CN110266391A - Optical communication method, optical communication equipment and computer readable storage medium - Google Patents
Optical communication method, optical communication equipment and computer readable storage medium Download PDFInfo
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- CN110266391A CN110266391A CN201810199858.3A CN201810199858A CN110266391A CN 110266391 A CN110266391 A CN 110266391A CN 201810199858 A CN201810199858 A CN 201810199858A CN 110266391 A CN110266391 A CN 110266391A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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Abstract
Embodiment of the disclosure is related to optical communication method, optical communication equipment and computer readable storage medium.Such as, the first length based on the first optical fiber, it is the first optical network unit (ONU) distribution for spreading the first spreading code of the first signal to send to the first ONU, so that the first spreading rate of the first signal after spread spectrum and the first length are reversely related.First optical fiber is used to send optical code division multiple access (CDMA) signal to the first ONU by optical distributed network (ODN).Then, the first signal is spread using the first spreading code to generate optical cdma signal, and optical cdma signal is sent to the first ONU by the first optical fiber.
Description
Technical field
Embodiment of the disclosure relates generally to the communication technology, more particularly, to optical communication method, optical communication equipment and
Computer readable storage medium.
Background technique
In order to meet the ever-increasing capacity requirement of terminal user, next-generation passive optical network (NG-PON) should have capacity
High and big coverage area feature, while should also support the service of multiplicity.It has been proposed more using code point in NG-PON
Location (CDMA) technology.CDMA technology can converge multiple business by providing transparent, dedicated and safe physical channel simultaneously
Signal.The technology considerably increases terminal user's number that network can service, while may be implemented lower between user
Interference and higher power budget nargin.
At present, it has been already proposed to use CDMA technology converges on-off keying (OOK) signal and orthogonal frequency division multiplexing (OFDM)
Signal.In the scheme using CDMA technology convergence ofdm signal, it can be provided for dozens of digital subscriber line (DSL) user
Service.Compared with traditional PON (TDMA-PON) based on time division multiple acess (TDMA), this solution provides higher frequency spectrum effects
Rate and lower complexity.
Cdma system is substantially a spread spectrum system, and signal spectrum would generally be extended to several times or tens times.
In NG-PON, the significant chromatic dispersion that the demand to high capacity and long-distance optical fiber transmit will inevitably lead to CDMA signal is lost
Very.Up to the present, the dispersion being able to solve there are no effective solution in the PON based on CDMA (CDMA-PON)
Problem.
Summary of the invention
Generally, embodiment of the disclosure proposes optical communication method, optical communication equipment and computer readable storage medium.
In a first aspect, embodiment of the disclosure provides a kind of optical communication method.The first length based on the first optical fiber,
It is the first ONU distribution for spreading the first spreading code of the first signal to send to the first ONU, so that first after spread spectrum
First spreading rate of signal and the first length are reversely related.First optical fiber passes through light distributed network for optical line terminal (OLT)
Network (ODN) sends optical cdma signal to the first ONU.Using the first spreading code the first signal of spread spectrum to generate optical cdma signal, after
And optical cdma signal is sent to the first ONU by the first optical fiber.
In second aspect, embodiment of the disclosure provides a kind of optical communication equipment.Optical communication equipment includes controller, expands
Frequency device and optical transmitting set.Controller is configured as the first length based on the first optical fiber, for the first ONU distribution for spread to
First spreading code of the first signal that the first ONU is sent, so that the first spreading rate and first of the first signal after spread spectrum
Length is reversely related.First optical fiber is used to send optical cdma signal to the first ONU by ODN.Frequency multiplier is configured as utilizing the
One spreading code spreads the first signal, to generate optical cdma signal.Optical transmitting set is configured as through the first optical fiber, to the first ONU
Send optical cdma signal.
In the third aspect, embodiment of the disclosure provides a kind of computer readable storage medium, is stored thereon with computer
Program.Computer program includes instruction, which execute processor according to first aspect when being executed by processor
Method.
It should be appreciated that content described in Summary is not intended to limit the key or again of the embodiment of the present disclosure
Feature is wanted, it is also non-for limiting the scope of the present disclosure.Other features of the disclosure will be easy to understand by description below.
Detailed description of the invention
It refers to the following detailed description in conjunction with the accompanying drawings, the above and other feature, advantage and aspect of each embodiment of the disclosure
It will be apparent.In the accompanying drawings, the same or similar appended drawing reference indicates the same or similar element, in which:
Fig. 1 shows the example optical communication network that embodiment of the disclosure can be implemented within；
Fig. 2 shows the exemplary arrangements according to the optical communication networks of some embodiments of the disclosure；
Fig. 3 shows the example knot of single-side belt CDMA (SSB-CDMA) modulator according to some embodiments of the disclosure
Structure；
Fig. 4 shows the other exemplary construction of the SSB-CDMA modulator of certain other embodiments according to the disclosure；
Fig. 5 (a) to Fig. 5 (i) shows the eye figure of the signal restored at each ONU in exemplary arrangement shown in Fig. 2；
Fig. 6 (a) shows double-side band CDMA (DSB-CDMA) signal in exemplary arrangement shown in Fig. 2 and restores at ONU
Eye figure, and Fig. 6 (b) shows the eye figure that SSB-CDMA signal in exemplary arrangement shown in Fig. 2 restores at ONU；
Fig. 7 shows the other exemplary arrangement of the optical communication network of certain other embodiments according to the disclosure；
Fig. 8 (a) to Fig. 8 (d) shows the eye figure of the DSL signal restored at each ONU in exemplary arrangement shown in Fig. 7；
Fig. 9 shows the flow chart of the exemplary method of some embodiments according to the disclosure；And
Figure 10 shows the block diagram for being suitable for realizing the device of some embodiments of the disclosure.
Specific embodiment
Some example embodiments are described below with reference to the accompanying drawings.Although showing some embodiments of the disclosure in attached drawing,
It should be understood, however, that the disclosure can be realized by various forms, and should not be construed as being limited to illustrate here
Embodiment, providing these embodiments on the contrary is in order to more thorough and be fully understood by the disclosure.It should be understood that this public affairs
Being given for example only property of the accompanying drawings and embodiments effect opened, is not intended to limit the protection scope of the disclosure.
Term " passive optical network " as used herein or " PON " refer to the optical distributed network (ODN) included by it by such as
The passive devices such as optical splitter and optical fiber composition, without any active device.
Term " optical communication equipment " as used herein, which refers in optical communication network, to carry out light with optical network unit (ONU)
Any appropriate equipment or entity of communication.It is convenient to discuss, in certain embodiments, led to using optical line terminal (OLT) as light
Believe the example of equipment.
Term " optical line terminal " as used herein or " OLT " refer to that it is terminal user that service providing node is used as in PON
The equipment of service is provided.OLT can for example provide electro-optic conversion function, so that data be sent by the optical fiber in ODN.
Term " optical network unit " as used herein or " ONU ", which refer to, to be connected by optical fiber with OLT to receive from OLT's
The client node of user data.
Term " circuit " as used herein refers to below one or more:
(a) only hardware circuit implementation (such as only implementation of analog and/or digital circuit)；And
(b) combination of hardware circuit and software, such as (if applicable): (i) analog and/or digital hardware circuit with it is soft
The combination of part/firmware, and (ii) hardware processor arbitrary portion and software (including operate such that together such as OLT or
Other calculate digital signal processor, software and the memory that the devices such as equipment perform various functions)；And
(c) a part of hardware circuit and/or processor, such as microprocessor or microprocessor, it is required that software (example
Such as firmware) for operating, but software is not being needed for that can not have software when operating.
The definition of circuit is suitable for this term all usage scenarios (including any claim) in this application.Make
For another example, term " circuit " as used herein also covers only hardware circuit or processor (or multiple processors) or hard
The implementation of a part or its bundled software or firmware of part circuit or processor.For example, if applicable in specific rights
It is required that element, term " circuit " also covers based band integrated circuit or processor integrated circuit or OLT or other are calculated in equipment
Similar integrated circuit.
Term " includes " as used herein and its deformation are that opening includes, i.e., " including but not limited to ".Term "based"
It is " being based at least partially on ".Term " one embodiment " expression " at least one embodiment "；Term " another embodiment " indicates
" at least one other embodiment ".The related definition of other terms provides in will be described below.
In NG-PON, being capable of providing and covering the coverage area of more terminal users is basic demand, especially in agriculture
In village area or comprehensive Metro access networks.According to the relevant regulations of 10 gigabit PON (XG-PON) standards, the light of terminal user
Fine distance can be up to 40km.However, the demand of this long-distance optical fiber transmission will inevitably lead to dispersion distortion.
Inventors noted that in TDMA-PON system, it can be using dispersion compensating fiber (DCF) and based on number letter
The balanced device of number processing (DSP) mitigates distorted signals caused by fibre-optical dispersion.For example, can be in optical line terminal (OLT)
DCF, the dispersion generated in transmission process for compensated optical signal are set.But DCF normal length is fixed, thus dispersion is mended
It repays ability generally also to fix, is difficult the optical network unit (ONU) for supporting that fiber distance is different.Balanced device based on DSP is generally also
It places in the olt.The balanced device can provide stronger dispersion compensation ability.However, balanced device based on DSP similar with DCF
Fixed dispersion compensation is generally also only provided.
Inventor is also noted that in CDMA-PON, the data of multiple ONU are multiplexed in the time domain using CDMA technology one
It rises.Different ONU is due to different at a distance from OLT, so the effect of dispersion that experience is different, these effect of dispersions interweave one
It rises.Above-mentioned dispersion compensation device used in TDMA-PON system can not cope with the light of the biggish ONU of range difference in CDMA-PON
Fine chromatic dispersion problem.
It was recognized by the inventor that the dispersion of optical fiber is related with the transmission rate of data and transmission bandwidth.The transmission rate of data
Or transmission bandwidth is bigger, then generated dispersion distortion is bigger in data transmission procedure.Meanwhile the effect of dispersion of optical fiber is also
It is related with fiber distance (or fiber lengths).Fiber distance is remoter, is more obvious by the effect of dispersion caused by optical fiber.
Embodiment of the disclosure proposes a kind of mode of self-adjusted block spreading code based on distance, to mitigate optical fiber color
Distorted signals caused by dissipating.According to which, OLT distributes spreading code based on the fiber lengths between ONU for ONU, so that
The spreading rate of signal after must spreading is reversely related to fiber lengths.That is, the optical fiber between OLT and ONU is longer,
OLT is the spreading code that ONU distribution keeps the spreading rate of the signal after spread spectrum lower.In this way, it is possible to be substantially reduced due to light
Fibre is apart from too long caused dispersion distortion.
Fig. 1 shows the example optical communication network 100 that embodiment of the disclosure can be implemented within.As shown, light
Communication network 100 includes OLT 110 and ONU 120-1,120-2 and 120-3 (being referred to as ONU 120).OLT 110 and ONU
It is communicated between 120 by optical distributed network (ODN) 130.ODN 130 includes optical splitter 135, OLT 110 and optical splitter 135
It is connected by feeder fiber 140, optical splitter 135 and ONU 120-1,120-2 and 120-3 pass through profile fiber 145-1,145-
2 are connected with 145-3 (being referred to as profile fiber 145).
It should be understood that only having no intention to propose any restrictions for illustrative purposes, showing optical communication net in Fig. 1
It include OLT and three ONU in network 100.In the implementation, optical communication network 100 may include any an appropriate number of OLT
And ONU.It should also be understood that being shown in ODN 130 in Fig. 1 includes an optical splitter, this is also merely for the sake of illustration purpose
And have no intention to propose any restrictions.ODN 130 may include any an appropriate number of optical splitter, to meet different business need
It asks.
It can be used between OLT 110 and ONU 120 by the communication of ODN 130 and be currently known or develop in the future any
Appropriate optical communication technique.In the presently disclosed embodiments, OLT 110 will be sent to the number of multiple ONU 120 using CDMA technology
According to being multiplexed together.In this multiplex process, OLT 110 can distribute corresponding spreading code for each ONU 120.Spreading code
Distribution can be executed by the controller (not shown) in OLT 110.The example of spreading code includes but is not limited to Walsh
(Walsh) code of code, permanent envelope zero auto-correlation (CAZAC) sequence, ZC (Zadoff-Chu) sequence etc. with orthogonal property.
As an example, following equation (1), which can be used, in OLT 110 generates Walsh code:
In accordance with an embodiment of the present disclosure, OLT 110 is when distributing spreading code, consider between ONU 120 optical fiber (such as
Including feeder fiber 140 and profile fiber 145) length so that the code of the CDMA signal after the allocated spreading code spread spectrum
Piece rate is reversely related to fiber lengths.A specific example is discussed below with reference to table 1.
Table 1 shows the sample implementation that the Walsh code that code length is 8 is distributed to different ONU 120 by OLT 110,
Wherein S indicates raw data rate.
Table 1
As shown in table 2, in code 1 into code 8, any two adjacent chips of code 2 are all different, so the code after the spread spectrum of code 2
Piece rate is 8S.Two adjacent chips of code 3 are identical, therefore are reduced to 8S/2 using the spreading rate after this yard spread spectrum.Similarly,
Spreading rate corresponding to code 4, code 5 and code 7 is respectively 8S/2,8S/4 and 8S/4.This is attributed to the inherent characteristic of Walsh code,
Because having the longer Walsh code of code length is generated by the shorter Walsh code of code length and its radix-minus-one complement.
In order to reduce distortion related with dispersion, if Walsh code can be divided by OLT 110 according to corresponding spreading rate
Dry group, and it is suitably allocated to the terminal user with different fiber distances (or length).For example, using code 1, code 6 and code 8
Spreading rate after spread spectrum is 8S (higher), so these three codes can be divided into one group, distributes to the relatively close (example of fiber distance
Such as, 10km) ONU 120.Spreading rate corresponding to code 2 and code 3 is 8S/2 (slightly lower), the two codes are divided into one group, point
The ONU 120 of dispensing fiber distance slightly remote (for example, 20km).Spreading rate 8S/4 corresponding to code 5 and code 7 is minimum, so can
To distribute to the ONU 120 of fiber distance farthest (for example, 30km).
Fig. 2 shows the exemplary arrangements 200 according to the optical communication networks 100 of some embodiments of the disclosure.In this example
In, OLT 110 is connected to the optical splitter 135 in ODN 130, optical splitter 135 by same feeder fiber 140 (long 18km)
ONU 120-1,120- are connected to by profile fiber 145-1,145-2 and 145-3 of long respectively 7km, 17km and 2km respectively
2 and 120-3.
OLT 210 is according to the length of optical fiber associated with each ONU 120-1,120-2 and 120-3, especially accordingly
The length of profile fiber 145-1,145-2 and 145-3 be each ONU 120-1,120-2 and the corresponding spread spectrum of 120-3 distribution
Code.For example, the spreading code that OLT 110 is distributed is 32 following Walsh codes:
Spreading code 1:
[1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,
1,1,-1,-1,1]；
Spreading code 2:
[1,1,1,1,1,1,1,1,-1,-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1,1,-1,-1,-1,-
1,-1,-1,-1,-1]；
Spreading code 3:
[1,-1,-1,1,1,-1,-1,1,-1,1,1,-1,-1,1,1,-1,1,-1,-1,1,1,-1,-1,1,-1,1,1,-
1,-1,1,1,-1]。
In 110 side OLT, ONU is sent to using 1 to 3 pairs of spreading code by frequency multiplier 205-1,205-2 and 205-3 respectively
The data flow of 120-1,120-2 and 120-3 are spread.These data flows can be modulated using any appropriate modulation system.
The example of modulation system may include digital modulation, the modulation of the amplitude shift keying (ASK) of such as on-off keying (OOK), or can be with
Including analog-modulated, such as quadrature amplitude modulation (16QAM), quadrature phase shift keying (QPSK) etc..
Signal after spread spectrum is multiplexed together by multiplexer 210, to be combined into CDMA signal in the time domain.CDMA signal
Launch by optical transmitting set 215.The CDMA signal can be electric signal, can pass through electro-optic conversion by optical transmitting set 215
Convert thereof into optical cdma signal.
In certain embodiments, before being emitted by optical transmitting set 215, the bandwidth of CDMA signal can be made to reduce,
To further decrease fiber dispersion effects.For example, SSB-CDMA can be generated using single-side belt CDMA (SSB-CDMA) technology
Signal.Compared to double-side band CDMA (DSB-CDMA) signal, the bandwidth of SSB-CDMA signal can reduce half, such as can be from
64GHz is down to 32GHz, to significantly reduce the effect of dispersion of optical fiber.
It can implement above-mentioned SSB-CDMA modulation in any suitable manner.As an example, can be in the optical transmitting set of OLT 110
In include SSB-CDMA modulator (not shown).SSB-CDMA modulator uses double drive modulator, such as double drive Mach-
Zehnder modulator (DD-MZM), to implement SSB-CDMA modulation.Fig. 3 is shown according to some embodiments of the disclosure
The exemplary construction 300 of SSB-CDMA modulator.In structure 300, SSB-CDMA modulator includes DD-MZM 305, output electricity
The equation (2) that field can be expressed as:
Wherein, VπIndicate the half-wave voltage of DD-MZM 305, V1(t) and V2(t) each of DD-MZM 305 is respectively indicated
The electric drive signal on road, and EinIndicate that the electric field strength of input, form are exp (j ωcT), wherein ωcIndicate light carrier
Frequency.
In this example, the electric signal V after raw electrical signal S (t) is multiplied with spreading code1(t) as DD-MZM's 305
One driving signal.Meanwhile by Hilbert transformer 310 to multiplied result V1(t) Hilbert transform is executed, telecommunications is obtained
Number V2(t), as another driving signal of DD-MZM 305.Driving signal V is utilized as a result,1(t) and V2(t), 305 DD-MZM
The light pulse signal issued to laser 315 is adjusted, to generate light SSB-CDMA signal.
As shown, when each raw electrical signal S (t) is arrived, Hilbert will be carried out to the electric signal after spread spectrum
Transformation.In some embodiments it is possible to simplify aforesaid operations, to further increase treatment effeciency.Fig. 4 is shown according to this public affairs
Another exemplary construction 400 of the SSB-CDMA modulator for the certain other embodiments opened.
In this example, the electric signal V after still raw electrical signal S (t) being multiplied with spreading code1(t) it is used as DD-MZM
305 driving signal.The difference is that, Hilbert transformer 310 is only to spread spectrum with structure 300 shown in Fig. 3
Code carries out Hilbert transform.Signal after the spreading code of Hilbert transform is multiplied with raw electrical signal S (t) is as DD-
Another driving signal V of MZM 3052(t).By this method, operand is substantially reduced, treatment effeciency is improved.
In order to further increase treatment effeciency, the spreading code through Hilbert transform can be precalculated and be stored.This
Sample does not need all implementation Hilbert transforms, to enormously simplify SSB-CDMA tune when each original signal S (t) is arrived
DSP operation in device processed.
Next, the optical cdma signal that OLT 110 is issued is transmitted by the feeder fiber 140 of 18km long with continued reference to Fig. 2
To after optical splitter 135, it is transferred to via profile fiber 145-1,145-2 and 145-3 that length is respectively 7km, 17km and 2km
ONU 120-1,120-2 and 120-3.
At receiving end ONU 120-1,120-2 and 120-3, photodetector (PD) 220-1,220-2 and 220-3 (is referred to as
The optical cdma signal received is converted to by electric CDMA signal by directly detection for photodetector or PD 220).Then, respectively
It is identical above-mentioned as used in 110 side of despreader 225-1,225-2 and 225-3 (being referred to as despreader 225) use and OLT
1 to 3 pairs of electricity CDMA signals of spreading code are despread.Sampling in the duration of obtained each symbol is respectively in addition
Device 230-1,230-2 and 230-3 (being referred to as adder 230) are added together, to restore the data of terminal user.
In accordance with an embodiment of the present disclosure, spreading code used in OLT 110 is based on the fiber lengths between ONU 120
Come what is distributed, so that the spreading rate of the signal after spread spectrum is reversely related to fiber lengths, to significantly reduce optical fiber
Effect of dispersion.
Fig. 5 (a) to Fig. 5 (i) is shown in arrangement 200 shown in Fig. 2 to be restored at ONU 120-1,120-2 and 120-3
Signal eye figure, wherein Fig. 5 (a) to Fig. 5 (c) shows the optical fiber that spreading code 1 is respectively used to 20km, 25km and 35km distance
Eye figure when transmission, Fig. 5 (d) to Fig. 5 (f) show the optical fiber transmission that spreading code 2 is respectively used to 20km, 25km and 35km distance
When eye figure, Fig. 5 (g) to Fig. 5 (i) show spreading code 3 be respectively used to 20km, 25km and 35km distance optical fiber transmission when
Eye figure.
In this example, original signal have passed through OOK modulation.Optical fiber transmission for 35km, it is clear that spreading code 1 and spread spectrum
Code 3 is not enough to fight corresponding distorted signals, because their eye figure closes.Therefore, the spread spectrum minimum using spreading rate
Code 2 come spread via 35km fiber lengths transmit the data for being sent to OLT 120-2.Similarly, spreading code 1 can be used to spread
The data that fiber distance is OLT 120-1 are sent to, because spreading code 3 is not suitable for the optical fiber transmission of 25km.For shortest
The optical fiber of 20km transmits, and all spreading codes 1 to 3 can provide service for the OLT 120-3 of the distance.
Fig. 6 (a) and Fig. 6 (b) is respectively illustrated in arrangement 200 shown in Fig. 2 using the letter of SSB-CDMA modulation front and back
Number eye figure, the eye figure of DSB-CDMA signal when wherein Fig. 6 (a) is shown not using SSB-CDMA modulation, Fig. 6 (b) shows
The eye figure of SSB-CDMA signal.As shown, compared with DSB-CDMA signal, the eye figure of SSB-CDMA signal is bigger, from
And further improve the signal performance of long-distance optical fiber transmission.
Fig. 7 shows another exemplary arrangement 700 of the optical communication network 100 of certain other embodiments according to the disclosure.
In this example, OLT 110 uses SSB-CDMA modulation technique and code allocation plan appropriate for apart from different ONU 120
Service is provided.As shown in fig. 7, the two data streams for being sent to ONU 120-1 and 120-2 are fed respectively to digital subscriber line
(DSL) transmitter 705-1 and 705-2, to generate corresponding Discrete Multitone (DMT) signal.The bandwidth of each dmt signal is about
16QAM and QPSK modulation has been respectively adopted in 250MHz.
ONU 120-1 and 120-2 share 18km feeder fiber 140, corresponding to profile fiber 145-1 and 145-2
Length be respectively 2km and 17km.Correspondingly, OLT 110 is, for example, that ONU 120-1 and 120-2 are assigned with 32 following expansions
Frequency code 4 and 5:
Spreading code 4:
[1,-1,-1,1,1,-1,-1,1,-1,1,1,-1,-1,1,1,-1,1,-1,-1,1,1,-1,-1,1,-1,1,1,-
1,-1,1,1,-1]；
Spreading code 5:
[1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,
1,1,-1,-1,1]。
Signal after frequency multiplier 205-1 and 205-2 is spread using spreading code 4 and 5 is multiplexed in one in multiplexer 210
It rises, forms the CDMA signal with about 16GHz bandwidth.In this example, optical transmitting set 215 executes SSB-CDMA modulation,
To which electric CDMA signal is converted to light SSB-CDMA signal, it is then emitted to the feeder fiber 140 of 18km.
At optical splitter 135, optical cdma signal is divided into two-way, respectively by corresponding profile fiber 145-1 and
145-2 is transferred to ONU 120-1 and 120-2.PD 220-1 and 220-2 at ONU 120-1 and 120-2 turns optical cdma signal
It is changed to electric signal, is then despread by corresponding despreader 225-1 and 225-2.The each symbol obtained after despreading continues
Sampling in time is superimposed at adder 230-1 and 230-2.The dmt signal recovered is by twisted pair to 710-1
Client premises equipment (CPE) 715-1 and 715-2, which is sent to, with 710-2 (being referred to as twisted pair to 710) (is referred to as client
Premises equipment or CPE 715).CPE can carry out demodulation equilibrium to dmt signal by internal DSL modem, thus
Restoring user data.
Fig. 8 (a) to Fig. 8 (d) shows the signal restored at ONU 120-1 and 120-2 in arrangement 700 shown in Fig. 7
Eye figure, wherein Fig. 8 (a) and Fig. 8 (b) shows optical fiber of the spreading code 4 for 20km distance and transmits and SSB- is respectively adopted
Eye figure when CDMA modulation and DSB-CDMA modulation, Fig. 8 (c) and Fig. 8 (d) show optical fiber of the spreading code 5 for 35km distance
Transmit and be respectively adopted eye figure when SSB-CDMA modulation and DSB-CDMA modulation.As shown, for the optical fiber of 20km
Transmission, when using SSB-CDMA modulation, the available relatively good performance of spreading code 3.Optical fiber transmission for 35km, is being adopted
When being modulated with SSB-CDMA, the available relatively good performance of spreading code 5.
Fig. 9 shows the flow chart of the method 900 according to some embodiments of the disclosure.Method 900 can be arbitrarily suitable
Implement at optical communication equipment, such as can implement in Fig. 1 at OLT 110 shown in Fig. 8.It is convenient to discuss, it below will knot
It closes Fig. 1 to Fig. 8 and describes method 900.
As shown in figure 9, in frame 905, based on being included in ODN 130 between ONU 120-1 (referred to as " the first ONU ")
Optical fiber (referred to as " the first optical fiber ") length (referred to as " the first length "), be the first ONU distribution for spreading to the first ONU
The spreading code (referred to as " the first spreading code ") of the signal (referred to as " the first signal ") of transmission, so that the first signal after spread spectrum
Spreading rate (referred to as " the first spreading rate ") is reversely related to the first length.
First optical fiber is used to send optical cdma signal to the first ONU by ODN, can be for example including OLT 110 and light
Distribution between feeder fiber 140 and optical splitter 135 between splitter 135 and the first ONU (for example, ONU 120-1)
Optical fiber 145.Correspondingly, the length of profile fiber 145 can be based at least partially on to distribute the first spreading code.
In frame 910, the first signal is spread using the first spreading code, to generate optical cdma signal.In frame 915, pass through first
Optical fiber sends optical cdma signal to the first ONU.
In some embodiments it is possible to select from spreading code set based on the first length compared with threshold length
One spreading code.For example, it may be determined that whether the first length is more than threshold length.It can be in response to determining that the first length is more than threshold value
Length selects the first spreading code from spreading code set, so that the first spreading rate of the first signal after spread spectrum is lower than threshold value
Rate.Depending on specific implementation, threshold rates can be set to any appropriate value.For example, threshold rates can be set to
Lower than some value of spreading rate when being spread using other spreading codes in spreading code set.In certain embodiments, it spreads
The code length of spreading code in code collection conjunction can be equal.
Threshold length can be endowed any appropriate value.The first ONU and another ONU will be sent to using CDMA technology
The data-reusing of 120-2 (referred to as " the 2nd ONU ") is together in the embodiment to generate optical cdma signal, which can be with
Length (referred to as " the second length ") of optical fiber (referred to as " the second optical fiber ") between OLT 110 and the 2nd ONU is associated.
As an example, can be using the second length of the second optical fiber as threshold length.It in this example, can be in response to true
The first length that second length of fixed second optical fiber is less than or equal to the first optical fiber select from spreading code set for spread spectrum to
The spreading code (referred to as " the second spreading code ") of the signal (referred to as " second signal ") sent to the 2nd ONU, so that after spread spectrum
The spreading rate (referred to as " the second spreading rate ") of second signal is higher than threshold rates.Then, it can use the expansion of the second spreading code
Frequency second signal, and optical cdma signal is generated based on the first signal and the second signal after spread spectrum.
In certain embodiments, optical cdma signal is SSB-CDMA signal.In some embodiments it is possible to by OLT 110
In double drive modulator (for example, DD-MZM 305) generate light SSB-CDMA signal.For example, the first signal can be electric signal
(referred to as " the first electric signal ").Double drive modulator utilizes Hilbert transform, is based at least partially on the first electric signal, spread spectrum
Rear the first electric signal and the first spreading code generate light SSB-CDMA signal.
As an example, can be by least believing the first electric signal after spread spectrum as a driving of double drive modulator
Number and using the product of the first electric signal and the first spreading code through Hilbert transform as another drive of double drive modulator
Dynamic signal, to generate light SSB-CDMA signal.In the embodiment that the first signal and the second signal are multiplexed and are sent together, the
Binary signal is also possible to electric signal (referred to as " the second electric signal ").It in these embodiments, can be by the first telecommunications after spread spectrum
A driving signal number with the sum of the second electric signal as double drive modulator, and by the first electric signal and through Hilbert
The product of first spreading code of transformation and the sum of products conduct of the second electric signal and the second spreading code through Hilbert transform
Another driving signal of double drive modulator.
In certain embodiments, the first spreading code through Hilbert transform and/or the second spreading code can precalculate
And it stores.For example, can store in OLT 110 or in the equipment that other OLT 110 can be accessed in any suitable manner.
It should be understood that operation performed by the OLT 110 described above in association with Fig. 1 to Fig. 8 and relevant feature are equally applicable
It in method 900, and has same effect, detail repeats no more.
In certain embodiments, the device (such as OLT 110) for being able to carry out method 900 may include for executing method
The corresponding component of 900 each steps.These components can be realized in any suitable manner.For example, circuit or software can be passed through
Module is realized.
In certain embodiments, it is that the first ONU is distributed for expanding that device, which includes for the first length based on the first optical fiber,
First spreading code of first signal of the frequency after be sent to the first ONU so that the first spreading rate of the first signal after spread spectrum and
Reversely relevant component, the first optical fiber are used to send optical cdma signal to the first ONU by ODN first length；For utilizing the
One spreading code spreads the first signal with the third contact of a total solar or lunar eclipse into the component of CDMA signal；And for being sent by the first optical fiber to the first ONU
The component of optical cdma signal.
In certain embodiments, the component for distributing the first spreading code includes: for long based on the first length and threshold value
The comparison of degree selects the component of the first spreading code from spreading code set.
In certain embodiments, the code length of the spreading code in spreading code set is equal.
In certain embodiments, the component for selecting the first spreading code include: for determine the first length whether be more than
The component of threshold length；And in response to determining that the first length is more than that threshold length selects the first expansion from spreading code set
Frequency code is so that the first spreading rate of the first signal after spread spectrum is lower than the component of threshold rates.
In certain embodiments, OLT sends optical cdma signal, the 2nd ONU to the 2nd ONU via the second optical fiber in ODN
Different from the first ONU, and threshold length is associated with the second length of the second optical fiber.
In certain embodiments, the component for generating optical cdma signal includes: in response to determining the second optical fiber
The first length that second length is less than or equal to the first optical fiber is selected from spreading code set for spreading to send to the 2nd ONU
Second signal the second spreading code so that spread spectrum after second signal the second spreading rate be higher than threshold rates component；
For the component using the second spreading code spread spectrum second signal；And for raw based on the first signal and the second signal after spread spectrum
At the component of optical cdma signal.
In certain embodiments, ODN includes optical splitter, and OLT, which sends optical cdma to the first ONU via optical splitter, to be believed
Number, and optical fiber includes the profile fiber between the feeder fiber between OLT and optical splitter and optical splitter and the first ONU.
In certain embodiments, the component for distributing the first spreading code includes: for being based at least partially on distribution light
The component of fine the first spreading code of length allocation.
In certain embodiments, optical cdma signal is optical SSB CDMA (SSB-CDMA) signal.
In certain embodiments, the first signal is the first electric signal.Component for generating optical cdma signal includes: to be used for
After being based at least partially on the first electric signal, spread spectrum using the double drive modulator in OLT and using Hilbert transform
The first electric signal and the first spreading code generate light SSB-CDMA signal component.
In certain embodiments, for being based at least partially on the first electric signal and first after the first electric signal, spread spectrum
The component that spreading code generates light SSB-CDMA signal includes: for by least using the first electric signal after spread spectrum as double drive
One driving signal of modulator and at least the product of the first electric signal and the first spreading code through Hilbert transform is made
The component of light SSB-CDMA signal is generated for another driving signal of double drive modulator.
Figure 10 shows the block diagram for being suitable for realizing the device 1000 of embodiment of the disclosure.Device 1000 can be used to real
The optical communication equipment of operate as described herein and function, such as the OLT 110 referring to figs. 1 to Figure 10 description can now be implemented.
As shown in Figure 10, device 1000 includes processor 1010.The operations and functions of 1010 control device 1000 of processor.
For example, in certain embodiments, processor 1010 can be by means of the instruction that is stored in coupled memory 1020
1030 execute various operations.Memory 1020 can be any suitable type suitable for local technical environment, and can
Memory device, magnetic memory to be realized using any suitable data storage technology, including but not limited to based on semiconductor
Part and system, light storage device and system.Although illustrate only a memory cell in Figure 10, in device 1000
The memory cell that can have multiple physics different.
Processor 1010 can be any suitable type suitable for local technical environment, and may include but unlimited
In general purpose computer, special purpose computer, microcontroller, digital signal controller (DSP) and based on controller multicore control
One or more of device framework.Device 1000 also may include multiple processors 1010.Device 1000 can be by means of optical fiber
Or cable etc. realizes sending and receiving for information.
Processor 1010 makes device 1000 execute the OLT 110 described above with reference to Fig. 1 to Fig. 9 and executing instruction
Relevant operation and feature.It is suitable for device 1000 above with reference to all features described in Fig. 1 to Fig. 9, it is no longer superfluous herein
It states.
It should be appreciated that in accordance with an embodiment of the present disclosure, ONU 120 can be executed as receiving end and as transmitting terminal
The corresponding handling and operation of OLT 110, and there is same function and effect, detail repeats no more.
In general, the various example embodiments of the disclosure can hardware or special circuit, software, logic or its
What implement in combination.Some aspects can be implemented within hardware, and other aspects can by controller, microprocessor or
Other are calculated implements in the firmware or software that equipment executes.When the various aspects of embodiment of the disclosure are illustrated or described as frame
When figure, flow chart or other certain graphical representations of use, it will be understood that box described herein, device, system, techniques or methods can
Using as unrestricted example in hardware, software, firmware, special circuit or logic, common hardware or controller or other in terms of
It calculates and implements in equipment or its certain combination.
As an example, embodiment of the disclosure can be described in the context of machine-executable instruction, machine can be held
Row instruction such as includes in the program module executed in the device on the true or virtual processor of target.In general,
Program module includes routine, program, library, object, class, component, data structure etc., executes specific task or realizes specific
Abstract data structure.In embodiments, the function of program module can merge between described program module or
Segmentation.Machine-executable instruction for program module can execute in local or distributed apparatus.In distributed apparatus
In, program module can be located locally in remote medium storage the two.
The computer program code of method used to implement the present disclosure can be write with one or more programming languages.These
Computer program code can be supplied to the processing of general purpose computer, special purpose computer or other programmable data processing units
Device so that program code when being executed by computer or other programmable data processing units, cause flow chart and/
Or function/operation specified in block diagram is carried out.Program code can completely on computers, part on computers, conduct
Independent software package, part are on computers and part is held on a remote computer or server on the remote computer or completely
Row.
In the context of the disclosure, computer program code or related data can be carried by any suitable carrier,
So that unit or processor are able to carry out above-described various handling and operation.The example of carrier include signal,
Computer-readable medium, etc..
The example of signal may include the transmitting signal of electricity, light, radio, sound or other forms, such as carrier wave, infrared
Signal etc..
Computer-readable medium can be include or storage be used for or about instruction execution system, device or equipment journey
Any tangible medium of sequence.Computer-readable medium can be computer-readable signal media or computer readable storage medium.
Computer-readable medium can include but is not limited to electronics, magnetic, optical, electromagnetism, infrared or semiconductor system, dress
It sets or equipment or its any appropriate combination.The more detailed example of computer readable storage medium includes having one or more
It is the electrical connection of conducting wire, portable computer diskette, hard disk, random access memories (RAM), read-only memory (ROM), erasable
Except programmable read only memory (EPROM or flash memory), light storage device, magnetic storage apparatus or its any appropriate combination.
In addition, although operation is depicted with particular order, this simultaneously should not be construed and require this generic operation to show
Particular order is completed with sequential order, or executes the operation of all diagrams to obtain expected result.In some cases, more
Task or parallel processing can be beneficial.Similarly, although discussed above contain certain specific implementation details, this is not
It should be interpreted that any invention of limitation or the scope of the claims, and should be interpreted that the specific embodiment that can be directed to specific invention
Description.Certain features described in the context of separated embodiment can also be with combined implementation single real in this specification
It applies in example.Conversely, the various features described in the context of single embodiment can also discretely multiple embodiments or
Implement in any appropriate sub-portfolio.
Although with specific to the language description of structural features and or methods of action theme, but it is to be understood that institute
The theme limited in attached claim is not limited to above-described special characteristic or movement.On the contrary, above-described specific spy
Movement of seeking peace is disclosed as the exemplary forms for realizing claim.
Claims (24)
1. a kind of optical communication method, comprising:
The first length based on the first optical fiber is the first optical network unit (ONU) distribution for spreading to send out to the first ONU
First spreading code of the first signal sent, so that the first spreading rate of the first signal after spread spectrum and first length are anti-
To correlation, first optical fiber is used to send optical code division multiple access (CDMA) letter by the first ONU of optical distributed network (ODN) Xiang Suoshu
Number；
First signal is spread using first spreading code, to generate the optical cdma signal；And
By first optical fiber, the first ONU of Xiang Suoshu sends the optical cdma signal.
2. according to the method described in claim 1, wherein distributing first spreading code and including:
Based on first length compared with threshold length, first spreading code is selected from spreading code set.
3. according to the method described in claim 2, wherein the code length of the spreading code in the spreading code set conjunction is equal.
4. according to the method described in claim 2, wherein selecting first spreading code to include:
Determine whether first length is more than the threshold length；And
It is more than the threshold length in response to determination first length, first spread spectrum is selected from the spreading code set
Code, so that first spreading rate of the first signal after spread spectrum is lower than threshold rates.
5. according to the method described in claim 2, wherein the OLT is sent via the second optical fiber in the ODN to the 2nd ONU
The optical cdma signal, the 2nd ONU are different from the first ONU, and the threshold length and second optical fiber
Second length is associated.
6. according to the method described in claim 5, wherein generating the optical cdma signal and including:
It is less than or equal to first length of first optical fiber in response to second length of determination second optical fiber,
Selection is used to spread the second spreading code of the second signal to send to the 2nd ONU from the spreading code set, so that
Second spreading rate of the second signal after must spreading is higher than threshold rates；
The second signal is spread using second spreading code；And
Based on the first signal and the second signal after spread spectrum, the optical cdma signal is generated.
7. the OLT is via the optical splitter according to the method described in claim 1, wherein the ODN includes optical splitter
The optical cdma signal is sent to the first ONU, and the optical fiber includes the feedback between the OLT and the optical splitter
Linear light fibre and the profile fiber between the optical splitter and the first ONU.
8. according to the method described in claim 7, wherein distributing first spreading code and including:
It is based at least partially on the length of the profile fiber, distributes first spreading code.
9. according to the method described in claim 1, wherein the optical cdma signal is optical SSB CDMA (SSB-CDMA) signal.
10. according to the method described in claim 9, wherein first signal is the first electric signal, and generating the light
SSB-CDMA signal includes:
By the double drive modulator in the OLT, using Hilbert transform, be based at least partially on first electric signal,
The first electric signal and first spreading code after spread spectrum generate the smooth SSB-CDMA signal.
11. according to the method described in claim 10, wherein based on the first electric signal after first electric signal, the spread spectrum
The optical cdma signal is generated with first spreading code includes:
By at least using the first electric signal after the spread spectrum as a driving signal of the double drive modulator and extremely
The product of first electric signal described in major general and the first spreading code through Hilbert transform is another as the double drive modulator
One driving signal, to generate the smooth SSB-CDMA signal.
12. a kind of optical communication equipment, comprising:
Controller is configured as the first length based on the first optical fiber, for the first optical network unit (ONU) distribution for spread to
First spreading code of the first signal sent to the first ONU, so that the first spreading rate of the first signal after spread spectrum
Reversely related to first length, first optical fiber is used to send light by the first ONU of optical distributed network (ODN) Xiang Suoshu
CDMA (CDMA) signal；
Frequency multiplier is configured as spreading first signal using first spreading code, to generate the optical cdma signal；With
And
Optical transmitting set is configured as through first optical fiber, and the first ONU of Xiang Suoshu sends the optical cdma signal.
13. equipment according to claim 12, wherein the controller is configured as:
Based on first length compared with threshold length, first spreading code is selected from spreading code set.
14. equipment according to claim 13, wherein the code length of the spreading code in spreading code set conjunction is equal.
15. equipment according to claim 13, wherein the controller is configured as:
Determine whether first length is more than the threshold length；And
It is more than the threshold length in response to determination first length, first spread spectrum is selected from the spreading code set
Code, so that first spreading rate of the first signal after spread spectrum is lower than threshold rates.
16. equipment according to claim 13, wherein the equipment is via the second optical fiber in the ODN to the 2nd ONU
The optical cdma signal is sent, the 2nd ONU is different from the first ONU, and the threshold length and second light
The second fine length is associated.
17. equipment according to claim 16, wherein the controller is additionally configured in response to determination second light
Fine second length is less than or equal to first length of first optical fiber, selects to use from the spreading code set
In the second spreading code for spreading the second signal to send to the 2nd ONU, so that second of the second signal after spread spectrum
Spreading rate is higher than threshold rates；
Wherein the frequency multiplier is additionally configured to spread the second signal using second spreading code；And
The equipment further includes multiplexer, and the multiplexer is configured as the first signal and the second signal after multiplexed spread spectrum with life
At the optical cdma signal.
18. equipment according to claim 12, wherein the ODN includes optical splitter, the equipment is via the light point
Road device sends the optical cdma signal to the first ONU, and the optical fiber include the equipment and the optical splitter it
Between feeder fiber and the optical splitter and the first ONU between profile fiber.
19. equipment according to claim 18, wherein the controller is configured as:
It is based at least partially on the length of the profile fiber, distributes first spreading code.
20. equipment according to claim 12, wherein the optical cdma signal is optical SSB CDMA (SSB-CDMA) letter
Number.
21. equipment according to claim 20, wherein first signal is the first electric signal, and the equipment is also wrapped
It includes:
Double drive modulator is configured as being based at least partially on first electric signal, the expansion using Hilbert transform
The first electric signal and first spreading code after frequency generate the smooth SSB-CDMA signal.
22. equipment according to claim 21, wherein the double drive modulator is also configured to
By at least using the first electric signal after the spread spectrum as a driving signal of the double drive modulator and extremely
The product of first electric signal described in major general and the first spreading code through Hilbert transform is another as the double drive modulator
One driving signal, to generate the smooth SSB-CDMA signal.
23. a kind of device, comprising:
At least one processor；And
At least one processor, at least one processor include computer program code, at least one processor and
The computer program code is configured as executing described device according to claim
Method described in any one of 1-11.
24. a kind of computer readable storage medium, is stored thereon with computer program, the computer program includes instruction, institute
Instruction is stated when being executed by processor, executes the processor according to claim 1 to method described in any one of 11.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040208564A1 (en) * | 2002-03-01 | 2004-10-21 | Helbing Rene P. | Spectral dispersion compensation in optical code division multiple access (OCDMA) communication system |
| CN1725721A (en) * | 2005-07-19 | 2006-01-25 | 电子科技大学 | Passive optical network based on optical CDMA multitechnology |
| CN101848403A (en) * | 2010-04-23 | 2010-09-29 | 中兴通讯股份有限公司 | Passive optical network system and optical line terminal based on optical code division multiple access multiplexing |
| CN102611668A (en) * | 2011-01-25 | 2012-07-25 | 中兴通讯股份有限公司 | Data transmission method of orthogonal frequency division multiplexing (OFDM) passive optical network and optical line terminal (OLT) |
| CN103973368A (en) * | 2014-03-17 | 2014-08-06 | 烽火通信科技股份有限公司 | Adaptive dispersion compensation adjustment method |
| CN105207715A (en) * | 2015-08-13 | 2015-12-30 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Chaotic sequence based CDMA (Code Division Multiple Access) access method |
| CN105871462A (en) * | 2016-05-17 | 2016-08-17 | 华南理工大学 | Visible light communication positioning method based on CDMA modulation and positioning system adopted by same |
-
2018
- 2018-03-12 CN CN201810199858.3A patent/CN110266391B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040208564A1 (en) * | 2002-03-01 | 2004-10-21 | Helbing Rene P. | Spectral dispersion compensation in optical code division multiple access (OCDMA) communication system |
| CN1725721A (en) * | 2005-07-19 | 2006-01-25 | 电子科技大学 | Passive optical network based on optical CDMA multitechnology |
| CN101848403A (en) * | 2010-04-23 | 2010-09-29 | 中兴通讯股份有限公司 | Passive optical network system and optical line terminal based on optical code division multiple access multiplexing |
| CN102611668A (en) * | 2011-01-25 | 2012-07-25 | 中兴通讯股份有限公司 | Data transmission method of orthogonal frequency division multiplexing (OFDM) passive optical network and optical line terminal (OLT) |
| CN103973368A (en) * | 2014-03-17 | 2014-08-06 | 烽火通信科技股份有限公司 | Adaptive dispersion compensation adjustment method |
| CN105207715A (en) * | 2015-08-13 | 2015-12-30 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Chaotic sequence based CDMA (Code Division Multiple Access) access method |
| CN105871462A (en) * | 2016-05-17 | 2016-08-17 | 华南理工大学 | Visible light communication positioning method based on CDMA modulation and positioning system adopted by same |
Non-Patent Citations (1)
| Title |
|---|
| Y.ZOUINE ET AL: "Analyses of constraints on high speed optical code division multiplexing access (OCDMA) link parameters due to fiber optic chromatic dispersion", 《OPTICS COMMUNICATIONS》 * |
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