CN101459473A - Optical beam splitter, optical beam combiner and point-to-multipoint network system - Google Patents
Optical beam splitter, optical beam combiner and point-to-multipoint network system Download PDFInfo
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- CN101459473A CN101459473A CNA2007101995750A CN200710199575A CN101459473A CN 101459473 A CN101459473 A CN 101459473A CN A2007101995750 A CNA2007101995750 A CN A2007101995750A CN 200710199575 A CN200710199575 A CN 200710199575A CN 101459473 A CN101459473 A CN 101459473A
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Abstract
The invention discloses a light splitter, a light combiner and a point-to-multipoint optical network, wherein the light splitter has at least two input ends, and a first light splitting element comprises two inputs and N1 outputs, one output of the first light splitting element is coupled with the first input end of the light splitter, and the outputs of the first light splitting element are coupled on the N1 output ends of the light splitter, thereof, the input light from each input of the first light splitting element is divided into N1 paths of output lights, wherein N1 is an integer larger than or equal to 2. A second light splitting element comprises at least one input and N2 outputs, wherein the input of the second light splitting element is coupled with the second input end of the light splitter for dividing the input light from each input of the first light splitting element into N2 paths of output lights, wherein N2 is an integer larger than or equal to 2, and at least one output of the second light splitting element is coupled on the other input of the first light splitting element. The light splitter provided by the invention can be used to make the allocation and the application of a system more flexible, and is convenient for expanding.
Description
Technical field
The present invention relates to the point-to-multi-point optical network technical field, particularly a kind of optical splitter, splicer and point-to-multi-point optical network system.
Background technology
EPON (Passive Optical Network, PON) system configuration can be as shown in Figure 1, comprise optical line terminal (Optical Line Terminal, OLT), light distributed network (Optical DistributionNetwork, ODN), optical network unit (Optical Network Unit, ONU)/and Optical Network Terminal (OpticalNetwork Termination, ONT).OLT is installed on central machine room, can accessing public switched telephone network (Public Switched Telephone Network, PSTN), the Internet (Internet), community antenna television (CATV) (Community Antenna TV CATV) system etc.ONU is installed on the subscriber equipment end or combines together with it, is used to provide the user to insert.Light distributed network ODN mainly is made up of optical branching device passive devices such as (Splitter), optical branching device (Splitter) is connected with optical line terminal OLT by trunk optical fiber, and by branch optical fiber and a plurality of optical network unit (Optical Network Unit, ONU)/Optical Network Terminal (Optical Network Termination, ONT) connect, realize point-to-multipoint delivery, promptly an optical fiber of PON local side (OLT) is connected to and is divided into behind the optical splitter tens of even the ONU of multiple branches fiber-to-the-subscriber end more.General descending employing time division multiplexing (the Time DivisionMultiplex of PON system, TDM), up employing time-division multiplexing multiple access (Time Division Multiplex Access, TDMA) technology Data transmission between OLT and ONU/ONT, promptly a plurality of ONU/ONT share the uplink and downlink bandwidth of a PON network.
At present representative PON technology be gigabit PON (Gigabit Passive OpticalNetwork, GPON) and Ethernet EPON (Ethernet Passive Optical Network, EPON).General employing splitting ratio was the optical splitter (N is 16,32 or 64) of 1:N or 2:N when EPON, GPON disposed.The uplink and downlink bandwidth of EPON is respectively 1Gbps, and the uplink and downlink bandwidth of GPON is respectively 1Gbps and 2Gbps.
Fig. 1 shows the structure chart that splitting ratio is the optical splitter of 1 * N, and wherein N can be 4,8,16,32 or 64, is 8 among the figure.As shown in Figure 1, an end of optical splitter 11 has only an input port, can be used for connecting OLT1 by trunk optical fiber in the PON network.The other end of optical splitter 11 has 8 ports, and each port can connect an ONU/ONT by a branch optical fiber.
Owing to share a PON network up and down bandwidth, number of users determines that user's average bandwidth determines that if number of users increases, user's average bandwidth reduces.Increase user's average bandwidth if desired, need to reduce the number of users of sharing this PON network.
Be illustrated in figure 2 as the beam split result schematic diagram that increases under the optical splitter situation.Among Fig. 2, the output of 1 * 8 optical splitter 11 originally only inserts 4 ONU/ONT, other 4 output free time; Introduce another optical splitter of 1 * 4 12, other 4 ONU/ONT are linked into the output of optical splitter 12.
Be illustrated in figure 3 as with two 1 * 4 optical splitter 13,14 and replace among Fig. 1 the output that 11,8 ONU/ONT of optical splitter of 1 * 8 insert optical splitter 13,14 respectively.
The inventor finds in implementing process of the present invention, existing optical splitter is generally an input, and the branches of optical splitter is fixed, and promptly splitting ratio is fixed, need increase or replace device when system extension, limitation is bigger, dumb when using in other application scenario; In addition, optical splitter is generally passive device, and useful life is long, can reach tens two ten years usually, and frequent replacing can cause the significant wastage of cost.
Summary of the invention
The purpose of the embodiment of the invention provides optical splitter, splicer and point-to-multi-point optical network system, fixes the defective of autgmentability difference to overcome in the prior art optical splitter splitting ratio.
For solving the problems of the technologies described above, the embodiment of the invention provides optical splitter, splicer and point-to-multi-point optical network system to be achieved in that
A kind of optical splitter has at least two inputs,
First beam splitter, has 2 inputs and N1 output, the output that an input of described first beam splitter is couple to the first input end of described optical splitter and described first beam splitter is couple to N1 output of described optical splitter, to be divided into output light in N1 road from the input light of each input of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second beam splitter, have at least 1 input and N2 output, the input of described second beam splitter is couple to second input of described optical splitter, will be divided into output light in N2 road from the input light of each input of described first beam splitter, wherein, N2 is the integer more than or equal to 2;
At least one output of described second beam splitter is couple to another input of described first beam splitter.
A kind of splicer provided by the invention has at least two outputs,
First closes optical element, have 2 outputs and N1 input, N1 the input that an output of described first beam splitter is couple to first output of described splicer and described first beam splitter is couple to N1 input of described splicer respectively, will be from N1 the input light compositing of importing 1 tunnel output light of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second closes optical element, have at least 1 output and N2 input, described second output of closing optical element is couple to second output of described splicer, will close input light compositing 1 tunnel input light of N2 input of optical element from described first, wherein, N2 is the integer more than or equal to 2;
Described second at least one input of closing optical element is couple to described first another output of closing optical element.
A kind of point-to-multi-point optical network system that the embodiment of the invention provides comprises: optical line terminal OLT, optical splitter and a plurality of Optical Network Terminal ONU/ONT;
Described optical line terminal OLT is couple to an input of described optical splitter by trunk optical fiber;
Described each Optical Network Terminal ONU/ONT is couple to an output of described optical splitter by branch optical fiber;
Described optical splitter has at least two inputs, and described optical splitter also comprises:
First beam splitter, has 2 inputs and N1 output, the output that an input of described first beam splitter is couple to first input end and described first beam splitter is couple to N1 output of optical splitter, to be divided into output light in N1 road from the input light of each input of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second beam splitter, has at least 1 input and N2 output, the input of described second beam splitter is couple to second input, to be divided into N2 road output light from the second input light of coming in and going out end, at least one road output of described second beam splitter is couple to another input of described first beam splitter, wherein, N2 is the integer more than or equal to 2.
The optical splitter of the multiple-input and multiple-output that the embodiment of the invention provides can provide at least two kinds of inputs, and light is from the input of each input, its output the number difference, this optical splitter makes system configuration and use more flexibly, is convenient to expansion.
Description of drawings
Fig. 1 is for having the PON system construction drawing of the optical splitter of 1 * N in the prior art;
Fig. 2 is the PON system schematic that increases in the prior art under the optical splitter situation;
Fig. 3 is for replacing the PON system schematic of former optical splitter with two little optical splitters of splitting ratio in the prior art;
Fig. 4 is the schematic diagram of first embodiment of PON system of the present invention 3 * N optical splitter;
Fig. 5 is the schematic diagram of second embodiment of PON system of the present invention 3 * N optical splitter;
Fig. 6 is the schematic diagram of first embodiment of PON system of the present invention 4 * N optical splitter;
Fig. 7 is the schematic diagram of second embodiment of PON system of the present invention 4 * N optical splitter;
Fig. 8 is the present invention's PON system embodiment schematic diagram that automaticallyes switch.
Embodiment
In order to make those skilled in the art person understand the present invention program better, the embodiment of the invention is described in further detail below in conjunction with drawings and embodiments.
The embodiment of the invention provides a kind of optical splitter, and this optical splitter has at least two inputs and a plurality of output, and this optical splitter also comprises:
First beam splitter, has 2 inputs and N1 output, the output that an input of described first beam splitter is couple to first input end and described first beam splitter is couple to N1 output of optical splitter, to be divided into output light in N1 road from the input light of each input of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second beam splitter, has at least 1 input and N2 output, the input of described second beam splitter is couple to second input, to be divided into N2 road output light from the second input light of coming in and going out end, at least one road output of described second beam splitter is couple to another input of described first beam splitter, wherein, N2 is the integer more than or equal to 2.
The optical splitter that the embodiment of the invention provides can provide a plurality of inputs, can be as required when the networking for the operator of EPON, need or share the needs of number of users of same trunk optical fiber or the needs of user's luminous power are selected corresponding input as bandwidth.
Wherein, optical splitter can be fused biconical taper form (promptly adopting the fused biconical taper manufacturing to form), also can be slab guide form (adopting slab guide technology or semiconductor technology to make).Here, in order to reduce the complexity of design and processing technology, thereby reduce cost, we adopt one 2 * 2 a plurality of 1 * 2 optical branching devices of optical branching device (X type optical branching device) cascade (Y type optical branching device) to form first beam splitter of 2 * N1, promptly have N1 first beam splitter of exporting of 2 inputs; Wherein, described N1 is 2
n, n is a natural number, is 4,8,16,32 etc. as N1.As shown in Figure 4, N1 is 21 * 2 optical branching device parallel connections of 12 * 2 optical branching device cascade of 4 needs.If N1 is 8 then exports one 1 * 2 optical branch of cascade again at the output 42out1 of Fig. 4 and each of 42out2 correspondence.
Wherein, described optical splitter can comprise described first beam splitter of even number, described second beam splitter; Wherein, the number of described N2 is more than or equal to the number of described first beam splitter, so that an input of each first optical splitter can be couple to an output of second beam splitter.Wherein, the number of first beam splitter is got even number can be so that the symmetrical configuration of optical splitter, and the input and output symmetry reduces crosstalking between branch.
It should be noted that, optical splitter is also as splicer, be that above-mentioned optical splitter is in work, the input of optical splitter and output, the input and output of first beam splitter, second beam splitter can be exchanged, promptly from the input light of the multi-channel output of optical splitter input, through first beam splitter or/and behind second beam splitter synthetic one road light from the corresponding input output of optical splitter.The principle of splicer is the same with optical splitter, and promptly a kind of splicer basic comprising of providing of the embodiment of the invention is, splicer has at least two outputs,
First closes optical element, have 2 outputs and N1 input, N1 the input that an output of described first beam splitter is couple to first output of described splicer and described first beam splitter is couple to N1 input of described splicer respectively, will be from N1 the input light compositing of importing 1 tunnel output light of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second closes optical element, have at least 1 output and N2 input, described second output of closing optical element is couple to second output of described splicer, will close input light compositing 1 tunnel input light of N2 input of optical element from described first, wherein, N2 is the integer more than or equal to 2;
Described second at least one input of closing optical element is couple to described first another output of closing optical element.
The embodiment of the invention also provides a kind of point-to-multi-point optical network system, and this system comprises: optical line terminal OLT, optical splitter and a plurality of (at least one) Optical Network Terminal ONU/ONT;
Described optical line terminal OLT is couple to an input of described optical splitter by trunk optical fiber;
Described each Optical Network Terminal ONU/ONT is couple to an output of described optical splitter by branch optical fiber;
Wherein, described optical splitter has at least two inputs, and described optical splitter also comprises:
First beam splitter, has 2 inputs and N1 output, the output that an input of described first beam splitter is couple to first input end and described first beam splitter is couple to N1 output of optical splitter, to be divided into output light in N1 road from the input light of each input of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second beam splitter, has at least 1 input and N2 output, the input of described second beam splitter is couple to second input, to be divided into N2 road output light from the second input light of coming in and going out end, at least one road output of described second beam splitter is couple to another input of described first beam splitter, wherein, N2 is the integer more than or equal to 2.
Wherein, described point-to-multi-point optical network system, further comprise: first switch unit is or/and second switch unit; Wherein, described first switch unit and described second switch unit can be arranged at one;
First switch unit switches to another input with described OLT from an input of optical splitter.Wherein, first switch unit can receive one and switch indication, switch according to switching indication, this switching indication can be that bandwidth is selected indication, switch unit receives this indication, switches to another input with connecting the input port of OLT from optical splitter, is connected to second input as OLT by trunk optical fiber, when needing the upgrading bandwidth, diverter switch switches to first input end with trunk optical fiber.Wherein, select to switch the situation of the input of a plurality of optical splitters, preferably first switch unit is arranged between trunk optical fiber and the optical splitter, can save optical fiber, can be used for bandwidth and select for OLT.
Second switch unit switches to an OLT with an input port of optical splitter from an OLT.This second switch unit can receive one and switch indication, switches according to the switching indication that receives.Select to switch the situation of a plurality of OLT for the input port of an optical splitter, this second switch unit can be arranged between trunk optical fiber and the optical splitter, also can be arranged between OLT and the trunk optical fiber, wherein, if the physical location of a plurality of OLT is contiguous, preferably second switch unit is arranged between trunk optical fiber and the OLT; Further, if to be logic independent but one physically for a plurality of OLT, this second switch unit can also be arranged on the OLT.
Wherein, described first switch unit and described second switch unit can also be arranged in the optical splitter, as adopting micro photo-electro-mechanical (Micro-opto-electromechanical systems, MOEMS) integrated equipment of the array of photoswitch of technology and slab guide.
Wherein, switching indication can be that webmaster or strategic decision-making service equipment are indicated by the switching that OLT assigns, and also can be the indication that OLT directly makes a strategic decision and assigns.For example, need be with one group of Optical Network Terminal ONU/ONT upgrading bandwidth, webmaster is assigned by OLT and is switched indication, switches the input of the optical splitter of this group Optical Network Terminal ONU/ONT correspondence.
Wherein, described point-to-multi-point optical network system further comprises: the 3rd switch unit switches to another output with described Optical Network Terminal ONU/ONT from an output port of described optical splitter.
Referring to the schematic diagram of Fig. 4 for first embodiment of PON system of the present invention 3 * N optical splitter.Optical splitter comprises 2 first beam splitters and 1 second beam splitter, and wherein: first beam splitter is made of beam splitter 42 (or 43) and two 1 * 2 beam splitter cascades of 2 * 2; Second beam splitter is made of 1 * 2 beam splitter 41, and the signal transmission can not given unnecessary details at this referring to shown in Figure 4.
When needs promoted the bandwidth of each user in the PON network by reducing splitting ratio, for the ODN that can farthest utilize cloth to put well, as shown in Figure 5, Fig. 5 was the schematic diagram of second embodiment of PON system of the present invention 3 * N optical splitter.
PON system according to Fig. 4 and Fig. 5.In Fig. 4, suppose that the OLT bandwidth that trunk optical fiber 1 is connected is 800M, ONU that then each branch optical fiber connected can mean allocation to bandwidth be 100M.It should be noted that 22 * 2 optical splitter 42 at this moment and 43 promptly has only 42 owing to have only 1 first side ports input separately
In1With 43
In1Input, in fact this beam splitter of 22 * 2 has all only played the effect of 1 * 2 beam splitter.
In Fig. 5, adopt 2 trunk optical fibers 2 and trunk optical fiber 3 to be connected first side ports of described 22 * 2 beam splitter 52 and 53 respectively (as being designated as 52 respectively among the figure
In2With 53
In2), like this, the trunk optical fiber 3 of the bandwidth OLT that is connected with to(for) trunk optical fiber 2 all is the situation of 800M, the ONU that branch optical fiber connected of each output can mean allocation to bandwidth be 200M, increased by one times than the bandwidth among Fig. 4.
The optical splitter that the embodiment of the invention is provided can be applicable to the system bandwidth upgrading, upgrades preceding networking as shown in Figure 4, and the networking after the upgrading as shown in Figure 5.Realize that this upgrading does not need to replace or increases optical splitter, only need directly trunk optical fiber to be inserted into corresponding first side ports and get final product, and the operating time that needs is few that the while can be realized quick switching, like this, also can reduce the influence of business.In this escalation process, the trunk optical fiber 1 before the upgrading can be trunk optical fiber 2 or the trunk optical fiber 3 after the upgrading.
Concrete, the OLT2 after the upgrading can serve 4 ONU in front, and OLT3 can serve next 4 ONU.The uplink and downlink bandwidth ability of supposing OLT2 and OLT3 is 800M, then each ONU of 4 ONU in front and 4 ONU in back can mean allocation to 200M uplink and downlink bandwidth, compare upgrading before, the uplink and downlink bandwidth that each ONU is assigned to can improve 1 times.It should be noted that here OLT2 and OLT3 can be optical line terminal equipments independently physically, also can be arranged on same physical entity but optical line terminal equipment independently in logic.
Wherein, the optical splitter after the upgrading, its port that links to each other with former trunk optical fiber 1 can, or be left other effects, for example test or protection etc.
Wherein, above-mentioned optical splitter finally can constitute the structure of 3:N, N=2
n, n is a natural number, N can be 4,8,16,32 etc.
Referring to Fig. 6 and Fig. 7, Fig. 6 is the schematic diagram of first embodiment of PON system of the present invention 4 * N optical splitter, and Fig. 7 is the schematic diagram of second embodiment of PON system of the present invention 4 * N optical splitter.The basic principle of Fig. 6 and Fig. 7 is identical with Fig. 4 and Fig. 5, and difference is that second beam splitter 61 among Fig. 6 is 2 * 2 beam splitter, and second beam splitter 41 among Fig. 4 is 1 * 2 beam splitter, from each input 61 of second beam splitter 61
In1, 61
In2The input light of input can be divided into the output 61 of two-way from beam splitter 61
Out1, 61
Out2Output, the input of being coupled to first beam splitter 62,63 then.Wherein, OLT1 among Fig. 6 and OLT2 have only an OLT operate as normal usually, and another is as backup.OLT2 among Fig. 7 and OLT4 serve 4 ONU in front and 4 ONU in back respectively, and situation and Fig. 5 are similar, do not repeat them here.
It should be noted that OLT1 among Fig. 6 and OLT2 can be optical line terminal equipments independently physically, also can be arranged on same physical entity but optical line terminal equipment independently in logic.OLT1 and OLT2 are similar among OLT3 among Fig. 7 and OLT4 and Fig. 6.
Certainly, above-mentioned optical splitter embodiment is not limited to the situation that second side ports connects 8 branch optical fibers, also can be 16,32 etc. situation, and the embodiment of the optical splitter of its each beam splitter and 3:N is similar, does not repeat them here.
Wherein, optical splitter finally can constitute the structure of 4:N, N=2 among Fig. 6 and Fig. 7
n, n is a natural number, is 4,8,16,32,64 etc. as N.
Referring to Fig. 8 is automatic switchover PON system embodiment schematic diagram.Optical switch of coupling between trunk optical fiber and 4 * N optical splitter is realized bandwidth upgrading by optical switch and optical splitter in the present embodiment.
Among Fig. 8, light opens the light and is arranged between OLT and the optical splitter, and 4 ports on the right side that light opens the light connect four ports (103～106) (being input) in optical splitter left side, 2 ports (101 of first side of optical switch, 102) connect respectively an OLT (OLT3, OLT4).The annexation of OLT3 and OLT4 and optical splitter before the inner dotted line of optical switch is represented to upgrade among Fig. 8, the annexation of OLT3 and OLT4 and optical splitter after solid line is represented to upgrade.An OLT before the upgrading among OLT3 and the OLT4 provides professional for all ONU that are couple to optical splitter, and another OLT realizes that by the optical switch switching latter two OLT of upgrading is respectively its ONU that connects and provides professional as backup.Can be by the switching of OLT transmitting control commands control optical switch.
When having only an OLT before the upgrading, add and have only OLT3, upgrading needs to increase an OLT4.Wherein, this OLT4 can be an autonomous device physically, also can be the optical line terminal module of an expansion, as a veneer.
Wherein, optical switch can be operated by the attendant among Fig. 8, also can control by local side apparatus, as on optical line terminal OLT or Network Management Equipment, comprising a control module, request that this control module can be switched OLT according to the demand or the user of operator upgrading or failover request or according to certain strategy etc., generate control command, and the notice optical switch switches.Optical switch switches according to control command.Wherein, optical switch can be a single-way switch, also can be bidirectional switch, realizes that the trunk optical fiber side ports is or/and the switching of optical splitter side ports.Wherein, control module can also be a control device independently.
Wherein the optical switch among Fig. 8 can integrate with optical splitter, as the optical switch of employing MOEMS technology and the integrated device of optical splitter.Optical switch also can be arranged between optical line terminal equipment and the trunk optical fiber, near the optical line terminal position.If OLT3 and OLT4 are one physically, optical switch can also be arranged on the optical line terminal.
Wherein, can also between optical splitter and Optical Network Terminal ONU/ONT, optical switch be set, realize the switching of ONU/ONT between the optical splitter output.This optical switch also can receive the control control command of control module, switches according to the control command that receives.
It should be noted that first beam splitter of above-mentioned optical splitter is not limited only to the optical branching device of 2 * 2 optical branching devices and 1 * 2, can be the optical splitter that the optical branching device cascade of the optical branching device of 2 * N (N〉2) and 1 * N (N〉2) forms.Second beam splitter also can be identical with the structure of first beam splitter.
The optical splitter of the multiple-input and multiple-output that the embodiment of the invention provides can provide at least two kinds of inputs, and light is from the input of each input, its output the number difference, this optical splitter makes system configuration and use more flexibly, is convenient to expansion.Therefore, system can select corresponding input to satisfy the needs of different access customer numbers as required when system extension; When using, other application scenario also can select input as required flexibly.For example, system when networking, the optical splitter that adopts the embodiment of the invention to provide, optical splitter can satisfy different access customer number demands or user's average bandwidth demand, does not also need to change optical splitter when system bandwidth is upgraded, and reduces cost.
Though described the embodiment of the invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (10)
1, a kind of optical splitter is characterized in that, has at least two inputs,
First beam splitter, has 2 inputs and N1 output, the output that an input of described first beam splitter is couple to the first input end of described optical splitter and described first beam splitter is couple to N1 output of described optical splitter, to be divided into output light in N1 road from the input light of each input of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second beam splitter, have at least 1 input and N2 output, the input of described second beam splitter is couple to second input of described optical splitter, will be divided into output light in N2 road from the input light of each input of described first beam splitter, wherein, N2 is the integer more than or equal to 2;
At least one output of described second beam splitter is couple to another input of described first beam splitter.
2, optical splitter according to claim 1 is characterized in that,
Described first beam splitter is the beam splitter of one 2 * 2 a plurality of 1 * 2 optical branching devices formation of optical branching device cascade; Wherein, described N1 is 2
n, n is a natural number.
3, optical splitter according to claim 1 and 2 is characterized in that, described optical splitter comprises described first beam splitter of even number, described second beam splitter; Wherein, the number of described N2 is more than or equal to the number of described first beam splitter.
4, a kind of splicer is characterized in that, has at least two outputs,
First closes optical element, have 2 outputs and N1 input, N1 the input that an output of described first beam splitter is couple to first output of described splicer and described first beam splitter is couple to N1 input of described splicer respectively, will be from N1 the input light compositing of importing 1 tunnel output light of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second closes optical element, have at least 1 output and N2 input, described second output of closing optical element is couple to second output of described splicer, will close input light compositing 1 tunnel input light of N2 input of optical element from described first, wherein, N2 is the integer more than or equal to 2;
Described second at least one input of closing optical element is couple to described first another output of closing optical element.
5, a kind of point-to-multi-point optical network system is characterized in that, comprising: optical line terminal OLT, optical splitter and a plurality of Optical Network Terminal ONU/ONT;
Described optical line terminal OLT is couple to an input of described optical splitter by trunk optical fiber;
Described each Optical Network Terminal ONU/ONT is couple to an output of described optical splitter by branch optical fiber;
Described optical splitter has at least two inputs, and described optical splitter also comprises:
First beam splitter, has 2 inputs and N1 output, the output that an input of described first beam splitter is couple to first input end and described first beam splitter is couple to N1 output of optical splitter, to be divided into output light in N1 road from the input light of each input of described first beam splitter, wherein, N1 is the integer more than or equal to 2;
Second beam splitter, has at least 1 input and N2 output, the input of described second beam splitter is couple to second input, to be divided into N2 road output light from the second input light of coming in and going out end, at least one road output of described second beam splitter is couple to another input of described first beam splitter, wherein, N2 is the integer more than or equal to 2.
6, point-to-multi-point optical network according to claim 5 system is characterized in that, further comprises: first switch unit switches to another input with described optical line terminal OLT from an input of optical splitter; And/or
Second switch unit switches to another optical line terminal OLT with an input of described optical splitter from an optical line terminal OLT.
7, point-to-multi-point optical network according to claim 6 system is characterized in that,
Described first switch unit and/or described second switch unit receive and switch indication, switch according to the switching indication that receives.
8, according to claim 6 or 7 described point-to-multi-point optical network systems, it is characterized in that further comprise: described first switch unit and described second switch unit are arranged at one.
9, point-to-multi-point optical network according to claim 5 system is characterized in that, further comprises:
The 3rd switch unit switches to another output with described Optical Network Terminal ONU/ONT from an output of described optical splitter.
10, according to claim 6 or 7 described point-to-multi-point optical network systems, it is characterized in that,
At least one is optical switch for described first switch unit, described second switch unit, described the 3rd switch unit.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946573A (en) * | 2012-11-20 | 2013-02-27 | 杭州电子科技大学 | Passive optical network (PON) optimization method |
| CN104714276A (en) * | 2013-12-13 | 2015-06-17 | 中国移动通信集团公司 | Optical divider and optical coupling unit thereof |
| CN105007116A (en) * | 2014-04-21 | 2015-10-28 | 江苏艾思特信息科技有限公司 | Rapid fiber fault monitoring system |
| CN108462530A (en) * | 2016-12-12 | 2018-08-28 | 中兴通讯股份有限公司 | A kind of optical line terminal test device |
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| US5699176A (en) * | 1995-11-06 | 1997-12-16 | Lucent Technologies Inc. | Upgradable fiber-coax network |
| DE69524751T2 (en) * | 1995-09-21 | 2002-08-22 | Alcatel Sa | Optical gain combining arrangement and method for uplink transmission using such an arrangement |
| JP3630808B2 (en) * | 1995-12-28 | 2005-03-23 | 株式会社ソキア | Non-polarizing beam splitter |
| US6870836B1 (en) * | 2000-03-31 | 2005-03-22 | Nortel Networks Limited | System and method for transfer of IP data in an optical communication networks |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946573A (en) * | 2012-11-20 | 2013-02-27 | 杭州电子科技大学 | Passive optical network (PON) optimization method |
| CN102946573B (en) * | 2012-11-20 | 2015-01-28 | 杭州电子科技大学 | Passive optical network (PON) optimization method |
| CN104714276A (en) * | 2013-12-13 | 2015-06-17 | 中国移动通信集团公司 | Optical divider and optical coupling unit thereof |
| CN105007116A (en) * | 2014-04-21 | 2015-10-28 | 江苏艾思特信息科技有限公司 | Rapid fiber fault monitoring system |
| CN108462530A (en) * | 2016-12-12 | 2018-08-28 | 中兴通讯股份有限公司 | A kind of optical line terminal test device |
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| CN101459473B (en) | 2012-01-25 |
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