CN110061798A - WDM optical transmission equipment, system and implementation method - Google Patents
WDM optical transmission equipment, system and implementation method Download PDFInfo
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- CN110061798A CN110061798A CN201810052254.6A CN201810052254A CN110061798A CN 110061798 A CN110061798 A CN 110061798A CN 201810052254 A CN201810052254 A CN 201810052254A CN 110061798 A CN110061798 A CN 110061798A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/03—WDM arrangements
- H04J14/0305—WDM arrangements in end terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
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Abstract
This application discloses a kind of WDM optical transmission equipment, system and implementation methods, wherein, WDM optical transmission equipment, include: transmitting Multiplexing module, receive demultiplexing module and spectral module, the transmitting Multiplexing module is used to carry out the incident light of multichannel different wave length wavelength-division multiplex and polarization conversion, and the first direction polarised light of output wavelength-division multiplex all the way is to the spectral module；The spectral module by fibre circuit for being exported the first direction polarised light of the wavelength-division multiplex all the way to opposite end, and, the second direction polarised light of the wavelength-division multiplex all the way from the opposite end is received by same fibre circuit, and the second direction of the wavelength-division multiplex all the way is polarized into light output to the reception demultiplexing module；The second direction polarised light for receiving the wavelength-division multiplex all the way that demultiplexing module is used to receive demultiplexes, the emergent light of output multi-channel different wave length.The embodiment of the present invention realizes the transmission of high bandwidth single fiber bi-directional by polarization multiplexing.
Description
Technical field
The present invention relates to field of communication technology, espespecially a kind of WDM optical transmission equipment, system and implementation method.
Background technique
With the development of the times, the requirement of information and data transmission to network bandwidth is higher and higher, wireless telecommunications, more matchmakers
The all trades and professions such as body, wire transmission, data acquisition, monitoring security protection are intended to carry out signal transmission using optical fiber, in order to promote net
Network bandwidth, number of fibers are continuously increased.However the laying of these long optical fibers, maintenance, management need to expend a large amount of manpower and object
Power, so the usage quantity for reducing optical fiber can effectively reduce the cost of data transmission.
The means of the common usage quantity for reducing optical fiber are wavelength-division multiplex, i.e. the transmitter of proximal end swashing using different wave length
The light carrier for carrying different information is synthesized all the way using wavelength division multiplexer, is transmitted to distal end, distal end via an optical fiber by light device
The optical signal of the different wave length in the optical fiber is separated using solution wavelength division multiplexer, is received by each corresponding receiving end.Distally
Proximally transmitting signal uses identical method.
Fiber optic network in use of wavelength division multiplexing meets the demand for reducing number of fibers to a certain extent, main special
Sign is: transmitting terminal and receiving end pass through an a pair/optical fiber and transmit multiple signals simultaneously.But this method still has
: for system is using a pair of of optical fiber, there is the deficiency that cannot achieve single fiber bi-directional communication in problem, and two optical fiber are unable to satisfy
The requirement of certain fields reduction number of fibers.
Summary of the invention
The embodiment of the invention provides a kind of WDM optical transmission equipment, system and implementation methods, to realize that single fiber is double
To transmission.
The embodiment of the invention provides a kind of WDM optical transmission equipment, comprising: transmitting Multiplexing module and reception demultiplex
With module, and the spectral module being connected respectively with the transmitting Multiplexing module and the reception demultiplexing module, in which:
The transmitting Multiplexing module is used to carrying out the incident light of multichannel different wave length into wavelength-division multiplex and polarization conversion, output
The first direction polarised light of wavelength-division multiplex is to the spectral module all the way；
The spectral module be used for by the first direction polarised light of the wavelength-division multiplex all the way by fibre circuit export to
Opposite end, and, the second direction polarised light of the wavelength-division multiplex all the way from the opposite end is received by same fibre circuit, and will
The second direction of the wavelength-division multiplex all the way polarizes light output to the reception demultiplexing module；
The second direction polarised light for receiving the wavelength-division multiplex all the way that demultiplexing module is used to receive carries out
Demultiplexing, the emergent light of output multi-channel different wave length；
Wherein, the first direction is different from second direction.
The embodiment of the invention also provides a kind of Wave division multiplexing optical transmission systems, comprising: the first WDM optical transmission is set
Standby and the second WDM optical transmission equipment, the first WDM optical transmission equipment and the second WDM optical transmission equipment
It is connected by fibre circuit all the way；
The first WDM optical transmission equipment is used to the first incident light of multichannel different wave length carrying out wavelength-division multiplex
And polarization conversion, the first direction polarised light of output wavelength-division multiplex all the way is to the second WDM optical transmission equipment；And
The second direction for receiving the wavelength-division multiplex all the way that the second WDM optical transmission equipment is exported by the fibre circuit is inclined
Shake light, is demultiplexed, the first emergent light of output multi-channel different wave length；
The second WDM optical transmission equipment is used to receive the one of the first WDM optical transmission equipment output
The first direction polarised light of road wavelength-division multiplex, is demultiplexed, the second emergent light of output multi-channel different wave length；And it will be more
Second incident light of road different wave length carries out wavelength-division multiplex and polarization conversion, exports the second direction polarised light of wavelength-division multiplex all the way
To the first WDM optical transmission equipment；
Wherein, the first direction is different from second direction.
The embodiment of the invention also provides a kind of implementation methods of WDM optical transmission, comprising:
The incident light of multichannel different wave length is subjected to wavelength-division multiplex and polarization conversion obtains the first party of wavelength-division multiplex all the way
To polarised light, will be exported by fibre circuit to opposite end described in the first direction polarised light of the wavelength-division multiplex all the way；And
The second direction polarised light of the wavelength-division multiplex all the way from the opposite end is received by same fibre circuit, it will be described
The second direction polarised light of wavelength-division multiplex is demultiplexed all the way, the emergent light of output multi-channel different wave length；
Wherein, the first direction is different from second direction.
The embodiment of the present invention makes the light for receiving and dispatching both direction on the basis of wavelength-division multiplex technique, through polarization multiplexing
Signal uses different polarization states, realizes the separation of single fiber bi-directional transmission optical signal, number of fibers is reduced to 1 by 2.It is logical
The embodiment of the present invention is crossed, the number of fibers of network can be reduced to greatest extent, and single fiber bi-directional transmission high speed may be implemented
The demand of rate (for example, 100Gbps is even higher) optical signal, or even realize the carrying of more high bandwidth single fiber bi-directional transmission.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
Attached drawing is used to provide to further understand technical solution of the present invention, and constitutes part of specification, with this
The embodiment of application technical solution for explaining the present invention together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is the composition schematic diagram of the WDM optical transmission equipment of the embodiment of the present invention；
Fig. 2 is the composition schematic diagram of the transmitting Multiplexing module of the embodiment of the present invention；
Fig. 3 is the composition schematic diagram of the reception demultiplexing module of the embodiment of the present invention；
Fig. 4 is the composition schematic diagram of the WDM optical transmission equipment of another embodiment of the present invention；
Fig. 5 is the flow chart (direction of the launch) of the implementation method of the WDM optical transmission of the embodiment of the present invention；
Fig. 6 is the flow chart (receiving direction) of the implementation method of the WDM optical transmission of the embodiment of the present invention；
Fig. 7 is the composition schematic diagram of the Wave division multiplexing optical transmission system of the embodiment of the present invention；
Fig. 8 is the refinement composition schematic diagram of Fig. 7 Wave division multiplexing optical transmission system；
Fig. 9 is that the proximal end wavelength division multiplexer group of the embodiment of the present invention and proximal end are polarized/analyzer group connection schematic diagram；
Figure 10 is the proximal end optical splitter of the embodiment of the present invention and the connection schematic diagram of distal end optical splitter；
Figure 11 is that the distal end wavelength division multiplexer group of the embodiment of the present invention and distal end are polarized/analyzer group connection schematic diagram；
Figure 12 and Figure 13 is that the Wave division multiplexing optical transmission system of the embodiment of the present invention realizes the signal of WDM optical transmission
Figure；
Figure 14 is the composition schematic diagram of the Wave division multiplexing optical transmission system of another embodiment of the present invention；
Figure 15 is one application scenarios schematic diagram of Wave division multiplexing optical transmission system of the embodiment of the present invention；
Figure 16 is the Wave division multiplexing optical transmission system another application schematic diagram of a scenario of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
In use of wavelength division multiplexing, if system uses an optical fiber, optical signal transceiver both direction can only be used not
Same wavelength, wastes the wavelength resource of half, while also reducing the bandwidth of single fiber bearer network.
Wavelength-division multiplex technique is used alone, is not enough to realize that optical fiber saves maximized demand, is also unable to satisfy individual necks
The function of domain single fiber bi-directional transmission high bandwidth (such as 100Gbps is even higher) signal.Wavelength-division multiplex add the scheme of circulator from
Theoretically realize single fiber bi-directional transmission 100Gbps optical signal function, i.e., the transmitter of proximal end use different wave length laser
The light carrier for carrying different information is synthesized all the way using wavelength division multiplexer, enters optical fiber via circulator, pass to distal end by device；
The multiplex optical signal that distal end is passed back is separated via circulator with near-end transmitted signal, and the solution wavelength division multiplexer into proximal end is divided
Wave finally arrives at receiving end.But since the long optical fibers in scheme often undergo multiple termination, proximal end/distal end transmitting light letter
Number reflection can be generated, these reflected light signals can be directly entered respective receiving end by circulator, cause larger interference, cause
It can not be applied in practical networking.
The embodiment of the present invention, can be real on the basis of wavelength-division multiplex by way of wavelength-division multiplex and palarization multiplexing combination
Existing single fiber bi-directional transmits high-speed (for example, 100Gbps is even higher) optical signal.
As shown in Figure 1, the WDM optical transmission equipment of the embodiment of the present invention, including transmitting Multiplexing module 11 and reception solution
Multiplexing module 12, and the spectral module being connected respectively with the transmitting Multiplexing module 11 and the reception demultiplexing module 12
13, in which:
The transmitting Multiplexing module 11 is used to the incident light of multichannel different wave length carrying out wavelength-division multiplex and polarization conversion, defeated
Out all the way the first direction polarised light of wavelength-division multiplex to spectral module 13；
The spectral module 13 is used to export the first direction polarised light of the wavelength-division multiplex all the way by fibre circuit
To opposite end, and, the second direction polarised light of the wavelength-division multiplex all the way from the opposite end is received by same fibre circuit, and
It exports to the reception demultiplexing module 12；
It is described receive the second direction polarised light of the wavelength-division multiplex all the way that demultiplexing module 12 is used to receive into
Row demultiplexing, the emergent light of output multi-channel different wave length；
Wherein, the first direction is different from second direction.
The embodiment of the present invention makes the light for receiving and dispatching both direction on the basis of wavelength-division multiplex technique, through polarization multiplexing
Signal uses different polarization states, realizes the separation of single fiber bi-directional transmission optical signal, number of fibers is reduced to 1 by 2.
Wherein, the wavelength-division multiplex can be CWDM (Coarse Wavelength Division Multiplexing,
Coarse wavelength division multiplexer), being also possible to DWDM, (Dense Wavelength Division Multiplexing, dense wavelength division are multiple
With).
Wherein, the opposite end is similarly WDM optical transmission equipment, and what is exported is the second party of wavelength-division multiplex all the way
To polarised light, input be wavelength-division multiplex all the way first direction polarised light.
Wherein, first direction polarised light refers to that the polarised light of first direction polarization, second direction polarised light refer to second party
To the polarised light of polarization.
The polarised light can be linearly polarized light.
In order to avoid first direction polarised light and second direction polarised light interfere with each other, the settable first direction and
Two directions are mutually perpendicular to.But the application is without being limited thereto, and in other embodiments, the first direction and second direction can not also
It is mutually perpendicular to, the first direction is different from second direction.
The spectral module 13 can be optical splitter or photo-coupler, be also possible to other light-splitting devices.
Wherein, the spectral module 13 receives the second direction polarised light of the wavelength-division multiplex all the way from the opposite end, will
The second direction polarised light of the wavelength-division multiplex all the way is divided into two beams, is respectively sent to receive demultiplexing module 12 and transmitting multiplexing
Module 11.
The transmitting Multiplexing module 11 does not need the second direction polarised light that the spectral module 13 returns, then will be described point
The second direction polarised light of optical module input is isolated, moreover, inclined by second direction of the isolation from the opposite end
Shake light, avoids interference of the second direction polarised light to incident light.
In one embodiment, the spectral module 13 be Y type optical splitter, the Y type optical splitter refer to one it is defeated
Enter end, the optical splitter of two output ends, since optical path is reciprocal, so it is also assumed that being two input terminals, an output end.
The beam splitting capabilities ratio of the Y type optical splitter is 1:H, and the H is more than or equal to 1, wherein the light splitting function of the Y type optical splitter
One end that rate corresponds to 1 than in connects the transmitting Multiplexing module, corresponds to H in the beam splitting capabilities ratio of the Y type optical splitter
One end connect the reception demultiplexing module.
As shown in Fig. 2, in one embodiment, the transmitting Multiplexing module 11 includes connected 111 He of wavelength division multiplexer
The polarizer 112, in which:
The wavelength division multiplexer 111 is used to carrying out the incident light of multichannel different wave length into wavelength-division multiplex to export wavelength-division all the way and answer
Incident light is to the polarizer 112；
The polarizer 112 is used to the incident light of the wavelength-division multiplex all the way carrying out polarization conversion, exports wavelength-division all the way
The first direction polarised light of multiplexing is to spectral module 13；And the second direction polarised light received is isolated.
Wherein, the polarization conversion, which can refer to, is converted to polarised light for non-polarized light, may also mean that a direction
Polarised light is converted to the polarised light of other direction.
It in another embodiment, can be by the location swap of wavelength division multiplexer 111 and the polarizer 112, the polarizer
For the incident light of multichannel different wave length to be carried out polarization conversion, output multi-channel first direction polarised light to the wavelength-division multiplex
Device；And the second direction polarised light of the multichannel different wave length received is isolated；
The wavelength division multiplexer is used to carrying out multichannel first direction polarised light into wavelength-division multiplex output wavelength-division multiplex all the way
First direction polarised light is to spectral module；And demultiplex the second direction polarised light for receiving wavelength-division multiplex all the way,
The second direction polarised light of output multi-channel different wave length is to the polarizer.
The wavelength division multiplexer 111 can use OMU (Optical Multiplex Unit, optical multiplex unit, i.e. multiplex
Device).
In one embodiment, the reception demultiplexing module includes solution wavelength division multiplexer, in which:
The solution wavelength division multiplexer is exported for demultiplexing the second direction polarised light of the wavelength-division multiplex all the way
The emergent light of multichannel different wave length.
Due to receive demultiplexing module may receive reflected first direction polarised light, in order to be isolated this first
Direction polarised light, as shown in figure 3, in one embodiment, the reception demultiplexing module 12 includes solution 121 He of wavelength division multiplexer
Analyzer 122, wherein the spectral module 13, analyzer 122 are conciliate wavelength division multiplexer 121 and be sequentially connected, alternatively, described point
Optical module 13, solution wavelength division multiplexer 121 and analyzer 122 are sequentially connected；
Second direction polarised light of the solution wavelength division multiplexer 121 for the wavelength-division multiplex all the way is demultiplexed, defeated
The emergent light of multichannel different wave length out；For the analyzer 122 for only passing through second direction polarised light, shielding first direction is inclined
Shake light.
The solution wavelength division multiplexer 121 can use ODU (Optical De-Multiplex Unit, Optical Demultiplexing list
Member, i.e. channel-splitting filter).
Polarizing film, Nicol prism etc. can be used in the above-mentioned polarizer 112 and analyzer 122.
In the first direction and the not orthogonal scheme of second direction, the polarizer 112, analyzer 122 be can be used
The polarizer group of more than one different directions synthesizes composite polarizing plate group, and realization is transmitted two-way different inclined on fibre circuit all the way
The optical signal in vibration direction.But the application is without being limited thereto, and first direction and second direction not phase can also be realized using other modes
Mutually vertical scheme.
As shown in figure 4, in one embodiment, the WDM optical transmission equipment further include: the first conversion module 14
With the second conversion module 15, in which:
First conversion module 14 is connected with the transmitting Multiplexing module 11, for being converted to multichannel input electrical signal
The incident light of the multichannel different wave length；
Second conversion module 15 is connected with the reception demultiplexing module 12, for by the multichannel different wave length
Emergent light is converted to multiple-channel output electric signal.
Wherein, first conversion module 14 is alternatively referred to as optical transmitting set or abbreviation transmitter, can use OTU
(Optical Transform Unit, optical conversion element) is realized, wherein light letter can be converted electrical signals to by laser
Number.Second conversion module 15 is alternatively referred to as optical receiver or abbreviation receiver, can be realized using OTU, wherein can adopt
Electric signal is converted optical signals to photodiode.
The implementation method of the WDM optical transmission of the embodiment of the present invention is applied to WDM optical transmission equipment, for
The direction of the launch, as shown in Figure 5, comprising:
Step 501, the incident light of multichannel different wave length is subjected to wavelength-division multiplex and polarization conversion obtains wavelength-division multiplex all the way
First direction polarised light；
Step 502, it will be exported by fibre circuit to opposite end described in the first direction polarised light of the wavelength-division multiplex all the way.
For receiving direction, as shown in Figure 6, comprising:
Step 601, it is polarized by the second direction that same fibre circuit receives the wavelength-division multiplex all the way from the opposite end
Light；
Step 602, the second direction polarised light of the wavelength-division multiplex all the way is demultiplexed, output multi-channel different wave length
Emergent light.
Wherein, the first direction is different from second direction.
The embodiment of the present invention makes the light for receiving and dispatching both direction on the basis of wavelength-division multiplex technique, through polarization multiplexing
Signal uses different polarization states, realizes the separation of single fiber bi-directional transmission optical signal, number of fibers is reduced to 1 by 2.
Different with the position of the polarizer according to wavelength division multiplexer, the incident light by multichannel different wave length carries out wavelength-division and answers
With the first direction polarised light for obtaining wavelength-division multiplex all the way with polarization conversion, comprising:
The incident light of multichannel different wave length is subjected to wavelength-division multiplex, obtains the incident light of wavelength-division multiplex all the way；By described one
The incident light of road wavelength-division multiplex carries out polarization conversion and obtains the first direction polarised light of wavelength-division multiplex all the way；Or
The incident light of multichannel different wave length is subjected to polarization conversion, obtains multichannel first direction polarised light；By the multichannel
First direction polarised light carries out wavelength-division multiplex and obtains the first direction polarised light of wavelength-division multiplex all the way.
The Wave division multiplexing optical transmission system of the embodiment of the present invention includes that the wavelength division multiplexed light of two mutually transmission optical signals passes
Transfer device, as shown in fig. 7, Wave division multiplexing optical transmission system includes: that the first WDM optical transmission equipment 71 and the second wavelength-division are multiple
With optical transmission device 72, the first WDM optical transmission equipment 71 and the second WDM optical transmission equipment 72 are by all the way
Fibre circuit 73 is connected；
The first WDM optical transmission equipment 71 is used to the first incident light of multichannel different wave length carrying out wavelength-division to answer
With and polarization conversion, the first direction polarised light of output wavelength-division multiplex all the way is to the second WDM optical transmission equipment 72；
And receive the of the wavelength-division multiplex all the way that the second WDM optical transmission equipment 72 is exported by the fibre circuit 73
Two direction polarised lights, are demultiplexed, the first emergent light of output multi-channel different wave length；
The second WDM optical transmission equipment 72 is exported for receiving the first WDM optical transmission equipment 71
Wavelength-division multiplex all the way first direction polarised light, demultiplexed, the second emergent light of output multi-channel different wave length；And
Second incident light of multichannel different wave length is subjected to wavelength-division multiplex and polarization conversion, the second direction for exporting wavelength-division multiplex all the way is inclined
Light shake to the first WDM optical transmission equipment 71；
Wherein, the first direction is different from second direction.
The embodiment of the present invention makes the light for receiving and dispatching both direction on the basis of wavelength-division multiplex technique, through polarization multiplexing
Signal uses different polarization states, realizes the separation of single fiber bi-directional transmission optical signal, number of fibers is reduced to 1 by 2.
It should be noted that the first WDM optical transmission equipment 71 and the second WDM optical transmission equipment 72 are logical
It crosses fibre circuit 73 all the way to be connected, refers to that optical fiber can be with transmitted in both directions optical signal all the way, which includes but unlimited
The shape of optical fiber all the way is realized for example, the fibre circuit 73 can also be connected with each other using multifiber in a root long optical fiber
Formula, and, in order to increase the distance of lightray propagation, it is also provided with trunking in the fibre circuit 73, in addition, being
Raising Output optical power is also provided with optical amplification device such as OA (optical in the fibre circuit 73
Amplifier, image intensifer), and, for road above and below optical signal, it is also provided with OADM (Optical Add-Drop
Multiplexer, optical add/drop multiplexer) etc. optical devices, the application without limitation, transmitted in both directions is realized on fibre circuit all the way
Optical signal.
The structure of above-mentioned first WDM optical transmission equipment and the second WDM optical transmission equipment is as previously described.
In one embodiment, the first WDM optical transmission equipment 71 includes: the first transmitting Multiplexing module and
One receives demultiplexing module, and be connected respectively with the first transmitting Multiplexing module and the first reception demultiplexing module
First spectral module, in which:
The first transmitting Multiplexing module is used to the first incident light of multichannel different wave length carrying out wavelength-division multiplex and polarization
Conversion, the first direction polarised light of output wavelength-division multiplex all the way is to the first spectral module；
First spectral module is used to the first direction polarised light of the wavelength-division multiplex all the way passing through the optical fiber cable
Road is exported to the second WDM optical transmission equipment, and, second wavelength-division multiplex is received by same fibre circuit
The second direction polarised light of the wavelength-division multiplex all the way of optical transmission device output, and export to described first and receive demultiplexing module；
The second direction polarised light for the wavelength-division multiplex all the way that the first reception demultiplexing module is used to receive
It is demultiplexed, the first emergent light of output multi-channel different wave length；
The second WDM optical transmission equipment 72 includes: that the second transmitting Multiplexing module and second receive demultiplexing mould
Block, and the second spectral module being connected respectively with the second transmitting Multiplexing module and the second reception demultiplexing module,
Wherein:
The second transmitting Multiplexing module is used to the second incident light of multichannel different wave length carrying out wavelength-division multiplex and polarization
Conversion, the second direction polarised light of output wavelength-division multiplex all the way is to the second spectral module；
Second spectral module is used to the second direction polarised light of the wavelength-division multiplex all the way passing through the optical fiber cable
Road is exported to the first WDM optical transmission equipment, and, first wavelength-division multiplex is received by same fibre circuit
The first direction polarised light of the wavelength-division multiplex all the way of optical transmission device output, and export to described second and receive demultiplexing module；
The first direction polarised light for the wavelength-division multiplex all the way that the second reception demultiplexing module is used to receive
It is demultiplexed, the second emergent light of output multi-channel different wave length.
In one embodiment, the second of the wavelength-division multiplex all the way that first spectral module is also used to receive
Direction polarised light is divided into two beams, and a branch of output to described first receives demultiplexing module, and another beam is exported to first transmitting
Multiplexing module；The second direction polarised light that the first transmitting Multiplexing module is also used to input first spectral module
It is isolated；
The first direction polarised light for the wavelength-division multiplex all the way that second spectral module is also used to receive is divided into
Two beams, a branch of output to described second receive demultiplexing module, and another beam is exported to the second transmitting Multiplexing module；Described
Two transmitting Multiplexing modules are also used to for the first direction polarised light that second spectral module inputs being isolated.
It is proximal end with the first WDM optical transmission equipment 71, the second WDM optical transmission equipment 72 is remote referring to Fig. 8
End, first direction are referred to as X to second direction is referred to as Y-direction, and spectral module is optical splitter, and transmitting Multiplexing module includes wave
Division multiplexer (Multiplexer, MUX) and the polarizer, receiving demultiplexing module includes solution wavelength division multiplexer (De-
Multiplexer, DMUX) and analyzer for, be illustrated.
The modules for including inside first WDM optical transmission equipment 71, the second WDM optical transmission equipment 72 it
Between can with short fiber be connected, the short fiber is usually 0.5 meter or so, can also be shorter or longer, the application is without limitation.
It is connected between first WDM optical transmission equipment 71 and the second WDM optical transmission equipment 72 using long optical fibers, the long light
Fibre, which is typically larger than, is equal to 10 kilometers, can also be shorter or longer, and the application is without limitation.
Wherein, wavelength division multiplexer (MUX) reconciliation wavelength division multiplexer (DMUX) constitutes wavelength division multiplexer group, the polarizer and inspection
Inclined device constitutes the polarizer and analyzer group.
Wherein, wavelength division multiplexer group in proximal end is connected with proximal end polarizer analyzer group, realizes the multiplex mistake of nearside transmitting terminal
Journey and light are polarized process, or realize the analyzing process and partial wave process of nearside receiving end light；Proximal end polarizer analyzer group
It is connected with proximal end optical splitter, realize the remittance of polarised light and returns the separation of light；Proximal end optical splitter and distal end optical branching
Device is connected by long optical fibers；Distal end optical splitter is connected with the distal end polarizer and analyzer group；The distal end polarizer and analyzer group
It is connected with distal end wavelength division multiplexer group.
Proximal end wavelength division multiplexer group realizes the optical signal multiplex of proximal end different wave length, and the difference of separation multiplex together
The passback optical signal of wavelength.For single channel 25G optical module, the signal for transmitting 100G needs proximal end wavelength division multiplexer group to have 4
(scheme that more high bandwidth requires, wavelength division multiplexer group port number is unrestricted, and number of channels N, N are in a different wave length channel
Natural number greater than 1).
In the proximal end polarizer and analyzer group, the polarizer, which is realized, carries out polarization operation to the optical signal after multiplex, will not
The optical signal of co-wavelength be polarized for X-direction polarization linearly polarized light (X-direction here can be any direction, with the subsequent side Y
To difference；Preferably, X-direction and Y-direction are mutually perpendicular to)；The analyzing direction of proximal end analyzer is Y-direction, is realized to remote
The straight-through of multiplex optical signal (Y-direction polarization) is held, while reflected X polarised light can also be filtered, to greatest extent
Reduction optical fiber link reflection caused by interfere.
Proximal end optical splitter/distal end optical splitter cooperation proximal end analyzer/distal end analyzer is realized to transmitting-receiving both direction
Optical signal separation.Here other optical splitters substitution, such as photo-coupler also can be used in optical splitter.With proximal end optical branching
For device splitting ratio is 1:H (H according to demand depending on, general H≤1, H are bigger, and link budget is better): the multiplex light of distal end passback
Signal is the linearly polarized light of Y-direction polarization, which is divided into two via proximal end optical splitter, and accounting is the Y-direction of H
Polarised light leads to proximal end analyzer, since analyzer is Y-direction polarization, directly passes through；The Y-direction polarised light that accounting is 1 leads to proximal end
The polarizer is directly isolated since the polarizer is X to polarization.
Distal end optical splitter realizes function identical with proximal end optical splitter: the multiplex optical signal transmitted by proximal end is X
The linearly polarized light of direction polarization, the x-ray polarised light are divided into two via distal end optical splitter, and accounting is that the X of H leads to polarised light
Distal end analyzer directly passes through since analyzer is X to polarization；The X that accounting is 1 leads to the distal end polarizer to polarised light, due to
The polarizer is Y-direction polarization, is directly isolated.
The effect of the distal end polarizer and analyzer group and the proximal end polarizer and analyzer group are essentially identical, it should be pointed out that
It is that the direction that is polarized of the distal end polarizer is Y-direction, and the direction that is polarized of distal end analyzer is X-direction.
Distal end wavelength division multiplexer group is identical as proximal end wavelength division multiplexer group effect.Realize the multiplex optical signal transmitted to proximal end
Separation, while to the different wave length optical signal multiplex for being distally back to proximal end.Channel parameters are identical as proximal end.
As shown in figure 9, proximal end transmitting provides the optical signal of the road N different wave length, different data-signals is carried respectively.Wavelength
Interval can choose the 20nm of CWDM (Coarse Wavelength Division Multiplexing, coarse wavelength division multiplexer),
Also can choose the DWDM of smaller interval, (Dense Wavelength Division Multiplexing, dense wavelength division are multiple
With), particular determination is not done here.Light source can also can choose circular polarization or elliptical polarization with unbiased polarization state, if selection line is inclined
Shake light, then selects the polarised light of polarization direction (i.e. first direction) consistent with direction of the launch polarization state.The optical power ratio of light source with
Past laser is more slightly higher, this mainly considers the influence of subsequent optical splitter partial wave.It is multiple that each road optical signal enters wavelength-division
After MUX with device group, it will converge as light wave all the way, and be transferred to proximal end X to polarizer from short fiber, finally export and wrap all the way
The X of the different wave length of kind containing N is to polarised light.It is that Y-direction polarizes that distal end transmitting link, which is back to proximal end X to the polarization direction of polarizer,
Directly it is isolated.
Proximal end analyzer selects folk prescription to for Y-direction, and is that Y-direction is inclined by the multiplex optical signal that distal end transmitting link provides
Vibration, therefore directly pass through proximal end Y-direction analyzer.Since there may be many optical fiber distribution frame with outside plant in the link of distal end, it is understood that there may be some X to
The reflected light of polarization, these X can enter proximal end Y-direction analyzer to the reflected light of polarization, but due to analyzing direction Y and be polarized direction
X is different, is directly isolated.After the Y-direction analyzer of proximal end, the multiplex optical signal of passback enters proximal end solution wavelength division multiplexer
DMUX, the optical signal for being divided into different wave length enter corresponding receiving end.
In above-described embodiment, proximal end optical splitter/distal end optical splitter cooperation proximal end analyzer/distal end analyzer realization pair
The optical signal separation for receiving and dispatching both direction, is completed at the same time the injection of proximal end transmitting optical signal.Its connection figure is as shown in Figure 10.
In the present embodiment, proximal end optical splitter and distal end optical splitter are all made of Y type splitter (but not limited to this), and each
From beam splitting capabilities ratio it is not necessarily identical.The beam splitting capabilities ratio of proximal end optical splitter is set as 1:H (H≤1), the light splitting of distal end splitter
Power ratio is set as H:1, can guarantee that the receiving side at far and near both ends obtains the optical signal of more high-power ratio in this way, reduce optical power
Loss.The X that proximal end issues so directly fully enters long optical fibers via proximal end optical splitter to polarized composite wave optical signal, and
Distal end analyzer is entered with biggish score H at the splitter of distal end.And the Y-direction polarized composite wave optical signal that distal end returns is with same
Score H enter proximal end analyzer.H value is the bigger the better, here for example: if H=1, means the receives link at both ends
50% light signal energy will be lost, link directly generates 3dB loss；If H=9, mean that the receives link at both ends will
10% light signal energy can be lost, link directly generates 0.46dB loss；If H=99, mean the receives link at both ends
1% light signal energy will be lost, link directly generates 0.04dB loss.
In above-described embodiment, distal end wavelength division multiplexer group is identical as proximal end wavelength division multiplexer group effect, while distal end is polarized
Device and analyzer group with the proximal end polarizer and the effect of analyzer group be also it is similar, connection figure is as shown in figure 11.Different from close
End, the analyzer of distal end is X to polarization, and the distal end polarizer is Y-direction polarization.
As shown in figure 12, in Wave division multiplexing optical transmission system, proximally to distal end, the implementation method of WDM optical transmission
Include:
Step 1201, proximal end transmitter issues multi beam different wave length optical signal, obtains the incident light of multichannel different wave length；
It step 1202, is all the way by proximal end wavelength division multiplexer MUX multiplex by the incident light of multichannel different wave length；
Step 1203, the optical signal (i.e. multiplex optical signal) of wavelength-division multiplex is by being converted into X to polarization when the polarizer of proximal end
Light；
Step 1204, the X of wavelength-division multiplex enters forward pass long optical fibers by optical splitter to polarised light；
Step 1205, the X of wavelength-division multiplex enters distal end optical splitter to polarised light, and accounting is that the light beam of H enters distal end inspection
Inclined device；
Step 1206, distal end analyzer judges whether to be X to polarised light, if so, step 1208 is executed, if it is not, executing step
Rapid 1207；
Step 1207, non-X is isolated to polarised light；
Step 1208, X directly passes through distal end analyzer to polarised light；
Step 1209, the X of wavelength-division multiplex is separated to polarised light via distal end solution wavelength division multiplexer DMUX, and is passed to corresponding
Far-end receivers.
As shown in figure 13, similar with step shown in Figure 12, in Wave division multiplexing optical transmission system, from distal end to proximal end, wave
The implementation method of point Multiplex optical transmission includes:
Step 1301, remote transmitters issue multi beam different wave length optical signal, obtain the incident light of multichannel different wave length；
It step 1302, is all the way by distal end wavelength division multiplexer MUX multiplex by the incident light of multichannel different wave length；
Step 1303, the optical signal (i.e. multiplex optical signal) of wavelength-division multiplex is by being converted into Y-direction polarization when the polarizer of distal end
Light；
Step 1304, the Y-direction polarised light of wavelength-division multiplex enters forward pass long optical fibers by optical splitter；
Step 1305, the Y-direction polarised light of wavelength-division multiplex enters proximal end optical splitter, and the light beam that accounting is H enters proximal end inspection
Inclined device；
Step 1306, proximal end analyzer judges whether it is Y-direction polarised light, if so, step 1308 is executed, if it is not, executing step
Rapid 1307；
Step 1307, non-Y-direction polarised light is isolated；
Step 1308, Y-direction polarised light directly passes through proximal end analyzer；
Step 1309, the Y-direction polarised light of wavelength-division multiplex is via proximal end solution wavelength division multiplexer DMUX separation, and is passed to corresponding
Near-end receivers.
As shown in figure 14, be the distressed structure figure of Fig. 8 embodiment, wherein wavelength division multiplexer be polarized/the position of analyzer
It exchanges, proximal end transmitter issues multi beam different wave length optical signal, and X is converted into when via the proximal end polarizer to polarised light, by close
Holding wavelength division multiplexer MUX multiplex is all the way that then multiplex signal enters long optical fibers by optical splitter and reaches distal end optical branching
Device, accounting are that the light beam of H enters distal end solution wavelength division multiplexer DMUX separation, and the light beam of last each wavelength enters distal end X analyzing
Device, Y-direction polarization are directly isolated, and X directly passes through to polarised light, and is passed to each far-end receivers.The case where remote transmitters with
It is above-mentioned similar.
As shown in figure 15, it is the Wave division multiplexing optical transmission system application scenarios schematic diagram of the embodiment of the present invention, passes through wavelength-division
Single fiber bi-directional transmission 100Gbps bandwidth (with the increase of number of channels, bandwidth can achieve higher) optical signal is realized in multiplexing
Scene.BBU (Building Baseband Unit, indoor baseband processing unit) and RRU in figure (Remote Radio Unit,
Remote radio unit (RRU)) two sides transmitting terminal configures 25G optical port 4 (N=4), and each channel is all made of different wave length, uses here
4 wavelength (but not limited to this) of CWDM, it can realize transmitted in both directions 100G bandwidth in single long optical fibers, the drop of top
The low usage amount of optical fiber.
It as shown in figure 16, is the Wave division multiplexing optical transmission system another application schematic diagram of a scenario of the embodiment of the present invention, wherein
The WDM optical transmission equipment of the embodiment of the present invention is as optical module, wavelength division multiplexer group, the polarizer and analyzer group, light point
Road device has been integrated in inside optical module, and basic connection structure is same as the previously described embodiments.The road N Laser (laser) in figure
Wavelength be all different, PD (Photo-Diode, photodiode) can be PIN (PIN diode, PIN diode) or
APD (Avalanche Photo-Diode, avalanche photodide), this optical module only need an optical fiber that can realize
Mating operation, workflow are identical as Figure 12 and Figure 13.
Although disclosed herein embodiment it is as above, the content only for ease of understanding the present invention and use
Embodiment is not intended to limit the invention.Technical staff in any fields of the present invention is taken off not departing from the present invention
Under the premise of the spirit and scope of dew, any modification and variation, but the present invention can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (15)
1. a kind of WDM optical transmission equipment characterized by comprising transmitting Multiplexing module and reception demultiplexing module, with
And the spectral module being connected respectively with the transmitting Multiplexing module and the reception demultiplexing module, in which:
The transmitting Multiplexing module is used to the incident light of multichannel different wave length carrying out wavelength-division multiplex and polarization conversion, and output is all the way
The first direction polarised light of wavelength-division multiplex is to the spectral module；
The spectral module is used to by fibre circuit export the first direction polarised light of the wavelength-division multiplex all the way to opposite end,
And the second direction polarised light of the wavelength-division multiplex all the way from the opposite end is received by same fibre circuit, and will be described
The second direction of wavelength-division multiplex polarizes light output to the reception demultiplexing module all the way；
The second direction polarised light for receiving the wavelength-division multiplex all the way that demultiplexing module is used to receive demultiplexes
With the emergent light of output multi-channel different wave length；
Wherein, the first direction is different from second direction.
2. WDM optical transmission equipment as described in claim 1, which is characterized in that
The second direction for the wavelength-division multiplex all the way that the spectral module is also used to receive polarizes light output to the hair
Penetrate Multiplexing module；
The second direction polarised light that the transmitting Multiplexing module is also used to receive is isolated.
3. WDM optical transmission equipment as claimed in claim 2, which is characterized in that the transmitting Multiplexing module includes being connected
Wavelength division multiplexer and the polarizer, in which:
The wavelength division multiplexer is used to carrying out the incident light of multichannel different wave length wavelength-division multiplex output, and wavelength-division multiplex enters all the way
Light is penetrated to the polarizer；
The polarizer is used to carry out the incident light of the wavelength-division multiplex all the way polarization conversion, output all the way wavelength-division multiplex the
One direction polarised light is to spectral module；And the second direction polarised light received is isolated.
4. WDM optical transmission equipment as claimed in claim 2, which is characterized in that the transmitting Multiplexing module includes being connected
The polarizer and wavelength division multiplexer, in which:
The polarizer is used to the incident light of multichannel different wave length carrying out polarization conversion, and output multi-channel first direction polarised light is extremely
The wavelength division multiplexer；And the second direction polarised light of the multichannel different wave length received is isolated；
The wavelength division multiplexer is used to carrying out multichannel first direction polarised light into first that wavelength-division multiplex exports wavelength-division multiplex all the way
Direction polarised light is to spectral module；And demultiplex the second direction polarised light for receiving wavelength-division multiplex all the way, it exports
The second direction polarised light of multichannel different wave length is to the polarizer.
5. WDM optical transmission equipment as claimed in claim 2, which is characterized in that the reception demultiplexing module includes solution
Wavelength division multiplexer, in which:
The solution wavelength division multiplexer is for demultiplexing the second direction polarised light of the wavelength-division multiplex all the way, output multi-channel
The emergent light of different wave length.
6. WDM optical transmission equipment as claimed in claim 5, which is characterized in that the reception demultiplexing module further includes
Analyzer, the spectral module, analyzer reconciliation wavelength division multiplexer are sequentially connected, alternatively, the spectral module, solution wavelength-division multiplex
Device and analyzer are sequentially connected；
The analyzer is for only passing through second direction polarised light.
7. WDM optical transmission equipment as claimed in claim 2, which is characterized in that the spectral module be optical splitter or
Photo-coupler.
8. WDM optical transmission equipment as claimed in claim 7, which is characterized in that the optical splitter is Y type optical branching
Device, the beam splitting capabilities ratio of the Y type optical splitter are 1:H, and the H is more than or equal to 1, wherein the light splitting of the Y type optical splitter
One end that 1 is corresponded in power ratio connects the transmitting Multiplexing module, corresponds in the beam splitting capabilities ratio of the Y type optical splitter
One end of H connects the reception demultiplexing module.
9. the WDM optical transmission equipment as described in any one of claim 1~8, which is characterized in that further include: first
Conversion module and the second conversion module, in which:
First conversion module is connected with the transmitting Multiplexing module, for multichannel input electrical signal to be converted to the multichannel
The incident light of different wave length；
Second conversion module is connected with the reception demultiplexing module, for turning the emergent light of the multichannel different wave length
It is changed to multiple-channel output electric signal.
10. the WDM optical transmission equipment as described in any one of claim 1~8, which is characterized in that
The first direction is mutually perpendicular to second direction.
11. a kind of Wave division multiplexing optical transmission system characterized by comprising the first WDM optical transmission equipment and the second wave
Multiplex optical transmission equipment, the first WDM optical transmission equipment and the second WDM optical transmission equipment is divided to pass through light all the way
Fine route is connected；
The first WDM optical transmission equipment is for by the first incident light progress wavelength-division multiplex of multichannel different wave length and partially
Vibration conversion, the first direction polarised light of output wavelength-division multiplex all the way is to the second WDM optical transmission equipment；And it receives
The second direction polarised light for the wavelength-division multiplex all the way that the second WDM optical transmission equipment is exported by the fibre circuit,
It is demultiplexed, the first emergent light of output multi-channel different wave length；
The second WDM optical transmission equipment is used to receive the wave all the way of the first WDM optical transmission equipment output
The first direction polarised light for dividing multiplexing, is demultiplexed, the second emergent light of output multi-channel different wave length；And not by multichannel
Second incident light of co-wavelength carries out wavelength-division multiplex and polarization conversion, and the second direction polarised light of output wavelength-division multiplex all the way is to institute
State the first WDM optical transmission equipment；
Wherein, the first direction is different from second direction.
12. Wave division multiplexing optical transmission system as claimed in claim 11, which is characterized in that
The first WDM optical transmission equipment includes: the first transmitting Multiplexing module and first receives demultiplexing module, and
The first spectral module being connected respectively with the first transmitting Multiplexing module and the first reception demultiplexing module, in which:
The first transmitting Multiplexing module is used to the first incident light of multichannel different wave length carrying out wavelength-division multiplex and polarization conversion,
The first direction polarised light of output wavelength-division multiplex all the way is to the first spectral module；
First spectral module is used for the first direction polarised light of the wavelength-division multiplex all the way is defeated by the fibre circuit
Out to the second WDM optical transmission equipment, and, pass through same fibre circuit and receive second wavelength division multiplexed light and passes
The second direction polarised light of the wavelength-division multiplex all the way of transfer device output, and export to described first and receive demultiplexing module；
The second direction polarised light for the wavelength-division multiplex all the way that the first reception demultiplexing module is used to receive carries out
Demultiplexing, the first emergent light of output multi-channel different wave length；
The second WDM optical transmission equipment includes: the second transmitting Multiplexing module and second receives demultiplexing module, and
The second spectral module being connected respectively with the second transmitting Multiplexing module and the second reception demultiplexing module, in which:
The second transmitting Multiplexing module is used to the second incident light of multichannel different wave length carrying out wavelength-division multiplex and polarization conversion,
The second direction polarised light of output wavelength-division multiplex all the way is to the second spectral module；
Second spectral module is used for the second direction polarised light of the wavelength-division multiplex all the way is defeated by the fibre circuit
Out to the first WDM optical transmission equipment, and, pass through same fibre circuit and receive first wavelength division multiplexed light and passes
The first direction polarised light of the wavelength-division multiplex all the way of transfer device output, and export to described second and receive demultiplexing module；
The first direction polarised light for the wavelength-division multiplex all the way that the second reception demultiplexing module is used to receive carries out
Demultiplexing, the second emergent light of output multi-channel different wave length.
13. Wave division multiplexing optical transmission system as claimed in claim 12, which is characterized in that
The second direction for the wavelength-division multiplex all the way that first spectral module is also used to receive polarizes light output to institute
State the first transmitting Multiplexing module；The first transmitting Multiplexing module is also used to carry out the second direction polarised light received
Isolation；
The first direction for the wavelength-division multiplex all the way that second spectral module is also used to receive polarizes light output to institute
State the second transmitting Multiplexing module；The second transmitting Multiplexing module is also used to carry out the first direction polarised light received
Isolation.
14. a kind of implementation method of WDM optical transmission, comprising:
The first direction that the incident light progress wavelength-division multiplex and polarization conversion of multichannel different wave length are obtained wavelength-division multiplex all the way is inclined
Shake light, will be exported by fibre circuit to opposite end described in the first direction polarised light of the wavelength-division multiplex all the way；And
The second direction polarised light that the wavelength-division multiplex all the way from the opposite end is received by same fibre circuit, by described in all the way
The second direction polarised light of wavelength-division multiplex is demultiplexed, the emergent light of output multi-channel different wave length；
Wherein, the first direction is different from second direction.
15. method as claimed in claim 14, which is characterized in that the incident light by multichannel different wave length carries out wavelength-division and answers
With the first direction polarised light for obtaining wavelength-division multiplex all the way with polarization conversion, comprising:
The incident light of multichannel different wave length is subjected to wavelength-division multiplex, obtains the incident light of wavelength-division multiplex all the way；It will the wave all the way
Divide the incident light of multiplexing to carry out polarization conversion, obtains the first direction polarised light of wavelength-division multiplex all the way；Or
The incident light of multichannel different wave length is subjected to polarization conversion, obtains multichannel first direction polarised light；By the multichannel first
Direction polarised light carries out wavelength-division multiplex, obtains the first direction polarised light of wavelength-division multiplex all the way.
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| CN201810052254.6A CN110061798A (en) | 2018-01-19 | 2018-01-19 | WDM optical transmission equipment, system and implementation method |
| PCT/CN2018/116269 WO2019140999A1 (en) | 2018-01-19 | 2018-11-19 | Wavelength division multiplexing optical transmission apparatus and system, and implementation method |
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| CN113067660A (en) * | 2020-01-02 | 2021-07-02 | 中国移动通信集团设计院有限公司 | Semi-active wavelength division multiplexing system |
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