CN104714280A - Optical divider - Google Patents

Optical divider Download PDF

Info

Publication number
CN104714280A
CN104714280A CN201310684400.4A CN201310684400A CN104714280A CN 104714280 A CN104714280 A CN 104714280A CN 201310684400 A CN201310684400 A CN 201310684400A CN 104714280 A CN104714280 A CN 104714280A
Authority
CN
China
Prior art keywords
branching device
optical branching
optical
waveguide
coupled zone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201310684400.4A
Other languages
Chinese (zh)
Other versions
CN104714280B (en
Inventor
李晗
柳晟
王磊
张德朝
李允博
韩柳燕
程伟强
叶雯
王世光
李遥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Mobile Communications Group Co Ltd
Original Assignee
China Mobile Communications Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Mobile Communications Group Co Ltd filed Critical China Mobile Communications Group Co Ltd
Priority to CN201310684400.4A priority Critical patent/CN104714280B/en
Publication of CN104714280A publication Critical patent/CN104714280A/en
Application granted granted Critical
Publication of CN104714280B publication Critical patent/CN104714280B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/125—Bends, branchings or intersections
    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12133—Functions
    • G02B2006/1215—Splitter

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

The invention provides an optical divider. The optical divider comprises an input port, two output ports and a coupling area arranged between the input port and the output ports, wherein the ratio of the output light power of a single output end of the optical diver to the total output light power periodically changes along with changes of wavelengths of optical waves within an assigned wavelength range. Due to the application of the optical divider, the splitting ratio of the optical divider can be dynamically adjustable in many cycles.

Description

A kind of optical branching device
Technical field
The application relates to mobile communication technology field, particularly relates to a kind of optical branching device.
Background technology
In the prior art, EPON (PON) technology is the mainstream technology realizing intelligent acess (FTTx).Fig. 1 is the structural representation of EPON of the prior art, as shown in Figure 1, the topological structure of typical PON system is generally tree topology, generally be made up of local side apparatus optical line terminal (OLT), ustomer premises access equipment optical network unit (ONU) and Optical Distribution Network (ODN), " passive " wherein refers in ODN not containing any active electronic device and electronic power supply, all divided the Passive Optical Components such as/combiner (Splitter) to form by optical fiber and light, ODN wherein generally by optical fiber and light divide/Passive Optical Components such as combiner forms.
The splitting ratio of the optical branching device used in above-mentioned PON refers to the ratio of luminous power on the circuitry number of optical branching device and each branch road.In the prior art, optical branching device is the fixing optical splitter of splitting ratio, from 1:2 ~ 1:128,2:2 ~ 2:128 not etc.Existing optical branching device is generally all by the mode integration realization of the optical coupling unit cascade of multistage 1 × 2 in inner structure.The light splitting ratio of the different branches of optical branching device of the prior art and the circuitry number of light splitting are all changeless, and this optical branching device is insensitive to the wavelength within the scope of 1260 ~ 1630nm, and splitting ratio all remains unchanged.
Splitting ratio due to optical branching device of the prior art is all generally changeless, therefore will occur some problems of the following stated in the actual deployment of PON:
1, the number of users owing to accessing under single PON mouth varies, therefore be the optical branching device needing to prepare or use the different light splitting type of 1:2 ~ 1:128,2:2 ~ 2:128 etc. tens kinds carrying out network design and standby redundancy, the O&M costs such as standby redundancy are also higher.
2, it is right that the number of users accessed as FTTx under single PON mouth changes, and proposes adjustment requirement by the splitting ratio of optical branching device.In the prior art, for the scene that number of users increases, can newly superpose deployment optical branching device, but this settling mode needs to consume more valuable trunk incoming fiber optic; Also the optical branching device with large splitting ratio can be directly disposed when initial deployment in prior art, though but this settling mode will cause a large amount of scene under optical branching device port use less, but up-downgoing Insertion Loss is still large splitting ratio Insertion Loss, thus causes tight power budget.
3, under single PON mouth there is larger difference in the distance of different user, or there is larger difference (as disposed the bending loss etc. during construction) in the link load of different Distribution fibers, therefore power budget generally all can only calculate according to the poorest link, therefore the waste of close together or the less link power budget of loss will be caused, even possibility emergent power overload problem, also proposes challenge to the automatic growth control (AGC) of optical line terminal (OLT) receiver simultaneously.
In summary, because optical branching device of the prior art has shortcoming as above, therefore how to propose a kind of optical branching device with better performance, become in this area the problem needing solution badly.
Summary of the invention
In view of this, the invention provides a kind of optical branching device, thus the multicycle that can realize the splitting ratio of optical branching device is dynamically adjustable.
Technical scheme of the present invention is specifically achieved in that
A kind of optical branching device, this optical branching device at least comprises: input port, two output ports and the coupled zone be arranged between input port and output port;
Wherein, total the Output optical power of single output terminal of described optical branching device and the change of generating period with the change of the optical wavelength in used designated wavelength range of the ratio of Output optical power.
Preferably, the waveguide spacing of described coupled zone is less than typical duct spacing.
Preferably, at least one waveguide of described coupled zone, the doping content of GeO2 is less than typical dopant concentrations.
Preferably, in two waveguides of described coupled zone, the doping content of GeO2 reduces 10 ~ 20mol% than typical dopant concentrations.
Preferably, described designated wavelength range is 1260 ~ 1630nm.
Preferably, described optical branching device is fused tapered optical branching device or parallel double waveguide optical splitter.
Preferably, when described optical branching device is parallel double waveguide optical splitter, the waveguide of described coupled zone is width gradual change type structure, and the duct width of described coupled zone is more than or equal to typical duct width.
Preferably, the variable quantity of described duct width is 1 ~ 20 micron.
Preferably, the width gradual change type structure of the waveguide of described coupled zone is arc width grading structure or linear extent grading structure.
Preferably, when described optical branching device is parallel double waveguide optical splitter, the doping content of the GeO2 at the middle part of two waveguides of described optical branching device coupled zone reduces 10 ~ 20mol% than typical dopant concentrations
As seen from the above technical solution, in the inventive solutions, because in the duct width of the coupled zone to optical branching device, waveguide spacing and/or waveguide, the doping content etc. of GeO2 is improved, total the change with the optical wavelength in used designated wavelength range changed with the Output optical power of single output terminal and the ratio of Output optical power that make described optical branching device.Therefore, can, by using the mode of the light wave of the different wave length in designated wavelength range, make described optical branching device have different splitting ratios, thus the multicycle achieving the splitting ratio of optical branching device be dynamically adjustable.So, if use the optical branching device that the above-mentioned splitting ratio multicycle is dynamically adjustable in the actual deployment of PON, just in network design, operation maintenance and standby redundancy, only can adopt a kind of or a few physics splitting ratio optical branching device, thus greatly reduce the kind needing the optical branching device preparing or use, greatly reduce equipment cost and O&M cost.In addition, by the optical branching device using the above-mentioned splitting ratio multicycle dynamically adjustable, can according to factors such as the number of users under single PON mouth, user's transmission ranges, the suitably logic splitting ratio of configuration optical branching device, with matching network demand.In addition, when logic splitting ratio is less than physics splitting ratio, the reduction with logic splitting ratio linearly declines by its insertion loss, and no matter uses several output port in traditional optical branching device, and its insertion loss all cannot decline.Moreover, by the optical branching device using the above-mentioned splitting ratio multicycle dynamically adjustable, the luminous power of dynamic conditioning different branch can also be carried out by the change of splitting ratio, thus mate the link power budget of each branch road better, network design is become more flexibly with convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical branching device of the prior art.
Fig. 2 is the structural representation of the fused tapered optical branching device in the embodiment of the present invention.
Fig. 3 is the structural representation of the planar waveguide-type optical branching device in the embodiment of the present invention.
Fig. 4 is the schematic diagram that the luminous power ratio of optical branching device output terminal in the embodiment of the present invention changes with wavelength.
Fig. 5 is the schematic diagram of the waveguide spacing reducing fused tapered optical branching device coupled zone in the embodiment of the present invention.
Fig. 6 is the schematic diagram of the width gradual change type structure of the waveguide of parallel double waveguide optical splitter coupled zone in the embodiment of the present invention.
Fig. 7 be change parallel double waveguide optical splitter coupled zone in the embodiment of the present invention waveguide in the middle part of GeO 2the schematic diagram of doping content.
Embodiment
For making technical scheme of the present invention and advantage clearly understand, below in conjunction with drawings and the specific embodiments, the present invention is further detailed explanation.
Optical branching device generally can be divided into fused tapered (FBT according to principle of work, Fused Biconical Taper) optical branching device and planar waveguide-type (PLC) optical branching device these two kinds, and multiple optical branching device also connects by the mode of cascade and forms a large optical branching device.
Fig. 2 is the structural representation of the fused tapered optical branching device in the embodiment of the present invention.As shown in Figure 2, fused tapered optical branching device is drawn close with certain method by the optical fiber of two (or more than two) removing coat, and melting at high temperature heat, simultaneously to two side stretchings, finally forms the special Wave guide structure of bicone form in heating zone.Therefore, as shown in Figure 2, the optical branching device in the embodiment of the present invention can mainly comprise: input port, two output ports and a coupled zone.A gradation zone is also provided with in the both sides of coupled zone.Suppose that the luminous power of input port is P0, the luminous power of the first output port is P1, and the luminous power of the second output port is P2, and coupled zone length is w, and transition region length is L; Because the fiber core (i.e. waveguide) in coupled zone is melted elongation, the radius of core diameter a(and fiber core, half for duct width) diminish, even if therefore the single mode of light signal also has part and propagates outward at the fiber core of coupled zone, thus to be coupled in another fiber core closed on.So the working mechanism of fused tapered optical branching device can describe with the coupled wave equation of as described below two light waves:
P 1 ( z ) P 0 = 1 - κ 2 γ 2 sin 2 γz , P 2 ( z ) P 0 = κ 2 γ 2 sin 2 γz ; - - - ( 1 )
Wherein, Δ β=β 1-β 2, Δ β is for propagating wave vector not matching degree, and k is coupling coefficient.
If the refractive index of fibre core and covering is respectively n in optical fiber parameter 1and n 2, the distance between two fiber cores is d, and fiber core radius (i.e. core diameter) is a, and operation wavelength is λ 0, then k can specifically be expressed as:
κ ( d ) = λ 0 2 πn 1 U 2 a 2 V 2 K 0 ( Wd / a ) K 1 2 ( W ) - - - ( 2 )
Wherein, eigenvalue k 1for i rank Bessel's function, n efor effective refractive index.
In addition, coupling coefficient k can also be similar to by following experimental formula:
κ ( d , V ) = π 2 δ a e - ( A + B d ~ + C d ~ 2 ) - - - ( 3 )
Wherein, A=5.2789-3.663V+0.3841V 2, B=-0.7768+1.2252V-0.0152V 2, C=-0.0175-0.0064V-0.00009V 2,
At the added losses not considering to be coupled, and when Δ β ≠ 0, output power and power input will have relation as described below:
P 1＝P 0·cos 2(κz)，P 2＝P 0·sin 2(κz) （4）
Wherein, z is the length of coupling core diameter, and k is coupling coefficient.From above-mentioned formula (4), when accurately setting the numerical value of parameters, make time, the luminous power of two output terminals can be made equal, thus make described optical branching device realize even light splitting.
For above-mentioned fused tapered optical branching device, in the manufacture process of reality, varied due to manufactured materials and/or manufacturing process, therefore various parameters (total length etc. of the length of coupled zone when such as, P1 and P2 is equal, core diameter, coupled zone and transition region) and its manufactured materials of fused tapered optical branching device and/or manufacturing process closely related.Under normal circumstances, the parameters of the fused tapered optical branching device of same manufactured materials and the manufacture of same manufacturing process is used to have the value determined.Such as, when manufactured materials and manufacturing process are determined, the distance d between two waveguides (i.e. fiber core) of the coupled zone of existing fused tapered optical branching device and core diameter (i.e. the half of duct width) a also determines, the value of d/a is generally also determined.Such as, the representative value of the d/a of existing fused tapered optical branching device is generally 4.In addition, the middle GeO of two waveguides (i.e. fiber core) of coupled zone 2doping content generally also determine, and GeO in two waveguides 2doping content be also generally equal.Therefore, the duct width b of coupled zone waveguide time existing fused tapered optical branching device even light splitting (namely P1 and P2 is equal) can be called typical duct width, distance d between two waveguides of coupled zone when evenly dividing light is called typical duct spacing, and GeO in two waveguides of coupled zone when existing fused tapered optical branching device evenly being divided light 2doping content be called typical dopant concentrations.
In addition, planar waveguide-type optical branching device adopts photoetching technique to form optical waveguide on medium or semiconductor substrate, thus realize light splitting function; An optical branching device can be formed by multiple optical branching device cascade.Planar waveguide-type optical branching device generally can be divided into Y type optical branching device and parallel twin-guide optical branching device.In a particular embodiment of the present invention, only parallel double waveguide optical splitter is used.
Fig. 3 is the structural representation of the parallel double waveguide optical splitter in the embodiment of the present invention.As shown in Figure 3, also comprise an input port, two output ports and coupled zone in parallel double waveguide optical splitter, two optical waveguides are close to each other in coupled zone.The principle of work of parallel double waveguide optical splitter is similar to fused tapered optical branching device, also can be described by coupledwave equation.Only there is a pattern in incident light: basic mode (i.e. 0 rank mould) in incident single mode waveguide.When this 0 rank mould arrives coupled zone, two super models as shown in Figure 3 will be motivated in coupled zone: even mould and Qi Mo, and these two super models has the propagation constant of almost equal (being bordering on degeneracy).Therefore, GeO in distance d and/or two waveguide between two waveguides of coupled zone accurately controlling above-mentioned parallel double waveguide optical splitter 2doping content time, the luminous power P1 of two output terminals and P2 can be made equal, thus make described parallel double waveguide optical splitter realize even light splitting.
Equally, in the manufacture process of reality, varied due to manufactured materials and/or manufacturing process, therefore various parameters (such as, the GeO in the duct width of coupled zone waveguide, waveguide of parallel double waveguide optical splitter 2doping content etc.) with its manufactured materials and/or manufacturing process closely related.Under normal circumstances, the parameters of the parallel double waveguide optical splitter of same manufactured materials and the manufacture of same manufacturing process is used to have the value determined.Such as, when manufactured materials and manufacturing process are determined, the duct width of two waveguides of the coupled zone of existing parallel double waveguide optical splitter is generally all determined, GeO in two waveguides 2doping content generally also determine.
So, also the duct width b of coupled zone waveguide time even for parallel double waveguide optical splitter light splitting (namely P1 and P2 is equal) can be called typical duct width, distance d between two waveguides of coupled zone when evenly dividing light is called typical duct spacing, and GeO in two waveguides of coupled zone when existing parallel double waveguide optical splitter evenly being divided light 2doping content be called typical dopant concentrations.
But, when above-mentioned fused tapered optical branching device has various representative value (such as with parallel twin-guide optical branching device, typical duct width, typical duct spacing, typical dopant concentrations etc.) time, although even light splitting can be realized, but now when using wavelength coverage to be the light wave transmissions signal of 1260 ~ 1630nm, the splitting ratio of above-mentioned two kinds of optical branching devices will remain unchanged, and namely the wavelength sensitivity of the splitting ratio of above-mentioned two kinds of optical branching devices is very low.
In order to improve the wavelength sensitivity of the splitting ratio of optical branching device, in the inventive solutions, GeO in the waveguide carried out further improvement by above-mentioned two kinds of optical branching devices, suitably reduced the waveguide spacing of coupled zone, increasing duct width and/or change coupled zone 2doping content, thus make the splitting ratio change of generating period by the change of the wavelength along with used light wave of optical branching device after improving.Such as, make the ratio of the Output optical power of the single output terminal of the optical branching device after described improvement and total Output optical power in designated wavelength range (such as, 1260 ~ 1630nm) periodically change from 0 ~ 1, the optical branching device that the final formation splitting ratio multicycle is dynamically adjustable.
Fig. 4 is the schematic diagram that the luminous power ratio of optical branching device output terminal in the embodiment of the present invention changes with wavelength.As shown in Figure 4, when the Output optical power of the single output terminal of optical branching device and the ratio of total Output optical power in designated wavelength range from 0 ~ 1 generating period change time, can by designated wavelength range (such as, 1260 ~ 1630nm) multiple wavelength be divided into multiple groups according to corresponding cycle T, make for each wavelength in same group, optical branching device has identical splitting ratio.Such as, when the optical wavelength that optical branching device uses is for arbitrary wavelength (λ 0+nT) in A2 group, the single output terminal of this optical branching device (such as, the first output terminal in Fig. 2) Output optical power and the ratio of total Output optical power be 0.5, the i.e. luminous power of two output terminals equal (even light splitting), T is wherein the length in the cycle that splitting ratio changes, and n is integer; When the optical wavelength that optical branching device uses is for arbitrary wavelength (λ 1+nT) in A3 group, the Output optical power of the single output terminal of this optical branching device and the ratio of total Output optical power are 1, namely all input light all exports from this output terminal, and another output terminal does not then have light output; When the optical wavelength that optical branching device uses is for arbitrary wavelength (λ 2+nT) in A1 group, the Output optical power of the single output terminal of this optical branching device and the ratio of total Output optical power are 0, namely this output terminal does not have light output, and all input light all exports from another output terminal.In addition, optical wavelength in all right other region except A1, A2 and A3 group shown in choice for use Fig. 4, now, the Output optical power of the single output terminal of this optical branching device and the ratio of total Output optical power will between 0 to 1, concrete situation and above-mentioned description similar, do not repeat them here.
As from the foregoing, in a particular embodiment of the present invention, the optical branching device that the described splitting ratio multicycle is dynamically adjustable at least comprises: input port, two output ports and the coupled zone be arranged between input port and output port.
Wherein, total the Output optical power of single output terminal of described optical branching device and the change of generating period with the change of the optical wavelength in used designated wavelength range of the ratio of Output optical power.
Preferably, in a particular embodiment of the present invention, the waveguide spacing of described coupled zone is less than typical duct spacing.
Preferably, in a particular embodiment of the present invention, GeO at least one waveguide of described coupled zone 2doping content be less than typical dopant concentrations.
Preferably, in a particular embodiment of the present invention, described designated wavelength range is 1260 ~ 1630nm.
Preferably, in a particular embodiment of the present invention, when the optical branching device that the described splitting ratio multicycle is dynamically adjustable is fused tapered optical branching device, the side of two of a coupled zone optical fiber can be polished, and then melting is got up, to reduce two fiber core distance d, thus the waveguide spacing of coupled zone can be reduced, increase coupling coefficient κ, realize splitting ratio to wavelength sensitive.As shown in Figure 5, the waveguide spacing of the coupled zone after above-mentioned process is less than typical duct spacing.
In general, the representative value of the ratio d/a of the waveguide spacing of existing fused tapered optical branching device and core diameter (i.e. the half of duct width) is generally 4, in the preferred embodiment, when reducing the waveguide spacing of coupled zone, when making the value of the ratio d/a of described waveguide spacing and core diameter be about 2 (now, the ratio of described waveguide spacing and duct width is about 1), the Output optical power of single output terminal of the optical branching device after improving and the ratio of total Output optical power can be made periodically to change from 0 ~ 1 in designated wavelength range, and effectively can shorten splitting ratio and the wavelength relationship period of a function of optical branching device.
In addition, in another one preferred embodiment of the present invention, when the optical branching device that the described splitting ratio multicycle is dynamically adjustable is fused tapered optical branching device, can by GeO in two optical fiber of change coupled zone 2doping content, periodically change from 0 ~ 1 in designated wavelength range to make the Output optical power of single output terminal of optical branching device after improving and the ratio of total Output optical power.
Such as, preferably, in a particular embodiment of the present invention, the middle GeO of two optical fiber (i.e. waveguide) of described optical branching device coupled zone 2doping content than typical dopant concentrations reduce 10 ~ 20mol%, such as, about 15mol% can be reduced, now, the SiO in waveguide can be made 2variations in refractive index about 0.02, thus the Output optical power of single output terminal of optical branching device after improving and the ratio of total Output optical power can be made periodically to change from 0 ~ 1 in designated wavelength range.
Again such as, preferably, in a particular embodiment of the present invention, GeO in any optical fiber can be reduced in two optical fiber (i.e. waveguide) of described optical branching device coupled zone 2doping content, namely in two optical fiber, carry out asymmetric doped with Ge O 2, make the doping content in two optical fiber unequal, thus make the transmission wave vector β supported in two optical fiber different.When Δ β ≠ 0, the parameter of two optical fiber is not identical, although the light being less than 100% can be coupled between two optical fiber, but now splitting ratio period of change can shorten, the ratio of Output optical power and total Output optical power of the single output terminal of the optical branching device after therefore improving in designated wavelength range will the change of generating period.
Fused tapered optical branching device after above-mentioned process, the Output optical power of its single output terminal and the ratio of total Output optical power change from 0 ~ 1 generating period in designated wavelength range, therefore, can by using the mode of the light wave of the different wave length in designated wavelength range, make described optical branching device have different splitting ratios, thus the multicycle achieving the splitting ratio of optical branching device is dynamically adjustable.
Preferably, in a particular embodiment of the present invention, when the optical branching device that the described splitting ratio multicycle is dynamically adjustable is parallel double waveguide optical splitter, can when manufacturing described parallel double waveguide optical splitter, the waveguide spacing (distances namely between two waveguides) of direct change coupled zone, makes described parallel double waveguide optical splitter be less than typical duct spacing in the waveguide spacing of coupled zone.Through improved parallel double waveguide optical splitter, because the waveguide spacing of coupled zone is less than typical duct spacing, thus the Energy Coupling between two waveguides increasing coupled zone, thus shorten the splitting ratio of optical branching device and wavelength relationship period of a function (such as, make cycle time 2 ~ 5 times), make the ratio of the Output optical power of the single output terminal of this optical branching device and total Output optical power also by the change of generating period with the change of the optical wavelength in used designated wavelength range, therefore, can by using the mode of the light wave of the different wave length in designated wavelength range, described optical branching device is made to have different splitting ratios, thus the multicycle achieving the splitting ratio of optical branching device is dynamically adjustable.
In addition, in another one preferred embodiment of the present invention, when the optical branching device that the described splitting ratio multicycle is dynamically adjustable is parallel double waveguide optical splitter, also can when manufacturing described parallel double waveguide optical splitter, the duct width of direct change coupled zone, makes described parallel double waveguide optical splitter be greater than typical duct width at the duct width of coupled zone.Through improved parallel double waveguide optical splitter, duct width due to coupled zone is greater than typical duct width, thus the Output optical power of the single output terminal of optical branching device and the ratio of total Output optical power are also by the change of generating period with the change of the optical wavelength in used designated wavelength range, therefore, can by using the mode of the light wave of the different wave length in designated wavelength range, make described optical branching device have different splitting ratios, thus the multicycle achieving the splitting ratio of optical branching device is dynamically adjustable.
Preferably, in a particular embodiment of the present invention, when the optical branching device that the described splitting ratio multicycle is dynamically adjustable is parallel double waveguide optical splitter, the waveguide of described coupled zone is width gradual change type structure, and the duct width of described coupled zone is more than or equal to typical duct width.In four preferred embodiments as shown in Figure 6, the width of the waveguide of described coupled zone is not evenly equal, but has the feature of width gradual change.Preferably, in a particular embodiment of the present invention, the variable quantity of described duct width is generally 1 ~ 20 micron.In addition, in the preferred embodiment, the width gradual change type structure of the waveguide of described coupled zone is arc width grading structure or linear extent grading structure.Waveguide due to described coupled zone is width gradual change type structure, thus the condition of continuity of field can be met, high-order mode can not have been excited, and be only that the width of 0 rank mould constantly broadens along with broadening of waveguide, thus increase mould field width degree, Energy Coupling between two waveguides of increase coupled zone, thus splitting ratio and the wavelength relationship period of a function (cycle time 2 ~ 5 times such as, can be made) of optical branching device can be shortened.
In addition, in another one preferred embodiment of the present invention, when the optical branching device that the described splitting ratio multicycle is dynamically adjustable is parallel double waveguide optical splitter, can also manufacture described parallel double waveguide optical splitter time, by change coupled zone two waveguides in GeO 2doping content, total to make the Output optical power of single output terminal of optical branching device after improving and the ratio of Output optical power by the change of generating period with the change of the optical wavelength in used designated wavelength range.
Such as, preferably, in a particular embodiment of the present invention, the GeO at the middle part of two waveguides of described optical branching device coupled zone 2doping content than typical dopant concentrations reduce about 10 ~ 20mol%; Such as, about 15mol% can be reduced.As shown in Figure 7, the GeO at the two ends, coupled zone of optical branching device in figure 2doping content be typical dopant concentrations, and the GeO of coupled zone 2doping content reduced gradually to middle part by two ends, the GeO in the middle part of coupled zone 2doping content reduce about 15mol% than the typical dopant concentrations at coupled zone two ends.Now, the refractive index of SiO2 can be made to change (such as, change about 0.01 ~ 0.05), thus the eigenvalue V of waveguide is increased, increase mould field width degree, increase the Energy Coupling between two waveguides, thus the splitting ratio of optical branching device and wavelength relationship period of a function can be shortened (such as, when refractive index reduces 0.01 ~ 0.05, cycle time 2 ~ 5 times can be made), make the Output optical power of single output terminal of optical branching device after improving and the ratio of total Output optical power by the change of generating period with the change of the optical wavelength in used designated wavelength range.
In sum, in the inventive solutions, due to GeO in the duct width of the coupled zone to optical branching device, waveguide spacing and/or waveguide 2doping content etc. improve, total the change with the optical wavelength in used designated wavelength range is changed with the Output optical power of single output terminal and the ratio of Output optical power that make described optical branching device.Therefore, can, by using the mode of the light wave of the different wave length in designated wavelength range, make described optical branching device have different splitting ratios, thus the multicycle achieving the splitting ratio of optical branching device be dynamically adjustable.So, if use the optical branching device that the above-mentioned splitting ratio multicycle is dynamically adjustable in the actual deployment of PON, just in network design, operation maintenance and standby redundancy, only can adopt a kind of or a few physics splitting ratio optical branching device, thus greatly reduce the kind needing the optical branching device preparing or use, greatly reduce equipment cost and O&M cost.In addition, by the optical branching device using the above-mentioned splitting ratio multicycle dynamically adjustable, can according to factors such as the number of users under single PON mouth, user's transmission ranges, the suitably logic splitting ratio of configuration optical branching device, with matching network demand.In addition, when logic splitting ratio is less than physics splitting ratio, the reduction with logic splitting ratio linearly declines by its insertion loss, and no matter uses several output port in traditional optical branching device, and its insertion loss all cannot decline.Moreover, by the optical branching device using the above-mentioned splitting ratio multicycle dynamically adjustable, the luminous power of dynamic conditioning different branch can also be carried out by the change of splitting ratio, thus mate the link power budget of each branch road better, network design is become more flexibly with convenient.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (10)

1. an optical branching device, is characterized in that, this optical branching device at least comprises: input port, two output ports and the coupled zone be arranged between input port and output port;
Wherein, total the Output optical power of single output terminal of described optical branching device and the change of generating period with the change of the optical wavelength in used designated wavelength range of the ratio of Output optical power.
2. optical branching device according to claim 1, is characterized in that:
The waveguide spacing of described coupled zone is less than typical duct spacing.
3. optical branching device according to claim 1, is characterized in that:
In at least one waveguide of described coupled zone, the doping content of GeO2 is less than typical dopant concentrations.
4. optical branching device according to claim 3, is characterized in that:
In two waveguides of described coupled zone, the doping content of GeO2 reduces 10 ~ 20mol% than typical dopant concentrations.
5. optical branching device according to claim 1, is characterized in that:
Described designated wavelength range is 1260 ~ 1630nm.
6. optical branching device according to claim 1, is characterized in that:
Described optical branching device is fused tapered optical branching device or parallel double waveguide optical splitter.
7. optical branching device according to claim 6, is characterized in that:
When described optical branching device is parallel double waveguide optical splitter, the waveguide of described coupled zone is width gradual change type structure, and the duct width of described coupled zone is more than or equal to typical duct width.
8. optical branching device according to claim 7, is characterized in that:
The variable quantity of described duct width is 1 ~ 20 micron.
9. optical branching device according to claim 7, is characterized in that:
The width gradual change type structure of the waveguide of described coupled zone is arc width grading structure or linear extent grading structure.
10. optical branching device according to claim 6, is characterized in that:
When described optical branching device is parallel double waveguide optical splitter, the doping content of the GeO2 at the middle part of two waveguides of described optical branching device coupled zone reduces 10 ~ 20mol% than typical dopant concentrations.
CN201310684400.4A 2013-12-13 2013-12-13 Optical divider Active CN104714280B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310684400.4A CN104714280B (en) 2013-12-13 2013-12-13 Optical divider

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310684400.4A CN104714280B (en) 2013-12-13 2013-12-13 Optical divider

Publications (2)

Publication Number Publication Date
CN104714280A true CN104714280A (en) 2015-06-17
CN104714280B CN104714280B (en) 2017-02-22

Family

ID=53413760

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310684400.4A Active CN104714280B (en) 2013-12-13 2013-12-13 Optical divider

Country Status (1)

Country Link
CN (1) CN104714280B (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63216006A (en) * 1987-03-04 1988-09-08 Seiko Instr & Electronics Ltd Optical sensor
US4798436A (en) * 1985-07-30 1989-01-17 British Telecommunications, Plc Optical fused couplers
US5054874A (en) * 1990-12-17 1991-10-08 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Communications Coupler fabrication techniques for dissimilar fibers
US5095516A (en) * 1989-09-20 1992-03-10 Japan Aviation Electronics Industry Limited Wide-band optical fiber coupler and its manufacturing method
JPH06265751A (en) * 1993-03-15 1994-09-22 Shin Etsu Chem Co Ltd Manufacture of wide wavelength optical fiber coupler
JP2000298222A (en) * 1999-02-08 2000-10-24 Nippon Telegr & Teleph Corp <Ntt> Optical circuit element
US6148129A (en) * 1993-01-15 2000-11-14 E-Tek Dynamics, Inc. Broad bandwidth, single mode fiber optic coupler and method of manufacture
CN1373375A (en) * 2001-03-02 2002-10-09 Ntt前进技术株式会社 Optical-fibre coupler, its manufacture method and apparatus
US6768843B1 (en) * 2002-08-16 2004-07-27 Wavesplitter Technologies, Inc. Cascaded fourier filter interleaver having enhanced performance

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798436A (en) * 1985-07-30 1989-01-17 British Telecommunications, Plc Optical fused couplers
JPS63216006A (en) * 1987-03-04 1988-09-08 Seiko Instr & Electronics Ltd Optical sensor
US5095516A (en) * 1989-09-20 1992-03-10 Japan Aviation Electronics Industry Limited Wide-band optical fiber coupler and its manufacturing method
US5054874A (en) * 1990-12-17 1991-10-08 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Communications Coupler fabrication techniques for dissimilar fibers
US6148129A (en) * 1993-01-15 2000-11-14 E-Tek Dynamics, Inc. Broad bandwidth, single mode fiber optic coupler and method of manufacture
JPH06265751A (en) * 1993-03-15 1994-09-22 Shin Etsu Chem Co Ltd Manufacture of wide wavelength optical fiber coupler
JP2000298222A (en) * 1999-02-08 2000-10-24 Nippon Telegr & Teleph Corp <Ntt> Optical circuit element
CN1373375A (en) * 2001-03-02 2002-10-09 Ntt前进技术株式会社 Optical-fibre coupler, its manufacture method and apparatus
US6768843B1 (en) * 2002-08-16 2004-07-27 Wavesplitter Technologies, Inc. Cascaded fourier filter interleaver having enhanced performance

Also Published As

Publication number Publication date
CN104714280B (en) 2017-02-22

Similar Documents

Publication Publication Date Title
AU713241B2 (en) Interferometric switch
Bilodeau et al. High-return-loss narrowband all-fiber bandpass Bragg transmission filter
CN103345022B (en) Asymmetric planar optical waveguide mode multiplexing/demultiplexing device based on few-mode fibers
CN104297854B (en) Silicon substrate multi wave length illuminating source and its method for realization
CN110376753B (en) High-performance polarization beam splitter and design method thereof
CN103487889A (en) Mach-Zehnder optical switch structure based on coupling of double resonant cavities
WO2011137761A2 (en) Passive optical splitter and passive optical network system
CN112230328B (en) Ultrashort double-core photonic crystal fiber polarization beam splitter based on gold filling
CN104735554A (en) Passive optical network, device and method for adjusting logical splitting ratio of optical branching device
CN102096154A (en) Coupling device for double core optical fiber and manufacturing method thereof
CN104730645A (en) Multiplexer-demultiplexer for mode multiplexing-wavelength division multiplexing hybrid technology
CN102289032A (en) Terahertz photonic crystal fiber coupler
Cheng et al. Symmetrical directional coupler as a wavelength multiplexer-demultiplexer: theory and experiment
CN104714276A (en) Optical divider and optical coupling unit thereof
CN103698848B (en) A kind of optical fibre mode converter
CN104880768A (en) Tunable optical power divider
CN102298172A (en) Two-dimensional photonic crystal point defect-based tunable optical power distributor and working method
CN101997263B (en) Ultra-narrow line width ring cavity laser based on parallel feedback
CN116520493A (en) TE mode and TM mode separated polarization beam splitter chip based on film lithium niobate
CN104714280A (en) Optical divider
CN103091771B (en) Photonic crystal fiber directional coupler
NL8402232A (en) NETWORK WITH NUMBER OF ACCESSES.
KR20140063143A (en) An optical splitter having good polarization characteristic and wavelength uniformity
Shin et al. All fiber wavelength and mode selective coupler for optical inter-connections
Serecunova et al. Comparison of optical properties of 1x128 splitters based on Y-branch and MMI approaches

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant