CN115327698B - Optical fiber grating inscription method, device, computer equipment and medium - Google Patents
Optical fiber grating inscription method, device, computer equipment and medium Download PDFInfo
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- CN115327698B CN115327698B CN202210991251.5A CN202210991251A CN115327698B CN 115327698 B CN115327698 B CN 115327698B CN 202210991251 A CN202210991251 A CN 202210991251A CN 115327698 B CN115327698 B CN 115327698B
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B2006/02166—Methods of designing the gratings, i.e. calculating the structure, e.g. algorithms, numerical methods
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Abstract
The invention discloses a method, a device, computer equipment and a medium for inscribing fiber gratings, wherein the method for inscribing fiber gratings comprises the following steps: writing a reference fiber grating with known parameters on the optical fiber; acquiring a first reflection spectrum of a reference fiber bragg grating, and determining a second reflection spectrum of a target fiber bragg grating according to the first reflection spectrum and preset parameters of the target fiber bragg grating; monitoring the reflection spectrum of the optical fiber, and inscribing a target fiber bragg grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value; and removing the reference fiber grating to obtain the target fiber grating. According to the method, firstly, the reference fiber grating is inscribed on the optical fiber, then the second reflection spectrum of the target fiber grating is determined based on the first reference spectrum of the reference fiber grating, and the target fiber grating is inscribed and monitored based on the fact that the difference of peaks among the spectrums reaches a preset value. And the target fiber bragg grating is ensured to be monitored, and meanwhile, the target fiber bragg grating under accurate preset parameters is ensured to be inscribed.
Description
Technical Field
The present invention relates to the field of optical fiber grating writing technology, and in particular, to a method, an apparatus, a computer device, and a medium for writing an optical fiber grating.
Background
Fiber gratings are an important passive optical device. The diffraction grating is formed by axially and periodically modulating the refractive index of an optical fiber core by a certain method. The fiber bragg grating has the advantages of small volume, small welding loss, full compatibility with optical fibers and the like, and is widely applied to the fields of optical fiber communication, optical fiber lasers, optical fiber sensing and the like.
In some applications, fiber gratings with very low reflectivity are often used. For example, some fiber grating sensor systems require low reflection fiber gratings around 1%, gratings for semiconductor laser pumping wavelength locking require reflectivity between 3% -5%, etc. It is therefore important to be able to accurately write a low reflection grating of a given reflectivity. But accurately controlling the reflectivity of the low-reflectivity grating is a difficult problem.
Disclosure of Invention
In view of this, the embodiments of the present invention provide a method, an apparatus, a computer device, and a medium for writing an optical fiber grating, which are used for ensuring that the target optical fiber grating is accurately written under preset parameters while ensuring the monitoring of the target optical fiber grating.
In a first aspect, an embodiment of the present invention provides a method for writing an optical fiber grating, including:
writing a reference fiber grating with known parameters on the optical fiber;
acquiring a first reflection spectrum of the reference fiber bragg grating, and determining a second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum and preset parameters of the target fiber bragg grating;
monitoring the reflection spectrum of the optical fiber, and inscribing the target fiber bragg grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value;
and removing the reference fiber grating to obtain the target fiber grating.
In a second aspect, an apparatus for writing an optical fiber grating according to an embodiment of the present invention includes:
the reference fiber grating writing module is used for writing a reference fiber grating with known parameters on the optical fiber;
the second reflection spectrum determining module is used for determining a second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum of the reference fiber bragg grating and preset parameters of the target fiber bragg grating;
the reflection spectrum monitoring module is used for monitoring the reflection spectrum of the optical fiber, and writing the target fiber bragg grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value;
and the target fiber bragg grating acquisition module is used for removing the reference fiber bragg grating and acquiring the target fiber bragg grating.
In a third aspect, an embodiment of the present invention provides a computer apparatus, including:
one or more processors;
storage means for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of inscribing a fiber grating as described in any of the first aspects.
In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, on which a computer program is stored, where the program is executed by a processor to implement a method for writing a fiber bragg grating according to any one of the first aspects.
The embodiment of the invention provides a method for inscribing an optical fiber grating, which comprises the steps of inscribing a reference optical fiber grating with known parameters on an optical fiber, determining a second reflection spectrum of a target optical fiber grating based on a first reference spectrum of the reference optical fiber grating, and synchronously monitoring the optical fiber grating on the basis that the difference of peaks between the spectrums reaches a preset value when inscribing the target optical fiber grating on the optical fiber. The method solves the problems that in the prior art, when preset parameters of the target fiber grating are finer, the error of the inscribed target fiber grating is larger and the monitoring effect is inaccurate. The method for inscribing the fiber bragg grating provided by the embodiment of the invention ensures the inscribing of the target fiber bragg grating under the accurate preset parameters while ensuring the monitoring of the target fiber bragg grating, and solves the problem that the monitoring and inscribing errors are generated due to finer preset parameters of the target fiber bragg grating in the prior art.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a flowchart of a method for writing an optical fiber grating according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for writing an optical fiber grating according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a writing platform according to a second embodiment of the present invention;
FIG. 4 is a transmission spectrum of a reference fiber grating according to a second embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another writing platform according to a second embodiment of the present invention;
FIG. 6 is a reflection spectrum of a reference fiber grating according to a second embodiment of the present invention;
FIG. 7 is a reflection spectrum of a target reference fiber grating according to a second embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a writing device for fiber gratings according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a computer device according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be fully described below by way of specific embodiments with reference to the accompanying drawings in the examples of the present invention. It is apparent that the described embodiments are some, but not all, embodiments of the present invention, and that all other embodiments, which a person of ordinary skill in the art would obtain without making inventive efforts, are within the scope of this invention.
In the prior art, the writing method of the fiber grating with lower reflectivity or ultralow reflectivity is the same as that of other types of fiber gratings, and a phase mask method can be adopted, but the technical difficulty is how to monitor in real time during the grating writing process, accurately control the exposure time, and write the low-reflectivity fiber grating with the required reflectivity.
The current method for measuring the reflectivity of the fiber bragg grating mainly comprises 2 steps:
the first method is as follows: and measuring by using a transmission spectrum of the fiber bragg grating. The broadband light source is connected with one end of the fiber bragg grating, and the other end is connected with the spectrometer. And scanning once to obtain the transmission spectrum of the fiber bragg grating. The reflectivity of the grating is calculated according to the depth of the central position of the transmission spectrum grating. This method tends to have a large error in measuring ultra-low reflectivity gratings. For example, the central depth of the transmission spectrum of the low reflection grating with the reflectivity of 5% is only 0.22db, and the power jitter of the broadband light source can cause about 0.1db error once, so that the reflectivity judgment of the low reflection grating is greatly influenced. The grating used in the fiber laser is basically a double-cladding fiber with large core diameter, multiple modes exist in the fiber, the higher-order mode part cannot be reflected by the grating, and the low reflection grating reflectivity test result is smaller than the actual result.
The second method is as follows: and measuring by using a reflection spectrum of the fiber bragg grating. The reflectivity of the fiber bragg grating is judged according to the ratio of the optical power reflected by the grating to the power injected by the port. The method firstly needs a proper narrow-band light source, and in addition, the reflectivity of the low-reflection fiber grating is very low, and a little power loss can cause great error between the calculated reflectivity of the grating and the actual written reflectivity.
In order to solve the technical problems, the embodiment of the invention provides a method for inscribing an optical fiber grating, which comprises the steps of inscribing a reference optical fiber grating with known parameters on an optical fiber; secondly, a first reflection spectrum of the reference fiber bragg grating is obtained, and a second reflection spectrum of the target fiber bragg grating is determined according to the first reflection spectrum and preset parameters of the target fiber bragg grating; then monitoring the reflection spectrum of the optical fiber, and inscribing a target optical fiber grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value; and finally, removing the reference fiber grating to obtain the target fiber grating. The method for inscribing the fiber bragg grating provided by the embodiment of the invention ensures the target fiber bragg grating under accurate preset parameters while ensuring the monitoring of the target fiber bragg grating, and solves the problem that in the prior art, the monitoring and inscribing errors are generated due to finer preset parameters of the target fiber bragg grating.
Example 1
Fig. 1 is a flowchart of a method for writing an optical fiber grating according to an embodiment of the present invention, and referring to fig. 1, the method may be applicable to an apparatus for writing an optical fiber grating, and the method may be performed by the optical fiber grating writing apparatus according to the embodiment of the present invention, where the apparatus may be implemented by software and/or hardware, and the method includes the following steps:
s110, inscribing a reference fiber bragg grating with known parameters on the fiber.
The optical fiber is a short-term optical fiber, is made of glass or plastic, and can be used as a light conduction tool. The optical fiber grating is a diffraction grating formed by axially and periodically modulating the refractive index of an optical fiber core by a inscription method, and is a passive filter device. In the process of inscription, different fiber gratings are prepared by combining different requirements of the fiber gratings such as the center wavelength, the reflectivity and the like. Illustratively, the optical fiber grating is written on the optical fiber by a phase mask method, that is, the optical fiber is exposed by utilizing interference light formed by diffracted light after ultraviolet light passes through the phase mask plate, so that the refractive index of the fiber core is periodically changed, and the grating is written.
Specifically, the reference fiber grating with known parameters is inscribed on the optical fiber and used for the subsequent preparation of the target fiber grating for reference contrast, so that the error of inscribing and monitoring the target fiber grating can be reduced, and the inscription accuracy of the target fiber grating is improved.
S120, acquiring a first reflection spectrum of the reference fiber bragg grating, and determining a second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum and preset parameters of the target fiber bragg grating.
The method comprises the steps of monitoring a reference fiber bragg grating inscribed on an optical fiber and obtaining a first reflection spectrum of the reference fiber bragg grating. The first reflection spectrum may be obtained by connecting a reference fiber grating inscribed on the optical fiber with a spectrometer, reflecting the first reflection spectrum information by the spectrometer, and the position of the reflection peak of the reference grating and the peak value of the reflection peak may be obtained in the first reflection spectrum. Further, based on the difference between the known parameters of the reference fiber grating and the preset parameters of the target fiber grating, the second reflection spectrum of the target fiber grating can be determined on the first reflection spectrum, namely when the target fiber grating is not inscribed, the spectrum information which should be fed back in the inscription monitoring process is acquired, so that the inscription accuracy is improved under the existing monitoring standard in the inscription monitoring process of the target fiber grating.
Optionally, the known parameters of the reference fiber grating when writing include: the center wavelength of the reference fiber grating is a first wavelength, and the reflectivity of the reference fiber grating is a first reflectivity; the preset parameters for inscribing the target fiber bragg grating comprise: the center wavelength of the target fiber grating is a second wavelength, and the reflectivity of the target fiber grating is a second reflectivity; wherein the first wavelength is lambda 1, the second wavelength is lambda 2, |lambda 1-lambda 2| is less than or equal to 2nm; the first reflectivity is P1, the second reflectivity is P2, and P2 is less than P1.
Specifically, when the optical fiber is used for writing the optical fiber grating, different phase mask plates are utilized to generate the optical fiber grating with different center wavelengths, and different ultraviolet rays are adopted to generate the optical fiber grating with different reflectivities. Further, the first wavelength λ1 under the known parameters and the second wavelength λ2 under the preset parameters satisfy |λ1- λ2|less than or equal to 2nm, that is, the first wavelength λ1 and the second wavelength are similar, the first wavelength λ1 may be slightly larger than the second wavelength and be slightly smaller than the second wavelength and be equal to or smaller than 2nm, and the difference between the two center wavelengths is not specifically limited in the embodiment of the invention. The peak positions of the first reflection spectrum and the second reflection spectrum obtained through the spectrometer represent the center wavelength of the first reflection spectrum and the second reflection spectrum, namely when the center wavelength of the reference fiber grating is similar to the center wavelength under the target fiber grating, the difference between the first reflection spectrum and the second reflection spectrum is smaller, the error of determining the second reflection spectrum of the target fiber grating on the first reflection spectrum is reduced, and the writing accuracy of the target fiber grating is improved.
Further, the first reflectivity P1 under the known parameters is greater than the second reflectivity P2 under the preset parameters, that is, when the target fiber bragg grating with smaller reflectivity is prepared, especially when the fiber bragg grating with ultra-low reflectivity is prepared, the error is larger during writing and monitoring, and the specific numerical value of the fiber bragg grating is not limited by the embodiment of the invention. The reflectivity of the reference fiber bragg grating is larger, namely the writing precision of the reference fiber bragg grating is not affected by errors during writing and monitoring. According to the embodiment of the invention, the target fiber grating is inscribed on the basis of the reference fiber grating with smaller inscription error, so that the problem of poor accuracy of inscription of the fiber grating under low reflectivity in the prior art is solved, the fiber grating with low reflectivity or ultralow reflectivity can be inscribed by adopting the arrangement of inscribing the fiber grating with conventional reflectivity, the cost of instruments and processes is reduced, and the prepared fiber grating with low reflectivity or ultralow reflectivity can increase the capacity of an optical system.
S130, monitoring the reflection spectrum of the optical fiber, and inscribing a target optical fiber grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value.
Specifically, the reference optical fiber is inscribed on the optical fiber, and the feedback spectrum comprises a first reflection spectrum when the optical fiber is monitored. Further, the second reflection spectrum is determined by combining the difference between the known parameter of the reference fiber grating and the preset parameter of the target fiber grating on the basis of the first reflection spectrum, that is, the preset value of the peak difference value reflected by the first reflection spectrum and the peak difference value reflected by the second reflection spectrum can be further determined.
Further, when detecting an optical fiber including a reference fiber grating, the writing of the target fiber grating is also performed at the optical fiber position where the reference fiber grating is not written. And when the target fiber grating is inscribed, the optical fiber is monitored at the same time, and a reflection spectrum is obtained, wherein the reflection spectrum at the moment comprises a first reflection spectrum and a second reflection spectrum combined with inscription progress feedback. Based on the known preset value of the peak difference value reflected by the first reflection spectrum and the peak difference value reflected by the second reflection spectrum, the reflection spectrum fed back by the inscription target fiber grating is ensured to conform to the difference of the preset value under the peak difference value reflected by the first reflection spectrum, namely conforms to the peak difference reflected by the second reflection spectrum, the inscription target fiber grating is ensured to meet preset parameters, and the inscription accuracy of the target fiber grating is improved through real-time monitoring.
Optionally, monitoring the reflection spectrum of the optical fiber, and writing a target fiber grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a first preset value, wherein the first preset value is larger than the preset value.
Further, after the optical fiber is written with the optical fiber grating, annealing and dehydrogenation treatment is performed, namely, hydrogen in the optical fiber is removed. However, the reflectivity of the fiber bragg grating can be reduced through the dehydrogenation process, namely, when the target fiber bragg grating under the preset parameters is inscribed, the preset value of the fiber bragg grating can be increased in a proper amount, namely, the first preset value is larger than the preset value, and the reflectivity of the target fiber bragg grating inscribed under the first preset value is slightly larger than the second reflectivity under the preset parameters, but after annealing treatment, the obtained reflectivity can be reduced to the second reflectivity, namely, the target fiber bragg grating under the preset parameters is obtained. The second reflectivity of the preset parameters of the target fiber grating is 3%, but the condition that the reflectivity of the fiber grating is reduced due to annealing can be considered in the actual process, when the target fiber grating is inscribed, the preset value is improved by detecting the reflection spectrum of the target fiber grating, the target fiber grating with the reflectivity of 4% is obtained, and then the reflectivity is reduced to reach the second reflectivity through subsequent dehydrogenation treatment, so that the target fiber grating meeting the preset parameters is prepared.
S140, removing the reference fiber grating to obtain the target fiber grating.
Further, the optical fiber after inscription comprises a reference optical fiber grating and a target optical fiber grating, the reference optical fiber grating is cut for obtaining the target optical fiber grating, and the target optical fiber grating is ensured to be reserved on the optical fiber, so that inscription of the target optical fiber grating is completed.
In summary, according to the method for writing the fiber grating provided by the embodiment of the invention, the reference fiber grating with known parameters is written on the fiber, the second reflection spectrum of the target fiber grating is determined based on the first reference spectrum of the reference fiber grating, and when the target fiber grating is written on the fiber, synchronous monitoring is performed based on the fact that the difference between peaks of the spectrums reaches a preset value. The method solves the problems that in the prior art, when preset parameters of the target fiber grating are finer, the error of the inscribed target fiber grating is larger and the monitoring effect is inaccurate. The method for inscribing the fiber bragg grating provided by the embodiment of the invention ensures the target fiber bragg grating under accurate preset parameters while ensuring the monitoring of the target fiber bragg grating, and solves the problem that the preset parameters of the target fiber bragg grating are finer in the prior art.
Example two
Fig. 2 is a flowchart of a writing method of a fiber grating according to a second embodiment of the present invention, fig. 3 is a schematic structural diagram of a writing platform according to a second embodiment of the present invention, fig. 4 is a schematic structural diagram of a reference fiber grating according to a second embodiment of the present invention, fig. 5 is a schematic structural diagram of another writing platform according to a second embodiment of the present invention, fig. 6 is a reflection spectrum of a reference fiber grating according to a second embodiment of the present invention, fig. 7 is a reflection spectrum of a target reference fiber grating according to a second embodiment of the present invention, and details of how to accurately write the target fiber grating are detailed based on the above embodiments are shown in fig. 2 to 7. In this embodiment, the method specifically includes the following steps:
s210, placing the optical fiber to be inscribed on a grating inscription platform.
The optical fiber is inscribed on the grating inscribing platform, and referring to fig. 3, ultraviolet light emitted by the first ultraviolet laser 110 is transmitted to the first phase mask plate 310 through the first reflector 210, so as to inscribe the reference optical fiber grating 410. The writing of the reference fiber grating 410 under the first reflectivity is realized by the ultraviolet light emitted by the first ultraviolet laser 110, and the writing of the reference fiber grating 410 under the first wavelength is realized by the first phase mask 310.
S220, connecting one end of the optical fiber with a spectrometer and the other end with a broadband light source.
Furthermore, when the reference fiber grating is inscribed, the real-time monitoring of the reference fiber grating is realized by respectively connecting the spectrometer and the broadband light source at the two ends of the optical fiber. Illustratively, referring to FIG. 3, an optical fiber 400 is connected at one end to a broadband light source 510, the other end of the optical fiber 400 is connected to a spectrometer 610, and the optical fiber 400 includes a reference fiber grating 410 being written.
And S230, executing grating inscription, and monitoring the transmission spectrum of the grating by utilizing a spectrometer to obtain the reference fiber grating.
Specifically, when the optical fiber is inscribed, the transmission spectrum of the grating is monitored through a spectrometer, so that the accurate reference grating optical fiber is inscribed. Illustratively, referring to FIG. 4, a transmission spectrum of the reference fiber grating reflects the transmission peak of the reference fiber grating at known parameters, i.e., point A in FIG. 4. Illustratively, when the second reflectivity of the target fiber grating is 3%, the first reflectivity of the reference fiber grating may be 20% to 50%, and its corresponding transmission peak intensity is 0.97db to 3db.
S240, connecting the first end of the circulator with a broadband light source, the second end of the circulator with an optical fiber, and the third end of the circulator with a spectrometer.
S250, controlling a spectrometer to acquire a first reflection spectrum of the reference fiber grating.
Further, after the reference fiber grating is written, the optical fiber including the reference fiber grating is subjected to reflection spectrum acquisition. Specifically, referring to fig. 5, a first end of a circulator 700 is connected to a broadband light source 520, a second end of the circulator 700 is connected to an optical fiber 400, and a third end of the circulator 700 is connected to a spectrometer 620. The circulator 700 is a multi-port device that transmits an incident wave entering any one port thereof to the next port in order of direction determined by the static bias magnetic field. The optical fiber 400 includes the reference fiber grating 410, and the reflection spectrum of the reference fiber grating 410 in the optical fiber 400 can be fed back through the spectrometer 620 connected to the third end of the circulator 700. Referring to fig. 5, the reflection spectrum of the reference fiber grating reflects the reflection peak of the reference fiber grating under known parameters, i.e., point B in fig. 5.
And S260, determining a second reflection spectrum of the target fiber grating according to the first reflection spectrum and preset parameters of the target fiber grating.
Specifically, the second reflection spectrum of the target fiber grating may be determined on the first reflection spectrum based on a difference between the known parameter of the reference fiber grating and the preset parameter of the target fiber grating.
Optionally, the reflectivity of the reference fiber bragg grating is a first reflectivity P1, the reflectivity of the target fiber bragg grating is a second reflectivity P2, and the second reflection spectrum may be calculated and obtained according to a calculation formula:
wherein, the calculation formula:
H1-H2＝10lg(P1/P2)
wherein H1 is the peak value of the first reflection spectrum, H2 is the peak value of the second reflection spectrum, P1 is the first reflectance and P2 is the second reflectance. The difference between H1 and H2, namely DeltaH, is the peak difference, namely the reflectivity peak of the monitoring reference fiber grating and the reflectivity peak of the target fiber grating.
The second reflection spectrum is determined according to the peak difference value, and for example, if the first reflectivity is 20% and the second reflectivity is 3%, H1-h2=8.23 db can be obtained through the above calculation formula, and specific numerical values of the second reflection spectrum are not specifically limited in the embodiment of the present invention. Based on consideration of the annealing process of the fiber grating, in the case that the preset peak value is 8.23, the first preset peak value is adjusted to 8.25 specifically, referring to fig. 7, a second reflection spectrum is determined in the first reflection spectrum based on the acquired peak value difference, S1 in fig. 7 is the second reflection spectrum of the reference fiber grating, and S1 determines, by the peak value difference Δh, the second reflection spectrum of the target fiber grating in S2 in fig. 7. And referring to fig. 7, the difference between the center wavelengths of the reference fiber grating and the target fiber grating is small, so that the error in determining the second reflection spectrum is reduced.
S270, placing the optical fiber to be inscribed on a grating inscription platform.
The optical fiber is inscribed on the grating inscribing platform, and referring to fig. 5, ultraviolet light emitted by the second ultraviolet laser 120 is transmitted to the second phase mask plate 320 through the second reflector 220, so as to inscribe the target optical fiber grating 420. The writing of the target fiber grating 420 under the second reflectivity is realized by the ultraviolet light emitted by the second ultraviolet laser 120, and the writing of the target fiber grating 420 under the second wavelength is realized by the second phase mask 320.
For example, referring to fig. 5, the reference fiber grating 410 inscribed in the optical fiber 400 is on the side of the target fiber grating 420 close to the circulator 700, and the reference fiber grating may also be on the side of the target fiber grating far from the circulator (this is not specifically shown in the drawing), that is, the positional relationship between the reference fiber grating and the target fiber grating is not specifically limited in the embodiment of the present invention.
S280, connecting the first end of the circulator with a broadband light source, the second end of the circulator with an optical fiber, and the third end of the circulator with a spectrometer.
And S290, performing grating inscription, and monitoring the reflection spectrum of the grating by utilizing a spectrometer until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value.
Furthermore, the target fiber grating is inscribed and monitored in real time by a spectrometer connected with the circulator. Illustratively, referring to FIG. 5, a circulator 700 is connected at a first end to a broadband light source 520, a second end of the circulator 700 is connected to an optical fiber 400, and a third end of the circulator 700 is connected to a spectrometer 620. Specifically, when the target fiber grating is inscribed, the spectrometer feeds back the reflection spectrum, namely, when the target fiber grating is inscribed, the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum needs to reach a preset value, and referring to fig. 7, the target fiber grating under accurate preset parameters is inscribed while the monitoring of the target fiber grating is ensured, and the problem that the preset parameters of the target fiber grating are finer in the prior art is solved.
And S2100, removing the reference fiber grating to obtain the target fiber grating.
In summary, the embodiment of the invention provides a method for inscribing a fiber bragg grating, which further describes inscribing a target fiber bragg grating by referring to the fiber bragg grating, namely, the method ensures the inscribing of the target fiber bragg grating under accurate preset parameters while ensuring the monitoring of the target fiber bragg grating, and solves the problem that the preset parameters of the target fiber bragg grating are finer in the prior art.
Example III
Fig. 8 is a schematic structural diagram of a writing device for fiber grating according to a third embodiment of the present invention, where the device may be suitable for a product for writing fiber grating, and the device may be implemented by software and/or hardware.
As shown in fig. 8, the optical fiber grating inscription device 1 includes a reference optical fiber grating inscription module 10, a second reflection spectrum determination module 20, a reflection spectrum monitoring module 30, and a target optical fiber grating acquisition module 40.
A reference fiber grating writing module 10 for writing a reference fiber grating with known parameters on an optical fiber.
The second reflection spectrum determining module 20 is configured to determine a second reflection spectrum of the target fiber grating according to the first reflection spectrum of the reference fiber grating and preset parameters of the target fiber grating.
The reflection spectrum monitoring module 30 is configured to monitor a reflection spectrum of the optical fiber, and inscribe a target fiber bragg grating on the optical fiber until a difference between a peak value of the first reflection spectrum and a peak value of the second reflection spectrum reaches a preset value.
The target fiber grating acquisition module 40 is configured to remove the reference fiber grating and acquire the target fiber grating.
In summary, the embodiment of the invention provides a device for writing an optical fiber grating, which is used for writing a reference optical fiber grating with known parameters on an optical fiber through a reference optical fiber grating writing module; the second reflection spectrum determining module is used for obtaining a first reflection spectrum of the reference fiber bragg grating and determining a second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum and preset parameters of the target fiber bragg grating; secondly, a reflection spectrum monitoring module is used for monitoring the reflection spectrum of the optical fiber, and a target fiber grating is inscribed on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value; and finally, the target fiber grating acquisition module is used for removing the reference fiber grating to acquire the target fiber grating, namely, the target fiber grating under accurate preset parameters is ensured to be inscribed while the monitoring of the target fiber grating is ensured, and the problem that the preset parameters of the target fiber grating are finer in the prior art is solved.
Example IV
Fig. 9 is a schematic structural diagram of a computer device according to a fourth embodiment of the present invention, where, as shown in fig. 9, the computer device according to the embodiment of the present invention includes: one or more processors 41 and a storage device 42; the number of processors 41 in the device may be one or more, one processor 41 being taken as an example in fig. 7; the storage device 42 is used for storing one or more programs; the one or more programs are executed by the one or more processors 41, so that the one or more processors 41 implement a method for inscribing a fiber grating according to any one of the embodiments of the present invention.
The processor 41, the storage means 42, the input means 43 and the output means 44 in the device may be connected by a bus or by other means, in fig. 9 by way of example.
The storage device 42 in the apparatus is used as a computer readable storage medium, and may be used to store one or more programs, which may be software programs, computer executable programs, and modules, corresponding to the control method of the black start mode according to the embodiment of the present invention (for example, the writing device 1 of the fiber grating shown in fig. 8 includes the reference fiber grating writing module 10, the second reflection spectrum determining module 20, the reflection spectrum monitoring module 30, and the target fiber grating obtaining module 40). The processor 41 executes various functional applications and data processing of the terminal device by running software programs, instructions and modules stored in the storage device 42, that is, implements the method for writing the fiber grating in the above-described method embodiment.
The storage device 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the device, etc. In addition, the storage 42 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, storage 42 may further include memory located remotely from processor 41, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input means 43 may be used to receive entered numeric or character information and to generate key signal inputs related to user settings and function control of the device. The output device 44 may include a display device such as a display screen.
And, when one or more programs included in the above-described apparatus are executed by the one or more processors 41, the programs perform the following operations: writing a reference fiber grating with known parameters on the optical fiber; acquiring a first reflection spectrum of a reference fiber bragg grating, and determining a second reflection spectrum of a target fiber bragg grating according to the first reflection spectrum and preset parameters of the target fiber bragg grating; monitoring the reflection spectrum of the optical fiber, and inscribing a target fiber bragg grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value; and removing the reference fiber grating to obtain the target fiber grating.
Example five
A fifth embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program for executing a writing method of a fiber bragg grating when executed by a processor, the method comprising: writing a reference fiber grating with known parameters on the optical fiber; acquiring a first reflection spectrum of a reference fiber bragg grating, and determining a second reflection spectrum of a target fiber bragg grating according to the first reflection spectrum and preset parameters of the target fiber bragg grating; monitoring the reflection spectrum of the optical fiber, and inscribing a target fiber bragg grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value; and removing the reference fiber grating to obtain the target fiber grating.
Optionally, the program may be further configured to perform the method for writing the fiber grating provided by any of the embodiments of the present invention when executed by the processor.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access Memory (Random Access Memory, RAM), a Read-Only Memory (ROM), an erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to: electromagnetic signals, optical signals, or any suitable combination of the preceding. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, radio frequency (RadioFrequency, RF), and the like, or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. A method of writing a fiber grating, comprising:
writing a reference fiber grating with known parameters on the optical fiber;
acquiring a first reflection spectrum of the reference fiber bragg grating, and determining a second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum and preset parameters of the target fiber bragg grating;
monitoring the reflection spectrum of the optical fiber, and inscribing the target fiber bragg grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value;
removing the reference fiber grating to obtain the target fiber grating;
the method for determining the second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum and the preset parameters of the target fiber bragg grating comprises the following steps:
connecting a first end of a circulator with a broadband light source, a second end of the circulator with the optical fiber, and a third end of the circulator with a spectrometer;
controlling the spectrometer to acquire a first reflection spectrum of the reference fiber grating;
determining a second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum and preset parameters of the target fiber bragg grating;
the reflectivity of the reference fiber grating is the first reflectivity, and the reflectivity of the target fiber grating is the second reflectivity;
wherein determining the second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum and the preset parameters of the target fiber bragg grating comprises:
calculating and acquiring the second reflection spectrum according to a calculation formula:
wherein, the calculation formula:
H1-H2=10lg（P1/P2）
wherein H1 is the peak value of the first reflection spectrum, H2 is the peak value of the second reflection spectrum, P1 is the first reflectivity and P2 is the second reflectivity;
and determining the second reflection spectrum according to the difference value of the peak values.
2. The method of writing according to claim 1, wherein,
the known parameters include: the center wavelength of the reference fiber bragg grating is a first wavelength, and the reflectivity of the reference fiber bragg grating is a first reflectivity;
the preset parameters include: the center wavelength of the target fiber grating is a second wavelength, and the reflectivity of the target fiber grating is a second reflectivity;
wherein the first wavelength is lambda 1, the second wavelength is lambda 2, |lambda 1-lambda 2| is less than or equal to 2nm; the first reflectivity is P1, and the second reflectivity is P2, wherein P2 is less than P1.
3. The method of writing according to claim 1, wherein writing a reference fiber grating of known parameters on the fiber comprises:
placing the optical fiber to be inscribed on a grating inscription platform;
one end of the optical fiber is connected with a spectrometer, and the other end is connected with a broadband light source;
and executing grating inscription, and monitoring the transmission spectrum of the grating by using the spectrometer to obtain the reference fiber grating.
4. The writing method according to claim 1, wherein monitoring the reflection spectrum of the optical fiber, writing the target fiber grating on the optical fiber until a difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value, comprises:
placing the optical fiber to be inscribed on a grating inscription platform;
connecting a first end of a circulator with a broadband light source, a second end of the circulator with the optical fiber, and a third end of the circulator with a spectrometer;
and executing grating inscription, and monitoring the reflection spectrum of the grating by using the spectrometer until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value.
5. The writing method according to claim 1, wherein monitoring the reflection spectrum of the optical fiber, writing the target fiber grating on the optical fiber until a difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value, comprises:
and monitoring the reflection spectrum of the optical fiber, and inscribing the target fiber bragg grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a first preset value, wherein the first preset value is larger than the preset value.
6. A writing apparatus for an optical fiber grating, employing the method for writing an optical fiber grating according to claim 1, comprising:
the reference fiber grating writing module is used for writing a reference fiber grating with known parameters on the optical fiber;
the second reflection spectrum determining module is used for determining a second reflection spectrum of the target fiber bragg grating according to the first reflection spectrum of the reference fiber bragg grating and preset parameters of the target fiber bragg grating;
the reflection spectrum monitoring module is used for monitoring the reflection spectrum of the optical fiber, and writing the target fiber bragg grating on the optical fiber until the difference between the peak value of the first reflection spectrum and the peak value of the second reflection spectrum reaches a preset value;
and the target fiber bragg grating acquisition module is used for removing the reference fiber bragg grating and acquiring the target fiber bragg grating.
7. A computer device, the computer device comprising:
one or more processors;
storage means for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors implement the method of inscribing a fiber grating as recited in any of claims 1-5.
8. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements a method of inscribing a fiber grating according to any of claims 1-5.
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| CN104679375A (en) * | 2015-03-17 | 2015-06-03 | 京东方科技集团股份有限公司 | Method and device for optimizing signal-to-noise ratio parameter |
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