CN102036135A - Orthogonal frequency division multiple access (OFDMA) passive optical network transmission system - Google Patents
Orthogonal frequency division multiple access (OFDMA) passive optical network transmission system Download PDFInfo
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Abstract
The invention relates to an orthogonal frequency division multiple access (OFDMA) passive optical network transmission system, belonging to the technical field of optical communication. The OFDMA passive optical network transmission system comprises an optical link terminal, a feed-in optical fiber, a far-end node, a plurality of distributed optical fibers and a plurality of optical network units, wherein the optical link terminal is connected with one end of the feed-in optical fiber and outputs downlink data signals and uplink optical carrier signals; the other end of the feed-in optical fiber is connected with the far-end node and transmits the downlink data signals and the uplink optical carrier signals; two ends of the distributed optical fibers are respectively connected with the far-end node and the optical network units and transmit the downlink data signals and the uplink optical carrier signals; the optical network units process the downlink data signals and separate out the uplink optical carrier signals for modulating the uplink data signals and outputting the modulated uplink data signals through the distributed optical fibers to the far-end node and the optical link terminal; and the optical link terminal receives the uplink data signals for carrying out coherent demodulation. In the invention, the passivation of the optical network units is realized and the complexity and cost of the optical network units are reduced.
Description
Technical field
What the present invention relates to is the system and method in a kind of optical communication technique field, specifically is a kind of OFDMA passive light network transmission system.
Background technology
EPON passive optical network, PON solves as low cost that Fiber to the home, and the problem of accessing terminal is the main flow direction of current access network technology research.Traditional asynchronous transfer mode passive optical network (ATM Passive Optical Network, APON), Ethernet passive optical network (Ethernet passive optical network, EPON) and Gigabit Passive Optical Network (Gigabit Passive Optical Network, GPON) technology all is the time-division multiplexing multiple access access technology that adopts, bandwidth is shared for the user, and needs complex scheduling algorithm and frame forming tech to support dissimilar services.Because current PON Technology Need complex scheduling algorithm and frame technique supported various service.Emerging Wave division multiplexing passive optical network wavelength-division-multiplexed passive optical network, though the WDM-PON technology can provide higher bandwidth capacity, can be on the wavelength channel of special use transparent transmission miscellaneous service data, but WDM-PON suffers the restriction of the resource allocation under higher system cost and the current techniques condition.
OFDM Orthogonal Frequency Division Multiple, the OFDM technology derives from the radio frequency transmission field, in optical communication, have bigger potentiality, it can make the distributed feed-back formula Distributed Feedback in radio-frequency (RF) transmission system, Distributed Feedback Laser directly is applied in the Access Network, and then saves cost; Simultaneously, be not only the effective ways of realizing high spectrum utilization, and have opposing chromatic dispersion and polarization mode dispersion ability, therefore, adopt this technology can satisfy the broadband access and the low-cost demand of EPON based on the modulation technique of OFDM.
Orthogonal frequency division multiplexing passive optical network technology Orthogonal Frequency Division Multiple, since European optical communication European conference on optical communication conference in 2008, since the NEC experiment proposition by the Princeton University in the ECOC meeting, through the development more than 2 years, technical research among the OFDM PON mainly is centered around OFDM sign indicating number type modulated applications and (Orthogonal Frequency Division Multiple Access, OFDMA) aspects such as architecture of the EPON of access technology are studied based on OFDM.Modulation-demodulation technique among the relevant OFDMA PON is in recent years mainly round the intensity modulated of light OFDM with directly detect and carry out.In conventional OFDMA PON ascending communication system, for fear of the influence of the beat frequency noise that is produced by direct detection, each ONU needs the single wavelength passage, therefore need unite WDM technology based on general data feedback channel in the OFDMA PON system of direct detection.Coherent detection CO-OFDM (Coherent detection OFDM) is concerned with the light wave that the butt joint of this earthwave is received earlier at receiving terminal, and then does balance detection.The photosensitivity and the spectrum efficiency of coherent detection are higher, and have reduced the requirement to equipment, are one of fabulous alternatives of long Distance Transmission, this coherent technique are introduced in the OFDMA PON system to make EPON break away from the restriction of multi-wavelength simultaneously.Find that by retrieval the scheme about coherent demodulation in OFDMA PON is not a lot, and considers that above cost general coherent detection all is used in the demodulation of upward signal, promptly uses coherent demodulation device at the OLT end to document.
Through existing literature search is found, people such as Dayou Qian delivered the article that is entitled as " 108Gb/s OFDMA-PON with Polarization Multiplexing andDirect Detection (adopting the passive optical network of the OFDM of palarization multiplexing and the direct 108Gb/s that detects) " in 2010 on " Journal of Lightwave Technology (lightwave technology periodical) ", this article has only proposed a kind of raising downlink transfer speed scheme.Article adopts polarization multiplexing that two paths of signals is modulated at the polarization state of two quadratures, and then improves downlink transfer speed, improves the availability of frequency spectrum.Though this scheme is the scheme of high downstream rate of present OFDMAPON, yet this scheme has adopted polarization multiplexing, the polarization state that needs accurate control signal, and signal state of polarization is affected by the external environment easily, usually unstable, therefore this mode is not easy to realize that Practical significance is not very big, thereby can strengthen the cost of OFDMA PON.
Find by retrieval again, people such as Dayou Qian are European optical communication European conference on opticalcommunication conference in 2009, delivered the article that is entitled as " Single-Wavelength 108Gb/s UpstreamOFDMA-PON Transmission " (the up 108Gb/s OFDMAPON transmission system of single carrier) in the ECOC meeting, this article has proposed the structure that the use coherent detection is come the demodulation upstream data in the optical line terminal of OFDM PON.In this structure, adopted the LASER Light Source of four continuous waves at optical line terminal, wherein two respectively as descending and up optical carrier; Two other is respectively as the coherent source of the coherent detection of different upstream datas.The key point of this scheme is to have used coherent detection at optical line terminal in the article, can make the upstream data of the carrier suppressed of Optical Network Terminal transmission reduce the influence of broadband beat frequency noise and then the signal of telecommunication of holomorphosis OFDM at demodulating end.Yet, this scheme adopts two independent light sources at the local oscillations light source of optical line terminal as the heterodyne system coherent detection, increased the cost of optical line terminal to a certain extent, and do not make full use of the resource of light carrier, thereby the advantage cheaply that passive optical network is lost; And adopt radio frequency source with baseband OFDM signal up-conversion at optical network unit, the use of radio frequency source also can bring the increase of optical network unit cost.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of OFDMA passive light network transmission system is provided, adopt up-downgoing OFDM data-signal OFDM multiplex technique, made full use of the OFDM multiplex technique and improved up-downgoing OFDM data signal rate, at the needs that to a certain degree can satisfy broadband access; The present invention is divided into two-way with single light carrier, one tunnel input drives Mach moral modulation once by the synthetic signal of electric radio frequency clock signal and descending OFDM data-signal and produces subcarrier in two light territories and data signal modulation on light carrier, and then two subcarriers are used separately as the uplink and downlink light carrier; Other one tunnel coherent source as upgoing O FDM data-signal coherent detection.System adopts the single wavelength resource, at down direction while transmitting two paths OFDM data-signal and then increase downlink transfer capacity; Mode reserved sub-carriers by the expansion subcarrier is as up optical carrier and then realized passiveization of Optical Network Terminal, and then has reduced cost; And at descending OFDM demodulated data signal end, utilizing up and down, the beat frequency of two subcarrier bands produces two frequency multiplication radio frequency sources, with the radiofrequency signal of two frequencys multiplication radio frequency, thereby reduce because of adding radio frequency source and cause the problem of the increase of optical network unit cost as upgoing O FDM data-signal; The timing of separating to upgoing O FDM data-signal in optical line terminal has adopted the coherent demodulation mode, reduced the influence of the beat frequency noise that brings because of direct demodulation, coherent source in coherent detection does not use extra optical wavelength signal simultaneously, and then has reduced the cost problem that light source brings that adds by coherent detection.
The present invention is achieved by the following technical solutions: the present invention includes: optical line terminal, feed-in type optical fiber, distant-end node, some distribution type fiber-optics and several optical network units, wherein: optical line terminal links to each other with an end of feed-in type optical fiber and exports descending OFDM data-signal and up optical carrier, the other end of feed-in type optical fiber links to each other with distant-end node and transmits descending OFDM data-signal and up optical carrier, the two ends of distribution type fiber-optic link to each other with optical network unit with distant-end node respectively and transmit descending OFDM data-signal and up optical carrier, optical network unit is used to modulate upgoing O FDM data-signal and exports distant-end node and optical line terminal to by distribution type fiber-optic after up optical carrier is isolated in descending OFDM data-signal processing, and optical line terminal receives upgoing O FDM data-signal and carries out coherent demodulation.
Described distant-end node is a light mixer along separate routes, and this light shunt mixer is sent to the upgoing O FDM data-signal of each optical network unit optical line terminal and descending OFDM data-signal and up optical carrier are sent to each optical network unit by splitter by feed-in type optical fiber.
Described optical line terminal comprises: data-modulated unit and upstream data coherent detection unit, wherein: an end that is input to feed-in type optical fiber after the data-modulated unit synthesizes descending OFDM data-signal and the light carrier that is used for upgoing O FDM data signal modulation, the other end of feed-in type optical fiber is connected to distant-end node, and the distant-end node output has distribution type fiber-optic to be connected to optical network unit; The coherent detection device is connected to optical line terminal and upgoing O FDM data-signal is carried out coherent demodulation by feed-in type optical fiber.
Described data-modulated unit comprises: laser, first Mach of zehnder modulators, second Mach of zehnder modulators, adder, first frequency mixer, radio frequency source, first circulator, second circulator, first comb filter, second comb filter, the ofdm signal source, first 90-degree phase shifter, the first Fiber Bragg Grating FBG filter and two couplers, wherein: the output of laser links to each other with first coupler, an output of first coupler links to each other with first Mach of zehnder modulators, the radiofrequency signal of descending OFDM data-signal that the ofdm signal source produces and radio frequency source output is connected to first Mach of zehnder modulators behind adder, the output of first Mach of zehnder modulators is connected to first circulator; Output of first circulator links to each other with the first Fiber Bragg Grating FBG filter, another output of first circulator links to each other with first comb filter, and an output of first comb filter is connected on second comb filter by second circulator, another output of first comb filter links to each other with second Mach of zehnder modulators, the descending OFDM data-signal that the ofdm signal source produces and radio frequency source fail after the first frequency mixer mixing signal respectively with first 90-degree phase shifter and second Mach of zehnder modulators, the output of first 90-degree phase shifter also links to each other with second Mach of zehnder modulators; The output of second Mach of zehnder modulators links to each other with second comb filter, the output of second comb filter links to each other with second coupler with the output of the first Fiber Bragg Grating FBG filter, the output of second coupler is connected to an end of feed-in type optical fiber, the other end remote node of the connection of feed-in type optical fiber.
Described upstream data coherent detection unit comprises: second 90-degree phase shifter, two photoelectric detectors, electricity territory processor and several couplers, wherein: laser output links to each other with the 3rd coupler, an output of the 3rd coupler and the OFDM data-signal of up modulation link to each other with the 4th coupler together, the 4th coupler is connected to first photoelectric detector, another output of the 3rd coupler links to each other with second 90-degree phase shifter, the OFDM data-signal of the output of second 90-degree phase shifter and up modulation links to each other with the 5th coupler together, and the output of the 5th coupler links to each other with second photoelectric detector; The output of first and second photoelectric detectors links to each other with electric territory processor, and electric territory processor is realized the demodulation of upgoing O FDM data-signal.
Described optical network unit comprises: the second Fiber Bragg Grating FBG filter, two circulators, optical filter, the 3rd Mach of zehnder modulators, the 3rd photoelectric detector, the 4th photoelectric detector, ofdm signal source, second frequency mixer and the 6th coupler, and wherein: an end of distribution type fiber-optic links to each other with the 3rd smooth annular device; An output of the 3rd smooth annular device is connected to the second Fiber Bragg Grating FBG filter, the second Fiber Bragg Grating FBG filter output connects the 4th photoelectric detector and then realizes the demodulation of descending OFDM data-signal, the data of second Fiber Bragg Grating FBG filter reflection link to each other with the 3rd circulator, and another output of the 3rd circulator is connected to the 6th coupler; An output of the 6th coupler is connected to the 3rd comb filter, and another output is connected to optical filter, and the output of optical filter links to each other with the 3rd photoelectric detector; Output of the 3rd comb filter links to each other with the 4th photoelectric detector, and then realizes the demodulation of descending OFDM data-signal, and another output of the 3rd comb filter links to each other with the 3rd Mach of zehnder modulators by the 4th circulator; The output of the 3rd photoelectric detector links to each other with frequency mixer with the upgoing O FDM data-signal that is produced by the ofdm signal source; The output of frequency mixer links to each other with the 3rd Mach of zehnder modulators, output the 4th circulator and the 3rd comb filter of the 3rd Mach of zehnder modulators, upgoing O FDM data-signal is sent to optical combiner via distribution type fiber-optic, be input to feed-in type optical fiber one end by optical combiner, neck one end of feed-in type optical fiber is connected to optical line terminal and handles.
Compared with prior art, the present invention has the following advantages: whole transmission system adopts the single wavelength resource, reduces the dependence of broadband passive optical network system to wavelength, and reduces the cost problem of higher that causes because of need multi-wavelength resource to a certain extent; System's employing subcarrier band and light carrier are as the light carrier of descending OFDM data-signal, and use two-way light carrier is modulated and then increased descending modulation rate, is beneficial to descending jumbo transmission data and the business of realizing; Light carrier at the upgoing O FDM of optical network unit data-signal is to be provided by the subcarrier band in the descending OFDM data-signal, and then realized passiveization of optical network unit, and the radio frequency clock of upgoing O FDM data-signal is to be produced by two subcarrier band beat frequencies, and then saved the complicated and expensive electric radio frequency clock generation circuit of optical network unit, reduced the complexity and the cost of optical network unit among the OFDMA PON; Adopt the coherent detection device at optical line terminal, solved upgoing O FDM data-signal, and overcome the influence of the broadband noise of direct detection because of the Optical Network Terminal that adopts direct detection and the introduce optical network unit cost problem of higher that adopted wavelength-division technology band.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Below 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, present embodiment comprises: optical line terminal 1, feed-in type optical fiber 2, distant-end node 3, distribution type fiber-optic 4 and optical network unit 5, wherein: the light carrier that optical line terminal 1 links to each other with an end of feed-in type optical fiber 2 and exports descending OFDM data-signal and be used for upgoing O FDM data signal modulation, the light carrier that the other end of feed-in type optical fiber 2 links to each other with distant-end node 3 and transmits descending OFDM data-signal and be used for upgoing O FDM data signal modulation, one end of distribution type fiber-optic 4 links to each other with distant-end node 3, distribution type fiber-optic 4 other ends link to each other with optical network unit 5 and transmit descending OFDM data-signal and the light carrier that is used for upgoing O FDM data signal modulation, the descending OFDM data-signals of 5 pairs of optical network units are handled and are isolated simultaneously behind the light carrier that is used for upgoing O FDM data signal modulation after the upgoing O FDM data signal modulation, up OFDM data-signal is transferred to fibre-optic terminus 1 by distribution type fiber-optic 4 and distant-end node 3, and the coherent demodulation device by optical line terminal 1 carries out demodulation to upgoing O FDM data-signal then.
Described optical line terminal 1 comprises: laser 6, data-modulated unit 22, coherent detection device 21, and wherein: laser 6 outputs link to each other with data-modulated unit 22 and coherent detection device 21 respectively; The output of data-modulated unit 22 links to each other with feed-in type optical fiber, and then transmission is used for the light carrier and the descending OFDM data-signal of upgoing O FDM data signal modulation.
Described data-modulated unit 22 comprises: adder 10, frequency mixer 17, two couplers 7,20, ofdm signal source 9 and 16, radio frequency source 11, single Mach zehnder modulators 8 that drives, circulator 12 and 43, Fiber Bragg Grating FBG filter 13, two comb filter 14 and 19, first 90-degree phase shifter 44, two driving Mach zehnder modulators 18, wherein: the output of laser 6 links to each other with coupler 6, the output of coupler 6 links to each other with Mach zehnder modulators 8, ofdm signal source 9 is connected to Mach zehnder modulators 8 with radio frequency source 11 after adder 10, the output of Mach zehnder modulators 8 is connected to circulator 12; An output of circulator 12 links to each other with Fiber Bragg Grating FBG filter 13, another output of circulator 12 links to each other with comb filter 14,14 1 outputs of comb filter are connected on the comb filter 19 by circulator 43, another output of comb filter 14 links to each other with two driving Mach zehnder modulators 18, descending OFDM data-signal that ofdm signal source 16 produces and the signal of radio frequency source 11 after frequency mixer 17 mixing also link to each other with two driving Mach zehnder modulators 18 with first 90-degree phase shifter 44 and two Mach zehnder modulators 18, the first 90-degree phase shifters 44 that drive respectively; Two outputs that drive Mach zehnder modulators 18 link to each other with comb filter 19, the output of comb filter 19 links to each other with coupler 20 with the output of Fiber Bragg Grating FBG filter 13, the output of coupler 20 is connected to an end of feed-in type optical fiber 2, the other end remote node of the connection 3 of feed-in type optical fiber 2.
Described coherent detection device 21 comprises: four couplers 23,24,25,26, second 90-degree phase shifter 27, two photoelectric detectors 28 and 29, electricity territory demodulating equipment 30, wherein: laser output links to each other with coupler 26, an output of coupler 26 and the OFDM data-signal of up modulation link to each other with 24 couplers together, coupler 24 is connected on the photoelectric detector 29, another output of coupler 26 links to each other with second 90-degree phase shifter 27, the OFDM data-signal of the output of second 90-degree phase shifter 27 and up modulation links to each other with coupler 25 together, and the output of coupler 25 links to each other with photoelectric detector 28; Photoelectric detector 28 links to each other with electric territory processor 30 with 29 output, and electric territory processor 30 is realized the demodulation of upgoing O FDM data-signals.
Described optical network unit 5 comprises: circulator 31, Fiber Bragg Grating FBG filter 32, three photoelectric detectors 33 and 37 and 38, coupler 34, comb filter 35, frequency mixer 41, ofdm signal source 42, circulator 39 and single Mach zehnder modulators 40 that drive, and wherein: distribution type fiber-optic 4 links to each other with circulator 31; An output of circulator 31 is connected to Fiber Bragg Grating FBG filter 32, Fiber Bragg Grating FBG filter 32 outputs connect photoelectric detector 33, the data of Fiber Bragg Grating FBG filter 32 reflections link to each other with circulator 31, and another output of circulator 31 is connected to coupler 34; An output of coupler 34 is connected to comb filter 35, and another output is connected to optical filter 36; The output of optical filter 36 links to each other with photoelectric detector 37; 35 1 outputs of comb filter link to each other with photoelectric detector 38, and then realize the demodulation of descending OFDM data-signal, and another output of comb filter 35 links to each other with Mach zehnder modulators 40 by circulator 39; The output of photoelectric detector 37 links to each other with frequency mixer 41 with the upgoing O FDM data-signal that is produced by ofdm signal source 42; The output of frequency mixer 41 links to each other with Mach zehnder modulators 40, the output circulator 39 and comb filter 35 of Mach zehnder modulators 40, upgoing O FDM data-signal is sent to optical combiner 3 via distribution type fiber-optic 4, be input to feed-in type optical fiber 2 one ends by optical combiner, neck one end of feed-in type optical fiber is connected to optical line terminal 1 and handles.
This device carries out work in the following manner: it is that the light carrier of 1550nm is divided into two-way by coupler 7 that laser 1 is launched wavelength, one tunnel coherent source as upgoing O FDM data-signal coherent detection, one the tunnel is injected into single Mach zehnder modulators 8 that drives, descending OFDM (16-QAM) data-signal 9 and radio frequency source 11 are by adder 10 composite signal rear drive Mach moral modulation once 8, produce three logical modulated signals, its center carrier frequence has carried descending OFDM data-signal, and two subcarrier bands are for producing the light carrier of two no signals; Single Mach zehnder modulators 8 outputs that drive are input to Fiber Bragg Grating FBG filter 13 through circulator 12, leach modulated signal on the centered carrier through Fiber Bragg Grating FBG filter 13, be input to comb filter 14 by two subcarrier bands of Fiber Bragg Grating FBG filter 13 reflection by circulator 12 and be divided into two-way, wherein one the tunnel be input to circulator 43, another road is input to two Mach moral modulation once 18 that drive as light carrier, descending OFDM data-signal 16 and radio frequency source 11 by the OFDM data-signal of frequency mixer 17 synthetic up-conversions after respectively directly with by being input to behind the 90-degree phase shifter 44 on two two arms that drive Mach moral modulation once 18, a circulator 43 and two outputs that drive Mach moral modulation once 18 are connected respectively to comb filter 19; The output of Fiber Bragg Grating FBG filter 13 and comb filter 19 is arrived by feed-in type optical fiber 2 by coupler 20 and divides mixers 3, tells a part by be input to optical network unit 5 in distribution type fiber-optic 4 by minute mixer 3; The downstream signal that reaches optical network unit 5 enters Fiber Bragg Grating FBG filter 32 via circulator 31, and the signal that filter 32 leaches recovers descending OFDM data-signal 9 by photoelectric detector 38 demodulation; The signal of Fiber Bragg Grating FBG filter 32 reflections is input to coupler 34 by circulator 31, is divided into two-way one tunnel by coupler 34 and enters radio frequency clock recovery device 45, and another road is by comb filter 35; 35 two outputs of comb filter, 35 1 outputs of comb filter are connected to photoelectric detector 38 and come demodulation to be modulated at descending OFDM data-signal 16 on the subcarrier, another one output process circulator 39 is connected to the input of single Mach zehnder modulators 40 that drives, and upgoing O FDM is provided the light carrier of data signal modulation for a Mach zehnder modulators 40; After upgoing O FDM data-signal 42 passes through frequency mixer 41 with the output signal of radio frequency clock recovery device 45, be input to Mach zehnder modulators 40 as drive signal, the output of Mach zehnder modulators 40 is sent in distribution type fiber-optic 4 one piece via comb filter 35 with upgoing O FDM data-signal by circulator 39, converge to light by distribution type fiber-optic 4 and divide mixer 3, divide mixer 3 that upgoing O FDM data-signal is uploaded to the demodulation that the coherent detection unit 21 of optical line terminal 1 carries out upgoing O FDM data-signal.
The advantage of present embodiment: optical line terminal adopts the subcarrier band modulation, and downstream signal is modulated on centered carrier and the subcarrier band simultaneously, has solved the problem that multichannel data needs a plurality of wavelength resources of transmitting; And reserve the coherent source that a part of light carrier is used for the coherent demodulation of upgoing O FDM data-signal, and then alleviated the influence of broadband noise and reduced cost because of the coherent demodulation that does not need to provide the additional light carrier wave at optical line terminal; Simultaneously, in optical network unit, the radio-frequency information of two frequencys multiplication that descending two subcarrier band beat frequencies produce is by second use, radio frequency source as upgoing O FDM data-signal, thereby saved the needed radio frequency source of OFDM data-signal up-conversion, reduce the complexity of upgoing O FDM data, and provide cost savings, and the light carrier of upgoing O FDM data-signal is that the downstream signal by optical line terminal provides, thereby make optical network unit inside save the required light source of uplink, realized passiveization of optical network unit, reduced power, further provided cost savings.
Claims (6)
1. OFDMA passive light network transmission system, it is characterized in that, comprise: optical line terminal, feed-in type optical fiber, distant-end node, some distribution type fiber-optics and several optical network units, wherein: optical line terminal links to each other with an end of feed-in type optical fiber and exports descending OFDM data-signal and up optical carrier, the other end of feed-in type optical fiber links to each other with distant-end node and transmits descending OFDM data-signal and up optical carrier, the two ends of distribution type fiber-optic link to each other with optical network unit with distant-end node respectively and transmit descending OFDM data-signal and up optical carrier, optical network unit is used to modulate upgoing O FDM data-signal and exports distant-end node and optical line terminal to by distribution type fiber-optic after up optical carrier is isolated in descending OFDM data-signal processing, and optical line terminal receives upgoing O FDM data-signal and carries out coherent demodulation.
2. OFDMA passive light network transmission system according to claim 1, it is characterized in that, described distant-end node is a light mixer along separate routes, and this light shunt mixer is sent to the upgoing O FDM data-signal of each optical network unit optical line terminal and descending OFDM data-signal and up optical carrier are sent to each optical network unit by splitter by feed-in type optical fiber.
3. OFDMA passive light network transmission system according to claim 1, it is characterized in that, described optical line terminal comprises: data-modulated unit and upstream data coherent detection unit, wherein: an end that is input to feed-in type optical fiber after the data-modulated unit synthesizes descending OFDM data-signal and the light carrier that is used for upgoing O FDM data signal modulation, the other end of feed-in type optical fiber is connected to distant-end node, the distant-end node output has distribution type fiber-optic to be connected to optical network unit, and the coherent detection device is connected to optical line terminal and upgoing O FDM data-signal is carried out coherent demodulation by feed-in type optical fiber.
4. OFDMA passive light network transmission system according to claim 3, it is characterized in that, described data-modulated unit comprises: laser, first Mach of zehnder modulators, second Mach of zehnder modulators, adder, first frequency mixer, radio frequency source, first circulator, second circulator, first comb filter, second comb filter, the ofdm signal source, first 90-degree phase shifter, the first Fiber Bragg Grating FBG filter and two couplers, wherein: the output of laser links to each other with first coupler, an output of first coupler links to each other with first Mach of zehnder modulators, the radiofrequency signal of descending OFDM data-signal that the ofdm signal source produces and radio frequency source output is connected to first Mach of zehnder modulators behind adder, the output of first Mach of zehnder modulators is connected to first circulator, output of first circulator links to each other with the first Fiber Bragg Grating FBG filter, another output of first circulator links to each other with first comb filter, and an output of first comb filter is connected on second comb filter by second circulator, another output of first comb filter links to each other with second Mach of zehnder modulators, the descending OFDM data-signal that the ofdm signal source produces and radio frequency source fail after the first frequency mixer mixing signal respectively with first 90-degree phase shifter and second Mach of zehnder modulators, the output of first 90-degree phase shifter also links to each other with second Mach of zehnder modulators, the output of second Mach of zehnder modulators links to each other with second comb filter, the output of second comb filter links to each other with the first Fiber Bragg Grating FBG filter, the output of the first Fiber Bragg Grating FBG filter links to each other with second coupler, the output of second coupler is connected to an end of feed-in type optical fiber, the other end remote node of the connection of feed-in type optical fiber.
5. OFDMA passive light network transmission system according to claim 3, it is characterized in that, described upstream data coherent detection unit comprises: second 90-degree phase shifter, two photoelectric detectors, electricity territory processor and several couplers, wherein: laser output links to each other with the 3rd coupler, an output of the 3rd coupler and the OFDM data-signal of up modulation link to each other with the 4th coupler together, the 4th coupler is connected to first photoelectric detector, another output of the 3rd coupler links to each other with second 90-degree phase shifter, the OFDM data-signal of the output of second 90-degree phase shifter and up modulation links to each other with the 5th coupler together, the output of the 5th coupler links to each other with second photoelectric detector, the output of first and second photoelectric detectors links to each other with electric territory processor, and electric territory processor is realized the demodulation of upgoing O FDM data-signal.
6. according to claim 1 or 2 or 3 described OFDMA passive light network transmission systems, it is characterized in that, described optical network unit comprises: the second Fiber Bragg Grating FBG filter, two circulators, optical filter, the 3rd Mach of zehnder modulators, photoelectric detector, the ofdm signal source, second frequency mixer and the 6th coupler, wherein: an end of distribution type fiber-optic links to each other with the 3rd smooth annular device, an output of the 3rd smooth annular device is connected to the second Fiber Bragg Grating FBG filter, the second Fiber Bragg Grating FBG filter output connects the 5th Mach of zehnder modulators and then realizes the demodulation of descending OFDM data-signal, the data of second Fiber Bragg Grating FBG filter reflection link to each other with the 3rd circulator, another output of the 3rd circulator is connected to the 6th coupler, an output of the 6th coupler is connected to the 3rd comb filter, another output is connected to optical filter, the output of optical filter links to each other with the 3rd photoelectric detector, output of the 3rd comb filter links to each other with the 4th photoelectric detector, and then realize the demodulation of descending OFDM data-signal, another output of the 3rd comb filter links to each other with the 3rd Mach of zehnder modulators by the 4th circulator, the output of the 3rd photoelectric detector links to each other with frequency mixer with the upgoing O FDM data-signal that is produced by the ofdm signal source, the output of frequency mixer links to each other with the 3rd Mach of zehnder modulators, output the 4th circulator and the 3rd comb filter of the 3rd Mach of zehnder modulators, upgoing O FDM data-signal is sent to optical combiner via distribution type fiber-optic, be input to feed-in type optical fiber one end by optical combiner, neck one end of feed-in type optical fiber is connected to optical line terminal and handles.
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| CN102820945A (en) * | 2012-08-24 | 2012-12-12 | 武汉邮电科学研究院 | Passive optical network system based on Nyquist wavelength division multiplexing and realization method |
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| CN105553529B (en) * | 2015-12-07 | 2019-02-05 | 武汉邮电科学研究院 | A kind of less fundamental mode optical fibre Transmission system and its digital signal recovery method |
| CN107979454A (en) * | 2017-11-22 | 2018-05-01 | 华南理工大学 | A kind of OFDMA distributed modes downlink comb spectrum rapid extracting method |
| CN107979454B (en) * | 2017-11-22 | 2021-01-19 | 华南理工大学 | Method for rapidly extracting OFDMA distributed mode downlink comb spectrum |
| CN110891206A (en) * | 2019-11-12 | 2020-03-17 | 南京邮电大学 | WDM-RoF-PON system based on optical frequency comb and polarization multiplexing |
| CN110891206B (en) * | 2019-11-12 | 2022-02-08 | 南京邮电大学 | WDM-RoF-PON system based on optical frequency comb and polarization multiplexing |
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