CN101316150B - Wavelength division multiplexing system and method supporting double-video service broadcast distribution - Google Patents
Wavelength division multiplexing system and method supporting double-video service broadcast distribution Download PDFInfo
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- CN101316150B CN101316150B CN2008100401425A CN200810040142A CN101316150B CN 101316150 B CN101316150 B CN 101316150B CN 2008100401425 A CN2008100401425 A CN 2008100401425A CN 200810040142 A CN200810040142 A CN 200810040142A CN 101316150 B CN101316150 B CN 101316150B
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Abstract
The invention discloses a wavelength division multiplex passive optical network system which supports the double video service to carry out broadcasting distribution and pertains to the optical communication technical field. The device is that: a downstream data transmitter is connected with a second array wave guide grating by a double video service transmitter, the output of the second array wave guide grating is connected with the corresponding optical network unit, the output of the optical network unit is connected with the second array wave guide grating, and the output of the second array wave guide grating is connected with an upstream data receiver. The method is that: the downstream data service adopts the phase-shift keying modulation format, and a double parallel Mach-Zehnder modulator is used as the double video service transmitter, wherein, a first video signal adopts the double-sideband modulation format with optical carrier suppression, and a second video signal adopts the reversal return to zero code modulation format; an orthogonal phase-shift keying and a reversal return to zero code signal are modulated by the upstream data service to obtain the upstream data service of the amplitude-shift keying. The invention is flexible in structure, easy to realize and be applied in the actual environment.
Description
Technical field
The present invention relates to the system and method in a kind of optical communication technique field, specifically is a kind of wavelength-division multiplex system and method for supporting the double-video service broadcast distribution.
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.For improving the practicality of WDM passive optical network system, need support the transmission of the broadcasting service of point-to-point downstream data traffic and point-to-multipoint simultaneously.But in the technology that proposes at present, can only transmit single broadcast service, therefore limit the application potential of Wave division multiplexing passive optical network.And, along with the user to high definition television and video request program and the growing demand of other various video traffics of deriving, Video service provider presses for an integrated transmission platform can provide dissimilar video traffics to carry out broadcast distribution simultaneously.Therefore, in WDM passive optical network system, design a kind of cost network configuration effective, simple in structure and realize that the broadcast distribution of double-video service has great importance.
Find by prior art documents, people such as P.P.Iannone are published in the article " High-speed point-to-point and multiple broadcast services delivered over a WDM passive optical network (distribution high speed Point-to-Point Data and multicast/broadcast service in Wave division multiplexing passive optical network) " in periodical " IEEEPhotonics technology Letter " (" IEEE optical tech wall bulletin ") 1998 the 9th volume, mention by cutting out a plurality of narrow light source that wideband light source obtains the free spectral range of matched waveguide grating router, utilize the periodic feature of waveguide grating router then, realize that the broadcasting of high speed Point-to-Point Data and two video traffics transmits.But in this scheme, different wavelength is adopted in the distribution of (1) downstream data traffic and video traffic, therefore needs complicated multi-wavelength management; (2) transmission of upstream data service needs other light source, has increased the cost of optical network unit; (3) optical line terminal adopts the device of a plurality of separation, so light insertion loss is very big.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art, propose a kind of wavelength-division multiplex system and method for supporting the double-video service broadcast distribution, in WDM passive optical network system, transmit the double vision frequency broadcasting service of point-to-point downstream data traffic and point-to-multipoint simultaneously.Point-to-point downstream data traffic among the present invention, double vision be broadcasting service frequently, and the transmission of upstream data service only needs single wavelength, has avoided complicated multi-wavelength management, and can share the fiber basis facility, and the deployment cost of optical network unit is low.
The present invention is achieved by the following technical solutions:
The wavelength-division multiplex system of the support double-video service broadcast distribution that the present invention relates to comprises: optical line terminal, a remote node and N optical network unit.Optical line terminal comprises downlink data transmitter, double-video service transmitter and upstream data receiver, and remote node is one second array waveguide grating.Wherein: the output port of downlink data transmitter is connected with the input port of double-video service transmitter; The output of double-video service transmitter is through linking to each other with an input port of second array waveguide grating at remote node place after the Optical Fiber Transmission; Each output port of second array waveguide grating is connected to the input port of each optical network unit of corresponding wavelength channel; Another input port of the output port of optical network unit and second array waveguide grating is connected; 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 of optical network unit.
Described downlink data transmitter produces the downstream data traffic of N road wavelength division multiplexing, comprises N laser, and wavelength is respectively λ
1... λ
NIndividual first signal generator of N, N first Mach of zehnder modulators, first array waveguide grating.Wherein: the output port of N laser links to each other with the light input end mouth of corresponding first Mach of zehnder modulators respectively.N first signal generator produces N road downstream data traffic, and its output port links to each other with the rf inputs mouth of corresponding first Mach of zehnder modulators respectively.The optical output port of N first Mach of zehnder modulators and the N of first array waveguide grating corresponding input port are connected, and export the N road downstream data traffic of wavelength division multiplexing from the output port of first array waveguide grating.Wherein said " N " represents natural number, is meant number.
Described double-video service transmitter comprises two flying-spot video generators, a signal source of clock, two parallel Mach zehnder modulators, a counter-rotating NRZ encoder and a frequency mixer.The output port of first array waveguide grating is connected to the light input end mouth of two parallel Mach zehnder modulators.The clock signal that vision signal that first flying-spot video generator produces and signal source of clock produce is connected respectively to two input ports of frequency mixer, and the output port of frequency mixer is connected with the rf inputs mouth of first sub-modulator of two parallel Mach zehnder modulators; The vision signal that second flying-spot video generator produces is connected to the input port of counter-rotating NRZ encoder, and the output port of counter-rotating NRZ encoder is connected with the rf inputs mouth of second sub-modulator of two parallel Mach zehnder modulators.The optical output port of two parallel Mach zehnder modulators is exported the output signal of two sub-modulators of the two parallel Mach zehnder modulators that closes the road.
Described two parallel Mach zehnder modulators is made up of two sub-modulators that are integrated on the single chip, and these two sub-modulators have same structure and performance.Each sub-modulator has independently radio-frequency (RF) signal input end mouth and offset port.Also have a main offset port in addition, can be used to regulate the output of two sub-modulators.
Described optical network unit, comprise: optical filter, optical branching device, two video traffic receivers, downlink data receiver and upstream data transmitters, wherein: the light signal of second array waveguide grating output connects the input port of optical filter, and two output ports of optical filter are connected respectively to the input port of the first video traffic receiver and optical branching device.Optical branching device has three output ports, and the input port with downlink data receiver, the second video traffic receiver and upstream data transmitter is connected respectively.The output port of upstream data transmitter is connected with the input port of second array waveguide grating.
Described upstream data transmitter, comprise second Mach of zehnder modulators and a secondary signal generator, the input port of second Mach of zehnder modulators links to each other with output port in the optical branching device, and the downstream data traffic that the secondary signal generator produces is connected to the rf inputs mouth of second Mach of zehnder modulators.
The wavelength division multiplexing method of the support double-video service broadcast distribution that the present invention relates to, wherein: downstream data traffic adopts the phase shift keying modulation format, two parallel Mach zehnder modulators are as the double-video service transmitter, wherein first vision signal adopts the double-sideband modulation form that light carrier suppresses, and second vision signal adopts counter-rotating NRZ modulation format; After the phase shift keying light signal of quadrature and counter-rotating NRZ signal are modulated by upstream data service, obtain the upstream data service of amplitude shift keying, therefore the transmission of downstream data traffic, double-video service and upstream data service only needs single wavelength, avoided complicated multi-wavelength management, and can share the fiber basis facility, the deployment cost of optical network unit is low.This scenario-frame is flexible, realizes easyly, is easy to dispose in actual environment.
Said method of the present invention comprises following concrete steps:
Step 1 at optical line terminal, all is biased in the minimum point of its transmission curve with first Mach zehnder modulators of N, produces phase shift keyed signal.Therefore produce the downstream data traffic of N wavelength-channels;
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 first array waveguide grating;
Described array waveguide grating can carry out wavelength division multiplexing, with the light signal synthetic a tunnel of N wavelength-channels; Also the light signal behind the wavelength division multiplexing can be carried out demultiplexing, obtain the light signal of N wavelength-channels.
Step 3, the downlink data signal that synthesizes after a tunnel is sent to the double-video service transmitter, by the modulation of two parallel Mach zehnder modulators.First sub-modulator of wherein two parallel Mach zehnder modulators drives with first vision signal of subcarrier multiplexing, is biased in the minimum point of transmission curve, obtains the light double-sideband carrier suppressed signal of wavelength division multiplexing.Second sub-modulator of two parallel Mach zehnder modulators uses second video traffic after the counter-rotating NRZ encoder encodes to drive, and is biased in the centre position of transmission curve, obtains the phase shift keyed signal/counter-rotating NRZ signal of wavelength division multiplexing;
First vision signal of described subcarrier multiplexing, the clock signal that is produced by the vision signal and the signal source of clock of first flying-spot video generator output is carried out mixing by electric frequency mixer and is obtained.
The phase shift keying light signal of described quadrature and counter-rotating NRZ signal are respectively the downstream data traffic and second video traffic.Because one is phase modulated signal, another is an am signals, and is mutually orthogonal between them, can the phase mutual interference.
Step 4 is by regulating the main bias point of double-parallel modulator, the output addition of two sub-modulators of feasible two parallel Mach zehnder modulators.Because first sub-modulator output is the signal of carrier suppressed, and second sub-modulator output is the signal that is positioned on the carrier wave, so can not interfere between them.
Step 5, the light signal of the wavelength division multiplexing of double-parallel modulator output by the second array waveguide grating demultiplexing, obtains the light signal of N wavelength-channels at remote node, and the light signal on each wavelength-channels is routed to optical network unit separately then.
Step 6 at each optical network unit, is isolated signal and second signal that sub-modulator is exported of first sub-modulator output of two parallel Mach zehnder modulators with an optical filter.Wherein the signal of first sub-modulator output is delivered to the first video traffic receiver and is recovered first video traffic; And the signal of second sub-modulator output is divided into three the tunnel by optical branching device.
Step 7, be divided into second signal that sub-modulator is exported of three tunnel, the first via is delivered to the downlink data receiver and is recovered downstream data traffic, the second the tunnel is input to the second video traffic receiver recovers second video traffic, Third Road is input to the upstream data transmitter, by second Mach of zehnder modulators modulation.Upstream data service drives second 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, what second sub-modulator of two parallel Mach zehnder modulators exported is the phase shift keying light signal and the counter-rotating NRZ signal of quadrature.Phase shift keyed signal is a phase modulation format, on " 1 " of counter-rotating NRZ signal and the level "0" power is arranged all.Therefore the phase shift keying light signal of quadrature and counter-rotating NRZ signal can be obtained the amplitude shift keying light signal by intensity modulated.
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: it is low that the light of transmitter section of the present invention inserts loss; The transmission of all business only needs single wavelength, has avoided complicated multi-wavelength management; Optical network unit is mended needs additional light source, and deployment cost is low.And people's such as P.P.Iannone scheme transmitter section has adopted the device of a plurality of separation, has increased the luminous power expense of system.The light source of different wave length is adopted in the distribution of downstream data traffic and video traffic, therefore needs complicated multi-wavelength management; The transmission of upstream data service needs other light source, has increased the cost of optical network unit.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is downstream data traffic transmitter figure of the present invention;
Fig. 3 is double-video service transmitter figure of the present invention;
Fig. 4 is optical network unit figure of the present invention;
Fig. 5 is the embodiments of the invention structure chart;
Fig. 6 is embodiments of the invention figure as a result;
Wherein: figure (a) is the eye pattern of the phase shift keyed signal of first Mach of zehnder modulators generation; Figure (b) is the spectrum of the signal of sub-modulator A generation; Figure (c) is the eye pattern of the signal of sub-modulator B generation; Figure (d) is the spectrum of double-parallel modulator output signal; Figure (e) is the eye pattern of up amplitude shift keying signal.
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, for supporting the device of the WDM passive optical network system that double-video service broadcast is distributed, comprising: optical line terminal, a remote node and N optical network unit all is main parts of apparatus of the present invention.Optical line terminal comprises downlink data transmitter, double-video service transmitter and upstream data receiver, and remote node is one second array waveguide grating.Wherein: the output port of downlink data transmitter is connected with the input port of double-video service transmitter; The output of double-video service transmitter is through linking to each other with an input port of second array waveguide grating at remote node place after the Optical Fiber Transmission; Each output port of second array waveguide grating is connected to the input port of each optical network unit of corresponding wavelength channel; Another input port of the output port of optical network unit and second array waveguide grating is connected; 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.
As shown in Figure 2, be downlink data transmitter, comprise N laser, N first signal generator, N first Mach of zehnder modulators, first array waveguide grating.Wherein: the output port of N laser links to each other with the light input end mouth of corresponding first Mach of zehnder modulators respectively.N first signal generator produces N road downstream data traffic, and its output port links to each other with the rf inputs mouth of corresponding first Mach of zehnder modulators respectively.The optical output port of N first Mach of zehnder modulators and the N of first array waveguide grating corresponding input port are connected, and export the N road downstream data traffic of wavelength division multiplexing from the output port of first array waveguide grating.
As shown in Figure 3, be the double-video service transmitter, comprise two flying-spot video generators, a signal source of clock, two parallel Mach zehnder modulators, a counter-rotating NRZ encoder and a frequency mixer.Wherein said two parallel Mach zehnder modulators is made up of two sub-modulators that are integrated on the single chip, and these two sub-modulators have same structure and performance.Each sub-modulator has independently radio-frequency (RF) signal input end mouth and offset port.Also have a main offset port in addition, can be used to regulate the output of two sub-modulators.The output port of first array waveguide grating is connected to the light input end mouth of two parallel Mach zehnder modulators.The clock signal that vision signal that first flying-spot video generator produces and signal source of clock produce is connected respectively to two input ports of frequency mixer, and the output port of frequency mixer is connected with the rf inputs mouth of first sub-modulator of two parallel Mach zehnder modulators; The vision signal that second flying-spot video generator produces is connected to the input port of counter-rotating NRZ encoder, and the output port of counter-rotating NRZ encoder is connected with the rf inputs mouth of second sub-modulator of two parallel Mach zehnder modulators.The optical output port of two parallel Mach zehnder modulators is exported the output signal of two sub-modulators of the two parallel Mach zehnder modulators that closes the road.
As shown in Figure 4, be optical network unit, comprise: optical filter, optical branching device, two video traffic receivers, downlink data receiver and upstream data transmitters, wherein: the light signal of the output of second array waveguide grating connects the input port of optical filter, and two output ports of optical filter are connected respectively to the input port of the first video traffic receiver and optical branching device.Optical branching device has three output ports, and the input port with downlink data receiver, the second video traffic receiver and upstream data transmitter is connected respectively.The output port of upstream data transmitter is connected with the input port of second array waveguide grating.
Described upstream data transmitter, comprise second Mach of zehnder modulators and a secondary signal generator, the input port of second Mach of zehnder modulators links to each other with output port in the optical branching device, and the downstream data traffic that the secondary signal generator produces is connected to the rf inputs mouth of second Mach of zehnder modulators.
As shown in Figure 5, a kind of specific embodiment of the present invention implements to support in the single wavelength channel situation that double-video service transmits.Wavelength is that the light carrier of 1549.89nm is input to first Mach of zehnder modulators, the bias voltage of first Mach of zehnder modulators is about 6.2V, 1.25-Gb/s downlink data be amplified to the peak-to-peak value voltage of about 7.2V through first electric amplifier after, drive first Mach of zehnder modulators, produce phase shift keyed signal (Fig. 6 (a) has provided eye pattern).The output signal of first Mach of zehnder modulators is input to the two parallel Mach zehnder modulators of cascade.1.25-Gb/s first 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, driven element modulator A, its bias voltage is approximately 6.4V, obtains the light double-sideband signal (Fig. 6 (b) has provided spectrum) that light carrier suppresses.1.25-Gb/s second video traffic be connected to counter-rotating NRZ encoder after, be amplified to the peak-to-peak value voltage of about 4V through the 3rd electric amplifier, driven element modulator B, its bias voltage is approximately 4.4V, obtains the phase shift keying light signal and the counter-rotating NRZ signal (Fig. 6 (c) has provided eye pattern) of quadrature.The main bias voltage of regulating two parallel Mach zehnder modulators is about 3.6V, obtains the signal (Fig. 6 (d) has provided spectrum) of zygote modulator A and sub-modulator B.The signal of two parallel Mach zehnder modulators output amplifies with an image intensifer, and suppresses spontaneous emission noise with a tunable optical filter.After 25 kilometers Optical Fiber Transmission, with the signal of an optical filter segregant modulator A and sub-modulator B.The signal of wherein isolated sub-modulator A is sent to the first video traffic receiver and carries out opto-electronic conversion, recovers the first original vision signal; The signal of isolated sub-modulator B is sent to optical branching device, obtains three road signals, and wherein first via signal is sent to the downstream data traffic receiver, recovers original downlink data signal.The second road signal is sent to the second video traffic receiver to carry out, and recovers the second original vision signal.The Third Road signal is input to the 3rd Mach of zehnder modulators, the 3rd Mach of zehnder modulators driven by the upstream data service of 1..25Gb/s, bias voltage is 2.9V, obtain the amplitude shift keying signal (Fig. 6 (e) has provided eye pattern) of uplink, after 25 kilometers Optical Fiber Transmission, enter the upstream data receiver and recover upstream data service.
As shown in Figure 6, for the present invention corresponding to the embodiment of Fig. 5 figure as a result.Wherein: figure (a) is the eye pattern of the phase shift keyed signal of first Mach of zehnder modulators generation, because first amplifier can not be amplified to signal the half-wave voltage of the Mach zehnder modulators of twice, some noises is arranged on the level"1"; Figure (b) is the spectrum of the signal that produces of sub-modulator A, and as can be seen, carrier wave is suppressed fully from the spectrum; Figure (c) is the eye pattern of the signal that produces of sub-modulator B, and as can be seen, eye pattern has good opening width from the eye pattern; Figure (d) is the spectrum of double-parallel modulator output signal, as can be seen, closes in the signal behind the road from the spectrum, and the signal power on the carrier wave is than the high 5-dB of power of two sidebands; Figure (e) is the eye pattern of up amplitude shift keying signal, and as can be seen, eye pattern has good opening width from the eye pattern.
Claims (9)
1. wavelength-division multiplex system of supporting double-video service broadcast distribution, comprise: optical line terminal, a remote node and N optical network unit, it is characterized in that, described optical line terminal comprises downlink data transmitter, double-video service 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 double-video service transmitter, the output of double-video service transmitter is through linking to each other with an input port of second array waveguide grating at remote node place after the Optical Fiber Transmission, each descending output port of second array waveguide grating is connected to the input port of each optical network unit of corresponding wavelength channel, another input port of the output port of optical network unit and second array waveguide grating is connected, and a up output port of second array waveguide grating links to each other by the input port of Optical Fiber Transmission with the upstream data receiver of optical network unit;
Described double-video service transmitter comprises two flying-spot video generators, a signal source of clock, a two parallel Mach zehnder modulators, a counter-rotating NRZ encoder and a frequency mixer, wherein: two parallel Mach zehnder modulators are made up of two sub-modulators, the output port of first array waveguide grating is connected to the light input end mouth of two parallel Mach zehnder modulators, the clock signal that vision signal that first flying-spot video generator produces and signal source of clock produce is connected respectively to two input ports of frequency mixer, the output port of frequency mixer is connected with the rf inputs mouth of first sub-modulator of two parallel Mach zehnder modulators, the vision signal that second flying-spot video generator produces is connected to the input port of counter-rotating NRZ encoder, the output port of counter-rotating NRZ encoder is connected with the rf inputs mouth of second sub-modulator of two parallel Mach zehnder modulators, and the optical output port of two parallel Mach zehnder modulators is exported the output signal of two sub-modulators of the two parallel Mach zehnder modulators that closes the road.
2. the wavelength-division multiplex system of support double-video service broadcast distribution according to claim 1, it is characterized in that, described downlink data transmitter produces the downstream data traffic of N road wavelength division multiplexing, described downlink data transmitter comprises N laser, N first signal generator, N first Mach of zehnder modulators, described first array waveguide grating, wherein: the output port of N laser links to each other with the light input end mouth of corresponding first Mach of zehnder modulators respectively, N first signal generator produces N road downstream data traffic, its output port links to each other with the rf inputs mouth of corresponding first Mach of zehnder modulators respectively, the optical output port of N first Mach of zehnder modulators and the N of first array waveguide grating corresponding input port are connected, and export the N road downstream data traffic of wavelength division multiplexing from the output port of first array waveguide grating.
3. the wavelength-division multiplex system of support double-video service broadcast distribution according to claim 1, it is characterized in that, described two parallel Mach zehnder modulators, form by described two the sub-modulators that are integrated on the single chip, these two sub-modulators have same structure and performance, each sub-modulator has independently described rf inputs mouth and offset port, also has a main offset port in addition, is used for regulating the output of two sub-modulators.
4. the wavelength-division multiplex system of support double-video service broadcast distribution according to claim 1, it is characterized in that, described optical network unit, comprise: optical filter, optical branching device, two video traffic receivers, downlink data receiver and upstream data transmitter, wherein: the light signal of described second array waveguide grating output connects the input port of optical filter, two output ports of optical filter are connected respectively to the input port of the first video traffic receiver and optical branching device, optical branching device has three output ports, respectively with the downlink data receiver, the input port of the second video traffic receiver and upstream data transmitter is connected, and the output port of upstream data transmitter is connected with the input port of second array waveguide grating.
5. the wavelength-division multiplex system of support double-video service broadcast distribution according to claim 4, it is characterized in that, described upstream data transmitter, comprise second Mach of zehnder modulators and a secondary signal generator, the input port of second Mach of zehnder modulators links to each other with a output port in the optical branching device, and the upstream data service that the secondary signal generator produces is connected to the rf inputs mouth of second Mach of zehnder modulators.
6. a wavelength division multiplexing method of supporting the double-video service broadcast distribution is characterized in that, comprises following concrete steps:
Step 1 at optical line terminal, all is biased in the minimum point of its transmission curve with first Mach zehnder modulators of N, produces phase shift keyed signal, therefore produces the downstream data traffic of N wavelength-channels;
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 first array waveguide grating;
Step 3, downlink data signal after synthetic one tunnel is sent to the double-video service transmitter, by the modulation of two parallel Mach zehnder modulators, first sub-modulator of wherein two parallel Mach zehnder modulators drives with first vision signal of subcarrier multiplexing, be biased in the minimum point of transmission curve, obtain the light double-sideband carrier suppressed signal of wavelength division multiplexing, second sub-modulator of two parallel Mach zehnder modulators uses second video traffic after the counter-rotating NRZ encoder encodes to drive, be biased in the centre position of transmission curve, obtain the phase shift keying light signal and the counter-rotating NRZ signal of the quadrature behind the wavelength division multiplexing;
Step 4, by regulating the main bias point of double-parallel modulator, the output addition of two sub-modulators of feasible two parallel Mach zehnder modulators, first sub-modulator output be the signal of carrier suppressed, and second sub-modulator output is the signal that is positioned on the carrier wave, can not interfere between them;
Step 5, the light signal of the wavelength division multiplexing of double-parallel modulator output by the second array waveguide grating demultiplexing, obtains the light signal of N wavelength-channels at remote node, and the light signal on each wavelength-channels is routed to optical network unit separately then;
Step 6, at each optical network unit, isolate signal and second signal that sub-modulator is exported of first sub-modulator output of two parallel Mach zehnder modulators with an optical filter, wherein the signal of first sub-modulator output is delivered to the first video traffic receiver and is recovered first video traffic; And the signal of second sub-modulator output is divided into three the tunnel by optical branching device;
Step 7, be divided into second signal that sub-modulator is exported of three tunnel, the first via is delivered to the downlink data receiver and is recovered downstream data traffic, the second the tunnel is input to the second video traffic receiver recovers second video traffic, Third Road is input to the upstream data transmitter, and by second Mach of zehnder modulators modulation, upstream data service drives second Mach of zehnder modulators, be biased in the centre position of transmission curve, obtain up amplitude shift keying light signal;
Step 8, up amplitude shift keying light signal, is received by the upstream data receiver to optical line terminal through Optical Fiber Transmission, recovers upstream data service.
7. the wavelength division multiplexing method of support double-video service broadcast distribution according to claim 6 is characterized in that in the step 2, described first array waveguide grating can carry out wavelength division multiplexing, with the light signal synthetic a tunnel of N wavelength-channels; Or the light signal behind the wavelength division multiplexing carried out demultiplexing, obtain the light signal of N wavelength-channels.
8. the wavelength division multiplexing method of support double-video service broadcast distribution according to claim 6, it is characterized in that, in the step 3, first vision signal of described subcarrier multiplexing, the clock signal that is produced by the vision signal and the signal source of clock of first flying-spot video generator output is carried out mixing by electric frequency mixer and is obtained.
9. the wavelength division multiplexing method of support double-video service broadcast distribution according to claim 6, it is characterized in that, in the described step 3, what second sub-modulator of two parallel Mach zehnder modulators exported is the phase shift keying light signal and the counter-rotating NRZ signal of quadrature, phase shift keyed signal is a phase modulation format, on " 1 " of counter-rotating NRZ signal and the level "0" power is arranged all, therefore the phase shift keyed signal of quadrature and counter-rotating NRZ signal can be obtained the amplitude shift keying light signal by intensity modulated.
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| EP1670280A2 (en) * | 2004-12-08 | 2006-06-14 | Alcatel | Internet protocol video delivery in passive optical networks |
| CN1916698A (en) * | 2006-09-01 | 2007-02-21 | 清华大学 | Method for polarized quadrature modulating optical label based on residual sideband |
| 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 |
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