CN103402146A - Downlink energy-saving transmission system of OFDM (Orthogonal Frequency Division Multiplexing) PON (Passive Optical Network) - Google Patents
Downlink energy-saving transmission system of OFDM (Orthogonal Frequency Division Multiplexing) PON (Passive Optical Network) Download PDFInfo
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- CN103402146A CN103402146A CN2013102897784A CN201310289778A CN103402146A CN 103402146 A CN103402146 A CN 103402146A CN 2013102897784 A CN2013102897784 A CN 2013102897784A CN 201310289778 A CN201310289778 A CN 201310289778A CN 103402146 A CN103402146 A CN 103402146A
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Abstract
The invention provides a downlink energy-saving transmission system of an OFDM (Orthogonal Frequency Division Multiplexing) PON (Passive Optical Network). The downlink energy-saving transmission system comprises an optical line terminal, a feeder line type optical fiber and a PON system, wherein the PON system comprises a remote node, a distributed optical fiber and optical network units, the optical line terminal is connected to the remote node through the feeder line type optical fiber, and the remote node is connected to each optical network unit through the distributed optical fiber. According to the downlink energy-saving transmission system provided by the invention, a timer module is added in a traditional optical network unit for controlling the switch-off time of an ADC (Analog to Digital Converter), and a selective sampling function of the ADC in each optical network unit can be directly realized in a physical layer under the scheduling and the managing without media access control; meanwhile, other follow-up digital signal processing modules can also be switched off during a switch-off process of the ADCs, and the power consumption of each optical network unit can be further reduced.
Description
Technical field
The present invention relates to the optical communication technique field, particularly, relate to a kind of descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network.
Background technology
Along with the appearance of the demands such as super band width service, large data, services and the access of long distance in Access Network, traditional time division multiplexing Time Division Multiple, the TDM EPON can not meet the demand of present stage.OFDM Orthogonal Frequency Division Multiple, it is high that OFDM has spectrum efficiency, and the characteristics such as resisting chromatic dispersion and polarization mode dispersion are considered to a kind of very potential technology in optical access network of future generation.Utilize a plurality of mutually orthogonal subcarrier transmitting user datas, can obtain the flexible Dynamic Bandwidth Allocation of wavelet Long grain; In conjunction with traditional time-division multiplex technology, its allocated bandwidth can be more flexible; Adopt Digital Signal Processing at a high speed, can realize light OFDM transceiver cheaply.
Due to the continuous increase of number of users in Access Network, optical network unit Optical Network Unit, the power consumption of ONU also sharply rises, and has occupied 60% of whole optical access network power consumption.In natural calamity etc. in emergency circumstances, because battery commonly used damages the reserve battery that can only use ONU, this moment, the power consumption of ONU directly had influence on the time that its basic function obtains serving.Therefore, the power consumption of reduction ONU seems more and more important.The time division multiplexing EPON that the people such as Hungkei Chow have proposed Bit Interleave reduces the power consumption of ONU.It has revised gigabit passive optical network Gigabit Passive Optical Network, and the GPON agreement, make up user data according to certain rule in the downlink broadcast Frame.After ONU receives broadcast data frame, only extract its data according to rule, thereby reduced many unnecessary data, process, reduced the power consumption of ONU.But it is only applicable in GPON based on TDM, for the EPON that adopts the OFDM modulation system and inapplicable.
ONU power consumption in orthogonal frequency division multiplexing passive optical network is mainly derived from analog to digital converter Analog Digital Convertor, ADC and fast Fourier transform Fast Fourier Transform, FFT module.Particularly at a high speed downlink broadcast data link, the ADC of ONU and FFT module all must always work under fast mode with the whole downlink data of demodulation, and then according to subcarrier, extract the data useful to this ONU.On the optical communication meeting Optical Fiber Communication OFC of 2013, Konstantinos Kanonakis proposes to utilize media access control Media Access Control, and the scheduling of MAC layer and modular digital signal processing module reduce the power consumption of ONU.Size according to the shared bandwidth of user data in downstream signal, the number of analog to digital converter and counting of fast Fourier transform are set, thereby dynamically change the operational module quantity in the ONU receiver, reach the purpose that reduces the ONU power consumption, but the method needs the scheduling of MAC layer to coordinate.
Find by literature search again, Peter A.Milder analyzes the integrated circuit of 25Gb/s light OFDM transceiver under the 65nm Library of Standard Pieces and Parts.At different modulation formats, different FFT count and different ADC quantified precision under, the power consumption of receiver has been carried out multianalysis.The author points out, the size that FFT counts has larger impact to size and the power consumption of the integrated circuit of OFDM transceiver.The people such as C.Kachris are studied the light OFDM power consumption in the data central site network, and adopt adaptive modulation format to reduce the power consumption of light OFDM transceiver.But in all these methods, the receiver in each ONU must receive all downlink broadcast data, need to process each broadcast data frame; And in all data after processing, only having low volume data is useful to this ONU, causes the service efficiency of ONU receiver lower.
Summary of the invention
For the defect of power-saving technology in existing orthogonal frequency division multiplexing passive optical network, the objective of the invention is to provide a kind of energy-conservation downlink transfer mechanism in orthogonal frequency division multiplexing passive optical network, reduce the power consumption of optical network unit.This mechanism does not need scheduling and the management of media access control layer, realizes descending energy-conservation transmission in physical layer fully, on dispatch and manage in the past, can not bring any impact; Secondly, it only need to increase a timer in original optical network unit, control the turn-off time of analog to digital converter in optical network unit, is easy to realize.Simultaneously, by means of synchronization module indispensable in ofdm system, the destination address information of downlink broadcast Frame is included in synchronous head, realizes descending energy-conservation transmission.
According to an aspect of the present invention, a kind of descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network is provided, comprise the optical line terminal, branched system optical fiber, the some passive optical networks that connect successively, passive optical network comprises distant-end node, some distribution type fiber-optics and some optical network units, optical line terminal is connected to distant-end node by branched system optical fiber, distant-end node is connected to optical network unit by distribution type fiber-optic, wherein
optical network unit comprises: photodetector, trsanscondutance amplifier, linear amplifier, analog to digital converter, synchronization module, timer, remove Cyclic Prefix and serial to parallel conversion module, fast Fourier transform module, balance module, separate mapping block and media access control module, photodetector, trsanscondutance amplifier, linear amplifier, analog to digital converter, remove Cyclic Prefix and serial to parallel conversion module, fast Fourier transform module, balance module, separate mapping block and be connected media access control module and connect successively, analog to digital converter comprises two output ports, an output port of analog to digital converter is connected to the removal Cyclic Prefix, the input port of serial to parallel conversion module, another output port is connected to the input port of synchronization module, the output port of synchronization module is connected to timer, the output port of timer respectively with analog to digital converter, remove Cyclic Prefix and be connected fast Fourier transform module, balance module, solution mapping block and the media access control module of being connected with the serial to parallel conversion module and be connected.
Preferably, optical line terminal comprises the second media access control module and downlink data transmitter module, wherein, and the second generation and the processing of media access control module in order to control descending original data signal; The downlink data transmitter module transmits as downlink data signal in order to convert descending original data signal to the OFDM light signal.
Preferably, the downlink data transmitter module also is used for choosing of adaptive modulation format, and the inversefouriertransform control of counting fast.
Preferably, the each data that send an optical network unit of downlink data transmitter module.
Preferably, downlink data signal adopts the transmission of downlink broadcast data frame format, and the downlink broadcast Frame comprises data and synchronous head of an optical network unit.
Preferably, synchronous head is used for determining original position and the destination address of downlink broadcast Frame.
Preferably, timer is used for controlling the turn-off time of analog to digital converter.
Preferably, distant-end node is between optical line terminal and optical network unit, one end connects optical line terminal by branched system optical fiber, the other end is by distribution type fiber-optic connecting optical network unit, distant-end node comprises light shunt/mixer, light shunt/mixer is used for the distribution of downlink data signal, in order to downlink data signal is distributed to each optical network unit that is attached thereto by distribution type fiber-optic.
Preferably, light shunt/mixer adopts 1:N light shunt/mixer, N is the quantity of the optical network unit in EPON, the N value be 64,128,256,512 or the number Main Basis system of the concrete ONU of 1024(in the length setting of Transmission Fibers).
Preferably, the total length that light distribution type fiber-optic and branched system optical fiber are added up is the scopes of several kms to 100km, for example 20km, 40km, 60km, 80km or 100km.
compared with prior art, the present invention has following beneficial effect: the present invention has increased a timer module in the optical network unit of conventional orthogonal frequency division multiplexing passive optical network system, control the turn-off time of analog to digital converter in optical network unit, realize the selective sampling function, reduce the power consumption of optical network unit, simultaneously in the analog to digital converter turn off process, can also close other follow-up one or more digital signal processing modules by timer, further reduce the power consumption of optical network unit, power-saving technology of the present invention realizes in physical layer fully, do not need scheduling and the management of media access control layer.And than sleep, the present invention need to not increase extra memory in optical line terminal and optical network unit, on the time delay of packet, can not produce extra impact.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is the structural principle schematic diagram of the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network of the present invention;
Fig. 2 is the downlink data frame structural representation;
Fig. 3 is the sync peaks schematic diagram of the destination address of broadcast data frame while being this optical network unit;
Fig. 4 is the sync peaks schematic diagram of the destination address of broadcast data frame while not being this optical network unit.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.Following examples will help those skilled in the art further to understand the present invention, but not limit in any form the present invention.Should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
See also Fig. 1, a kind of descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network, comprise the optical line terminal, branched system optical fiber, the some passive optical networks that connect successively, passive optical network comprises distant-end node, some distribution type fiber-optics and some optical network units, optical line terminal is connected to distant-end node by branched system optical fiber, and distant-end node is connected to optical network unit by distribution type fiber-optic.
Optical line terminal comprises the second media access control module and downlink data transmitter module, wherein, and the second generation and the processing of media access control module in order to control descending original data signal; The downlink data transmitter module transmits as downlink data signal in order to convert descending original data signal to the OFDM light signal, and is used for choosing of adaptive modulation format, and the inversefouriertransform control of counting fast.For example, different sub carrier adopts different m-QAM (m rank quadrature amplitude modulation), and wherein m is desirable 4,16,32,64 etc., and its concrete value need consider the characteristic of channel in transmission link.In addition, the quick inversefouriertransform points N in the downlink data transmitter module can be according to the decision of the access user quantity in real system, and wherein N desirable 32,64,128,256,512 etc.
Further, the downlink data transmitter module only comprises a wavelength, the each data that send an optical network unit of downlink data transmitter module.Downlink data signal adopts the transmission of downlink broadcast data frame format, and the downlink broadcast Frame comprises data and synchronous head of an optical network unit.Synchronous head is used for determining original position and the destination address of downlink broadcast Frame.The downlink broadcast data frame format as shown in Figure 2.
Distant-end node comprises light shunt/mixer, and light shunt/mixer is used for the distribution of downlink data signal, in order to downlink data signal is distributed to each optical network unit that is attached thereto by distribution type fiber-optic.Light shunt/mixer adopts 1:N light shunt/mixer, and the N value is 64,128,256,512 or 1024, and occurrence need to consider transmission range in system and the optical power budget of system.
optical network unit comprises: photodetector, trsanscondutance amplifier, linear amplifier, analog to digital converter, synchronization module, timer, remove Cyclic Prefix and serial to parallel conversion module, fast Fourier transform module, balance module, separate mapping block and media access control module, photodetector, trsanscondutance amplifier, linear amplifier, analog to digital converter, remove Cyclic Prefix and serial to parallel conversion module, fast Fourier transform module, balance module, separate mapping block and be connected media access control module and connect successively, analog to digital converter comprises two output ports, an output port of analog to digital converter is connected to the removal Cyclic Prefix, the input port of serial to parallel conversion module, another output port is connected to the input port of synchronization module, the output port of synchronization module is connected to timer, the output port of timer respectively with analog to digital converter, remove Cyclic Prefix and be connected fast Fourier transform module, balance module, solution mapping block and the media access control module of being connected with the serial to parallel conversion module and be connected.
As shown in Figure 1, optical network unit comprise optical network unit 1, optical network unit 2 ..., optical network unit N.Particularly, the N value depends on the splitting ratio of light shunt/mixer, and N desirable 64,128,256,512 or 1024.
Further, timer is used for controlling the turn-off time of analog to digital converter, and analog to digital converter is operated in to be selected under sampling configuration, to reduce the power consumption of optical network unit.
Further, the total length that light distribution type fiber-optic and branched system optical fiber are added up is the scopes of several kms to 100km, as 5km, 10km, 20km, 40km or 100km.
Particularly, after the optical network unit receiver receives the downlink broadcast Frame, through photodetector, light signal is converted to the signal of telecommunication, then through trsanscondutance amplifier and linear amplifier, signal is amplified.Analog to digital converter is digital signal with analog signal conversion, and carries out subsequent treatment.The result that timer is processed according to synchronization module is selected the operating state of analog to digital converter, realizes the selective sampling function, reduces the power consumption of optical network unit.Verify that by experiment synchronization module can produce Fig. 3 and two kinds of different sync peaks of Fig. 4, in order to distinguish the destination address of downlink broadcast Frame.
In addition, in the analog to digital converter turn off process, can also close other follow-up one or more digital signal processing modules by timer, further reduce the power consumption of optical network unit.
The present invention has increased a timer module in the optical network unit of conventional orthogonal frequency division multiplexing passive optical network system, control the turn-off time of analog to digital converter in optical network unit, realize the selective sampling function, reduce the power consumption of optical network unit, simultaneously in the analog to digital converter turn off process, can also close other follow-up one or more digital signal processing modules by timer, further reduce the power consumption of optical network unit, power-saving technology of the present invention realizes in physical layer fully, does not need scheduling and the management of media access control layer.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned particular implementation, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. the descending energy-conservation transmission system of an orthogonal frequency division multiplexing passive optical network, comprise the optical line terminal, branched system optical fiber, the some passive optical networks that connect successively, described passive optical network comprises distant-end node, some distribution type fiber-optics and some optical network units, described optical line terminal is connected to described distant-end node by described branched system optical fiber, described distant-end node is connected to optical network unit by distribution type fiber-optic, it is characterized in that
described optical network unit comprises: photodetector, trsanscondutance amplifier, linear amplifier, analog to digital converter, synchronization module, timer, remove Cyclic Prefix and serial to parallel conversion module, fast Fourier transform module, balance module, separate mapping block and media access control module, described photodetector, trsanscondutance amplifier, linear amplifier, analog to digital converter, remove Cyclic Prefix and serial to parallel conversion module, fast Fourier transform module, balance module, separate mapping block and be connected media access control module and connect successively, described analog to digital converter comprises two output ports, an output port of described analog to digital converter is connected to the removal Cyclic Prefix, the input port of serial to parallel conversion module, another output port is connected to the input port of synchronization module, the output port of synchronization module is connected to timer, the output port of timer respectively with described analog to digital converter, remove Cyclic Prefix and be connected fast Fourier transform module, balance module, solution mapping block and the media access control module of being connected with the serial to parallel conversion module and be connected.
2. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 1, it is characterized in that, described optical line terminal comprises the second media access control module and downlink data transmitter module, wherein, described the second generation and the processing of media access control module in order to control descending original data signal; Described downlink data transmitter module transmits as downlink data signal in order to convert descending original data signal to the OFDM light signal.
3. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 1, is characterized in that, described downlink data transmitter module can adopt choosing of adaptive modulation format, and the fast inversefouriertransform control of counting.
4. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 2, is characterized in that, the each data that send an optical network unit of described downlink data transmitter module.
5. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 4, it is characterized in that, described downlink data signal adopts the transmission of downlink broadcast data frame format, and described downlink broadcast Frame comprises data and synchronous head of an optical network unit.
6. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 5, is characterized in that, described synchronous head is used for determining original position and the destination address of described downlink broadcast Frame.
7. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 1, is characterized in that, described timer is used for controlling the turn-off time of described analog to digital converter.
8. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 2, it is characterized in that, described distant-end node comprises light shunt/mixer, described light shunt/mixer is used for the distribution of downlink data signal, in order to downlink data signal is distributed to each optical network unit that is attached thereto by distribution type fiber-optic.
9. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 8, is characterized in that, described light shunt/mixer adopts 1:N light shunt/mixer, and the N value is 64,128,256,512 or 1024.
10. the descending energy-conservation transmission system of orthogonal frequency division multiplexing passive optical network according to claim 1, is characterized in that, the total length that described smooth distribution type fiber-optic and branched system optical fiber are added up is the scopes of several kms to 100km.
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