CN110470456B - Optical insertion return loss calibration device and test method - Google Patents
Optical insertion return loss calibration device and test method Download PDFInfo
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
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Abstract
The application provides a calibration device and a test method for optical insertion return loss, wherein the device comprises: a total optical coupler and a total optical reflection mirror; the total optical coupler having N input ports and 2 output ports; the N input ports are respectively connected with the light source output port of the optical insertion return loss tester; the optical power input port of the optical insertion return loss tester is connected with the optical total reflection mirror through a first output port and is connected with the optical power input port of the optical insertion return loss tester through a second output port; wherein N is an integer greater than 0; and the optical total reflector is used for reflecting the optical signal power entering from the input port of the total optical coupler. The optical insertion return loss calibration device consists of all-optical passive devices, and has the characteristics of small volume, easiness in integration, simplicity and convenience in operation and suitability for various optical insertion return loss testers.
Description
Technical Field
The invention relates to the technical field of testing, in particular to an optical plug return loss calibration device and a testing method.
Background
The optical insertion return loss tester is a multifunctional optical communication tester integrating a stabilized light source, a high-precision optical power meter, an insertion loss tester and a return loss tester into a whole. The method is widely applied to insertion loss and return loss tests and stability measurement of optical fiber cables, optical passive devices and optical fiber communication systems.
The existing calibration device takes the optical insertion loss and the return loss of an optical insertion return loss tester as two independent parts to be calibrated respectively, namely two sets of calibration devices are adopted, and active equipment such as an optical attenuator is used, so that the existing calibration device has the defects of complicated calibration steps, long preheating and calibration time, high calibration field requirement and the like.
Disclosure of Invention
In view of this, the present application provides an optical add-drop return loss calibration apparatus and a test method, where the optical add-drop return loss calibration apparatus is composed of all-optical passive devices, and has the characteristics of small volume, easy integration, simple operation, and applicability to various optical add-drop return loss testers.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
in one embodiment, there is provided an optical add-back loss calibration apparatus, the apparatus comprising: a total optical coupler and a total optical reflection mirror;
the total optical coupler having N input ports and 2 output ports; the N input ports are respectively connected with the light source output port of the optical insertion return loss tester; the optical power input port of the optical insertion return loss tester is connected with the optical total reflection mirror through a first output port and is connected with the optical power input port of the optical insertion return loss tester through a second output port; wherein N is an integer greater than 0;
and the optical total reflector is used for reflecting the optical signal power entering from the input port of the total optical coupler.
Wherein,
the total optical coupler is formed by cascading N optical splitting couplers for N times.
And the splitting ratio of the N input ports is determined according to the test requirement of the optical insertion return loss tester.
In another embodiment, a method for testing an optical add-drop loss calibration apparatus is provided, which is applied to a system including an optical add-drop loss tester and the optical add-drop loss calibration apparatus, and the method includes:
when the optical insertion return loss tester is in a normal working state, connecting a second output port of the optical insertion return loss calibration device with an optical power input port of the optical insertion return loss tester;
the following operations are respectively carried out for each input port:
connecting a light source output port of the optical insertion return loss tester with an ith input port of the optical insertion return loss tester calibration device; wherein i is an integer of not less than 1 and not more than N;
starting a test program of the optical insertion return loss tester, and recording an optical return loss test value and an optical insertion loss test value which correspond to the optical insertion return loss tester when the optical insertion return loss tester is connected with the ith input port;
and comparing the optical return loss test value and the optical return loss reference value corresponding to the ith input port, and comparing the corresponding optical insertion loss test value and the corresponding optical insertion loss reference value.
Wherein, the comparing the optical return loss test value and the optical return loss reference value corresponding to the ith input port, and the corresponding optical insertion loss test value and the corresponding optical insertion loss reference value includes:
calculating the absolute value of the difference value between the optical insertion loss test value and the optical insertion loss reference value, and if the absolute value of the difference value is smaller than a first preset error value, determining that the calibration for the ith input port is qualified; otherwise, determining that the calibration for the ith input port is not qualified;
calculating the absolute value of the difference value between the optical return loss test value and the optical return loss reference value, and if the absolute value of the difference value is smaller than a second preset error value, determining that the calibration for the ith input port is qualified; otherwise, the calibration for the ith input port is determined to be not qualified.
Wherein the method further comprises:
and starting the optical plug return loss tester to preheat and perform self calibration so that the tester is in a normal working state.
Wherein the method further comprises:
and acquiring optical insertion loss reference values and optical return loss reference values corresponding to the N input ports.
The obtaining of the optical insertion loss reference value and the optical return loss reference value corresponding to the N input ports includes:
respectively acquiring an optical insertion loss reference value and an optical return loss reference value corresponding to each input port;
acquiring an optical insertion loss reference value and an optical return loss reference value corresponding to the ith input port, including:
measuring an optical insertion loss value from an ith input port to a second output port by using a standard light source and a standard optical power meter, and taking the optical insertion loss value as an optical insertion loss reference value corresponding to the ith input port;
measuring an optical insertion loss value from the ith input port to the first output port by using a standard light source and a standard optical power meter;
and calculating the difference value between the optical insertion loss value from the ith input port to the first output port and the optical total reflector loss value, wherein the optical return loss reference value corresponding to the ith input port is 2 times as large as the optical return loss reference value corresponding to the ith input port.
According to the technical scheme, the optical insertion loss calibrating device in the embodiment is composed of all-optical passive devices, the number of the input ports can be set according to the test requirements of the optical insertion loss tester, and the optical insertion loss calibrating device has the advantages of being small in size, easy to integrate, simple and convenient to operate and suitable for various optical insertion loss testers.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic structural diagram of an optical add-drop return loss calibration apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an nx 2 optical coupler formed by cascading 1 × 2 optical couplers in the embodiment of the present application;
FIG. 3 is a schematic structural diagram of a test system according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a calibration apparatus for testing optical add-drop return loss according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail with specific examples. Several of the following embodiments may be combined with each other and some details of the same or similar concepts or processes may not be repeated in some embodiments.
The embodiment of the application provides an optical plug return loss calibrating device, the device includes: a total optical coupler and a total optical reflection mirror;
referring to fig. 1, fig. 1 is a schematic structural diagram of an optical add-drop return loss calibration apparatus according to an embodiment of the present disclosure.
In fig. 1, the total optical coupler is an N × 2-way optical coupler having N input ports (input port 1, input port 2 … …, input port N) and 2 output ports; the two output ports are a first output port and a second output port;
the N input ports are respectively connected with the light source output port of the optical insertion return loss tester; that is, when the optical return loss test value and the optical insertion loss test value corresponding to which input port need to be tested, which input port is connected to the light source output port of the optical insertion return loss tester.
Each input port and the first output port (output port 1, optical total reflection mirror) form N fixed return loss reference values for calibrating the optical return loss parameters.
The optical power input port of the optical insertion return loss tester is connected with the optical total reflection mirror through a first output port and is connected with the optical power input port of the optical insertion return loss tester through a second output port; wherein N is an integer greater than 0;
each input port and the second output port (output port 2) form N fixed insertion loss reference values for calibrating the optical insertion loss parameter.
And the optical total reflector is used for reflecting the optical signal power entering from the input port of the total optical coupler.
If the number of the input ports has test requirements, determining N according to the test requirements; if there is no testing requirement, the default is set according to the requirements of the JJF 1325-2011 standard specification, and the return loss value of the calibrator is 15dB, 30dB, 45dB or other values.
The splitting ratio of the N input ports is determined according to the test requirements of the optical insertion return loss tester, and the splitting ratio of each input port can be the same or different, such as equal ratio increase and the like.
The implementation manner of the optical coupler of N × 2 paths may be various, for example, N optical splitters may be used to form a cascade N times, and may also be implemented by a welding manner.
The following provides a structure of a total optical coupler, namely an Nx 2-path optical coupler realized by N optical splitting couplers through an N secondary cascade.
The optical insertion return loss calibration device is composed of all-optical passive devices, the number of input ports can be set according to the test requirements of the optical insertion return loss tester, and the optical insertion return loss calibration device has the advantages of being small in size, easy to integrate, simple and convenient to operate and suitable for various optical insertion return loss testers.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an nx 2 optical coupler formed by cascading 1 × 2 optical couplers in the embodiment of the present application.
The first N-1 × 2 optical couplers are two input ports and one input port, and taking the first 1 × 2 optical coupler as an example, the input ports are input port 1 and input port 2, the output ports are connected to the second 1 × 2 optical coupler, the input end of the nth 1 × 2 optical coupler is connected to the output ports of the N-1 × 2 optical couplers, and the output ports include two output ports, which are output port 1 and output port 2, i.e., the first output port and the second output port.
After the optical insertion return loss calibration device is implemented, an optical insertion loss reference value and an optical return loss reference value need to be determined, and a specific determination process is given as follows:
respectively acquiring an optical insertion loss reference value and an optical return loss reference value corresponding to each input port in the N output ports;
taking the acquisition of the optical insertion loss reference value and the optical return loss reference value corresponding to the ith input port as an example:
determination of optical insertion loss reference value:
measuring an optical insertion loss value from an ith input port to a second output port by using a standard light source and a standard optical power meter, and taking the optical insertion loss value as an optical insertion loss reference value corresponding to the ith input port;
determination of optical return loss reference value:
measuring an optical insertion loss value from the ith input port to the first output port by using a standard light source and a standard optical power meter; at the moment, the optical total reflector is taken down, namely, the optical total reflector does not need to be connected when the optical return loss reference value is determined.
Calculating the difference value between the optical insertion loss value from the ith input port to the first output port and the optical total reflector loss value, wherein the optical return loss reference value corresponding to the ith input port is 2 times as much as the optical insertion loss value from the ith input port to the first output port, and taking the difference value as the optical return loss reference value corresponding to the ith input port:
Ri＝2Pi-Pr；
wherein R isiFor the optical return loss reference value, P, corresponding to the i-th input portiFor the value of the optical insertion loss from the ith input port to the first output port, PrThe loss value of the total optical reflector is determined by the characteristics of the total optical reflector, and the loss values of the total optical reflectors corresponding to different input ports are the same.
The following describes the procedure of testing the optical add/drop return loss calibration apparatus in detail with reference to the accompanying drawings.
The embodiment of the application provides a test method of an optical insertion return loss calibration device, which is applied to a system comprising an optical insertion return loss tester and the optical insertion return loss calibration device.
When the test is needed, the optical plug return loss tester needs to be started to preheat and carry out self calibration, so that the tester is in a normal working state.
The existing optical insertion return loss tester is generally realized by two principles of a winding method and a winding-free method, but the appearance of the tester is that an optical output (an optical power input port) and an optical input (an optical source output port) are both provided.
The optical insertion return loss tester of the winding method can normally test after self calibration, and the winding-free method generally does not need to calibrate optical power, but needs self calibration of other parameters.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a test system in an embodiment of the present application.
In fig. 3, the test is performed on the connection input port 1 as an example, that is, the connection is indicated by a solid line, and the connection of another input port is indicated by a broken line, and when the test is performed on the connection input port 1, the connection of another input port is not necessary. The output port 1 (first output port) is connected with the optical total reflection mirror, and the output port 2 is connected with an optical power input port for optical insertion return loss test.
The following operations are respectively carried out for each input port:
referring to fig. 4, fig. 4 is a schematic flow chart of a calibration apparatus for testing optical add-drop return loss according to an embodiment of the present disclosure. The method comprises the following specific steps:
Wherein i is an integer of not less than 1 and not more than N;
in this embodiment, each input port is tested, and the connection of the two output ports of the total optical coupler is always kept unchanged in the test process, and only the connection of the input ports needs to be replaced.
The implementation of starting the test program of the optical insertion loss tester is determined according to different optical insertion loss testers, some optical insertion loss testers are always tested after being started, and some optical insertion loss testers can be tested only by specific operation.
In the test process, when an output port of the optical insertion return loss tester is connected with one input port of one optical insertion return loss correction device, a group of test values including an optical return loss test value and an optical insertion loss test value corresponding to the currently connected input port can be tested.
When the optical insertion return loss tester is connected with the ith input port, the corresponding optical return loss test value and the optical insertion loss test value which are measured can be recorded, and related data can be displayed on the tester.
Comparing the optical return loss test value and the optical return loss reference value corresponding to the ith input port, and the corresponding optical insertion loss test value and the corresponding optical insertion loss reference value in the step, specifically comprising:
calculating the absolute value of the difference value between the optical insertion loss test value corresponding to the ith input port and the optical insertion loss reference value, and if the absolute value of the difference value is smaller than a first preset error value, determining that the calibration for the ith input port is qualified; otherwise, determining that the calibration for the ith input port is not qualified;
calculating the absolute value of the difference value between the optical return loss test value corresponding to the ith input port and the optical return loss reference value, and if the absolute value of the difference value is smaller than a second preset error value, determining that the calibration for the ith input port is qualified; otherwise, the calibration for the ith input port is determined to be not qualified.
In the embodiment of the application, the optical return loss reference value and the optical insertion loss reference value corresponding to the N input ports can be set by the optical insertion return loss tester, and comparing the optical return loss test value and the optical insertion loss test value with the corresponding input port respectively to determine whether the calibration of the corresponding input port is qualified, or through a device with calculation capability, such as a PC, obtains the optical return loss test value and the optical insertion loss test value measured by the optical insertion return loss tester aiming at the access of each input port, and configures an optical return loss reference value and an optical insertion loss reference value obtained for each input port, and calculates the difference between the optical return loss test value and the optical return loss reference value for each input port, and the difference value of the optical insertion loss test value and the optical insertion loss reference value is used for judging whether the calibration for the corresponding port is qualified or not.
During specific testing, when traversing N input ports, one input port can be randomly selected from unconnected input ports, and so on until all the input ports are traversed;
or numbering each input port, and sequentially selecting the corresponding input ports to access according to the sequence of the numbers from large to small or from small to large.
The embodiment of the present application does not limit the way of traversing the N input ports.
To sum up, this application constitutes light through optical coupler and light holophote and inserts return loss calibrating device (light insertion loss and light return loss calibrating device), can simulate a N light insertion loss and the optical loss value that is fit for the UAN and inserts return loss tester measurement in certain extent, owing to constitute through the all-optical passive device, compares current calibrating device's realization, has advantages such as small, easy integration, easy and simple to handle, be suitable for various types of light and insert return loss tester.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. An optical add-back loss calibration apparatus, the apparatus comprising: a total optical coupler and a total optical reflection mirror;
the total optical coupler having N input ports and 2 output ports; the N input ports are respectively connected with the light source output port of the optical insertion return loss tester; the optical power input port of the optical insertion return loss tester is connected with the optical total reflection mirror through a first output port and is connected with the optical power input port of the optical insertion return loss tester through a second output port; wherein N is an integer greater than 0;
the optical total reflector is used for reflecting the power of the optical signal entering from the input port of the total optical coupler;
the total optical coupler is formed by cascading N optical splitting couplers for N times;
measuring an optical insertion loss value from an ith input port to a second output port by using a standard light source and a standard optical power meter, wherein the optical insertion loss value is used as an optical insertion loss reference value corresponding to the ith input port; measuring an optical insertion loss value from the ith input port to the first output port by using a standard light source and a standard optical power meter; and the optical total reflection mirror loss calculating module is used for calculating the difference value between the optical insertion loss value from the ith input port to the first output port and the optical total reflection mirror loss value, wherein the optical return loss reference value corresponding to the ith input port is 2 times of the optical insertion loss value from the ith input port to the first output port, and the difference value is used as the optical return loss reference value corresponding to the ith input port.
2. The apparatus of claim 1, wherein the splitting ratio of the N input ports is determined according to the test requirements of the optical add-drop loss tester.
3. A method for testing an optical add-back loss calibration apparatus, the method being applied to a system comprising an optical add-back loss tester and the optical add-back loss calibration apparatus according to any one of claims 1-2, the method comprising:
when the optical insertion return loss tester is in a normal working state, connecting a second output port of the optical insertion return loss calibration device with an optical power input port of the optical insertion return loss tester;
the following operations are respectively carried out for each input port:
connecting a light source output port of the optical insertion return loss tester with an ith input port of the optical insertion return loss tester calibration device; wherein i is an integer of not less than 1 and not more than N;
starting a test program of the optical insertion return loss tester, and recording an optical return loss test value and an optical insertion loss test value which correspond to the optical insertion return loss tester when the optical insertion return loss tester is connected with the ith input port;
and comparing the optical return loss test value and the optical return loss reference value corresponding to the ith input port, and comparing the corresponding optical insertion loss test value and the corresponding optical insertion loss reference value.
4. The method of claim 3, wherein comparing the optical return loss test value and the optical return loss reference value corresponding to the i-th input port, and the corresponding optical insertion loss test value and the optical insertion loss reference value comprises:
calculating the absolute value of the difference value between the optical insertion loss test value and the optical insertion loss reference value, and if the absolute value of the difference value is smaller than a first preset error value, determining that the calibration for the ith input port is qualified; otherwise, determining that the calibration for the ith input port is not qualified;
calculating the absolute value of the difference value between the optical return loss test value and the optical return loss reference value, and if the absolute value of the difference value is smaller than a second preset error value, determining that the calibration for the ith input port is qualified; otherwise, the calibration for the ith input port is determined to be not qualified.
5. The method of claim 3, further comprising:
and starting the optical plug return loss tester to preheat and perform self calibration so that the tester is in a normal working state.
6. The method of claim 4 or 5, further comprising:
and acquiring optical insertion loss reference values and optical return loss reference values corresponding to the N input ports.
7. The method of claim 6, wherein obtaining the optical insertion loss reference value and the optical return loss reference value corresponding to the N input ports comprises:
respectively acquiring an optical insertion loss reference value and an optical return loss reference value corresponding to each input port;
acquiring an optical insertion loss reference value and an optical return loss reference value corresponding to the ith input port, including:
measuring an optical insertion loss value from an ith input port to a second output port by using a standard light source and a standard optical power meter, and taking the optical insertion loss value as an optical insertion loss reference value corresponding to the ith input port;
measuring an optical insertion loss value from the ith input port to the first output port by using a standard light source and a standard optical power meter;
and calculating the difference value between the optical insertion loss value from the ith input port to the first output port and the optical total reflector loss value, wherein the optical return loss reference value corresponding to the ith input port is 2 times as large as the optical return loss reference value corresponding to the ith input port.
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