CN101719803B - Subcarrier multicasting transmission system in wavelength division multiplexing passive optical network - Google Patents
Subcarrier multicasting transmission system in wavelength division multiplexing passive optical network Download PDFInfo
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- CN101719803B CN101719803B CN 200910310575 CN200910310575A CN101719803B CN 101719803 B CN101719803 B CN 101719803B CN 200910310575 CN200910310575 CN 200910310575 CN 200910310575 A CN200910310575 A CN 200910310575A CN 101719803 B CN101719803 B CN 101719803B
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Abstract
The invention discloses a subcarrier multicasting transmission system in a wavelength division multiplexing passive optical network, which comprises an optical line terminal, two feed-in line optical fibers, a remote node, a plurality of distribution line optical fibers and a plurality of optical network units. The remote node comprises a second arrayed waveguide grating and a third arrayed waveguide grating, wherein the optical line terminal is connected to the input port of the second arrayed waveguide grating of the remote node through the first feed-in line optical fiber, the output port of the second arrayed waveguide grating is connected to the input port of the optical network unit of a corresponding wavelength channel, the output port of the optical network unit is connected to the corresponding input port of the third arrayed waveguide grating of the remote node, and the output port of the third arrayed waveguide grating is connected to the optical line terminal through the second feed-in line optical fiber. As the output of a switch-controlled multicasting subcarrier emitter, the invention realizes dynamic and rapidly-adjustable multicasting services, omits the liquid source required by the uplink transmission, lowers the power and saves the cost.
Description
Technical field
What the present invention relates to is the system in a kind of optical communication technique field, specifically the subcarrier multicasting transmission system in a kind of Wave division multiplexing passive optical network.
Background technology
In recent years, Wave division multiplexing passive optical network (wavelength-division-multiplexed passive opticalnetwork, WDM-PON) technology is acknowledged as a kind of emerging following broadband access technology, and it can provide higher bandwidth capacity, larger coverage, preferably service quality, flexibly and effectively upgrading and allocation plan etc.Traditional Wave division multiplexing passive optical network forms virtual point-to-point syndeton for each user provides special-purpose wavelength channel.In order to satisfy the quick reconfigurable multicast service of Future Broadband Access Network user, such as demands such as video conference, video request programs, some realize that in Wave division multiplexing passive optical network the multicast transmission scheme is suggested.In multicast service configuration, a part of user has ordered a certain multicast service, has formed a multicast group, and multicast packet adopts multicast mode optionally to send to group member user but not whole user; Require simultaneously multicast mechanism will adapt to the characteristics of group member's dynamic change.(In-band) transmission technology in the band that mainly contains the quadrature hybrid modulation format that has proposed at present, based on outer (Out-band) transmission technology of band of subcarrier multiplexing (SCM) etc.
Through existing literature search is found, the people such as Ning Deng have delivered the article that is entitled as " A WDM-PONArchitecture with Selective-Broadcast Overlay (realizing the Wave division multiplexing passive optical network structure of the professional stack of selective broadcast) " at " ECOC2007 European conference onoptical communication conference (ECOC Eeuropean Conference on Optical Communications) ", this article has proposed a kind of multicast service superimposing technique of quadrature hybrid modulation format, by controlling the modulation format of descending unicast data traffic, realize optionally video traffic transmission.But this technology has increased the configure and maintenance cost of system because the switching that produces counter-rotating NRZ and two kinds of patterns in electric territory needs the high speed logic device; And transmission technologys in two kinds of professional bands that adopt same frequency spectrums, produces between nonreturn to zero code and the differential phase keying (DPSK) signal and interact, make two kinds of service signal quality deteriorations, improved the correctly needed luminous power of reception of user side ONU, increased power consumption.
Find through retrieval again, the people such as Qingjiang Chang have delivered the article that is entitled as " Simultaneoustransmission of point-to-point data and selective delivery of video services ina WDM-PON using ASK-SCM modulation format (transmitting simultaneously Point-to-Point Data and multicast service based on the ASK-SCM modulation format in Wave division multiplexing passive optical network) " at " OFC2008 Optical Fiber CommunicationConference and Exposition (U.S.'s optical communication meeting) ", this article is by regulating the extinction ratio of descending clean culture am signals, realize that dynamic selectivity transmits video traffic, but downstream data traffic and group broadcasting video frequency business directly stack on subcarrier in this technology, produce between amplitude keying signal and the multicast radiofrequency signal and interact, make two kinds of service signal quality deteriorations, improve the needed luminous power of the correct reception of user side ONU, increased power consumption.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, the subcarrier multicasting transmission system in a kind of Wave division multiplexing passive optical network is provided.The present invention increases multicast subcarrier emission source at the descending unicast data transmitter section of each road wavelength channel, and by controlling the switch of multicast subcarrier emission source, realize the laying of multicast packet business, increased the professional diversity of broadband access network, simple in structure, be easy to configuration, and saved the required light source of uplink, further reduced cost.
The present invention is achieved by the following technical solutions:
The present invention includes: optical line terminal, two feed-in line optical fiber, distant-end node, some up distributing line optical fiber, some descending distributing line optical fiber and several optical network units, wherein: optical line terminal links to each other with an end of the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, optical line terminal links to each other with an end of the second feed-in line optical fiber and transmits the wavelength-division multiplex signals of up unicast data light range signal, the other end of the first feed-in line optical fiber links to each other with distant-end node and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, the other end of the second feed-in line optical fiber links to each other with distant-end node and transmits the wavelength-division multiplex signals of up unicast data light range signal, distant-end node links to each other with an end of descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, distant-end node links to each other with an end of up distributing line optical fiber and transmits up unicast data light range signal, the other end of descending distributing line optical fiber links to each other with optical network unit and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, and the other end of up distributing line optical fiber links to each other with optical network unit and transmits up unicast data light range signal.
Described distant-end node comprises: the second array waveguide grating and the 3rd array waveguide grating, wherein: an end of the second array waveguide grating links to each other with the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, the other end of the second array waveguide grating links to each other with descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, one end of the 3rd array waveguide grating links to each other with the second feed-in line optical fiber and transmits the wavelength-division multiplex signals of up unicast data light range signal, the other end of the 3rd array waveguide grating up unicast data light range signal of transmission that links to each other with up distributing line optical fiber, distant-end node are used for the multiplexing of the demultiplexing of descending unicast data and multicast packet and up unicast data.
Described optical line terminal comprises: descending unicast data and multicast subcarrier transmitter, multicast packet emission machine and up unicast data receiver, wherein: link to each other with the multicast packet emission machine wavelength-division multiplex signals of composite signal of transmission descending unicast data light range signal and multicast packet optical sub-carrier of descending unicast data and multicast subcarrier transmitter, multicast packet emission machine links to each other with an end of the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, up unicast data receiver links to each other with an end of the second feed-in line optical fiber and transmits the wavelength-division multiplex signals of up unicast data light range signal, and optical line terminal is used for descending unicast data and the emission of multicast packet and the reception of up unicast data.
Described descending unicast data and multicast subcarrier transmitter, comprise: several lasers, several bipolar signal generators, several multicast subcarrier radio-frequency (RF) control signal generators, several pairs parallel Mach zehnder modulators and the first array waveguide grating, wherein: the output port of each laser links to each other with the input port of two parallel Mach zehnder modulators respectively and transmits single wavelength light carrier wave, the output port of each bipolar signal generator links to each other with the first rf inputs mouth of two parallel Mach zehnder modulators respectively and transmits the descending unicast data signal of telecommunication, the output port of each multicast subcarrier radio-frequency (RF) control signal generator links to each other with the second rf inputs mouth of corresponding two parallel Mach zehnder modulators respectively and transmits the radio frequency clock signal, the output port of each two parallel Mach zehnder modulators links to each other with the corresponding input port of the first array waveguide grating and transmits the composite signal of descending unicast data light range signal and multicast packet optical sub-carrier, the first array waveguide grating is used for the composite signal of the some roads of wavelength division multiplexing descending unicast data light range signal and multicast packet optical sub-carrier, the link to each other wavelength-division multiplex signals of the composite signal of transmitting descending unicast data light range signal and multicast packet optical sub-carrier of the input port of the output port of the first array waveguide grating and multicast packet emission machine.
Described multicast packet emission machine, comprise: multicast signal generator and phase-modulator, wherein: the link to each other wavelength-division multiplex signals of composite signal of transmission descending unicast data light range signal and multicast packet optical sub-carrier of the output port of the input port of phase-modulator and descending unicast data and multicast subcarrier transmitter, the output port of multicast signal generator links to each other with the rf inputs mouth of phase-modulator and transmits the descending multicast packet signal of telecommunication, and the output port of phase-modulator links to each other with the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet.
Described optical network unit, comprise: descending unicast data receiver, the multicast packet receiver, up unicast data transmitter, optical filter and optical power divider, wherein: the input port of optical filter links to each other with descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, optical filter links to each other with optical power divider and transmits descending unicast data light range signal, the optical filter multicast data transmission optical phase signal that links to each other with the multicast packet receiver, two output ports of optical power divider link to each other with the input port of descending unicast data receiver and up unicast data transmitter respectively and transmit descending unicast data light range signal, the output port of up unicast data transmitter links to each other with up distributing line optical fiber and transmits up unicast data light range signal, and optical network unit is used for descending unicast data and the reception of multicast packet and the emission of up unicast data.
Described descending unicast data receiver is the second photoelectric detector, and this photoelectric detector is converted to the signal of telecommunication with light signal.
Described optical filter comprises: optical circulator and Fiber Bragg Grating FBG, wherein: the input port of Fiber Bragg Grating FBG links to each other with the first output port of optical circulator and transmits descending multicast packet optical phase signal, the second output port of optical circulator links to each other with the input port of optical power divider and transmits descending unicast data light range signal, and the input port of the output port of Fiber Bragg Grating FBG and multicast packet receiver links to each other and transmits descending multicast packet optical phase signal.
Described multicast packet receiver, comprise: 1 bit delayed interference device and the first photoelectric detector, wherein: the input port of 1 bit delayed interference device links to each other with optical filter and transmits descending multicast packet optical phase signal, 1 bit delayed interference device reverts to range signal with phase signal, the output port of 1 bit delayed interference device links to each other with the input port of the first photoelectric detector and transmits descending multicast packet light range signal, the first photoelectric detector is converted to the signal of telecommunication with light signal, and the output port of the first photoelectric detector is exported the descending multicast packet signal of telecommunication.
Described up unicast data transmitter, comprise: single Mach zehnder modulators and up unicast signal generator of driving, wherein: single input port that drives the Mach zehnder modulators links to each other with optical power divider and transmits descending unicast data light range signal, the output port of up unicast signal generator links to each other with single radio frequency output port that drives the Mach zehnder modulators and transmits the up unicast data signal of telecommunication, a single driving Mach zehnder modulators is used for modulating up unicast data, and single output port that drives the Mach zehnder modulators links to each other with up distributing line optical fiber and transmits up unicast data light range signal.
Compared with prior art, the present invention has following beneficial effect: unite sub-carrier modulation and the hybrid modulation pattern technology of adopting, descending point-to-point unicast data adopts nonreturn to zero code, amplitude keying, baseband modulation mechanism, the differential phase keying (DPSK) that descending multicast packet adopts carrier wave to suppress, the sub-carrier modulation form, different frequency bands is used in two kinds of data services, adopt different modulation formats to transmit simultaneously, in traditional Wave division multiplexing passive optical network, realize point-to-multipoint, quick reconfigurable multicast packet access service, simultaneously, in optical network unit, a part of base band luminous power of descending point-to-point uni-cast data signal is as the light carrier of upstream data, by again modulation utilization, thereby saved the required light source of uplink, reduced power, provided cost savings.
Description of drawings
Fig. 1 is structure principle chart of the present invention;
Fig. 2 is the structure principle chart of single wavelength channel multicast data transmission among the embodiment.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed execution mode and process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
As shown in Figure 1, present embodiment comprises: optical line terminal, two feed-in line optical fiber, distant-end node, some up distributing line optical fiber, some descending distributing line optical fiber and several optical network units, wherein: optical line terminal links to each other with an end of the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, optical line terminal links to each other with an end of the second feed-in line optical fiber and transmits the wavelength-division multiplex signals of up unicast data light range signal, the other end of the first feed-in line optical fiber links to each other with distant-end node and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, the other end of the second feed-in line optical fiber links to each other with distant-end node and transmits the wavelength-division multiplex signals of up unicast data light range signal, distant-end node links to each other with an end of descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, distant-end node links to each other with an end of up distributing line optical fiber and transmits up unicast data light range signal, the other end of descending distributing line optical fiber links to each other with optical network unit and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, and the other end of up distributing line optical fiber links to each other with optical network unit and transmits up unicast data light range signal.
Described distant-end node comprises: the second array waveguide grating and the 3rd array waveguide grating, wherein: an end of the second array waveguide grating links to each other with the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, the other end of the second array waveguide grating links to each other with descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, one end of the 3rd array waveguide grating links to each other with the second feed-in line optical fiber and transmits the wavelength-division multiplex signals of up unicast data light range signal, the other end of the 3rd array waveguide grating up unicast data light range signal of transmission that links to each other with up distributing line optical fiber, distant-end node are used for the multiplexing of the demultiplexing of descending unicast data and multicast packet and up unicast data.
Described optical line terminal comprises: descending unicast data and multicast subcarrier transmitter, multicast packet emission machine and up unicast data receiver, wherein: link to each other with the multicast packet emission machine wavelength-division multiplex signals of composite signal of transmission descending unicast data light range signal and multicast packet optical sub-carrier of descending unicast data and multicast subcarrier transmitter, multicast packet emission machine links to each other with an end of the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, up unicast data receiver links to each other with an end of the second feed-in line optical fiber and transmits the wavelength-division multiplex signals of up unicast data light range signal, and optical line terminal is used for descending unicast data and the emission of multicast packet and the reception of up unicast data.
Described descending unicast data and multicast subcarrier transmitter, comprise: several lasers, several bipolar signal generators, several multicast subcarrier radio-frequency (RF) control signal generators, several pairs parallel Mach zehnder modulators and the first array waveguide grating, wherein: the output port of each laser links to each other with the input port of two parallel Mach zehnder modulators respectively and transmits single wavelength light carrier wave, the output port of each bipolar signal generator links to each other with the first rf inputs mouth of two parallel Mach zehnder modulators respectively and transmits the descending unicast data signal of telecommunication, the output port of each multicast subcarrier radio-frequency (RF) control signal generator links to each other with the second rf inputs mouth of corresponding two parallel Mach zehnder modulators respectively and transmits the radio frequency clock signal, the output port of each two parallel Mach zehnder modulators links to each other with the corresponding input port of the first array waveguide grating and transmits the composite signal of descending unicast data light range signal and multicast packet optical sub-carrier, the first array waveguide grating is used for the composite signal of the some roads of wavelength division multiplexing descending unicast data light range signal and multicast packet optical sub-carrier, the link to each other wavelength-division multiplex signals of the composite signal of transmitting descending unicast data light range signal and multicast packet optical sub-carrier of the input port of the output port of the first array waveguide grating and multicast packet emission machine.
Described multicast packet emission machine, comprise: multicast signal generator and phase-modulator, wherein: the link to each other wavelength-division multiplex signals of composite signal of transmission descending unicast data light range signal and multicast packet optical sub-carrier of the output port of the input port of phase-modulator and descending unicast data and multicast subcarrier transmitter, the output port of multicast signal generator links to each other with the rf inputs mouth of phase-modulator and transmits the descending multicast packet signal of telecommunication, and the output port of phase-modulator links to each other with the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet.
Described optical network unit, comprise: descending unicast data receiver, the multicast packet receiver, up unicast data transmitter, optical filter and optical power divider, wherein: the input port of optical filter links to each other with descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, optical filter links to each other with optical power divider and transmits descending unicast data light range signal, the optical filter multicast data transmission optical phase signal that links to each other with the multicast packet receiver, two output ports of optical power divider link to each other with the input port of descending unicast data receiver and up unicast data transmitter respectively and transmit descending unicast data light range signal, the output port of up unicast data transmitter links to each other with up distributing line optical fiber and transmits up unicast data light range signal, and optical network unit is used for descending unicast data and the reception of multicast packet and the emission of up unicast data.
Described descending unicast data receiver is the second photoelectric detector, and this photoelectric detector is converted to the signal of telecommunication with light signal.
Described optical filter comprises: optical circulator and Fiber Bragg Grating FBG, wherein: the input port of Fiber Bragg Grating FBG links to each other with the first output port of optical circulator and transmits descending multicast packet optical phase signal, the second output port of optical circulator links to each other with the input port of optical power divider and transmits descending unicast data light range signal, and the input port of the output port of Fiber Bragg Grating FBG and multicast packet receiver links to each other and transmits descending multicast packet optical phase signal.
Described multicast packet receiver, comprise: 1 bit delayed interference device and the first photoelectric detector, wherein: the input port of 1 bit delayed interference device links to each other with optical filter and transmits descending multicast packet optical phase signal, 1 bit delayed interference device reverts to range signal with phase signal, the output port of 1 bit delayed interference device links to each other with the input port of the first photoelectric detector and transmits descending multicast packet light range signal, the first photoelectric detector is converted to the signal of telecommunication with light signal, and the output port of the first photoelectric detector is exported the descending multicast packet signal of telecommunication.
Described up unicast data transmitter, comprise: single Mach zehnder modulators and up unicast signal generator of driving, wherein: single input port that drives the Mach zehnder modulators links to each other with optical power divider and transmits descending unicast data light range signal, the output port of up unicast signal generator links to each other with single radio frequency output port that drives the Mach zehnder modulators and transmits the up unicast data signal of telecommunication, a single driving Mach zehnder modulators is used for modulating up unicast data, and single output port that drives the Mach zehnder modulators links to each other with up distributing line optical fiber and transmits up unicast data light range signal.
The situation that present embodiment is used for single wavelength channel multicast data transmission as shown in Figure 2, comprise: descending unicast data and multicast subcarrier generator 25, multicast packet emission machine 26, optical network unit 27, erbium-doped fiber amplifier 12, the logical optical filter 13 of band, up unicast data receiver 22, the monomode fiber 24 that the monomode fiber 23 that first paragraph is 12.5 kilometers and second segment are 12.5 kilometers, descending unicast data and multicast subcarrier generator 25 comprise: 1561.18nm laser 1, the first Polarization Controller 2, two parallel Mach zehnder modulators 5, the first electric amplifier 7, bipolar signal generator 9 and multicast subcarrier radio-frequency (RF) control signal generator 10, multicast packet emission machine 25 comprises: the second Polarization Controller 3, phase-modulator 6, the second electric amplifier 8 and multicast signal generator 11, optical network unit 27 comprises: optical filter 29, multicast packet receiver 28, optical power divider 19, the 3rd Polarization Controller 4, the second photoelectric detector 18, up unicast data transmitter 30, optical filter 29 is comprised of optical circulator 14 and Fiber Bragg Grating FBG 15, multicast packet receiver 28 is comprised of 1 bit delayed interference device 16 and the first photoelectric detector 17, up unicast data transmitter 30 is comprised of single driving Mach zehnder modulators 21 and up unicast signal generator 20, wherein: it is that the light carrier of 1561.18nm is input to two parallel Mach zehnder modulators 5 through the first Polarization Controller 2 that laser 1 is launched wavelength, bipolar signal generator 9 produces the descending unicast data of 1.25Gps bipolarity, after 7 amplifications of the first electric amplifier, be input to the first prevention at radio-frequency port of two parallel Mach zehnder modulators 5, produce the amplitude shift keying signal; The multicast subcarrier radio-frequency (RF) control signal generator 10 that switch is controlled produces the clock signal of 10GHz, is loaded on the second rf inputs mouth of two parallel Mach zehnder modulators 5, controls opening or closing of multicast subcarrier.The output of two parallel Mach zehnder modulators 5 is input to the phase-modulator 6 of cascade after through the second Polarization Controller 3, multicast signal generator 11 produces the multicast packet of 1.25Gps, be amplified to the crest voltage of about 5.5V through the second electric amplifier 8, drive phase-modulator 6 and obtain compound light double-sideband signal, wherein comprise the descending uni-cast data signal of amplitude keying of base band and the differential phase keying (DPSK) optical sub-carrier multicast signal of two optical sidebands.The light double-sideband signal amplifies with an erbium-doped fiber amplifier 12, and suppresses spontaneous emission noise with a logical optical filter 13 of band.After monomode fiber 23 transmission through 12.5 kilometers of first paragraphs, the optical filter 29 that consists of with an optical circulator 14 and a Fiber Bragg Grating FBG 15 separates base band light carrier and two optical sidebands in the Composite Double sideband signals, and isolated two optical sideband signals are directly inputted to multicast packet receiver 28 and recover multicast service.When 10GHz multicast subcarrier radio-frequency (RF) control signal generator 10 was opened, two optical sideband signals existed, and the user can receive multicast packet; When 10GHz multicast subcarrier radio-frequency (RF) control signal generator 10 was closed, two optical sideband signals did not exist, multicast differential phase keying data be orthogonal superposition at the base band light carrier, but be not resumed reception, the user does not just receive multicast packet yet.Isolated base band light carrier is divided into two-way by an optical power divider 19, one the tunnel is sent to the second photoelectric detector 18 recovers descending unicast data traffic, another road is sent to single Mach zehnder modulators 21 that drives through the 3rd Polarization Controller 4, single driving Mach zehnder modulators 21 bias voltages are 2.9V, the up unicast data of 1.25Gps that is produced by up unicast signal generator 20 drives, obtain the amplitude shift keying signal of uplink, after monomode fiber 24 transmission through 12.5 kilometers of second segments, enter up unicast data receiver 22 and recover up unicast data traffic.
The advantage of present embodiment: unite sub-carrier modulation and the hybrid modulation pattern technology of adopting, descending point-to-point unicast data adopts nonreturn to zero code, amplitude keying, baseband modulation mechanism, the differential phase keying (DPSK) that descending multicast packet adopts carrier wave to suppress, the sub-carrier modulation form, different frequency bands is used in two kinds of data services, adopt different modulation formats to transmit simultaneously, in traditional Wave division multiplexing passive optical network, realize point-to-multipoint, quick reconfigurable multicast packet access service, simultaneously, in optical network unit, a part of base band luminous power of descending point-to-point uni-cast data signal is as the light carrier of upstream data, by again modulation utilization, thereby saved the required light source of uplink, reduced power, provided cost savings.
Claims (9)
1. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network, it is characterized in that, comprise: optical line terminal, two feed-in line optical fiber, distant-end node, some up distributing line optical fiber, some descending distributing line optical fiber and several optical network units, wherein: optical line terminal links to each other with an end of the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, optical line terminal links to each other with an end of the second feed-in line optical fiber and receives the wavelength-division multiplex signals of up unicast data light range signal, the other end of the first feed-in line optical fiber links to each other with distant-end node and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, the other end of the second feed-in line optical fiber links to each other with distant-end node and transmits the wavelength-division multiplex signals of up unicast data light range signal, distant-end node links to each other with an end of descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, distant-end node links to each other with an end of up distributing line optical fiber and transmits up unicast data light range signal, the other end of descending distributing line optical fiber links to each other with optical network unit and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, and the other end of up distributing line optical fiber links to each other with optical network unit and transmits up unicast data light range signal;
Described distant-end node comprises: the second array waveguide grating and the 3rd array waveguide grating, wherein: an end of the second array waveguide grating links to each other with the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, the other end of the second array waveguide grating links to each other with descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, one end of the 3rd array waveguide grating links to each other with the second feed-in line optical fiber and transmits the wavelength-division multiplex signals of up unicast data light range signal, the other end of the 3rd array waveguide grating up unicast data light range signal of transmission that links to each other with up distributing line optical fiber, distant-end node are used for the multiplexing of the demultiplexing of descending unicast data and multicast packet and up unicast data;
Described optical line terminal comprises: descending unicast data and multicast subcarrier transmitter, multicast packet emission machine and up unicast data receiver, wherein: link to each other with the multicast packet emission machine wavelength-division multiplex signals of composite signal of transmission descending unicast data light range signal and multicast packet optical sub-carrier of descending unicast data and multicast subcarrier transmitter, multicast packet emission machine links to each other with an end of the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet, up unicast data receiver links to each other with an end of the second feed-in line optical fiber and receives the wavelength-division multiplex signals of up unicast data light range signal, and optical line terminal is used for descending unicast data and the emission of multicast packet and the reception of up unicast data.
2. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network according to claim 1, it is characterized in that, described descending unicast data and multicast subcarrier transmitter, comprise: several lasers, several bipolar signal generators, several multicast subcarrier radio-frequency (RF) control signal generators, several pairs parallel Mach zehnder modulators and the first array waveguide grating, wherein: the output port of each laser links to each other with the input port of two parallel Mach zehnder modulators respectively and transmits single wavelength light carrier wave, the output port of each bipolar signal generator links to each other with the first rf inputs mouth of two parallel Mach zehnder modulators respectively and transmits the descending unicast data signal of telecommunication, the output port of each multicast subcarrier radio-frequency (RF) control signal generator links to each other with the second rf inputs mouth of corresponding two parallel Mach zehnder modulators respectively and transmits the radio frequency clock signal, the output port of each two parallel Mach zehnder modulators links to each other with the corresponding input port of the first array waveguide grating and transmits the composite signal of descending unicast data light range signal and multicast packet optical sub-carrier, the first array waveguide grating is used for the composite signal of the some roads of wavelength division multiplexing descending unicast data light range signal and multicast packet optical sub-carrier, the link to each other wavelength-division multiplex signals of the composite signal of transmitting descending unicast data light range signal and multicast packet optical sub-carrier of the input port of the output port of the first array waveguide grating and multicast packet emission machine.
3. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network according to claim 1, it is characterized in that, described multicast packet emission machine, comprise: multicast signal generator and phase-modulator, wherein: the link to each other wavelength-division multiplex signals of composite signal of transmission descending unicast data light range signal and multicast packet optical sub-carrier of the output port of the input port of phase-modulator and descending unicast data and multicast subcarrier transmitter, the output port of multicast signal generator links to each other with the rf inputs mouth of phase-modulator and transmits the descending multicast packet signal of telecommunication, and the output port of phase-modulator links to each other with the first feed-in line optical fiber and transmits the wavelength-division multiplex signals of descending unicast data and multicast packet.
4. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network according to claim 1, it is characterized in that, described optical network unit, comprise: descending unicast data receiver, the multicast packet receiver, up unicast data transmitter, optical filter and optical power divider, wherein: the input port of optical filter links to each other with descending distributing line optical fiber and transmits the Wave Decomposition multiplexed signals of descending unicast data and multicast packet, optical filter links to each other with optical power divider and transmits descending unicast data light range signal, the optical filter multicast data transmission optical phase signal that links to each other with the multicast packet receiver, two output ports of optical power divider link to each other with the input port of descending unicast data receiver and up unicast data transmitter respectively and transmit descending unicast data light range signal, the output port of up unicast data transmitter links to each other with up distributing line optical fiber and transmits up unicast data light range signal, and optical network unit is used for descending unicast data and the reception of multicast packet and the emission of up unicast data.
5. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network according to claim 4 is characterized in that, described descending unicast data receiver is the second photoelectric detector.
6. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network according to claim 4, it is characterized in that, described optical filter comprises: optical circulator and Fiber Bragg Grating FBG, wherein: the input port of Fiber Bragg Grating FBG links to each other with the first output port of optical circulator and transmits descending multicast packet optical phase signal, the second output port of optical circulator links to each other with the input port of optical power divider and transmits descending unicast data light range signal, and the input port of the output port of Fiber Bragg Grating FBG and multicast packet receiver links to each other and transmits descending multicast packet optical phase signal.
7. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network according to claim 4, it is characterized in that, described multicast packet receiver, comprise: 1 bit delayed interference device and the first photoelectric detector, wherein: the input port of 1 bit delayed interference device links to each other with optical filter and transmits descending multicast packet optical phase signal, 1 bit delayed interference device reverts to range signal with phase signal, the output port of 1 bit delayed interference device links to each other with the input port of the first photoelectric detector and transmits descending multicast packet light range signal, the first photoelectric detector is converted to the signal of telecommunication with light signal, and the output port of the first photoelectric detector is exported the descending multicast packet signal of telecommunication.
8. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network according to claim 4, it is characterized in that, described up unicast data transmitter, comprise: single Mach zehnder modulators and up unicast signal generator of driving, wherein: single input port that drives the Mach zehnder modulators links to each other with optical power divider and transmits descending unicast data light range signal, the output port of up unicast signal generator links to each other with single radio frequency output port that drives the Mach zehnder modulators and transmits the up unicast data signal of telecommunication, a single driving Mach zehnder modulators is used for modulating up unicast data, and single output port that drives the Mach zehnder modulators links to each other with up distributing line optical fiber and transmits up unicast data light range signal.
9. the subcarrier multicasting transmission system in the Wave division multiplexing passive optical network according to claim 1, it is characterized in that, also comprise: two electric amplifiers, the second Polarization Controller, the 3rd Polarization Controller, the logical optical filter of erbium-doped fiber amplifier and band, wherein: the first electric amplifier is positioned at descending unicast data and multicast subcarrier transmitter, descending unicast data and multicast subcarrier generator comprise bipolar signal generator and two parallel Mach zehnder modulators, the bipolar signal generator produces the descending unicast data of 1.25Gps bipolarity, after the amplification of the first electric amplifier, be input to the first prevention at radio-frequency port of two parallel Mach zehnder modulators, the second electric amplifier and the second Polarization Controller are positioned at multicast packet emission machine, multicast packet emission machine comprises multicast signal generator and phase-modulator, the multicast signal generator produces the multicast packet of 1.25Gps, be amplified to the crest voltage of about 5.5V through the second electric amplifier, drive phase-modulator and obtain compound light double-sideband signal, the output of two parallel Mach zehnder modulators is input to the phase-modulator of cascade after through the second Polarization Controller, the 3rd Polarization Controller is positioned at optical network unit, optical network unit comprises optical power divider and single Mach zehnder modulators that drives, optical power divider is divided into two-way, wherein one the tunnel be sent to single Mach zehnder modulators that drives through the 3rd Polarization Controller, the erbium-doped fiber amplifier transmission light double-sideband signal that links to each other with multicast packet emission machine, the erbium-doped fiber amplifier light double-sideband signal that transmission is amplified that links to each other with the logical optical filter of band, the logical optical filter of band links to each other with the first feed-in line optical fiber and transmits the light double-sideband signal of inhibition noise.
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| CN102143413A (en) * | 2011-03-28 | 2011-08-03 | 上海交通大学 | Time division multiplexing (TDM) passive optical network (PON) upgrade system and transmission method thereof |
| CN102724012B (en) * | 2012-06-19 | 2015-07-08 | 上海交通大学 | Light-source-shared WDM-PON (wavelength division multiplexed passive optical network) system based on suppressed carrier modulation technique |
| CN102820945B (en) * | 2012-08-24 | 2015-09-30 | 武汉邮电科学研究院 | Based on passive optical network and the implementation method of Nyquist wavelength division multiplexing |
| 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 |
| KR102258094B1 (en) * | 2014-09-02 | 2021-05-31 | 텔레콤 이탈리아 소시에떼 퍼 아찌오니 | Activation of an optical network unit in a multi-wavelength passive optical network |
| CN104883630B (en) * | 2015-05-08 | 2018-11-06 | 烽火通信科技股份有限公司 | The cascade adaption system of multicast and method in PON system |
| CN105515716B (en) * | 2015-12-28 | 2018-09-25 | 武汉邮电科学研究院 | Ofdm signal unicast based on permanent envelope and multicast optical network structure |
| CN105827320B (en) * | 2016-05-11 | 2018-07-27 | 中天宽带技术有限公司 | A kind of transmitting device of the ultra-narrow based on FFP filters and FFP-SOA with spectrum segmentation incoherent light source in WDM-PON |
| US11088764B2 (en) * | 2019-05-14 | 2021-08-10 | Infinera Corporation | Out-of-band communication channel for sub-carrier-based optical communication systems |
| CN113452448A (en) * | 2020-03-25 | 2021-09-28 | 中兴通讯股份有限公司 | Baseband processing unit, analog forwarding system and signal processing method |
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| CN101521555A (en) * | 2008-02-29 | 2009-09-02 | 冲电气工业株式会社 | Code division multiplex communication system |
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