CN106788704B - The measuring system and method for less fundamental mode optical fibre intermode delay based on synchronizing sequence - Google Patents
The measuring system and method for less fundamental mode optical fibre intermode delay based on synchronizing sequence Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2569—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to polarisation mode dispersion [PMD]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07951—Monitoring or measuring chromatic dispersion or PMD
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Abstract
The measuring system and method for the less fundamental mode optical fibre intermode delay based on synchronizing sequence that the invention discloses a kind of, are related to optical communication field.Method includes the following steps: transmitting terminal generates one group of synchronizing sequence, it is modulated on light carrier, is divided into the road N single mode optical signal, carry out different delays, coupling becomes N mode multiplexing optical signal all the way and inputs less fundamental mode optical fibre to be measured；Receiving end is demultiplexed, obtain the road N single mode optical signal, recover the synchronizing sequence information of the road N single mode optical signal, digital signal processing module determines the relative starting time position of the received road N synchronizing sequence, it is compared with the road transmitting terminal N synchronizing sequence relative starting time position, the relative time delay between any two mode is obtained, in conjunction with the length of less fundamental mode optical fibre to be measured, calculates the intermode delay parameter in less fundamental mode optical fibre to be measured between any two mode.Cost of the invention significantly reduces, and applies on a large scale under engineering specifications suitable for future.
Description
Technical field
The present invention relates to optical communication fields, are specifically related to a kind of survey of less fundamental mode optical fibre intermode delay based on synchronizing sequence
Measure system and method.
Background technique
With internet, cloud computing, the fast development of mobile broadband, data center, network transmission bandwidth demand presents quick-fried
Fried formula increases, and pushes the development of vast capacity optical transmission system.In order to promote the capacity of existing optical transmission system, wavelength-division multiplex
Technology, digital coherent receive and the key technologies such as low noise light amplification are considered as that hoist capacity efficiently solves scheme.From
The end of the eighties in last century, wavelength-division multiplex technique are introduced into after fiber optic communication field, and single mode optical fiber single fiber transmission capacity is just at double
Increase.Only in nearest 15 years, the single mode optical fiber single fiber transmission capacity obtained in laboratory is just rapidly spread to from 10Tbit/s
More than 100Tbit/s.In terms of practical commercial system, commercial single channel 100G DWDM (Dense on a large scale at present
Wavelength Division Multiplexing, dense wave division multipurpose) the full configuration channel quantity of Transmission system alreadys exceed
180 waves, total capacity is close to the 20Tbit/s order of magnitude.With the development of next-generation single channel 400G/1T optical transport technology, commercial bone
Dry net single fiber transmission capacity will also be close to or up to the 100Tbit/s order of magnitude quickly.
As single mode optical fiber transmission capacity is more and more close to its theoretical limit, in order to further increase light transmission capacity, dash forward
The aromatic limit of broken single mode optical fiber transmission, it is (few mould, more that sight has all been turned to space division multiplexing technology by the research institution of countries in the world
Core, spatial light angular momentum) research.And less fundamental mode optical fibre transmission technology therein, because it puts in multiplex/demultiplex mode, link
Advantage in big device energy consumption and unit cross-sectional area efficiency of transmission, it is considered to be the mainstream technology of next-generation optical transport network.
Due to allowing the light of multiple modes to propagate simultaneously in less fundamental mode optical fibre, and the light wave of different mode due to it in a fiber
The difference of propagation path, leads to that there are intermode delays.In less fundamental mode optical fibre transmission technology, due in optical fiber intermode be delayed deposit
The complexity of the digital signal processing algorithm of receiving end is being caused to greatly increase.Therefore the intermode delay in less fundamental mode optical fibre is few
One crucial parameter of mode fiber, it is necessary to accurately measure.Traditional less fundamental mode optical fibre intermode Time delay measurement equipment uses
Pure optical principle, it is with high costs although measurement accuracy is higher, it is not suitable for following answering on a large scale under engineering specifications
With.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned background technique, a kind of few mould light based on synchronizing sequence is provided
The measuring system and method for fine intermode delay, cost are significantly reduced compared to traditional pure measuring method, are existed suitable for following
It is applied on a large scale under engineering specifications.
The present invention provides a kind of measuring system of less fundamental mode optical fibre intermode delay based on synchronizing sequence, which includes sending
End and receiving end, the transmitting terminal include that synchronizing sequence generator, optical modulator, splitting ratio are that the optical splitter of 1:N, mode are multiple
With device, N is the pattern count that less fundamental mode optical fibre to be measured allows to propagate, and N is positive integer, and receiving end includes pattern demultiplexer, the spy of N number of light
Device, digital signal processing module are surveyed,
In transmitting terminal, the synchronizing sequence that synchronizing sequence generator generates one group of specific bit rate, time span is T, light tune
Synchronizing sequence is modulated on light carrier by device processed, obtains single mode optical signal all the way, single-mode optics signal divides optical splitter all the way by this
For the road N single mode optical signal, they are inputted to the single mode optical fiber delay line of different length respectively, this road N single mode optical signal is carried out
Different delay, in which: the 1st road single mode optical signal is without delay, and the 2nd road single mode optical signal is by delay T, the 3rd road single mode
Optical signal is by the delay road 2T ... ... N single mode optical signal by delay (N-1) * T；Pattern multiplexer will pass through the road N of delay
The coupling of single mode optical signal becomes N mode multiplexing optical signal all the way, wherein originally the 1st road to the road N single mode optical signal respectively corresponds
As the mode 1 in N mode multiplexing optical signal all the way, mode 2, mode 3 ... mode N；By this N mode multiplexing optical signal all the way
Input less fundamental mode optical fibre to be measured；
In receiving end, pattern demultiplexer demultiplexes the mode multiplexing optical signal of N all the way received, obtains the road N
The road N single mode optical signal is inputted in the optical detector of the road N exact matching respectively, recovers the road N single mode optical signal by single mode optical signal
Synchronizing sequence information, digital signal processing module by the received road N synchronizing sequence information and known synchronizing sequence information into
The comparison one by one of row step-by-step or synchronous related operation, determine the relative starting time position of the road the N synchronizing sequence received: t1、
t2……tN, by t1、t2……tNWith the road transmitting terminal N synchronizing sequence relative starting time position: 0, T, 2T ... (N-1) * T are carried out
Comparison, obtains the relative time delay between any two mode, in conjunction with the length of less fundamental mode optical fibre to be measured, calculates few mould light to be measured
Intermode delay parameter in fibre between any two mode.
Based on the above technical solution, the intermode in the less fundamental mode optical fibre to be measured between any two mode, which is delayed, joins
Several calculating process is as follows: the calculating process of the intermode delay parameter between mode 1 and mode 2 is as follows: in transmitting terminal, mode 1
With the delay D between 2 optical signal of modeT=T-0=T；Delay D in receiving end, between 2 optical signal of mode 1 and modeR=
t2- t1；The delay D that mode 1 and 2 optical signal of mode generate in less fundamental mode optical fibre to be measuredF=DR- DT=t2- t1- T；Assuming that
The length for surveying less fundamental mode optical fibre is L, then the intermode delay parameter C in less fundamental mode optical fibre to be measured between mode 1 and mode 21-2=DF÷ L,
And so on, calculate the intermode delay parameter in less fundamental mode optical fibre to be measured between any two mode.
Based on the above technical solution, the optical modulator uses electro-optic modulator, and optical detector is using balance light
Detector, optical-electronic demodulator or integrated coherent receiver.
Based on the above technical solution, the electro-optic modulator is directly modulated lasers, electric absorption optical modulator, MZM
Optical modulator or IQ optical modulator.
Based on the above technical solution, the pattern multiplexer and pattern demultiplexer are all made of photon lantern.
The present invention also provides a kind of measurements of less fundamental mode optical fibre intermode delay based on synchronizing sequence applied to above system
Method, comprising the following steps:
In transmitting terminal, the synchronizing sequence that synchronizing sequence generator generates one group of specific bit rate, time span is T, light tune
Synchronizing sequence is modulated on light carrier by device processed, obtains single mode optical signal all the way, single-mode optics signal divides optical splitter all the way by this
For the road N single mode optical signal, they are inputted to the single mode optical fiber delay line of different length respectively, this road N single mode optical signal is carried out
Different delay, in which: the 1st road single mode optical signal is without delay, and the 2nd road single mode optical signal is by delay T, the 3rd road single mode
Optical signal is by the delay road 2T ... ... N single mode optical signal by delay (N-1) * T；Pattern multiplexer will pass through the road N of delay
The coupling of single mode optical signal becomes N mode multiplexing optical signal all the way, wherein originally the 1st road to the road N single mode optical signal respectively corresponds
As the mode 1 in N mode multiplexing optical signal all the way, mode 2, mode 3 ... mode N；By this N mode multiplexing optical signal all the way
Input less fundamental mode optical fibre to be measured；
In receiving end, pattern demultiplexer demultiplexes the mode multiplexing optical signal of N all the way received, obtains the road N
The road N single mode optical signal is inputted in the optical detector of the road N exact matching respectively, recovers the road N single mode optical signal by single mode optical signal
Synchronizing sequence information, digital signal processing module by the received road N synchronizing sequence information and known synchronizing sequence information into
The comparison one by one of row step-by-step or synchronous related operation, determine the relative starting time position of the road the N synchronizing sequence received: t1、
t2……tN, by t1、t2……tNWith the road transmitting terminal N synchronizing sequence relative starting time position: 0, T, 2T ... (N-1) * T are carried out
Comparison, obtains the relative time delay between any two mode, in conjunction with the length of less fundamental mode optical fibre to be measured, calculates few mould light to be measured
Intermode delay parameter in fibre between any two mode.
Based on the above technical solution, the intermode in the less fundamental mode optical fibre to be measured between any two mode, which is delayed, joins
Several calculating process is as follows: the calculating process of the intermode delay parameter between mode 1 and mode 2 is as follows: in transmitting terminal, mode 1
With the delay D between 2 optical signal of modeT=T-0=T；Delay D in receiving end, between 2 optical signal of mode 1 and modeR=
t2- t1；The delay D that mode 1 and 2 optical signal of mode generate in less fundamental mode optical fibre to be measuredF=DR- DT=t2- t1- T；Assuming that
The length for surveying less fundamental mode optical fibre is L, then the intermode delay parameter C in less fundamental mode optical fibre to be measured between mode 1 and mode 21-2=DF÷ L,
And so on, calculate the intermode delay parameter in less fundamental mode optical fibre to be measured between any two mode.
Based on the above technical solution, the optical modulator uses electro-optic modulator, and optical detector is using balance light
Detector, optical-electronic demodulator or integrated coherent receiver.
Based on the above technical solution, the electro-optic modulator is directly modulated lasers, electric absorption optical modulator, MZM
Optical modulator or IQ optical modulator.
Based on the above technical solution, the pattern multiplexer and pattern demultiplexer are all made of photon lantern.
Compared with traditional pure optical means, advantages of the present invention is as follows:
(1) all photoelectric devices for using of the present invention are mature commercial products, therefore its cost is pure compared to traditional
Measuring method significantly reduces, and applies on a large scale under engineering specifications suitable for future.
(2) the principle of the present invention is relatively simple, therefore system reliability is also higher.
(3) space optical path of traditional measuring method Structure of need complexity is realized, therefore measuring device often volume
It is larger to be unfavorable for engineer application.Simple in measurement system structure of the invention is compact, and all components can integrate on veneer,
Convenient for the integrated and commercialization of system, conducive to the engineering application of product.
Detailed description of the invention
Fig. 1 is the structural frames of the measuring system of the less fundamental mode optical fibre intermode delay in the embodiment of the present invention based on synchronizing sequence
Figure.
Fig. 2 is the system structure diagram of a specific embodiment.
Fig. 3 is the signal of synchronizing sequence relative starting time position on 3 road mode optical signal of transmitting terminal in present example
Figure.
Fig. 4 is the signal of synchronizing sequence relative starting time position on 3 road mode optical signal of receiving end in present example
Figure.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of measurement of less fundamental mode optical fibre intermode delay based on synchronizing sequence
System, including transmitting terminal and receiving end, transmitting terminal include synchronizing sequence generator, optical modulator, the optical branching that splitting ratio is 1:N
Device, pattern multiplexer, N are the pattern counts that less fundamental mode optical fibre to be measured allows to propagate, and N is positive integer, and receiving end includes mode demultiplexing
Device, N number of optical detector, digital signal processing module.
The embodiment of the present invention also provides a kind of less fundamental mode optical fibre intermode delay based on synchronizing sequence applied to above system
Measurement method, comprising the following steps:
In transmitting terminal, synchronizing sequence generator generates the synchronizing sequence of one group of specific bit rate, the time of the synchronizing sequence
Length is T, and synchronizing sequence is modulated on light carrier by optical modulator, obtains single mode optical signal all the way.By this, single-mode optics are believed all the way
The optical splitter that number input splitting ratio is 1:N, so that single-mode optics signal is divided into the road N single mode optical signal all the way by this, by they point
Not Shu Ru different length single mode optical fiber delay line, to carry out different delays to this road N single mode optical signal, in which: the 1st tunnel
Single mode optical signal is without delay, and the 2nd road single mode optical signal is by delay T, and the 3rd road single mode optical signal is by delay 2T ... ...
For the road N single mode optical signal by delay (N-1) * T, the purpose of delay is that the road N optical signal is avoided to occur in less fundamental mode optical fibre to be measured
Serious aliasing leads to that synchronization sequence signals can not be demodulated in receiving end；Pattern multiplexer believes the road the N single-mode optics by delay
Number coupling becomes N mode multiplexing optical signal all the way, wherein originally the 1st road to the road N single mode optical signal, which respectively corresponds, to be become all the way
Mode 1, mode 2, mode 3 ... mode N in N mode multiplexing optical signal；By this, the input of N mode multiplexing optical signal is to be measured all the way
Less fundamental mode optical fibre.
In receiving end, pattern demultiplexer demultiplexes the mode multiplexing optical signal of N all the way received, again
To the road N single mode optical signal, the road N single mode optical signal is inputted in the optical detector of the road N exact matching respectively, recover the road N single mode
The synchronizing sequence information of optical signal, and by the road N synchronizing sequence information input digital signal processing module.Digital signal processing module
By the received road N synchronizing sequence information and known synchronizing sequence information carry out step-by-step compare one by one or synchronous related operation,
So that it is determined that the relative starting time position of the road the N synchronizing sequence received: t1、t2……tN.By the receiving end road N synchronizing sequence
Relative starting time position t1、t2……tNWith the road transmitting terminal N synchronizing sequence relative starting time position (0, T, 2T ... (N-
1) * T) it compares, the relative time delay between any two mode is obtained, in conjunction with the length of less fundamental mode optical fibre to be measured, is calculated
Intermode delay parameter in less fundamental mode optical fibre to be measured between any two mode.
In mode for the delay between 1 and mode 2, the specific calculating of the intermode delay parameter between mode 1 and mode 2
Process is as follows: the delay D in transmitting terminal, between 2 optical signal of mode 1 and modeT=T-0=T；In receiving end, mode 1 and mould
Delay D between 2 optical signal of formulaR=t2- t1；The delay D that mode 1 and 2 optical signal of mode generate in less fundamental mode optical fibre to be measuredF=
DR- DT=t2- t1- T.Assuming that the length of less fundamental mode optical fibre to be measured is L, then in less fundamental mode optical fibre to be measured between mode 1 and mode 2
Intermode delay parameter C1-2=DF÷L.And so on, the mould in less fundamental mode optical fibre to be measured between any two mode can be calculated
Between delay parameter.
It is shown in Figure 2, it is assumed that less fundamental mode optical fibre to be measured is the less fundamental mode optical fibre that length is 10 kilometers, which allows three
The light propagation of a mode, three modes are respectively LP01、LP11aAnd LP11b.Firstly, being 10Gbit/s, time by one section of bit rate
The synchronizing sequence that length is 10ns, he number is 100 is modulated on light carrier by a directly modulated lasers, is obtained all the way
Optical signal, this optical splitter that optical signal is 1:3 by a splitting ratio all the way, by this, optical signal is divided into 3 to optical splitter all the way
Road, by the 1st road optical signal delay 0ns, the 2nd road optical signal delay 10ns, the 3rd road optical signal delay 20ns.
A 3 mode photon lanterns (pattern multiplexer) will be inputted by delay tri- road optical signal of Hou, and make three road single modes
Optical signal synthesizes 3 mode multiplexing signal all the way.The relative starting time position of synchronizing sequence is exactly on three mode optical signals
The delay that 3 road single mode optical signals pass through respectively before, it is shown in Figure 3.
By this, mode multiplexing signal inputs 10 kilometers of less fundamental mode optical fibres to be measured all the way.It is passed by less fundamental mode optical fibre link to be measured
After defeated, another 3 mode photon lantern (pattern demultiplexer) will be re-entered by 3 mode multiplexing signals all the way, and become three again
Road single mode optical signal.This three roads single mode optical signal is inputted PD (Photo Diode, the photoelectricity two of three exact matchings respectively again
Pole pipe), so that synchronization sequence signals entrained on tri- road optical signal of Jiang Zhe demodulate.
Then by the three tunnel synchronization sequence signals demodulated input digital signal processing module, to three road synchronizing sequences into
Row related operation finds the relative starting time position that this three tunnel receives the synchronizing sequence of signal.By comparing transmitting terminal with connect
The variation of synchronizing sequence relative starting time position on three road single mode optical signal of receiving end, so that it may obtain the optical signal of three modes
Relative time delay in single mode optical fiber to be measured.
Assuming that the relative starting time position of synchronizing sequence is as shown in Figure 4 on three road single mode optical signal of receiving end.It is sending
Hold LP01Mould and LP11aDelay between mould is 10ns, and the LP measured in receiving end01Mould and LP11aDelay between mould is
25ns, it is hereby achieved that LP01Mould and LP11aIntermode delay between mould is 25ns-10ns=15ns, and less fundamental mode optical fibre to be measured
Length is 10 kilometers, therefore LP in less fundamental mode optical fibre unit length to be measured01Mould and LP11aIntermode delay parameter between mould is 15ns
÷ 10km=1.5ps/m.And so on: LP01Mould and LP11bIntermode delay parameter between mould is 2.0ps/m；LP11aMould with
LP11bIntermode delay parameter between mould is 0.5ps/m.
The measurement method and traditional pure optical measurement that intermode is delayed in less fundamental mode optical fibre in the present invention based on synchronizing sequence
The advantages of scheme is compared, and has at low cost, high reliablity, simple and compact for structure, is conducive to the system integration and commercialization, is one kind ten
Divide the measurement method of the less fundamental mode optical fibre intermode delay parameter with practical prospect.
In the embodiment of the present invention, transmitting terminal is modulated using DML (Directly modulated laser, directly modulated lasers)
Synchronization sequence signals；Receiving end receives optical signal using photodiode；Pattern multiplexer is used with pattern demultiplexer part
Photon lantern.But the application range actually invented and practical plan are not limited to these devices: optical modulator can be electrical-optical
Modulator, electro-optic modulator can be any optical device that can be modulated to electric signal on light, such as: DML, electric absorption light tune
Device, MZM (Mach-Zehnder Modulator, Mach-Zehnder modulator) optical modulator or IQ (In-phase processed
Quadrature, inphase quadrature) optical modulator etc.；Optical detector can be any light that optical signal can be converted to electric signal
Detector, such as balance optical detector, optical-electronic demodulator or integrated coherent receiver；Pattern multiplexer and pattern demultiplexer
As long as can be achieved on the coupling of different mode light with separate, it is not limited to photon lantern.
Those skilled in the art can carry out various modifications to the embodiment of the present invention and modification, if these modifications and change
For type within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention
Within.
The prior art that the content being not described in detail in specification is known to the skilled person.
Claims (8)
1. a kind of measuring system of the less fundamental mode optical fibre intermode delay based on synchronizing sequence, which includes transmitting terminal and receiving end,
It is characterized by: it is that the optical splitter of 1:N, mode are multiple that the transmitting terminal, which includes synchronizing sequence generator, optical modulator, splitting ratio,
With device, N is the pattern count that less fundamental mode optical fibre to be measured allows to propagate, and N is positive integer, and receiving end includes pattern demultiplexer, the spy of N number of light
Device, digital signal processing module are surveyed,
In transmitting terminal, the synchronizing sequence that synchronizing sequence generator generates one group of specific bit rate, time span is T, optical modulator
Synchronizing sequence is modulated on light carrier, obtains single mode optical signal all the way, single-mode optics signal is divided into the road N to optical splitter all the way by this
They are inputted the single mode optical fiber delay line of different length by single mode optical signal respectively, and to this road N, single mode optical signal is carried out different
Delay, in which: the 1st road single mode optical signal is without delay, and the 2nd road single mode optical signal is by delay T, the 3rd road single mode optical signal
By the delay road 2T ... ... N single mode optical signal by delay (N-1) * T；Pattern multiplexer will pass through the road the N single-mode optics of delay
Signal coupling becomes N mode multiplexing optical signal all the way, wherein originally the 1st road to the road N single mode optical signal is respectively corresponded as one
Mode 1, mode 2 in the N mode multiplexing optical signal of road, mode 3 ... mode N；By this all the way N mode multiplexing optical signal input to
The less fundamental mode optical fibre of survey；
In receiving end, pattern demultiplexer demultiplexes the mode multiplexing optical signal of N all the way received, obtains the road N single mode
The road N single mode optical signal is inputted in the optical detector of the road N exact matching respectively, recovers the same of the road N single mode optical signal by optical signal
Step sequence information, digital signal processing module by the received road N synchronizing sequence information and known synchronizing sequence information carry out by
The comparison one by one of position or synchronous related operation, determine the relative starting time position of the road the N synchronizing sequence received: t1、t2……
tN, by t1、t2……tNWith the road transmitting terminal N synchronizing sequence relative starting time position: 0, T, 2T ... (N-1) * T are compared,
Obtain the relative time delay between any two mode；Intermode in the less fundamental mode optical fibre to be measured between any two mode, which is delayed, joins
Several calculating process is as follows: the calculating process of the intermode delay parameter between mode 1 and mode 2 is as follows: in transmitting terminal, mode 1
With the delay D between 2 optical signal of modeT=T-0=T；Delay D in receiving end, between 2 optical signal of mode 1 and modeR=
t2- t1；The delay D that mode 1 and 2 optical signal of mode generate in less fundamental mode optical fibre to be measuredF=DR- DT=t2- t1- T；In conjunction with
The length of less fundamental mode optical fibre to be measured, it is assumed that the length of less fundamental mode optical fibre to be measured is L, then in less fundamental mode optical fibre to be measured between mode 1 and mode 2
Intermode delay parameter C1-2=DF÷ L, and so on, calculate the intermode in less fundamental mode optical fibre to be measured between any two mode
Delay parameter.
2. the measuring system of the less fundamental mode optical fibre intermode delay based on synchronizing sequence as described in claim 1, it is characterised in that: institute
Optical modulator is stated using electro-optic modulator, optical detector is using balance optical detector, optical-electronic demodulator or integrated coherent reception
Machine.
3. the measuring system of the less fundamental mode optical fibre intermode delay based on synchronizing sequence as claimed in claim 2, it is characterised in that: institute
Stating electro-optic modulator is directly modulated lasers, electric absorption optical modulator, MZM optical modulator or IQ optical modulator.
4. the measuring system of the less fundamental mode optical fibre intermode delay based on synchronizing sequence as described in claim 1, it is characterised in that: institute
It states pattern multiplexer and pattern demultiplexer is all made of photon lantern.
5. a kind of measurement method of the less fundamental mode optical fibre intermode delay based on synchronizing sequence applied to system described in claim 1,
Characterized by comprising the following steps:
In transmitting terminal, the synchronizing sequence that synchronizing sequence generator generates one group of specific bit rate, time span is T, optical modulator
Synchronizing sequence is modulated on light carrier, obtains single mode optical signal all the way, single-mode optics signal is divided into the road N to optical splitter all the way by this
They are inputted the single mode optical fiber delay line of different length by single mode optical signal respectively, and to this road N, single mode optical signal is carried out different
Delay, in which: the 1st road single mode optical signal is without delay, and the 2nd road single mode optical signal is by delay T, the 3rd road single mode optical signal
By the delay road 2T ... ... N single mode optical signal by delay (N-1) * T；Pattern multiplexer will pass through the road the N single-mode optics of delay
Signal coupling becomes N mode multiplexing optical signal all the way, wherein originally the 1st road to the road N single mode optical signal is respectively corresponded as one
Mode 1, mode 2 in the N mode multiplexing optical signal of road, mode 3 ... mode N；By this all the way N mode multiplexing optical signal input to
The less fundamental mode optical fibre of survey；
In receiving end, pattern demultiplexer demultiplexes the mode multiplexing optical signal of N all the way received, obtains the road N single mode
The road N single mode optical signal is inputted in the optical detector of the road N exact matching respectively, recovers the same of the road N single mode optical signal by optical signal
Step sequence information, digital signal processing module by the received road N synchronizing sequence information and known synchronizing sequence information carry out by
The comparison one by one of position or synchronous related operation, determine the relative starting time position of the road the N synchronizing sequence received: t1、t2……
tN, by t1、t2……tNWith the road transmitting terminal N synchronizing sequence relative starting time position: 0, T, 2T ... (N-1) * T are compared,
Obtain the relative time delay between any two mode；Intermode in the less fundamental mode optical fibre to be measured between any two mode, which is delayed, joins
Several calculating process is as follows: the calculating process of the intermode delay parameter between mode 1 and mode 2 is as follows: in transmitting terminal, mode 1
With the delay D between 2 optical signal of modeT=T-0=T；Delay D in receiving end, between 2 optical signal of mode 1 and modeR=
t2- t1；The delay D that mode 1 and 2 optical signal of mode generate in less fundamental mode optical fibre to be measuredF=DR- DT=t2- t1- T；In conjunction with
The length of less fundamental mode optical fibre to be measured, it is assumed that the length of less fundamental mode optical fibre to be measured is L, then in less fundamental mode optical fibre to be measured between mode 1 and mode 2
Intermode delay parameter C1-2=DF÷ L, and so on, calculate the intermode in less fundamental mode optical fibre to be measured between any two mode
Delay parameter.
6. the measurement method of the less fundamental mode optical fibre intermode delay based on synchronizing sequence as claimed in claim 5, it is characterised in that: institute
Optical modulator is stated using electro-optic modulator, optical detector is using balance optical detector, optical-electronic demodulator or integrated coherent reception
Machine.
7. the measurement method of the less fundamental mode optical fibre intermode delay based on synchronizing sequence as claimed in claim 6, it is characterised in that: institute
Stating electro-optic modulator is directly modulated lasers, electric absorption optical modulator, MZM optical modulator or IQ optical modulator.
8. the measurement method of the less fundamental mode optical fibre intermode delay based on synchronizing sequence as claimed in claim 5, it is characterised in that: institute
It states pattern multiplexer and pattern demultiplexer is all made of photon lantern.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611058800.4A CN106788704B (en) | 2016-11-25 | 2016-11-25 | The measuring system and method for less fundamental mode optical fibre intermode delay based on synchronizing sequence |
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| CN201611058800.4A CN106788704B (en) | 2016-11-25 | 2016-11-25 | The measuring system and method for less fundamental mode optical fibre intermode delay based on synchronizing sequence |
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| Publication Number | Publication Date |
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| CN110501783A (en) * | 2019-08-28 | 2019-11-26 | 吉林大学 | A kind of less fundamental mode optical fibre Beam Forming System |
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| CN107677452B (en) * | 2017-10-24 | 2020-06-02 | 长飞光纤光缆股份有限公司 | Few-mode optical fiber comprehensive tester and testing method |
| CN108551367B (en) * | 2018-02-28 | 2020-08-11 | 北京邮电大学 | Transmission system and method based on mode division multiplexing |
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| CN108923857B (en) * | 2018-07-13 | 2020-01-31 | 长春理工大学 | Ultra-high-speed large-view-field receiving space laser communication receiving system |
| CN110098868A (en) * | 2019-04-09 | 2019-08-06 | 中国科学院上海光学精密机械研究所 | A kind of adaptive array reception space coherent optical communication system |
| CN111679453B (en) * | 2020-06-05 | 2023-12-29 | 吉林大学 | Microwave photon filter based on few-mode fiber Bragg grating |
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| CN114448502B (en) * | 2020-11-04 | 2024-06-11 | ***通信有限公司研究院 | Method and device for measuring differential mode time delay in degenerate mode |
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