CN107271146B - Calibration device and equipment of optical fiber dispersion tester - Google Patents
Calibration device and equipment of optical fiber dispersion tester Download PDFInfo
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- CN107271146B CN107271146B CN201710412389.4A CN201710412389A CN107271146B CN 107271146 B CN107271146 B CN 107271146B CN 201710412389 A CN201710412389 A CN 201710412389A CN 107271146 B CN107271146 B CN 107271146B
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- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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Abstract
The invention discloses a calibration device and equipment of an optical fiber dispersion tester, wherein the calibration device comprises an optical fiber grating with a first length, and the optical fiber grating with the first length is an optical fiber grating with the same dispersion characteristic as a standard optical fiber with a second length; wherein the first length is not more than 20cm, and the second length is not less than 10 km. By adopting the embodiment of the invention, the standard optical fiber more than 10km is not needed for metering, the volume is reduced, the weight is reduced, the cost is reduced, the carrying, the use and the batch production are convenient, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of metering, in particular to a calibration device and equipment of an optical fiber dispersion tester.
Background
The optical fiber has many parameters to be measured, and the main parameters include optical power, optical attenuation, attenuation coefficient, optical fiber bandwidth, dispersion coefficient, refractive index distribution, cut-off wavelength, mode field diameter, numerical aperture, core diameter, roundness, concentricity and the like. The main of these parameters are: the intrinsic optical performance parameters of the material, the optical transmission characteristic parameters, the geometric dimension parameters and the like.
At present, optical fiber parameter testing instruments are already popularized in the market, but due to the lack of practical optical fiber metering standard devices, domestic third-party organizations have not widely developed related services. For example, when calibrating a dispersion tester, a standard optical fiber with length greater than 10km is used as a measurement standard device, which reflects the common defects of the measurement standard device of an optical fiber measuring instrument: the optical fiber is long, the cost is high, and the mass production is not facilitated; the volume is large, the weight is heavy, and the metering service work is not convenient to be carried out on the spot of a client.
Disclosure of Invention
The embodiment of the invention aims to provide a calibration device and equipment of an optical fiber dispersion tester, which do not need to adopt standard optical fibers more than 10km for measurement, effectively reduce the volume and weight of the calibration device, are convenient to carry and use, reduce the cost and are convenient for batch production.
In order to achieve the above object, an embodiment of the present invention provides a calibration apparatus for a fiber dispersion tester, including a fiber grating having a first length, the fiber grating having the first length being a fiber grating having the same dispersion characteristic as a standard fiber having a second length;
wherein the first length is not more than 20cm, and the second length is not less than 10 km.
Compared with the prior art, the calibration device of the optical fiber dispersion tester disclosed by the invention adopts the technical scheme that the optical fiber grating with the length of less than 20cm is adopted to simulate the dispersion characteristic of the standard optical fiber with the length of not less than 10km, so that the problems of large size, heavy weight, high cost, inconvenience in carrying and batch generation of the calibration device caused by the fact that the calibration device in the prior art needs the standard optical fiber with the length of not less than 10km to test dispersion are solved, and the beneficial effects of no need of adopting the standard optical fiber with the length of more than 10km for metering, volume reduction, weight reduction, cost reduction, convenience in carrying, use and batch production are achieved.
Preferably, when the second length is 10km, the first length is 1cm to 10 cm.
Preferably, the calibration device further comprises a strain amount control module, the strain amount control module comprises a temperature controller and a detachable optical fiber disc, a standard optical fiber with a third length is wound on the optical fiber disc, and the optical fiber disc and the optical fiber grating are connected in series through the standard optical fiber;
the strain amount control module is used for controlling the temperature change of a standard optical fiber with a third length wound in the optical fiber disc through the temperature controller so as to change the strain amount of the standard optical fiber with the third length. Therefore, the measurement function of the optical fiber dispersion tester for measuring the dependent variable can be effectively calibrated.
Preferably, the third length is no greater than 1 km.
Preferably, the calibration device further comprises a fiber coupler and a first fiber ring, wherein the first fiber ring and the fiber coupler are connected into a closed loop through a standard fiber;
the optical fiber dispersion tester comprises a first optical interface and a second optical interface, the optical fiber coupler comprises a first input end, a second input end, a first output end and a second output end, the first input end is connected with the first optical interface through a standard optical fiber, and the first output end, the optical fiber disc, the optical fiber grating and the second optical interface are connected in series through the standard optical fiber;
the second input end is connected with one end of the first optical fiber ring through a standard optical fiber, and the second output end is connected with the other end of the first optical fiber ring through a standard optical fiber.
Preferably, the calibration device further comprises a second optical fiber loop; the optical fiber coupler, the optical fiber disc, the optical fiber grating and the second optical fiber ring are connected in series through standard optical fibers.
Preferably, the optical fiber coupler is a 2 x 2 optical fiber coupler.
Preferably, the first optical fiber loop is an optical fiber loop around which a fourth length of standard optical fiber is arranged, and the fourth length is not more than 1 km; and/or the second optical fiber ring is an optical fiber ring wound with a standard optical fiber with a fifth length, and the fifth length is not more than 1 km.
Preferably, the fibre dispersion tester is used to test one or more of the following parameters of the fibre: dispersion, loss, strain, cut-off wavelength, refractive index profile, and mode field diameter.
The embodiment of the invention also provides equipment comprising the calibration device of the optical fiber dispersion tester.
The embodiment of the invention has the following beneficial effects: according to the calibration device of the optical fiber dispersion tester, the optical fiber grating with the length less than 20cm is adopted to simulate the dispersion characteristic of the standard optical fiber with the length not less than 10km, the standard optical fiber with the length more than 10km is not required to be adopted for metering, the size is reduced, the weight is reduced, the cost is reduced, and the calibration device is convenient to carry, use and produce in batches; secondly, through increasing the amount of strain control module, the temperature variation through temperature controller control optical fiber dish judges the dependent variable of optical fiber dish in order to calibrate the dependent variable parameter test function of optical fiber dispersion tester with the change optical fiber, has avoided adopting the problem that the mechanical stretching method calibration leads to bulky, the structure is complicated and be not convenient for the customer scene to carry out the measurement work like this, has reached convenient and practical's beneficial effect, has promoted user experience.
Drawings
Fig. 1 is a schematic view of a connection structure of a calibration device and an optical fiber dispersion tester according to embodiment 1 of the present invention.
FIG. 2 is a dispersion characteristic diagram of a 1cm fiber grating and a 10km standard fiber in example 1 of the present invention.
Fig. 3 is a schematic view of a connection structure of a calibration device and a fiber dispersion tester according to embodiment 2 of the present invention.
Fig. 4 is a schematic view of a connection structure of a calibration device and a fiber dispersion tester according to embodiment 3 of the present invention.
Fig. 5 is a schematic view of a connection structure of a calibration device and a fiber dispersion tester according to embodiment 4 of the present invention.
Fig. 6 is a schematic view of a connection structure of a calibration device and a fiber dispersion tester according to embodiment 5 of the present invention.
Fig. 7 is a schematic view of a connection structure of a calibration device and a fiber dispersion tester according to embodiment 6 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 should be noted in advance that the standard optical fiber mentioned hereinafter is an optical fiber used for data of various relevant parameters such as dispersion, loss, strain, cut-off wavelength, refractive index distribution and mode field diameter obtained by a standard metering device selected in metering, and is used as a reference standard for actual test data in a calibration process, and the transmission performance of the standard optical fiber is also optimal. When standard optical fibers are used for connection of actual optical circuit devices, their transmission loss can be disregarded.
Example 1
Referring to fig. 1, a schematic diagram of a connection structure between a calibration apparatus 1 and an optical fiber dispersion tester 2 according to embodiment 1 of the present invention is shown.
In the present embodiment, the calibration device 1 includes a fiber grating 11 having a first length, the fiber grating 11 having the first length being a fiber grating having the same dispersion characteristics as a standard optical fiber having a second length, wherein the first length is not more than 20cm, and the second length is not less than 10 km.
It should be noted that the first length in the fiber grating 11 having the first length refers to the length of the fiber grating as a whole.
When the calibration device 1 is used to calibrate the test function of the optical fiber dispersion tester for testing dispersion parameters, one end of the fiber grating 11 needs to be connected to the optical interface of the optical fiber dispersion tester 2 for transmitting optical signals, and the other end needs to be connected to the optical interface of the optical fiber dispersion tester 2 for receiving optical signals.
Specifically, in the present embodiment, by using a fiber grating having a length of not more than 20cm and making the fiber grating have the same dispersion characteristics as a standard optical fiber having a length of not less than 10km, it is possible to replace the standard optical fiber having a length of not less than 10km in the calibration of the dispersion parameter of the fiber dispersion tester by simulating the dispersion performance of the standard optical fiber having a length of not less than 10km by using the fiber grating having a length of not more than 20 cm. The fiber grating 11 has high apodization performance and a deep modulation depth of the refractive index of the fiber. And when the second length is 10km, the first length is 1 cm-10 cm. For example, a fiber grating having a length of 1cm or 10cm has the same dispersion characteristics as a standard fiber having a length of 10 km. As shown in fig. 2, in the dispersion characteristic diagram of the 1cm fiber grating and the 10km fiber, since the side of the reflective band gap λ < λ B of the fiber grating is an anomalous dispersion region, in order to satisfy the relationship of λ < λ B, in the experiment, a DFB (Distributed Feedback Laser) light source wavelength of 1550.6nm and a fiber grating bragg wavelength of 1552.1nm are adopted, and the DFB Laser pulse expanded by the fiber grating is consistent with the dispersion expansion of the fiber expanded by 10 km. Therefore, the calibration device can be greatly reduced in size, weight and cost, and is convenient to carry, use and mass production, and convenient to go to a client site to carry out metering service work. The selection of the fiber grating length is not limited to this, and may be selected according to the actual situation.
Example 2
Fig. 3 is a schematic view of a connection structure between the optical fiber dispersion tester 2 and the calibration apparatus 1 according to embodiment 2 of the present invention.
The calibration device 1 of the fiber dispersion tester of the embodiment is further improved on the basis of the embodiment 1, and the improvement is that: the calibration device 1 further comprises a strain gauge control module 12, wherein the strain gauge control module 12 comprises a temperature controller 121 and a detachable optical fiber disc 122, a standard optical fiber with a third length is wound on the optical fiber disc 122, and the optical fiber disc 122 and the fiber bragg grating 11 are connected in series through the standard optical fiber; the strain amount control module 12 is configured to control, through the temperature controller 121, a temperature change of a standard optical fiber with a third length wound in the optical fiber tray 122 to change a strain amount of the standard optical fiber with the third length. The calibration device has the advantages of small volume, simple structure and convenient use.
Specifically, when the strain amount control module 12 is used to calibrate the measurement function of the optical fiber dispersion tester for the strain parameter, only one end of the strain amount control module 12 needs to be connected to the optical interface of the optical fiber dispersion tester 2 for transmitting the optical signal through the standard optical fiber, and the optical interface of the optical fiber dispersion tester 2 for receiving the optical signal is suspended. When the calibration device 1 of this embodiment is used to calibrate the test function of the optical fiber dispersion tester 2 for testing dispersion parameters, one end of the fiber grating 11 needs to be connected to the optical interface of the optical fiber dispersion tester 2 for transmitting optical signals, and the other end needs to be connected to the optical interface of the optical fiber dispersion tester 2 for receiving optical signals. Specifically, when the metering calibration is performed, the connection method can be flexibly selected and processed, and is not limited to the connection method in the drawing.
In addition, when performing specific calibration metrology, the strain amount control module 12 controls the temperature change of the standard optical fiber with the third length wound in the optical fiber tray 122 through the temperature controller 121 to change the strain amount of the standard optical fiber with the third length. The temperature controller 121 has the functions of heating and refrigerating, can realize automatic temperature adjustment, and the adjustable temperature range is-50 ℃ to 50 ℃. Wherein, the optical fiber strain quantity DeltaL/L is alpha DeltaT, wherein alpha is the thermal expansion coefficient of about 5 multiplied by 10－7Since Δ T is a temperature change, the minimum strain amount is (Δ L/L) min ═ α Δ Tmin, and the controllable minimum strain amount is 0.1 μ ∈ at a temperature change accuracy of 0.1 ℃. The strain range depends on the maximum strain, i.e. the position of the fiber-optic transition node, where the strain exceeds |3000 μ ∈ |. In the calibration process of the optical fiber dispersion tester for the testing function of the strain parameters, the temperature controlled by the temperature controller 121 is gradually changed according to the actual requirements, and the result given by the strain tester is read to finish the metering work.
Wherein the third length is no greater than 1 km. The specific length is not limited to this, and may be selected according to the actual situation.
Example 3
This embodiment is further improved on the basis of embodiment 1, and the improvement lies in: as shown in fig. 4, the calibration device 1 further includes a fiber coupler 13 and a first fiber loop 14, and the first fiber loop 14 and the fiber coupler 13 are connected by a standard fiber to form a closed loop. The fiber dispersion tester 2 comprises a first optical interface 21 and a second optical interface 22, the fiber coupler 13 comprises a first input end 131, a second input end 132, a first output end 133 and a second output end 134, the first input end 131 is connected with the first optical interface 21 through a standard optical fiber, and the first output end 131, the fiber grating 11 and the second optical interface 22 are connected in series through a standard optical fiber; the second input end 132 is connected to one end of the first fiber ring 14 via a standard optical fiber, and the second output end 134 is connected to the other end of the first fiber ring 14 via a standard optical fiber.
In this embodiment, when the optical fiber dispersion tester 2 is connected to the first optical interface 21 and the second optical interface 22, the optical signal is transmitted through the first optical interface 21, and the optical signal is received through the second optical interface, so that the test function of the optical fiber dispersion tester for testing the dispersion parameter can be calibrated.
In addition, when the optical fiber dispersion tester 2 suspends, i.e., opens the second optical interface 22, the optical signal is transmitted through the first optical interface 21, at this time, the transmitted optical signal enters through the first input end 131 of the optical fiber coupler 13, two paths of optical signals are branched out at the other end of the optical fiber coupler 13 and are respectively output from the first output end 133 and the second output end 134, and the optical signal output through the second output end 134 passes through the first optical fiber ring 14 and then enters the optical fiber coupler 13, so that the optical signal is continuously attenuated in a closed loop formed by the optical fiber coupler and the first optical fiber ring, and thus, the multi-section loss of the multi-path optical signal is simulated. The calibration of the test function of the loss parameter of the optical fiber dispersion tester 2 can be realized.
The optical fiber coupler is a 2 x 2 optical fiber coupler, the first optical fiber is surrounded with a standard optical fiber with a fourth length, the fourth length is not more than 1km, for example, 1km can be selected, and the selection of the specific length is not limited to the above, and can be selected according to the actual situation.
Example 4
As shown in fig. 5, this embodiment is further improved on the basis of embodiment 2, and the improvement lies in: the calibration device 1 further comprises an optical fiber coupler 13 and a first optical fiber ring 14, wherein the first optical fiber ring 14 and the optical fiber coupler 13 are connected into a closed loop through a standard optical fiber. The first output end 131, the optical fiber disc 122, the fiber bragg grating 11 and the second optical interface 22 are connected in series through a standard optical fiber; the second input 132 is connected to one end of the first fiber optic ring 14 by a standard optical fiber and the second output 134 is connected to the other end of the first fiber optic ring 14 by a standard optical fiber.
In this embodiment, when the optical fiber dispersion tester 2 is connected to the first optical interface 21 and the second optical interface 22, the optical signal is transmitted through the first optical interface 21, and the optical signal is received through the second optical interface, so that the test function of the optical fiber dispersion tester for testing the dispersion parameter can be calibrated.
In addition, when the optical fiber dispersion tester 2 suspends, i.e., opens the second optical interface 22, the optical signal is transmitted through the first optical interface 21, at this time, the transmitted optical signal enters through the first input end 131 of the optical fiber coupler 13, two paths of optical signals are branched out at the other end of the optical fiber coupler 13 and are respectively output from the first output end 133 and the second output end 134, and the optical signal output through the second output end 134 passes through the first optical fiber ring 14 and then enters the optical fiber coupler 13, so that the optical signal is continuously attenuated in a closed loop formed by the optical fiber coupler and the first optical fiber ring, and thus the multi-section loss of the optical signal is simulated. The calibration of the test function of the loss parameter of the optical fiber dispersion tester 2 can be realized. Meanwhile, the temperature controller 121 can also be used for controlling the temperature change of the optical fiber disc 122 for calibrating the measurement function of the optical fiber dispersion tester for the strain parameter. The calibration method is used for calibrating the measurement function of measuring the strain parameter and the loss parameter of the optical fiber dispersion tester.
Example 5
As shown in fig. 6, this embodiment is further improved on the basis of embodiment 3, and the improvement lies in: the calibration device 1 further comprises a second fiber loop 15. The optical fiber coupler 13, the optical fiber grating 11 and the second optical fiber ring 15 are connected in series through a standard optical fiber.
In this embodiment, the range of metrology of the calibration device is increased by adding a second optical fiber loop 15. The second optical fiber loop 15 is an optical fiber loop around which a fifth length of standard optical fiber is wound, where the fifth length is not greater than 1km, for example, the length of the second optical fiber loop 15 may be 1km, and the length is not limited thereto and may be selected according to practical situations.
Example 6
As shown in fig. 7, this embodiment is further improved on the basis of embodiment 4, and the improvement lies in: the calibration device 1 further comprises a second fiber loop 15. The optical fiber coupler 13, the optical fiber disc 122, the optical fiber grating 11 and the second optical fiber ring 15 are connected in series through a standard optical fiber.
In this embodiment, the range of metrology of the calibration device is increased by adding a second optical fiber loop 15. The second optical fiber loop 15 is an optical fiber loop around which a fifth length of standard optical fiber is wound, where the fifth length is not greater than 1km, for example, the length of the second optical fiber loop 15 may be 1km, and the length is not limited thereto and may be selected according to practical situations.
In addition, the fiber dispersion tester 2 is used to test one or more of the following parameters of the fiber: dispersion, loss, strain, cut-off wavelength, refractive index profile, and mode field diameter.
In another embodiment of the present invention, an apparatus is further disclosed, which includes the calibration device for an optical fiber dispersion tester according to any one of embodiments 1 to 6.
According to the calibration device and the calibration equipment of the optical fiber dispersion tester, the optical fiber grating with the length less than 20cm is adopted to simulate the dispersion characteristic of the standard optical fiber with the length not less than 10km, the standard optical fiber with the length more than 10km is not required to be adopted for metering, the volume is reduced, the weight is reduced, the cost is reduced, and the calibration device and the calibration equipment are convenient to carry, use and produce in batches; secondly, through increasing the amount of strain control module, the temperature variation through temperature controller control optical fiber dish judges the dependent variable of optical fiber dish in order to calibrate the dependent variable parameter test function of optical fiber dispersion tester with the change optical fiber, has avoided adopting the problem that the mechanical stretching method calibration leads to bulky, the structure is complicated and be not convenient for the customer scene to carry out the measurement work like this, has reached convenient and practical's beneficial effect, has promoted user experience.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A calibration device of a fiber dispersion tester is characterized in that the calibration device comprises a fiber grating with a first length, wherein the fiber grating with the first length is a fiber grating with the same dispersion characteristic as a standard fiber with a second length;
wherein the first length is not more than 20cm, and the second length is not less than 10 km;
the calibration device further comprises a strain amount control module, the strain amount control module comprises a temperature controller and a detachable optical fiber disc, a standard optical fiber with a third length is wound on the optical fiber disc, and the optical fiber disc and the optical fiber grating are connected in series through the standard optical fiber;
the strain amount control module is used for controlling the temperature change of a standard optical fiber with a third length wound in the optical fiber disc through the temperature controller so as to change the strain amount of the standard optical fiber with the third length;
the calibration device further comprises an optical fiber coupler and a first optical fiber ring, wherein the first optical fiber ring and the optical fiber coupler are connected into a closed loop through a standard optical fiber;
the optical fiber dispersion tester comprises a first optical interface and a second optical interface, the optical fiber coupler comprises a first input end, a second input end, a first output end and a second output end, the first input end is connected with the first optical interface through a standard optical fiber, and the first output end, the optical fiber disc, the optical fiber grating and the second optical interface are connected in series through the standard optical fiber;
the second input end is connected with one end of the first optical fiber ring through a standard optical fiber, and the second output end is connected with the other end of the first optical fiber ring through a standard optical fiber.
2. The apparatus for calibrating an optical fiber dispersion tester as claimed in claim 1, wherein said first length is 1cm to 10cm when said second length is 10 km.
3. The apparatus for calibrating an optical fiber dispersion tester as claimed in claim 1, wherein the third length is not more than 1 km.
4. The calibration apparatus for a fiber dispersion tester according to claim 1, wherein the calibration apparatus further comprises a second fiber loop; the optical fiber coupler, the optical fiber disc, the optical fiber grating and the second optical fiber ring are connected in series through standard optical fibers.
5. The apparatus for calibrating a fiber dispersion tester according to claim 1, wherein said fiber coupler is a 2 x 2 fiber coupler.
6. The apparatus for calibrating a fiber dispersion tester according to claim 4, wherein said first fiber loop is a fiber loop around a standard fiber having a fourth length, said fourth length being not greater than 1 km; and/or the second optical fiber ring is an optical fiber ring wound with a standard optical fiber with a fifth length, and the fifth length is not more than 1 km.
7. The apparatus for calibrating a fiber dispersion tester according to claim 4, wherein the fiber dispersion tester is adapted to test one or more of the following parameters of the fiber: dispersion, loss, strain, cut-off wavelength, refractive index profile, and mode field diameter.
8. An apparatus comprising a calibration device of the fiber dispersion tester according to any one of claims 1 to 7.
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