CN101136701A - Wavelength division multiplexing optical access transmission system and method - Google Patents
Wavelength division multiplexing optical access transmission system and method Download PDFInfo
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- CN101136701A CN101136701A CN 200610037323 CN200610037323A CN101136701A CN 101136701 A CN101136701 A CN 101136701A CN 200610037323 CN200610037323 CN 200610037323 CN 200610037323 A CN200610037323 A CN 200610037323A CN 101136701 A CN101136701 A CN 101136701A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0226—Fixed carrier allocation, e.g. according to service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
Abstract
This invention discloses a WDM optical access transmission system and a method, in which, the system includes: an optical circuit terminal and a far node, in which, the node connects the terminal with multiple distributed optical network units via fibers, said terminal includes a wide spectrum light source and at least a first WD multiplexer, said far node includes multiple third WD multiplexers and a second comb filter unit coupled with the third multiplexers for dividing a path of optical signals into multiple optical signals in the way of cross and transmits each of the signal to a third WD multiplexer or accumulating the multiple optical signals output by the multiple third WD multiplexers to merge them to a path of optical signals in the way of crossed wavelengths and transmit them to the optical circuit terminal, which can increase user numbers of WDM-PON.
Description
Technical field
The present invention relates to the optical transport technology field, especially relate to a kind of Wavelength division multiplexing optical access transmission system and transmission method thereof.
Background technology
Be the needs of the quick growth of satisfying data communication service, fiber optic network has obtained development fast.Especially EPON (Passive Optical Network, PON) access technology has obtained fast development, the EPON of comparative maturity comprises APON, EPON, BPON and GPON, they all are to adopt beam splitter that luminous power is divided into a plurality of light beams, send corresponding user behind modulating data on each light beam to; In addition, used user shares upstream and downstream bandwidth in the network.
This optical-fiber network has following shortcoming:
1. because the optical power attenuation that beam splitter causes is too big, will cause the number of users of each EPON very limited;
2. owing to user used in the network shares upstream and downstream bandwidth, the raw tape that will cause each user to use is wide not high, and the utilance of network is lower;
3. owing to used user's sharing wavelength in the network communicates, will cause producing in the communication process COMSEC insecurity of security performance difference.
In order to overcome the weak point that EPON itself is had, it is a kind of that (WaveDivision Multiplexer, WDM) wavelength division multiplexed light that combines of the economic performance of the broadband character of technology and EPON inserts EPON (WDM-PON) and has caused that industry pays close attention to widely with wavelength division multiplexing.
As shown in Figure 1, be the topological structure schematic diagram of existing a kind of Wavelength division multiplexing optical access transmission system, it can realize the transmission (comprise uplink and downlink transfer) of a plurality of wavelength optical signals in same optical fiber.
Its downlink transmission process is as follows:
The wide range light that descending wide spectrum light source 111 sends enters array waveguide grating (Array Wave Guide through circulator (Circulator) 120, AWG) 130, wide range light is divided into light beams of different wavelengths, and from the output of the channel of these array waveguide grating 130 correspondences, partial wave through wavelength division multiplexer 143 is injected into loopback light source 142;
After array waveguide grating 130 closes ripple with the light wave of each passage, through circulator 120, enter Optical Fiber Transmission to remote node (Remote Node, RN) 150, and the output channel of the array waveguide grating from remote node 150 151 output, behind wavelength division multiplexer 163 partial waves, enter the receiver 161 of user side 160 at last, downlink data receiving.
Its uplink process and downlink transmission process are similar,
The wide range light process circulator 120 that up-bound wide spectrum light source 112 sends enters the array waveguide grating 151 in the remote node 150, wide range light is divided into light beams of different wavelengths, and is injected into loopback light source 162 from channel process wavelength division multiplexer 163 outputs of these array waveguide grating 130 correspondences; Loopback light source 162 is launched and is injected light equiwavelength's light, and the opening and closing by this loopback light source 162, upstream data. signals is modulated in the output light, pass through the ripple that closes of wavelength division multiplexer 163, array waveguide grating 151 again, after the former road of output light is back to circulator 120, to export light by array waveguide grating 130 and carry out the wavelength decomposition, the wave beam of different wave length enters receiver 141 by wavelength division multiplexer 143.
Because Wavelength division multiplexing optical access transmission system distributes a wavelength for each user, its point-to-point in fact communication, and the point-to-multipoint configuration that on physical structure is, therefore, this network system has the advantage of the high cost economy of holding concurrently of transmission speed; In addition, each user exclusively enjoys a wavelength, and bandwidth can be guaranteed, and security performance is good.
Yet there is following defective in Wavelength division multiplexing optical access transmission system:
1. the number of users of system is subjected to the restriction of wavelength channel quantity, for example, in the present C-band, as if being at interval with 0.8nm, then can only mark off 48 wavelength channels;
2. in addition, after wide spectrum light source was cut apart through the frequency spectrum of array waveguide grating, will having greatly, luminous power was filtered and can not be fully utilized.
Therefore, improve the open ended number of users of WDM-PON system, become the important subject that promotes Wavelength division multiplexing optical access transmission system practicability as how lower cost.
Summary of the invention
The objective of the invention is to propose a kind of Wavelength division multiplexing optical access transmission system and method, can improve the access number of users of WDM-PON system at lower cost.
For addressing the above problem, the present invention discloses a kind of Wavelength division multiplexing optical access transmission system, comprising: optical line terminal, a plurality of distributed optical networks unit reach the remote node that is connected with described optical line terminal and optical network unit by optical fiber;
Wherein, described optical line terminal comprises wide spectrum light source and at least one first wavelength division multiplexer, connects a light Transmit-Receive Unit of described optical line terminal on each channel lines of described each first wavelength division multiplexer respectively;
Described remote node comprises a plurality of the 3rd wavelength division multiplexers, connects an optical network unit on each channel lines of each the 3rd wavelength division multiplexer respectively,
Described remote node also comprises the second comb filtering unit that is coupled with described the 3rd wavelength division multiplexer, be used for one road light signal is divided into multipath light signal with the form that wavelength intersects, and every road light signal is transferred to one the 3rd wavelength division multiplexer respectively, the multipath light signal that perhaps is used for a plurality of the 3rd wavelength division multiplexer outputs is merged into one tunnel optical signal transmission to described optical line terminal with the form that wavelength intersects.
Preferably, described optical line terminal also comprises the first comb filtering unit that is coupling between first wavelength division multiplexer and the 3rd wavelength division multiplexer, be used for one road light signal is divided into multipath light signal with the form that wavelength intersects, every road light signal is transferred to one first wavelength division multiplexer respectively, the multipath light signal that perhaps is used for a plurality of first wavelength division multiplexer outputs is merged into one tunnel optical signal transmission to described remote node with the form that wavelength intersects.
Preferably, the described first comb filtering unit, the second comb filtering unit are the interconnected comb filter formation of two-stage at least.
Preferably, the described first comb filtering unit, the second comb filtering unit are a comb filter.
Accordingly, the present invention also provides a kind of wavelength division multiplexed light access transmission method, in the process of its downlink optical signal transmission, comprises the steps:
(a) the first comb filtering unit is divided into multipath light signal with the light signal that wide spectrum light source sent of optical line terminal;
(b) first corresponding with the every road light signal wavelength division multiplexer becomes a plurality of wavelength optical signals with described every road light signal partial wave, and by the first loopback light source it is carried out data signal modulation respectively;
(c) described first wavelength division multiplexer is multiplexing through carrying out to described modulated light signal, and one road light signal is merged into the multipath light signal after described a plurality of first wavelength division multiplexers output multiplexing in the first comb filtering unit, enters remote node through Optical Fiber Transmission;
(d) the second comb filtering unit in the remote node is divided into multipath light signal with described light signal from optical fiber, and three wavelength division multiplexer corresponding with every road light signal carries out demultiplexing with described every road light signal and handle and be sent to respectively corresponding optical network unit.
Preferably, further comprise in the described step (b):
(b1) each wavelength optical signals is injected into the first loopback light source of a correspondence;
(b2) the described first loopback light source will need data signals transmitted to be modulated to the light signal of described injection, and export modulated light signal.
Preferably, further comprise in the described step (d):
Receiver in the optical network unit receives and resolves the light signal behind the described demultiplexing.
Preferably, the described first comb filtering unit, the second comb filtering unit include the interconnected comb filter of two-stage at least.
Preferably, the described first comb filtering unit, the second comb filtering unit are a comb filter.
Accordingly, the invention provides a kind of wavelength division multiplexed light access transmission method, in the process of traveling optical signal transmission thereon, comprise the steps:
(a) the second comb filtering unit is divided into multipath light signal with the light signal that wide spectrum light source sent of optical line terminal;
(b) the 3rd corresponding with every road light signal wavelength division multiplexer becomes a plurality of wavelength optical signals with described every road light signal partial wave, and carries out data signal modulation by the second loopback light source respectively;
(c) described the 3rd wavelength division multiplexer carries out multiplexingly to modulated light signal, and the second comb filtering unit merges into one road light signal with the multipath light signal after described a plurality of the 3rd wavelength division multiplexers output multiplexing, enters optical line terminal through Optical Fiber Transmission;
(d) the first comb filtering unit in the optical line terminal is divided into multipath light signal with described light signal from optical fiber, and first wavelength division multiplexer corresponding with every road light signal carries out demultiplexing with described every road light signal and handle and be sent to respectively a receiver.
Preferably, further comprise in the described step (b):
(b1) each wavelength optical signals is injected into the second loopback light source of a correspondence;
(b2) the described second loopback light source will need data signals transmitted to be modulated to the light signal of described injection, and export modulated light signal.
Preferably, the described first comb filtering unit, the second comb filtering unit include the interconnected comb filter of two-stage at least.
Preferably, the described first comb filtering unit, the second comb filtering unit are a comb filter.
Compared with prior art, the present invention has following beneficial effect:
1. because the present invention has all introduced the comb filtering unit at optical line terminal and remote node, by the comb filtering unit with the wavelength cross modal, the mode that odd number wavelength in the light signal and even number wavelength are separated, wide range light signal or multiple wavelength optical signal are divided into multipath light signal, every road light signal has wavelength division multiplexer to carry out partial wave to be treated to corresponding a plurality of wavelength optical signals of transmitting again in optical channel, therefore, the present invention has made full use of the part optical signals that in the past was filtered, the present invention adopts the wide range light signal or the multiple wavelength optical signal of same spectra density, can improve the optical channel number to user's service greatly;
2. in addition, because it is better to the isolation of the light signal of each optical channel transmission to constitute the comb filter of comb filtering unit, though after adopting the comb filtering unit, the wavelength interval of the light signal of different optical channel transmission narrows down, but, isolation between the different wave length light signal is still than the isolation height between the light signal of single wavelength division multiplexer output in the prior art, and therefore, crosstalking of the light signal of different optical channel transmission of the present invention is less.
Description of drawings
Fig. 1 is the topological schematic diagram of existing a kind of Wavelength division multiplexing optical access transmission system.
Fig. 2 is the topological schematic diagram of Wavelength division multiplexing optical access transmission system of the present invention.
Fig. 3 is the operation principle schematic diagram of the mentioned comb filter of the present invention.
Fig. 4 is the topological schematic diagram of the mentioned comb filtering unit of the present invention.
Fig. 5 is for adopting the Wavelength division multiplexing optical access transmission system schematic diagram of comb filtering shown in Figure 4 unit.
Embodiment
Please refer to shown in Figure 2ly, be the topological schematic diagram of Wavelength division multiplexing optical access transmission system of the present invention.Native system is a Wave division multiplexing passive optical network (WDM-PON) system, and this system comprises:
Optical line terminal (Optical Line Terminal, OLT) 210, and connect described optical line terminal 210 and a plurality of distributed optical networks unit (Optical Network Unit, ONU) 230 remote node (Remote Node, RN) 220 by optical fiber.Wherein,
Be used separately as wide spectrum light source (BLS) 211 and the wide spectrum light source (BLS) 212 of line light source and following line light source, this two wide spectrum light source is connected on the circulator 213;
The first comb filtering unit 214 links to each other with described circulator 213;
A plurality of first wavelength division multiplexers 215 couple with the described first comb filtering unit 214, and each first wavelength division multiplexer 215 is told the multichannel optical channel;
A plurality of second wavelength division multiplexers 216, one side is connected on the optical channel of one first wavelength division multiplexer 215, opposite side is connected with first receiver 218 with the first loop light source 217, and this first loop light source 217 and first receiver 218 have constituted a light Transmit-Receive Unit of this optical line terminal 210;
Wherein, the first comb filtering unit 214 is used for one road light signal is divided into multipath light signal with the form that wavelength intersects, every road light signal is transferred to one first wavelength division multiplexer 215 respectively, the multipath light signal that perhaps is used for 215 outputs of a plurality of first wavelength division multiplexer is merged into one tunnel optical signal transmission to described remote node 220 with the form that wavelength intersects.
And remote node 220 comprises:
The second comb filtering unit 221 is connected with described circulator 213 by optical fiber;
A plurality of the 3rd wavelength division multiplexers 222 couple with the described second comb filtering unit 221, and each the 3rd wavelength division multiplexer 222 is told the multichannel optical channel;
A plurality of the 4th wavelength division multiplexers 231, one side are connected on the optical channel of one the 3rd wavelength division multiplexer 222, and opposite side is connected with second receiver 233 with the second loop light source 232; Described one the 4th wavelength division multiplexer 231, the second loop light source 232 and second receiver 233 constitute a network element 230;
Wherein, the second comb filtering unit 221 is used for one road light signal is divided into multipath light signal with the form that wavelength intersects, and every road light signal is transferred to one the 3rd wavelength division multiplexer 222 respectively, the multipath light signal that perhaps is used for 222 outputs of a plurality of the 3rd wavelength division multiplexer is merged into one tunnel optical signal transmission to described optical line terminal 210 with the form that wavelength intersects.
Wherein, first comb filter 214 has identical operation principle with second comb filter 221, sees also shown in Figure 3.
Comb filter is one three port devices, and one is input port, and two other is output port (shown in a solid line among the figure); Perhaps, two is input port, and another one is output port (as shown in phantom in FIG.).This comb filter is used for a multiple wavelength optical signal from the input port input, wavelength according to this light signal, light signal with the wavelength cross modal, is separated into two ways of optical signals with the light signal of odd number wavelength and even number wavelength, respectively from two output ports outputs; Otherwise this comb filter is used for the two ways of optical signals from two input port inputs, and with the form that odd number wavelength and even number wavelength intersect, merging becomes one road light signal, and exports from output port.
At C-band, wavelength division multiplexer is at interval with 0.8nm, light signal can be divided into the transmission channel of 48 light signals at most according to wavelength; In the present invention, because after having used comb filter that light signal is separated into two-way, every road light signal can be the light signal of 48 optical channel transmission with the light signal partial wave through wavelength division multiplexer, therefore, the present invention is doubled optical channel number, and promptly the number of users of this WDM-PON system can double.
In addition, among the present invention, first comb filter 214 and second comb filter 221 can adopt the comb filtering unit to substitute, described comb filtering unit is meant by at least two comb filter cascades and constitutes, seeing also shown in Figure 4ly, is a comb filtering unit that is made of 3 comb filter cascades.Wherein, comb filter 1 is divided into the light signal of two-way crossover wavelength with wide range light signal or multiple wavelength optical signal, and then, comb filter 2 and 3 is divided into the light signal of two-way crossover wavelength again respectively with this two ways of optical signals.Therefore, this comb filtering unit has increased 4 times with the spectral density of light signal, and is corresponding, adopts the WDM-PON system of the interconnected comb filtering unit of this two-stage, and prior art can improve number of users 4 times relatively, promptly extends to 192 users.
See also shown in Figure 5, for adopting the WDM-PON system schematic of the interconnected comb filtering unit of two-stage shown in Figure 4.At this enumeration no longer.
Correspondingly, the invention provides a kind of wavelength division multiplexing optical transmission method, this method is applied in the Wavelength division multiplexing optical access transmission system of aforesaid Fig. 2 or Fig. 5, and it comprises downlink optical signal transmission and uplink optical signal transmission course, now is described in detail as follows in conjunction with Fig. 2:
The course of work of its descending optical transmission is as follows:
The broadband light that descending wide spectrum light source (BLS) 212 sends or the light signal of multi-wavelength light are through circulator 213 directional transmissions to the first comb filter 214;
First wavelength division multiplexer 215 carries out the partial wave processing with the light signal of input input, is divided into a plurality of optical transmission channels, each Channel Transmission wavelength optical signals;
The light signal of each channel is handled by the partial wave (demultiplexing) of second wavelength division multiplexer 216, and light signal is injected into the first loopback light source 217;
The first loopback light source 217 is launched the light signal with the light signal equiwavelength who is injected, and the unlatching of passing through the first loopback light source, 217 switches is modulated to the need data signals transmitted in the output light signal of the first loopback light source 217 with closed;
Second wavelength division multiplexer 216 closes ripple (multiplexing) processing with the output light signal of a plurality of first loopback light sources 217;
First wavelength division multiplexer 215 with each Channel Transmission wavelength optical signals multiplexing after, be output as a branch of light signal;
The two-beam signal that first comb filter 214 is exported two first wavelength division multiplexers 215 respectively with interleaved mode merges, and through circulator 213, enters remote node 220;
To be similar to the mode of first comb filter 214, the form of intersecting with wavelength is divided into two-way with light signal to second comb filter 221 in the remote node 220, enters two the 3rd wavelength division multiplexers 222 respectively with light signal;
The 3rd wavelength division multiplexer 222 to be being similar to the mode of first wavelength division multiplexer 215, and the light signal demultiplexing is divided into the signal of a plurality of wavelength, and the light signal of each wavelength is respectively in different optical transmission Channel Transmission;
The light signal of each optical transmission Channel Transmission enters the 4th wavelength division multiplexer 231 by optical fiber, by 231 pairs of light signal demultiplexings of the 4th wavelength division multiplexer, data signals transmitted is separated from light signal, sends to second receiver 233.
The course of work of the up optical transmission of native system and the course of work of descending optical transmission are similar, and be roughly as follows:
Wide range light signal or multiple wavelength optical signal that up-bound wide spectrum light source (BLS) 211 sends are after circulator 213, Optical Fiber Transmission, to remote node 220;
After first comb filter 214 is divided into two-way with light signal with interleaved mode, enter two first wavelength division multiplexers 215 respectively, after carrying out demultiplexing by 215 pairs of every roads of first wavelength division multiplexer light signal, after the light signal of each optical channel transmission was handled by the partial wave of second wavelength division multiplexer 216, transmission of data signals was received by first receiver 218.
In sum, because the present invention has all introduced the comb filtering unit at optical line terminal and remote node, by the comb filtering unit wide range light signal or multiple wavelength optical signal are divided into multipath light signal with the wavelength cross modal, every road light signal has wavelength division multiplexer to carry out the wavelength optical signals that partial wave is treated to corresponding how last optical channel transmission again, therefore, the present invention adopts the wide range light signal or the multiple wavelength optical signal of same spectra density, can improve the optical channel number to user's service greatly; In addition, because it is better to the isolation of the light signal of each optical channel transmission to constitute the comb filter of comb filtering unit, though after adopting the comb filtering unit, the wavelength interval of the light signal of different optical channel transmission narrows down, but, isolation between the different wave length light signal is still than the isolation height between the light signal of single wavelength division multiplexer output in the prior art, and therefore, crosstalking of the light signal of different optical channel transmission of the present invention is less.
Above disclosed only is preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of being done according to the present patent application claim still belongs to the scope that the present invention is contained.
Claims (13)
1. Wavelength division multiplexing optical access transmission system comprises: optical line terminal, a plurality of distributed optical networks unit, and the remote node that is connected with described optical line terminal and optical network unit by optical fiber; Wherein,
Described optical line terminal comprises wide spectrum light source and at least one first wavelength division multiplexer, connects a light Transmit-Receive Unit of described optical line terminal on each channel lines of described each first wavelength division multiplexer respectively;
Described remote node comprises a plurality of the 3rd wavelength division multiplexers, connects an optical network unit on each channel lines of each the 3rd wavelength division multiplexer respectively;
It is characterized in that:
Described remote node also comprises the second comb filtering unit that is coupled with described the 3rd wavelength division multiplexer, be used for one road light signal is divided into multipath light signal with the form that wavelength intersects, and every road light signal is transferred to one the 3rd wavelength division multiplexer respectively, perhaps be used to converge the multipath light signal of a plurality of the 3rd wavelength division multiplexer outputs, merge into one tunnel optical signal transmission to described optical line terminal with the form that wavelength intersects.
2. Wavelength division multiplexing optical access transmission system according to claim 1, it is characterized in that, described optical line terminal also comprises the first comb filtering unit that is coupling between first wavelength division multiplexer and the 3rd wavelength division multiplexer, be used for one road light signal is divided into multipath light signal with the form that wavelength intersects, every road light signal is transferred to one first wavelength division multiplexer respectively, perhaps be used to converge the multipath light signal of a plurality of first wavelength division multiplexer outputs, merge into one tunnel optical signal transmission to described remote node with the form that wavelength intersects.
3. Wavelength division multiplexing optical access transmission system according to claim 1 and 2 is characterized in that, the described first comb filtering unit, the second comb filtering unit include the interconnected comb filter of two-stage at least.
4. Wavelength division multiplexing optical access transmission system according to claim 1 and 2 is characterized in that, the described first comb filtering unit, the second comb filtering unit are a comb filter.
5. a wavelength division multiplexed light access transmission method is characterized in that, in the process of its downlink optical signal transmission, comprises the steps:
(a) the first comb filtering unit is divided into multipath light signal with the light signal that wide spectrum light source sent of optical line terminal;
(b) first corresponding with the every road light signal wavelength division multiplexer becomes a plurality of wavelength optical signals with described every road light signal partial wave, and by the first loopback light source it is carried out data signal modulation respectively;
(c) described first wavelength division multiplexer is multiplexing through carrying out to described modulated light signal, and one road light signal is merged into the multipath light signal after described a plurality of first wavelength division multiplexers output multiplexing in the first comb filtering unit, enters remote node through Optical Fiber Transmission;
(d) the second comb filtering unit in the remote node is divided into multipath light signal with described light signal from optical fiber, and three wavelength division multiplexer corresponding with every road light signal carries out demultiplexing with described every road light signal and handle and be sent to respectively corresponding optical network unit.
6. wavelength division multiplexed light access transmission method according to claim 5 is characterized in that, further comprises in the described step (b):
(b1) each wavelength optical signals is injected into the first loopback light source of a correspondence;
(b2) the described first loopback light source will need data signals transmitted to be modulated to the light signal of described injection, and export modulated light signal.
7. wavelength division multiplexed light access transmission method according to claim 5 is characterized in that, further comprises in the described step (d):
Receiver in the optical network unit receives and resolves the light signal behind the described demultiplexing.
8. according to each described wavelength division multiplexed light access transmission method of claim 5-7, it is characterized in that the described first comb filtering unit, the second comb filtering unit include the interconnected comb filter of two-stage at least.
9. according to each described wavelength division multiplexed light access transmission method of claim 5-7, it is characterized in that the described first comb filtering unit, the second comb filtering unit are a comb filter.
10. a wavelength division multiplexed light access transmission method is characterized in that, in the process of traveling optical signal transmission thereon, comprises the steps:
(a) the second comb filtering unit is divided into multipath light signal with the light signal that wide spectrum light source sent of optical line terminal;
(b) the 3rd corresponding with every road light signal wavelength division multiplexer becomes a plurality of wavelength optical signals with described every road light signal partial wave, and carries out data signal modulation by the second loopback light source respectively;
(c) described the 3rd wavelength division multiplexer carries out multiplexingly to modulated light signal, and the second comb filtering unit merges into one road light signal with the multipath light signal after described a plurality of the 3rd wavelength division multiplexers output multiplexing, enters optical line terminal through Optical Fiber Transmission;
(d) the first comb filtering unit in the optical line terminal is divided into multipath light signal with described light signal from optical fiber, and first wavelength division multiplexer corresponding with every road light signal carries out demultiplexing with described every road light signal and handle and be sent to respectively a receiver.
11. wavelength division multiplexed light access transmission method according to claim 10 is characterized in that, further comprises in the described step (b):
(b1) each wavelength optical signals is injected into the second loopback light source of a correspondence;
(b2) the described second loopback light source will need data signals transmitted to be modulated to the light signal of described injection, and export modulated light signal.
12., it is characterized in that the described first comb filtering unit, the second comb filtering unit include the interconnected comb filter of two-stage at least according to claim 10 or 11 described wavelength division multiplexed light access transmission methods.
13., it is characterized in that the described first comb filtering unit, the second comb filtering unit are a comb filter according to claim 10 or 11 described wavelength division multiplexed light access transmission methods.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610037323 CN101136701B (en) | 2006-08-28 | 2006-08-28 | Wavelength division multiplexing optical access transmission system and method |
| PCT/CN2007/070575 WO2008034378A1 (en) | 2006-08-28 | 2007-08-28 | A wave division multiplexing optical access transmission system, method and device |
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| CN 200610037323 CN101136701B (en) | 2006-08-28 | 2006-08-28 | Wavelength division multiplexing optical access transmission system and method |
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| WO2008034378A1 (en) | 2008-03-27 |
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