CN110267127A - Method, apparatus and computer-readable medium for Low-cost passive optical network - Google Patents
Method, apparatus and computer-readable medium for Low-cost passive optical network Download PDFInfo
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- CN110267127A CN110267127A CN201810200567.1A CN201810200567A CN110267127A CN 110267127 A CN110267127 A CN 110267127A CN 201810200567 A CN201810200567 A CN 201810200567A CN 110267127 A CN110267127 A CN 110267127A
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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
- H04B10/27—Arrangements for networking
-
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
Abstract
Embodiment of the disclosure provides a kind of method at optical line terminal.This method comprises: based on reference sequences and from the received reception sequence of optical network unit, to determine optical line terminal for the balance parameters for receiving signal progress signal equalization, receiving sequence is that optical network unit is generated after optical fiber transmits using the reference sequences for sending parameter transmission.This method further include: based on balance parameters and parameter is sent, to determine the transmitting-receiving performance level after carrying out signal equalization.This method further comprises: being lower than threshold level in response to transmitting-receiving performance level, sends message to optical network unit to indicate that optical network unit adjustment sends parameter.Embodiment of the disclosure additionally provides corresponding optical line terminal, a kind of method realized at optical network unit and corresponding optical network unit and a kind of computer-readable medium.Embodiment of the disclosure improves signal transmission quality, and use cost is effectively and the device of low bandwidth supports high speed passive optical network.
Description
Technical field
Embodiment of the disclosure is generally related to optical communication field, and relates more particularly to one kind in passive optical network
Method, apparatus and computer-readable medium.
Background technique
In passive optical network (PON), optical network unit (ONU) is existed using the direct modulation laser (DML) of low cost
It will be advantageous in terms of save the cost.But swash compared to the electro-absorption modulation of higher cost (EAM) laser and external modulation
Light device (EML) will inherently generate chirp (chirp) effect using DML laser in optical network unit.So-called chirp effect
It should refer to that the frequency of signal varies over.
In addition, using pulse amplitude modulation (for example, PAM4/8 etc.) of more level, the size of chirp
Distinct symbols mode for input signal be it is inconsistent, i.e., chirp degree depend on inputted signal itself.This
The inconsistent chirp of kind and the bandwidth of device and fiber channel limit and nonlinear effect is mixed in together, causes in receiving side
(for example, optical line terminal OLT) will will receive the signal with multiple distortion sources.This correctly recovers sending side to receiving side
The signal that (for example, optical network unit) is sent proposes stern challenge.
Summary of the invention
Embodiment of the disclosure be related to a kind of method at optical line terminal, a kind of method at optical network unit,
A kind of optical line terminal, a kind of optical network unit and a kind of computer-readable medium.
In the disclosure in a first aspect, providing a kind of method at optical line terminal.This method comprises: based on reference
Sequence and from the received reception sequence of optical network unit, to determine that optical line terminal is used to carry out signal equalization to receiving signal
Balance parameters, receiving sequence is that optical network unit is generated after optical fiber transmits using the reference sequences that parameter is sent are sent.It should
Method further include: based on balance parameters and parameter is sent, to determine the transmitting-receiving performance level after carrying out signal equalization.This method
Further comprise: in response to transmitting-receiving performance level lower than threshold level, sending message to optical network unit to indicate optical-fiber network list
Member adjustment sends parameter.
In the second aspect of the disclosure, a kind of method at optical network unit is provided, this method comprises: using sending
Parameter sends reference sequences to optical line terminal via optical fiber.This method further include: receive message, the message from optical line terminal
Indicate that optical network unit adjustment sends parameter.This method further comprises: transmission parameter is adjusted based on message.
In the third aspect of the disclosure, a kind of optical line terminal is provided.The optical line terminal includes at least one processing
Device and at least one processor including computer program instructions.At least one processor and computer program instructions are configured
For together at least one processor, so that optical line terminal executes the method according to first aspect.
In the fourth aspect of the disclosure, a kind of optical network unit is provided.The optical network unit includes at least one processing
Device and at least one processor including computer program instructions.At least one processor and computer program instructions are configured
For together at least one processor, so that optical network unit executes the method according to second aspect.
At the 5th aspect of the disclosure, a kind of computer-readable medium is provided.The computer-readable medium includes machine
Executable instruction, machine-executable instruction make machine execute the method according to first aspect when executed.
At the 6th aspect of the disclosure, a kind of computer-readable medium is provided.The computer-readable medium includes machine
Executable instruction, machine-executable instruction make machine execute the method according to second aspect when executed.
Detailed description of the invention
The following detailed description is read with reference to the accompanying drawings, above-mentioned and other purposes, the feature of embodiment of the disclosure
It will be easy to understand with advantage.In the accompanying drawings, several implementations of the disclosure are shown by way of example rather than limitation
Example, in which:
Fig. 1 shows embodiment of the disclosure can be in the schematic diagram for the communication system being wherein implemented.
The global performance that Fig. 2 shows according to an embodiment of the present disclosure between optical line terminal and optical network unit is excellent
The schematic diagram of change process.
Fig. 3 shows according to an embodiment of the present disclosure another of overall importance between optical line terminal and optical network unit
The schematic diagram of energy optimization process.
Fig. 4 shows the schematic diagram of global parameter optimization according to an embodiment of the present disclosure.
Fig. 5 shows the flow chart of the method according to an embodiment of the present disclosure implemented at optical line terminal.
Fig. 6 shows the flow chart of the method implemented at optical network unit according to the embodiment of the present disclosure.
Fig. 7 A, Fig. 7 B and Fig. 7 C are shown using obtained illustrative experimental result in accordance with an embodiment of the present disclosure
Schematic diagram.
Fig. 8 shows the simplified block diagram for being suitable for realizing the equipment of embodiment of the disclosure.
Through all attached drawings, same or similar reference label is used to represent same or similar component.
Specific embodiment
Several exemplary embodiments shown in below with reference to the accompanying drawings describe the principle and spirit of the disclosure.It should
Understand, describes these specific embodiments merely to enabling those skilled in the art to more fully understand and realizing this public affairs
It opens, and not limits the scope of the present disclosure in any way.
As it is used herein, term " includes " and its similar term should be understood as that opening includes, i.e., " including but not
It is limited to ".Term "based" should be understood as " being based at least partially on ".Term " one embodiment " or " embodiment " should manage
Solution is " at least one embodiment ".Term " first ", " second " etc. may refer to different or identical object.Further below may be used
It can include other specific and implicit definition.As it is used herein, term " determination " covers various movements.Example
Such as, " determination " may include operation, calculating, processing, export, investigation, lookup (for example, in table, database or another data knot
Searched in structure), find out.In addition, " determination " may include receiving (for example, receiving information), access (for example, access memory
In data) etc..In addition, " determination " may include parsing, selection, selection, foundation etc..
Terms used herein " passive optical network " 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.Terms used herein " optical communication equipment "
Refer to any appropriate equipment or entity that can carry out optic communication in optical communication network with optical network unit (ONU).For discussion side
Just, in certain embodiments, using optical line terminal (OLT) as the example of optical communication equipment.
Terms used herein " optical line terminal " 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.
Terms used herein " optical network unit " or " ONU ", which refer to, to be connected by optical fiber with OLT to receive the user data from OLT
Client node.
Terms used herein " circuit " refer to below one or more: (a) only hardware circuit implementation is (such as only
The implementation of analog and/or digital circuit)；And (b) combination of hardware circuit and software, such as (if applicable): (i) mould
Quasi- and/or digital hardware circuits and software/firmware combinations, and (ii) hardware processor arbitrary portion and software (including
Operate such that together OLT or other calculate digital signal processor, software that the devices such as equipment perform various functions and
Memory)；And (c) hardware circuit and/or processor, a part of such as microprocessor or microprocessor, it is required that soft
Part (such as firmware) is not needing software for that can not have software when operating for 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.
Fig. 1 shows embodiment of the disclosure can be in the schematic diagram for the communication system 100 being wherein implemented.Such as Fig. 1 institute
Show, communication system 100 can be a part of passive optical network comprising optical line terminal 110 and optical network unit 120.Light
It can communicate between line terminal 110 and optical network unit 120.For example, optical line terminal 110 can pass through downlink
130 send signal to optical network unit 120, and optical network unit 120 can be by uplink 140 to optical line terminal 110
Send signal.
In the case where optical network unit 120 sends signal condition to optical line terminal 110 by uplink 140, optical-fiber network list
Member 120 will send the signal using parameter is sent.Sending parameter can be the set being made of multiple transmission parameters.For example,
The transmission parameter of optical network unit 120 may include the drive amplitude of used laser, bias current, modulation depth, with
And transmission power, etc..Signal transmitted by optical network unit 120 is after the transmission by optical fiber link by optical line terminal
110 are received.
In the transmission, since there are nonideal Bandwidth-Constrained and nonlinear effect, optical line terminals for device and optical fiber
110 receive will be distortion signal.In order to recover the original signal of the transmission of optical network unit 120 from the signal of distortion,
As shown in Figure 1, optical line terminal 110 includes signal equalization module 115.In general, signal equalization module 115 by using
Balance parameters carry out signal equalization to the signal of distortion, so as to recover the signal of the transmission of optical network unit 120.Equilibrium ginseng
Number can be the set including multiple balance parameters.
It should be appreciated that signal equalization module 115 can be realized by the combination of both hardware, software or hardware and software.
Further, it will be appreciated that although illustrating only an optical network unit 120, in the communication system 100, optical line terminal in Fig. 1
110 can correspond to multiple optical network units including optical network unit 120.Multiple optical network unit can for its
Signal, such as light burst (burst) are sent to optical line terminal 110 respectively in the time slot of distribution.It will be noted that due to different
Optical network unit has different device and optical fiber link, therefore optical line terminal 110 can be with for different optical network units
Use different balance parameters.
As mentioned above, the passive light in some passive optical network, especially in the DML laser using low cost
In network, it will there are chirps.So-called chirp is a kind of signal, and frequency is as the time increases (upper chirp) or reduces
(lower chirp).After the phase in optical fiber transmission to amplitude modulation (PM-AM) conversion, chirp will finally limit passive light
Data transmission in network.This is the understanding to the first level of chirp, for the number of two kinds of level (for example, 0 and 1) is used only
According to format, this understanding is enough.
But with the further research to chirp, it will be found that when data format evolves to more level from binary system
When data format (for example, PMA4/8 or duobinary system, duobinary system PAM4, DMT/OFDM etc.), the size of chirp for
The pattern of symbol of different input signals will be it is inconsistent, herein inconsistent refers to chirp (or degree) dependent on defeated
Enter signal itself.In addition, chirp can not be individually processed in signals transmission.On the contrary, actual non-ideal
In fiber channel, the linear damage (for example, intersymbol interference, chirp) and nonlinear distortion (for example, amplifier saturation) of signal
It interacts with each other and is superimposed.
For example, the signal that pattern of symbol (combinations of several symbols) is " 010 " is input into DML laser and will generate
" wavelength/frequency " drift, and drift value is different from the drift value as caused by the signal that signal sequence is " 030 ".Chirp
The inconsistent inconsistent dispersion that will will lead to signal sequence, this makes traditional post-equalization (for example, LMS algorithm) based on statistics
It will be helpless in face of dynamically flowing symbol combination.Therefore, the chirp of more level input signals is inconsistent, imperfect
Channel condition (for example, non-linear and Bandwidth-Constrained) bring Overlapping Symbol and distortion the problem of, this is for existing signal
Recovery scheme is insoluble.
In order to alleviate chirp or dispersion in a manner of low cost, some schemes have been proposed at present, but they are all
Have the shortcomings that respective.In a kind of known arrangement, using there is no the Electroabsorption Modulated Laser (EAM) of chirp or outside
(EML) modulates to substitute DML laser in portion, but they are with high costs.In another known arrangement, dispersion position is used
Shifting fiber (DSF) may be helpful, but need the DSF using different length for the optical network unit of different distance,
And higher cost.In another known arrangement, using zero-dispersion wavelength, but they may be occupied.At other
In known arrangement, reduce the modulation depth of laser (for example, DML), but this sacrifices the modulation efficiency in passive optical network
And power budget.In more other known arrangements, using nonlinear equalization methods (for example, Volterra filter), but
It is that it will occupy a large amount of digital signal processor (DSP) resource when in view of high-order harmonic wave.
In addition, method listed above both for binary system (0,1) format, that is, input it is with uniformity, therefore
Chirp is also with uniformity.But the signal of more level for the PAM4 for example with 0,1,2,3 amplitude leyels, such as above
Described, chirp will be inconsistent.In addition, it is contemplated that the intersymbol interference as caused by bandwidth limitation and nonlinear effect
(ISI), more amplitude leyels will merge.For example, needing to judge 7 kinds of width in receiving side for duobinary system PAM4 signal
Level is spent, some amplitude leyel therein may be to be combined and obtained due to various distortions by other amplitude leyels.Therefore, Zhou
Sing/diversity of dispersion bring than only with 0 and 1 the more complicated problem of the problems in traditional passive optical-fiber network.
In view of the above analysis and research of inventor, embodiment of the disclosure provides a kind of side at optical line terminal
Method, a kind of method at optical network unit, a kind of optical line terminal, a kind of optical network unit and one kind are computer-readable
Medium, to solve above-mentioned technical problem and other problems.By embodiment of the disclosure, can in passive optical network with
Both optical line terminal and optical network unit coordinate mode and adaptive signal equalization is executed in receiving side, thus realize pair
In the transmitting-receiving performance level of the global optimization of receiving-transmitting sides.In some embodiments, which can be based on people
Artificial neural networks (ANN) Lai Jinhang.The example embodiment of the disclosure is described in detail hereinafter with reference to Fig. 2 to Fig. 4.
The overall situation that Fig. 2 shows according to an embodiment of the present disclosure between optical line terminal 110 and optical network unit 120
The schematic diagram of performance optimization process 200.In some embodiments, global performance optimization process 200 can pass through artificial neural network
The Optimal Parameters setting for learning to obtain receiving-transmitting sides of network, so that recipient can recover the letter of sender's transmission
Number, especially in the presence of inconsistent chirp phenomenon.
As shown in Fig. 2, optical network unit 120 sends 205 references to optical line terminal 110 via optical fiber using transmission parameter
Sequence.The reference sequences are that optical line terminal 110 and 120 both sides of optical network unit know in advance, thus as receiving side
Optical line terminal 110 at signal equalization module can be obtained based on known reference sequences and the distortion sequence received
115 carry out the balance parameters of signal equalization.In practice, since optical line terminal 110 likely corresponds to multiple optical network units
And the balance parameters of different values are used respectively, optical line terminal 110 can also identify specific optical network unit first
120, so as to be directed to the occurrence of balance parameters used in optical network unit 120 as initial equalization before direct use
Parameter value optimizes.
In some embodiments, it may include light net that optical network unit 120, which sends and sends parameter used in reference sequences,
Drive amplitude, bias current, modulation depth and transmission power of laser used in network unit 120, etc..As discussed above
, since the degree of chirp phenomenon is inconsistent for different input signals, and various nonlinear effects are for difference
The influence of input signal be also nonlinear, therefore the global performance between optical line terminal 110 and optical network unit 120
In optimization process 200, other than the balance parameters that signal equalization is carried out in addition to needing to adjust optical line terminal 110, it is also necessary to adjust
The transmission parameter of optical network unit 120, to obtain desired transmitting-receiving performance level.
With continued reference to Fig. 2, optical line terminal 110 is based on reference sequences and from the received reception sequence of optical network unit 120,
To determine that 210 optical line terminals 110 are used to the balance parameters for receiving signal progress signal equalization.Herein, receiving sequence is light
Network unit 120 is generated after optical fiber transmits using the reference sequences for sending parameter transmission.That is, receiving sequence is to mention above
The distortion sequence arrived.
It will be understood that various optimization algorithms or optimization can be used in the signal equalization module 115 of optical line terminal 110
Model determines balance parameters.These optimization algorithms or Optimized model include but is not limited to: artificial neural network (ANN), minimum
Mean square algorithm, the method for exhaustion, genetic algorithm, ant group algorithm, tabu search algorithm, simulated annealing, is based on maximal possibility estimation
The hill-climbing algorithm, etc. of greed.It will be hereafter illustrated by taking the algorithm based on artificial neural network as an example, but the reality of the disclosure
It is without being limited thereto to apply example.
As it is used herein, term " artificial neural network " refers to such a model, which can be from work
It is study in the reference sequences of training sequence to being associated between corresponding input and output, thus based on instruction after the completion of training
The parameter set got carries out signal equalization to given input signal to generate restored signal.Herein, " artificial mind
Through network " " learning network ", " learning model ", " network " or " model " can also be referred to as sometimes, these terms are in up and down
Interchangeably used.
In the embodiment using artificial neural network, the signal equalization module 115 of optical line terminal 110 can be used more
The artificial neural network of layer, each layer can have multiple neurons, and each neuron can have corresponding weight and biasing.
In order to determine that the balance parameters being used to signal progress signal equalization is received, optical line terminal 110 can determine artificial neural network
The weight of the neuron of network, biasing or both or other parameters.For example, back-propagation algorithm can be used in optical line terminal 110
The parameter (for example, weight and biasing) of neuron is optimized, so that they converge on specific value.With traditional algorithm
(for example, least mean square algorithm etc.) is compared, and has lower complexity using the equalization algorithm based on artificial neural network.This
Outside, general linear equalization algorithm is compared, the equalization algorithm based on artificial neural network can be realized the channel significantly improved and mend
Repay effect.
In some embodiments, since the property of optical fiber may be variation, for example, it may be possible to become with the variation of temperature
Change, so optical line terminal 110 can also fine-tune balance parameters to adapt to during determining balance parameters
The configured transmission of optical fiber with temperature (or other factors) fluctuation.
With continued reference to Fig. 2, optical line terminal 110 is based on balance parameters and sends parameter, to determine 215 carry out signal equalizations
Transmitting-receiving performance level later.In some embodiments, in order to synthetically embody the performance of both sender and recipient, light
Line terminal 110 first can carry out signal equalization to sequence is received using balance parameters to be equalized sequence, and determine equal
The mass parameter for the sequence that weighs, such as bit error rate.The performance level of sender can be represented due to sending parameter, and equalized sequence
Mass parameter can represent the performance level of recipient, so optical line terminal 110 can be based on the hair of optical network unit 120
The mass parameter of parameter and obtained equalized sequence is sent to obtain transmitting-receiving performance level.In this way, so that transmitting-receiving
Performance level can be quantized.
Specifically, in order to obtain the transmitting-receiving performance level of quantization, optical line terminal 110, which can be set, sends parameter and quality
Weight ratio of the parameter in transmitting-receiving performance level.For example, the weight ratio can be indicated by percentage.As an example, sending out
It, can be to the transmission higher weight ratio of parameter setting, such as 80% in the case that the performance for the side of sending is even more important.On the contrary, such as
The performance level of fruit recipient is more important, can be to the higher weight ratio of quality parameter setting, such as 80%.It is being provided with hair
After the weight ratio for sending parameter and mass parameter, optical line terminal 110 can based on send the value of parameter, the value of mass parameter and
Weight ratio calculates transmitting-receiving performance level, such as quantized value.In this way, transmitting-receiving performance level can be determined that specific value,
So as to intuitively, digitally judge the height of transmitting-receiving performance level.
With continued reference to Fig. 2, optical line terminal 110 determines whether 220 transmitting-receiving performance levels are lower than threshold level.It will be understood that
The threshold level can be preset according to specific technological accumulation and inheritance and technical requirements, embodied predetermined expectation and reached
The minimum transmitting-receiving performance level arrived, if transmitting-receiving performance level determined by optical line terminal 110 is lower than the threshold level, table
Show that optical network unit 120 is sent used in parameter and the progress signal equalization of optical line terminal 110 used in being sent
Weighing apparatus parameter also needs further to adjust and optimization.
As shown in Fig. 2, being lower than threshold level in response to transmitting-receiving performance level, optical line terminal 110 is to optical network unit 120
225 message are sent to indicate that the adjustment of optical network unit 120 sends parameter.Correspondingly, optical network unit 120 is from optical line terminal
110 receive the message, so that optical network unit 120 could be aware that sending parameter needs to adjust and how to adjust.Some
In embodiment, which can indicate to send the adjustment direction and adjustment amplitude of parameter, or can also indicate that and will send parameter
It is adjusted to particular value.In this way, it is (this blind that its transmission parameter can be blindly adjusted to avoid optical network unit 120
Mesh adjustment may cause the decline of transmitting-receiving performance level), to efficiently determine optimization transmitting-receiving performance level.It will reason
Solution, also can be used other indicating modes, embodiment of the disclosure is unrestricted in this respect.In addition, above-mentioned instruction disappears
Breath can be transmitted via the discribed downlink 130 of Fig. 1.
With continued reference to Fig. 2, optical network unit 120 adjusts 230 transmission parameters based on message, and uses adjusted hair
Parameter is sent to send 235 reference sequences again to optical line terminal 110 via optical fiber.Therefore, optical line terminal 110 can repeat to hold
Row actions described above 210 acts 215, movement 220 to carry out the determination and optimization of balance parameters again, and again really
Surely performance level is received and dispatched.In this way, optical line terminal 110 and optical network unit 120 can be iteratively performed movement
205 to movement 235, until transmitting-receiving performance level is greater than or equal to threshold level.
Fig. 3 shows another between optical line terminal and optical network unit according to an embodiment of the present disclosure and communicated
The schematic diagram of journey.During Fig. 3 description, movement 205 is same or like with Fig. 2 to movement 220, and details are not described herein again.
Here by emphasis description movement 204 to movement 250.
As shown in figure 3, being greater than or equal to threshold level, optical link in response to transmitting-receiving performance level determined by 220
Terminal 110 sends 240 message to optical network unit 120 to indicate that optical network unit 120 uses used in transmission reference sequences
Parameter is sent to send data-signal.For example, the transmission parameter may be the transmission parameter for being adjusted and being optimized several times.
In response to receiving the instruction message, optical network unit 120 is whole to optical link via optical fiber using the transmission parameter
End sends 235 data-signals.In this case, optical line terminal 110 is correspondingly using identified balance parameters to from light
The received data-signal of network unit 120 carries out signal equalization, to recover the data-signal of the transmission of optical network unit 120.
Fig. 4 shows the schematic diagram of global parameter optimization according to an embodiment of the present disclosure.As shown, use is contour
The mode of line depicts the value for the quality of reception parameter realized at optical line terminal 110.In addition, using light in Fig. 4
The transmission parameter 1 and transmission parameter 2 of network unit 120 indicate the transmission parameter of optical network unit 120 as example.For example,
Sending parameter 1 can be the drive amplitude of laser of optical network unit 120, and sends parameter 2 and can be optical network unit 120
Laser bias current.
Contour 410 to 440 respectively indicates the value of different quality of reception parameters, wherein from contour 410 to contour
The value of the quality of reception parameter of line 440 successively increases.It is preferably connect that is, 440 area encompassed of contour corresponds to
Receive the region of quality.Therefore, parameter 1 will be sent in optical network unit 120 and send the setting of parameter 2 corresponding to the contour 440
Region in when, the optimal quality of reception may be implemented at optical line terminal 110.This intuitive manner described by Fig. 4,
When determining transmitting-receiving performance level, optical line terminal 110 can be described according to the weight ratio for sending parameter and mass parameter, foundation
Contour map come reasonably determine transmitting-receiving performance level value.
Fig. 5 shows the flow chart of the method 500 according to an embodiment of the present disclosure implemented at optical line terminal.It will reason
Solution, method 500 can be implemented for example at the optical line terminal 110 as shown in Fig. 1 to Fig. 3.For convenience of description, below with reference to figure
1 to Fig. 3 is illustrated method 500.
At 505, optical line terminal 110 is based on reference sequences and from the received reception sequence of optical network unit 120, comes true
Determine optical line terminal 110 to be used to the balance parameters for receiving signal progress signal equalization.Receiving sequence is that optical network unit 120 makes
It is generated after optical fiber transmits with the reference sequences for sending parameter transmission.In some embodiments, send parameter may include with
It is at least one of lower: drive amplitude, bias current, modulation depth and the transmitting function for the laser that optical network unit 120 uses
Rate.
In some embodiments, when determining balance parameters, optical line terminal 110 can be determined for carrying out signal equalization
Artificial neural network neuron weight and biasing at least one of.In some embodiments, optical line terminal 110 can
Further to be fine-tuned to balance parameters to adapt to the configured transmission of optical fiber with the fluctuation of temperature.
At 510, optical line terminal 110 be based on balance parameters and send parameter, come determine carry out signal equalization after
Receive and dispatch performance level.In some embodiments, determining that balanced ginseng can be used in optical line terminal 110 when receiving and dispatching performance level
Several pairs of reception sequences carry out signal equalizations to be equalized sequence, and based on the mass parameter for sending parameter and equalized sequence come
Obtain transmitting-receiving performance level.
In some embodiments, in order to obtain transmitting-receiving performance level, optical line terminal 110, which can be set, sends parameter and matter
Weight ratio of the parameter in transmitting-receiving performance level is measured, and by value, the value of mass parameter and the weight ratio of transmission parameter come based on
Calculate transmitting-receiving performance level.
At 515, optical line terminal 110 determines whether transmitting-receiving performance level is lower than threshold level.At 520, in response to
Determine that transmitting-receiving performance level is lower than threshold level at 515, optical line terminal 110 sends message to optical network unit 120 to refer to
Show that the adjustment of optical network unit 120 sends parameter.
In some embodiments, which can indicate to send the adjustment direction and adjustment amplitude of parameter.In other realities
It applies in example, which can also indicate that will send parameter is adjusted to particular value.
In some embodiments, in response to determining that transmitting-receiving performance level is greater than or equal to threshold level, optical link at 515
Terminal 110 can be used balance parameters and carry out signal equalization to from the received data-signal of optical network unit 120.
In some embodiments it is possible to which the device (such as optical line terminal 110) for executing method 500 may include for holding
The corresponding component of each step of row method 500.These components can be realized in any suitable manner.For example, can by circuit or
Person software module is realized.
In some embodiments, device includes: for based on reference sequences and from the received reception sequence of optical network unit
Carry out the component that determining device is used to carry out reception signal the balance parameters of signal equalization, receiving sequence is that optical network unit uses
Send what the reference sequences that parameter is sent generated after optical fiber transmits；It is carried out for being determined based on balance parameters and transmission parameter
The component of transmitting-receiving performance level after signal equalization；And for being lower than threshold level, Xiang Guang in response to transmitting-receiving performance level
Network unit sends message to indicate that optical network unit adjustment sends the component of parameter.
In some embodiments, for determining that the component of balance parameters includes: for determining for carrying out signal equalization
The component of at least one in the weight and biasing of the neuron of artificial neural network.
In some embodiments, for determining that the component of transmitting-receiving performance level includes: for using balance parameters to reception
Sequence carries out signal equalization to be equalized the component of sequence；And for based on the mass parameter for sending parameter and equalized sequence
To obtain the component of transmitting-receiving performance level.
In some embodiments, for showing that the component of transmitting-receiving performance level includes: to send parameter and quality for being arranged
The component of weight ratio of the parameter in transmitting-receiving performance level；And for based on value, the value of mass parameter and the power for sending parameter
Again than come calculate transmitting-receiving performance level component.
In some embodiments, the adjustment of instruction optical network unit sends parameter and includes at least one of the following: that instruction sends ginseng
Several adjustment directions and adjustment amplitude；And instruction is adjusted to particular value for parameter is sent.
In some embodiments, device further comprises: for being greater than or equal to threshold value water in response to transmitting-receiving performance level
It is flat, using balance parameters to the component for carrying out signal equalization from the received data-signal of optical network unit.
In some embodiments, device further comprises: for being fine-tuned balance parameters to adapt to optical fiber
Configured transmission with the fluctuation of temperature component.
In some embodiments, the driving for the laser that parameter includes at least one of the following: that optical network unit uses is sent
Amplitude, bias current, modulation depth and transmission power.
Fig. 6 shows the flow chart of the method 600 implemented at optical network unit according to the embodiment of the present disclosure.It will reason
Solution, method 600 can be implemented for example at the optical network unit 120 as shown in Fig. 1 to Fig. 3.For convenience of description, below with reference to figure
1 to Fig. 3 is illustrated method 500.
At 605, optical network unit 120 sends reference sequences to optical line terminal 110 via optical fiber using transmission parameter.
In some embodiments, it may include at least one of following for sending parameter: the driving width for the laser that optical network unit 120 uses
Degree, bias current, modulation depth and transmission power.
At 610, optical network unit 120 receives message from optical line terminal 110, which indicates optical network unit 120
Adjustment sends parameter.In some embodiments, which can indicate to send the adjustment direction and adjustment amplitude of parameter.Another
In a little embodiments, which can also indicate that will send parameter is adjusted to particular value.
At 615, optical network unit 120 adjusts transmission parameter based on message.In some embodiments, optical network unit
120, which can be used adjusted transmission parameter, sends data-signal to optical line terminal 110 via optical fiber.
In some embodiments it is possible to which the device (such as optical network unit 120) for executing method 600 may include for holding
The corresponding component of each step of row method 600.These components can be realized in any suitable manner.For example, can by circuit or
Person software module is realized.
In some embodiments, device includes: to refer to for being sent via optical fiber to optical line terminal using transmission parameter
The component of sequence；For receiving the component of message from optical line terminal, message instruction device adjustment sends parameter；And it is used for
The component for sending parameter is adjusted based on message.
In some embodiments, device further comprises: for using adjusted transmission parameter via optical fiber to light
The component of road terminal transmission data-signal.
In some embodiments, instruction device adjustment sends parameter and includes at least one of the following: that instruction sends the tune of parameter
Perfect square to adjustment amplitude；And instruction is adjusted to particular value for parameter is sent.
In some embodiments, the drive amplitude, partially that parameter includes at least one of the following: laser that device uses is sent
Set electric current, modulation depth and transmission power.
Fig. 7 A, Fig. 7 B and Fig. 7 C are shown using obtained illustrative experimental result in accordance with an embodiment of the present disclosure
Schematic diagram.In this experiment, using the DML laser of 2.5G (three dB bandwidth 2.7GHz, 10dB bandwidth 3.6GHz) Lai Shiying 10G
The PAM4 of baud rate is serviced, i.e. 20Gb/s.In addition, the experiment has used the standard single-mode fiber (SSMF) and 1:64 of 20 kms
Optical splitter.
Specifically, Fig. 7 A is shown without the directly received eye figure of any equilibrium treatment, and Fig. 7 B is shown based on tradition most
The eye figure restored after the linear equalization of small mean square algorithm, Fig. 7 C show restored eye according to an embodiment of the present disclosure
Figure.As shown, not recovered eye figure is closed completely, and the eye figure restored through conventional method is compared to directly received
Eye figure has improved to some extent.More preferably, the effect that restored eye figure according to an embodiment of the present disclosure restores is very good, shows
The eye figure (duobinary system PAM4) for having shown 7 rank level has significant improvement compared to traditional reset mode.This shows this public affairs
The embodiment opened can effectively compensate for the signal impairments due to caused by multiple distortion sources in optical fiber link.
In addition, the result of the experiment also shows that embodiment of the disclosure can obtain following advantages compared to traditional scheme.
Firstly, bit error rate greatly reduces, such as from the grade drops of 1E-2 as low as 1E-3 rank, to meet forward error correction (FEC)
Requirement.Secondly, the bias current of DML laser can substantially reduce, such as it is reduced to 80mA from 160mA, to realize
50% lower power consumption.
Generally speaking, compared to traditional scheme, embodiment of the disclosure improve significantly signal transmission quality (for example,
Reduce the bit error rate for receiving signal), use cost is effectively and the device of low bandwidth supports high speed passive optical network, realizes
The signal format of more level, saves the power consumption of laser, is adaptive to a variety of different ONT Optical Network Terminals and its laser
It (for example, DML) and can be used in different passive optical network.
Fig. 8 shows the simplified block diagram for being suitable for realizing the equipment 800 of embodiment of the disclosure.In some embodiments, if
Standby 800 can be used to realize optical line terminal, such as optical line terminal 110 shown in Fig. 1 to Fig. 3.In some embodiments,
Equipment 800 can be used to realize optical network unit, such as optical network unit 120 shown in Fig. 1 to Fig. 3.
As shown in Figure 8, equipment 800 includes controller 810.The operations and functions of the control equipment 800 of controller 810.
For example, in certain embodiments, controller 810 can be by means of the instruction 830 that is stored in coupled memory 820
Execute various operations.
Memory 820 can be any suitable type suitable for local technical environment, and can use any conjunction
Suitable data storage technology realizes that the memory device, magnetic memory device and system, light including but not limited to based on semiconductor deposit
Memory device and system.It will be appreciated that though illustrating only a memory 820 in Fig. 8, but may exist in equipment 800
The different memory cell of multiple physics.
Controller 810 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.Equipment 800 also may include multiple controllers 810.Controller 810 is coupled with transceiver 840,
Transceiver 840 can realize sending and receiving for information by means of one or more antennas 850 and/or other component.
When equipment 800 serves as optical line terminal 110, controller 810, memory 820, instruction 830 and transceiver 840 can
With compounding practice, to realize above with reference to method 500 described in Fig. 5.When equipment 800 serves as optical network unit 120, control
Device 810, memory 820, instruction 830 and transceiver 840 can be with compounding practices, to realize above with reference to method described in Fig. 6
600.It is suitable for equipment 800 above with reference to all features described in Fig. 2 to Fig. 6, details are not described herein again.
It should be noted that embodiment of the disclosure can be realized by the combination of hardware, software or software and hardware.Firmly
Part part can use special logic to realize；Software section can store in memory, by instruction execution system appropriate,
Such as microprocessor or special designs hardware execute.It will be appreciated by those skilled in the art that above-mentioned device and method can
It is realized with using computer executable instructions and/or being included in the processor control code, such as in programmable memory
Or such code is provided in the data medium of such as optics or electrical signal carrier.
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,
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 describing the operation of disclosed method in the accompanying drawings with particular order, this do not require that or
Person implies must execute these operations in this particular order, or has to carry out operation shown in whole and be just able to achieve expectation
Result.On the contrary, the step of describing in flow chart can change and execute sequence.Additionally or alternatively, it is convenient to omit Mou Xiebu
Suddenly, multiple step groups are combined into a step to execute, and/or a step is decomposed into execution of multiple steps.It shall also be noted that
It can be embodied in one apparatus according to the feature and function of two or more devices of the disclosure.Conversely, above-described
The feature and function of one device can be to be embodied by multiple devices with further division.
Although describing the disclosure by reference to several specific embodiments, but it is to be understood that it is public that the present disclosure is not limited to institutes
The specific embodiment opened.The disclosure is intended to cover in spirit and scope of the appended claims included various modifications and equivalent
Arrangement.
Claims (16)
1. a kind of method at optical line terminal, comprising:
Based on reference sequences and from the received reception sequence of optical network unit, to determine that the optical line terminal is used to dock the collection of letters
The balance parameters of signal equalization number are carried out, the sequence that receives is the ginseng that the optical network unit is sent using parameter is sent
Examine what sequence generated after optical fiber transmits；
Based on the balance parameters and the transmission parameter, to determine the transmitting-receiving performance level after carrying out the signal equalization；
And
It is lower than threshold level in response to the transmitting-receiving performance level, Xiang Suoshu optical network unit sends message to indicate the light net
Network unit adjusts the transmission parameter.
2. according to the method described in claim 1, wherein determining that the balance parameters include:
Determine at least one in the weight and biasing of the neuron for carrying out the artificial neural network of signal equalization.
3. according to the method described in claim 1, wherein determining that the transmitting-receiving performance level includes:
Signal equalization is carried out to be equalized sequence to the reception sequence using the balance parameters；And
The transmitting-receiving performance level is obtained based on the mass parameter of the transmission parameter and the equalized sequence.
4. according to the method described in claim 3, wherein showing that the transmitting-receiving performance level includes:
The weight ratio of the transmission parameter and the mass parameter in the transmitting-receiving performance level is set；And
The transmitting-receiving performance level is calculated based on value, the value of the mass parameter and the weight ratio for sending parameter.
5. according to the method described in claim 1, it includes following for wherein indicating that the optical network unit adjusts the transmission parameter
At least one of:
Indicate the adjustment direction and adjustment amplitude for sending parameter；And
The transmission parameter is adjusted to particular value by instruction.
6. according to the method described in claim 1, further comprising:
It is greater than or equal to the threshold level in response to the transmitting-receiving performance level, using the balance parameters to from the light net
The received data-signal of network unit carries out signal equalization.
7. according to the method described in claim 6, further comprising:
The balance parameters are fine-tuned to adapt to the configured transmission of the optical fiber with the fluctuation of temperature.
8. according to the method described in claim 1, wherein the transmission parameter includes at least one of the following: the optical network unit
Drive amplitude, bias current, modulation depth and the transmission power of the laser used.
9. a kind of method at optical network unit, comprising:
Reference sequences are sent to optical line terminal via optical fiber using parameter is sent；
Message is received from the optical line terminal, the message indicates that the optical network unit adjusts the transmission parameter；And
The transmission parameter is adjusted based on the message.
10. according to the method described in claim 9, further comprising:
Data-signal is sent to the optical line terminal via the optical fiber using the adjusted transmission parameter.
11. according to the method described in claim 9, it includes following for wherein indicating that the optical network unit adjusts the transmission parameter
At least one of:
Indicate the adjustment direction and adjustment amplitude for sending parameter；And
The transmission parameter is adjusted to particular value by instruction.
12. according to the method described in claim 9, wherein the transmission parameter includes at least one of the following: the optical-fiber network list
Drive amplitude, bias current, modulation depth and the transmission power for the laser that member uses.
13. a kind of optical line terminal, comprising:
At least one processor；And
At least one processor including computer program instructions, at least one processor and the computer program instructions
Be configured as, together at least one described processor so that the optical line terminal execute it is any in -8 according to claim 1
Method described in.
14. a kind of optical network unit, comprising:
At least one processor；And
At least one processor including computer program instructions, at least one processor and the computer program instructions
It is configured as, together at least one described processor, appoints so that the optical network unit is executed according in claim 9-12
Method described in one.
15. a kind of computer-readable medium, the computer-readable medium includes machine-executable instruction, and the machine is executable
Instruction makes machine execute method according to claim 1 to 8 when executed.
16. a kind of computer-readable medium, the computer-readable medium includes machine-executable instruction, and the machine is executable
Instruction makes machine execute the method according to any one of claim 9-12 when executed.
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