect signal by wave filter 15 backs once more, form output signal, enter in the described GRIN collimation lens along the preceding output signal light path track 320 of collimation then and propagate, until spreading into output optical fibre 300.Input lightwave signal through filter transmission descends signal as branch, the described catoptron 16 of directive, after its reflecting light passed through wave filter 15 once more, flashlight rail mark 420 was reflected into described GRIN collimation lens under preceding the branch along collimating again, until spreading into the optical fiber 400 of carrying out function under the branch.
With reference to Fig. 1, described single chip control module 9 is utilized Single-chip Controlling stepper motor 8, drives the filtering reflecting module and rotates along precise guide rail, in order to Dynamic Selection institute's particular job wavelength to be processed and the add drop multiplex function that will carry out.
Wavelength-division multiplex signals with 8 wavelength is an example, and it is as follows to describe the course of work of the present invention:
A branch of λ that comprises
1λ
2λ
3λ
4λ
5λ
6λ
7λ
8The multiplexed signals of eight wavelength is input port 2 in Fig. 1, imports reconfigurable optical add-drop multiplexer of the present invention.Through being fixed on input optical fibre 200 on the optical fiber securing member 5, that link to each other with input port 2, transmission enters GRIN collimation lens 6, and input signal light rail mark 210 is propagated forward in the GRIN collimation lens in the grin lens, after arriving GRIN collimation lens output end face, the specific filtering reflector element on outgoing at a certain angle and the directive filtering reflecting module 7.With reference to Fig. 4, suppose that filtering reflector element 14 is at operation wavelength λ
1The filtering reflector element.When the filtering reflecting module rotates to the position of filtering reflector element 14, with reference to Fig. 1 and Fig. 5, from the light beam (λ of outgoing of GRIN collimation lens and directive filtering reflecting module
1λ
2λ
3λ
4λ
5λ
6λ
7λ
8), collimation back, edge input signal light rail mark 220 is radiated at the plated film face of the wave filter 15 of filtering reflector element, wherein λ
2λ
3λ
4λ
5λ
6λ
7λ
8Reflection at a certain angle constitutes through connect signal.Light beam λ through wave filter 15 transmissions of filtering reflector element
1, forward-propagating, and catoptron 16 surfaces of directive filtering reflector element, see through wave filter 15 after the reflection once more, inject GRIN collimation lens 6 along flashlight rail mark 420 under the preceding branch of collimation, flashlight rail mark 410 propagates into optical fiber 4 under the branch along dividing down in the grin lens then, until minute lower port 4.
Meanwhile, wavelength also is λ
1The insertion signal in Fig. 1, insert port one, import reconfigurable optical add-drop multiplexer of the present invention.Through being fixed on insertion optical fiber 100 on the optical fiber securing member 5, that link to each other with the insertion port one, transmission enters GRIN collimation lens 6, and in grin lens, insert flashlight rail mark 110 propagation forward in the GRIN collimation lens, after arriving GRIN collimation lens output end face, along the filtering reflector element 14 on the collimation back insertion flashlight rail mark 120 directive filtering reflecting module 7.With reference to Fig. 1 and Fig. 5, insert signal (λ
1) see through wave filter 15, incide on the catoptron 16.Through catoptron 16 reflections, with above-mentioned through connect signal (λ
2λ
3λ
4λ
5λ
6λ
7λ
8) merging formation output signal (λ
1λ
2λ
3λ
4λ
5λ
6λ
7λ
8).Output signal (λ
1λ
2λ
3λ
4λ
5λ
6λ
7λ
8) inject GRIN collimation lens 6 along the preceding output signal light path track 320 of collimation, propagate into output optical fibre 300 along output signal light path track 310 in the grin lens again, until output port 3.
Claims (8)
1, reconfigurable optical add-drop multiplexer, the optical fiber collimator, filtering reflecting module and the single chip control module that comprise port, the optical fibre set that is connected with port that is positioned at device the same side, the optical fiber securing member that is used for fixing optical fibre set, guiding light wave transmissions, described filtering reflecting module comprises a rotary disk and center and is arranged in filtering reflector element on the described disk symmetrically, and described filtering reflector element is made up of wave filter and catoptron; Described single chip control module comprises the stepper motor that is connected with single-chip microcomputer, and described stepper motor connects described rotary disk; It is characterized in that: described optical fibre set is located on the described optical fiber securing member one by level and inserts under optical fiber, input optical fibre, output optical fibre, the branch optical fiber and form, above-mentioned optical fiber is arranged in order in same vertical plane from top to bottom, described insertion optical fiber and branch optical fiber down arrange that about symmetrical described input optical fibre and output optical fibre are arranged about symmetrical; Described optical fiber collimator is the GRIN collimation lens, the refractive index of described GRIN collimation lens descends according to parabolic type is dull from the optical axis to the edge, and refractive index distributes axisymmetricly, the incident end face towards the optical fiber securing member of described GRIN collimation lens comprise the perpendicular section vertical that be positioned at the middle part and both sides with optical axis towards described port one end tilt on, the lower inclined plane section, on described, the lower inclined plane section is arranged about symmetrical, described perpendicular section and described input, the output optical fibre correspondence, on described, the lower inclined plane section is corresponding with optical fiber under described insertion optical fiber and the branch respectively, and the outgoing end face of described GRIN collimation lens is the plane vertical with optical axis.
2, reconfigurable optical add-drop multiplexer as claimed in claim 1 is characterized in that: the incident end face of described GRIN collimation lens is coated with the antireflective film that is used to reduce echo.
3, reconfigurable optical add-drop multiplexer as claimed in claim 1 or 2 is characterized in that: the catoptron in the described filtering reflector element is that angle is
Double mirror, the optical axis coincidence of its summit and described GRIN collimation lens, two-face mirror becomes respectively with the optical axis of described GRIN collimation lens ±
The angle is respectively applied for the reflection insertion and divides signal down.
4, reconfigurable optical add-drop multiplexer as claimed in claim 3 is characterized in that: described input, output, branch become 8 ° inclination angle and are coated with antireflective film with the normal that inserts fiber end face down with the optical axis of optical fiber, to improve return loss.
5, reconfigurable optical add-drop multiplexer as claimed in claim 4 is characterized in that: described optical fiber securing member is the mechanical hook-up that has four circular holes of vertical arrangement, and described 4 circular holes are respectively applied for fixing above-mentioned 4 optical fiber.
6, reconfigurable optical add-drop multiplexer as claimed in claim 5 is characterized in that: described disk is the precision metallic disk, and N accurate screw arranged on the disk, the distribution that is centrosymmetric, and described filtering reflector element is fastened on the disk with screw.
7, reconfigurable optical add-drop multiplexer as claimed in claim 6 is characterized in that: described wave filter is the dielectric multi-layer optical thin film wave filter.
8, reconfigurable optical add-drop multiplexer as claimed in claim 7 is characterized in that: described catoptron is the broadband high reflective mirror.
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| CN200810120254A CN100593738C (en) | 2008-08-14 | 2008-08-14 | Reconfigurable optical add-drop multiplexer |
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| CN200810120254A CN100593738C (en) | 2008-08-14 | 2008-08-14 | Reconfigurable optical add-drop multiplexer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291821A (en) * | 2016-08-03 | 2017-01-04 | 北京航空航天大学 | A kind of hollow-core photonic crystal fiber bonder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498682B2 (en) * | 1998-12-28 | 2002-12-24 | At&T Corp. | Tunable add/drop filter |
| TW536642B (en) * | 2002-04-19 | 2003-06-11 | Ritek Corp | Optical switch |
| US7039271B2 (en) * | 2002-11-27 | 2006-05-02 | Oplink Communications, Inc. | Reduced element optical add-drop multiplexer |
| US7184620B1 (en) * | 2002-11-27 | 2007-02-27 | Oplink Communications, Inc. | 3-port optical add-drop multiplexer (OADM) |
| CN101236277B (en) * | 2007-12-25 | 2010-09-15 | 浙江工业大学 | Structure reconfigurable optical add/drop multiplexer |
| CN100501469C (en) * | 2007-12-25 | 2009-06-17 | 浙江工业大学 | Reconfigurable optical add-drop multiplexer which multiport can be extracted or pluggable |
| CN201255779Y (en) * | 2008-08-14 | 2009-06-10 | 浙江工业大学 | Optical add-drop multiplexer capable of reconfiguration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106291821A (en) * | 2016-08-03 | 2017-01-04 | 北京航空航天大学 | A kind of hollow-core photonic crystal fiber bonder |
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