CN203606531U - Filter system - Google Patents
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- CN203606531U CN203606531U CN201320723444.9U CN201320723444U CN203606531U CN 203606531 U CN203606531 U CN 203606531U CN 201320723444 U CN201320723444 U CN 201320723444U CN 203606531 U CN203606531 U CN 203606531U
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Abstract
The utility model provides a filter system comprising a comb filter, a first single-wave filter, a second single-wave filter, a third single-wave filter and a fourth single-wave filter; wherein the comb filter comprises a reflection terminal and a straight-through terminal; the first single-wave filter is arranged at the reflection optical path of the comb filter, the third single-wave filter is arranged at the reflection optical path of the first single-wave filter, the second single-wave filter is arranged at the emitting optical path of the comb filter, and the fourth single-wave filter is arranged at the reflection optical path of the second single-wave filter. By employing the filter system provided by the utility model, the isolation level of signals is increased.
Description
Technical field
The utility model embodiment relates to the communication technology, relates in particular to a kind of filter system.
Background technology
The stacking multiplexing passive optical networking of 40G time-division wavelength-division network (time and wavelength division multiplexed passive optical network, be called for short TWDM-PON) be defined as the standard framework of next-generation passive optical network by FSAN (Full Service Access Network is called for short FSAN) normal structure.
Fig. 1 is the canonical schema of the optical line terminal of 40G TWDM-PON.Optical line terminal (optical line terminal, be called for short OLT) on the one hand the signal that is carried on miscellaneous service is converged at local side, send into access network to terminal user's transmission, self terminal user's signal is sent into respectively in miscellaneous service net according to type of service in the future on the other hand according to certain signal format.As shown in Figure 1,40GTWDM-PON utilizes 4 pairs of different up-downgoing wavelength, and original 10G-PON dilatation is become to original four times.In specific implementation process, miscellaneous service signal is by 10G semiconductor laser (Laser Diode, be called for short LD) be converted to light signal by electric signal, then each light signal converges to multiplexer (Multiplexer, be called for short MUX), then through the stacking multiplexer process of time-division wavelength-division Optical Fiber Transmission, realized the process of signal transmission.In reception signal process, time-division wavelength division multiplexer receives the light signal of Optical Fiber Transmission, is then transferred to demultiplexer (demultiplexer, be called for short DeMux), be transferred to 2.5G photodiode (Photo-Diode is called for short PD) by DeMux, by PD, light signal be converted to electric signal.
It is wider for 40G TWDM-PON can be applied, researchist wishes that 40G TWDM-PON is in reception signal process, can compatible gigabit than EPON (Gigabit-Capable Passive Optical Networks GPON, be called for short GPON) the luminous power dynamic range of-20dB, simultaneously, the signal to noise ratio (S/N ratio) of also produced in transmitting procedure-15dB, therefore, if 40G TWDM-PON can compatible 20GGPON, OLT is receiving after signal, and filter system need to produce the isolation of be less than-35dB.And being limited to the technological level of array waveguide grating and single wave filter, prior art cannot meet the requirement of isolation.
Utility model content
The utility model embodiment provides a kind of filter system, to improve the isolation between signal.
First aspect, the utility model provides a kind of filter system, comprising: comb filter, first single wave filter, second single wave filter, the 3rd single wave filter and the 4th single wave filter; Wherein,
Described comb filter comprises reflection end and straight-through end;
Described first single wave filter is positioned on the reflected light path of described comb filter, and described the 3rd single wave filter is positioned on the reflected light path of described first single wave filter;
Described second single wave filter is positioned on the emitting light path of described comb filter, and described the 4th single wave filter is positioned on the reflected light path of described second single wave filter.
In conjunction with first aspect, in the possible implementation of the first of first aspect, also comprise: the first photodiode, the second photodiode, the 3rd photoelectric diode and the 4th photodiode;
Described the first photodiode is positioned on the transmitted light path of described first single wave filter, described the second photodiode is positioned on the transmitted light path of described second single wave filter, described the 3rd photodiode is positioned on the transmitted light path of described the 3rd single wave filter, and described the 4th photodiode is positioned on the transmitted light path of described the 4th single wave filter.
In conjunction with first aspect, in the possible implementation of the second of first aspect, also comprise:
The first catoptron, the second catoptron, the 3rd catoptron and the 4th catoptron, the 5th photodiode, the 6th photodiode, the 7th photodiode and the 8th photodiode;
Described the first catoptron is positioned on the transmitted light path of described first single wave filter, and described the 5th photoelectric diode is positioned on the reflected light path of described the first catoptron;
Described the second catoptron is positioned on the transmitted light path of described second single wave filter, and described the 6th photoelectric diode is positioned on the reflected light path of described the second catoptron;
Described the 3rd catoptron is positioned on the transmitted light path of described the 3rd single wave filter, and described the 7th photoelectric diode is positioned on the reflected light path of described the 3rd catoptron;
Described the 4th catoptron is positioned on the transmitted light path of described the 4th single wave filter, and described the 8th photoelectric diode is positioned on the reflected light path of described the 4th catoptron;
Described the 5th photodiode, the 6th photodiode, the 7th photoelectric diode and the 8th photodiode array are arranged.
In conjunction with first aspect, in the third possible implementation of first aspect, also comprise: the 5th catoptron and the 6th catoptron, the 9th photodiode, the tenth photodiode, the 11 photoelectric diode and the 12 photodiode;
Described comb filter, described first single wave filter, described the 3rd single wave filter form the first arrayed;
Described the 5th catoptron is along the direction setting that is parallel to described the first arrayed;
Described second single wave filter, described the 4th single wave filter form the second arrayed;
Described the 6th catoptron is along the direction setting that is parallel to described the second arrayed;
Described the 9th photodiode is positioned on the transmitted light path of described first single wave filter, described the tenth photoelectric diode is positioned on the transmitted light path of described second single wave filter, described the 11 photodiode is positioned on the transmitted light path of described the 3rd single wave filter, and described the 12 photodiode is positioned on the transmitted light path of described the 4th single wave filter.
In conjunction with the first of first aspect, first aspect to the third any possible implementation, in the 4th kind of possible implementation of first aspect, described first single wave filter see through wavelength be the first wavelength, described second single wave filter see through wavelength be second wave length, described the 3rd single wave filter see through wavelength be three-wavelength, described the 4th single wave filter see through wavelength be the 4th wavelength; Described the first wavelength, described second wave length, described three-wavelength, described the 4th wavelength become arithmetic progression, and what the tolerance of described arithmetic progression was described comb filter sees through wavelength.
In conjunction with the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation of first aspect, described comb filter is ether dragon wave filter.
In conjunction with the 4th kind of possible implementation of first aspect, in the 6th kind of possible implementation of first aspect, described first single wave filter is the first film filter plate, described second single wave filter is the second film filtering slice, described the 3rd single wave filter is the 3rd film filtering slice, and described the 4th single wave filter is the 4th film filtering slice.
The filter system that the utility model provides, comprising: comb filter, first single wave filter, second single wave filter, the 3rd single wave filter and the 4th single wave filter; Wherein, described comb filter comprises reflection end and straight-through end; Described first single wave filter is positioned on the reflected light path of described comb filter, and described the 3rd single wave filter is positioned on the reflected light path of described first single wave filter; Described second single wave filter is positioned on the emitting light path of described comb filter, and described the 4th single wave filter is positioned on the reflected light path of described second single wave filter.This filter system can improve the isolation between signal, thereby reduces crosstalking between signal, reduces the bit error rate of receiver to signal decoding, makes to use the 40G TWDM-PON of this filter system can compatible 20G GPON.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the canonical schema of the optical line terminal of 40G TWDM-PON;
Fig. 2 is the structural representation of the utility model filter system embodiment mono-;
Fig. 3 is the structural representation of the utility model filter system embodiment bis-;
Fig. 4 is the structural representation of the utility model filter system embodiment tri-;
Fig. 5 is the structural representation of the utility model filter system embodiment tetra-.
Embodiment
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 2 is the structural representation of the utility model filter system embodiment mono-, as shown in Figure 2, the filter system of the present embodiment comprises: the single wave filter 102 of comb filter 101, the first, the second single wave filter 103 of single wave filter 104, the three and the 4th single wave filter 105.
Wherein, described comb filter 101 comprises reflection end and straight-through end (not shown);
Described first single wave filter 102 is positioned on the reflected light path of described comb filter, and described the 3rd single wave filter is positioned on the reflected light path of described first single wave filter 102;
Described second single wave filter 104 is positioned on the emitting light path of described comb filter 101, and described the 4th single wave filter 105 is positioned on the reflected light path of described second single wave filter 104.
Alternatively, comb filter 101, by many passband and stopbands of pressing certain frequency interval aligned identical, only allows the signal of some particular frequency range pass through.Described first single wave filter 102 see through wavelength be the first wavelength X 0, described second single wave filter 104 see through wavelength be second wave length λ 0+ Δ λ, described the 3rd single wave filter 103 see through wavelength be wavelength lambda 0+2 Δ λ, described the 4th single wave filter 105 see through wavelength be the 4th wavelength X 0+3 Δ λ; Described the first wavelength X 0, described second wave length λ 0+ Δ λ, described wavelength lambda 0+2 Δ λ, described the 4th wavelength become arithmetic progression λ 0+3 Δ λ, and the tolerance Δ λ of described arithmetic progression is the wavelength that sees through of described comb filter 101.
In specific implementation process, when the filter system of the present embodiment can be applied to the DeMux part in 40GTWDM-PON, when filter system receives input Si road signal, Gai Si road wavelength corresponding to signal is respectively the first wavelength X 0, second wave length λ 0+ Δ λ, wavelength lambda 0+2 Δ λ, the 4th wavelength X 0+3 Δ λ.First Gai Si road signal sees through wavelength through one is the comb filter 101 of Δ λ, Gai Si road signal is through after comb filter 101, the signal of the first wavelength X 0 and wavelength lambda 0+2 Δ λ is in the reflection end outgoing of comb filter 101, generation-10dB isolation simultaneously and between other signal; The signal of second wave length λ 0+ Δ λ and wavelength lambda 0+3 Δ λ is penetrated straight-through the bringing out of comb filter 101, and generation-15dB isolation between other signal.
It is the signal of the first wavelength X 0 and wavelength lambda 0+2 Δ λ at the wavelength of comb filter 101 reflection end outgoing, first single wave filter 102 leaches the signal that wavelength is the first wavelength X 0, and making wavelength is signal and increase again-25dB of other signal isolation of the first wavelength X 0.After device system, wavelength is obtain altogether-35dB of the signal of the first wavelength X 0 isolation after filtering.The single wave filter 103 of signal to the three that first single wave filter 102 reflection wavelengths are wavelength lambda 0+2 Δ λ, the 3rd single wave filter 103 leaches the signal that wavelength is wavelength lambda 0+2 Δ λ, and making wavelength is signal and increase again-25dB of other signal isolation of wavelength lambda 0+2 Δ λ.After device system, wavelength is obtain altogether-35dB of the signal isolation of wavelength lambda 0+2 Δ λ after filtering.
Lead directly to and bring out the signal that the wavelength of penetrating is second wave length λ 0+ Δ λ and the 4th wavelength X 0+3 Δ λ in comb filter 101, second single wave filter 104 leaches the signal that wavelength is second wave length λ 0+ Δ λ, and making wavelength is signal and other signal increase-25dB isolation of second wave length λ 0+ Δ λ.After device system, wavelength is obtain altogether-40dB of the signal isolation of second wave length λ 0+ Δ λ after filtering.Second single wave filter 104 reflects the single wave filter 105 of signal to the four of λ 0+3 Δ λ, the 4th single wave filter 105 leaches the signal that wavelength is the 4th wavelength X 0+3 Δ λ, and making wavelength is signal and increase again-25dB of other signal isolation of the 4th wavelength X 0+3 Δ λ.After device system, wavelength is obtain altogether-40dB of the signal isolation of the 4th wavelength X 0+3 Δ λ after filtering.
It will be understood by those skilled in the art that single wave filter related in the present embodiment is the wave filter that can filter single ripple, for the specific implementation form of single wave filter, the present embodiment is not particularly limited herein.
To sum up, wavelength is signal acquisition-35dB isolation of the first wavelength X 0, wavelength is signal acquisition-40dB isolation of second wave length λ 0+ Δ λ, and wavelength is signal acquisition-35dB isolation of wavelength lambda 0+2 Δ λ, and wavelength is signal acquisition-40dB isolation of the 4th wavelength X 0+3 Δ λ.
The filter system that the utility model provides, comprising: comb filter, first single wave filter, second single wave filter, the 3rd single wave filter and the 4th single wave filter; Wherein, described comb filter comprises reflection end and straight-through end; Described first single wave filter is positioned on the reflected light path of described comb filter, and described the 3rd single wave filter is positioned on the reflected light path of described first single wave filter; Described second single wave filter is positioned on the emitting light path of described comb filter, and described the 4th single wave filter is positioned on the reflected light path of described second single wave filter.This filter system can improve the isolation between signal, thereby reduces crosstalking between signal, reduces the bit error rate of receiver to signal decoding, makes to use the 40G TWDM-PON of this filter system can compatible 20G GPON.
Fig. 3 is the structural representation of the utility model filter system embodiment bis-, and as shown in Figure 3, the filter system of the present embodiment is on the basis of Fig. 2 embodiment, also comprise: the first photodiode (Photo-Diode, be called for short PD) 106, the two PD109, the 3rd PD107 and the 4th PD108.
Wherein, a described PD106 is positioned on the transmitted light path of described first single wave filter 102, described the 2nd PD109 is positioned on the transmitted light path of described second single wave filter 104, described the 3rd PD107 is positioned on the transmitted light path of described the 3rd single wave filter 103, and described the 4th PD108 is positioned on the transmitted light path of described the 4th single wave filter 105.
PD is the optoelectronic sensor that light signal is converted to electric signal, and four road signals transfer in corresponding PD, convert light signal to electric signal by PD, then carries out follow-up processing procedure.Because this filter system can improve the isolation between signal, reduce crosstalking between signal, therefore in follow-up processing procedure, can reduce the bit error rate of receiver to signal decoding, make to use the 40GTWDM-PON of this filter system can compatible 20G GPON.
Fig. 4 is the structural representation of the utility model filter system embodiment tri-, and as shown in Figure 4, the filter system of the present embodiment, on the basis of Fig. 2 embodiment, also comprises:
The first catoptron 114, the second catoptron 117, the three catoptrons 115 and the 4th catoptron 116, the five PD110, the 6th PD113, the 7th PD111 and the 8th PD112;
Described the first catoptron 114 is positioned on the transmitted light path of described first single wave filter 102, and described the 5th PD110 is positioned on the reflected light path of described the first catoptron 114;
Described the second catoptron 117 is positioned on the transmitted light path of described second single wave filter 104, and described the 6th PD113 is positioned on the reflected light path of described the second catoptron 117;
Described the 3rd catoptron 115 is positioned on the transmitted light path of described the 3rd single wave filter 103, and described the 7th PD111 is positioned on the reflected light path of described the 3rd catoptron 115;
Described the 4th catoptron 116 is positioned on the transmitted light path of described the 4th single wave filter 105, and described the 8th PD112 is positioned on the reflected light path of described the 4th catoptron 116;
Described the 5th PD110, the 6th PD113, the 7th PD111 and the 8th PD112 arrayed.
The principle of work of the present embodiment and Fig. 2 embodiment's is similar, and the present embodiment repeats no more herein.The present embodiment is on the basis of Fig. 2 embodiment, by the first catoptron 114, the second catoptron 117, the 3rd catoptron 115 and the 4th catoptron 116, make the 5th PD110, the 6th PD113, the 7th PD111 and the 8th PD112 can arrayed, can use less number of devices, thereby reduce the assembly difficulty of high isolation filter system
Fig. 5 is the structural representation of the utility model filter system embodiment tetra-, and as shown in Figure 5, the filter system of the present embodiment is on the basis of Fig. 2 embodiment, also comprise: the 5th catoptron 118 and the 6th catoptron 119, the 9th PD114, the tenth PD116, the 11 PD115 and the 12 PD117.
Wherein, described comb filter 101, described first single wave filter 102, described the 3rd single wave filter 103 form the first arrayed;
Described the 5th catoptron 118 is along the direction setting that is parallel to described the first arrayed;
Described second single wave filter 104, described the 4th single wave filter 105 form the second arrayed;
Described the 6th catoptron 119 is along the direction setting that is parallel to described the second arrayed;
Described the 9th PD114 is positioned at the transmitted light path of described first single wave filter 102, described the tenth PD116 is positioned at the transmitted light path of described second single wave filter 104, described the 11 PD115 is positioned at the transmitted light path of described the 3rd single wave filter 103, and described the 12 PD117 is positioned at the transmitted light path of described the 4th single wave filter 105.
The principle of work of the present embodiment and Fig. 2 embodiment are similar, and the present embodiment repeats no more herein.The present embodiment shortens light path by increasing the 5th catoptron and the 6th catoptron, shortening on the basis of light path, can make comb filter, described first single wave filter, described the 3rd single wave filter form the first arrayed, described second single wave filter, described the 4th single wave filter form the second arrayed, thereby reduce encapsulation difficulty, and reduced the size of filter system.
Alternatively, comb filter in the various embodiments described above can be ether dragon wave filter (etalon), described first single wave filter is the first film filter plate, described second single wave filter is the second film filtering slice, described the 3rd single wave filter is the 3rd film filtering slice, and described the 4th single wave filter is the 4th film filtering slice.The present embodiment, by selecting the less ether of Insertion Loss dragon wave filter and film filtering slice as wave filter, has reduced the Insertion Loss of high isolation filter system.
Finally it should be noted that: above each embodiment, only in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of the each embodiment technical scheme of the utility model.
Claims (7)
1. a filter system, is characterized in that, comprising: comb filter, first single wave filter, second single wave filter, the 3rd single wave filter and the 4th single wave filter; Wherein,
Described comb filter comprises reflection end and straight-through end;
Described first single wave filter is positioned on the reflected light path of described comb filter, and described the 3rd single wave filter is positioned on the reflected light path of described first single wave filter;
Described second single wave filter is positioned on the emitting light path of described comb filter, and described the 4th single wave filter is positioned on the reflected light path of described second single wave filter.
2. system according to claim 1, is characterized in that, also comprises: the first photodiode, the second photodiode, the 3rd photoelectric diode and the 4th photodiode;
Described the first photodiode is positioned on the transmitted light path of described first single wave filter, described the second photodiode is positioned on the transmitted light path of described second single wave filter, described the 3rd photodiode is positioned on the transmitted light path of described the 3rd single wave filter, and described the 4th photodiode is positioned on the transmitted light path of described the 4th single wave filter.
3. system according to claim 1, is characterized in that, also comprises:
The first catoptron, the second catoptron, the 3rd catoptron and the 4th catoptron, the 5th photodiode, the 6th photodiode, the 7th photodiode and the 8th photodiode;
Described the first catoptron is positioned on the transmitted light path of described first single wave filter, and described the 5th photoelectric diode is positioned on the reflected light path of described the first catoptron;
Described the second catoptron is positioned on the transmitted light path of described second single wave filter, and described the 6th photoelectric diode is positioned on the reflected light path of described the second catoptron;
Described the 3rd catoptron is positioned on the transmitted light path of described the 3rd single wave filter, and described the 7th photoelectric diode is positioned on the reflected light path of described the 3rd catoptron;
Described the 4th catoptron is positioned on the transmitted light path of described the 4th single wave filter, and described the 8th photoelectric diode is positioned on the reflected light path of described the 4th catoptron;
Described the 5th photodiode, the 6th photodiode, the 7th photoelectric diode and the 8th photodiode array are arranged.
4. system according to claim 1, is characterized in that, also comprises: the 5th catoptron and the 6th catoptron, the 9th photodiode, the tenth photodiode, the 11 photoelectric diode and the 12 photodiode;
Described comb filter, described first single wave filter, described the 3rd single wave filter form the first arrayed;
Described the 5th catoptron is along the direction setting that is parallel to described the first arrayed;
Described second single wave filter, described the 4th single wave filter form the second arrayed;
Described the 6th catoptron is along the direction setting that is parallel to described the second arrayed;
Described the 9th photodiode is positioned on the transmitted light path of described first single wave filter, described the tenth photoelectric diode is positioned on the transmitted light path of described second single wave filter, described the 11 photodiode is positioned on the transmitted light path of described the 3rd single wave filter, and described the 12 photodiode is positioned on the transmitted light path of described the 4th single wave filter.
5. according to the system described in claim 1 to 4 any one, it is characterized in that, described first single wave filter see through wavelength be the first wavelength, described second single wave filter see through wavelength be second wave length, described the 3rd single wave filter see through wavelength be three-wavelength, described the 4th single wave filter see through wavelength be the 4th wavelength; Described the first wavelength, described second wave length, described three-wavelength, described the 4th wavelength become arithmetic progression, and what the tolerance of described arithmetic progression was described comb filter sees through wavelength.
6. system according to claim 5, is characterized in that, described comb filter is ether dragon wave filter.
7. system according to claim 5, it is characterized in that, described first single wave filter is the first film filter plate, and described second single wave filter is the second film filtering slice, described the 3rd single wave filter is the 3rd film filtering slice, and described the 4th single wave filter is the 4th film filtering slice.
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| CN201320723444.9U CN203606531U (en) | 2013-11-13 | 2013-11-13 | Filter system |
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| CN201320723444.9U CN203606531U (en) | 2013-11-13 | 2013-11-13 | Filter system |
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