CN104320179A - Point of tangency of tangent ring remote node device in wavelength division multiplexing passive optical network system - Google Patents
Point of tangency of tangent ring remote node device in wavelength division multiplexing passive optical network system Download PDFInfo
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Abstract
The present invention relates to a point of tangency of tangent ring remote node device in a wavelength division multiplexing passive optical network system, and belongs to the technical field of optical fiber communication. The point of tangency of tangent ring remote node device in the wavelength division multiplexing passive optical network system of the present invention includes: a first optical coupler used for dividing an optical signal into three paths, and an arrayed waveguide grating AWG for connecting an optical network unit ONU, wherein an input end of the first optical coupler is connected to a main ring optical fiber through an optical switch, one output end of the first optical coupler is connected to the AWG, and other two transmission branches are respectively connected to the main ring optical fiber and a sub-ring optical fiber through corresponding optical circulators. The present invention achieves that the signal clockwise or anticlockwise transmits in the main ring and the sub-ring to arrive each main ring and sub-ring remote node through connecting the optical switch, connecting and breaking the combination of the optical switch and the optical circulators, thereby achieving the protection of each level of nodes of the network and extension of the scale of the network.
Description
Technical field
The present invention relates to the tangent rings point of contact distant-end node device in a kind of WDM passive optical network system, belong to technical field of optical fiber communication.
Background technology
Wave division multiplexing passive optical network (WDM-PON) technology can realize system bandwidth upgrading when not changing network physical equipment by increasing the number of wavelengths carried in simple optical fiber, increase substantially network transmission capacity, realize virtual point-to-point transmission, and the wavelength dedicated that each user uses network to distribute carries out information transmission, information is not shared between each user, thus effectively prevent information leakage, there is good fail safe, gather around in optical access network field and have broad application prospects, be considered to following fiber-to-the-home final selection.The current research to WDM-PON is mainly based on the type of static Wavelength Assignment, wavelength is fixing to optical network unit ONU Ce Xia road in RN, when user's request changes, the dynamic dispatching of internal system wavelength is not realized by adjustment, therefore, when user's variation or increase and decrease, redistribute to the bandwidth of system and make troubles.Simultaneously, WDM-PON system topological is main or based on star, the basic topology such as tree-like, when a failure occurs, the network system of above topology structure cannot find new transmission route and self-healing scheme for interrupted business within the short time, cause bust this, the reliability of influential system.
Summary of the invention
The object of this invention is to provide the tangent rings point of contact distant-end node device in a kind of WDM passive optical network system, be difficult to solve current WDM passive optical network system due to system that its topological structure causes the problem expanded and reliability is low.
Technical scheme of the present invention is: the tangent rings point of contact distant-end node device in a kind of WDM passive optical network system, this point of contact distant-end node device includes light distributor for light signal being divided into three tunnels and the array waveguide grating AWG being used for being connected with optical network unit ONU, the input of described light distributor is connected to main ring optical fiber by optical switch, described light distributor output is connected with array waveguide grating AWG, two other output by corresponding optical circulator or optical coupler respectively with main ring optical fiber and subring Fiber connection.
In three outputs of described light distributor, at least one exports on branch road and is provided with wavelength resistance block device, does not belong to the signal of wavelength needed for this road for filtering.
Transmission branch between described light distributor and subring optical fiber is provided with two optical circulators arranged side by side, first port of described two optical circulators arranged side by side all passes through the second optical coupler and is connected with the output of light distributor, second port is all connected to subring optical fiber respectively by corresponding optical switch, is serially connected with break-make optical switch between the first port of one of them optical circulator and the second optical coupler.
Be provided with the second optical circulator between described first optical coupler and array waveguide grating AWG, the first port of this second optical circulator is connected with the output of the first optical coupler, and the second port of optical circulator is connected with array waveguide grating AWG.
Described light distributor is the first optical coupler, and the input of the first optical coupler is connected to optical switch by the first optical circulator.
Described light distributor comprises the first Coarse Wave Division Multiplexer CWDM and the first optical coupler, the input of the first Coarse Wave Division Multiplexer CWDM is connected to optical switch by the first optical circulator, light signal is divided into two-way by affiliated wave band, one tunnel is used for and main ring Fiber connection, another road is connected to the first optical coupler, first optical coupler is divided into two-way by power, and a road is connected with array waveguide grating AWG, and another road is used for being connected to subring optical fiber.
The described output branch road be connected with main ring optical fiber is provided with the 3rd optical circulator, and the first port of this optical circulator is connected with the output of the first optical coupler, and the second port is connected to main ring optical fiber by optical switch.
Output branch road between described first Coarse Wave Division Multiplexer CWDM and main ring optical fiber is provided with the 3rd optical coupler, the input of the 3rd optical coupler is connected with the output of the first Coarse Wave Division Multiplexer CWDM, and the output of the 3rd optical coupler is by optical switch and main ring Fiber connection.
The invention has the beneficial effects as follows: the tangent rings point of contact distant-end node device in WDM passive optical network system of the present invention includes the first optical coupler for light signal being divided into three tunnels and the array waveguide grating AWG being used for being connected with optical network unit ONU, the input of the first optical coupler is connected to main ring optical fiber by optical switch, an output of described first optical coupler is connected with array waveguide grating AWG, and two other transmission branch is respectively by corresponding optical circulator and main ring optical fiber and subring Fiber connection.The present invention realizes signal by the combination of optical switch connection status, break-make optical switch and optical circulator and arrives each main ring and subring distant-end node at main ring and subring along clockwise or counterclockwise transmission, thus realizes the protection of network node at different levels and the expansion of network size.
Accompanying drawing explanation
Fig. 1 is the tangent rings point of contact distant-end node structure drawing of device in the WDM passive optical network system in the embodiment of the present invention one;
Fig. 2 is the tangent rings point of contact distant-end node structure drawing of device in the WDM passive optical network system in the embodiment of the present invention two;
Fig. 3 is the tangent rings point of contact distant-end node structure drawing of device in the WDM passive optical network system in the embodiment of the present invention three;
Fig. 4 is the structure chart of the WDM passive optical network system based on single fiber;
Fig. 5 is the structure chart of the WDM passive optical network system based on two fibre.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
Tangent rings point of contact distant-end node device in WDM passive optical network system of the present invention is applicable to the passive optical network of tangent rings structure, this passive optical network, be made up of tangent rings structure, wherein main ring connects M main ring distant-end node RN by optical line terminal OLT 29 by monomode fiber and main ring feeder fiber
a31,32,1,34,35 formed, subring is point of contact by monomode fiber and subring feeder fiber and N number of subring far-end node RN by distant-end node on main ring
b36,37,38,39,40 connect formation, each main ring distant-end node RN on main ring
a31,32,34,35 respectively connect q optical network unit by profile fiber, each subring distant-end node RN in subring
b36,37,38,39,40 respectively connect q optical network unit by profile fiber.Here difference is selected according to point of contact distant-end node, monomode fiber in main ring and subring can be one, also can be two, as shown in Figure 4 and Figure 5, distant-end node device in WDM passive optical network system of the present invention comprises the first optical coupler 8 for light signal being divided into three tunnels and the array waveguide grating AWG21 being used for being connected with optical network unit ONU 23, the input of the first optical coupler 8 is connected to main ring optical fiber by optical switch, an output branch road of the first optical coupler 8 is connected with array waveguide grating AWG, two other exports branch road respectively by corresponding optical circulator and main ring optical fiber and subring Fiber connection.Formation and the working method of the tangent rings point of contact distant-end node device in WDM passive optical network system of the present invention are described below in conjunction with concrete structure chart.
Embodiment one
In the present embodiment, the WDM passive optical network system at tangent rings point of contact distant-end node device place as shown in Figure 4, this network system is made up of two tangent structures of ring, and wherein main ring connects M main ring distant-end node RN by optical line terminal OLT 29 by monomode fiber and main ring feeder fiber 41
a31,32,34 and 35 formed, subring is by a distant-end node RN on main ring
m1 is point of contact by monomode fiber and subring feeder fiber 43 and N number of subring far-end node RN
b36,37,39 to be connected with 40 formation, each main ring distant-end node RN on main ring
aq optical network unit is respectively connected, each subring distant-end node RN in subring by profile fiber
bq optical network unit is respectively connected by profile fiber.
Tangent rings point of contact distant-end node device RN in WDM passive optical network system in the present embodiment
m1 as shown in Figure 1, comprise 12 × 2 optical switch, 2,1 break-make optical switch, 13,2 wavelength blocker WB11,12, first ~ the 55 optical circulator, 3,4,5,6,7, first ~ the 33 optical coupler, 8,9,10 and 11 × k array waveguide grating AWG21.The input of the first optical coupler 8 is connected with main ring optical fiber feeder with 2 × 2 optical switches 2 by the first optical circulator 3.Light signal is divided into three tunnels by the first optical coupler 8, first branch road is that subring exports branch road, this branch road comprises the first optical wavelength block device WB11, second optical coupler 9, 3rd optical coupler 10, 3rd optical circulator 5 and the 4th optical circulator 6, the input of the 3rd optical coupler 10 is connected with an output of the first optical coupler 8 by the first optical wavelength block device WB11, two outputs of the 3rd optical coupler 10 are connected to the 3rd optical circulator 5 respectively and are connected to the first port of the 4th optical circulator 6 by break-make optical switch 13, second port of the 3rd optical circulator 5 and the 4th optical circulator 6 is connected in the both direction of subring feeder fiber respectively, break-make optical switch 13 is serially connected between the output of the 3rd optical coupler 10 and the first port of the 4th optical circulator 6, 3rd port of the 3rd optical circulator 5 and the 4th optical circulator 6 is connected to two inputs of the second optical coupler 9 respectively, the output of the second optical coupler 9 is connected to the first port of the first optical circulator 3, second branch road is that optical network unit ONU 23 exports branch road, this output branch road comprises the second optical circulator 4 and 11 × k array waveguide grating AWG21, first port of the second optical circulator 4 is connected with an output of the first optical coupler 8, second port of the second optical circulator 4 is connected with array waveguide grating AWG21, 3rd port of the second optical circulator 4 is connected with an input of the second optical coupler 9, array waveguide grating AWG21 connects q optical network unit ONU 23 by profile fiber 22, each optical network unit ONU comprises 1 optical coupler 24, 1 receiver RX25 and 1 reflective semiconductor optical amplifier RSOA26, in optical network unit ONU 23, signal is delivered in optical receiver RX25 and reflective semiconductor optical amplifier RSOA26 by optical coupler 24 by downstream signal respectively, 3rd branch road is main ring transmission branch, this transmission branch comprises second wave length block device WB12 and the 5th optical circulator 7, the input of the second optical wavelength block device WB12 is connected with an output of the first optical coupler 8, the output of the second optical wavelength block device WB12 is connected with the first port of the 5th optical circulator 7, second port of the 5th optical circulator 7 is connected with main ring feeder fiber by the another port of 2 × 2 optical switches 2, and the 3rd port of the 5th optical circulator 7 is connected to an input of the second optical coupler 9.
The working method of the tangent rings point of contact distant-end node device in the WDM passive optical network system in the present embodiment is as follows, when the main ring feeder fiber be connected with this distant-end node device and subring feeder fiber are all normal, 2 × 2 optical switches 2 will be placed in parallel connection status, break-make optical switch 13 disconnects, downstream signal transmits in a clockwise direction in main ring feeder fiber, downstream signal enters from 2 × 2 optical switches 2, after the first optical circulator 3, three parts are divided into by power ratio by the first optical coupler 8, here this three part signal is called signal A, signal B, signal C.After signal A is belonged to the wavelength of main ring user use by first wave length block device WB11 filtering, more successively by entering subring feeder fiber after the 3rd optical coupler 10 and the 3rd optical circulator 5; Signal B is pressed Wavelength branching by after the second optical circulator 4 by array waveguide grating AWG21, corresponding downstream signal k port below array waveguide grating AWG21 exports, and arrive corresponding optical network unit ONU 23 by profile fiber 22, after pressing power partial wave by the optical coupler 24 in optical network unit ONU 23, a part of signal is sent into optical receiver RX25, another part light signal is sent into reflective semiconductor optical amplifier RSOA26, and signal is wiped free of remodulates Hou Yanyuan road again and returns main ring far-end node RN
min 1, more successively through main ring far-end node RN
mget back to main ring feeder fiber after array waveguide grating AWG21 in 1, the second optical circulator 4, second optical coupler 9, first optical circulator 3 and 2 × 2 optical switch 2 and carry out uplink in the counterclockwise direction; Signal C by second wave length block device WB12 filtering belong to user in the user of main ring far-end node and connected subring after the wavelength that uses, get back in main ring feeder fiber by after the 5th optical circulator 7 and 2 × 2 optical switch 2 successively, continue downstream signal transmission along clockwise direction.
When fracture appears in main ring feeder fiber 41, tangent rings point of contact distant-end node device RN
m2 × 2 optical switches 2 in 1 will be placed in cross-connection state, and signal transmission direction mode in main ring is changed.
In main ring, downstream signal transmission direction is counterclockwise:
OLT→RN
M→......→RN
m+1→RN
m→RN
m-1→......→RN
1
In main ring, uplink signal transmissions direction is clockwise direction:
RN
1→......→RN
m-1→RN
m→RN
m+1→......→RN
M→OLT
All the other transmitting procedures do not change, and by the change of 2 × 2 optical switch 2 connection status, realize the change of main ring feeder fiber transmission direction, in time for Signal transmissions finds new path, realize the protection to system.
When subring feeder fiber 43 breaks down, break-make optical switch 13 closes, after signal A is belonged to the wavelength of main ring user use by first wave length block device WB11 filtering, again successively by entering subring feeder fiber after the 3rd optical coupler 10, break-make optical switch 13 and the 4th optical circulator 6, the transmission direction of signal in subring is changed.
The transmission direction of subring downstream signal is counterclockwise:
OLT→RN
1→......→RN
m-1→RN
m→RN
*N→......→RN
*n+1→RN
*n→RN
*n-1→......→RN
*1
Subring uplink signal transmissions direction is clockwise direction:
RN
*1→......→RN
*n-1→RN
*n→RN
*n+1→......→RN
*N→RN
m→RN
m-1→......→RN
1→OLT
When main ring and subring feeder fiber all break down, 2 × 2 optical switches 2 will be placed in cross-connection state, and break-make optical switch 13 closes, and the transmission direction in main ring and subring is all changed.By the change of main ring feeder fiber and the transmission direction of subring feeder fiber, in time for Signal transmissions finds new path, realize the protection to system.
In main ring, downstream signal transmission direction is counterclockwise (solid arrow):
OLT→RN
M→......→RN
m+1→RN
m→RN
m-1→......→RN
1
In main ring, uplink signal transmissions direction is clockwise direction:
RN
1→......→RN
m-1→RN
m→RN
m+1→......→RN
M→OLT
The transmission direction of subring downstream signal is counterclockwise:
OLT→RN
M→......→RN
m+1→RN
m→RN
*N→......→RN
*n+1→RN
*n→RN
*n-1→......→RN
*1
Subring uplink signal transmissions direction is clockwise direction:
RN
*1→......→RN
*n-1→RN
*n→RN
*n+1→......→RN
*N→RN
m→RN
m+1→......→RN
M→OLT
Embodiment two
In the present embodiment, the WDM passive optical network system at tangent rings point of contact distant-end node device place as shown in Figure 4, the concrete structure of system has been described in detail in embodiment one, tangent rings point of contact distant-end node device in WDM passive optical network system in this enforcement as shown in Figure 2, comprise 12 × 2 optical switch 2,1 break-make optical switch 13,1 wavelength blocker WB11,4 optical circulators 3,4,5,6,6 optical couplers, 8,9,10,14,15,16 and 11 × k array waveguide grating AWG21.The input of the first optical coupler 8 is connected to one end of 2 × 2 optical switches 2 by the first optical circulator 3, be connected with main ring optical fiber feeder through 2 × 2 optical switches 2.Light signal is divided into three tunnels by the first optical coupler 8, first branch road is subring transmission branch, this branch road comprises the first optical wavelength block device WB11, second optical coupler 9, 3rd optical coupler 10, 4th optical coupler 14, 5th optical coupler 16, 3rd optical circulator 5 and the 4th optical circulator 6, the input of the 3rd optical coupler 10 is connected with an output of the first optical coupler 8 by wavelength blocker WB11, two outputs of the 3rd optical coupler 10 are connected to the 3rd optical circulator 5 respectively and are connected to the first port of the 4th optical circulator 6 by break-make optical switch 13, second port of the 3rd optical circulator 5 and the 4th optical circulator 6 is connected in the both direction of subring feeder fiber respectively, break-make optical switch 13 is serially connected between the output of the 3rd optical coupler 10 and the first port of the 4th optical circulator 6, 3rd port of the 3rd optical circulator 5 and the 4th optical circulator 6 is connected to two inputs of the 4th optical coupler 14 respectively, and the first port of the first optical circulator 3 is connected to through the 6th optical coupler 16 and the second optical coupler 9, second branch road is optical network unit ONU transmission branch, this transmission branch comprises the second optical circulator 4 and 11 × k array waveguide grating AWG21, first port of the second optical circulator 4 is connected with an output of the first optical coupler 8, second port of the second optical circulator 4 is connected with array waveguide grating AWG21, 3rd port of the second optical circulator 4 is connected with six optical coupler 16 inputs, the first port of the first optical circulator 3 is connected to through the second optical coupler 9, array waveguide grating AWG21 connects q optical network unit ONU 23 by profile fiber 22, each optical network unit ONU comprises 1 optical coupler 24, 1 receiver RX25 and 1 reflective semiconductor optical amplifier RSOA26, in optical network unit ONU 23, signal is delivered in optical receiver RX25 and reflective semiconductor optical amplifier RSOA26 by optical coupler 24 by downstream signal respectively, 3rd branch road is main ring transmission branch, this transmission branch comprises the 5th optical coupler 15, a port of the 5th optical coupler 15 is connected with an output of the first optical coupler 8, and another port of the 3rd optical coupler 15 is connected to the other direction of main ring feeder fiber through 2 × 2 optical switches 2.
The working method of the tangent rings point of contact distant-end node device in the WDM passive optical network system in the present embodiment is as follows, when being connected main ring feeder fiber with this tangent rings point of contact distant-end node device and subring feeder fiber is all normal, 2 × 2 optical switches 2 will be placed in parallel connection status, break-make optical switch 13 disconnects, after downstream signal passes through 2 × 2 optical switches 2 and the first optical circulator 3 after arriving successively, three parts are divided into by power, referred to herein as signal U, signal V and signal W by the first optical coupler 8.Wherein, signal U by wavelength blocker WB11 filtering belong to main ring ONU after the wavelength signals that uses, after the 3rd optical coupler 10 and the 3rd optical circulator 5, enter subring feeder fiber and carry out downlink transfer along clockwise direction; Signal V is by being that parameter carries out shunt by array waveguide grating AWG21 with wavelength after the second optical circulator 4, signal along separate routes exports from corresponding port, corresponding light network element ONU23 is entered by profile fiber 22, by a part of signal being sent into light-receiving RX25 after optical coupler 24 partial wave in optical network unit ONU, another part light signal is admitted to reflective semiconductor optical amplifier RSOA26, and signal is wiped remodulates Hou Yanyuan road again by reflective semiconductor optical amplifier RSOA26 and got back to point of contact distant-end node RN
min 1, after passing through array waveguide grating AWG21, the second optical circulator 4, the 6th optical coupler 16, second optical coupler 9, first optical circulator 3 and 2 × 2 optical switch successively, 2 get back in main ring feeder fiber, carry out uplink in the counterclockwise direction; Signal W is by point of contact distant-end node RN
mget back to main ring feeder fiber after the 5th optical coupler 15 and 2 × 2 optical switch 2 in 1 and continue downlink transfer along clockwise direction.When main ring feeder fiber breaks down, distant-end node RN
m2 × 2 optical switches 2 in 1 will be placed in cross-connection state; all the other transmitting procedures do not change, and by the change of 2 × 2 optical switch 2 connection status, realize the change of main ring feeder fiber transmission direction; in time for Signal transmissions finds new path, realize the protection to system.When subring feeder fiber breaks down, break-make optical switch 13 closes, after signal A is belonged to the wavelength of main ring user use by first wave length block device WB11 filtering, more successively by entering subring feeder fiber after the 3rd optical coupler 10, break-make optical switch 13 and the 4th optical circulator 6.When main ring and subring feeder fiber all break down; 2 × 2 optical switches 2 will be placed in cross-connection state, and break-make optical switch 13 closes, and realize the change of signal in main ring feeder fiber and the transmission direction of subring feeder fiber; in time for Signal transmissions finds new path, realize the protection to system.
Embodiment three
In the present embodiment, the WDM passive optical network system at distant-end node device place as shown in Figure 5, this network system is made up of two tangent rings structures, and wherein main ring is connected M main ring distant-end node RN by two monomode fibers and main ring feeder fiber 41 with 51 by optical line terminal OLT 29
a31,32,34 and 35 formed, subring is by a distant-end node RN on main ring
m1 for point of contact is by two monomode fibers and subring feeder fiber 43 and 53 and N number of subring far-end node RN
b36,37,38,39 to be connected with 40 formation, each main ring distant-end node RN on main ring
aq optical network unit is respectively connected, each subring distant-end node RN in subring by profile fiber
bq optical network unit is respectively connected by profile fiber.
Distant-end node device in WDM passive optical network system in the present embodiment as shown in Figure 3, this device comprises 12 × 2 optical switch 2,41 × 2 optical switches 19,20,27,28,1 break-make optical switch 13,1 wavelength blocker WB11,2 Coarse Wave Division Multiplexer CWDM17,18,4 optical circulators 3,4,5,6,5 optical couplers, 8,10,14,15,16 and 11 × q array waveguide grating AWG21.On the left of first 1 × 2 optical switch 19, two ports connect outside and the inner fibers of main ring feeder fiber respectively, and right side port connects port above 2 × 2 optical switch 2 left sides; On the left of second 1 × 2 optical switch 20, two ports connect the inner side and outer side optical fiber of main ring feeder fiber respectively, and right side port connects port below 2 × 2 optical switch 2 left sides; On the left of 3rd 1 × 2 optical switch 27, port is connected with the second port of the 3rd optical circulator 5, and two, right side port connects outside and the inner fibers of subring feeder fiber respectively; On the left of 4th 1 × 2 optical switch 28, port is connected with the second port of the 4th optical circulator 6, and two, right side port connects subring feeder fiber inner side and outer side optical fiber respectively.Second port of the first optical circulator 3 is connected with above the right of 2 × 2 optical switches 2, first port of the first optical circulator 3 and the 3rd port are connected to the first Coarse Wave Division Multiplexer CWDM117 and the second Coarse Wave Division Multiplexer CWDM218 respectively, signal is divided into two-way by affiliated wave band by first wave division multiplexer 17, one tunnel is main ring transmission branch, another road is connected to the first optical coupler 8, signal is divided into two parts through the first optical coupler 8 by power, a part is subring transmission branch, and another part is optical network unit ONU transmission branch.Subring transmission branch comprises wavelength blocker WB11, second optical coupler 10, 3rd optical coupler 14, 5th optical coupler 16, second Coarse Wave Division Multiplexer CWDM218, 3rd optical circulator 5 and the 4th optical circulator 6, the input of the second optical coupler 10 is connected with an output of the first optical coupler 8 by wavelength blocker WB11, two outputs of the second optical coupler 10 are connected to the 3rd optical circulator 5 respectively and are connected to the first port of the 4th optical circulator 6 by break-make optical switch 13, second port of the 3rd optical circulator 5 and the 4th optical circulator 6 is connected to the left side port of the 3rd 1 × 2 optical switch 27 and the 4th 1 × 2 optical switch 28 respectively, break-make optical switch 13 is serially connected between the output of the second optical coupler 10 and the first port of the 4th optical circulator 6, 3rd port of the 3rd optical circulator 5 and the 4th optical circulator 6 is connected to two inputs of the 3rd optical coupler 14 respectively, and the first port of the first optical circulator 3 is connected to through the 5th optical coupler 16 and the second Coarse Wave Division Multiplexer CWDM218, optical network unit ONU transmission branch comprises the second optical circulator 4 and 11 × k array waveguide grating AWG21, first port of the second optical circulator 4 is connected with another output of the first optical coupler 8, second port of the second optical circulator 4 is connected with array waveguide grating AWG21, 3rd port of the second optical circulator 4 is connected with five optical coupler 16 inputs, the first port of the first optical circulator 3 is connected to through the second Coarse Wave Division Multiplexer CWDM218, array waveguide grating AWG21 connects q optical network unit ONU 23 by profile fiber 22, each optical network unit ONU comprises 1 optical coupler 24, 1 receiver RX25 and 1 reflective semiconductor optical amplifier RSOA26, in optical network unit ONU 23, signal is delivered in optical receiver RX25 and reflective semiconductor optical amplifier RSOA26 by optical coupler 24 by downstream signal respectively, main ring transmission branch comprises the 4th optical coupler 15 and the second Coarse Wave Division Multiplexer CWDM218, a port of the 4th optical coupler 15 is connected with another output of the first Coarse Wave Division Multiplexer CWDM117, and a port of the 4th optical coupler 15 is connected to main ring feeder fiber through 2 × 2 optical switch 2 and 1 × 2 optical switches 19,20.
The working method of the distant-end node device in the WDM passive optical network system in the present embodiment is as follows, when being connected main ring feeder fiber 41,51 with this distant-end node device and subring feeder fiber 43,53 is all normal, as shown in Figure 5.
In main ring, downstream signal transmission direction is clockwise direction:
OLT→RN
1→......→RN
m-1→RN
m→RN
m+1→......→RN
M
In main ring, uplink signal transmissions direction is counterclockwise:
RN
M→......→RN
m+1→RN
m→RN
m-1→......→RN
1→OLT
The transmission direction of subring downstream signal is clockwise direction:
OLT→RN
1→......→RN
m-1→RN
m→RN
*1→......→RN
*n-1→RN
*n→RN
*n+1→......→RN
*N
Subring uplink signal transmissions direction is counterclockwise:
RN
*N→......→RN
*n+1→RN
*n→RN
*n-1→......→RN
*1→RN
m→RN
m-1→......→RN
1→OLT
2 × 2 optical switches 2 will be placed in parallel connection status, break-make optical switch 13 disconnects, upper port after downstream signal arrives on the left of the one 1 × 2 optical switch 19 enters, successively by after 2 × 2 optical switch 2, first optical circulators 3 and the first Coarse Wave Division Multiplexer CWDM117, being pressed power from the signal of the first Coarse Wave Division Multiplexer CWDM117 upper port output by the first optical coupler 8 is two parts along separate routes, referred to herein as signal U and signal V.Wherein, signal U is by being that parameter carries out shunt by array waveguide grating AWG21 with wavelength after the second optical circulator 4, signal along separate routes exports from corresponding port, enter corresponding light network element ONU23, signal is by sending a part of signal into optical receiver RX25 after optical coupler 24 partial wave in optical network unit ONU 23, another part light signal is sent into reflective semiconductor optical amplifier RSOA26, and signal is wiped free of remodulates Hou Yanyuan road again and returns point of contact distant-end node RN
min 1, carry out uplink by getting back in main ring feeder fiber after the second optical circulator 4, the 5th optical coupler 16, second Coarse Wave Division Multiplexer CWDM218, the first optical circulator 3,2 × 2 optical switch the 2 and the one 1 × 2 optical switch 19 successively.Signal V by wavelength blocker WB11 filtering belong to main ring ONU after the wavelength signals that uses, after the second optical coupler 10, the 3rd optical circulator the 5 and the 31 × 2 optical switch 27, the outer fibers entering subring feeder fiber is transmitted along clockwise direction.The signal that first Coarse Wave Division Multiplexer CWDM117 lower right-hand side port exports, is called signal W here, and this part signal continues transmission downwards by getting back to after the 3rd optical coupler 15,2 × 2 optical switch the 2 and the 21 × 2 optical switch 20 in main ring feeder fiber.
There is fracture in the feeder fiber 41 when side in main ring, Signal transmissions between optical line terminal OLT 29 and main ring distal ends node has just been come by inner side feeder fiber 51, main ring is the same with transmission direction under normal circumstances with the transmission direction of subring, one 1 × 2 optical switch 19 pushes below, signal transmits along main ring inner fibers 51, and the lower port on the left of the one 1 × 2 optical switch 19 enters distant-end node RN
m1, distant-end node RN
mthe processing procedure of 1 pair of signal with the same under normal circumstances, no longer repeat specification here.All there is fracture in the feeder fiber 41 and 51 when both sides in main ring, the signal transmission direction now in main ring needs to change, to avoid signal along the Optical Fiber Transmission of fracture.
In main ring, downstream signal transmission direction is clockwise direction:
OLT→RN
1→......→RN
m-1→RN
m→RN
m+1→......→RN
M
In main ring, uplink signal transmissions direction is counterclockwise:
RN
M→......→RN
m+1→RN
m→RN
m-1→......→RN
1→OLT
Now point of contact distant-end node RN
min 1,2 × 2 optical switches 2 are placed in parallel connection status, and all the other transmitting procedures do not change, and realize the protection to system.
All there is fracture in two feeder fiber 41,51 when side in main ring, Signal transmissions between optical line terminal OLT 29 and main ring distal ends node just needs to change transmission direction have been come, the transmission direction of main ring and subring is all contrary with transmission direction under normal circumstances, and the lower port on the left of the 21 × 2 optical switch 20 enters distant-end node RN
m1, distant-end node RN
mthe processing procedure of 1 pair of signal with similar under normal circumstances, no longer repeat specification here.All there is fracture in two feeder fiber 41 and 51 when side in main ring, the signal transmission direction now in main ring needs to change, to avoid signal along the Optical Fiber Transmission of fracture.
In main ring, downstream signal transmission direction is counterclockwise:
OLT→RN
M→......→RN
m+1→RN
m→RN
m-1→......→RN
1
In main ring, uplink signal transmissions direction is clockwise direction:
RN
1→......→RN
m-1→RN
m→RN
m+1→......→RN
M→OLT
Now point of contact distant-end node RN
min 1,2 × 2 optical switches 2 are placed in cross-connection state, and all the other transmitting procedures do not change, and by the change of 2 × 2 optical switch 2 connection status, realize the change of main ring feeder fiber transmission direction, in time for Signal transmissions finds new path, realize the protection to system.
In like manner when point of contact distant-end node RN appears fracture, in subring feeder line outer fibers 43
msignal transmissions between 1 and each subring distant-end node has just been come by inner side feeder fiber 53, main ring is the same with transmission direction under normal circumstances with the transmission direction of subring, 31 × 2 optical switch 27 pushes below, signal transmits along subring inner fibers 53, and the upper port on the left of the one 1 × 2 optical switch 19 enters distant-end node RN
m1, distant-end node RN
mthe processing procedure of 1 pair of signal with the same under normal circumstances, no longer repeat specification here.All there is fracture in the feeder fiber 43 and 53 when both sides in subring, the signal transmission direction now in subring needs to change, to avoid the Optical Fiber Transmission along fracture.
The transmission direction of subring downstream signal is counterclockwise:
OLT→RN
1→......→RN
m-1→RN
m→RN
*N→......→RN
*n+1→RN
*n→RN
*n-1→......→RN
*1
Subring uplink signal transmissions direction is clockwise direction:
RN
*1→......→RN
*n-1→RN
*n→RN
*n+1→......→RN
*N→RN
m→RN
m-1→......→RN
1→OLT
Now point of contact distant-end node RN
min 1, break-make optical switch 13 closes, and all the other transmitting procedures do not change, and by the change of break-make optical switch 13 state, realize the change of subring feeder fiber transmission direction, in time for Signal transmissions finds new path, realizes the protection to system.
Therefore tangent rings point of contact distant-end node RN of the present invention
m1 realizes signal by the combination of 2 × 2 optical switch 2 connection status, break-make optical switch 13 and optical circulator arrives each main ring and subring distant-end node at main ring and subring along clockwise or counterclockwise transmission, thus realizes the protection of network node at different levels and the expansion of network size.
Claims (8)
1. the tangent rings point of contact distant-end node device in a WDM passive optical network system, it is characterized in that, this point of contact distant-end node device includes light distributor for light signal being divided into three tunnels and the array waveguide grating AWG being used for being connected with optical network unit ONU, the input of described light distributor is connected to main ring optical fiber by optical switch, described light distributor output is connected with array waveguide grating AWG, two other output by corresponding optical circulator or optical coupler respectively with main ring optical fiber and subring Fiber connection.
2. the tangent rings point of contact distant-end node device in WDM passive optical network system according to claim 1, it is characterized in that, in three outputs of described light distributor, at least one exports on branch road and is provided with wavelength resistance block device, does not belong to the signal of wavelength needed for this road for filtering.
3. the tangent rings point of contact distant-end node device in WDM passive optical network system according to claim 2, it is characterized in that, transmission branch between described light distributor and subring optical fiber is provided with two optical circulators arranged side by side, first port of described two optical circulators arranged side by side all passes through the second optical coupler and is connected with the output of light distributor, second port is all connected to subring optical fiber respectively by corresponding optical switch, is serially connected with break-make optical switch between the first port of one of them optical circulator and the second optical coupler.
4. the tangent rings point of contact distant-end node device in WDM passive optical network system according to claim 3, it is characterized in that, the second optical circulator is provided with between described first optical coupler and array waveguide grating AWG, first port of this second optical circulator is connected with the output of the first optical coupler, and the second port of optical circulator is connected with array waveguide grating AWG.
5. according to the tangent rings point of contact distant-end node device in the WDM passive optical network system in claim 1-4 described in any one, it is characterized in that, described light distributor is the first optical coupler, and the input of the first optical coupler is connected to optical switch by the first optical circulator.
6. according to the tangent rings point of contact distant-end node device in the WDM passive optical network system in claim 1-4 described in any one, it is characterized in that, described light distributor comprises the first Coarse Wave Division Multiplexer CWDM and the first optical coupler, the input of the first Coarse Wave Division Multiplexer CWDM is connected to optical switch by the first optical circulator, light signal is divided into two-way by affiliated wave band, one tunnel is used for and main ring Fiber connection, another road is connected to the first optical coupler, first optical coupler is divided into two-way by power, one tunnel is connected with array waveguide grating AWG, another road is used for being connected to subring optical fiber.
7. the tangent rings point of contact distant-end node device in WDM passive optical network system according to claim 5, it is characterized in that, the described output branch road be connected with main ring optical fiber is provided with the 3rd optical circulator, first port of this optical circulator is connected with the output of the first optical coupler, and the second port is connected to main ring optical fiber by optical switch.
8. the tangent rings point of contact distant-end node device in WDM passive optical network system according to claim 6, output branch road between described first Coarse Wave Division Multiplexer CWDM and main ring optical fiber is provided with the 3rd optical coupler, the input of the 3rd optical coupler is connected with the output of the first Coarse Wave Division Multiplexer CWDM, and the output of the 3rd optical coupler is by optical switch and main ring Fiber connection.
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