CN101262299A - Wave-division multiplexing passive optical network system for supporting multicast function - Google Patents
Wave-division multiplexing passive optical network system for supporting multicast function Download PDFInfo
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Abstract
The invention relates to a wavelength division multiplex (WDM) passive optical network system that supports multicasting, pertaining to the technical field of optical communication. The invention comprises an optical link terminal, feeder optical fibers, a remote node and an optical network unit. The remote node comprises a first arrayed waveguide grating and a second arrayed waveguide grating, wherein, a first output port of the optical link terminal, through the transmission of a first feeder optical fiber, is input an input port of the first arrayed waveguide grating in the remote node; an output port of the first arrayed waveguide grating is connected to a first port of the optical network unit with signal channels of corresponding wavelength; a second output port of the optical link terminal, through the transmission of a second feeder optical fiber, is input an input port of the second arrayed waveguide grating in the remote node; an output port of the second arrayed waveguide grating is connected to a second port of the optical network unit with signal channels of corresponding wavelength. The system of the invention can realize dynamic, fast and adjustable multicasting services and meet the requirements of different users, and also has the advantages of simple structure, flexible configuration and low cost.
Description
Technical field
What the present invention relates to is a kind of system of technical field of optical fiber communication, is specifically related to a kind of WDM passive optical network system of supporting multicast functionality.
Background technology
Wave division multiplexing passive optical network is a kind of emerging optical communication technique, and because of it provides special-purpose communication wavelengths for each user, bandwidth capacity is big, and service quality is good, and convenient management has become the most competitive scheme that the user realizes that high-speed wideband inserts.Its transmission mesh portions between optical line terminal (OLT) and optical network unit (ONU) adopts low-cost, long-life Passive Optical Components, can reduce equipment effectively installs and maintenance cost, and it is good to the form and the speed transparency of light signal to transmit mesh portions, be easy to upgrading, broadband inserting service flexibly is provided.Traditional Wave division multiplexing passive optical network adopts array waveguide grating that the connection of the point-to-multipoint of physical layer is provided.In order to strengthen the function of Wave division multiplexing passive optical network, recently, support the multiple research approach of the broadcasting service of Point-to-Point Data business and point-to-multipoint also to be suggested simultaneously.But in these schemes, video traffic adopts the mode of broadcasting to send, no matter whether the user has ordered this service, these business all will be received by all terminal uses.And in the system configuration of reality, be not that all user can order business usually, in addition, more user more wishes to order multinomial business selectively.Thereby this traditional access network not only wasted system resource, increased the complexity of deployment cost and network route, also makes network insertion lack flexibility.Therefore, in WDM passive optical network system, the scheme that presses for a kind of dynamic reconfigurable of design is supported the multicast functionality of Fast Adjustable.
Find by prior art documents, people such as Ning Deng are published in the article " A WDMPassive Optical Network With Centralized Light Sources and MulticastOverlay " (realizing the Wave division multiplexing passive optical network of light source centralization and multicast service stack) of PhotonicsTechnology Letters (photon technology wall bulletin) second phase 114-116 page or leaf in 2008, mention in this article that the mixed modulated code type that adopts quadrature realizes the selectivity transmission of video traffic.In this scheme, adopt counter-rotating NRZ (IRZ) and nonreturn to zero code to carry point-to-point data service, and carry the video traffic of point-to-multipoint with the differential phase keying (DPSK) modulation format.For the user who does not order video traffic, adopt the nonreturn to zero code/differential phase keying (DPSK) sign indicating number type that mixes to carry downstream data traffic and video traffic respectively; For the user who has ordered video traffic, adopt the counter-rotating NRZ/differential phase keying (DPSK) sign indicating number type that mixes to carry downstream data traffic and video traffic respectively, by the modulation format of control downstream data traffic, realize optionally video traffic transmission.But weak point is: the switching that 1, produces counter-rotating NRZ and two kinds of sign indicating number types in electric territory needs the high speed logic device; 2, the mixed code type of employing nonreturn to zero code/differential phase keying (DPSK) can make to produce between nonreturn to zero code and the differential phase keying (DPSK) signal and interact, and makes the degraded signal quality of the two, has improved the needed luminous power of the correct reception of receiving terminal, has increased power consumption.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of novel WDM passive optical network system of supporting multicast functionality is provided, make it based on sub-carrier modulation and mixed modulated code type technology, descending Point-to-Point Data adopts the differential phase keying (DPSK) modulation format of carrier suppressed, multicast packet adopts nonreturn to zero code, the two uses different frequency bands to transmit simultaneously, realizes point-to-point wideband data access service and quick reconfigurable multicast service, for the user provides more flexible services.Simultaneously, in optical network unit, a part of luminous power of descending Point-to-Point Data signal by modulation utilization once more, thereby has been saved the required light source of uplink as the carrier wave of upstream data, has further reduced cost.
The present invention is achieved by the following technical solutions:
The present invention includes: optical line terminal, feeder line optical fiber, distant-end node and optical network unit, distant-end node comprises first, second array waveguide grating, optical line terminal comprises downlink data and multicast carrier transmit machine, wavelength interleaver, multicast packet emission machine, the upstream data receiver, first circulator and erbium-doped fiber amplifier, wherein: the output port of downlink data and multicast carrier transmit machine and the input port of wavelength interleaver are connected, first output port of wavelength interleaver and the input port of erbium-doped fiber amplifier are connected, the output of erbium-doped fiber amplifier is through the first feeder line Optical Fiber Transmission, be sent to the input port of first array waveguide grating in the distant-end node, the output port of first array waveguide grating is connected to first port of the optical network unit of respective wavelength channel, second output port of wavelength interleaver is connected with the input port of multicast packet emission machine, the output port of multicast packet emission machine is connected with first circulator, first port, first circulator the 3rd port links to each other with the upstream data receiver, second port of first circulator links to each other with the second feeder line optical fiber, after transmission, be sent to the input port of second array waveguide grating in the distant-end node, the output port of second array waveguide grating is connected to second port of the optical network unit of respective wavelength channel.
But described downlink data and multicast carrier transmit machine produce the downstream data traffic of N road wavelength division multiplexing and the multicast carrier wave of N road switch, comprise N laser, N bipolar signal generator, N frequency mixer, N radio-frequency signal source, N two Mach zehnder modulators that drives, N multicast carrier control signal generator, N * 1 optical coupler, wherein: the output port of N laser links to each other with corresponding two input ports that drive the Mach zehnder modulators respectively, bipolar signal generator output end mouth links to each other with the first input end mouth of corresponding frequency mixer respectively, the output port of radio-frequency signal source links to each other with second input port of corresponding frequency mixer respectively, the output port of frequency mixer links to each other with corresponding two first rf inputs mouths that drive the Mach zehnder modulators respectively, the about respectively corresponding two second rf inputs mouths that drive the Mach zehnder modulators of the output port of multicast carrier control signal generator link to each other, the bipolar signal generator is responsible for producing the radiofrequency signal mixing mutually that N road downstream data traffic and radio-frequency signal source produce, and be transferred to the corresponding two Mach zehnder modulators that drive, N corresponding input port of the output port of N two driving Mach zehnder modulators and N * 1 optical coupler is connected, be the output port of downlink data and multicast carrier transmit machine from N * 1 optical coupler output port, but the downstream data traffic of output wavelength division multiplexing and the multicast carrier wave of N road switch.
Described multicast packet emission machine, comprise a multicast signal generator, one first intensity modulator, wherein: second output port of the input port of first intensity modulator and wavelength interleaver links to each other, the multicast signal generator produces the rf inputs mouth that the multicast service signal is sent into first intensity modulator, the output port of first intensity modulator is the output port of multicast packet emission machine, the nonreturn to zero code light signal of output wavelength division multiplexing.
Described optical network unit, comprise downlink data receiver, multicast packet receiver, upstream data transmitter and second circulator, wherein: first port of optical network unit links to each other with the input port of downlink data receiver and the input port of upstream data transmitter by 1 * 2 splitter, the output port of upstream data transmitter and second circulator, first port connect, the 3rd port of second circulator links to each other with the multicast packet receiver, and second port of second circulator is second port of optical network unit.
Described downlink data receiver comprises one 1 bit delay interferometer, a photoelectric detector, and wherein input optical signal links to each other with the input port of 1 bit delay interferometer, and the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector.
Described upstream data transmitter, comprise one second intensity modulator, a upward signal generator, wherein Shu Ru light signal connects into the input port of second intensity modulator, the output port of upward signal generator links to each other with the radio-frequency (RF) output end mouth of second intensity modulator, and the output port of second intensity modulator is the output port of upstream data transmitter.
Operation principle of the present invention is as follows: each optical network unit takies different wavelength and communicates, thereby constitutes the EPON of wavelength division multiplexing.In downlink data and multicast carrier transmit machine, carry the bipolar signal and the radiofrequency signal of downlink data and carry out mixing, the subcarrier signal of telecommunication that obtains is loaded on two first rf inputs mouths that drive Mach moral modulation once, also be the interior light signal phase place of the first arm of modulationmodulator, can obtain double-side band differential phase keying (DPSK) light signal; Simultaneously, the control signal that is used to control the multicast carrier switch is loaded on two second rf inputs mouths that drive the Mach zehnder modulators, can change light signal phase place in second arm of modulator; At two outputs that drive Mach moral modulation once, this two ways of optical signals interferes, phase place by light signal in second arm that changes, can make the centered carrier of double-side band differential phase keying (DPSK) light signal in interior light signal of second arm and the first arm offset or not offset, whether the centered carrier of also promptly controlling downlink data and multicast carrier transmit machine output light signal keeps.Through N * 1 optical coupler, the light signal on all N wavelength is coupled into an optical fiber, and the centered carrier in this N road light signal can be by the independent control switch of corresponding multicast control signal.By after the wavelength interleaver filtering, all from the output of first output port, each road light signal is the differential phase keying (DPSK) form of carrier suppressed to the sideband signals in the light signal of N road again.N road centered carrier is exported from second output port of wavelength interleaver, and the incoming multicast data transmitter is modulated to carry multicast packet.Therefore, in downlink data and multicast carrier transmit machine,, promptly can be controlled in whether send carrier data on the respective wavelength by controlling the switch of some multicast carrier wave.
In optical network unit, the differential phase keying (DPSK) light signal that carries the carrier suppressed of downlink data is received by the downlink data receiver.Wherein, the photoelectric detector that uses in the downlink data receiver, bandwidth is higher than the base band data bandwidth, and is lower than two times of radiofrequency signal source frequency in downlink data and the multicast carrier transmit machine, and amplitude oscillation that can the filtering light signal recovers base band data.Because the differential phase keying (DPSK) light signal of carrier suppressed has constant amplitude envelops, can directly insert the upstream data transmitter, carries out amplitude shift key modulation, obtains uplink optical signal, sends it back optical line terminal again.Multicast signal is directly received by the multicast packet receiver in the optical network unit.
Compared with prior art, the present invention has following beneficial effect: the present invention produces downlink data and the multicast packet signal does not need the high speed logic device, downlink data not only uses different modulation formats with multicast packet, and take different frequency ranges, isolation is good between two kinds of data, interferes with each other little.And need use the high speed logic device at transmitter section in people's such as Ning Deng the scheme, cost is higher, and downlink data and multicast packet use the mixed code type of nonreturn to zero code/differential phase keying (DPSK), the two is interacted, degraded signal quality, improve the needed luminous power of the correct demodulation of receiver, increased power consumption.
Description of drawings
Fig. 1 is a network structure of the present invention;
Fig. 2 is for implementing the structure principle chart of single wavelength;
Fig. 3 is embodiment of the invention figure as a result.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the WDM passive optical network system of the support multicast functionality of present embodiment, comprise: optical line terminal, feeder line optical fiber, distant-end node and optical network unit, distant-end node comprises first, second array waveguide grating, optical line terminal comprises downlink data and multicast carrier transmit machine, wavelength interleaver, multicast packet emission machine, the upstream data receiver, first circulator and erbium-doped fiber amplifier, wherein: the output port of downlink data and multicast carrier transmit machine and the input port of wavelength interleaver are connected, first output port of wavelength interleaver and the input port of erbium-doped fiber amplifier are connected, the output of erbium-doped fiber amplifier is through the first feeder line Optical Fiber Transmission, be sent to the input port of first array waveguide grating in the distant-end node, the output port of first array waveguide grating is connected to first port of the optical network unit of respective wavelength channel, second output port of wavelength interleaver is connected with the input port of multicast packet emission machine, the output port of multicast packet emission machine is connected with first circulator, first port, first circulator the 3rd port links to each other with the upstream data receiver, second port of first circulator links to each other with the second feeder line optical fiber, after transmission, be sent to the input port of second array waveguide grating in the distant-end node, the output port of second array waveguide grating is connected to second port of the optical network unit of respective wavelength channel.
But described downlink data and multicast carrier transmit machine produce the downstream data traffic of N road wavelength division multiplexing and the multicast carrier wave of N road switch, comprise N laser, N bipolar signal generator, N frequency mixer, N radio-frequency signal source, N two Mach zehnder modulators that drives, N multicast carrier control signal generator, N * 1 optical coupler, wherein: the output port of N laser links to each other with corresponding two input ports that drive the Mach zehnder modulators respectively, bipolar signal generator output end mouth links to each other with the first input end mouth of corresponding frequency mixer respectively, the output port of radio-frequency signal source links to each other with second input port of corresponding frequency mixer respectively, the output port of frequency mixer links to each other with corresponding two first rf inputs mouths that drive the Mach zehnder modulators respectively, the about respectively corresponding two second rf inputs mouths that drive the Mach zehnder modulators of the output port of multicast carrier control signal generator link to each other, the bipolar signal generator is responsible for producing the radiofrequency signal mixing mutually that N road downstream data traffic and radio-frequency signal source produce, and be transferred to the corresponding two Mach zehnder modulators that drive, N corresponding input port of the output port of N two driving Mach zehnder modulators and N * 1 optical coupler is connected, be the output port of downlink data and multicast carrier transmit machine from N * 1 optical coupler output port, but the downstream data traffic of output wavelength division multiplexing and the multicast carrier wave of N road switch.Wherein: N is a natural number, shows that laser, frequency mixer, modulator, optical network unit or the like part is one to one, and their quantity is consistent.
Described multicast packet emission machine, comprise a multicast signal generator, one first intensity modulator, wherein: second output port of the input port of first intensity modulator and wavelength interleaver links to each other, the multicast signal generator produces the rf inputs mouth that the multicast service signal is sent into first intensity modulator, the output port of first intensity modulator is the output port of multicast packet emission machine, the nonreturn to zero code light signal of output wavelength division multiplexing.
Described optical network unit, comprise downlink data receiver, multicast packet receiver, upstream data transmitter and second circulator, wherein: first port of optical network unit links to each other with the input port of downlink data receiver and the input port of upstream data transmitter by 1 * 2 splitter, the output port of upstream data transmitter and second circulator, first port connect, the 3rd port of second circulator links to each other with the multicast packet receiver, and second port of second circulator is second port of optical network unit.
Described downlink data receiver comprises one 1 bit delay interferometer, a photoelectric detector, and wherein input optical signal links to each other with the input port of 1 bit delay interferometer, and the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector.
Described upstream data transmitter, comprise one second intensity modulator, a upward signal generator, wherein Shu Ru light signal connects into the input port of second intensity modulator, the output port of upward signal generator links to each other with the radio-frequency (RF) output end mouth of second intensity modulator, and the output port of second intensity modulator is the output port of upstream data transmitter.
As shown in Figure 2, only implement to carry out in the single wavelength channel situation of muticast data transmission for embodiment.Wavelength is that the light carrier of 1549.89nm is input to two Mach zehnder modulators that drive through first Polarization Controller, 1.25Gb/s the bipolarity downlink data passes through frequency mixer mixing mutually with the 12.5GHz clock signal, two first prevention at radio-frequency port that drive the Mach zehnder modulators of electric subcarrier signal input that obtain, 1.2V or two second prevention at radio-frequency port that drive the Mach zehnder modulators of 3.4V dc control signal input, control opening or closing of multicast carrier wave respectively.In the present embodiment, with a circulator and the filter action that the light Bragg grating comes the simulating wavelength interleaver.Two output ports that drive the Mach zehnder modulators link to each other with first port of the 3rd circulator, second port of the 3rd circulator links to each other with the input port of Fiber Bragg Grating FBG, through obtaining the differential phase keying (DPSK) light signal of carrier suppressed after the Fiber Bragg Grating FBG filtering, amplified by erbium-doped fiber amplifier, enter the first long feeder line Optical Fiber Transmission of 12.5km, then import first array waveguide grating, the output light signal is divided into two-way by 1 * 2 splitter: the one tunnel imports 1 bit delay interferometer, be converted into the amplitude shift keying light signal of carrier suppressed, and received by the photoelectric detector of 2.5GHz; Other one the tunnel imports second intensity modulator, modulated by the 1.25Gb/s upstream data, import first port of second circulator, second port output by second circulator, through second array waveguide grating and the second long feeder line optical fiber of 12.5km, import second port of first circulator, the upstream data receiver that is connected to first circulator the 3rd port receives.By of the second port input of the multicast carrier wave of Fiber Bragg Grating FBG reflected back from the 3rd circulator, export by the 3rd port, through second Polarization Controller, import first intensity modulator, modulated by the multicast packet of 1.25Gb/s, obtain the multicast packet of nonreturn to zero code form, import first port of first circulator, export by second port again, enter the second feeder line optical fiber, through second array waveguide grating, import second port of second circulator after the transmission, the multicast packet receiver that is connected to the 3rd port receives.All data in the present embodiment are all used the pseudo random sequence nonreturn to zero code of length as 231-1.
As shown in Figure 3, be the figure as a result of present embodiment.Fig. 3 (a) is two Mach zehnder modulators output spectrum figure that drive, and the multicast carrier wave in the middle of comprising opens and closes two kinds of situations, and the power of multicast carrier wave is high approximately 15dB when ratio is closed when opening.The electric subcarrier signal waveform of Fig. 3 (b) for obtaining after the bipolar downlink data signal of 1.25Gb/s and the radiofrequency signal mixing can be seen the phasing back of radiofrequency signal between bit of 12.5GHz.Fig. 3 (c) is the eye pattern of electric subcarrier signal, and the whole substantially constant of amplitude envelops slightly rises and falls between bit.Fig. 3 (d) is that its power fluctuates with 25GHz by the differential phase keying (DPSK) light signal eye pattern of the carrier suppressed of input erbium-doped fiber amplifier after the Fiber Bragg Grating FBG filtering, and envelope also has certain fluctuation with bit change.Fig. 3 (e) can be clear that for being demodulated into the eye pattern of the amplitude shift keying light signal of carrier suppressed through the differential phase keying (DPSK) light signal of the carrier suppressed after the 12.5km first feeder line Optical Fiber Transmission by 1 bit delay interferometer the envelope corresponding with data rises and falls.Fig. 3 (f) is the signal of telecommunication eye pattern after the amplitude shift keying light signal of carrier suppressed detects through the 2.5G photoelectric detector, and opening width is good.Fig. 3 (g) obtains owing to downlink optical signal is modulated again for through the uplink optical signal eye pattern after the 12.5km second feeder line Optical Fiber Transmission, so the also residual rf amplitude vibration that the differential phase keying (DPSK) light signal of descending carrier inhibition is arranged on the eye pattern.Fig. 3 (h) is the signal of telecommunication eye pattern of uplink optical signal after detecting through 2.5G upstream data receiver.Fig. 3 (i) goes up the amplitude fluctuation that can also see high frequency for through the multicast light signal after the 12.5km second feeder line Optical Fiber Transmission at the light flat ' 1 ' of eye pattern, and this is owing to filtering is undesirable, and the part sideband signals under residual is caused.Fig. 3 (j) is the signal of telecommunication eye pattern after detecting through 2.5G multicast packet receiver, and the amplitude fluctuation of high frequency has been filtered out fully, obtains clean eye pattern, and the luminous power that receive this moment is about-9dBm.When the multicast carrier wave was closed, the luminous power that receives was lower than-20dBm, can't correctly be detected.
Claims (9)
1, a kind of WDM passive optical network system of supporting multicast functionality comprises: optical line terminal, feeder line optical fiber, distant-end node and optical network unit is characterized in that:
Described distant-end node comprises first array waveguide grating, second array waveguide grating,
Described optical line terminal comprises downlink data and multicast carrier transmit machine, wavelength interleaver, multicast packet emission machine, upstream data receiver, first circulator and erbium-doped fiber amplifier,
Wherein: the output port of downlink data and multicast carrier transmit machine and the input port of wavelength interleaver are connected, first output port of wavelength interleaver and the input port of erbium-doped fiber amplifier are connected, the output of erbium-doped fiber amplifier is through the first feeder line Optical Fiber Transmission, be sent to the input port of first array waveguide grating in the distant-end node, the output port of first array waveguide grating is connected to first port of the optical network unit of respective wavelength channel, second output port of wavelength interleaver is connected with the input port of multicast packet emission machine, the output port of multicast packet emission machine is connected with first circulator, first port, first circulator the 3rd port links to each other with the upstream data receiver, second port of first circulator links to each other with the second feeder line optical fiber, after transmission, be sent to the input port of second array waveguide grating in the distant-end node, the output port of second array waveguide grating is connected to second port of the optical network unit of respective wavelength channel.
2, the WDM passive optical network system of support multicast functionality according to claim 1, it is characterized in that, described downlink data and multicast carrier transmit machine, comprise N laser, N bipolar signal generator, N frequency mixer, N radio-frequency signal source, N two Mach zehnder modulators that drives, N multicast carrier control signal generator, N * 1 optical coupler, wherein: the output port of N laser links to each other with corresponding two input ports that drive the Mach zehnder modulators respectively, bipolar signal generator output end mouth links to each other with the first input end mouth of corresponding frequency mixer respectively, the output port of radio-frequency signal source links to each other with second input port of corresponding frequency mixer respectively, the output port of frequency mixer links to each other with corresponding two first rf inputs mouths that drive the Mach zehnder modulators respectively, the about respectively corresponding two second rf inputs mouths that drive the Mach zehnder modulators of the output port of multicast carrier control signal generator link to each other, the bipolar signal generator is responsible for producing the radiofrequency signal mixing mutually that N road downstream data traffic and radio-frequency signal source produce, and be transferred to the corresponding two Mach zehnder modulators that drive, N corresponding input port of the output port of N two driving Mach zehnder modulators and N * 1 optical coupler is connected, be the output port of downlink data and multicast carrier transmit machine from N * 1 optical coupler output port, but the downstream data traffic of output wavelength division multiplexing and the multicast carrier wave of N road switch.
3, the WDM passive optical network system of support multicast functionality according to claim 1, it is characterized in that, described multicast packet emission machine, comprise a multicast signal generator, one first intensity modulator, wherein: second output port of the input port of first intensity modulator and wavelength interleaver links to each other, the multicast signal generator produces the rf inputs mouth that the multicast service signal is sent into first intensity modulator, the output port of first intensity modulator is the output port of multicast packet emission machine, the nonreturn to zero code light signal of output wavelength division multiplexing.
4, according to claim 1 or 3 described WDM passive optical network systems based on the support multicast functionality, it is characterized in that, after wavelength interleaver filtering, sideband signals in the light signal of N road is all exported from wavelength interleaver first output port, each road light signal is the differential phase keying (DPSK) form of carrier suppressed, and N road centered carrier is from second output port output of wavelength interleaver.
5, the WDM passive optical network system of support multicast functionality according to claim 1, it is characterized in that, described optical network unit, comprise the downlink data receiver, the multicast packet receiver, the upstream data transmitter and second circulator, wherein: first port of optical network unit links to each other with the input port of downlink data receiver and the input port of upstream data transmitter by 1 * 2 splitter, the output port of upstream data transmitter and second circulator, first port connect, the 3rd port of second circulator links to each other with the multicast packet receiver, and second port of second circulator is second port of optical network unit.
6, the WDM passive optical network system of support multicast functionality according to claim 5, it is characterized in that, described downlink data receiver, comprise one 1 bit delay interferometer, a photoelectric detector, wherein input optical signal links to each other with the input port of 1 bit delay interferometer, and the output port of 1 bit delay interferometer links to each other with the input port of photoelectric detector.
7, according to claim 5 based on the WDM passive optical network system of supporting multicast functionality, it is characterized in that, described upstream data transmitter, comprise one second intensity modulator, a upward signal generator, wherein Shu Ru light signal connects into the input port of second intensity modulator, and the output port of upward signal generator links to each other with the radio-frequency (RF) output end mouth of second intensity modulator, and the output port of second intensity modulator is the output port of upstream data transmitter.
8, according to claim 6 or 7 described WDM passive optical network systems based on the support multicast functionality, it is characterized in that, described downlink data receiver, photoelectric detector bandwidth in it is higher than the base band data bandwidth, and be lower than two times of radiofrequency signal source frequency in downlink data and the multicast carrier transmit machine, get final product the amplitude oscillation of filtering light signal, recover base band data.
9, according to claim 1 based on the WDM passive optical network system of supporting multicast functionality, it is characterized in that, in described downlink data and the multicast carrier transmit machine, carry the bipolar signal and the radiofrequency signal of downlink data and carry out mixing, the subcarrier signal of telecommunication that obtains is loaded on two first rf inputs mouths that drive Mach moral modulation once, also be the interior light signal phase place of the first arm of modulationmodulator, obtain double-side band differential phase keying (DPSK) light signal; Simultaneously, the control signal that is used to control the multicast carrier switch is loaded on two second rf inputs mouths that drive the Mach zehnder modulators, changes light signal phase place in second arm of modulator; At two outputs that drive Mach moral modulation once, this two ways of optical signals interferes, phase place by light signal in second arm that changes, make the centered carrier of double-side band differential phase keying (DPSK) light signal in interior light signal of second arm and the first arm offset or not offset, whether the centered carrier of also promptly controlling downlink data and multicast carrier transmit machine output light signal keeps.
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Cited By (4)
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| CN101765032B (en) * | 2010-01-04 | 2012-08-29 | 上海交通大学 | Dynamic multicast downlink data transmitter modulated by single side band subcarrier |
| CN101729943B (en) * | 2009-11-26 | 2012-10-31 | 上海大学 | System and method for using wavelength division multiplex passive optical network to realize sharing of downlink wavelength |
| CN101741468B (en) * | 2009-12-17 | 2013-02-06 | 上海交通大学 | Wavelength division multiplexing passive optical network system supporting deflection routing multicast function |
| CN103747371A (en) * | 2013-12-25 | 2014-04-23 | 桂林电子科技大学 | Time division wavelength division hybrid multiplexing passive optical network system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4747717B2 (en) * | 2005-07-29 | 2011-08-17 | 日本電気株式会社 | Center side device, multicast communication method, device and optical access network in optical access network |
| CN101068129B (en) * | 2006-06-26 | 2011-11-16 | 华为技术有限公司 | Method for realizing group broadcasting service in WDM-PON , system thereof and OLT |
| CN101119163B (en) * | 2006-07-31 | 2011-08-10 | 华为技术有限公司 | WDM-PON method, system and optical line terminal for implementing multicast service |
| CN100536399C (en) * | 2007-06-06 | 2009-09-02 | 中兴通讯股份有限公司 | A distributed controllable multicast system of passive optical network and its implementation method |
| CN101119220B (en) * | 2007-09-24 | 2010-06-09 | 中兴通讯股份有限公司 | Gb passive optical network based multicast service implementing method and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101729943B (en) * | 2009-11-26 | 2012-10-31 | 上海大学 | System and method for using wavelength division multiplex passive optical network to realize sharing of downlink wavelength |
| CN101741468B (en) * | 2009-12-17 | 2013-02-06 | 上海交通大学 | Wavelength division multiplexing passive optical network system supporting deflection routing multicast function |
| CN101765032B (en) * | 2010-01-04 | 2012-08-29 | 上海交通大学 | Dynamic multicast downlink data transmitter modulated by single side band subcarrier |
| CN103747371A (en) * | 2013-12-25 | 2014-04-23 | 桂林电子科技大学 | Time division wavelength division hybrid multiplexing passive optical network system |
| 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 |
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| CN101262299B (en) | 2012-04-25 |
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