CN104836624A - Centralized protection passive optical network system based on optical carrier suppression technology - Google Patents
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Abstract
The invention discloses a centralized protection passive optical network system based on an optical carrier suppression technology. The centralized protection passive optical network system comprises an optical line terminal, working feed-in fibers, protection feed-in fibers, a far-end node, N working distributed fibers, N protection distributed fibers and N optical network units. The optical line terminal comprises a carrier suppression double-sideband signal transmitter, a first comb filter, a 1*2 optical switch, a first array waveguide grating, an upper link and down link data transceiver, a second array waveguide grating, an erbium doped fiber amplifier, a second comb filter and a monitoring and control unit. The far-end node comprises a third array waveguide grating and a fourth array waveguide grating. Each optical network unit comprises a 2*2 optical coupler, a down link receiver and a reflective semiconductor optical amplifier.
Description
Technical field
The invention belongs to technical field of optical fiber communication, relate to a kind of centralized protection passive optical network based on optical carrier suppression modulation technique.
Background technology
In recent years, Wave division multiplexing passive optical network (wavelength-division-multiplexed passive opticalnetwork, WDM-PON) technology is acknowledged as a kind of emerging Future broadband access technology, and it can provide higher bandwidth capacity, larger coverage, preferably service quality, flexibly and effectively upgrading and allocation plan etc.Along with in WDM-PON, unique user transmission rate constantly reaches 1Gbit/s, 10Gbit/s, even higher time, any feed-in optical fiber or the fault of profile fiber all can cause googol according to loss.Therefore, how improving network survivability own through becoming the problem of an extensive discussions in WDM-PON system, even if in some not expected situations, as fire or earthquake, transmitting the basic demand that data also become current network highly reliably.
For PON application, OLT (Optical Line Terminal) or ONU (Optical Network Unit) equipment fault can be repaired by simple device backup.But link failure but will take a long time to repair.Therefore, people extremely wish to adopt certain protection handover mechanism to prevent link failure, promote the survivability of WDM-PON system.Different according to the position at monitor and forecast unit (Monitoring and Control Unit, MCU) place, be divided into two kinds of protection mechanisms: distributed AC servo system protection and centerized fusion protection.The protection mechanism that monitor and forecast unit (MCU) and optical switch (Optical Switch, OS) are positioned at optical network unit (ONU) is distributed AC servo system protection; The protection mechanism that monitor and forecast unit and optical switch are positioned at optical line terminal (OLT) is centerized fusion protection, and what the present invention adopted is centerized fusion protection.
Through finding existing literature search, the people such as Arshad Chowdhury and Ming-Fang Huang have delivered and have been entitled as " A Self-Survivable WDM-PONArchitecture with CentralizedWavelength Monitoring on " OFC2008Optical Fiber Communication Conference and Exposition (U.S.'s optical communication meeting) ", (one has centralized wavelength monitor to Protection and Restoration forboth Upstream and Downstream Links, protection and the WDM-PON Self-Protection Subsystem of repair function) " article, this article proposes by optical carrier suppression (Optical Carrier Suppression, OCS) modulation technique, produce two subcarriers, be respectively used to downstream transmission.Each group containing two subcarriers " wavelength to " is divided into two parts through an optical branching device power again, is connected respectively in two different network element controllers (Network Unit Control, NUC).When an optical fiber link fault being detected, the state of corresponding NUC switches light switch, AWG re-routes affected transfer of data on another Protection path.Because upper line light source is provided by the OCS unit of local side, each ONU keeps decolorizable.In this protection mechanism, the subcarrier that OCS modulating unit produces only for downstream transmission, but not for backup protection.Although this system schema adopts the automatic protection switching of centerized fusion; but because employing 2N optical comb filter (Interleaver; IL), N number of optical switch and N number of network control unit (NUC), significantly increase complexity and the cost of system.
Find through retrieval again, the people such as Yang Qiu and Zhi xin Liu have delivered the article being entitled as " ACentrally Controlled Survivable WDM-PONBased on Optical Carrier Suppression Technique (a kind of protection of the centerized fusion based on optical carrier suppression technology WDM-PON system) " in " Photonics TechnologyLetters (the Photonics Technology communication) " of 2011, this article proposes and uses electric switch to control unlatching or the closedown of clock signal at optical line terminal (OLT), by optical carrier suppression (OCS) technology, produce the optical sub-carrier of transmission on Protection path.When working optical fibre link failure; clock signal is opened, and produce the double-sideband signal of optical carrier suppression, wherein upper side band signal is through optical comb filter; be routed on backup protection optical fiber and transmit, lower sideband signal is directly abandoned by array waveguide grating filtering.But owing to being subject to the restriction of array waveguide grating Wavelength grid width, the clock signal of this system at least wants 25GHz, and needs to install N number of electric switch and N number of MCUs at OLT end, this adds increased complexity and the cost of system.
Summary of the invention
Technical problem: the object of the invention is to for the deficiencies in the prior art; propose a kind of complexity and the cost that significantly reduce system, to the protection of the centerized fusion based on the optical carrier suppression modulation technique passive optical network that work feed-in optical fiber and work distribution type fiber-optic can be protected.
Technical scheme: the centralized protection passive optical network based on optical carrier suppression modulation technique of the present invention, comprise: optical line terminal, work feed-in optical fiber, protection feed-in optical fiber, distant-end node, N bar work distribution type fiber-optic, N bar protection distribution type fiber-optic and N number of optical network unit, wherein: one end of described optical line terminal and work feed-in optical fiber and protect one end of feed-in optical fiber to be connected respectively, the other end of work feed-in optical fiber is connected with distant-end node with the other end of protection feed-in optical fiber, respectively with transmitting downlink data; Described distant-end node with work distribution type fiber-optic one end and protect one end of distribution type fiber-optic to be connected respectively, the other end of work distribution type fiber-optic and protect the other end of distribution type fiber-optic to be connected with optical network unit respectively, with by downlink data transmission to each optical network unit; Described optical network unit is used for the reception of downlink data, and carries out remodulates to descending light carrier, is transferred to distant-end node carries out transmitting uplink data through work distribution type fiber-optic and protection distribution type fiber-optic.
In preferred version of the present invention, optical line terminal is used for the transmitting of downlink data and the reception of upstream data, comprise the Double Sideband Suppressed Carrier signal transmitter connected successively, first comb filter, 1 × 2 optical switch, first array waveguide grating, up-downgoing data transceiver, second array waveguide grating, erbium-doped fiber amplifier, second comb filter, and the monitor and forecast unit to be connected with described 1 × 2 optical switch and up-downgoing data transceiver, wherein: the output port of described Double Sideband Suppressed Carrier signal transmitter is connected with the multiplexing input port of the first comb filter, the demultiplexed output ports of the first comb filter is connected with the first port of 1 × 2 optical switch and the second port respectively, 3rd port of 1 × 2 optical switch is connected with the multiplexing input port of the first array waveguide grating, the demultiplexed output ports of the first array waveguide grating is corresponding with the input port of up-downgoing data transceiver to be connected, with transmitting downlink data, N number of up-downgoing data transmit-receive module in up-downgoing data transceiver is corresponding with the demultiplexing input port of the second array waveguide grating respectively to be connected, to transmit N road downlink data, the multiplexed output ports of the second array waveguide grating is connected with the input port of erbium-doped fiber amplifier, to amplify single-side belt downlink data signal, the output port of erbium-doped fiber amplifier is connected with the multiplexing input port of the second comb filter, demultiplexed output ports and the work feed-in Fiber connection of the second comb filter, in order to upper side band signal to be routed to work feed-in optical fiber, the demultiplexed output ports of the second comb filter also with protection feed-in Fiber connection, in order to lower sideband signal to be routed to protection feed-in optical fiber.
In preferred version of the present invention, distant-end node comprises: the 3rd array waveguide grating and the 4th array waveguide grating, wherein: the multiplexing port of described 3rd array waveguide grating is connected with work feed-in line optical fiber, N number of demultiplexing port and the N article of work distribution type fiber-optic of the 3rd array waveguide grating connect one to one, in order to the upper side band wave decomposition multiplex signal of transmitting downlink data; The multiplexing port of described 4th array waveguide grating is connected with protection feed-in line optical fiber, and N number of demultiplexing port of the 4th array waveguide grating and N article protect distribution type fiber-optic to connect one to one, in order to the lower sideband Wave Decomposition multiplexed signals of transmitting downlink data; Described work distribution type fiber-optic and protection distribution type fiber-optic are simultaneously in order to the up remodulates Signal transmissions that returned by the optical network unit demultiplexing port to the 3rd array waveguide grating and the 4th array waveguide grating.
In preferred version of the present invention; optical network unit comprises: 2 × 2 optical couplers, downlink receiver and reflective semiconductor optical amplifier; wherein: an input port of described 2 × 2 optical couplers is connected with work distribution type fiber-optic; another input port is connected with protection distribution type fiber-optic; an output port of 2 × 2 optical couplers is connected with reflective semiconductor optical amplifier, and another output port is connected with downlink receiver.
In preferred version of the present invention, Double Sideband Suppressed Carrier signal transmitter comprises: multi wave length illuminating source, Mach zehnder modulators and radio-frequency signal generator, wherein: the light source output port of multi wave length illuminating source is connected with the input port of Mach zehnder modulators, the output port of Mach zehnder modulators connects the multiplexing port of the first comb filter, to be separated upper sideband light carrier and lower sideband light carrier, the RF signal output mouth of radio-frequency signal generator is connected with the modulation control port of Mach zehnder modulators;
In preferred version of the present invention, up-downgoing data transceiver comprises N number of up-downgoing data transmit-receive module, wherein each up-downgoing data transmit-receive module comprises: Mach zehnder modulators, downlink data generator, optical circulator, uplink receiver and up optical power detector, wherein: the light carrier input port of Mach zehnder modulators connects with the first corresponding array waveguide grating demultiplexed output ports, for transmitting descending single-side belt light carrier, the output port of downlink data generator is connected with the downlink data input port of Mach zehnder modulators, the delivery outlet of Mach zehnder modulators connects the first port of optical circulator, the demultiplexing input port that second port of optical circulator is corresponding with the second array waveguide grating connects, for transmitting downlink data signal, 3rd port of optical circulator is connected with the data-in port of uplink receiver, for the reception of upstream data, the uplink optical signal input port of up optical power detector is connected with the data-out port of uplink receiver, the upward signal luminous power on monitoring fiber path,
In preferred version of the present invention, monitor and forecast unit is realized by logic sum gate, the monitor signal output port of the up optical power detector in N number of up-downgoing data transmit-receive module is corresponding with the input port of logic sum gate to be connected, and the output port of logic sum gate is connected with the control port of 1 × 2 optical switch.
Monitor and forecast unit in present system, upward signal luminous power on up optical power detector monitoring N bar working fiber paths in N number of up-downgoing data transmit-receive module, once monitor significantly power drop, optical power detector device produces a link state monitoring signal of telecommunication accordingly, and sends to logic sum gate to judge; Logic sum gate transmitting optical switch control signal controls optical switch, carries out switch protecting operation.
The present invention, by optical carrier suppression (OCS) modulation technique, produces two subcarriers and is respectively used to working fiber paths and protection fiber path.When working optical fibre link failure being detected, the state of switches light switch, affected transfer of data route to protection fiber path.Each optical network unit uplink is based on reflective semiconductor optical amplifier, and each ONU keeps decolorizable.The present invention only needs an optical switch, a monitor and forecast unit (MCU), the reflective semiconductor optical amplifier at ONU place is used for the remodulates of upstream data, achieve the decolorizable of ONU, avoid using arbitrary source, just achieve optical fiber link failure monitoring, significantly reduce complexity and the cost of system.In addition, the present invention can protect work feed-in optical fiber and work distribution type fiber-optic.
Beneficial effect: compared with prior art, the present invention has the following advantages:
1) automatic protected switch system of existing a kind of centerized fusion, employ 2N optical comb filter (Interleaver, IL), N number of optical switch and N number of monitor and forecast unit (MCU), significantly increase complexity and the cost of system; Optical line terminal of the present invention (OLT) place only uses an optical switch and a monitor and forecast unit, compared with existing technical scheme, greatly reduces, reduce complexity and the cost of system in the number of devices that network protection switches.
2) optical network unit (ONU) of existing centralized protection system generally locks F-P laser by optical coupler, wavelength division multiplexer (WDM) and seeded wavelength, achieve the decolorizable of ONU, but, the remodulates of seeded wavelength locking F-P laser needs high input power, for the system of high bit rate, seeded wavelength locking F-P laser will be restricted; Each optical network unit of the present invention only uses an optical coupler, a reflective semiconductor optical amplifier, without any need for wave-division multiplexer filter, wherein, reflective semiconductor optical amplifier is used for the remodulates of upstream data, not only simplify the structure of ONU, also achieve the decolorizable use simultaneously avoiding arbitrary source of ONU, reduce complexity and the cost of equipment.
3) feed-in optical fiber and distribution type fiber-optic can be protected, and improve the reliability of system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is feed-in optical fiber and distribution type fiber-optic link failure protection schematic diagram in embodiment;
Fig. 3 is optical switch experimental result switching time in embodiment;
Fig. 4 is the spectrogram tested in embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the centralized protection passive optical network based on optical carrier suppression modulation technique provided in the present embodiment, comprise: optical line terminal, work feed-in optical fiber, protection feed-in optical fiber, distant-end node, N bar work distribution type fiber-optic, N bar protection distribution type fiber-optic and N number of optical network unit, wherein: one end of described optical line terminal and work feed-in optical fiber and protect one end of feed-in optical fiber to be connected respectively, the other end of work feed-in optical fiber is connected with distant-end node with the other end of protection feed-in optical fiber, respectively with transmitting downlink data; Described distant-end node with work distribution type fiber-optic one end and protect one end of distribution type fiber-optic to be connected respectively, the other end of work distribution type fiber-optic and protect the other end of distribution type fiber-optic to be connected with optical network unit respectively, with by downlink data transmission to each optical network unit; Described optical network unit is used for the reception of downlink data, and carries out remodulates to descending light carrier, is transferred to distant-end node carries out transmitting uplink data through work distribution type fiber-optic and protection distribution type fiber-optic.
In preferred version of the present invention, optical line terminal is used for the transmitting of downlink data and the reception of upstream data, comprise the Double Sideband Suppressed Carrier signal transmitter connected successively, first comb filter, 1 × 2 optical switch, first array waveguide grating, up-downgoing data transceiver, second array waveguide grating, erbium-doped fiber amplifier, second comb filter, and the monitor and forecast unit to be connected with described 1 × 2 optical switch and up-downgoing data transceiver, wherein: the output port of described Double Sideband Suppressed Carrier signal transmitter is connected with the multiplexing input port of the first comb filter, the demultiplexed output ports of the first comb filter is connected with the first port of 1 × 2 optical switch and the second port respectively, 3rd port of 1 × 2 optical switch is connected with the multiplexing input port of the first array waveguide grating, the demultiplexed output ports of the first array waveguide grating is corresponding with the input port of up-downgoing data transceiver to be connected, with transmitting downlink data, N number of up-downgoing data transmit-receive module in up-downgoing data transceiver is corresponding with the demultiplexing input port of the second array waveguide grating respectively to be connected, to transmit N road downlink data, the multiplexed output ports of the second array waveguide grating is connected with the input port of erbium-doped fiber amplifier, to amplify single-side belt downlink data signal, the output port of erbium-doped fiber amplifier is connected with the multiplexing input port of the second comb filter, demultiplexed output ports and the work feed-in Fiber connection of the second comb filter, in order to upper side band signal to be routed to work feed-in optical fiber, the demultiplexed output ports of the second comb filter also with protection feed-in Fiber connection, in order to lower sideband signal to be routed to protection feed-in optical fiber.
In preferred version of the present invention, distant-end node comprises: the 3rd array waveguide grating and the 4th array waveguide grating, wherein: the multiplexing port of described 3rd array waveguide grating is connected with work feed-in line optical fiber, N number of demultiplexing port and the N article of work distribution type fiber-optic of the 3rd array waveguide grating connect one to one, in order to the upper side band wave decomposition multiplex signal of transmitting downlink data; The multiplexing port of described 4th array waveguide grating is connected with protection feed-in line optical fiber, and N number of demultiplexing port of the 4th array waveguide grating and N article protect distribution type fiber-optic to connect one to one, in order to the lower sideband Wave Decomposition multiplexed signals of transmitting downlink data; Described work distribution type fiber-optic and protection distribution type fiber-optic are simultaneously in order to the up remodulates Signal transmissions that returned by the optical network unit demultiplexing port to the 3rd array waveguide grating and the 4th array waveguide grating.
In preferred version of the present invention; optical network unit comprises: 2 × 2 optical couplers, downlink receiver and reflective semiconductor optical amplifier; wherein: an input port of described 2 × 2 optical couplers is connected with work distribution type fiber-optic; another input port is connected with protection distribution type fiber-optic; an output port of 2 × 2 optical couplers is connected with reflective semiconductor optical amplifier, and another output port is connected with downlink receiver.
In preferred version of the present invention, Double Sideband Suppressed Carrier signal transmitter comprises: multi wave length illuminating source, Mach zehnder modulators and radio-frequency signal generator, wherein: the light source output port of multi wave length illuminating source is connected with the input port of Mach zehnder modulators, the output port of Mach zehnder modulators connects the multiplexing port of the first comb filter, to be separated upper sideband light carrier and lower sideband light carrier, the RF signal output mouth of radio-frequency signal generator is connected with the modulation control port of Mach zehnder modulators;
In preferred version of the present invention, up-downgoing data transceiver comprises N number of up-downgoing data transmit-receive module, wherein each up-downgoing data transmit-receive module comprises: Mach zehnder modulators, downlink data generator, optical circulator, uplink receiver and up optical power detector, wherein: the light carrier input port of Mach zehnder modulators connects with the first corresponding array waveguide grating demultiplexed output ports, for transmitting descending single-side belt light carrier, the output port of downlink data generator is connected with the downlink data input port of Mach zehnder modulators, the delivery outlet of Mach zehnder modulators connects the first port of optical circulator, the demultiplexing input port that second port of optical circulator is corresponding with the second array waveguide grating connects, for transmitting downlink data signal, 3rd port of optical circulator is connected with the data-in port of uplink receiver, for the reception of upstream data, the uplink optical signal input port of up optical power detector is connected with the data-out port of uplink receiver, the upward signal luminous power on monitoring fiber path,
In preferred version of the present invention, monitor and forecast unit is realized by logic sum gate, the monitor signal output port of the up optical power detector in N number of up-downgoing data transmit-receive module is corresponding with the input port of logic sum gate to be connected, and the output port of logic sum gate is connected with the control port of 1 × 2 optical switch.
Monitor and forecast unit in present system, upward signal luminous power on up optical power detector monitoring N bar working fiber paths in N number of up-downgoing data transmit-receive module, once monitor significantly power drop, optical power detector device produces a link state monitoring signal of telecommunication accordingly, and sends to logic sum gate to judge; Logic sum gate transmitting optical switch control signal controls optical switch, carries out switch protecting operation.
The present invention, by optical carrier suppression (OCS) modulation technique, produces two subcarriers and is respectively used to working fiber paths and protection fiber path.When working optical fibre link failure being detected, the state of switches light switch, affected transfer of data route to protection fiber path.Each optical network unit uplink is based on reflective semiconductor optical amplifier, and each ONU keeps decolorizable.The present invention only needs an optical switch, a monitor and forecast unit (MCU), just achieves optical fiber link failure monitoring, significantly reduces complexity and the cost of system.In addition, the present invention can protect work feed-in optical fiber and work distribution type fiber-optic.
Schematic diagram is protected as shown in Figure 2 for feed-in optical fiber and distribution type fiber-optic link failure in the present embodiment, comprise: optical line terminal 4, work feed-in optical fiber 28, protection feed-in optical fiber 29, distant-end node 5, N bar work distribution type fiber-optic 32, N bar protection distribution type fiber-optic 33 and N number of optical network unit 6, optical line terminal 4 comprises: Double Sideband Suppressed Carrier signal transmitter 11, 1 × 2 optical switch 38, first comb filter 10, first array waveguide grating 12, up-downgoing data transceiver 18, second array waveguide grating 23, erbium-doped fiber amplifier 24, second comb filter 25 and monitor and forecast unit 37, distant-end node 5 comprises: the 3rd array waveguide grating 30 and the 4th array waveguide grating 31, optical network unit 6 comprises: downlink receiver 34,2 × 2 optical coupler 36 and reflective semiconductor optical amplifier 35, Double Sideband Suppressed Carrier signal transmitter 11 comprises: multi wave length illuminating source 7, Mach zehnder modulators 8, radio-frequency signal generator 9, up-downgoing data transceiver 18 comprises: Mach zehnder modulators 14, optical circulator 21 and uplink receiver 16, downlink data generator 15, monitor and forecast unit 37 comprises: optical power monitor 17, logic sum gate 20, wherein, the light carrier that multi wave length illuminating source produces N number of different wave length enters a Mach zehnder modulators, produces the optical carrier suppression double-side band light carrier (as shown in the spectrogram of Fig. 4 (a) experiment test) of N number of different wave length under radio frequency signals drive, the N that Double Sideband Suppressed Carrier signal transmitter produces is separated into N number of upper sideband light carrier and N number of lower sideband light carrier to optical carrier suppression double-side band light carrier through the first comb filter, the two-way single-side belt light carrier that first comb filter exports is connected respectively to the first port and second port of 1 × 2 optical switch, the optical fiber link lower optical switch that normally works selects N number of upper sideband light carrier, the multiplexing port of the first array waveguide grating is outputted to from the 3rd port of optical switch, enter up-downgoing data transceiver through the first array waveguide grating demultiplexed output ports and carry out modulate downstream data, optical switch selects certain road single-side belt light carrier by monitor and forecast unit controls, N number of up-downgoing data transmit-receive module in up-downgoing data transceiver produces N road downlink data signal and is connected with the multiplexing input port of the homographic solution of the second array waveguide grating, transmission N road downlink data, the multiplexed output ports of the second array waveguide grating connects erbium-doped fiber amplifier to amplify single-side belt downlink data signal, the output port of erbium-doped fiber amplifier is connected with the second comb filter, for route upper side band signal (as shown in the spectrogram of Fig. 4 (b) experiment test) and lower sideband signal (as shown in the spectrogram of Fig. 4 (c) experiment test) transmit to work feed-in optical fiber and protection feed-in optical fiber respectively, part downlink data enters downlink receiver and carries out demodulation, another part light signal enters reflective semiconductor optical amplifier and carries out remodulates upstream data, and optical network unit is used for the reception of downlink data and the transmitting of up remodulates data, uplink receiver in N number of up-downgoing data transmit-receive module connects, for the reception (as shown in the spectrogram of Fig. 4 (d) experiment test) of upstream data, upward signal luminous power on optical power detector monitoring N bar working fiber paths, once monitor significantly power drop (as shown in Figure 2 feed-in optical fiber and distribution type fiber-optic link failure protection schematic diagram), optical power detector produces a link state monitoring signal of telecommunication accordingly, and send to logic sum gate to judge, logic sum gate transmitting optical switch control signal controls optical switch, carry out switch protecting operation, optical switch is selected to switch N number of lower sideband light carrier, descending data enter optical network unit through overprotection feed-in optical fiber and protection distribution type fiber-optic, the transfer of data of user is not affected when such optical fiber link or distribution type fiber-optic link failure, Fig. 3 is optical switch experimental result switching time, learn that time that optical switch switches very shortly is about 1ms from experimental result, very little to the up-downgoing service impact of all ONU.
Above-described embodiment is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention; some improvement and equivalent replacement can also be made; these improve the claims in the present invention and are equal to the technical scheme after replacing, and all fall into protection scope of the present invention.
Claims (7)
1. the centralized protection passive optical network based on optical carrier suppression modulation technique, it is characterized in that, this system comprises: optical line terminal, work feed-in optical fiber, protection feed-in optical fiber, distant-end node, N bar work distribution type fiber-optic, N bar protection distribution type fiber-optic and N number of optical network unit, wherein: one end of described optical line terminal and work feed-in optical fiber and protect one end of feed-in optical fiber to be connected respectively, the other end of work feed-in optical fiber is connected with distant-end node with the other end of protection feed-in optical fiber, respectively with transmitting downlink data; Described distant-end node with work distribution type fiber-optic one end and protect one end of distribution type fiber-optic to be connected respectively, the other end of work distribution type fiber-optic and protect the other end of distribution type fiber-optic to be connected with optical network unit respectively, with by downlink data transmission to each optical network unit; Described optical network unit is used for the reception of downlink data, and carries out remodulates to descending light carrier, is transferred to distant-end node carries out transmitting uplink data through work distribution type fiber-optic and protection distribution type fiber-optic.
2. the centralized protection passive optical network based on optical carrier suppression modulation technique according to claim 1, it is characterized in that, described optical line terminal is used for the transmitting of downlink data and the reception of upstream data, comprise the Double Sideband Suppressed Carrier signal transmitter connected successively, first comb filter, 1 × 2 optical switch, first array waveguide grating, up-downgoing data transceiver, second array waveguide grating, erbium-doped fiber amplifier, second comb filter, and the monitor and forecast unit to be connected with described 1 × 2 optical switch and up-downgoing data transceiver, wherein: the output port of described Double Sideband Suppressed Carrier signal transmitter is connected with the multiplexing input port of the first comb filter, the demultiplexed output ports of the first comb filter is connected with the first port of 1 × 2 optical switch and the second port respectively, 3rd port of 1 × 2 optical switch is connected with the multiplexing input port of the first array waveguide grating, the demultiplexed output ports of the first array waveguide grating is corresponding with the input port of up-downgoing data transceiver to be connected, with transmitting downlink data, N number of up-downgoing data transmit-receive module in up-downgoing data transceiver is corresponding with the demultiplexing input port of the second array waveguide grating respectively to be connected, to transmit N road downlink data, the multiplexed output ports of the second array waveguide grating is connected with the input port of erbium-doped fiber amplifier, to amplify single-side belt downlink data signal, the output port of erbium-doped fiber amplifier is connected with the multiplexing input port of the second comb filter, demultiplexed output ports and the work feed-in Fiber connection of the second comb filter, in order to upper side band signal to be routed to work feed-in optical fiber, the demultiplexed output ports of the second comb filter also with protection feed-in Fiber connection, in order to lower sideband signal to be routed to protection feed-in optical fiber.
3. the centralized protection passive optical network based on optical carrier suppression modulation technique according to claim 1 and 2, it is characterized in that, described distant-end node comprises: the 3rd array waveguide grating and the 4th array waveguide grating, wherein: the multiplexing port of described 3rd array waveguide grating is connected with work feed-in line optical fiber, N number of demultiplexing port and the N article of work distribution type fiber-optic of the 3rd array waveguide grating connect one to one, in order to the upper side band wave decomposition multiplex signal of transmitting downlink data; The multiplexing port of described 4th array waveguide grating is connected with protection feed-in line optical fiber, and N number of demultiplexing port of the 4th array waveguide grating and N article protect distribution type fiber-optic to connect one to one, in order to the lower sideband Wave Decomposition multiplexed signals of transmitting downlink data; Described work distribution type fiber-optic and protection distribution type fiber-optic are simultaneously in order to the up remodulates Signal transmissions that returned by the optical network unit demultiplexing port to the 3rd array waveguide grating and the 4th array waveguide grating.
4. the centralized protection passive optical network based on optical carrier suppression modulation technique according to claim 1 and 2; it is characterized in that; described optical network unit comprises: 2 × 2 optical couplers, downlink receiver and reflective semiconductor optical amplifier; wherein: an input port of described 2 × 2 optical couplers is connected with work distribution type fiber-optic; another input port is connected with protection distribution type fiber-optic; an output port of 2 × 2 optical couplers is connected with reflective semiconductor optical amplifier, and another output port is connected with downlink receiver.
5. the centralized protection passive optical network based on optical carrier suppression modulation technique according to claim 2, it is characterized in that, described Double Sideband Suppressed Carrier signal transmitter comprises: multi wave length illuminating source, Mach zehnder modulators and radio-frequency signal generator, wherein: the light source output port of multi wave length illuminating source is connected with the input port of Mach zehnder modulators, the output port of Mach zehnder modulators connects the multiplexing port of the first comb filter, to be separated upper sideband light carrier and lower sideband light carrier, the RF signal output mouth of radio-frequency signal generator is connected with the modulation control port of Mach zehnder modulators.
6. according to claim 2 based on the centralized protection passive optical network of optical carrier suppression modulation technique, it is characterized in that, described up-downgoing data transceiver comprises N number of up-downgoing data transmit-receive module, wherein each up-downgoing data transmit-receive module comprises: Mach zehnder modulators, downlink data generator, optical circulator, uplink receiver and up optical power detector, wherein: the light carrier input port of Mach zehnder modulators connects with the first corresponding array waveguide grating demultiplexed output ports, for transmitting descending single-side belt light carrier, the output port of downlink data generator is connected with the downlink data input port of Mach zehnder modulators, the delivery outlet of Mach zehnder modulators connects the first port of optical circulator, the demultiplexing input port that second port of optical circulator is corresponding with the second array waveguide grating connects, for transmitting downlink data signal, 3rd port of optical circulator is connected with the data-in port of uplink receiver, for the reception of upstream data, the uplink optical signal input port of up optical power detector is connected with the data-out port of uplink receiver, the upward signal luminous power on monitoring fiber path.
7. the centralized protection passive optical network based on optical carrier suppression modulation technique according to claim 2; it is characterized in that; described monitor and forecast unit is realized by logic sum gate; the monitor signal output port of the up optical power detector in N number of up-downgoing data transmit-receive module is corresponding with the input port of logic sum gate to be connected, and the output port of logic sum gate is connected with the control port of 1 × 2 optical switch.
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