CN104936047A - Uplink system of PON (Passive Optical Network) of filter based multicarrier modulation technology - Google Patents

Uplink system of PON (Passive Optical Network) of filter based multicarrier modulation technology Download PDF

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CN104936047A
CN104936047A CN201510310157.9A CN201510310157A CN104936047A CN 104936047 A CN104936047 A CN 104936047A CN 201510310157 A CN201510310157 A CN 201510310157A CN 104936047 A CN104936047 A CN 104936047A
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China
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filter
carrier modulation
optical network
optical
uplink transmission
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CN201510310157.9A
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Chinese (zh)
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张鹿
肖石林
毕美华
陈欣飞
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上海交通大学
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Abstract

The invention provides an uplink system of the PON of filter based multicarrier modulation technology. The uplink system comprises an optical line terminal, a feed line type fiber, a far-end node, distribution type fibers and optical network units. After filter (group) based multicarrier modulation, the optical network units transmit user information to the far-end node via the distribution type fibers by utilizing the light modulation module, the far-end node transmit signals from the different optical network units to the optical line terminal via the feed line type fiber, and the optical line terminal transmits the signals to different receivers of the optical line terminal by de-multiplexing to realize signal reception. The uplinks has higher dispersion resistance by utilizing the filter (group) based multicarrier modulation technology, interference among symbols and subcarriers of uplink users can be effectively resisted, and the uplink system can support higher transmission speed and frequency spectrum frequency , and interference among users is reduced.

Description

Based on the passive optical network uplink transmission system of filter multi-carrier modulation technology

Technical field

The invention belongs to technical field of photo communication, particularly, relate to a kind of passive optical network uplink transmission system based on filter (group) multi-carrier modulation technology.

Background technology

In recent years, along with the continuous expansion of Broadband Network Access user and terminal scale, innovate the appearance of 2.0 epoch " the Internet+" support policy, continuing to bring out of various network new business, such as virtual reality, game on line platform, cloud storage, cloud computing etc., the upstream bandwidth demand in user and market increases rapidly.Optical-fiber network as information service underlying transport facility is faced with unprecedented pressure, and the optical access network wherein as " last one kilometer " becomes the maximum bottleneck restricting industry development.Because current the whole network frequency spectrum resource is nervous, user bandwidth demand is large, therefore high speed, spectral efficient, low cost, configurablely flexibly will become the development trend of optical access network of future generation.

EPON (Passive Optical Network, PON) with optical passive component can low cost, solve the access problem of user terminal to optical fiber to high-performance, be the mainstream scheme of current optical access network.The cost of photoelectric device brought in view of speed increase, the increase of the complexity of dispatching algorithm, a large amount of EPON/GPON system of laying has been difficult to the demand meeting user at present.The passive optical network uplink system based on OOK modulation traditional at present still faces the major issues such as dispersion tolerance is low, spectrum efficiency is low, very flexible, therefore needs the new type of modulation pattern being applicable to next-generation passive optical network uplink system.

OFDM (Orthogonal Frequency Division Multiple, OFDM) technology is the modulation technique of eating dishes without rice or wine of current 4G standard, in optical communications because its resisting chromatic dispersion performance is good, be easy to carry out channel estimating, the advantage such as dynamic spectrum resource management flexibly can be realized, generally believed it is the very potential modulation of optical-fiber network of future generation and multiplex technique in industry, it is combined with EPON and will has good application prospect.But, OFDM is still faced with some challenges in the application of photosystem, first OFDM needs to utilize Cyclic Prefix (Cyclic Prefix, CP) intersymbol interference (ISI) that antagonism optical fiber dispersion brings is gone, general CP takies the ratio of Frame up to 25%, causes the serious waste of resource; Moreover; the sinc function of the corresponding frequency domain of time domain rectangle window shaping function of OFDM; it have very high limit imitate should; band internal power can be caused to leak; cause serious inter-sub-carrier interference (ICI), thus will propose very strict requirement, in order to avoid inter-user interference then needs to add certain protection interval to the time domain of PON up-link/frequency domain synchronization; spectrum efficiency is declined, and improves reception cost and the complexity of system.

Multi-carrier modulation technology based on filter (group) utilizes filter (group) technology to carry out filter process to the signal band of OFDM by subcarrier or signal band or Resource Block etc., OFDM can be promoted to more than 40dB lower than the side mode suppression ratio of 20dB.Based on the multi-carrier modulation technology of filter (group) retaining that traditional OFDM resisting chromatic dispersion performance is good, speed is high, on the basis of bandwidth flexible allocation, not only have good performance to ISI and ICI, improve the receptivity of system; On this basis, the problem that spectrum resource utilance is low is brought owing to eliminating interpolation CP based on the multi-carrier modulation technology of filter (group), and the out-of-band power utilizing bank of filters to reduce signal leaks, therefore compare OFDM, it can realize higher spectrum efficiency and transmission rate.

Through the retrieval to existing document, from the Cvijetic in U.S. NEC laboratory, the people such as N published thesis on Journal of Lightwave Technology periodical in 2012 " Terabit Optical AccessBased on WDM-OFDMA-PON (the T bit-level optical access network based on WDM-OFDMA-PON) ".In the document author show first time can the transmission system of WDM-OFDMA-PON of 1.2Tb/s symmetrical transmission.But; due to the side mode suppression ratio that OFDM itself is very low; this system is in order to ensure that the upward signal from each ONU does not disturb; need to retain certain frequency domain protection interval; reduce spectrum efficiency and the flexibility of Access Network; and the effective data rate adding the system of reducing of CP in OFDM herein, be unfavorable for the lifting of up-link transmission rate.

Find through retrieval again, the people such as H.Ming-Fang from U.S. NEC laboratory published thesis " A Novel Symmetric Lightwave Centralized WDM-OFDM-PONArchitecture with OFDM-Remodulated ONUs and a Coherent Receiver OLT (a kind of WDM-OFDM-PON system utilizing ONU end OFDM remodulates and coherent reception based on light source centralized system) " in ECOC meeting in 2011.It is at upgoing O NU end, by adjustment radio frequency source and then the remodulates realizing upward signal, and adopts the device of coherent reception at OLT end, can realize the reception of upward signal by frequency-selecting effect on light.But, the program still cannot overcome the intrinsic problem of OFDM itself, very responsive to frequency shift (FS) in system OFDM, in order to ensure the quality of reception from remodulates signal, sacrifice spectrum efficiency, and system receiving terminal device cost is too high, do not meet the low cost requirement of upgrading required for Access Network.

Summary of the invention

For defect of the prior art, the object of this invention is to provide a kind of passive optical network uplink transmission system based on filter (group) multi-carrier modulation technology.This system uplink optical network unit (ONU) holds employing based on the multi-carrier modulation technology of filter (group) with the performance of elevator system and spectrum efficiency, and utilizes up LASER Light Source and optical modulator module as transmitter.Signal from each optical network unit is passed through branched system Optical Fiber Transmission to optical line terminal by distant-end node, the existing passive optical network uplink transmission system of this structure compatible, is easy to realize and upgrading.

According to a kind of passive optical network uplink transmission system based on filter multi-carrier modulation technology provided by the invention, comprise: optical line terminal, branched system optical fiber, distant-end node, some distribution type fiber-optics and some optical network units, wherein, user profile utilizes and is transferred to distant-end node based on after the multi-carrier modulation of filter by distribution type fiber-optic by each optical network unit, signal from each optical network unit is passed through branched system Optical Fiber Transmission to optical line terminal by distant-end node, each receiver that signal to be sent into optical line terminal by demultiplexing by optical line terminal again realizes the reception of signal.

Preferably, described optical network unit comprise connect successively Media Access Control Module, based on the multi-carrier modulation module of filter and optical modulator module;

The described multi-carrier modulation module based on filter, for carrying out the described multi-carrier modulation based on filter, specifically comprise: produce in electrical domain based on filter multicarrier analog signal using as up modulation signal for driving optical modulator module, realized the transmitting of the up multi-carrier modulation data based on filter by modulation.

Preferably, described optical line terminal comprises some uplink user data receiver modules, photoelectric detector, demodulation multiplexer and image intensifer, wherein, uplink user data receiver module, photoelectric detector, demodulation multiplexer, image intensifer connect successively, realize the reception of upstream data.

Preferably, described distant-end node processes by uploading to optical line terminal by branched system optical fiber after distribution type fiber-optic for the upstream data realizing different optical network unit.

Preferably, the described multi-carrier modulation based on filter, comprising: filter bank multi-carrier modulation technique FBMC, the orthogonal frequency division multiplexi OQAM-OFDM, the general filtering multi-carrier modulation technology UFMC or broad sense frequency multiplexing technique GFDM that modulate based on offset quadrature.

Preferably, the multiplex mode of uplink user adopt wave division multiplexing WDM, the wavelength division multiplexing Stacked-WDM of wave stack, time division multiplexing tdm or time-division/wavelength division multiplexing TWDM.

Preferably, the passive optical network uplink transmission system based on filter multi-carrier modulation technology adopts the structure based on direct-detection photosystem, or adopts the structure based on coherent light system.

Preferably, the filter of described optical network unit adopts FIR filter, raised cosine filter or Gaussian filter.

Preferably, described optical modulator module adopts intensity modulated mode, or reactance modulation system.

Preferably, described distant-end node is light shunt/mixer, and adopt 1:N light shunt/mixer, N is the quantity of the optical network unit in EPON, and N value is 64,128,256,512 or 1024;

The length of Light distribation formula optical fiber and branched system optical fiber is 10km, 20km, 50km etc.;

Described image intensifer is used for amplifying the signal of decaying after optical fiber;

Demultiplexing module is optical branching device or array waveguide grating;

The described multi-carrier modulation module based on filter is photoelectric detector.

Compared with prior art, the present invention has following beneficial effect:

The present invention has transformed the modulation technique of existing passive optical network uplink, strong by multi-transceiver technology resisting chromatic dispersion ability, be easy to carry out based on the features such as channel estimating, propose first to utilize the multi-carrier modulation technology based on filter (group) to promote the multi-upstream access ability of optical access network, to realize higher upstream rate and spectrum efficiency.Compared with the EPON based on OFDM, the side mode suppression ratio of power spectrum signal is promoted more than 30dB by the present invention, reduce the interference between each user up, make passive optical network uplink transmission system antagonism intersymbol interference (ISI) and inter-sub-carrier interference (ICI) have better performance, improve the performance of system.Meanwhile, owing to saving adding of Cyclic Prefix (CP), the transmission rate that support of the present invention is higher, meets current EPON to higher rate and the demand being with large bandwidth.

Accompanying drawing explanation

By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:

Fig. 1 is for the present invention is based on the structural representation of the uplink system of the multi-carrier modulation EPON of filter (group).

Fig. 2 is the structure of the network illustrated based on WDM-PON and SWDM-PON, to prove the compatibility of the present invention to different EPON.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some changes and improvements can also be made.These all belong to protection scope of the present invention.

The invention provides a kind of passive optical network uplink transmission system based on filter (group) multi-carrier modulation technology, comprise: optical line terminal, branched system optical fiber, distant-end node, some distribution type fiber-optics and some optical network units, wherein each optical network unit utilizes optical modulator module to be transferred to distant-end node by distribution type fiber-optic after user profile is utilized the multi-carrier modulation based on filter (group), signal from each optical network unit is passed through branched system Optical Fiber Transmission to optical line terminal by distant-end node, each receiver that signal to be sent into optical line terminal by demultiplexing by optical line terminal again realizes the reception of signal.The present invention utilizes and makes up link have good resisting chromatic dispersion ability based on filter (group) multi-carrier modulation technology, antagonism intersymbol interference and inter-sub-carrier interference have good performance, up-link can support more high transfer rate and spectrum efficiency, and reduces the interference between each user up.

As shown in Figure 1, system provided by the invention comprises: optical line terminal, branched system optical fiber, distant-end node, some distribution type fiber-optics and some optical network units, wherein: optical network unit is primarily of Media Access Control Module, based on the multi-carrier modulation module of filter, optical modulator module forms, optical network unit-1, optical network unit-2, (N can value be 64 to optical network unit-N, 128, 256, 512 or 1024) be connected with distant-end node by distribution type fiber-optic, wherein N is determined by optical network unit number, one end that the signal of N number of optical network unit sends into branched system optical fiber is transmitted by distant-end node, the other end of branched system optical fiber is connected with optical line terminal, optical line terminal comprises uplink user data receiver module, photoelectric detector, demodulation multiplexer and image intensifer.

Optical network unit is primarily of Media Access Control Module, the multi-carrier modulation module based on filter, optical modulator module composition, adopt the multi-carrier modulation method based on filter, particularly, Media Access Control Module is for controlling generation and the management of the user data converging to optical network unit-i, i=1,2 ..., N.Multi-carrier modulation module based on filter is modulated the data that Media Access Control Module produces.At the transmitting terminal of the multi-carrier modulation based on filter, through serioparallel exchange, by the mapping of the user data after Media Access Control Module in optical network unit-i through M contrast system (M=1,2,4,16,64 etc.), after multi-carrier modulation and filter process, obtain filtered signal, concrete step depends on concrete modulator approach.Herein, all adjustable based on the multi-carrier modulation sub-carriers number of filter, the parameter of filter etc., particularly will according to flexible allocation such as the data stream statistics characteristics of the bandwidth demand of number of users, user, user, at utmost to promote the performance of the multi-carrier modulation optical access network based on filter.Modulated terminal produce in electrical domain based on filter multicarrier analog signal using as up modulation signal for driving optical modulator, realized the transmitting of the up multi-carrier modulation data based on filter by methods such as directly modulation/intensity modulated.

Optical line terminal comprises: image intensifer, demodulation multiplexer, some photoelectric detectors and some uplink user data receiver modules.Optical line terminal is connected with distant-end node by branched system optical fiber.Image intensifer is used for carrying out light amplification to the signal of decaying after branched system Optical Fiber Transmission, send into the demultiplexing that demodulation multiplexer carries out up multiplexed signals, N road signal is sent into respective photoelectric detector and converts the signal of telecommunication to, then send into uplink user data receiver module.Wherein, the corresponding optical network unit of uplink user data receiver module primary responsibility recovers based on the demodulation of the multi-carrier upstream modulating data of filter.

Distant-end node uploads to optical line terminal by the upstream data after distribution type fiber-optic by branched system optical fiber for the upstream data realizing different optical network unit and processes.

Orthogonal frequency division multiplexi (OQAM-OFDM), general filtering multi-carrier modulation technology (UFMC), broad sense frequency multiplexing technique (GFDM) etc. that multi-carrier modulation technology based on filter can be filter bank multi-carrier modulation technique (FBMC), modulate based on offset quadrature.

The filter of up optical network unit can adopt FIR filter, such as Chebyshev's FIR filter, also (root mean square) raised cosine filter, Gaussian filter etc. can be adopted, specifically depend on the selection of the concrete multi-carrier modulation based on filter, and the Parameter adjustable joints such as filter passband width, cut-off frequency.

The multiplex mode of uplink user can adopt the wavelength division multiplexing (Stacked-WDM) of wavelength division multiplexing (WDM), wave stack, time division multiplexing (TDM), time-division/wavelength division multiplexing (TWDM) etc., concrete multiplex mode will determine the formation of distant-end node and optical line terminal, such as wavelength division multiplexing, distant-end node utilizes multiplexing for up multi-wavelength of the first array waveguide grating, and optical line terminal utilizes the second array waveguide grating for the demultiplexing of up multi-wavelength; For the wavelength division multiplexing of wave stack, distant-end node utilizes optical combiner for the coupling of up multi-wavelength, and optical line terminal utilizes array waveguide grating for the demultiplexing of up multi-wavelength.

Native system can adopt the structure based on direct-detection photosystem, also can adopt the structure based on coherent light system.

Up optical modulator module can adopt intensity modulated mode, and such as Mach once obtained modulator (MZM), utilized external LASER Light Source to be biased voltage and modulated, also can adopt reactance modulation system, such as Distributed Feedback Laser, VCSEL laser etc.Light source has tunable wave length function, for realizing the Data Modulation of different optical node to different wave length.Especially, when adopting coherent light system, then need to adopt light I/Q modulator or electric I/Q modulator to add optical modulator etc.

It is photoelectric detector that the up multi-carrier data based on filter receives light modular converter, such as, can adopt APD photoelectric detector, PIN photoelectric detector etc.Especially, if adopt coherent light system, then need 90 degree of optical mixer units and balance photoelectric detector.

Described first media control module launches situation for the data controlling upstream data. signals.

Distant-end node can be light shunt/mixer, adopt 1:N light shunt/mixer, N is the quantity of the optical network unit in EPON, N value is 64,128,256,512 or 1024 (settings such as the length of Transmission Fibers, the power budget of system in the number Main Basis system of concrete ONU), array waveguide grating can also be adopted, for realizing the wavelength division multiplexing from each user uplink signal.

The length of Light distribation formula optical fiber and branched system optical fiber is 10km, 20km, 50km etc.;

Receiving terminal image intensifer is used for amplifying the signal of decaying after optical fiber, and it can be fiber amplifier, as erbium-doped fiber amplifier (EDFA), also can be semiconductor and image intensifer (SOA) etc.

Demultiplexing module can be optical branching device, and also can be array waveguide grating, particularly, depend on the structure of EPON, such as Time Division Multiplexing Fabric then adopts optical branching device, and WDM structure then adopts array waveguide grating.

Particularly, first data from user side in optical network unit-i converge to Media Access Control Module, then produce i-th up modulating data of optical network unit through the multi-carrier modulation module based on filter, produce the up multi-carrier modulation light modulating signal based on filter by optical modulator module.N number of optical network unit is transferred to distant-end node feeding branched system optical fiber and transmits.Signal after transmission sends into optical line terminal, first it utilize image intensifer to amplify receiving optical signals, then Wave Decomposition is realized by demodulation multiplexer multiplexing, send into N number of photoelectric detector, after converting the signal of telecommunication to, reply user side data by N number of multi-carrier modulation upstream data receiver module based on filter.

The present embodiment to adopt based on the multi-carrier modulation technology of filter as the modulation scheme of passive optical network uplink transmission system, has the following advantages:

1) the up employing of native system is based on the multi-carrier modulation technology of filter, remaining, multi-transceiver technology resisting chromatic dispersion performance is good, be easy on the basis of channel estimating, the side mode suppression ratio of traditional OFDM is improved to greater than 40dB from 20dB, significantly reduces the interference between each user up.

2) this uplink system is due to the introducing of the multi-carrier modulation technology based on filter, makes system have good performance to intersymbol interference (ISI) and inter-sub-carrier interference (ICI).

3) native system makes the out-of-band power radiation of signal significantly be suppressed by filtering technique, significantly can promote the spectrum efficiency of passive optical network uplink system, to adapt to the development trend of following optical communication.

Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make a variety of changes within the scope of the claims or revise, and this does not affect flesh and blood of the present invention.

Claims (10)

1. the passive optical network uplink transmission system based on filter multi-carrier modulation technology, it is characterized in that, comprise: optical line terminal, branched system optical fiber, distant-end node, some distribution type fiber-optics and some optical network units, wherein, user profile utilizes and is transferred to distant-end node based on after the multi-carrier modulation of filter by distribution type fiber-optic by each optical network unit, signal from each optical network unit is passed through branched system Optical Fiber Transmission to optical line terminal by distant-end node, each receiver that signal to be sent into optical line terminal by demultiplexing by optical line terminal again realizes the reception of signal.
2. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 1, it is characterized in that, described optical network unit comprise connect successively Media Access Control Module, based on the multi-carrier modulation module of filter and optical modulator module;
The described multi-carrier modulation module based on filter, for carrying out the described multi-carrier modulation based on filter, specifically comprise: produce in electrical domain based on filter multicarrier analog signal using as up modulation signal for driving optical modulator module, realized the transmitting of the up multi-carrier modulation data based on filter by modulation.
3. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 1 and 2, it is characterized in that, described optical line terminal comprises some uplink user data receiver modules, photoelectric detector, demodulation multiplexer and image intensifer, wherein, uplink user data receiver module, photoelectric detector, demodulation multiplexer, image intensifer connect successively, realize the reception of upstream data.
4. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 1, it is characterized in that, described distant-end node processes by uploading to optical line terminal by branched system optical fiber after distribution type fiber-optic for the upstream data realizing different optical network unit.
5. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 1, it is characterized in that, the described multi-carrier modulation based on filter, comprising: filter bank multi-carrier modulation technique FBMC, the orthogonal frequency division multiplexi OQAM-OFDM, the general filtering multi-carrier modulation technology UFMC or broad sense frequency multiplexing technique GFDM that modulate based on offset quadrature.
6. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 1, it is characterized in that, the multiplex mode of uplink user adopt the wavelength division multiplexing Stacked-WDM of wave division multiplexing WDM, wave stack, time division multiplexing tdm or time-division/wavelength division multiplexing TWDM.
7. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 1, it is characterized in that, passive optical network uplink transmission system based on filter multi-carrier modulation technology adopts the structure based on direct-detection photosystem, or adopts the structure based on coherent light system.
8. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 1, is characterized in that, the filter of described optical network unit adopts FIR filter, raised cosine filter or Gaussian filter.
9. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 2, is characterized in that, described optical modulator module adopts intensity modulated mode, or reactance modulation system.
10. the passive optical network uplink transmission system based on filter multi-carrier modulation technology according to claim 3, it is characterized in that, described distant-end node is light shunt/mixer, adopt 1:N light shunt/mixer, N is the quantity of the optical network unit in EPON, and N value is 64,128,256,512 or 1024;
The length of Light distribation formula optical fiber and branched system optical fiber is 10km, 20km or 50km;
Described image intensifer is used for amplifying the signal of decaying after optical fiber;
Demultiplexing module is optical branching device or array waveguide grating;
The described multi-carrier modulation module based on filter is photoelectric detector.
CN201510310157.9A 2015-06-08 2015-06-08 Uplink system of PON (Passive Optical Network) of filter based multicarrier modulation technology CN104936047A (en)

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