CN106550288B - A kind of time-delay compensation device of passive optical network, method and passive optical network - Google Patents
A kind of time-delay compensation device of passive optical network, method and passive optical network Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of time-delay compensation device of passive optical network, method and passive optical network, including the first device for being deployed in the side OLT and the second device for being deployed in the side ODN；First device includes detection light transmission unit and time delay processing unit, and detection light transmission unit is used to send detection optical signal to primary trunk optical fiber or spare trunk optical fiber；Second device includes optical splitter and reflection device；The first branch end and primary trunk fiber couples of optical splitter, the second branch end and spare trunk fiber couples, common end are coupled by reflection device with the common end of ODN；Time delay processing unit is used to obtain the first optical signal and reaches the first time information of OLT and obtain the second temporal information that the second optical signal reaches OLT, and transmits to the data of OLT and carry out delay compensation.The embodiment of the present invention can the primary, spare trunk optical fiber of real-time compensation propagation delay time, to meet front end passback to the requirement of the propagation delay time of PON.
Description
Technical field
The present invention relates to fiber optic communication field more particularly to a kind of time-delay compensation device of passive optical network, method and
Passive optical network.
Background technique
In various broadband access technologies, PON (Passive Optical Network, passive optical network) is with its capacity
Greatly, the advantages such as transmission range length, lower cost, full-service support become the contenders of next-generation broadband access network.
Fig. 1 is a kind of common structure of existing PON, OLT (optical line terminal, optical link including local side
Terminal), the ONU (optical of ODN (optical distribution network, Optical Distribution Network) and user terminal
Network unit, optical network unit).It is so-called passive to refer in ODN without containing any active electronic device and electronic power supply, entirely
Portion is made of passive devices such as such as optical splitters (English: splitter).In pon, this between OLT and ODN section optical fiber
Referred to as trunk optical fiber, and since the distance of trunk optical fiber is generally longer, and reliability requirement is higher, it usually needs it backups to it
Protection, as primary trunk optical fiber configure spare trunk optical fiber and are switched to spare trunk when primary trunk optical fiber breaks down
Optical fiber, to protect entire PON system unaffected.
Currently, PON is to carry the most competitive solution of front end return data, however, the front end based on PON returns
Scheme has higher requirement to the propagation delay time of PON, in general, the transmission time delay difference of primary path and backup path is less than
30ns is equivalent to 6 meters of optical fiber.But during real network deployment, primary trunk optical fiber and spare trunk optical fiber pass through respectively
Different pipelines, and the laying of pipeline is limited to road and the planning in city, often results in the length of primary path and backup path
Difference is greater than 6 meters, it is difficult to meet propagation delay time requirement of the front end passback to PON.
Summary of the invention
The embodiment of the invention provides a kind of time-delay compensation device of passive optical network, method and passive optical network, can
The propagation delay time of the primary, spare trunk optical fiber of real-time compensation, to meet propagation delay time requirement of the front end passback to PON.
The first aspect of the embodiment of the present invention provides a kind of delay compensation dress of passive optical network, the passive optical network packet
Include optical line terminal OLT, the primary trunk optical fiber of Optical Distribution Network ODN and the connection OLT and ODN and spare master
Dry optical fiber, the time-delay compensation device include the first device for being deployed in the side OLT and the second device for being deployed in the side ODN；
First device includes detection light transmission unit, the detection light transmission unit for primary trunk optical fiber or
Spare trunk optical fiber sends detection optical signal；
Second device includes optical splitter and reflection device；Wherein, the first branch end of the optical splitter and the master
With trunk fiber couples, the second branch end of the optical splitter and the spare trunk fiber couples, the optical splitter it is public
End is coupled by the reflection device with the common end of the ODN；
First device further includes time delay processing unit, and the time delay processing unit is reached for obtaining the first optical signal
The first time information of the OLT and the second temporal information that the second optical signal reaches the OLT is obtained, and according to described the
The data of one temporal information and the second temporal information to the OLT on the primary trunk optical fiber or the spare trunk optical fiber
Transmission carries out delay compensation；Wherein, first optical signal be the detection light through the reflection device reflect after by described point
Light device the first branch end output optical signal, second optical signal be the detection light through the reflection device reflect after by
The optical signal of the second branch end output of the optical splitter.
In conjunction with the embodiment of the present invention in a first aspect, the first implementation of the first aspect in the embodiment of the present invention
In, the time delay processing unit includes the first optical receiver module, the second optical receiver module, the first wavelength division multiplexer, the second wavelength-division
Multiplexer and processing module；Wherein,
First optical receiver module is by first wavelength division multiplexer and the primary trunk fiber couples, and described
Two optical receiver modules pass through second wavelength division multiplexer and the spare trunk fiber couples；
The processing module obtains institute for obtaining the time that first optical receiver module receives first optical signal
It states first time information, and obtains the time that second optical receiver module receives second optical signal, obtain described the
Two temporal informations, and according to the first time information and the second temporal information to the OLT in the primary trunk optical fiber or
Data transmission on the spare trunk optical fiber carries out delay compensation.
In conjunction with the first implementation of the first aspect of the embodiment of the present invention, the of the first aspect of the embodiment of the present invention
In two kinds of implementations, the detection light emitting unit includes the first optical transmitter module for emission detection optical signal；Wherein,
First optical transmitter module is coupled with first wavelength division multiplexer or second wavelength division multiplexer.
In conjunction with the first implementation of the first aspect of the first aspect or embodiment of the present invention of the embodiment of the present invention, In
In the third implementation of the first aspect of the embodiment of the present invention,
The detection light emitting unit includes that third wavelength division multiplexer and the first light for emission detection optical signal are sent out
Penetrate module；Wherein, first optical transmitter module passes through the third wavelength division multiplexer and the primary trunk optical fiber or spare
Trunk fiber couples.
In conjunction with the first aspect of the embodiment of the present invention, the first aspect of the embodiment of the present invention the first to the third realization
Any one in mode, in the 4th kind of implementation of the first aspect of the embodiment of the present invention, the processing module includes
Computational submodule, the first processing submodule and second processing submodule；Wherein,
When the computational submodule is used to be calculated according to the first time information of acquisition and second temporal information
Prolong offset；
The first processing submodule is used for according to the delay compensation value to the OLT in the primary trunk optical fiber
Data transmission carry out delay compensation.
The second processing submodule is used for according to the delay compensation value to the OLT in the spare trunk optical fiber
Data transmission carry out delay compensation.
Second aspect of the embodiment of the present invention provides a kind of delay compensation method of passive optical network, the passive optical network
Including optical line terminal OLT, the primary trunk optical fiber of Optical Distribution Network ODN and the connection OLT and ODN and spare
Trunk optical fiber,
The OLT sends detection optical signal to the primary trunk optical fiber or spare trunk optical fiber；Wherein, the detection light
Signal carries out light-splitting processing by the optical splitter in the ODN after the reflection device reflection in the ODN, obtains described primary
The first optical signal transmitted on trunk optical fiber and the second optical signal transmitted on the spare trunk optical fiber；
The OLT obtains first optical signal and reaches the first time information of the OLT and obtain second light
Signal reaches the second temporal information of the OLT；
The OLT is according to the first time information and the second temporal information to the OLT in the primary trunk optical fiber
Or the data transmission on the spare trunk optical fiber carries out delay compensation.
In conjunction with the second aspect of the embodiment of the present invention, in the first implementation of the second aspect of the embodiment of the present invention
In, the OLT includes the first optical receiver module, the second optical receiver module, the first wavelength division multiplexer and the second wavelength division multiplexer,
Wherein, first optical receiver module is by first wavelength division multiplexer and the primary trunk fiber couples, and described second
Optical receiver module passes through second wavelength division multiplexer and the spare trunk fiber couples；
Then the OLT, which obtains first optical signal and reaches the first time information of the OLT, includes:
The OLT receives first optical signal by first optical receiver module；
The OLT obtains the time that first optical receiver module receives first optical signal, when obtaining described first
Between information；
The OLT, which obtains second optical signal and reaches the second temporal information of the OLT, includes:
The OLT receives second optical signal by second optical receiver module；
The OLT obtains the time that second optical receiver module receives second optical signal, when obtaining described second
Between information.
In conjunction with the first implementation of the second aspect of the second aspect or embodiment of the present invention of the embodiment of the present invention, In
In the third implementation of the second aspect of the embodiment of the present invention, when the OLT is according to the first time information and second
Between information to the OLT on the primary trunk optical fiber or the spare trunk optical fiber data transmission carry out delay compensation packet
It includes:
The OLT is according to the first time information and the second temporal information calculation delay offset；
The OLT is according to the delay compensation value to the OLT in the primary trunk optical fiber or the spare trunk light
Data transmission on fibre carries out delay compensation.
The third aspect of the embodiment of the present invention provides a kind of passive optical network, and the passive optical network includes such as claim
The time-delay compensation device of passive optical network described in any one of 1 to 4.
In technical solution provided in an embodiment of the present invention, the embodiment of the present invention the side OLT be arranged detection light transmission unit and
Optical splitter and reflection device is arranged in the side ODN, wherein the detection optical signal that detection light transmission unit is sent in time delay processing unit
Transmitted in primary trunk optical fiber or spare trunk optical fiber, light-splitting processing carried out by optical splitter after reflection device emits, so as to
The two ways of optical signals that the side ODN obtains, thereafter, two ways of optical signals are transmitted on primary trunk optical fiber and spare trunk optical fiber respectively,
And time delay processing unit obtains two ways of optical signals and arrives separately at the temporal information of OLT can obtain optical signal in primary optical fiber and standby
With the transmission time delay difference in optical fiber, and the number according to transmission time delay difference to OLT on primary trunk optical fiber or spare trunk optical fiber
Delay compensation is carried out according to transmission.Compared with prior art, the embodiment of the present invention can obtain optical signal in primary, spare trunk in real time
Transmission time delay difference in optical fiber compensates the propagation delay time of primary trunk optical fiber and spare trunk optical fiber, to meet front end passback pair
The propagation delay time requirement of PON.
Detailed description of the invention
Fig. 1 is a kind of common structure of existing PON；
Fig. 2 is a kind of common structure of existing WDM PON；
Fig. 3 is a kind of common BBU-RRU networking structure；
Fig. 4 is a kind of common framework that PON carries front end return data；
Fig. 5 is one embodiment schematic diagram of the time-delay compensation device of passive optical network in the embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of processing module in Fig. 5；
Fig. 7 is one embodiment schematic diagram of the delay compensation method of passive optical network in the embodiment of the present invention.
Specific embodiment
The embodiment of the invention provides a kind of time-delay compensation device of passive optical network, method and passive optical network, can
The propagation delay time of the primary, spare trunk optical fiber of real-time compensation, to meet propagation delay time requirement of the front end passback to PON, individually below
It is described in detail.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those skilled in the art's every other implementation obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
Description and claims of this specification and term " first ", " second ", " third " " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so that the embodiments described herein can be in addition to illustrating herein
Or the sequence other than the content of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit
In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce
The other step or units of product or equipment inherently.
It should be noted that the embodiment of the present invention is mainly used in PON, in following some embodiments, mainly to adopt
Use wavelength-division multiplex as WDM PON (Wavelength Division Multiplexing PON, the wavelength-division multiplex of access technology
Passive optical network) it is application scenarios, the principle of the present invention and embodiment are illustratively illustrated, as shown in Fig. 2, being existing
Have a kind of common structure of WDM PON, including OLT, ODN and ONU, wherein OLT include m optical transceiver TRx and close/point
Wave device, ODN include co-/demultiplexer, wherein m is the integer greater than 1.Co-/demultiplexer in WDM PON system, in ODN
Referred to as Wavelength division multiplexer/demultiplexer, it demultiplexes downlink signal, and distributes to specified ONU, while uplink signal is multiplexed
To an optical fiber, it is transferred to OLT.
Wherein, ODN is FTTH (Fiber To The Home, fiber entering household) fiber cable network based on PON equipment, is made
With being to provide transmission line between OLT and ONU, in the present embodiment, to ensure the reliability transmitted, between OLT and ODN
Trunk optical fiber include the spare trunk optical fiber of primary trunk optical fiber (being denoted as primary trunk optical fiber) and at least one (note
For spare trunk optical fiber).
To facilitate understanding of the present embodiment of the invention, the relevant technologies that can be introduced in description of the embodiment of the present invention are described below:
Front end passback:
With the evolution and development of wireless network, in order to further increase radio interface rate, improve making for user's mobile broadband
Increasingly reduced with the covering radius of experience, wireless base station, wireless base station is split into two parts: a part is known as RRU (Remote
Radio Unit, remote radio unit (RRU)), the main amplification and processing function for realizing radiofrequency signal is constantly close to user；Separately
A part is known as BBU (Base Band Unit, Base Band Unit), the functions such as main framing, management for realizing base band data, no
Central machine room is moved on on disconnected, forms base band resource pool.Wherein, connected between BBU and RRU by point-to-point optical fiber, the two it
Between the transmission of data be known as front end passback, refer to Fig. 3, specifically for a kind of common BBU-RRU networking structure.
Currently, WDM-PON is to carry the most competitive solution of front end return data, and when front end passback is to transmission
Prolong more demanding.As shown in figure 4, carrying a kind of common framework of front end return data for PON.Wherein, OLT and BBU resource pool
In a region, and OLT is connect at least one BBU；ONU and RRU in another region, each ONU and at least one
RRU connection.In equipment form, OLT and BBU resource pool can be independent two equipment, also be desirably integrated into an equipment
In；ONU and RRU can be independent two equipment, also be desirably integrated into an equipment.
Referring to Fig. 5, time-delay compensation device one embodiment of passive optical network includes being deployed in the embodiment of the present invention
First device of the side OLT and the second device for being deployed in the side ODN；Wherein, the first device includes detection light transmission unit and time delay
Processing unit, the second device include optical splitter 210 and reflection device 220.
Wherein, detection light transmission unit is used to send detection optical signal to primary trunk optical fiber or spare trunk optical fiber,
It may include mainly an optical transmitter module and a wavelength division multiplexer, wherein optical transmitter module is used for emission detection optical signal,
Herein, detection optical signal refers to the optical signal for testing optical network transmission quality (such as time delay), such as pulse or specific volume
The data of code, wavelength selection are not construed as limiting, such as the wavelength of detection optical signal can be 1310nm, or the wavelength of detection light is
Different from other wavelength of the wavelength of the business optical signal transmitted on optical-fiber network；Wherein, wavelength division multiplexer is used for light emitting mould
The detection optical signal of block transmitting injects primary trunk optical fiber or spare trunk optical fiber.
Such as in Fig. 5, detection light transmission unit includes the first optical transmitter module TX and the first wavelength division multiplexer 121,
In, the transmitting terminal of the first optical transmitter module TX is by the first wavelength division multiplexer 121 and primary trunk fiber couples, so as to primary
Trunk optical fiber sends detection optical signal.It is understood that in the present embodiment, being also possible to send to spare trunk optical fiber and visit
Light signal, at this point, the output end of detection light transmission unit and spare trunk fiber couples, for example, detection light transmission unit packet
Include the first optical transmitter module TX and the second wavelength division multiplexer 122 in Fig. 5.
Wherein, optical splitter 210 is used to the optical signal of input being divided into multichannel subsignal, in the present embodiment, optical splitter 210
It can be 1:2 optical splitter comprising a common end and two are for exporting the branch end of subsignal, wherein optical splitter 210
First branch end and primary trunk fiber couples, the second branch end and spare trunk fiber couples of optical splitter 210, optical splitter
210 common end is coupled with the first end of reflection device 220.It is understood that specific herein to the splitting ratio of optical splitter 210
It is not construed as limiting, such as optical splitter 210 can also be 1:3,1:4 or other splitting ratios, optionally, in actual application
In, splitting ratio can be according to the selection of the quantity of spare trunk optical fiber, for example, being divided when the quantity of spare trunk optical fiber is 2
Than that can be 1:3, i.e., the quantity of the branch end for exporting subsignal be the quantity of primary trunk optical fiber and spare trunk optical fiber
The sum of, so as to the corresponding branch end of each optical fiber.Optionally, in the present embodiment, 1:2 optical splitter can believe the light of input
It number is divided into two-way subsignal and exports, certainly, in some other embodiment, may not be and respectively handle, specifically herein
It is not construed as limiting.
Wherein, the first end of reflection device 220 is coupled with the common end of optical splitter 210, the second end of reflection device 220 with
The common end of ODN couples, and reflection device 220 is used to reflect the optical signal exported from optical splitter 210, and will be after reflection
Optical signal is exported to optical splitter 210.Optionally, in the present embodiment, reflection device 220 can be total reflection mirror.
As can be seen that after detection light transmission unit sends detection optical signal to primary trunk optical fiber or spare trunk optical fiber,
Detection optical signal transmits on corresponding optical fiber, and is incident to reflection device 220 via optical splitter 210, then by reflection device 220
It is reflected back the common end of optical splitter 210, and optical splitter 210 can be divided the reflected light signal that common end inputs, and obtain two-way
Reflected light signal is denoted as the first optical signal and the second optical signal, and the first branch end of the first optical signals optical splitter 210 is defeated
Out, the second branch end output of the second optical signals optical splitter 210, so far, can be in the two ways of optical signals that the side ODN obtains.
Wherein, time delay processing unit is used to obtain the first time information and acquisition second that the first optical signal reaches OLT
Optical signal reach OLT the second temporal information, and according to first time information and the second temporal information to OLT in primary trunk light
Data transmission on fine or spare trunk optical fiber carries out delay compensation.
In the present embodiment, the first optical signal transmits on primary trunk optical fiber, and the second optical signal is in spare trunk optical fiber
Upper transmission, and two ways of optical signals is fed simultaneously in the side ODN to corresponding optical fiber, two ways of optical signals reaches the time difference of OLT as a result,
The transmission time delay difference of as primary, spare trunk optical fiber, such time delay processing unit can according to transmission time delay difference to OLT in master
Delay compensation is carried out with the data transmission on trunk optical fiber or spare trunk optical fiber.Wherein, data transmission refers to bearer service number
According to business optical signal transmission.
In technical solution provided in an embodiment of the present invention, the embodiment of the present invention the side OLT be arranged detection light transmission unit and
Optical splitter and reflection device is arranged in the side ODN, wherein the detection optical signal that detection light transmission unit is sent in time delay processing unit
Transmitted in primary trunk optical fiber or spare trunk optical fiber, light-splitting processing carried out by optical splitter after reflection device reflects, so as to
The two ways of optical signals that the side ODN obtains, thereafter, two ways of optical signals are transmitted on primary trunk optical fiber and spare trunk optical fiber respectively,
And time delay processing unit obtains two ways of optical signals and arrives separately at the temporal information of OLT can obtain optical signal in primary optical fiber and standby
With the transmission time delay difference in optical fiber, and the number according to transmission time delay difference to OLT on primary trunk optical fiber or spare trunk optical fiber
Delay compensation is carried out according to transmission.Compared with prior art, the embodiment of the present invention can obtain optical signal in primary, spare trunk in real time
Transmission time delay difference in optical fiber compensates the propagation delay time of primary trunk optical fiber and spare trunk optical fiber, to meet front end passback pair
The propagation delay time requirement of PON.
Optionally, time delay processing unit is multiple including the first optical receiver module RX1, the second optical receiver module RX2, the first wavelength-division
With device 121, the second wavelength division multiplexer 122 and processing module 123；Wherein, the first optical receiver module RX1 is multiple by the first wavelength-division
With device 121 and primary trunk fiber couples, the second optical receiver module RX2 passes through the second wavelength division multiplexer 122 and spare trunk light
Fibre coupling.In this way, the first time information that the first optical signal reaches OLT is just that the first optical receiver module RX1 receives the first light letter
Number time, obtain first time information, the second temporal information that the second optical signal reaches OLT is just the second optical receiver module
RX2 receives the time of the second optical signal, obtains the second temporal information.
Wherein, processing module 123 are believed for obtaining first time information and the second temporal information, and according to first time
Breath and the second temporal information carry out time delay benefit to data transmission of the OLT on primary trunk optical fiber or spare trunk optical fiber
It repays.It is appreciated that the input terminal of processing module 123 is used for receiving front-end return data, processing module 123 in down direction
Output end is coupled with the input terminal of the m optical transceiver TRx of OLT, so that the front end return data to downlink is in primary trunk light
Transmission on fine or spare trunk optical fiber carries out delay compensation.In up direction, the input terminal of processing module 123 and the m of OLT are a
The output end of optical transceiver TRx couples, and for receiving the front end return data from RRU, the output end of processing module 123 is used for
Front end return data is sent to BBU, so that the front end return data to uplink is on primary trunk optical fiber or spare trunk optical fiber
Transmission carry out delay compensation.
For example, in the present embodiment, the time that the first optical receiver module RX1 receives the first optical signal is T1, and the second light connects
It receives module RX2 and receives the time of the second optical signal as T2, then the difference between T1 and T2 is just the transmission of primary, spare trunk optical fiber
Delay inequality.Certainly, in certain embodiments, the time that optical signal is reflected by reflection device 220 can also be recorded, is denoted as T0, then
Δ T1=T1-T0 indicates the propagation delay time of primary trunk optical fiber, Δ T2=T2-T0, when indicating the transmission of spare trunk optical fiber
Prolong, the transmission time delay difference of primary, spare trunk optical fiber is calculated according further to Δ T1 and Δ T2.
Optionally, as shown in fig. 6, in the present embodiment, processing module 123 may include computational submodule 1231, first
Handle submodule 1232 and second processing submodule 1232, wherein computational submodule 1231 is used for the first time according to acquisition
Information and the second temporal information calculation delay offset, wherein delay compensation value is the propagation delay time of primary, spare trunk optical fiber
Difference；First processing submodule 1232 is used to transmit data of the OLT on primary trunk optical fiber according to the delay compensation value and carry out
Delay compensation；Second processing submodule 1233 is used to transmit data of the OLT on spare trunk optical fiber according to delay compensation value
Carry out delay compensation.
It is understood that in the present embodiment, detecting the wavelength division multiplexer for including in light transmission unit and time delay processing
The wavelength division multiplexer for including in unit can be same, as in Fig. 5 the first wavelength division multiplexer 121 or the second wavelength-division it is multiple
With device 122, or different, as detection one wavelength division multiplexer of light transmission unit separate configurations, no longer and at time delay
Manage units shared.
It is understood that in the present embodiment, in detection light transmission unit and one wavelength-division of time delay processing units shared
In the case where multiplexer, detect light transmission unit in include optical transmitter module can also with include in time delay processing unit its
In optical receiver module combine, for example, being substituted by an optical transceiver, as such, it will be understood that being wrapped in detection light transmission unit
The optical transmitter module contained can also may or may not be physics with the optical receiver module for including in time delay processing unit
It is upper separated.For example, the first optical transmitter module TX and the first optical receiver module RX1 can be an integrated light transmitting-receiving in Fig. 5
Machine.
The time-delay compensation device of the passive optical network in the embodiment of the present invention is described above, below to the present invention
The delay compensation method of passive optical network in embodiment is described, referring to Fig. 7, passive optical network in the embodiment of the present invention
Delay compensation method one embodiment include:
It is understood that the process of the present embodiment can be applied to the delay compensation dress of passive optical network shown in fig. 5
It sets.
701, OLT sends detection optical signal to primary trunk optical fiber or spare trunk optical fiber；
It should be noted that in the present embodiment, detection optical signal is uploaded in primary trunk optical fiber or spare trunk optical fiber
It is defeated, light-splitting processing is carried out by the optical splitter in ODN after the reflection device reflection in ODN, obtains uploading in primary trunk optical fiber
The first optical signal sent and the second optical signal transmitted on spare trunk optical fiber lead to as a result, on the basis of detecting optical signal
The reflection device and optical splitter for crossing the side ODN can be in the two ways of optical signals that the side ODN obtains.
One of realization structure of the two ways of optical signals obtained based on detection optical signal in the side ODN is carried out below detailed
Description: in the present embodiment, the side ODN is deployed with optical splitter and reflection device, and in the present embodiment, optical splitter can be 1:2 points
Light device a comprising common end and two are for exporting the branch end of subsignal, wherein the first branch end of optical splitter and master
With trunk fiber couples, the second branch end and spare trunk fiber couples, the common end of optical splitter and reflection device of optical splitter
First end coupling.In the present embodiment, the first end of reflection device is coupled with the common end of optical splitter, and the second of reflection device
End is coupled with the common end of ODN, and reflection device is believed for reflecting from optical splitter output optical signal, and by the light after reflection
Number output is to optical splitter.The time delay that specifically explanation herein in regard to optical splitter and reflection device can refer to above-mentioned passive optical network is mended
The description in device is repaid, details are not described herein again.It is understood that in actual application, it can also be using other realizations
Structure realizes the optical signal transmitted on primary, spare trunk optical fiber respectively in the two-way that the side ODN obtains.
702, OLT obtains the first optical signal and reaches the first time information of OLT and obtain the second optical signal arrival OLT's
Second temporal information；
In the present embodiment, the first optical signal transmits on primary trunk optical fiber, and the second optical signal is in spare trunk optical fiber
Upper transmission, and two ways of optical signals is fed simultaneously in the side ODN to corresponding optical fiber, two ways of optical signals reaches the time difference of OLT as a result,
It can reflect the transmission time delay difference of primary, spare trunk optical fiber.
It is described below to how OLT obtains first time information:
OLT receives the first optical signal by the first optical receiver module in OLT；
OLT obtains the time that the first optical receiver module receives first optical signal, obtains first time information.
Equally, the second temporal information of OLT acquisition may include:
OLT receives the second optical signal by the second optical receiver module；
OLT obtains the time that the second optical receiver module receives the second optical signal, obtains the second temporal information.
The first optical signal specifically is received herein in regard to OLT, the realization structure of the second optical signal can refer to above-mentioned passive light
Description in the time-delay compensation device of network, details are not described herein again.
703, OLT according to first time information and the second temporal information to OLT in primary trunk optical fiber or spare trunk light
Data transmission on fibre carries out delay compensation；
In the present embodiment, it is primary, spare trunk optical fiber that the first optical signal, the second optical signal, which reach the time difference of OLT,
Transmission time delay difference, as a result, OLT can according to first time information and the second temporal information to OLT in primary trunk optical fiber or
Data transmission on spare trunk optical fiber carries out delay compensation.
It can specifically include:
OLT is according to first time information and the second temporal information calculation delay offset；
OLT according to delay compensation value to OLT on primary trunk optical fiber or spare trunk optical fiber data transmit carry out when
Prolong compensation.
In technical solution provided in an embodiment of the present invention, OLT is sent to primary trunk optical fiber or spare trunk optical fiber first
Detecting optical signal, wherein detection optical signal carries out light-splitting processing by the optical splitter in ODN after the reflection device reflection in ODN,
So as to the two ways of optical signals obtained in the side ODN, and two ways of optical signals is uploaded in primary trunk optical fiber and spare trunk optical fiber respectively
It is defeated；OLT obtains the temporal information that two ways of optical signals arrives separately at OLT again, can be obtained by this way optical signal in primary optical fiber and
Transmission time delay difference in spare fibre, last OLT is further according to transmission time delay difference to OLT in primary trunk optical fiber or spare trunk light
Data transmission on fibre carries out delay compensation.Compared with prior art, the embodiment of the present invention can obtain in real time optical signal master,
Transmission time delay difference in spare trunk optical fiber compensates the propagation delay time of primary trunk optical fiber and spare trunk optical fiber, before meeting
Propagation delay time requirement of the end passback to PON.
The time-delay compensation device and method of the passive optical network in the embodiment of the present invention are described above, below it is right
Passive optical network in the embodiment of the present invention is described:
In the present embodiment, passive optical network may include at least one any one passive light as described in above-described embodiment
The time-delay compensation device of network.
It should be noted that in the above-described embodiments, all emphasizing particularly on different fields to the description of each embodiment, in some embodiment
The part not being described in detail, reference can be made to the related descriptions of other embodiments.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of time-delay compensation device of passive optical network, the passive optical network includes optical line terminal OLT, Optical Distribution Network
The primary trunk optical fiber and spare trunk optical fiber of ODN and the connection OLT and the ODN, which is characterized in that the time delay
Compensation device includes the first device for being deployed in the side OLT and the second device for being deployed in the side ODN；
First device includes detection light transmission unit, and the detection light transmission unit is for primary trunk optical fiber or spare
Trunk optical fiber sends detection optical signal；
Second device includes optical splitter and reflection device；Wherein, the first branch end of the optical splitter and the primary master
The common end of dry fiber coupling, the second branch end of the optical splitter and the spare trunk fiber couples, the optical splitter is logical
The reflection device is crossed to couple with the common end of the ODN；
First device further includes time delay processing unit, and the time delay processing unit is for obtaining described in the arrival of the first optical signal
The first time information of OLT and the second temporal information that the second optical signal reaches the OLT is obtained, and when according to described first
Between information and the second temporal information calculation delay offset, according to the delay compensation value to the OLT in the primary trunk
Data transmission on optical fiber or the spare trunk optical fiber carries out delay compensation；Wherein, first optical signal is the detection
The optical signal that light is exported after reflection device reflection by the first branch end of the optical splitter, second optical signal is institute
State the optical signal that detection light is exported after reflection device reflection by the second branch end of the optical splitter.
2. the time-delay compensation device of passive optical network as described in claim 1, it is characterised in that:
The time delay processing unit includes the first optical receiver module, the second optical receiver module, the first wavelength division multiplexer, the second wavelength-division
Multiplexer and processing module；Wherein,
First optical receiver module passes through first wavelength division multiplexer and the primary trunk fiber couples, second light
Receiving module passes through second wavelength division multiplexer and the spare trunk fiber couples；
The processing module obtains described for obtaining the time that first optical receiver module receives first optical signal
One temporal information, and the time that second optical receiver module receives second optical signal is obtained, when obtaining described second
Between information, and according to the first time information and the second temporal information to the OLT in the primary trunk optical fiber or described
Data transmission on spare trunk optical fiber carries out delay compensation.
3. the time-delay compensation device of passive optical network as claimed in claim 2, it is characterised in that:
The detection light emitting unit includes the first optical transmitter module for emission detection optical signal；Wherein, first light
Transmitting module is coupled with first wavelength division multiplexer or second wavelength division multiplexer.
4. the time-delay compensation device of passive optical network as claimed in claim 1 or 2, it is characterised in that:
The detection light emitting unit includes third wavelength division multiplexer and the first light emitting mould for emission detection optical signal
Block；Wherein, first optical transmitter module passes through the third wavelength division multiplexer and the primary trunk optical fiber or spare trunk
Fiber coupling.
5. the time-delay compensation device of the passive optical network as described in any one of claims 1 to 3, it is characterised in that:
The processing module includes computational submodule, the first processing submodule and second processing submodule；Wherein,
The computational submodule is used to be mended according to the first time information of acquisition and the second temporal information calculation delay
Repay value；
The first processing submodule is for the number according to the delay compensation value to the OLT on the primary trunk optical fiber
Delay compensation is carried out according to transmission；
The second processing submodule is for the number according to the delay compensation value to the OLT on the spare trunk optical fiber
Delay compensation is carried out according to transmission.
6. a kind of delay compensation method of passive optical network, the passive optical network includes optical line terminal OLT, Optical Distribution Network
The primary trunk optical fiber and spare trunk optical fiber of ODN and the connection OLT and the ODN, which is characterized in that
The OLT sends detection optical signal to the primary trunk optical fiber or spare trunk optical fiber；Wherein, the detection optical signal
Light-splitting processing is carried out by the optical splitter in the ODN after the reflection device reflection in the ODN, is obtained in the primary trunk
The first optical signal transmitted on optical fiber and the second optical signal transmitted on the spare trunk optical fiber；
The OLT obtains first optical signal and reaches the first time information of the OLT and obtain second optical signal
Reach the second temporal information of the OLT；
The OLT is according to the first time information and the second temporal information calculation delay offset；
The OLT according to the delay compensation value to the OLT on the primary trunk optical fiber or the spare trunk optical fiber
Data transmission carry out delay compensation.
7. the delay compensation method of passive optical network as claimed in claim 6, which is characterized in that the OLT includes the first light
Receiving module, the second optical receiver module, the first wavelength division multiplexer and the second wavelength division multiplexer, wherein first light-receiving
For module by first wavelength division multiplexer and the primary trunk fiber couples, second optical receiver module passes through described the
Two wavelength division multiplexers and the spare trunk fiber couples；
Then the OLT, which obtains first optical signal and reaches the first time information of the OLT, includes:
The OLT receives first optical signal by first optical receiver module；
The OLT obtains the time that first optical receiver module receives first optical signal, obtains the first time letter
Breath；
The OLT, which obtains second optical signal and reaches the second temporal information of the OLT, includes:
The OLT receives second optical signal by second optical receiver module；
The OLT obtains the time that second optical receiver module receives second optical signal, obtains the second time letter
Breath.
8. a kind of passive optical network, it is characterised in that: the passive optical network includes such as any one of claim 1 to 5 institute
The time-delay compensation device for the passive optical network stated.
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| CN201510590584.7A CN106550288B (en) | 2015-09-16 | 2015-09-16 | A kind of time-delay compensation device of passive optical network, method and passive optical network |
| PCT/CN2016/084470 WO2017045440A1 (en) | 2015-09-16 | 2016-06-02 | Delay compensation apparatus and method of passive optical network, and passive optical network |
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| CN201510590584.7A CN106550288B (en) | 2015-09-16 | 2015-09-16 | A kind of time-delay compensation device of passive optical network, method and passive optical network |
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| CN108809617B (en) * | 2018-04-18 | 2021-12-14 | 京信网络系统股份有限公司 | Time delay compensation method and terminal |
| CN110601749A (en) * | 2019-11-04 | 2019-12-20 | 国网新疆电力有限公司信息通信公司 | Optical fiber communication control system |
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| WO2013167026A2 (en) * | 2012-11-23 | 2013-11-14 | 中兴通讯股份有限公司 | Time synchronization apparatus and method for automatically detecting the asymmetry of an optical fiber |
| CN104426625A (en) * | 2013-08-29 | 2015-03-18 | 中国移动通信集团公司 | Method, device, and system for ranging of passive optical network standby optical fiber link |
| CN104753584A (en) * | 2015-04-03 | 2015-07-01 | 烽火通信科技股份有限公司 | PON (passive optical network) backbone optical link protection system and quick switching method thereof |
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| CN102064901B (en) * | 2010-12-29 | 2013-10-02 | 烽火通信科技股份有限公司 | Method for compensating asymmetric line delay caused by OLP (Optical Line Protection) switching |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013167026A2 (en) * | 2012-11-23 | 2013-11-14 | 中兴通讯股份有限公司 | Time synchronization apparatus and method for automatically detecting the asymmetry of an optical fiber |
| CN104426625A (en) * | 2013-08-29 | 2015-03-18 | 中国移动通信集团公司 | Method, device, and system for ranging of passive optical network standby optical fiber link |
| CN104753584A (en) * | 2015-04-03 | 2015-07-01 | 烽火通信科技股份有限公司 | PON (passive optical network) backbone optical link protection system and quick switching method thereof |
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