CN107167872B - Method for identifying fiber grating code group - Google Patents
Method for identifying fiber grating code group Download PDFInfo
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- CN107167872B CN107167872B CN201710323915.XA CN201710323915A CN107167872B CN 107167872 B CN107167872 B CN 107167872B CN 201710323915 A CN201710323915 A CN 201710323915A CN 107167872 B CN107167872 B CN 107167872B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
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Abstract
The invention provides a method for identifying a fiber grating code group, which adopts a group of fiber gratings with L-band wavelength bands and U-band wavelength bands as central wavelengths to form the code group, and respectively adopts the central wavelengths, the distance lengths and the reflection energy difference as code element sequencing to play a role in uniquely identifying an optical fiber medium. The invention adopts the detection light orthogonal to the communication signal wavelength, thereby not influencing the optical cable communication, and simultaneously having simple structure, low cost and good use effect.
Description
Technical Field
The invention relates to a method for identifying a fiber grating code group, belongs to the field of fiber detection technology, and particularly relates to a method for identifying an optical fiber by utilizing the self characteristics of a grating.
Background
In the prior art, optical fiber identification is mainly to identify optical fibers by using a third-party medium, namely an electronic tag, the existing domestic market is mainly based on Hua as IODN and has multiple domestic and foreign standards, the method is mainly to embed an electronic tag reader-writer in an optical fiber distribution plate and sleeve an electronic tag ring on an optical fiber jumper so as to realize the identification of the optical cable, and the technology has the serious defect that the third-party medium is required to be used, and the electronic tags at two ends of the optical fiber jumper are required to be paired and are required not to fall off, so that the use of the technology is seriously influenced.
In the patent application with application number CN201210207967.8, for example, by setting a port identifier in an iODF device, storing the configuration information of the associated patch cord in the port, and indicating that the port is correct when the patch cord is correct, that is, when the information associated with the port identifier is consistent with the information carried by the adapter card set on the jack, this solution implements correct identification of the optical fiber by setting an additional physical device in the port, thereby ensuring the correctness of the port mating. For another example, in the patent application with application number CN200910002203.3, the SSFBG, the heating module, the temperature sensor, and the temperature controller are disposed in the optical fiber network, and the SSFBG in the optical fiber is subjected to temperature control to change the reflection wavelength thereof, so as to implement encoding on the optical fiber.
Based on the above problems in the prior art, there is a need for a method of essentially cable identification from a cable. The present invention is based on the above technical background, and improves the prior art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for identifying a fiber grating code group, which takes an optical cable as an identification medium on the premise of not influencing signal propagation so as to overcome the defects in the prior art. Specifically, the present invention provides the following technical solutions.
A fiber grating code group identification method, the method comprising: the method comprises the steps that a plurality of fiber bragg gratings with different wavelengths are arranged in an optical cable to be identified to form a fiber bragg grating group, a fiber bragg grating coding group is formed through the plurality of wavelengths of the plurality of fiber bragg gratings, and coding elements of the fiber bragg grating coding group are formed through the wavelengths corresponding to the fiber bragg gratings adopted in the fiber bragg grating coding group; and identifying the optical cable by identifying the fiber bragg grating coding group.
Preferably, the wavelength λ of the fiber grating code groupiWith a communication wavelength λ in said optical cablekOrthogonal, that is, satisfying:
where n represents the number of center wavelengths of the total fiber grating.
Preferably, the wavelength of the fiber grating coding group adopts L-band and U-band wavelength bands.
Preferably, the wavelength of the fiber grating code group adopts the wavelength in the wave band range of 1565nm to 1625 nm. The band fiber is less attenuated and is not used for communication service.
Preferably, a fiber grating with a fixed wavelength is respectively used as a start-stop fiber grating of the fiber grating code group, and the start-stop fiber grating and the fiber gratings included therebetween jointly form the fiber grating group to determine the fiber grating code group.
Further preferably, the fiber grating code group is composed of a start-position fiber grating and an end-position fiber grating, and the fiber gratings composing the fiber grating code group have different wavelengths. The whole coding group has two flag bits, which are divided into a start bit and an end bit, and the coded digital information is recorded in the middle to form information bits.
Preferably, in the start-stop fiber grating, the wavelength of the start fiber grating is 1565nm, and the wavelength of the stop fiber grating is 1625 nm.
Preferably, the fiber grating used in the fiber grating code group is a reflection-type fiber grating and/or a transmission-type fiber grating.
Preferably, the fiber grating groups are lithographically printed at the same position; and/or
The fiber gratings in the fiber grating group are photoetched at different positions at intervals.
Preferably, the fiber grating group is linearly arranged with the same fiber; and
the fiber grating group is arranged on the main optical cable; and/or the fiber grating group is arranged on the branch light path.
Further preferably, when the fiber grating coding group is specifically formed, the fiber grating coding group can be linearly formed by adopting the same fiber; repeating etching at the same point; the branch line of the branching device is linearly formed; the branch lines of the branching device are repeatedly engraved at the same point;
the same-fiber linear composition is that a plurality of fiber gratings are manufactured on the optical fiber in series;
the same point is repeatedly etched, namely a plurality of fiber gratings are manufactured at the same position on the optical fiber;
the branch line linear composition of the splitter is that a light splitter is added on the optical fiber, and a plurality of fiber gratings are manufactured on the branches of the light splitter in series;
adding optical splitter on optical fiber by branch line same-point repeated etching, and making multiple fiber gratings at same position on branch of optical splitter
Preferably, in the fiber grating code group, the start bit and the end bit corresponding to the start-stop fiber grating respectively are flag bits, and the digital information of the code group is used between the start bit and the end bit.
Preferably, in the start-stop fiber grating, the wavelength of the start fiber grating is 1565.5nm, and the wavelength of the stop fiber grating is 1624.5 nm.
Preferably, the wavelength of the fiber grating code group is 1566.5nm to 1623.5 nm.
Preferably, in the fiber grating group, the wavelength of each fiber grating is A.5nm, wherein A is an integer part of the wavelength, and 1565nm is not less than A and not more than 1625. The stability and the recognition effect of the central wavelength of the fiber grating are better when A.5nm is adopted.
Preferably, the fiber grating code group is identified by an FBG demodulator.
Further preferably, when the FBG demodulator (fiber bragg grating demodulator) is used for wavelength detection, a wavelength intensity locking mode may be adopted, specifically, a stepping mode may be adopted, that is, an initial delay is set according to the set fiber bragg grating wavelength, and the delay is gradually changed according to a preset step length to perform wavelength test; or, according to the preset inherent wavelength of the fiber grating, starting from the minimum wavelength or the maximum wavelength, and according to the stored set wavelength length of the fiber grating, performing corresponding delay control one by one to realize the wavelength test.
Preferably, the interval between adjacent wavelengths in the fiber grating group is 1 nm.
Preferably, the distance of the starting fiber bragg grating in the starting and stopping fiber bragg gratings is detected, the distance is used as a coding element of the fiber bragg grating coding group, and the coding element is set as a mark bit; or
And taking the wavelength of the initial fiber grating in the fiber grating group as the identification bit of the fiber grating coding group, and taking the distance as one of the information bits of the coding group.
Preferably, the distance of each fiber grating in the fiber grating group is detected, each wavelength corresponding to the fiber grating meeting a preset distance range is used as a code element, and the code elements are sorted according to the distance to form a code group.
Preferably, the reflection energy difference of each fiber grating in the fiber grating group is detected, and the coding elements are sorted according to the reflection energy difference to form a coding group.
Specifically, the fiber grating code group identification method can adopt start-stop wavelength fiber gratings as identification wavelength code elements, can adopt fiber gratings in a distance range as code elements, can adopt distance lengths as code element sequencing, and can adopt reflection energy difference as code element sequencing. Namely, the center wavelength, the distance and the reflected energy can be used as the basis of the coding rule, so that the variables of three dimensions can be used, and the system capacity is expanded to the maximum extent.
Preferably, the fiber grating code groups identify the same wavelength, and corresponding wavelength offset can be performed in the manufacturing process of the fiber grating with the same central wavelength of each code group, so that the identification degree of the same central wavelength is improved.
Based on the technical scheme, the technical scheme of the invention has the following beneficial effects:
1. the unique identification of the optical fiber medium can be realized, and the optical fiber medium identification method is characterized in that optical fiber gratings with different wavelengths are utilized to form an optical fiber grating code group to form a unique label of the optical cable;
2. the identification capacity of the system can be increased by compositely utilizing the central wavelength, the emission energy and the distance of the fiber bragg grating;
3. and additional third-party identification equipment is not required to be added, and the cost is greatly saved under the condition of effectively improving the identification precision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a fiber grating code set according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the position of the fiber grating code set in the optical cable according to an embodiment of the present invention.
Wherein:
the labels in fig. 1 are: 11-optical cable, 12-optical fiber grating
The labels in fig. 2 are:
21-optical cable, 22-coupler, 23-branch fiber grating encoder and 24-main fiber grating encoder.
Detailed Description
An application program recommendation method and apparatus according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be appreciated by those of skill in the art that the following specific examples or embodiments are a series of presently preferred arrangements of the invention to further explain the principles of the invention, and that such arrangements may be used in conjunction or association with one another, unless it is expressly stated that some or all of the specific examples or embodiments are not in association or association with other examples or embodiments. Meanwhile, the following specific examples or embodiments are only provided as an optimized arrangement mode and are not to be understood as limiting the protection scope of the present invention.
Example 1:
in a specific embodiment, referring to fig. 1 and 2, the present invention provides a fiber grating code group identification method, where the method includes: the method comprises the steps that a plurality of fiber bragg gratings with different wavelengths are arranged in an optical cable to be identified to form a fiber bragg grating group, a fiber bragg grating coding group is formed through the plurality of wavelengths of the plurality of fiber bragg gratings, and coding elements of the fiber bragg grating coding group are formed through the wavelengths corresponding to the fiber bragg gratings adopted in the fiber bragg grating coding group; and identifying the optical cable by identifying the fiber bragg grating coding group.
In a specific embodiment, the wavelength λ of the fiber grating code groupiWith a communication wavelength λ in said optical cablekOrthogonal, that is, satisfying:
where n represents the number of center wavelengths of the total fiber grating.
In a specific embodiment, the wavelengths of the fiber grating code groups are in the L-band and U-band wavelength bands.
In a specific embodiment, the wavelength of the fiber grating code group adopts a wavelength in a wave band range from 1565nm to 1625 nm. The band fiber is less attenuated and is not used for communication service.
In a specific embodiment, fiber gratings with a fixed wavelength are respectively used as start-stop fiber gratings of the fiber grating code group, and the start-stop fiber gratings and the fiber gratings included therebetween jointly form the fiber grating group to determine the fiber grating code group.
Further preferably, the fiber grating code group is composed of a start-position fiber grating and an end-position fiber grating, and the fiber gratings composing the fiber grating code group have different wavelengths. The whole coding group has two flag bits, which are divided into a start bit and an end bit, and the coded digital information is recorded in the middle to form information bits.
In a specific embodiment, in the start-stop fiber grating, the wavelength of the start fiber grating is 1565nm, and the wavelength of the stop fiber grating is 1625 nm.
In a specific embodiment, the fiber grating used in the fiber grating code set is a reflective fiber grating and/or a transmissive fiber grating.
In a specific embodiment, the fiber grating groups are lithographically printed at the same position; and/or
The fiber gratings in the fiber grating group are photoetched at different positions at intervals.
In a specific embodiment, the fiber grating group is linearly arranged in the same fiber; and
the fiber grating group is arranged on the main optical cable; and/or the fiber grating group is arranged on the branch light path.
Further preferably, when the fiber grating coding group is specifically formed, the fiber grating coding group can be linearly formed by adopting the same fiber; repeating etching at the same point; the branch line of the branching device is linearly formed; the branch lines of the branching device are repeatedly engraved at the same point;
the same-fiber linear composition is that a plurality of fiber gratings are manufactured on the optical fiber in series;
the same point is repeatedly etched, namely a plurality of fiber gratings are manufactured at the same position on the optical fiber;
the branch line linear composition of the splitter is that a light splitter is added on the optical fiber, and a plurality of fiber gratings are manufactured on the branches of the light splitter in series;
the branch lines of the splitter are subjected to same-point repeated etching, namely, the optical splitter is added on the optical fiber, and a plurality of fiber gratings are manufactured at the same position on the branch of the optical splitter.
In a specific embodiment, in the fiber grating code group, the start bit and the end bit respectively corresponding to the start-stop fiber grating are flag bits, and the digital information of the code group is defined between the start bit and the end bit.
In a specific embodiment, in the start-stop fiber grating, the wavelength of the start-stop fiber grating is 1565.5nm, and the wavelength of the stop fiber grating is 1624.5 nm.
In a specific embodiment, the wavelength of the fiber grating code set is in the range of 1566.5nm to 1623.5 nm.
In a specific embodiment, in the fiber grating group, the wavelength of each fiber grating is A.5nm, wherein A is an integral part of the wavelength, and 1565nm is not less than A and not more than 1625. The stability and the recognition effect of the central wavelength of the fiber grating are better when A.5nm is adopted.
In a specific embodiment, the fiber bragg grating code group is identified by an FBG demodulator.
Further preferably, when the FBG demodulator (fiber bragg grating demodulator) is used for wavelength detection, a wavelength intensity locking mode may be adopted, specifically, a stepping mode may be adopted, that is, an initial delay is set according to the set fiber bragg grating wavelength, and the delay is gradually changed according to a preset step length to perform wavelength test; or, according to the preset inherent wavelength of the fiber grating, starting from the minimum wavelength or the maximum wavelength, and according to the stored set wavelength length of the fiber grating, performing corresponding delay control one by one to realize the wavelength test.
In a specific embodiment, the adjacent wavelengths in the fiber grating group are spaced by 1 nm.
In a specific embodiment, the distance of a starting fiber grating in the starting and stopping fiber gratings is detected, and the distance is used as a coding element of the fiber grating coding group and is set as a flag bit; or
And taking the wavelength of the initial fiber grating as an identification bit of a fiber grating coding group, and taking the distance as one of information bits of the coding group.
In a specific embodiment, the distance of each fiber grating in the fiber grating group is detected, each wavelength corresponding to the fiber grating satisfying a preset distance range is used as a code element, and the code elements are sorted according to the distance to form a code group.
In a specific embodiment, the difference of the reflection energy of each fiber grating in the fiber grating group is detected, and the coding elements are sorted according to the difference of the reflection energy to form a coding group.
In a specific embodiment, the plurality of fiber gratings with different wavelengths may be a plurality of identical or partially identical fiber gratings.
Specifically, the fiber grating code group identification method can adopt start-stop wavelength fiber gratings as identification wavelength code elements, can adopt fiber gratings in a distance range as code elements, can adopt distance lengths as code element sequencing, and can adopt reflection energy difference as code element sequencing. Namely, the center wavelength, the distance and the reflected energy can be used as the basis of the coding rule, so that the variables of three dimensions can be used, and the system capacity is expanded to the maximum extent.
In a specific embodiment, the fiber grating code groups identify the same wavelength, and the fiber grating code groups can adopt the fiber grating code groups with the same central wavelength to perform corresponding wavelength shift during the manufacturing process, so as to improve the identification degree of the same central wavelength.
Example 2:
in a specific embodiment, as shown in fig. 1, the fiber grating code group identification method provided by the present invention can be implemented in the following example manner:
the system comprises at least one optical fiber cable 11 and a fiber grating coding group 12.
Considering that the transmitted signal has a wavelength of C band, the wavelength range is 1530 and 1565 nm. In order to avoid influencing signal transmission, the central wavelength of the detection light source adopted by the system is 1565-1625 nm. The fiber grating code group 12 is an identification medium, the fiber grating adopted in the design adopts a scheme of five fiber gratings, the central wavelengths are 1565.5nm, 1566.5nm, 1567.5nm, 1568.5nm and 1625.5nm1565.5nm respectively, which are the start bits of the whole identification group, and 1625.5nm which is the stop bit of the whole identification group. Through calculation, in order to distinguish the positions of the fiber gratings, the interval of the gratings is 1 cm; the reflectivities of the middle three data bits are 90%, 85% and 80%, respectively, so that the reflectivities of the three fiber gratings can also be used as the basis for identification.
And the fiber grating code set can be placed in a manner as shown in figure 2,
in fig. 2, 21 is an optical cable, 22 is a coupler, the central optical fiber passes through 1550nm band, 23 is a branch encoding group 1, and a scheme of five fiber gratings is adopted, and the central wavelengths are 1568.5nm, 1569.5nm, 1570.5nm, 1571.5nm and 1572.5nm respectively.
24 is the main path coding group 2, which adopts the scheme of five fiber gratings, and the central wavelengths are 1565.5nm, 1566.5nm, 1567.5nm, 1568.5nm and 1625.5nm respectively.
Example 3:
the main principle of the invention is that the optical cable is identified by implanting the fiber bragg grating coding group in the optical cable and identifying the parameters of the fiber bragg grating coding group. As shown in fig. 1, which is a fiber grating coding group structure in a specific embodiment of the present invention, 11 is an optical cable, 12 is a plurality of fiber gratings with a pitch of L and U, and the wavelengths of the fiber gratings may be set to be different, may also be set to be the same or partially the same, as long as the coding mode can be implemented, and all of them may be applied to this embodiment. Specifically, the fiber grating code group is formed by implanting a single or multiple fiber gratings in the fiber core of the optical cable, where the fiber grating code group is a preferred embodiment, it should be understood by those skilled in the art that the fiber core of the optical cable, which can be implanted with a fiber grating, can be used as a fiber grating code group, and the fiber grating code group can be a device additionally added to the optical cable, for example, at the interface of a section of optical fiber, or can be formed by one or multiple fiber gratings written in the optical cable at the beginning of the production of the optical cable, that is, the fiber grating code group can be integrated with the optical cable at the beginning of the production, or can be formed by connecting an additional device to the optical cable, where the fiber grating code group can be embedded or connected into the fiber core of the optical cable to form any existing technology of reflected light without being limited by the above structure, are suitable for this and should be considered as falling within the scope of the present invention.
The fiber grating parameters concerned in the invention mainly include the following: the center wavelength lambda of the fiber grating, the position Z in the optical cable, the spatial distance L of the fiber grating and the reflection energy E of the fiber grating.
When the degrees of freedom of the variables are N (λ), N (Z), N (L), and N (E), the system capacity of the entire system is Ns：NsN (λ) × N (z) × N (l) × N (e). It is obvious from this that increasing the resolution of each dimension can effectively increase the capacity of the system, but the resolution of each dimension cannot be infinitely small, and is limited by many factors.
If the light energy distribution of the incident light is given by E (λ), this power is a function of the wavelength λ. a (lambda) is the loss coefficient of unit length of forward propagation, and the optical energy E (z, lambda) at the position z to be measured is as follows:
if the optical signal is reflected at the fiber grating at z, the optical energy of the fiber grating received by the input end is:
where E (λ) is the optical energy spectral density of the incident light, which can be adjusted according to the requirements of the system, e.g. from the light source design or filter design; a (x, λ)g) Loss coefficient per unit length of forward propagation, r (z, λ)g) Is the reflection coefficient, d (x, lambda) is the attenuation coefficient of unit length of the back scattering light, and the three parameters are all parameters related to wavelength and space position, and specific values can be referred to relevant documents in the prior art.
According to the equation (2), it can be seen that the energy signal received by the FBG demodulator is mainly affected by several factors:
1. influenced by the position Z of the test point, the farther the position distance of the test point is, the smaller the received signal is;
2. to E (lambda)g) The influence of (a), namely the influence of the light energy spectrum of the light source;
3. is a (x, lambda)g) And d (x, λ)g) In the usual case. This is mainly influenced by rayleigh scattering, which is wavelength dependent and whose intensity is inversely proportional to the fourth power of the incident wavelength;
4. when assuming E (λ)g) And under the condition that the transmission loss is unchanged, the signals received by the fiber gratings are approximately in an exponential relationship.
If the test is performed once every other delay period Δ t, which is equivalent to that n test points are distributed in the optical cable, and the distance between the test points is L, the positions of the test points are: ziiL. The time interval for which the test point reflected light energy is received at the FBG demodulator is:
n(λst) is a wavelength of λsThe refractive index at temperature T, i.e. the wavelength and temperature dependent effectAnd (6) sounding. Where C0 is the propagation velocity of light in vacuum, and is 3X 108m/s。
The reflected power of the ith test point can be calculated according to the above equation as:
(5) in the formulae (6) and (7), r (z, lambda), P (lambda), C0The definitions of a (x, λ) and d (x, λ) are the same as those of the formulae (2), (3) and (4).
Equation (6) is the phase-locked time difference when the ith fiber grating is measured. The position of the ith fiber grating can be deduced according to the formula (6), as shown in the formula (7). This is the position information that the invention resolves. The calculated fiber position L is shown in the formula (7)ciHas a relationship with several factors, one is tciI.e., the time of the test, one is the dispersion n (λ) of the fiber gratingi)。
Then, according to equation (7), the test error amount of the position of the ith fiber grating is:
the test error is therefore related here to two factors, dtciAnd dn (lambda)iT), and dn (λ)iT) is in turn associated with λiAnd temperature T. This illustrates the need to reduce the measurement time error of both optical switches at the time of testing to reduce dtciMeanwhile, the accuracy of the FBG demodulator needs to be improved. Meanwhile, the error amount calculated here is also related to the capacity of the system in the dimension, and in order to distinguish the positions of the two fiber gratings, the space taken by the two fiber gratings isThe spacing al should be much larger than the amount of error calculated here. Namely:
meanwhile, when equation (10) is satisfied, dL is shown in equation (8)ci＝0
That is, due to the existence of chromatic dispersion, the positions measured by the fiber gratings at different positions may coincide, so the present invention needs to consider this problem when designing the pitch of the fiber gratings, and meanwhile, the refractive index of the fiber is influenced by the propagation wavelength in the fiber grating and the distributed temperature, which is very easily influenced by the environment, so it is better not to get too small when selecting the pitch of the fiber gratings, otherwise, the distributed temperature is very easily influenced by the environment. From the calculation of equation (8), it is possible to estimate the wavelength range of the center of the fiber grating selected by the system, for example, from (λ)1To lambdan) Temperature from (T)1To Tn) Finding the maximum dL of this array as a series of data of test errors for two wavelengths within the range of (1)ci(max), then at cable grating spacing should be greater than dLci(max), that is:
ΔL＝max(dL1,dL2,···dLn)
in formula (11), dLiIs the measured error value calculated under the ith set of parameters.
In a specific embodiment, as shown in (4), the farther the distance, the weaker the electrical signal received by the fiber grating at the incident end. When the reflected signal of the fiber grating is equivalent to the scattered signal in the optical path and the electric signal, the reflected signal and the scattered signal cannot be detected. Therefore, to obtain higher signal strengthThe luminous power P of the light source needs to be increasedi(λ) to enhance the dynamic range of the FBG demodulator to obtain weak FBG wavelength reflections at longer distances. Therefore, the light emitting power and the dynamic range of the FBG demodulator need to be considered when considering the reflectivity of the fiber grating.
In one embodiment, it can be seen from (11) that the minimum spatial separation of the fiber gratings should be determined by the minimum fiber grating wavelength separation. For the 1cm interval adopted in this embodiment, the wavelength interval of the minimum fiber grating is about 1nm, so that when the system selects the central wavelength of the fiber grating, the wavelength with 0.5nm as the suffix is selected, and the interval is 1nm, which is also convenient for identification and storage.
However, how to store the identification information and the optical cable information in the database in a corresponding manner for searching and finding is implemented by a person skilled in the art by combining with a conventional method in the data processing field, for example, storing the identification information and the optical cable information in a one-to-one correspondence manner according to parameters, fiber gratings, optical cable names or optical cable numbers, or storing parameters of two or more fiber gratings in a one-to-one correspondence manner according to an optical cable name or an optical cable number, that is, a code formed by a plurality of fiber gratings corresponds to an optical cable or an optical fiber segment, and the like, which is not limited herein to the protection scope of the present invention.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
1. A fiber grating code group identification method is characterized by comprising the following steps:
the method comprises the steps that a plurality of fiber bragg gratings with different wavelengths are arranged in an optical cable to be identified to form a fiber bragg grating group, a fiber bragg grating coding group is formed through the plurality of wavelengths of the plurality of fiber bragg gratings, and coding elements of the fiber bragg grating coding group are formed through the wavelengths corresponding to the fiber bragg gratings adopted in the fiber bragg grating coding group; the optical cable is identified by identifying the fiber bragg grating coding group;
respectively taking a fiber grating with a fixed wavelength as a start-stop fiber grating of the fiber grating code group, and jointly forming the fiber grating group by the start-stop fiber grating and the fiber gratings contained between the start-stop fiber gratings so as to determine the fiber grating code group;
in the fiber bragg grating coding group, the start bit and the stop bit corresponding to the start-stop fiber bragg grating respectively are marker bits, and the digital information of the coding group is used between the start bit and the stop bit;
and detecting the distance of each fiber grating in the fiber grating group, taking each wavelength corresponding to the fiber grating meeting a preset distance range as a coding element, and sequencing the coding elements according to the distance to form a coding group.
2. The method of claim 1, wherein the fiber grating code set has a wavelength λiWith a communication wavelength λ in said optical cablekOrthogonal, that is, satisfying:
where n represents the number of center wavelengths of the total fiber grating.
3. The method according to claim 1 or 2, wherein the wavelengths of the fiber grating code groups are in L and U band wavelength bands, and/or,
the fiber grating adopted in the fiber grating coding group is a reflection type fiber grating and/or a transmission type fiber grating, and/or,
the wavelength of the fiber grating coding group adopts the wavelength within the wave band range of 1565nm to 1625 nm.
4. The method of claim 1, wherein the starting fiber grating has a wavelength of 1565nm and the terminating fiber grating has a wavelength of 1625 nm.
5. The method of claim 1, wherein the fiber grating groups are lithographically printed at a same location; and/or the presence of a gas in the gas,
the fiber gratings in the fiber grating group are photoetched at different positions at intervals.
6. The method of claim 1, wherein the fiber grating groups are arranged linearly with the same fiber.
7. The method of claim 1, wherein the fiber grating group is disposed on a main fiber cable; and/or the fiber grating group is arranged on the branch light path.
8. The method according to claim 1, wherein the distance of the starting fiber grating in the starting and ending fiber gratings is detected and used as a coding element of the fiber grating code set and set as the identification bit.
9. The method of claim 1, wherein in the fiber grating group, the wavelength of each fiber grating is A.5nm, wherein A is an integer part of the wavelength, and 1565nm A1625; or the interval between adjacent wavelengths in the fiber grating group is 1 nm.
10. The method according to claim 1, wherein the wavelength of the initial fiber grating in the fiber grating group is used as the identification bit of the fiber grating code group, and the distance is used as one of the information bits of the code group.
11. The method of claim 1, wherein the difference of the reflected energy of each fiber grating in the fiber grating group is detected, and the encoding elements are sorted according to the difference of the reflected energy to form an encoding group.
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| CN108592958A (en) * | 2018-04-18 | 2018-09-28 | 中山水木光华电子信息科技有限公司 | A kind of identifying system of the short distance optical fiber code of identical coding unit |
| CN108833001A (en) * | 2018-04-18 | 2018-11-16 | 中山水木光华电子信息科技有限公司 | A kind of optical fiber code identifying system based on tunable optical source |
| CN108534988B (en) * | 2018-04-18 | 2020-12-29 | 中山水木光华电子信息科技有限公司 | System for realizing optical fiber coding by using circulator |
| CN108534989A (en) * | 2018-04-18 | 2018-09-14 | 中山水木光华电子信息科技有限公司 | A kind of method of optical cable intelligent recognition |
| CN108880684B (en) * | 2018-05-22 | 2020-12-15 | 中山水木光华电子信息科技有限公司 | All-optical recognition and operation method based on optical fiber coding |
| CN108759911A (en) * | 2018-05-22 | 2018-11-06 | 中山水木光华电子信息科技有限公司 | A kind of component optics unique identification and operational monitoring method based on optical fiber code |
| CN108810673B (en) * | 2018-05-22 | 2021-02-19 | 中山水木光华电子信息科技有限公司 | Optical fiber channel automatic selection method based on optical fiber coding |
| CN109347546B (en) * | 2018-11-01 | 2021-09-10 | 中国电力科学研究院有限公司 | Method for diagnosing optical cable fault |
| CN110057385B (en) * | 2019-04-10 | 2023-11-21 | 中山水木光华电子信息科技有限公司 | Identification system based on optical fiber multilayer reflecting surface combination coding |
| CN110048768B (en) * | 2019-04-28 | 2023-11-21 | 中山水木光华电子信息科技有限公司 | Identification system and identification method for same-wavelength optical fiber coding group |
| CN110474678B (en) * | 2019-08-22 | 2021-06-01 | 华为技术有限公司 | Method and system for acquiring optical fiber code and related equipment |
| CN111665520B (en) * | 2020-06-24 | 2023-09-29 | 中山水木光华电子信息科技有限公司 | Identification system, method, device and storage medium |
| CN113411694B (en) * | 2021-06-28 | 2023-07-18 | 中山水木光华电子信息科技有限公司 | Communication method and system with identification code and information code |
| CN113411695B (en) * | 2021-06-28 | 2023-07-18 | 中山水木光华电子信息科技有限公司 | Communication method and system with optical cable identification code and information code |
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