CN101944967B - Device for bearing and transmitting point-to-point service, multicasting service, and broadcasting service - Google Patents
Device for bearing and transmitting point-to-point service, multicasting service, and broadcasting service Download PDFInfo
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Abstract
The invention relates to a device for bearing and transmitting a point-to-point service, a multicasting service and a broadcasting service. An optical line terminal (OLT) comprises a plurality of light sources CW with different wavelengths; a Mach-Zehnder modulator 1 (MZM1) is connected with the rear part of each light source; a radio frequency signal (RF) and an electric signal Data are performed with electric domain frequency mixing through a multiplier so as to be added with an electric signal Video through a summator, and is used for driving each MZM1; and the each electric signal is performed with wavelength division multiplexing through an arrayed waveguide grating (AWG), and is shunted and then combined by two interleavers, the downlink data is transmitted to a remote node (RN) through an optical fiber. The device of the invention adopts a new-type modulating manner of single modulator and double data, and realizes simultaneously generating the transmitting the point to the point service, the multicasting service and the broadcasting service based on the modulating manner, and (n+1) numbered MZMs 1 are only used at a transmitting end, thus greatly lowering the system cost and satisfying the requirements of multiple services.
Description
Technical field
The present invention relates to the device of bearer service in the optical communication technique field, is a kind of device that transmits point to point service, PTP, multicast service and broadcasting service that carries specifically.Device of the present invention can produce and transmit point to point service, PTP (P2P service), multicast service (multicastservice) and broadcasting service (broadcast service) simultaneously, is applicable to speed fiber optic communication systems and network.
Background technology
Along with the development of the universal and multimedia service of Fast Ethernet, people have higher requirement to the existing message capacity that can support based on the optical fiber telecommunications system of wavelength division multiplexing (WDM) technology.Simultaneously, utilize existing low cost optical device, passive optical network (PON) has become because of its simple in structure and low in cost the tempting scheme that the user realizes broadband access.
Traditionally, passive optical network adopts tree topology, a long optical fibers is passed through to remote node RN transferring service in optical line terminal (OLT) or central office, at remote node, luminous power is also further transferred to each optical network unit (ONU) along separate routes, and each optical network unit ONU can provide service for a plurality of users.
Like this, in academia and technical field, Wave division multiplexing passive optical network (WDM-PON) has just been proposed.Since this concept was suggested, due to potential use value, it always was the focus that people study.Progress along with Internet technology, people no longer have been confined to web page browsing to the business demand of network, point to point service, PTP, demand (telecommunication) service and advertising business constantly increase, and so just need a kind of network configuration can support simultaneously point to point service, PTP, multicast service and broadcasting service.But up to the present, the WDM-PON network of commercialization can only transmit point to point service, PTP, and in the researcher is studying and delivering document or patent, also can only realize the combination of point to point service, PTP and broadcasting service both at home and abroad; The perhaps combination of point to point service, PTP and multicast service.Also do not have a kind of device can realize producing simultaneously and transmitting the network function of these three kinds of business.
Through the prior art literature search is found, a kind of like this technology is arranged in Wave division multiplexing passive optical network, be published in the article " A WDM-PON with 10-Gb/s Symmetric Bit-Rates andMulticast Overlay with Delay-based Multicast Control " of Optical Fiber Communication Conference 2009, this technology utilizes IRZ/PSK (oppositely NRZ/phase shift keying) quadrature modulation pattern to realize point to point service, PTP and multicast service.Concretely, with the time delay between adjustable delay time circuit control IRZ (oppositely NRZ) signal and PSK (phase shift keying) signal, when the time delay when between the two is 0, receiving terminal can receive IRZ signal and two kinds of data of psk signal simultaneously, and when between the two time delay is 0.5bit, receiving terminal can only receive the IRZ signal, and psk signal can not be correctly received; Thereby realize the function of multicast by controlling adjustable delay circuit.There is certain problem in this technical scheme: at first, accurate time-delay is difficult to obtain, and will affect receptivity like this, and the delay circuit more complicated; In addition, regulating time delay needs the regular hour, so the realization of multicast is not real-time; If last this technical scheme is used for the wavelength-division multiplex system of n wavelength and just needs to use 2n Mach zehnder modulators, system is economical not, and cost is higher.
Be published in the article " Simultaneous Transmission of Point-to-Point Data andSelective Delivery of Video Services in a WDM-PON Using ASK/SCMModulation Format " of Optical Fiber Communication Conference 2008, mention a kind of quadrature modulation mode based on ASK/ASK (amplitude keying/amplitude keying), realize point to point service, PTP and multicast service.Specifically, the delustring of controlling ASK (amplitude keying) signal recently realizes the function of multicast, when the extinction ratio of ASK signal is 5dB, receiving terminal can receive point to point service, PTP and multicast service simultaneously, and when the extinction ratio of ASK signal is 10dB, receiving terminal can only receive point to point service, PTP, can not receive multicast service, thereby realizes the function of multicast.But this technology also exists great limitation: (1) has used two Mach zehnder modulators to realize two kinds of business functions to each wavelength, therefore just needs 2n Mach zehnder modulators for n wavelength, and cost is higher.(2) two kinds of orthogonal demodulation signals are all ASK, influence each other, and have reduced the performance of system.(3) be difficult to accurate control extinction ratio, and the control of extinction ratio can not be real-time.
From the above, in disclosed document, although the device that transmits simultaneously point to point service, PTP and multicast service is arranged in prior art, but they have the shortcomings and limitations of himself, and in existing technical scheme, to each wavelength, often need at least two (that is: two or more) Mach zehnder modulators, therefore for the WDM network of n wavelength multiplexing, just need 2n or 2n above Mach zehnder modulators and complicated circuit control unit, increase cost and the complexity of system.
Summary of the invention
For the defective that exists in prior art, the object of the present invention is to provide a kind of device that transmits point to point service, PTP, multicast service and broadcasting service that carries, adopt the new type of modulation mode of single-stage modulator Double Data, and realized producing simultaneously and transmitting point to point service, PTP, multicast service and broadcasting service based on this modulation system.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind of device that transmits point to point service, PTP, multicast service and broadcasting service that carries comprises optical line terminal OLT, far-end node RN and three parts of optical network unit ONU, it is characterized in that:
In optical line terminal OLT, comprise a plurality of different wave lengths source CW, light source CW is corresponding one by one with the wavelength of light signal, Mach zehnder modulators MZM1 of each light source CW back connection,
After radiofrequency signal RF carries out the mixing of electric territory with the signal of telecommunication Data that is used for point-to-point service by multiplier, signal of telecommunication Data data are positioned on the RF spectrum component, and then carry out addition with the signal of telecommunication Video that is used for multicast service by adder, make point-to-point service separate with multicast service frequency spectrum on electric territory, drive each Mach zehnder modulators MZM1 with it again
The multichannel different wave length signal that is produced by a plurality of light source CW is through with it one to one after Mach zehnder modulators MZM1, by the array waveguide grating AWG wavelength division multiplexing of same OLT side,
By two interpolater INT, light signal is first carried out shunt again and close again the road, a Mach zehnder modulators MZM2 is set separately between two interpolater INT;
Finally by crossing optical fiber, downlink data is sent in array waveguide grating AWG corresponding with downlink data in far-end node RN.
On the basis of technique scheme, in optical line terminal OLT, also comprise the upstream data receiving system, described upstream data receiving system comprises some photoelectric detector PD;
In optical line terminal OLT, array waveguide grating AWG with an OLT side receives the upstream data of sending through optical fiber specially, array waveguide grating AWG sends into the upstream data of different wave length respectively in the photoelectric detector PD corresponding with it, and photoelectric detector PD is completed the upstream data demodulating process.
On the basis of technique scheme, in far-end node RN, comprise two array waveguide grating AWG,
An array waveguide grating AWG is used for the transmission of downlink data, the transmission of downlink data is the process of an one-to-many, it is multiplexing that array waveguide grating AWG carries out Wave Decomposition with descending wavelength division multiplexing data, and the signal of different wave length is delivered in corresponding ONU unit in order to receive;
An array waveguide grating AWG is used for the transmission of upstream data, and the transmission of upstream data is a many-to-one process; Array waveguide grating AWG carries out wavelength division multiplexing with the different wave length signal in different ONU unit, and the wavelength division multiplexing data are delivered in optical line terminal OLT, realizes realizing with same optical fiber the transmission of different wave length data.
On the basis of technique scheme, in optical network unit ONU, comprise the filter Filter that receives the downlink data that in far-end node RN, array waveguide grating AWG sends,
The road output of filter Filter is sent into multicast service signal of telecommunication Video demodulator and is extracted multicast service,
Another road output of filter Filter is sent into first splitter coupler and is divided into two-way, wherein one the tunnel send into second splitter coupler and again be divided into two-way, up modulation Mach zehnder modulators MZM3 used is sent on another road, up modulation Mach zehnder modulators MZM3 used sends to upstream data upstream Data in array waveguide grating AWG corresponding with upstream data in far-end node RN by optical fiber
Send into broadcasting service signal of telecommunication Broadcast demodulator through second splitter coupler circuit-switched data along separate routes and extract broadcasting service,
Send into point to point service, PTP signal of telecommunication Data demodulator through second splitter coupler another circuit-switched data along separate routes and extract point to point service, PTP.
On the basis of technique scheme, described point to point service, PTP signal of telecommunication Data demodulator carries out cascade to a Mach-Zehnder interferometer MZDI and a photoelectric detector PD exactly, realizes the extraction of point to point service, PTP data from first harmonic.
On the basis of technique scheme, described broadcasting service signal of telecommunication Broadcast demodulator is exactly a high-speed photodetector PD, realizes that the Broadcast data of first harmonic component are extracted.
On the basis of technique scheme, described multicast service signal of telecommunication Video demodulator carries out cascade to a Mach-Zehnder interferometer MZDI and a photoelectric detector PD exactly, realizes the extraction of multicast business datum.
On the basis of technique scheme, light source CW is continuous wave light source, for generation of the different wave length signal.
On the basis of technique scheme, described signal of telecommunication Data represents point-to-point service, the signal of telecommunication Data that each wavelength is corresponding is different, signal of telecommunication Video represents multicast service, the signal of telecommunication Video that each wavelength is corresponding can be the same or different, signal of telecommunication Data and radiofrequency signal RF carry out the mixing of electric territory, and then carry out addition with signal of telecommunication Video, and the signal that obtains is used for driving the Mach zehnder modulators.
On the basis of technique scheme, the Mach zehnder modulators MZM1 that connects each light source CW is used for the signal of telecommunication is modulated to light signal, wherein the bias point of modulator is positioned at the minimum point of adjustment curve, and signal of telecommunication Data and signal of telecommunication Video will produce the two-phase PSK bpsk signal on the different frequency of light signal like this.
Carrying of the present invention transmits the device of point to point service, PTP, multicast service and broadcasting service, adopted the new type of modulation mode of single-stage modulator Double Data, and point to point service, PTP, multicast service and broadcasting service have been realized producing simultaneously and transmitting based on this modulation system, only used n+1 Mach zehnder modulators (n is the wave number of wavelength division multiplexing) at transmitting terminal, so system cost reduces greatly, and satisfied multiple services demand; This device can realize that terminal use and end office (EO) carry out uplink communication by uplink service in addition, and does not use the annex light source at user side, has further reduced cost.The present invention compared with prior art has the following advantages:
(1) realize several functions with less modulator, cost is lower.
(2) control by simple switch the break-make of completing multicast service, realize simple and have real-time.
(3) can carry out multicast with gate and control, have real use value.
(4) each spectrum component is utilized, and the availability of frequency spectrum is high.
Description of drawings
The present invention has following accompanying drawing:
Fig. 1 is based on the Double Data modulation format schematic diagram of single modulator,
Fig. 2 BPSK/ASK quadrature modulation form schematic diagram,
Fig. 3 structural representation of the present invention,
Fig. 4 embodiment of the present invention schematic diagram 1,
Fig. 5 embodiment of the present invention schematic diagram 2,
Fig. 6 embodiment of the present invention is Fig. 3 as a result.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention relates to technical field of optical fiber communication, described carrying transmits the device of point to point service, PTP, multicast service and broadcasting service, can produce simultaneously and transmit point to point service, PTP, multicast service and broadcasting service, as shown in Figure 3, comprise optical line terminal OLT, far-end node RN and three parts of optical network unit ONU
In far-end node RN, comprise two array waveguide grating AWG,
An array waveguide grating AWG is used for the transmission of downlink data, the transmission of downlink data is the process of an one-to-many, it is multiplexing that array waveguide grating AWG carries out Wave Decomposition with descending wavelength division multiplexing data, and the signal of different wave length is delivered in corresponding ONU unit in order to receive;
An array waveguide grating AWG is used for the transmission of upstream data, and the transmission of upstream data is a many-to-one process; Array waveguide grating AWG carries out wavelength division multiplexing with the different wave length signal in different ONU unit, and the wavelength division multiplexing data are delivered in optical line terminal OLT, realizes realizing with same optical fiber the transmission of different wave length data.
In optical line terminal OLT, comprise a plurality of different wave lengths source CW, light source CW is corresponding one by one with the wavelength of light signal, Mach zehnder modulators MZM1 of each light source CW back connection,
After radiofrequency signal RF carries out the mixing of electric territory with the signal of telecommunication Data that is used for point-to-point service by multiplier, signal of telecommunication Data data are positioned on the RF spectrum component, and then carry out addition with the signal of telecommunication Video that is used for multicast service by adder, make point-to-point service separate with multicast service frequency spectrum on electric territory, drive each Mach zehnder modulators MZM1 with it again
The multichannel different wave length signal that is produced by a plurality of light source CW is through with it one to one after Mach zehnder modulators MZM1, array waveguide grating AWG wavelength division multiplexing by same OLT side, the array waveguide grating AWG of described OLT side is used for carrying out different wavelength multiplexing, thereby realize the function of wavelength division multiplexing
By two interpolater INT (Interlevel), light signal is first carried out shunt again and close again the road, a Mach zehnder modulators MZM2 is set separately between two interpolater INT; Described two interpolater INT are used for the optical carrier on each wavelength is separated with sub-carrier signal, and then make up, the purpose of doing like this is: the part of primary light signal is obtained orthogonal signalling by modulating again, and another part does not carry out any processing, the purpose of then closing the road is that two parts are transmitted simultaneously, two parts of signals only needs an optical fiber just can complete transmission like this, and the various damages of experiencing in transmitting procedure are also identical, are convenient to the processing of receiving terminal; Described Mach zehnder modulators MZM2 is used for carrying out quadrature modulation on subcarrier, thereby broadcast singal is carried on each road signal,
Finally by crossing optical fiber, downlink data is sent in array waveguide grating AWG corresponding with downlink data in far-end node RN;
The upstream data receiving system comprises some photoelectric detector PD; In optical line terminal OLT, array waveguide grating AWG with an OLT side receives the upstream data of sending through optical fiber specially, array waveguide grating AWG sends into the upstream data of different wave length respectively in the photoelectric detector PD corresponding with it, and photoelectric detector PD is completed the upstream data demodulating process.Therefore in optical line terminal OLT, have the array waveguide grating AWG of two OLT sides.
In optical network unit ONU, comprise the filter Filter that receives the downlink data that in far-end node RN, array waveguide grating AWG sends, described filter Filter is used for the baseband signal of each wavelength channel is separated with first harmonic, thereby carries out the demodulation of back
The road output of filter Filter is sent into multicast service signal of telecommunication Video demodulator and is extracted multicast service,
Another road output of filter Filter is sent into first splitter coupler and is divided into two-way, wherein one the tunnel send into second splitter coupler and again be divided into two-way, up modulation Mach zehnder modulators MZM3 used is sent on another road, up modulation Mach zehnder modulators MZM3 used sends to upstream data upstream Data in array waveguide grating AWG corresponding with upstream data in far-end node RN by optical fiber
Send into broadcasting service signal of telecommunication Broadcast demodulator through second splitter coupler circuit-switched data along separate routes and extract broadcasting service,
Send into point to point service, PTP signal of telecommunication Data demodulator through second splitter coupler another circuit-switched data along separate routes and extract point to point service, PTP.
On the basis of technique scheme, light source CW is continuous wave light source, for generation of the different wave length signal.
On the basis of technique scheme, described signal of telecommunication Data represents point-to-point service, the signal of telecommunication Data that each wavelength is corresponding is different, signal of telecommunication Video represents multicast service, the signal of telecommunication Video that each wavelength is corresponding can be the same or different, signal of telecommunication Data and radiofrequency signal RF carry out the mixing of electric territory, and then carry out addition with signal of telecommunication Video, and the signal that obtains is used for driving the Mach zehnder modulators.
On the basis of technique scheme, the Mach zehnder modulators MZM1 that connects each light source CW is used for the signal of telecommunication is modulated to light signal, wherein the bias point of modulator is positioned at the minimum point of adjustment curve, and signal of telecommunication Data and signal of telecommunication Video will produce the two-phase PSK bpsk signal on the different frequency of light signal like this.
On the basis of technique scheme, described point to point service, PTP signal of telecommunication Data demodulator (point to point service, PTP signal of telecommunication Data receiving system), exactly a Mach-Zehnder interferometer MZDI and a photoelectric detector PD are carried out cascade, realize the extraction of point to point service, PTP data from first harmonic.
On the basis of technique scheme, described broadcasting service signal of telecommunication Broadcast demodulator (broadcasting service signal of telecommunication Broadcast receiving system) is exactly a high-speed photodetector PD, realizes that the Broadcast data of first harmonic component are extracted.
On the basis of technique scheme, described multicast service signal of telecommunication Video demodulator (multicast service signal of telecommunication Video receiving system), exactly a Mach-Zehnder interferometer MZDI and a photoelectric detector PD are carried out cascade, realize the extraction of multicast (mult icast) business datum.
Operation principle of the present invention is as follows:
After Data and radiofrequency signal RF carried out the mixing of electric territory, the Data data were positioned on the RF spectrum component, then carried out addition with Video, and such two kinds of business frequency spectrum on electric territory separates.Then the optical signal spectrum that obtains by electrooptic modulation also separates, and namely two kinds of business are positioned on different spectrum components, can not produce interference.
Take modulator MZM1 as example, by regulating the bias point of modulator MZM1, can realize that Data and Video are the data format of BPSK.By simple opening and closing Video data, just can realize the selectivity transmission of multicast service.Then realize that with Interlevel frequency spectrum separates, again subcarrier components is carried out quadrature modulation, and broadcasting service (Broadcastservice) is modulated on subcarrier components by modulator MZM2, it is the ASK data format that the adjusting bias point makes Broadcast, has so just realized the quadrature modulation of BPSK/ASK.
Have because the Data data are each wavelength channels, so broadcast also can be in each channel, thereby realized the function of broadcasting service.And the light carrier component that is loaded with Video information remains unchanged.After one section Optical Fiber Transmission, light signal is realized demultiplexing at far-end node RN, and then the signal of corresponding wavelength enters corresponding ONU unit, realizes data receiver.
In each ONU, at first carry out frequency spectrum with filter and separate, obtain light carrier component and subcarrier components, the light carrier component can obtain multicast service Video by the BPSK receiving system, but only have those users that order this business just can receive, other users are not all right.This function just can realize having advantages of real-time and simplicity as long as carry out simple switch control at the OLT end.And subcarrier components is divided into three parts, and first enters BPSK receiving system unit and obtains point to point service, PTP Data, and second portion enters the ASK receiving system and obtains broadcasting service Broadcast service.Third part is modulated to upstream data in up link by modulator as up-link carrier, and realizes receiving at the OLT end.Because do not use the annex light source in ONU, so realized passive ONU, system cost and complexity have been reduced.
The present invention is by Double Data modulation format and BPSK/ASK orthogonal modulation technique, use less modulator and simple structure to realize transmitting simultaneously the function of point to point service, PTP, multicast service and broadcasting service, thereby satisfied user's multiservice requirement, and easy operating, with low cost.
Fig. 1 is the Double Data modulation format schematic diagram based on single modulator, a key technology of the present invention just is based on the Double Data modulation format of single modulator: it is the continuous wave of 193.1THz that laser TuableLaser 1 produces frequency, this continuous wave carries out electrooptic modulation through Mach zehnder modulators MZM 2, the electricity of described Mach zehnder modulators drives as follows and produces: Data1 and 10G radiofrequency signal RF carry out the mixing of electric territory through frequency mixer 3, and then carry out addition with Data2 through adder 4, at last the later signal of addition is amplified through electric amplifier 5.After ovennodulation, Data1 is modulated onto on subcarrier, and Data2 still is positioned on light carrier.
Regulate the bias point of modulator, be located at the minimum point of adjustment curve, like this can be so that Data1 and Data2 be the BPSK data format.When needs carry out data receiver, separate as long as carry out frequency spectrum by filter Filter6, obtain light carrier frequency spectrum and subcarrier spectrum, then each spectrum component is carried out the BPSK differential ference spiral and get final product.The demodulating process of BPSK is as follows: bpsk signal is passed through Mach-Zehnder interferometer MZDI 7, and then just can recover the signal of telecommunication by photoelectric detector PD 8.
As shown in Figure 2, another key technology of the present invention just is based on BPSK/ASK quadrature modulation form: laser Tuable Laser 1 produces a branch of continuous wave, this continuous wave carries out the BPSK modulation through Mach zehnder modulators MZM12, specifically, Data1 obtains peak-to-peak value (peak-to-peak value refers to peak to the voltage difference between minimum point) through electric amplifier and is the signal of telecommunication of 2Vpi, then come driven modulator with this signal of telecommunication, the bias point of modulator is positioned at the minimum point of adjustment curve.Then the light signal input modulator MZM24 with the BPSK modulation format is carried out the ASK modulation, specifically, Data2 obtains through electric amplifier 3 signal of telecommunication that peak-to-peak value is 0.75Vpi, can obtain like this ASK signal of limited extinction ratio, then drive modulation with this signal of telecommunication, the bias point of modulator is positioned at the intermediate point of adjustment curve.Just can obtain the quadrature modulation form of BPSK/ASK through modulation as above.Because the signal of Data1 represents with phase place, and the signal of Data2 is to represent with intensity, therefore both can not produce aliasing.Receiving course is as follows, and the signal after modulation is divided into two, and wherein a part directly by photoelectric detector PD 5, can obtain ASK signal Data2; Another part just can obtain bpsk signal Data1 by MZDI 6 through photoelectric detector PD 7.
As shown in Figure 3, the Wave division multiplexing passive optical network that proposes in the present invention is divided into three parts, optical line terminal OLT, far-end node RN, a plurality of optical network unit ONU.In OLT, a plurality of different wavelength light sources are arranged, the corresponding link of each wavelength, the light signal of each wavelength is modulated through the Double Data modulation format, after ovennodulation, point to point service, PTP Data is positioned on subcarrier, and multicast service Video is positioned on light carrier, and these two kinds of business are all the form carry informations with BPSK.Then the road of each after ovennodulation signal carries out wavelength division multiplexing by AWG.Through after Interlevel, the light carrier of each wavelength has obtained separating with subcarrier, wherein all subcarrier components are all carried out the ASK modulation by modulator MZM2, and broadcasting service just is loaded on all wavelengths channel by the mode of BPSK/ASK quadrature modulation like this, realize the function of broadcasting.After one section spread fiber, by the AWG demultiplexing, then each wavelength enters corresponding ONU unit to wavelength-division multiplex signals at far-end node RN.Realize the reception of multiple business and the modulation of upstream data in each ONU unit, be implemented as follows: receive to such an extent that signal carries out carrier separation with a filter, be divided into light carrier component and subcarrier components, the light carrier component contains multicast service Video, because modulation format is BPSK, so just can obtain the Video business by MZDI and photodetector, it should be noted that, this business is to need to order, namely only have the user who orders this business just can receive, other users are not all right.The realization of this function is also very simple, as long as at the OLT end, selects to open the Video business at some wavelength channel (respective user unit), and this business of other channel offs gets final product.For subcarrier components, it has been divided into three parts, photoelectric detector PD is directly passed through by first, can obtain the broadcasting service broadcast of ASK modulation format, second portion can obtain BPSK modulation format point to point service, PTP Data by MZDI and photoelectric detector PD, and third part is used for as up-link carrier, by MZM3, upstream data is modulated on up-link carrier, realize the transmission of upstream data, at the OLT end, with photodetector, upstream data is received.Because the ONU unit does not use additional source of light, so realized passive ONU, not only simplified system, also saved greatly the cost of system.
As shown in Figure 4, demonstrated by experiment in the situation that open Video, transmitted simultaneously point to point service, PTP Data and multicast service Video.Tunable light source produces the continuous wave CW of wavelength 1550.1nm, carry out electrooptic modulation through entering a Mach zehnder modulators MZM after Polarization Controller, data transfer rate is that the Data1 of 1.25Gbit/s represents point to point service, PTP, and data transfer rate is that the Data2 of 1.25Gbit/s represents multicast service; Be loaded with Data2 on light carrier after ovennodulation, and be loaded with Data1 on subcarrier, spectrogram is as shown in Fi g (1).After the 25km Optical Fiber Transmission, light signal arrives receiving terminal.At first by filter, frequency spectrum is divided into light carrier component and subcarrier components, frequency spectrum is as shown in Fig (2) and Fig (3).Obtain Data2 after light carrier component process MZDI and photoelectric detector PD, eye pattern is as shown in Fig (4).Also through obtaining Data1 after MZDI and photoelectric detector PD, eye pattern is as shown in Fig (5) for subcarrier components.So just realized transmitting simultaneously the function of multicast service and point to point service, PTP.
As shown in Figure 5, demonstrated by experiment in the situation that close Video, transmit the continuous wave CW that point to point service, PTP Data and multicast service Video. tunable light source produce wavelength 1550.1nm, carry out electrooptic modulation through entering a Mach zehnder modulators MZM after Polarization Controller, data transfer rate is that the Data1 of 1.25Gbit/s represents point to point service, PTP, and data transfer rate is that the Data2 of 1.25G represents multicast service; It is in closed condition.After ovennodulation, can find out from spectrogram Fig (1), light carrier and subcarrier rejection ratio reach 5dB, there is no data on light carrier, and are loaded with Data1 on subcarrier.After the 25km Optical Fiber Transmission, light signal arrives receiving terminal.At first by filter, frequency spectrum is divided into light carrier component and subcarrier components, frequency spectrum is as shown in Fi g (2) and Fi g (3).Can not get any data after light carrier component process MZDI and photoelectric detector PD, just in time be in off-state with Video and match.Obtain Data1 after subcarrier components process MZDI and photoelectric detector PD, eye pattern is as shown in Fig (4).Like this, in the situation that Video disconnects, receiving terminal just can not receive multicast service, and point to point service, PTP is unaffected, thereby has realized the function of multicast.
As shown in Figure 6, this example has been demonstrated the function of transmitting uplink data of the present invention, remain unchanged at transmitting terminal, wavelength is after the continuous wave of 1550.1nm is modulated through the Double Data form, transmission 25km after being amplified by erbium-doped optical fiber amplifier EDFA, arrive receiving terminal, receiving terminal is through after filtering, obtain subcarrier components, the eye pattern of subcarrier components is as shown in Fig (1), and it represents a bpsk signal, corresponding frequency spectrum is as shown in Fig (2), can find out from frequency spectrum, subcarrier has good rejection ratio, can be used as the carrier wave of up link.After the MZM modulators modulate, upstream data Data3 is modulated onto on up-link carrier.Then through after the 25km transmission, upstream data is received, and the eye pattern that obtains is as shown in Fig (3), and this eye diagram quality is fine, can obtain the performance without error code fully.
Claims (10)
1. one kind carries the device that transmits point to point service, PTP, multicast service and broadcasting service, comprises optical line terminal OLT, far-end node RN and three parts of optical network unit ONU, it is characterized in that:
In optical line terminal OLT, comprise a plurality of different wave lengths source CW, light source CW is corresponding one by one with the wavelength of light signal, Mach zehnder modulators MZM1 of each light source CW back connection,
After radiofrequency signal RF carries out the mixing of electric territory with the signal of telecommunication Data that is used for point-to-point service by multiplier, signal of telecommunication Data data are positioned on the RF spectrum component, and then carry out addition with the signal of telecommunication Video that is used for multicast service by adder, make point-to-point service separate with multicast service frequency spectrum on electric territory, again with removing to drive each Mach zehnder modulators MZM1 through the signal that obtains after adder
The multichannel different wave length signal that is produced by a plurality of light source CW is through with it one to one after Mach zehnder modulators MZM1, by the array waveguide grating AWG wavelength division multiplexing of same OLT side,
By two interpolater INT, light signal is first carried out shunt again and close again the road, a Mach zehnder modulators MZM2 is set separately between two interpolater INT;
Finally by crossing optical fiber, downlink data is sent in array waveguide grating AWG corresponding with downlink data in far-end node RN.
2. carrying as claimed in claim 1 transmits the device of point to point service, PTP, multicast service and broadcasting service, and it is characterized in that: in optical line terminal OLT, also comprise the upstream data receiving system, described upstream data receiving system comprises some photoelectric detector PD;
In optical line terminal OLT, array waveguide grating AWG with an OLT side receives the upstream data of sending through optical fiber specially, array waveguide grating AWG sends into the upstream data of different wave length respectively in the photoelectric detector PD corresponding with it, and photoelectric detector PD is completed the upstream data demodulating process.
3. carrying as claimed in claim 2 transmits the device of point to point service, PTP, multicast service and broadcasting service, it is characterized in that: in far-end node RN, comprise two array waveguide grating AWG,
An array waveguide grating AWG is used for the transmission of downlink data, the transmission of downlink data is the process of an one-to-many, it is multiplexing that array waveguide grating AWG carries out Wave Decomposition with descending wavelength division multiplexing data, and the signal of different wave length is delivered in corresponding ONU unit in order to receive;
An array waveguide grating AWG is used for the transmission of upstream data, and the transmission of upstream data is a many-to-one process; Array waveguide grating AWG carries out wavelength division multiplexing with the different wave length signal in different ONU unit, and the wavelength division multiplexing data are delivered in optical line terminal OLT, realizes realizing with same optical fiber the transmission of different wave length data.
4. carrying as claimed in claim 3 transmits the device of point to point service, PTP, multicast service and broadcasting service, it is characterized in that: in optical network unit ONU, comprise the filter Filter that receives the downlink data that in far-end node RN, array waveguide grating AWG sends,
The road output of filter Filter is sent into multicast service signal of telecommunication Video demodulator and is extracted multicast service,
Another road output of filter Filter is sent into first splitter coupler and is divided into two-way, wherein one the tunnel send into second splitter coupler and again be divided into two-way, up modulation Mach zehnder modulators MZM3 used is sent on another road, up modulation Mach zehnder modulators MZM3 used sends to upstream data upstream Data in array waveguide grating AWG corresponding with upstream data in far-end node RN by optical fiber
Send into broadcasting service signal of telecommunication Broadcast demodulator through second splitter coupler circuit-switched data along separate routes and extract broadcasting service,
Send into point to point service, PTP signal of telecommunication Data demodulator through second splitter coupler another circuit-switched data along separate routes and extract point to point service, PTP.
5. carrying as claimed in claim 4 transmits the device of point to point service, PTP, multicast service and broadcasting service, it is characterized in that: described point to point service, PTP signal of telecommunication Data demodulator, exactly a Mach-Zehnder interferometer MZDI and a photoelectric detector PD are carried out cascade, realize the extraction of point to point service, PTP data from first harmonic.
6. carrying as claimed in claim 4 transmits the device of point to point service, PTP, multicast service and broadcasting service, it is characterized in that: described broadcasting service signal of telecommunication Broadcast demodulator, be exactly a high-speed photodetector PD, realize that the Broadcast data of first harmonic component are extracted.
7. carrying as claimed in claim 4 transmits the device of point to point service, PTP, multicast service and broadcasting service, it is characterized in that: described multicast service signal of telecommunication Video demodulator, exactly a Mach-Zehnder interferometer MZDI and a photoelectric detector PD are carried out cascade, realize the extraction of multicast business datum.
8. as the device of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described carryings transmission point to point service, PTP, multicast service and broadcasting services, it is characterized in that: light source CW is continuous wave light source, for generation of the different wave length signal.
9. transmit the device of point to point service, PTP, multicast service and broadcasting services as claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described carryings, it is characterized in that: described signal of telecommunication Data represents point-to-point service, the signal of telecommunication Data that each wavelength is corresponding is different, signal of telecommunication Video represents multicast service, the signal of telecommunication Video that each wavelength is corresponding can be the same or different, signal of telecommunication Data and radiofrequency signal RF carry out the mixing of electric territory, and then carry out addition with signal of telecommunication Video, the signal that obtains is used for driving Mach zehnder modulators MZM1.
10. transmit the device of point to point service, PTP, multicast service and broadcasting services as claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described carryings, it is characterized in that: the Mach zehnder modulators MZM1 that connects each light source CW is used for the signal of telecommunication is modulated to light signal, wherein the bias point of modulator is positioned at the minimum point of adjustment curve, and signal of telecommunication Data and signal of telecommunication Video will produce the two-phase PSK bpsk signal on the different frequency of light signal like this.
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| CN103973388B (en) * | 2013-01-28 | 2017-07-21 | 上海贝尔股份有限公司 | Optical line terminal, optical network unit, optical communication system and correlation method |
| CN103747371B (en) * | 2013-12-25 | 2017-03-15 | 桂林电子科技大学 | A kind of time-division wavelength-division mixed multiplexing passive optical network system |
| CN105049120A (en) * | 2015-05-26 | 2015-11-11 | 陕西思普瑞通信设计咨询有限公司 | Communication transmission method and system |
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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 |
| CN101582721A (en) * | 2008-05-16 | 2009-11-18 | 华为技术有限公司 | Multicarrier generating device, optical transmitter and multicarrier generating method |
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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 |
| CN101582721A (en) * | 2008-05-16 | 2009-11-18 | 华为技术有限公司 | Multicarrier generating device, optical transmitter and multicarrier generating method |
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