CN102143413A - Time division multiplexing (TDM) passive optical network (PON) upgrade system and transmission method thereof - Google Patents
Time division multiplexing (TDM) passive optical network (PON) upgrade system and transmission method thereof Download PDFInfo
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Abstract
The invention provides a time division multiplexing (TDM) passive optical network (PON) upgrade system and a transmission method thereof in the technical field of fiber optical communication. The system comprises an optical line terminal, a feeder fiber, remote nodes and a plurality of optical network units (ONUs), wherein an output end and an input end of the optical line terminal are respectively connected with one end of the feeder fiber and the optical line terminal receives optical signals to be sent or received from the remote nodes; and the remote nodes are respectively connected with the plurality of ONUs and allocate each path of optical signals or receive signal processing results of the ONUs. According to the invention, a pair of coder and decoder for optical code division multiplexing (CDM) is not required to be configured for each ONU; the TDM PON upgrade system is compatible with an existing TDM PON structure and transparent for the transmitted optical signals; and the smooth upgrade of the TDM PON upgrade system can be realized, and the upgrade cost of the TDM PON upgrade system is low.
Description
Technical field
What the present invention relates to is a kind of system and transmission method thereof of technical field of optical fiber communication, specifically is a kind of time division multiplexing EPON upgrade-system and transmission method thereof.
Background technology
The time division multiplexing EPON provides being connected of optical line terminal and a plurality of optical network units, share the optical fiber medium between optical line terminal and the distant-end node, in the cost-effective while, can provide the transfer of data of high bandwidth, for the Access Network bandwidth demand of current quick growth provides a kind of strong solution.But its limited time interval resource has limited the optical network unit number of EPON, for this arises at the historic moment to the upgrading of time division multiplexing EPON research, for the System Expansion of EPON provide a kind of may.Wavelength resource is used, the scheme that the time division multiplexing EPON is upgraded is suggested, but because the time division multiplexing EPON is very ripe, disposed in a large number at home, and the introducing of wavelength-division multiplex technique is had higher requirement to optical network unit, therefore system cost is higher, realizes the smooth upgrade difficulty.And spectrum amplitude coding code division multiplexing technology is transparent to time slot, has the advantage of flexible access and asynchronous transmission, and using it to now commercial EPON upgrading is useful selection.
Find through retrieval the prior art document, people such as the Fu-Tai An of research group of Stanford University have delivered the article that is entitled as " SUCCESS-HPON:ANext-Generation Optical Access Architecture for Smooth Migration from TDM-PON to WDM-PON (SUCCESS hybrid passive optical network: be used for the of future generation light access architecture of time division multiplexing EPON to the smooth migration of Wave division multiplexing passive optical network) " on " IEEE Optical Communications (optical communication) ", this article has proposed a kind of hybrid passive optical network structure of time division multiplexing/wavelength division multiplexing, in this structure, utilize tree-like time division multiplexing and annular wavelength division multiplexing to constitute the hybrid passive optical network of time division multiplex network and wavelength division multiplexed network coexistence, thereby increased the access customer number order in the EPON, but the wavelength division multiplexed network certain customers cost in this technology is higher, and pressure for upgrading is bigger.
Further find by retrieval, people such as Satoshi Yoshima have delivered and have been entitled as the article of " 10Gb/s-Based PON Over OCDMA Uplink Burst Transmission Using SSFBG Encoder/Multi-Port Decoder and Burst-Mode Receiver (utilizing superstructure bragg grating encoder/many mouthfuls decoder and burst mode receiver to realize that the 10Gb/s optical code division multiple access inserts the passive optical network uplink burst transfer) " on " Journal of Lightwave Technology (lightwave technology magazine) ", the document has proposed a kind of upgrading structure at the time division multiplexing EPON, in this structure, optical line terminal has only been quoted the Optical Code Division Multiplexing coding decoder based on many mouthfuls, realization is carried out different codings simultaneously to unlike signal, increase the access customer number purpose simultaneously, saved the Optical Code Division Multiplexing coding decoder number that needs, but this technology remains single optical network unit is carried out independent coding, each optical network unit still needs one group of Optical Code Division Multiplexing coding decoder, and need ultra-short pulse source, so the System Expansion cost is still very high.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of time division multiplexing EPON upgrade-system and transmission method thereof are provided, no longer light orthogonal code is regarded as the one dimensional resource of distinguishing each optical network unit, but it is utilized in transmission feeder optical fiber rear and front end, it is utilized as a kind of virtual transmission medium.When the time interval resource of the time division multiplexing EPON of disposing has been used up by optical network unit, carry out the processing that light positive is handed over coding at its distant-end node place, just can in this passive optical network, add again and advance same one group of optical network unit, this group optical network unit and one group of optical network unit disposing in the past are the repetition time slots, in order in single optical fiber, to transmit, the new optical network unit that adds of this group carries out the processing that similar light positive is handed over coding at the distant-end node place, the optical network unit of same time slot different orthogonal sign indicating number can be distinguished at receiving terminal but the characteristic of code division multiplexing technology makes.Therefore under the spectrum condition of existing signal, have and how much organize light orthogonal code, just can carry out how many optical-fiber network user capacity upgradings doubly the time division multiplexing EPON.When utilization spectrum amplitude encoded light code division multiplexing technology, cataloged procedure is transparent to the time slot and the code check of light signal, does not therefore need to change the optical line terminal and the optical network unit of existing EPON, so can realize the smooth upgrade of system.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of time division multiplexing EPON upgrade-system, comprise: optical line terminal, feeder line optical fiber, distant-end node and some optical network units, wherein: the output of optical line terminal is connected with an end of feeder line optical fiber respectively with input and receives light signal to be sent or to be received from distant-end node, and distant-end node links to each other with several optical network units respectively and distributes each road light signal or accept the signal processing results of optical network unit.
Described optical line terminal comprises: first optical branching device, several first Optical Code Division Multiplexing coding decoders and several optical transceiver modules, wherein: first optical branching device is connected with the end of feeder line optical fiber and the first Optical Code Division Multiplexing coding decoder respectively and transmits the up multiplexed signals of several through the spectrum amplitude coding, and the first Optical Code Division Multiplexing coding decoder is connected with optical transceiver module and transfer encoding is preceding or decoded high-speed optical signal.
Described optical transceiver module is made up of first optical circulator, terminal light source, first modulator and photo-detector, wherein: first optical circulator is connected with the first Optical Code Division Multiplexing coding decoder with first modulator respectively and transmits the downlink time division multiplexed signals, and first optical circulator is connected and transmits the up time multiplexing signal of process spectrum amplitude decoding with photo-detector.
Described distant-end node comprises: second optical branching device, the 3rd optical branching device and several second Optical Code Division Multiplexing coding decoders, wherein: feeder line optical fiber is connected with second optical branching device, second optical branching device is connected with the second Optical Code Division Multiplexing coding decoder again, all transmit the downlink time division multiplexed signals of several through the spectrum amplitude coding, the second Optical Code Division Multiplexing coding decoder is connected the downlink time division multiplexed signals of transmission through the spectrum amplitude decoding with the 3rd optical branching device, the second Optical Code Division Multiplexing coding decoder is connected the up time multiplexing signal of transmission through the spectrum amplitude coding with second optical branching device.
Described optical network unit comprises: second optical circulator, network light source, second modulator and network probe, wherein: second optical circulator is connected and transmits the downlink time division multiplexed signals of process spectrum amplitude coding respectively with network probe with distant-end node, the network light source is connected the broadband light of transmitting no signal with second modulator, and second modulator is connected with second optical circulator and transmits the light signal that is modulated on the wideband light source.
The transmission method of the above-mentioned time division multiplexing EPON upgrade-system that the present invention relates to may further comprise the steps:
The first step, the light signal of optical transceiver module or the light signal of several optical network units send to the Optical Code Division Multiplexing coding decoder and encode, and obtain the multiplexed information through the same frequency spectrum amplitude coding;
The light signal of described optical line terminal is the time division multiplexed multiplexed signals.
The light signal of described several optical network units is single channel time multiplexing signals, and time slot is not overlapping.
Described Optical Code Division Multiplexing coding decoder does not change light signal time domain pulse shape to the spectrum coding of light signal.
Second step, the multiplex signal through the quadrature spectrum amplitude coding that the first step is obtained is transferred to first optical branching device or second optical branching device and from the multiplex signal coupling of other Optical Code Division Multiplexing coding decoders outputs, obtain the transmission of a plurality of optical transceiver modules or a plurality of optical branching device through the phase same rate of coupling or different rates synchronously or asynchronous signal;
Between the signal in described a plurality of optical transceiver module or a plurality of optical branching device is synchronizing signal, or asynchronous signal; Be identical rate signal, or the different rates signal.
In the 3rd step, the information that second first optical branching device that obtain of step or second optical branching device are coupled together is carried out beam split through the feeder line Optical Fiber Transmission to second optical branching device or first optical branching device, the information of beam split again after obtaining being coupled;
The 4th step, message transmission after the 3rd beam split that obtain of step decodes for the second Optical Code Division Multiplexing coding decoder or the first Optical Code Division Multiplexing coding decoder, is included only: the multiplexed information of this purpose optical branching device or this purpose optical transceiver module;
Described Optical Code Division Multiplexing coding decoder does not change light signal time domain pulse shape to the spectrum coding of light signal.
Signal in the described Optical Code Division Multiplexing coding decoder is a synchronizing signal, or asynchronous signal.Be identical rate signal, or the different rates signal.
In the 5th step, the decoded multiplex signal transmission with the 4th step obtained obtains the single channel multiplexed signals and is transferred to corresponding with it each optical network unit behind optical branching device, perhaps decoded multiplex signal directly is transferred to optical transceiver module.
The light signal of described optical line terminal transceiver module is a time multiplexing signal.
The light signal of described optical network unit is a time multiplexing signal.
Compared with prior art, the present invention has following beneficial effect: the Optical Code Division Multiplexing coding decoder directly is configured in feeder line optical fiber two ends, multiplex signal is carried out the same spectrum amplitude coding/decoding handle, do not need all to dispose a pair of Optical Code Division Multiplexing coding decoder for each optical network unit; To existing time division multiplexing passive optical network structure compatibility, transparent to the light signal of transmission, can realize the smooth upgrade of system, and upgrade cost is low.
Description of drawings
Fig. 1 is system's composition diagram of embodiment.
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, feeder line optical fiber 2, distant- end node 3 and 9 optical network unit 4-12, and optical line terminal 1 comprises first optical branching device 101, the first Optical Code Division Multiplexing coding decoder 102-104 and optical transceiver module 105-107, and optical transceiver module 105 comprises terminal light source 1051, first modulator 1052, first optical circulator 1053 and photo-detector 1054; Distant-end node 3 comprises second optical branching device 301, distant-end node Optical Code Division Multiplexing/decoder 302-304 and optical branching device 305-307; Optical network unit 4 comprises network light source 401, second modulator 402, optical network unit photo-detector 403, second optical circulator 404.Wherein: the I/O of optical transceiver module 105 link to each other with the first Optical Code Division Multiplexing coding decoder 102 transmission three tunnel time division multiplexing information, the I/O of optical transceiver module 106 link to each other with the first Optical Code Division Multiplexing coding decoder 103 transmission three tunnel time division multiplexing information, the I/O of optical transceiver module 107 link to each other with the first Optical Code Division Multiplexing coding decoder 104 transmission three tunnel time division multiplexing information, the first Optical Code Division Multiplexing coding decoder 102, the first Optical Code Division Multiplexing coding decoder 103 links to each other with first optical branching device 101 respectively with the first Optical Code Division Multiplexing coding decoder 104 and transmits 3 tunnel time division multiplexing information of spectrum amplitude coding/decoding separately respectively, first optical branching device links to each other with second optical branching device 301 by feeder line optical fiber 2 and transmits the information of whole EPON upgrade-system, second optical branching device 301 respectively with the second Optical Code Division Multiplexing coding decoder 302, the second Optical Code Division Multiplexing coding decoder 303 links to each other with the second Optical Code Division Multiplexing coding decoder 304 and transmits after the beam split or the information before the coupling, the second Optical Code Division Multiplexing coding decoder 302 links to each other with optical branching device 305 and transmits decoding back or preceding the comprising of coding: the information of light subscriber unit 4-6, the second Optical Code Division Multiplexing coding decoder 303 links to each other with optical branching device 306 and transmits decoding back or preceding the comprising of coding: the information of light subscriber unit 7-9, the second Optical Code Division Multiplexing coding decoder 304 links to each other with optical branching device 307 and transmits decoding back or preceding the comprising of coding: the information of light subscriber unit 10-12, optical branching device 305 links to each other with the input/output terminal of optical network unit 4 respectively, and transmission optical network unit 4 receives and the information of emission, the information that the transmission optical network unit 5 that links to each other with the input/output terminal of optical network unit 5 receives or launches, the information that the transmission optical network unit 6 that links to each other with the input/output terminal of optical network unit 6 receives or launches, optical branching device 306 links to each other with the input/output terminal of optical network unit 7 respectively, and transmission optical network unit 7 receives and the information of emission, the information that the transmission optical network unit 8 that links to each other with the input/output terminal of optical network unit 8 receives or launches, the information that the transmission optical network unit 9 that links to each other with the input/output terminal of optical network unit 9 receives or launches, optical branching device 307 link to each other with the input/output terminal of optical network unit 10 respectively, and transmission optical network unit 10 receives and the information of emission, the information that the transmission optical network unit 11 that links to each other with the input/output terminal of optical network unit 11 receives or launches, the information that the transmission optical network unit 12 that links to each other with the input/output terminal of optical network unit 12 receives or launches.The I/O of optical transceiver module 105 is link to each other with first optical branching device 1053 information of transmission optical transceiver module output or input of portion within it, first optical branching device 1053 links to each other with first modulator 1052 and transmits three road downlink time division multiplexed signalss, first modulator 1052 links to each other with terminal light source 1051, transmission does not have the broadband light of modulation signal, and first optical branching device 1053 links to each other with optical link road terminal photo-detector 1054 and transmits three tunnel up time multiplexing signals.Portion links to each other with optical-fiber network user optical circulator 404 input/output terminal of optical network unit 4 within it that transmission optical-fiber network user accepts or the information of emission, second optical circulator 404 links to each other with optical network unit photo-detector 403 and transmits single channel downlink time division multiplexed signals, second optical circulator 404 links to each other with second modulator 402 and transmits the up time multiplexing signal of single channel, and second modulator 402 links to each other with network light source 401 and transmits the broadband light that does not have modulation signal.
The transmission method of the above-mentioned time division multiplexing EPON upgrade-system that present embodiment relates to may further comprise the steps:
When optical line terminal when optical network unit transmits the overlapping time division multiplexing light signal of three tunnel asynchronous time slot:
The first step, three tunnel time division multiplexing light signals of optical transceiver module 105 outputs send to optical link Optical Code Division Multiplexing coding decoder 102 and encode, and obtain three tunnel time division multiplexing information through the same frequency spectrum amplitude coding;
Described Optical Code Division Multiplexing coding decoder does not change light signal time domain pulse shape to the spectrum coding of light signal.
Second step, three road time multiplexing signals through spectrum amplitude coding that the first step is obtained are transferred to first optical branching device 101 and are coupled from three road time multiplexing signals of the different spectral amplitude coding of Optical Code Division Multiplexing coding decoder 103,104 outputs of Optical Code Division Multiplexing coding decoder, obtain the overlapping information that is coupled of time slot of three optical transceiver modules transmission;
Between the signal of described three optical transceiver modules output is synchronizing signal, or asynchronous signal.
In the 3rd step, the overlapping information that is coupled of time slot of three optical transceiver modules transmission that second step was obtained is carried out beam split through second optical branching device 301 that feeder line optical fiber 2 is transferred to distant-end node 3, the information of beam split again after obtaining being coupled;
In the 4th step, three tunnel information one tunnel after the 3rd beam split that obtain of step are transferred to the second Optical Code Division Multiplexing coding decoder 302 and decode, and are included only: three tunnel time division multiplexing information of optical-fiber network user 4-6; One the tunnel is transferred to the second Optical Code Division Multiplexing coding decoder 303 decodes, and is included only: three tunnel time division multiplexing information of optical-fiber network user 7-9; One the tunnel is transferred to the second Optical Code Division Multiplexing coding decoder 304 decodes, and is included only: three tunnel time division multiplexing information of optical-fiber network user 10-12.
Described Optical Code Division Multiplexing coding decoder does not change light signal time domain pulse shape to the spectrum coding of light signal.
The 5th step, with the 4th step obtain through decoded three road time multiplexing signals transmission of the second Optical Code Division Multiplexing coding decoder 302, after optical branching device 304 beam split, be transferred to corresponding with it three optical network unit 4-6; With the 4th step obtain through decoded three road time multiplexing signals transmission of the second Optical Code Division Multiplexing coding decoder 303, after optical branching device 304 beam split, be transferred to corresponding with it three optical network unit 7-9; With the 4th step obtain through decoded three road time multiplexing signals transmission of the second Optical Code Division Multiplexing coding decoder 305, after optical branching device 304 beam split, be transferred to corresponding with it three optical network unit 10-12.
When optical network unit during to optical line terminal transmission time division multiplexing synchronizable optical signal:
The first step, the single channel time division multiplexing light signal through three optical network unit 4-6 of optical branching device 305 transmission sends to the first Optical Code Division Multiplexing coding decoder 302 and encodes, and obtains three tunnel time division multiplexing information through the same frequency spectrum amplitude coding;
Described Optical Code Division Multiplexing coding decoder does not change light signal time domain pulse shape to the spectrum coding of light signal.
Second step, three tunnel road time multiplexing signals of the process same frequency spectrum amplitude coding that the first step is obtained are transferred to first optical branching device 301 and are coupled from three road time multiplexing signals of optical line terminal Optical Code Division Multiplexing coding/decoding 302,303 outputs of the first Optical Code Division Multiplexing coding decoder, obtain the overlapping time division multiplexing information of the time slot that is coupled of 9 optical network units transmission;
Be synchronizing signal between the signal of described three first Optical Code Division Multiplexing coding decoders, or asynchronous signal.
The spectrum amplitude coding of described three first Optical Code Division Multiplexing coding decoders is quadratures or pseudo-orthogonal.
In the 3rd step, the information that is coupled through first optical branching device 301 that second step was obtained is transferred to first optical branching device 101 through feeder line optical fiber 2 and carries out beam split, the information of beam split again after obtaining being coupled;
In the 4th step, three tunnel information one tunnel after the 3rd beam split that obtain of step are transferred to the first Optical Code Division Multiplexing coding decoder 102 and carry out the spectrum amplitude decoding, are included only: three tunnel time division multiplexing information of optical transceiver module 105; One the tunnel is transferred to the first Optical Code Division Multiplexing coding decoder 103 carries out the spectrum amplitude decoding, is included only: three tunnel time division multiplexing information of optical transceiver module 106; One the tunnel is transferred to the first Optical Code Division Multiplexing coding decoder 104 carries out the spectrum amplitude decoding, is included only: three tunnel time division multiplexing information of optical transceiver module 107;
Described Optical Code Division Multiplexing coding decoder does not change light signal time domain pulse shape to the spectrum coding of light signal.
The spectrum amplitude decoding of described three first Optical Code Division Multiplexing coding decoders is quadratures or pseudo-orthogonal.
The 5th the step, with the 4th the step obtain directly be transferred to optical transceiver module 105 through optical line terminal Optical Code Division Multiplexing codec 102 decoded three road time multiplexing signals; With the 4th the step obtain through optical line terminal Optical Code Division Multiplexing codec 103 decoded three road time multiplexing signals directly be transferred to optical transceiver module 106 with the 4th the step obtain directly be transferred to optical transceiver module 107 through optical line terminal Optical Code Division Multiplexing codec 104 decoded three road time multiplexing signals.
Described decoded three road time multiplexing signals are the non-overlapped information of time slot.
The advantage of present embodiment: the two ends that the Optical Code Division Multiplexing codec directly are configured in the transmission feeder optical fiber of time division multiplexing EPON, directly multiple signals being carried out identical spectrum amplitude coding/decoding handles, do not need optical transceiver module and optical network unit are designed again, simultaneously the signal between a plurality of optical transceiver modules or a plurality of optical branching device there is not the synchronism requirement, being easy to that a plurality of period of the day from 11 p.m. to 1 a.m division multiplexing passive optical network rutons are crossed the Optical Code Division Multiplexing codec links together, to the signal format transparent (being indifferent to gap information and rate information) of optical transceiver module and optical network unit transmission, therefore can realize the transparent dilatation and the smooth upgrade of system.
Claims (8)
1. time division multiplexing EPON upgrade-system, it is characterized in that, comprise: optical line terminal, feeder line optical fiber, distant-end node and some optical network units, wherein: the output of optical line terminal is connected with an end of feeder line optical fiber respectively with input and receives light signal to be sent or to be received from distant-end node, and distant-end node links to each other with several optical network units respectively and distributes each road light signal or accept the signal processing results of optical network unit.
2. time division multiplexing EPON upgrade-system according to claim 1, it is characterized in that, described optical line terminal comprises: first optical branching device, several first Optical Code Division Multiplexing coding decoders and several optical transceiver modules, wherein: first optical branching device is connected with the end of feeder line optical fiber and the first Optical Code Division Multiplexing coding decoder respectively and transmits the up multiplexed signals of several through the spectrum amplitude coding, and the first Optical Code Division Multiplexing coding decoder is connected with optical transceiver module and transfer encoding is preceding or decoded high-speed optical signal.
3. time division multiplexing EPON upgrade-system according to claim 2, it is characterized in that, described optical transceiver module is made up of first optical circulator, terminal light source, first modulator and photo-detector, wherein: first optical circulator is connected with the first Optical Code Division Multiplexing coding decoder with first modulator respectively and transmits the downlink time division multiplexed signals, and first optical circulator is connected and transmits the up time multiplexing signal of process spectrum amplitude decoding with photo-detector.
4. time division multiplexing EPON upgrade-system according to claim 1, it is characterized in that, described distant-end node comprises: second optical branching device, the 3rd optical branching device and several second Optical Code Division Multiplexing coding decoders, wherein: feeder line optical fiber is connected with second optical branching device, second optical branching device is connected with the second Optical Code Division Multiplexing coding decoder again, all transmit the downlink time division multiplexed signals of several through the spectrum amplitude coding, the second Optical Code Division Multiplexing coding decoder is connected the downlink time division multiplexed signals of transmission through the spectrum amplitude decoding with the 3rd optical branching device, the second Optical Code Division Multiplexing coding decoder is connected the up time multiplexing signal of transmission through the spectrum amplitude coding with second optical branching device.
5. time division multiplexing EPON upgrade-system according to claim 1, it is characterized in that, described optical network unit comprises: second optical circulator, network light source, second modulator and network probe, wherein: second optical circulator is connected and transmits the downlink time division multiplexed signals of process spectrum amplitude coding respectively with network probe with distant-end node, the network light source is connected the broadband light of transmitting no signal with second modulator, and second modulator is connected with second optical circulator and transmits the light signal that is modulated on the wideband light source.
6. the transmission method according to the described system of above-mentioned arbitrary claim is characterized in that, may further comprise the steps:
The first step, the light signal of optical transceiver module or the light signal of several optical network units send to the Optical Code Division Multiplexing coding decoder and encode, and obtain the multiplexed information through the same frequency spectrum amplitude coding;
Second step, the multiplex signal through the quadrature spectrum amplitude coding that the first step is obtained is transferred to first optical branching device or second optical branching device and from the multiplex signal coupling of other Optical Code Division Multiplexing coding decoders outputs, obtain the transmission of a plurality of optical transceiver modules or a plurality of optical branching device through the phase same rate of coupling or different rates synchronously or asynchronous signal;
In the 3rd step, the information that second first optical branching device that obtain of step or second optical branching device are coupled together is carried out beam split through the feeder line Optical Fiber Transmission to second optical branching device or first optical branching device, the information of beam split again after obtaining being coupled;
The 4th step, message transmission after the 3rd beam split that obtain of step decodes for the second Optical Code Division Multiplexing coding decoder or the first Optical Code Division Multiplexing coding decoder, is included only: the multiplexed information of this purpose optical branching device or this purpose optical transceiver module;
In the 5th step, the decoded multiplex signal transmission with the 4th step obtained obtains the single channel multiplexed signals and is transferred to corresponding with it each optical network unit behind optical branching device, perhaps decoded multiplex signal directly is transferred to optical transceiver module.
7. transmission method according to claim 6 is characterized in that, the light signal of the optical transceiver module described in the first step is the time division multiplexed multiplexed signals; The light signal of described several optical network units is the single channel time multiplexing signal, and both time slots are not overlapping.
8. transmission method according to claim 6 is characterized in that, the same frequency spectrum amplitude coding described in the first step does not change light signal time domain pulse shape.
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Application publication date: 20110803 |