CN101860399B - Passive optical network system fusing wireless and full optical virtual private network services - Google Patents
Passive optical network system fusing wireless and full optical virtual private network services Download PDFInfo
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Abstract
The invention relates to a passive optical network system fusing wireless and full optical virtual private network services, belonging to the communication technical field. The invention comprises an optical line terminal, a far-end node, an arrayed waveguide grating and an optical network unit, wherein the optical line terminal comprises a downgoing signal transmitter, two circulators, an optical receiver, an optical coupler, a dual-direction optical amplifier, a Mach-Zehnder modulator, a radio-frequency signal generator and a direct power supply. The optical network unit comprises two circulators, two optical Bragg gratings, a downgoing data receiver, a full optical virtual private network data receiver, a Mach-Zehnder modulator and two pulse-pattern generators. The invention fuses a broadband wireless access network, a passive optical network technology and a full optical virtual private network technology and realizes wire transmission and wireless transmission for downgoing data and full optical virtual network data for the first time. The optical carrier in the downgoing signal is used by the optical network unit end as the carrier of upgoing data and full optical virtual private network data so as to save cost of the optical network unit.
Description
Technical field
What the present invention relates to is a kind of system of technical field of optical fiber communication, specifically is the passive optical network of a kind of fusing wireless and full optical virtual private network service.
Background technology
Passive optical network (PON) utilizes existing low-cost device, and is simple in structure and with low cost, become the preferred version that the user realizes broadband access.In the last few years, utilized the passive optical network technology of wavelength division multiplexing (WDM) slowly to rise.In this passive optical network, each user is assigned to a pair of certain wavelengths, can communicate by letter with optical line terminal (OLT) at any time, and is irrelevant fully with other users, eliminated the problem of management that shared channel brings.In addition, full optical virtual private network (OVPN) also is in these years fast-developing emerging Internet service, and it has fully utilized existing Internet resources, under low situation about dropping into, has fully satisfied the demand that the client is set up private network, privately owned communication.This technology uses independently that optical channel connects VPN user, has eliminated the bottleneck that electric treatment caused of optical line terminal, can improve network throughput, reduces virtual private network (VPN) communication and postpones.Yet the passive optical network system scheme of existing fusion full optical virtual private network service has all concentrated on attentiveness in the realization of traditional cable business, does not also have to launch concrete deep research to the realization of the new wireless traffic that rises at present.
Through existing literature search is found; Paper in the optical technology wall bulletin (Photonics Technology Letters) " Demonstration and Scalability Analysis of All-Optical Virtual Private Network inMultiple Passive Optical Networks Using ASK/FSK Format (based on the demonstration and the autgmentability analysis of the full optical virtual private network of orthogonal modulation code type) "; Traditional cable business system for transmitting that a kind of passive optical network and full optical virtual private network combine has been proposed; This technology is furnished with a frequency shift keying (FSK) optical sender at optical network unit (ONU) end; Full optical virtual private network signal sends through this optical sender; Because the overall magnitude of frequency shift keyed signals can not change,, it comes to be obtained the light signal of amplitude/frequency shift keying (ASK/FSK) form by the uplink signal strength modulation so can be used as a carrier wave again; This signal transmits to up direction, arrives the optical line terminal end; In optical line terminal, light signal is divided into two parts by one 1 * 2 optical coupler, and a part finally by the receiver demodulation in the optical line terminal, obtains upstream data through optical circulator and array waveguide grating (AWG) router; Another part light signal; A peak is reflected back by Fiber Bragg Grating FBG (FBG) in the frequency shift keyed signals; And be broadcast to the optical network unit of all this wavelength of use, at this moment owing to have only a peak of frequency shift keyed signals, this signal can be used as that non-return-to-zero (NRZ) signal is received and demodulation.Therefore, use the optical network unit of same wavelength just can constitute a full optical virtual private network.But this technology has drawback: full optical virtual net signal and downstream signal all are baseband signals, after the receiving terminal demodulation, can only obtain the base band wire signal, can not realize wired and wireless dual traffic transmission; All need a frequency shift keying optical sender at each optical network unit end, increased the cost of EPON greatly.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency that prior art exists, the passive optical network of a kind of fusing wireless and full optical virtual private network service is provided.The present invention utilizes light carrier to suppress modulation (OCS) technology, has realized merging wired and the wireless duplicate transmissions business in the passive optical network of full optical virtual private network service, have very strong flexibility, and cost is low.
The present invention realizes through following technical scheme:
The present invention includes: optical line terminal, feeder line optical fiber, distant-end node, array waveguide grating (AWG), profile fiber and optical network unit; Wherein: optical line terminal link to each other with feeder line optical fiber hybrid orthogonal signal (OCS-DPSK/ASK) and the base band upward signal of transmission of downlink signal and the carrier suppressed of carrying full optical virtual private network data and the orthogonal signalling (DPSK/ASK) of full optical virtual private network signal mixing; Link to each other with the distant-end node hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of feeder line optical fiber; Link to each other with the array waveguide grating hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of distant-end node; Link to each other with the optical network unit hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of link to each other with the profile fiber hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of waveguide array grating, profile fiber.
The carrier wave that described downstream signal comprises centered carrier (CW) and carries downlink data presses down differential phase modulation signal (OCS-DPSK).
Described optical line terminal comprises: N downstream signal transmitter, first circulator, N first optical receiver, the one 2 * 1 optical coupler, bidirectional optical amplifier, second circulator, first Mach-Zehnder modulator, first radio frequency (RF) signal generator and first DC power supply, wherein: first port of the downstream signal transmitter and first circulator transmission of downlink signal that links to each other; The 3rd port of first circulator links to each other with first optical receiver and transmits the orthogonal signalling of base band upward signal and the mixing of full optical virtual private network signal; Second port of first circulator link to each other with first port of the one 2 * 1 optical coupler transmission of downlink signal and base band hybrid orthogonal signal; Second port of the one 2 * 1 optical coupler links to each other with second port of second circulator and transmits the hybrid orthogonal signal (OCS-DPSK/ASK) of base band hybrid orthogonal signal and carrier suppressed; The 3rd port of second circulator links to each other with the input of first Mach-Zehnder modulator and transmits base band hybrid orthogonal signal; The hybrid orthogonal signal that the output of first Mach-Zehnder modulator and first port of second circulator link to each other and transmit carrier suppressed; First radio-frequency signal generator transmitting radio frequency signal that links to each other with the prevention at radio-frequency port of first Mach-Zehnder modulator; First DC power supply links to each other with the offset port of first Mach-Zehnder modulator and transmits direct current biasing; The 3rd port of the one 2 * 1 optical coupler link to each other with bidirectional optical amplifier the hybrid orthogonal signal and the base band hybrid orthogonal signal of transmission of downlink signal, carrier suppressed, the output of bidirectional optical amplifier link to each other with feeder line optical fiber the hybrid orthogonal signal and the base band hybrid orthogonal signal of transmission of downlink signal, carrier suppressed.
Described downstream signal transmitter comprises: tunable laser, two parallel Mach-Zehnder modulator (DPMZM), first pulse-pattern generator (PPG), second radio-frequency signal generator, electric multiplication and second DC power supply; Wherein: tunable laser links to each other with two parallel Mach-Zehnder modulators and transmits light carrier; First pulse-pattern generator transmitting downlink data that links to each other with first port of electric multiplication; Second radio-frequency signal generator transmitting radio frequency signal that links to each other with second port of electric multiplication; The mixed frequency signal that link to each other the 3rd port of electric multiplication and the prevention at radio-frequency port of two parallel Mach-Zehnder modulators transmitting downlink data and radiofrequency signal multiply each other; Second DC power supply and the two parallel Mach-Zehnder modulator offset port transmission bias current that links to each other, first port of the output of two parallel Mach-Zehnder modulators and first circulator transmission of downlink signal that links to each other.
Described optical network unit comprises: the 3rd circulator, the 4th circulator, first Fiber Bragg Grating FBG, second Fiber Bragg Grating FBG, downlink data receiver, full optical virtual private network (OVPN) data receiver, second Mach-Zehnder modulator, second pulse-pattern generator and the 3rd pulse-pattern generator; Wherein: second port of the 3rd circulator link to each other with profile fiber transmission of downlink signal and base band hybrid orthogonal signal; Link to each other with first port of the 4th circulator hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of the 3rd port of the 3rd circulator; Link to each other with first Fiber Bragg Grating FBG hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of second port of the 4th circulator; The 3rd port of the 4th circulator links to each other with second Fiber Bragg Grating FBG and transmits the hybrid orthogonal signal of carrier suppressed differential phase modulation signal and carrier suppressed; First output port of second Fiber Bragg Grating FBG links to each other with the downlink data receiver and transmits carrier suppressed differential phase modulation signal; Link to each other with the full optical virtual private network data receiver hybrid orthogonal signal of transmission intercal carrier suppressed of second output port of second Fiber Bragg Grating FBG; First Fiber Bragg Grating FBG transmission center carrier wave that links to each other with second Mach-Zehnder modulator; Second pulse-pattern generator transfer of virtual private network data that link to each other with the prevention at radio-frequency port of second Mach-Zehnder modulator; The 3rd pulse-pattern generator transmit ascending data that links to each other with the offset port of second Mach-Zehnder modulator, the output port of second Mach-Zehnder modulator transmission base band hybrid orthogonal signal that links to each other with first port of the 3rd circulator.
Described Fiber Bragg Grating FBG, it has two port outputs, is used for the Signal Separation that is positioned at different frequency range.
Described downlink data receiver; Comprise: the first Mach-Zehnder delay interferometer (MZDI), the 21 * 2 optical coupler, first photodetector (PD) and second photodetector; Wherein: the first Mach-Zehnder delay interferometer links to each other with first port of the 21 * 2 optical coupler and transmits carrier suppressed differential amplitude modulation signal (OCS-ASK) signal; Second port of the 21 * 2 optical coupler links to each other with first photodetector and transmits carrier suppressed differential amplitude modulation signal, and the 3rd port of the 21 * 2 optical coupler links to each other with second photodetector and transmits carrier suppressed differential amplitude modulation signal.
Described full optical virtual netting index is according to receiver; Comprise: the second Mach-Zehnder delay interferometer, the 31 * 2 optical coupler, the 3rd photodetector and the 4th photodetector; Wherein: the second Mach-Zehnder delay interferometer links to each other with first port of the 31 * 2 optical coupler and transmits the hybrid orthogonal signal of the carrier suppressed that contains full optical virtual netting index certificate; The hybrid orthogonal signal that second port of the 31 * 2 optical coupler links to each other and transmits carrier suppressed with the 3rd photodetector, the hybrid orthogonal signal that the 3rd port of the 31 * 2 optical coupler links to each other and transmits carrier suppressed with the 4th photodetector.
Compared with prior art; The present invention has following beneficial effect: the present invention is through being positioned at a loop structure of optical line terminal; The optical network unit that will be positioned at the different passive optical networks of low one-level is formed the full optical virtual net, and the upstream data of each optical network unit and Virtual Private Network data can be transmitted simultaneously; Downlink data is to be transferred to the optical network unit end with the form that the carrier suppressed differential phase is modulated among the present invention; Receiving the signal that obtains at optical network unit end downlink data receiver can be wired baseband signal; Can be wireless millimeter wave signal also, have double selection property; Full optical virtual netting index certificate also is to be transferred in the optical network unit end full optical virtual net signal receiver with the form that the carrier suppressed differential phase is modulated among the present invention, has wired and wireless double selectivity equally; The present invention sends light carrier at the single-ended laser that do not use of optical-fiber network, but utilizes the existing light carrier in the downstream transmission signals to load upstream data and full optical virtual data, and cost reduces.
Description of drawings
Fig. 1 is the structural representation of optical line terminal;
Fig. 2 is the structural representation of downstream signal transmitter;
Fig. 3 is the structural representation of optical network unit;
Fig. 4 is the structural representation of downlink data receiver;
Fig. 5 is the principle schematic that second Mach-Zehnder modulator loads upstream data and full optical virtual netting index certificate;
Fig. 6 is downstream signal transmission sketch map;
Fig. 7 is the uplink signal transmissions sketch map;
Fig. 8 is a full optical virtual net signal transmission sketch map.
Embodiment
Below in conjunction with accompanying drawing system of the present invention is further described: present embodiment provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Embodiment
Present embodiment comprises: optical line terminal, feeder line optical fiber, distant-end node, array waveguide grating, profile fiber and optical network unit; Wherein: optical line terminal link to each other with feeder line optical fiber hybrid orthogonal signal and the base band upward signal of transmission of downlink signal and the carrier suppressed of carrying full optical virtual private network data and the orthogonal signalling of full optical virtual private network signal mixing; Link to each other with the distant-end node hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of feeder line optical fiber; Link to each other with the array waveguide grating hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of distant-end node; Link to each other with the optical network unit hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of link to each other with the profile fiber hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of waveguide array grating, profile fiber.
Described downstream signal comprises centered carrier and presses down the differential phase modulation signal with the carrier wave that carries downlink data.
As shown in Figure 1; Described optical line terminal comprises: downstream signal transmitter 1, first circulator 2, first optical receiver the 3, the one 2 * 1 optical coupler 4, bidirectional optical amplifier 7, second circulator 5, first Mach-Zehnder modulator 6, first radio-frequency signal generator 24 and first DC power supply 25; Wherein: first port of the downstream signal transmitter 1 and first circulator 2 transmission of downlink signal that links to each other; The 3rd port of first circulator 2 links to each other with first optical receiver 3 and transmits the orthogonal signalling of base band upward signal and the mixing of full optical virtual private network signal; Second port of first circulator 2 link to each other with first port of the one 2 * 1 optical coupler 4 transmission of downlink signal and base band hybrid orthogonal signal; Second port of the one 2 * 1 optical coupler 4 links to each other with second port of second circulator 5 and transmits the hybrid orthogonal signal of base band hybrid orthogonal signal and carrier suppressed; The 3rd port of second circulator 5 links to each other with the input of first Mach-Zehnder modulator 6 and transmits base band hybrid orthogonal signal; The hybrid orthogonal signal that the output of first Mach-Zehnder modulator 6 and first port of second circulator 5 link to each other and transmit carrier suppressed; First radio-frequency signal generator 24 transmitting radio frequency signal that links to each other with the prevention at radio-frequency port of first Mach-Zehnder modulator 6; First DC power supply 25 links to each other with the offset port of first Mach-Zehnder modulator 6 and transmits direct current biasing; The 3rd port of the one 2 * 1 optical coupler 4 link to each other with bidirectional optical amplifier 7 the hybrid orthogonal signal and the base band hybrid orthogonal signal of transmission of downlink signal, carrier suppressed, the output of bidirectional optical amplifier 7 link to each other with feeder line optical fiber the hybrid orthogonal signal and the base band hybrid orthogonal signal of transmission of downlink signal, carrier suppressed.
As shown in Figure 2; Described downstream signal transmitter comprises: tunable laser 15, two parallel Mach-Zehnder modulator 16, first pulse-pattern generator 17, radio-frequency signal generator 18, electric multiplication 19 and second DC power supply 26; Wherein: tunable laser 15 links to each other with two parallel Mach-Zehnder modulators 16 and transmits light carrier; First pulse-pattern generator 17 links to each other with first port of electric multiplication 19 and transmits the 1.25Gbps downlink data; Radio-frequency signal generator 18 links to each other with second port of electric multiplication 19 and transmits the 30GHz radiofrequency signal; The 3rd port of electric multiplication 19 mixed frequency signal that transmitting downlink data and radiofrequency signal multiply each other that links to each other with the prevention at radio-frequency port of two parallel Mach-Zehnder modulator 16 upper arm (MZM-a); The output of two parallel Mach-Zehnder modulators 16 transmission of downlink signal that links to each other with first circulator 2, second DC power supply 26 and the two parallel Mach-Zehnder modulator 16 offset port transmission bias current that links to each other.
Described tunable laser 15 models are TSL-210F, are used to export continuous laser, and light source is provided.
The model of described two parallel Mach-Zehnder modulators 16 is Mach-10TM060; Its upper arm (MZM-a) prevention at radio-frequency port is used for the downlink data signal of telecommunication is modulated to continuous light; Suitably regulate bias current and load radiofrequency signal, generate the carrier suppressed differential phase modulation signal that carries downlink data; Its offset port does not load any signal, suitably regulates bias current, obtains the simple light carrier wave; From the downstream signal of two parallel Mach-Zehnder modulator 16 outputs outputs is the mixed signal of carrier suppressed differential phase modulation signal and centered carrier, and wherein carrier suppressed differential phase modulation signal carries downlink data.
The signal of described first pulse-pattern generator 17 is TG2P1A, and it provides the adjustable output signal of telecommunication of amplitude as downlink data.
The model of described radio-frequency signal generator 18 is Agilent E8257 PSG, is used to provide radiofrequency signal, is loaded into two parallel Mach-Zehnder modulators 16.
Described electric multiplication 19 is mixed with first pulse-pattern generator, the 17 output signals of telecommunication and radio-frequency signal generator 18 output radiofrequency signals.
As shown in Figure 3; Described optical network unit comprises: the 3rd circulator 8, the 4th circulator 9, second Fiber Bragg Grating FBG 10, full optical virtual private network data receiver 11, downlink data receiver 12, first Fiber Bragg Grating FBG 13, second Mach of zehnder modulators 14, second pulse-pattern generator 27 and the 3rd pulse-pattern generator 28; Wherein: bidirectional optical amplifier 7 link to each other with second port of the 3rd circulator 8 hybrid orthogonal signal and the base band upward signal of transmission of downlink signal and carrier suppressed and the orthogonal signalling that the VPN signal mixes; Link to each other with first port of the 4th circulator 9 hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of the 3rd port of the 3rd circulator 8; Link to each other with the first Fiber Bragg Grating FBG 13 hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of second port of the 4th circulator 9; The 3rd port of the 4th circulator 9 links to each other with second Fiber Bragg Grating FBG 10 to transmit and carries the carrier suppressed differential phase modulation signal of downlink data and the hybrid orthogonal signal of carrier suppressed; First output port of second Fiber Bragg Grating FBG 10 links to each other with downlink data receiver 12 and transmits the carrier suppressed differential phase modulation signal that carries downlink data; Second output port of second Fiber Bragg Grating FBG 10 links to each other with full optical virtual private network data receiver 11 to transmit and carries the carrier suppressed hybrid orthogonal signal of full optical virtual private network data; First Fiber Bragg Grating FBG 13 links to each other with second Mach-Zehnder modulator 14 and transmits light carrier; The second pulse-pattern generator 27 transfer of virtual private network data that link to each other with the prevention at radio-frequency port of second Mach-Zehnder modulator 14; Link to each other with first port of the 3rd circulator 8 orthogonal signalling of transmission base band upward signal and the mixing of VPN signal of the 3rd pulse-pattern generator 28 transmit ascending data that links to each other with the offset port of second Mach-Zehnder modulator 14, the output port of second Mach-Zehnder modulator 14; Second port output hybrid orthogonal signal of the 3rd circulator 8.
The model of described Fiber Bragg Grating FBG all is purple coral FBG-A15500, is used to leach the signal in the CF segment limit, reflects the signal of other frequency ranges.
The model of described second Mach-Zehnder modulator 14 is JDS-10G-MZM:21023816, is used for loading upstream data and full optical virtual private network data.
As shown in Figure 4; Described downlink data receiver 12; Comprise: the first Mach-Zehnder delay interferometer the 20, the 21 * 2 optical coupler 21, first photodetector 22 and second photodetector 23; Wherein: a MZDI 20 links to each other with first port of the 21 * 2 optical coupler 21 and transmits the carrier suppressed differential phase modulation signal that carries downlink data; Second port of the 21 * 2 optical coupler 21 links to each other with first photodetector 22 and transmits carrier suppressed differential phase modulation signal, and the 3rd port of the 21 * 2 optical coupler 21 links to each other with second photodetector 23 and transmits carrier suppressed differential phase modulation signal.
The described first Mach-Zehnder delay interferometer 20 is used for carrier suppressed differential phase modulation signal is converted into the carrier suppressed am signals.
Described first photodetector 22 is used for demodulation light carrier inhibition-am signals, makes it to be converted into the millimeter wave signal of telecommunication, wireless output.
Described second photodetector 23 is used for demodulation light carrier inhibition-am signals, makes it to be converted into base electrical signal, wired output.
The model of photodetector all is XPDV2140R in the present embodiment.
Described full optical virtual netting index is identical with the structure of downlink data receiver 12 according to the structure of receiver 11; Comprise: the second Mach-Zehnder delay interferometer, the 31 * 2 optical coupler, the 3rd photodetector and the 4th photodetector; Wherein: the second Mach-Zehnder delay interferometer links to each other with first port of the 31 * 2 optical coupler and transmits the hybrid orthogonal signal of the carrier suppressed that contains full optical virtual netting index certificate; The hybrid orthogonal signal that second port of the 31 * 2 optical coupler links to each other and transmits carrier suppressed with the 3rd photodetector, the hybrid orthogonal signal that the 3rd port of the 31 * 2 optical coupler links to each other and transmits carrier suppressed with the 4th photodetector.
Second Mach-Zehnder modulator, 14 loading upstream datas and full optical virtual netting index are as shown in Figure 5 according to principle schematic: at the optical network unit end; Upstream data and full optical virtual netting index form the hybrid orthogonal signal according to being loaded on second Mach-Zehnder modulator 14 simultaneously, and its principle is following: the full optical virtual netting index is according to the prevention at radio-frequency port that is loaded into second Mach-Zehnder modulator 14; Second Mach-Zehnder modulator, 14 bias points are adjusted in minimum point; Obtain the differential phase modulation signal this moment, then upstream data is loaded into the offset port of second Mach-Zehnder modulator 14, as shown in Figure 5; Along with 0,1 of upstream data changes; The amplitude of the differential phase modulation signal of output will change, and just the upstream data intensity modulated arrived on the differential phase modulation signal, just obtain the hybrid orthogonal signal at second Mach-Zehnder modulator, 14 output ports like this; Wherein the differential phase modulation signal carries full optical virtual netting index certificate, and am signals carries upstream data.
As shown in Figure 6, the downstream signal transmission course is in the present embodiment: tunable laser 15 links to each other with the input of two parallel Mach-Zehnder modulators 16 and transmits light carrier; Light carrier is divided into two-way in two parallel Mach-Zehnder modulators 16: set out on a journey through MZM-a; The prevention at radio-frequency port of MZM-a loads the downlink data that sends from first pulse-pattern generator 17 and the mixing signal of telecommunication of the 30GHz radiofrequency signal sent from radio-frequency signal generator 18; Be biased in minimum point, obtain carrying the carrier suppressed differential phase modulation signal of the interval 60GHz of downlink data; Following road is through MZM-b, and the prevention at radio-frequency port of MZM-b does not load any signal, suitably regulates biasing, obtains the light carrier of certain amplitude; The output port of two parallel Mach-Zehnder modulators 16 links to each other with first circulator 2 and transmits the downstream signal of carrier suppressed differential phase modulation signal and light carrier mixing; First circulator 2 links to each other with the one 2 * 1 optical coupler 4 and transmits the downstream signal of carrier suppressed differential phase modulation signal and light carrier mixing; The one 2 * 1 optical coupler 4 links to each other with bidirectional optical amplifier 7 and transmits the downstream signal of carrier suppressed differential phase modulation signal and light carrier mixing; Bidirectional optical amplifier 7 links to each other with second port of the 3rd circulator 8 and transmits the downstream signal of carrier suppressed differential phase modulation signal and light carrier mixing; The 3rd port of the 3rd circulator 8 links to each other with first port of the 4th circulator 9 and transmits the downstream signal of carrier suppressed differential phase modulation signal and light carrier mixing; Second port of the 4th circulator 9 links to each other with first Fiber Bragg Grating FBG 13 and transmits the downstream signal of carrier suppressed differential phase modulation signal and light carrier mixing; First Fiber Bragg Grating FBG 13 links to each other with second Mach-Zehnder modulator 14 and transmits light carrier; First Fiber Bragg Grating FBG 13 links to each other with second port of the 4th circulator 9 and transmits the carrier suppressed differential phase modulation signal that carries downlink data; The 3rd port of the 4th circulator 9 links to each other with the input of second Fiber Bragg Grating FBG 10 and transmits the carrier suppressed differential phase modulation signal that carries downlink data; First port of second Fiber Bragg Grating FBG 10 links to each other with downlink data receiver 12 and transmits the carrier suppressed differential phase modulation signal that carries downlink data; The carrier suppressed differential phase modulation signal that 12 pairs of downlink data receivers carry downlink data carries out demodulation, obtains the millimeter wave wireless signal of base band wire signal and 60Ghz.
As shown in Figure 7, the uplink signal transmissions process is in the present embodiment: at the optical network unit end, the transmission light carrier links to each other with second Mach-Zehnder modulator 14 in first Fiber Bragg Grating FBG 13; The offset port of second Mach-Zehnder modulator 14 loads upstream data; Prevention at radio-frequency port wouldn't load full optical virtual netting index certificate; The signal that comes out from second Mach-Zehnder modulator, 14 outputs is the am signals that carries upstream data; When loading full optical virtual private network data; The signal that comes out from second Mach-Zehnder modulator, 14 outputs is the hybrid orthogonal signal that carries upstream data and full optical virtual private network data, and wherein am signals carries upstream data, and the differential phase modulation signal carries full optical virtual private network data.Second Mach-Zehnder modulator 14 links to each other with first port of the 3rd circulator 8 and transmits the hybrid orthogonal signal; The second port bidirectional optical amplifier 7 of the 3rd circulator 8 links to each other and transmits the hybrid orthogonal signal; Bidirectional optical amplifier 7 links to each other with the one 2 * 1 optical coupler 4 and transmits the hybrid orthogonal signal; The one 2 * 1 optical coupler 4 links to each other with second port of first circulator 2 and transmits the hybrid orthogonal signal; The 3rd port of first circulator 2 links to each other with first optical receiver 3 and transmits the hybrid orthogonal signal; Am signals in 3 pairs of mixed signals of first optical receiver carries out demodulation, obtains upstream data.
As shown in Figure 8, full optical virtual private network signals transmission is in the present embodiment: at the optical network unit end, the transmission light carrier links to each other with second Mach-Zehnder modulator 14 in first Fiber Bragg Grating FBG 13; The full optical virtual netting index is according to the prevention at radio-frequency port that is loaded into second Mach-Zehnder modulator 14; The bias-adjusted of second Mach-Zehnder modulator 14 is in the minimum point of MZM transmission curve at this moment; When not loading upward signal; From second Mach-Zehnder modulator, 14 outputs output differential phase modulation signal, when loading upward signal, from second Mach-Zehnder modulator, 14 outputs output hybrid orthogonal signal.Second Mach-Zehnder modulator 14 links to each other with first port of the 3rd circulator 8 and transmits the hybrid orthogonal signal; Second port of the 3rd circulator 8 links to each other with bidirectional optical amplifier 7 and transmits the hybrid orthogonal signal; Bidirectional optical amplifier 7 links to each other with the one 2 * 1 optical coupler 4 and transmits the hybrid orthogonal signal; The one 2 * 1 optical coupler 4 links to each other with second port of second circulator 5 and transmits the hybrid orthogonal signal; The 3rd port of second circulator 5 links to each other with first Mach-Zehnder modulator 6 and transmits the hybrid orthogonal signal; Load the radiofrequency signal of 10GHz on the prevention at radio-frequency port of first Mach-Zehnder modulator 6, be biased in the minimum point of Mach-Zehnder modulator transmission curve, from the mixed orthogonal signalling of the carrier suppressed of the output output gap 20GHz of first Mach-Zehnder modulator 6; First Mach-Zehnder modulator 6 links to each other with first port of second circulator 5 and transmits the mixed orthogonal signalling of carrier suppressed; Second port of second circulator 5 links to each other with the one 2 * 1 optical coupler 4 and transmits the mixed orthogonal signalling of carrier suppressed; The one 2 * 1 optical coupler 4 links to each other with bidirectional optical amplifier 7 and transmits the mixed orthogonal signalling of carrier suppressed; Bidirectional optical amplifier 7 links to each other with second port of the 3rd circulator 8 and transmits the mixed orthogonal signalling of carrier suppressed; The 3rd port of the 3rd circulator 8 links to each other with first port of the 4th circulator 9 and transmits the mixed orthogonal signalling of carrier suppressed; Second port of the 4th circulator 9 links to each other with first Fiber Bragg Grating FBG 13 and transmits the mixed orthogonal signalling of carrier suppressed; First Fiber Bragg Grating FBG 13 links to each other with second port of the 4th circulator 9 and transmits the mixed orthogonal signalling of carrier suppressed; The 3rd port of the 4th circulator 9 links to each other with second Fiber Bragg Grating FBG 10 and transmits the mixed orthogonal signalling of carrier suppressed; Second Fiber Bragg Grating FBG 10 links to each other with full optical virtual private network data receiver 11 and transmits the mixed orthogonal signalling of carrier suppressed; Full optical virtual private network data receiver 11 obtains the wireless full optical virtual private network of base band and 60GHz signal with the carrier suppressed differential phase modulation signal demodulation in the mixed orthogonal signalling of carrier suppressed.
Present embodiment is at optical line terminal; Introduce a loop that constitutes by second circulator 5 and first Mach-Zehnder modulator 6; After this loop checking installation can will pass to the full optical virtual net signal remodulates of optical line terminal from the optical network unit end, spread out of optical line terminal through the one 2 * 1 optical coupler 4 with bidirectional optical amplifier 7 again, get into the optical network unit end; This loop constitutes a full optical virtual light net with using the optical network unit of identical wavelength to connect in the different EPONs; At optical line terminal, what the prevention at radio-frequency port of first Mach-Zehnder modulator 6 loaded is the radiofrequency signal of 10GHz, is biased in the transmission curve minimum point; Through its hybrid orthogonal signal that carries full optical virtual netting index certificate, will become the hybrid orthogonal signal of the carrier suppressed of 20GHz at interval, therefore at the optical network unit end; The signal that comes out according to demodulation the receiver 11 different photodetectors from the full optical virtual netting index; Existing wireless signal has wire signal again, has realized dual traffic transmission; At optical line terminal; The signal format of carrying downlink data that from downstream signal transmitter 1, emits is the modulation of carrier suppressed differential phase; So at the optical network unit end, the signal that demodulation is come out from downlink data receiver 12 different photodetectors, existing wireless signal; Wire signal is arranged again, realized the dual traffic transmission of wire and wireless; At the optical network unit end; Present embodiment does not use new laser to produce light carrier, but utilizes first Fiber Bragg Grating FBG 13, from downstream signal, leaches a light carrier; Be used as the carrier of upstream data and full optical virtual netting index certificate, therefore greatly reduce the cost of optical network unit.In addition, because downstream signal and full optical virtual net signal are positioned at different frequency range,, help guaranteeing quality of signals so can not disturb between two kinds of signals.
Claims (4)
1. the passive optical network of fusing wireless and full optical virtual private network service; Comprise: optical line terminal, feeder line optical fiber, distant-end node, array waveguide grating, profile fiber and optical network unit; It is characterized in that; Wherein: optical line terminal link to each other with feeder line optical fiber hybrid orthogonal signal and the base band upward signal of transmission of downlink signal and the carrier suppressed of carrying full optical virtual private network data and the orthogonal signalling of full optical virtual private network signal mixing; Link to each other with the distant-end node hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of feeder line optical fiber; Link to each other with the array waveguide grating hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of distant-end node; Link to each other with the optical network unit hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of link to each other with the profile fiber hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of array waveguide grating, profile fiber;
Described optical line terminal comprises: N downstream signal transmitter, first circulator, N first optical receiver, the one 2 * 1 optical coupler, bidirectional optical amplifier, second circulator, first Mach-Zehnder modulator, first radio-frequency signal generator and first DC power supply, wherein: first port of the downstream signal transmitter and first circulator transmission of downlink signal that links to each other; The 3rd port of first circulator links to each other with first optical receiver and transmits the orthogonal signalling of base band upward signal and the mixing of full optical virtual private network signal; Second port of first circulator link to each other with first port of the one 2 * 1 optical coupler transmission of downlink signal and base band hybrid orthogonal signal; Second port of the one 2 * 1 optical coupler links to each other with second port of second circulator and transmits the hybrid orthogonal signal of base band hybrid orthogonal signal and carrier suppressed; The 3rd port of second circulator links to each other with the input of first Mach-Zehnder modulator and transmits base band hybrid orthogonal signal; The hybrid orthogonal signal that the output of first Mach-Zehnder modulator and first port of second circulator link to each other and transmit carrier suppressed; First radio-frequency signal generator transmitting radio frequency signal that links to each other with the prevention at radio-frequency port of first Mach-Zehnder modulator; First DC power supply links to each other with the offset port of first Mach-Zehnder modulator and transmits direct current biasing; The 3rd port of the one 2 * 1 optical coupler link to each other with bidirectional optical amplifier the hybrid orthogonal signal and the base band hybrid orthogonal signal of transmission of downlink signal, carrier suppressed, the output of bidirectional optical amplifier link to each other with feeder line optical fiber the hybrid orthogonal signal and the base band hybrid orthogonal signal of transmission of downlink signal, carrier suppressed;
Described optical network unit comprises: the 3rd circulator, the 4th circulator, first Fiber Bragg Grating FBG, second Fiber Bragg Grating FBG, downlink data receiver, full optical virtual private network data receiver, second Mach-Zehnder modulator, second pulse-pattern generator and the 3rd pulse-pattern generator; Wherein: second port of the 3rd circulator link to each other with profile fiber transmission of downlink signal and base band hybrid orthogonal signal; Link to each other with first port of the 4th circulator hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of the 3rd port of the 3rd circulator; Link to each other with first Fiber Bragg Grating FBG hybrid orthogonal signal of transmission of downlink signal and carrier suppressed of second port of the 4th circulator; The 3rd port of the 4th circulator links to each other with second Fiber Bragg Grating FBG and transmits the hybrid orthogonal signal of carrier suppressed differential phase modulation signal and carrier suppressed; First output port of second Fiber Bragg Grating FBG links to each other with the downlink data receiver and transmits carrier suppressed differential phase modulation signal; Second output port of second Fiber Bragg Grating FBG links to each other with full optical virtual private network data receiver to transmit and carries the carrier suppressed hybrid orthogonal signal of full optical virtual private network data; First Fiber Bragg Grating FBG transmission center carrier wave that links to each other with second Mach-Zehnder modulator; Second pulse-pattern generator transfer of virtual private network data that link to each other with the prevention at radio-frequency port of second Mach-Zehnder modulator; Link to each other with first port of the 3rd circulator orthogonal signalling of transmission base band upward signal and the mixing of full optical virtual private network signal of the 3rd pulse-pattern generator transmit ascending data that links to each other with the offset port of second Mach-Zehnder modulator, the output port of second Mach-Zehnder modulator.
2. the passive optical network of fusing wireless according to claim 1 and full optical virtual private network service; It is characterized in that; Described downstream signal transmitter comprises: tunable laser, two parallel Mach-Zehnder modulator, first pulse-pattern generator, second radio-frequency signal generator, electric multiplication and second DC power supply; Wherein: tunable laser links to each other with two parallel Mach-Zehnder modulators and transmits light carrier; First pulse-pattern generator transmitting downlink data that links to each other with first port of electric multiplication; Second radio-frequency signal generator transmitting radio frequency signal that links to each other with second port of electric multiplication; The mixed frequency signal that link to each other the 3rd port of electric multiplication and the prevention at radio-frequency port of two parallel Mach-Zehnder modulators transmitting downlink data and radiofrequency signal multiply each other, second DC power supply and two parallel Mach-Zehnder modulator offset port link to each other and transmit bias current, first port of the output of two parallel Mach-Zehnder modulators and first circulator transmission of downlink signal that links to each other.
3. the passive optical network of fusing wireless according to claim 1 and full optical virtual private network service; It is characterized in that; Described downlink data receiver; Comprise: the first Mach-Zehnder delay interferometer, the 21 * 2 optical coupler, first photodetector and second photodetector; Wherein: the first Mach-Zehnder delay interferometer links to each other with first port of the 21 * 2 optical coupler and transmits carrier suppressed differential phase modulation signal; Second port of the 21 * 2 optical coupler links to each other with first photodetector and transmits carrier suppressed differential phase modulation signal, and the 3rd port of the 21 * 2 optical coupler links to each other with second photodetector and transmits carrier suppressed differential phase modulation signal.
4. the passive optical network of fusing wireless according to claim 1 and full optical virtual private network service; It is characterized in that; Described full optical virtual netting index is according to receiver; Comprise: the second Mach-Zehnder delay interferometer, the 31 * 2 optical coupler, the 3rd photodetector and the 4th photodetector; Wherein: the second Mach-Zehnder delay interferometer links to each other with first port of the 31 * 2 optical coupler and transmits the hybrid orthogonal signal of the carrier suppressed that contains full optical virtual netting index certificate; Second port of the 31 * 2 optical coupler links to each other with the 3rd photodetector and transmits the hybrid orthogonal signal of the carrier suppressed that contains full optical virtual netting index certificate, and the 3rd port of the 31 * 2 optical coupler links to each other with the 4th photodetector and transmits the hybrid orthogonal signal of the carrier suppressed that contains full optical virtual netting index certificate.
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