CN101227754B - Apparatus and method for selectively transmitting video business in wavelength division multiplexing passive optical network - Google Patents
Apparatus and method for selectively transmitting video business in wavelength division multiplexing passive optical network Download PDFInfo
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- CN101227754B CN101227754B CN2008100332923A CN200810033292A CN101227754B CN 101227754 B CN101227754 B CN 101227754B CN 2008100332923 A CN2008100332923 A CN 2008100332923A CN 200810033292 A CN200810033292 A CN 200810033292A CN 101227754 B CN101227754 B CN 101227754B
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Abstract
The invention relates a device and a method for selectively transmitting video services in a wavelength-division multiplex passive optical network, which belongs to the optical communication technical field, the device of the invention is that an output port of a downlink data transmitter is connected with an input port of a video service transmitter, the output port of the video service transmitter is connected with the input port of a second array waveguide grating on a remote node, the output port of the second array waveguide grating is connected to the input port of an optical network unit of a corresponding wavelength communication channel, the output port of the optical network unit is connected with the other input port of the second array waveguide grating, the other output port of the second array waveguide grating is connected with the input port of an uplink data transmitter through fiber transmission, the method of the invention comprises controlling the amplitude modulation signal extinction ratio which is output by a first Mach-Zehnder modulator in the downlink data transmitter to realize transmitting video services dynamically and selectively. The invention has simple structure, low cost, and convenient realizing method, which is convenient for arranging in practical environment.
Description
Technical field
The present invention relates to the apparatus and method in a kind of optical communication technique field, specifically is the apparatus and method that selectivity transmits video traffic in a kind of WDM passive optical network system.
Background technology
Wave division multiplexing passive optical network is a kind of emerging optical communication technique, because of its simple in structure, with low cost, flexible configuration, has become the most competitive scheme that the user realizes broadband access.It utilizes existing low cost optical device, can increase system transmission capacity, extends coverage, and upgradeable broadband inserting service is provided.Traditional Wave division multiplexing passive optical network adopts array waveguide grating that the connection of virtual point-to-multipoint is provided, for improving the practicality of WDM passive optical network system, recently, support the multiple research approach of the video traffic of Point-to-Point Data business and point-to-multipoint also to be suggested simultaneously.But in these schemes, no matter whether the user has ordered Video service, these video traffics all will be received by all terminal uses.And in the system configuration of reality, not all user orders video traffic usually, and in addition, some user also just orders video traffic in a certain certain period of time.Thereby this traditional access network not only wasted system resource, increased the complexity of deployment cost and network route, also makes network insertion lack flexibility.Therefore, in WDM passive optical network system, press for a kind of dynamic network insertion scheme of design and realize that optionally video traffic transmits.
Find by prior art documents, people such as Ning Deng are published in the article " A WDM-PON Architecture with Selective-Broadcast Overlay " (realizing the Wave division multiplexing passive optical network structure of the professional stack of selective broadcast) among the ECOC2007 EuropeanConference on Optical Communication Conference (ECOC Eeuropean Conference on Optical Communications), mention in this article that the mixed modulated code type that adopts quadrature realizes the selectivity transmission of video traffic.In this scheme, adopt counter-rotating NRZ (IRZ) and nonreturn to zero code to carry point-to-point data service, and carry the video traffic of point-to-multipoint with the differential phase keying (DPSK) modulation format.For the user who does not order video traffic, adopt the nonreturn to zero code/differential phase keying (DPSK) sign indicating number type that mixes to carry downstream data traffic and video traffic respectively; For the user who has ordered video traffic, adopt the counter-rotating NRZ/differential phase keying (DPSK) sign indicating number type that mixes to carry downstream data traffic and video traffic respectively, by the modulation format of control downstream data traffic, realize optionally video traffic transmission.But weak point is: the switching that 1, produces counter-rotating NRZ and two kinds of sign indicating number types in electric territory needs the high speed logic device; 2, the receiver structure complexity of differential phase keying (DPSK) sign indicating number type has increased the deployment cost of system.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art, the apparatus and method of selectivity transmission video traffic in a kind of WDM passive optical network system have been proposed, make its extinction ratio control technology based on signal, adopt traditional receiver configuration, just can realize point-to-point data traffic transmission simultaneously and optionally transmit the video traffic of point-to-multipoint, satisfy requirements of different users.
The present invention is achieved by the following technical solutions:
Selectivity transmits the device of video traffic in the Wave division multiplexing passive optical network that the present invention relates to, comprise: optical line terminal, remote node and optical network unit, optical line terminal comprises downlink data transmitter, video traffic transmitter and upstream data receiver, remote node is one second array waveguide grating, wherein: the output port of downlink data transmitter is connected with the input port of video traffic transmitter, the output port of video traffic transmitter links to each other by the input port of Optical Fiber Transmission with second array waveguide grating at remote node place, an output port of second array waveguide grating is connected to the input port of the optical network unit of respective wavelength channel, another input port of the output port of optical network unit and second array waveguide grating is connected, and another output port of second array waveguide grating links to each other by the input port of Optical Fiber Transmission with the upstream data receiver;
Described downlink data transmitter produces the downstream data traffic of N road wavelength division multiplexing, comprise N laser, N first signal generator, N first Mach of zehnder modulators, one first array waveguide grating, wherein: the output port of N laser links to each other with the input port of corresponding first Mach of zehnder modulators respectively, the first signal generator output port links to each other with the rf inputs mouth of corresponding first Mach of zehnder modulators respectively, first signal generator is responsible for producing N road downstream data traffic and is transferred to corresponding first Mach of zehnder modulators, the output port of N first Mach of zehnder modulators and the N of first array waveguide grating corresponding input port are connected, from the downstream data traffic of first array waveguide grating output port output wavelength division multiplexing.
Described video traffic transmitter, comprise a secondary signal generator, second Mach of zehnder modulators and a frequency mixer, wherein: the input port of second Mach of zehnder modulators links to each other with the first array waveguide grating output port, the secondary signal generator produces video traffic and clock signal and is sent to two input ports of frequency mixer respectively, the rf inputs mouth of the output port of frequency mixer and second Mach of zehnder modulators is connected, the light double-sideband signal of video traffic transmitter output wavelength division multiplexing.
Described optical network unit, comprise: the upstream data transmitter, optical filter, optical branching device, the video traffic receiver, the downlink data receiver, wherein: the output port of upstream data transmitter is connected with the input port of second array waveguide grating, the input port of optical filter links to each other with the output port of the second waveguide route grating, optical filter receives the light double-sideband signal of radio service transmitter output, two output ports of optical filter are connected respectively to the input port of video traffic receiver and optical branching device, and two output ports of optical branching device are connected with the input port of downlink data receiver with the upstream data transmitter respectively.
Described upstream data transmitter, comprise the 3rd a Mach of zehnder modulators and one the 3rd signal generator, the input port of the 3rd Mach of zehnder modulators links to each other with output port in the optical branching device, and the 3rd signal generator produces downstream data traffic and is input to the rf inputs mouth of the 3rd Mach of zehnder modulators.
Described optical filter is made of the Fiber Bragg Grating FBG of an optical circulator and a cascade, and the output port of circulator links to each other with the input port of Fiber Bragg Grating FBG.
Selectivity transmits the method for video traffic in the Wave division multiplexing passive optical network that the present invention relates to, and comprises following concrete steps:
Step 2, the downstream data traffic of the N wavelength-channels that step 1 is produced is input to first array waveguide grating, carries out wavelength division multiplexing, and synthetic one the road exports from array waveguide grating;
Described array waveguide grating carries out wavelength division multiplexing, and the light signal of N wavelength-channels is synthetic one the tunnel, also the light signal behind the wavelength division multiplexing can be carried out demultiplexing, obtains the light signal of N wavelength-channels.
Step 3, downlink data signal after synthetic one tunnel is sent to the video traffic transmitter, by second Mach of zehnder modulators modulation, drive second Mach of zehnder modulators with the subcarrier video traffic, second Mach of zehnder modulators is biased in the centre position of transmission curve, obtains the light double-sideband signal of wavelength division multiplexing, and the light double-sideband signal comprises light carrier and two optical sidebands, light carrier only comprises downstream data traffic, and two optical sidebands are stacks of downstream data traffic and video traffic;
Described subcarrier video traffic carries out mixing by video traffic and clock signal by electric frequency mixer and obtains.
Step 4, the extinction ratio of the amplitude shift keying light signal by the first Mach zehnder modulators output of control in the downlink data transmitter is regulated the video traffic on the optical sideband, is implemented in the wavelength channel of setting optionally dynamic assignment video traffic.
Dynamic assignment video traffic optionally in the described wavelength channel that is implemented in setting, be specially: when the extinction ratio of downlink data business is lower than the threshold value of 5dB, the downstream data traffic that is positioned on the optical sideband is very little to the interference of video traffic, recovery video traffic that can be correct guarantees that the user can receive; When the extinction ratio of downlink data business is higher than the threshold value of setting, the downstream data traffic that is positioned on the optical sideband produces serious the interference to video traffic, can't be correct recover video traffic, the extinction ratio of the downstream data traffic of each wavelength channel can independently be regulated, in N wavelength channel, the downstream data traffic extinction ratio of some wavelength is adjusted to higher value, and the extinction ratio of the downstream data traffic of other wavelength is adjusted to lower value.
Step 6, at each optical network unit, isolate light carrier and two optical sidebands in the light double-sideband signal with an optical filter, wherein the signal on two optical sidebands is delivered to the video traffic receiver and is recovered video traffic, and the signal on the light carrier is divided into two-way by optical branching device.
Step 7, be divided into the signal on the light carrier of two-way, one the tunnel delivers to the downlink data receiver recovers downstream data traffic, another road is input to the upstream data transmitter, by the 3rd Mach of zehnder modulators modulation, drive the 3rd Mach of zehnder modulators by upstream data service, the 3rd Mach of zehnder modulators is biased in the centre position of transmission curve, obtains up amplitude shift keying light signal;
In the described step 7, be positioned at signal on the light carrier only when the extinction ratio of downstream data traffic is lower than the threshold value of 5dB, a part wherein could be by the upstream data service remodulates, and at this moment, upstream data service need possess higher extinction ratio (greater than 10dB).
Step 8, upstream data service, is received by the upstream data receiver to optical line terminal through Optical Fiber Transmission, recovers upstream data service.
Compared with prior art, the present invention has following beneficial effect: transmitter section has adopted two common Mach zehnder modulators and electric frequency mixers in the device of the present invention; Receiver only needs common amplitude shift keying signal receiver, thereby structure is simpler, has reduced cost.And people's such as Ning Deng scheme transmitter section has adopted a Mach zehnder modulators and a phase-modulator, and high speed and door; Receiver need adopt common amplitude shift keying signal receiver and complicated phase shift keyed signal receiver, the deployment cost height of system respectively.In addition, the present invention adopts the extinction ratio regulation technology of amplitude shift keying signal to realize optionally transmitting dynamically video traffic, and the control of transmitter and receiver is convenient, and implementation method is simple, is easy to be configured in actual environment.
Description of drawings
Fig. 1 is a structure principle chart of the present invention;
Fig. 2 is for only implementing the structure principle chart of single wavelength in the embodiments of the invention;
Fig. 3 is embodiments of the invention figure as a result.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, selectivity transmits the device of video traffic in the Wave division multiplexing passive optical network of present embodiment, comprise: optical line terminal, remote node and optical network unit, wherein: optical line terminal comprises downlink data transmitter, video traffic transmitter and upstream data receiver, remote node is one second array waveguide grating, wherein: the output port of downlink data transmitter is connected with the input port of video traffic transmitter, the output port of video traffic transmitter links to each other by the input port of Optical Fiber Transmission with second array waveguide grating at remote node place, an output port of second array waveguide grating is connected to the input port of the optical network unit of respective wavelength channel, another input port of the output port of optical network unit and second array waveguide grating is connected, and another output port of second array waveguide grating links to each other by the input port of Optical Fiber Transmission with the upstream data receiver;
Described downlink data transmitter produces the downstream data traffic of N road wavelength division multiplexing, comprise N laser, N first signal generator, N first Mach of zehnder modulators, one first array waveguide grating, wherein: the output port of N laser links to each other with the input port of corresponding first Mach of zehnder modulators respectively, the first signal generator output port links to each other with the rf inputs mouth of corresponding first Mach of zehnder modulators respectively, first signal generator is responsible for producing N road downstream data traffic and is transferred to corresponding first Mach of zehnder modulators, the output port of N first Mach of zehnder modulators and the N of first array waveguide grating corresponding input port are connected, from the downstream data traffic of first array waveguide grating output port output wavelength division multiplexing.
Described video traffic transmitter, comprise a secondary signal generator, second Mach of zehnder modulators and a frequency mixer, wherein: the input port of second Mach of zehnder modulators links to each other with the first array waveguide grating output port, the secondary signal generator produces video traffic and clock signal and is sent to two input ports of frequency mixer respectively, the rf inputs mouth of the output port of frequency mixer and second Mach of zehnder modulators is connected, the light double-sideband signal of video traffic transmitter output wavelength division multiplexing.
Described optical network unit, comprise: the upstream data transmitter, optical filter, optical branching device, the video traffic receiver, the downlink data receiver, wherein: the output port of upstream data transmitter is connected with the input port of second array waveguide grating, the input port of optical filter links to each other with the output port of the second waveguide route grating, optical filter receives the light double-sideband signal of radio service transmitter output, two output ports of optical filter are connected respectively to the input port of video traffic receiver and optical branching device, and two output ports of optical branching device are connected with the input port of downlink data receiver with the upstream data transmitter respectively.
Described upstream data transmitter, comprise the 3rd a Mach of zehnder modulators and one the 3rd signal generator, the input port of the 3rd Mach of zehnder modulators links to each other with output port in the optical branching device, and the 3rd signal generator produces downstream data traffic and is input to the rf inputs mouth of the 3rd Mach of zehnder modulators.
Described optical filter is made of the Fiber Bragg Grating FBG of an optical circulator and a cascade, and the output port of circulator links to each other with the input port of Fiber Bragg Grating FBG.
As shown in Figure 2, only implement to carry out in the single wavelength channel situation that selectivity transmits video traffic for embodiment.Wavelength is that the light carrier of 1549.89nm is input to first Mach of zehnder modulators through first Polarization Controller, the bias voltage of first Mach of zehnder modulators is about 3.1V, 1.25-Gb/s downlink data amplify through first electric amplifier after, drive first Mach of zehnder modulators, produce the amplitude shift keying signal.When the voltage peak-to-peak value of downlink data business was 3.8V, the extinction ratio of amplitude shift keying signal was about 5dB.When the voltage peak-to-peak value of downlink data business was increased to about to 6V, the extinction ratio of amplitude shift keying signal was about 10dB.The output of first Mach of zehnder modulators is input to second Mach of zehnder modulators of cascade after through second Polarization Controller, and its bias voltage is approximately 2.9V.1.25-Gb/s video traffic and the clock signal of 10-GHz carry out obtaining subcarrier signal after the mixing through an electric frequency mixer, be amplified to the peak-to-peak value voltage of about 5.5V through second electric amplifier, drive second Mach of zehnder modulators, obtain the light double-sideband signal.The light double-sideband signal amplifies with an image intensifer, and suppresses spontaneous emission noise with a tunable optical filter.After 25 kilometers Optical Fiber Transmission, the optical filter of forming with a circulator and Fiber Bragg Grating FBG separates light carrier and two optical sidebands in the double-sideband signal.The video traffic receiver that isolated signal is sent to respectively separately carries out opto-electronic conversion, recovers original signal.When extinction ratio is 5dB, data service and video traffic can both correctly be received by the user, in this case, two optical sidebands are directly inputted to the video traffic receiver and recover video traffic, and light carrier is divided into two-way by an optical branching device, one the tunnel is sent to the downlink data receiver recovers downstream data traffic, another road is sent to the 3rd Mach of zehnder modulators through the 3rd Polarization Controller, the 3rd Mach of zehnder modulators bias voltage is 2.9V, driven by the upstream data of 1.25-Gb/s, obtain the amplitude shift keying signal of uplink, after 25 kilometers Optical Fiber Transmission, enter the upstream data receiver and recover upstream data service.When extinction ratio was 10dB, the data service that only is positioned on the light carrier can correctly be received, and the video traffic on the sideband is seriously disturbed by data service, can't correctly recover out.
As shown in Figure 3, be the figure as a result of present embodiment.Fig. 3 (a-i) is the frequency spectrum of light double-sideband, wherein, only carry downstream data traffic on the light carrier, and two sidebands carries video traffic and downstream data traffic simultaneously.The luminous power of light carrier is than two big 3dB of optical sideband; Fig. 3 (a-ii) and (a-iii) are respectively the light carrier that separates and the spectrum of two optical sidebands; Fig. 3 (b-i) and (b-ii) be respectively the light eye pattern and the electric eye figure of two optical sidebands, as can be seen from the figure, when not superposeing on the optical sideband data service any, the eye opening of video traffic is best.When extinction ratio was 5dB, eye pattern occurred two-layer, corresponding video traffic and data service respectively, and this moment, video traffic can correctly be detected; When extinction ratio was 10dB, eye pattern had only one deck, the corresponding data business, and this moment, video traffic was covered by data service fully, can't correctly recover out.Fig. 3 (c-i) and (c-ii) be respectively light eye pattern and the electric eye figure that is positioned at the data service on the light carrier, as can be seen from the figure, when extinction ratio was 5dB, the eye pattern stretching degree was slightly little, and this moment, signal quality was low slightly; When extinction ratio was 10dB, eye pattern opened bigger, and this moment, signal quality was higher, but they can correctly be received at receiving terminal.Some ripples on the light eye pattern are because during with the optical filter separation signal, remaining other becomes branch to cause.Fig. 3 (d-i) and (d-ii) be respectively when extinction ratio is 5dB, the light eye pattern of upstream data service and electric eye figure, eye pattern occurs two-layer, corresponding upstream data service of difference and residual downstream data traffic, because the extinction ratio of upstream data is very high, and the extinction ratio of downlink data has only 5dB, so upstream data service can be by correct detecting.
Claims (8)
1. selectivity transmits the device of video traffic in the Wave division multiplexing passive optical network, comprise: optical line terminal, remote node and optical network unit, it is characterized in that, optical line terminal comprises downlink data transmitter, video traffic transmitter and upstream data receiver, remote node is one second array waveguide grating, wherein: the output port of downlink data transmitter is connected with the input port of video traffic transmitter, the output port of video traffic transmitter links to each other by the input port of Optical Fiber Transmission with second array waveguide grating at remote node place, an output port of second array waveguide grating is connected to the input port of the optical network unit of respective wavelength channel, another input port of the output port of optical network unit and second array waveguide grating is connected, and another output port of second array waveguide grating links to each other by the input port of Optical Fiber Transmission with the upstream data receiver;
Described downlink data transmitter produces the downstream data traffic of N road wavelength division multiplexing, comprise N laser, N first signal generator, N first Mach of zehnder modulators, one first array waveguide grating, wherein: the output port of N laser links to each other with the input port of corresponding first Mach of zehnder modulators respectively, the first signal generator output port links to each other with the rf inputs mouth of corresponding first Mach of zehnder modulators respectively, first signal generator is responsible for producing N road downstream data traffic and is transferred to corresponding first Mach of zehnder modulators, the output port of N first Mach of zehnder modulators and the N of first array waveguide grating corresponding input port are connected, from the downstream data traffic of first array waveguide grating output port output wavelength division multiplexing;
Described video traffic transmitter, comprise a secondary signal generator, second Mach of zehnder modulators and a frequency mixer, wherein: the input port of second Mach of zehnder modulators links to each other with the first array waveguide grating output port, the secondary signal generator produces video traffic and clock signal and is sent to two input ports of frequency mixer respectively, the rf inputs mouth of the output port of frequency mixer and second Mach of zehnder modulators is connected, the light double-sideband signal of video traffic transmitter output wavelength division multiplexing.
2. selectivity transmits the device of video traffic in the Wave division multiplexing passive optical network according to claim 1, it is characterized in that, described optical network unit, comprise: the upstream data transmitter, optical filter, optical branching device, the video traffic receiver, the downlink data receiver, wherein: the output port of upstream data transmitter is connected with the input port of second array waveguide grating, the input port of optical filter links to each other with the output port of the second waveguide route grating, optical filter receives the light double-sideband signal of radio service transmitter output, two output ports of optical filter are connected respectively to the input port of video traffic receiver and optical branching device, and two output ports of optical branching device are connected with the input port of downlink data receiver with the upstream data transmitter respectively.
3. selectivity transmits the device of video traffic in the Wave division multiplexing passive optical network according to claim 2, it is characterized in that, described upstream data transmitter, comprise the 3rd a Mach of zehnder modulators and one the 3rd signal generator, an output port of the optical branching device in the input port of the 3rd Mach of zehnder modulators and the optical network unit links to each other, and the 3rd signal generator produces downstream data traffic and is input to the rf inputs mouth of the 3rd Mach of zehnder modulators.
4. selectivity transmits the device of video traffic in the Wave division multiplexing passive optical network according to claim 2, it is characterized in that, described optical filter is made of the Fiber Bragg Grating FBG of an optical circulator and a cascade, and the output port of circulator links to each other with the input port of Fiber Bragg Grating FBG.
5. selectivity transmits the method for video traffic in the Wave division multiplexing passive optical network, it is characterized in that, comprises the steps:
Step 1, at optical line terminal, N first Mach of zehnder modulators all is biased in the centre position of its transmission curve, produce the amplitude shift keying light signal, and, produce the downstream data traffic of N wavelength-channels by downlink data transmitter by the extinction ratio that the amplitude of first signal generator control downstream data traffic is regulated the amplitude shift keying signal;
Step 2, the downstream data traffic of the N wavelength-channels that step 1 is produced is input to first array waveguide grating, carries out wavelength division multiplexing, and synthetic one the road exports from array waveguide grating;
Step 3, downlink data signal after synthetic one tunnel is sent to the video traffic transmitter, by second Mach of zehnder modulators modulation, drive second Mach of zehnder modulators with the subcarrier video traffic, second Mach of zehnder modulators is biased in the centre position of transmission curve, obtains the light double-sideband signal of wavelength division multiplexing, and the light double-sideband signal comprises light carrier and two optical sidebands, light carrier only comprises downstream data traffic, and two optical sidebands are stacks of downstream data traffic and video traffic;
The extinction ratio of the amplitude shift keying light signal of step 4, control first Mach of zehnder modulators output in the downlink data transmitter is regulated the video traffic on the optical sideband, is implemented in the wavelength channel of setting optionally dynamic assignment video traffic;
Step 5, the light double-sideband signal of wavelength division multiplexing by the second array waveguide grating demultiplexing, obtain the light double-sideband signal of N wavelength-channels at remote node, and the light double-sideband signal on each wavelength-channels is routed to optical network unit separately then;
Step 6, at each optical network unit, isolate light carrier and two optical sidebands in the light double-sideband signal with an optical filter, wherein the signal on two optical sidebands is delivered to the video traffic receiver and is recovered video traffic, and the signal on the light carrier is divided into two-way by optical branching device;
Step 7, be divided into the signal on the light carrier of two-way, one the tunnel delivers to the downlink data receiver recovers downstream data traffic, another road is input to the upstream data transmitter, by the 3rd Mach of zehnder modulators modulation, drive the 3rd Mach of zehnder modulators by upstream data service, the 3rd Mach of zehnder modulators is biased in the centre position of transmission curve, obtains up amplitude shift keying light signal;
Step 8, upstream data service, is received by the upstream data receiver to optical line terminal through Optical Fiber Transmission, recovers upstream data service.
6. selectivity transmits the method for video traffic in the Wave division multiplexing passive optical network according to claim 5, it is characterized in that, described array waveguide grating, be responsible for carrying out wavelength division multiplexing, light signal synthetic a tunnel with the N wavelength-channels, also be responsible for the light signal behind the wavelength division multiplexing is carried out demultiplexing, obtain the light signal of N wavelength-channels.
7. selectivity transmits the method for video traffic in the Wave division multiplexing passive optical network according to claim 5, it is characterized in that, the described optionally dynamic assignment video traffic that is implemented in the certain wavelengths channel, be specially: when the extinction ratio of downlink data business is lower than the threshold value of 5dB, the downstream data traffic that is positioned on the optical sideband is very little to the interference of video traffic, recovery video traffic that can be correct guarantees that the user can receive; When the extinction ratio of downlink data business is higher than the threshold value of setting, the downstream data traffic that is positioned on the optical sideband produces serious the interference to video traffic, can't be correct recover video traffic, the extinction ratio of the downstream data traffic of each wavelength channel is carried out independent regulation.
8. selectivity transmits the method for video traffic in the Wave division multiplexing passive optical network according to claim 5, it is characterized in that described subcarrier video traffic carries out mixing by video traffic and clock signal by electric frequency mixer and obtains.
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| CN101090300A (en) * | 2007-07-12 | 2007-12-19 | 上海交通大学 | Method for generating and transmitting multi-wave signal in light carrier radio communication system |
| CN101106510A (en) * | 2007-08-09 | 2008-01-16 | 上海交通大学 | Full optical VPN system based on orthogonal modulation code |
| CN101110650A (en) * | 2007-07-12 | 2008-01-23 | 上海交通大学 | Passive optical network transmission method integrating treble play |
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| CN101090300A (en) * | 2007-07-12 | 2007-12-19 | 上海交通大学 | Method for generating and transmitting multi-wave signal in light carrier radio communication system |
| CN101110650A (en) * | 2007-07-12 | 2008-01-23 | 上海交通大学 | Passive optical network transmission method integrating treble play |
| CN101106510A (en) * | 2007-08-09 | 2008-01-16 | 上海交通大学 | Full optical VPN system based on orthogonal modulation code |
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