CN117470507A - Loss testing device and loss testing method for optical device - Google Patents
Loss testing device and loss testing method for optical device Download PDFInfo
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- CN117470507A CN117470507A CN202311451648.6A CN202311451648A CN117470507A CN 117470507 A CN117470507 A CN 117470507A CN 202311451648 A CN202311451648 A CN 202311451648A CN 117470507 A CN117470507 A CN 117470507A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a loss testing device and a loss testing method of an optical device. The loss testing device of the optical device comprises a light source, a beam splitter, a power meter and a processing unit; the output end of the light source is connected with the input end of the beam splitter, the first output end of the beam splitter is connected with the input end of the optical device to be tested, the output end of the optical device to be tested is connected with the first channel of the power meter, the second output end of the beam splitter is connected with the second channel of the power meter, and the power meter is electrically connected with the processing unit. The loss testing device for the optical device can accurately measure the light intensity lost by the optical device to be tested.
Description
Technical Field
The present invention relates to the field of optical device testing technologies, and in particular, to a loss testing device and a loss testing method for an optical device.
Background
An optical power meter is an instrument for measuring the power or intensity of an optical signal. It is widely used in optical communication, optical system debugging, laser performance testing and optical laboratories. The main function of an optical power meter is to measure the optical power in a light beam.
At different wavelengths, the same light intensity may result in different current or voltage outputs. When measuring the light intensity of a multi-wavelength laser, the traditional method is to make the detection wavelength of an optical power meter consistent with the wavelength of the laser, but the operation is complex, the cost is high, and the loss generated when the light beam passes through the optical device is difficult to measure because the optical power at the input end of the optical device is difficult to detect.
Disclosure of Invention
The invention provides a loss testing device and a loss testing method for an optical device, wherein the loss testing device realizes the loss test of the optical device to be tested under the adjustment of setting a fixed test wavelength by a power meter, simplifies the testing flow and reduces the testing cost.
According to an aspect of the present invention, there is provided a loss testing apparatus for an optical device, including a light source, a beam splitter, a power meter, and a processing unit;
the output end of the light source is connected with the input end of the beam splitter, the first output end of the beam splitter is connected with the input end of the optical device to be tested, the output end of the optical device to be tested is connected with the first channel of the power meter, the second output end of the beam splitter is connected with the second channel of the power meter, and the power meter is electrically connected with the processing unit;
the light source is used for outputting a test light beam, the test light beam is divided into a first light beam and a second light beam through the beam splitter, the first light beam is transmitted to a first channel of the power meter after passing through the optical device to be tested, and the second light beam is directly transmitted to a second channel of the power meter;
the power meter obtains first test power according to the light beam received by the first channel, and obtains second test power according to the light beam received by the second channel;
the processing unit is used for acquiring the first test power and the second test power, determining first actual power according to the first test power and the first channel compensation coefficient, determining second actual power according to the second test power, the second channel compensation coefficient and the spectral proportion compensation coefficient, and determining the loss of the optical device to be tested according to the difference between the second actual power and the first actual power.
Optionally, the light source comprises a wavelength tunable laser and the power meter sets a fixed test wavelength.
Optionally, the first channel compensation coefficient of the power meter is obtained through the following steps:
connecting the output end of the wavelength-tunable laser with a first channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of a first channel of the power meter to be the same as the output wavelength of the wavelength-adjustable laser, and acquiring a plurality of first test power values acquired by the first channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of a first channel of the power meter to be a first fixed wavelength, and acquiring a plurality of second test power values acquired by the first channel of the power meter;
obtaining the first channel compensation coefficient according to the plurality of first test power values and the plurality of second test power values;
wherein the first fixed wavelength is between the first wavelength and the second wavelength.
Optionally, the second channel compensation coefficient of the power meter is obtained by the following steps:
connecting the output end of the wavelength-tunable laser with a second channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of the second channel of the power meter to be the same as the output wavelength of the wavelength-adjustable laser, and acquiring a plurality of third test power values acquired by the second channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of the second channel of the power meter to be a first fixed wavelength, and acquiring a plurality of fourth test power values acquired by the second channel of the power meter;
obtaining the second channel compensation coefficient according to the second test power values and the fourth test power values;
wherein the first fixed wavelength is between the first wavelength and the second wavelength.
Optionally, the beam splitting proportion compensation coefficient of the beam splitter is obtained through the following steps:
connecting the output end of the wavelength-adjustable laser with the input end of the beam splitter, wherein the first output end of the beam splitter is connected with the first channel of the power meter, and the second output end of the beam splitter is connected with the second channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of a first channel and a second channel of the power meter to be the same as the output wavelength of the wavelength-adjustable laser, and acquiring a plurality of fifth test power values acquired by the first channel and a plurality of sixth test power values acquired by the second channel of the power meter;
and obtaining the spectral proportion compensation coefficient according to the plurality of fifth test power values and the plurality of sixth test power values.
Optionally, the beam splitting proportion compensation coefficient of the beam splitter is obtained through the following steps:
connecting the output end of the wavelength-adjustable laser with the input end of the beam splitter, wherein the first output end of the beam splitter is connected with the first channel of the power meter, and the second output end of the beam splitter is connected with the second channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelengths of a first channel and a second channel of the power meter to be the first fixed wavelength, and acquiring a plurality of seventh test power values acquired by the first channel and a plurality of eighth test power values acquired by the second channel of the power meter;
and obtaining the spectral proportion compensation coefficient according to the seventh test power values and the eighth test power values.
Optionally, obtaining the spectral proportion compensation coefficient according to the plurality of seventh test power values and the plurality of eighth test power values includes:
obtaining a first real power value of a first channel of the beam splitter according to the seventh test power value and the first channel compensation coefficient;
obtaining a second real power value of a second channel of the beam splitter according to the eighth test power value and the second channel compensation coefficient;
and obtaining the light-splitting proportion compensation coefficient according to the first real power value and the second real power value.
Optionally, the output power of the first output end of the beam splitter is greater than the output power of the second output end of the beam splitter.
Optionally, the light source, the beam splitter, the optical device to be tested and the power meter are connected through optical fibers.
According to another aspect of the present invention, there is provided a loss testing method of an optical device, performed by the loss testing apparatus described above, the loss testing method comprising:
the light source outputs a test light beam, the test light beam is divided into a first light beam and a second light beam by the beam splitter, the first light beam is transmitted to a first channel of the power meter after passing through the optical device to be tested, and the second light beam is directly transmitted to a second channel of the power meter;
the power meter obtains first test power according to the light beam received by the first channel, and obtains second test power according to the light beam received by the second channel;
the processing unit obtains the first test power and the second test power, determines first actual power according to the first test power and a first channel compensation coefficient, determines second actual power according to the second test power, a second channel compensation coefficient and a light splitting proportion compensation coefficient, and determines loss of the optical device to be tested according to the difference between the second actual power and the first actual power.
The invention discloses a loss testing device and a loss testing method of an optical device. The loss testing device of the optical device comprises a light source, a beam splitter, a power meter and a processing unit; the output end of the light source is connected with the input end of the beam splitter, the first output end of the beam splitter is connected with the input end of the optical device to be tested, the output end of the optical device to be tested is connected with the first channel of the power meter, the second output end of the beam splitter is connected with the second channel of the power meter, and the power meter is electrically connected with the processing unit. The loss testing device for the optical device can accurately measure the light intensity lost by the optical device to be tested.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a loss testing apparatus for an optical device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first channel compensation coefficient of a power meter according to an embodiment of the present invention;
FIG. 3 is a graph showing the relationship between the wavelength and the first channel compensation coefficient of the power meter according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a second channel compensation factor for a power meter according to an embodiment of the present invention;
FIG. 5 is a graph of the relationship between wavelength and the compensation coefficient of the second channel of the power meter provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of a structure of a spectral ratio compensation coefficient of a measuring beam splitter according to an embodiment of the present invention;
FIG. 7 is a graph showing the relationship between wavelength and spectral ratio compensation coefficients provided by an embodiment of the present invention;
fig. 8 is a schematic flow chart of a loss testing method of an optical device according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a loss testing device of an optical device according to an embodiment of the present invention, and referring to fig. 1, the loss testing device of an optical device according to an embodiment of the present invention includes a light source 1, a beam splitter 2, a power meter 4, and a processing unit 5; the output end of the light source 1 is connected with the input end of the beam splitter 2, the first output end of the beam splitter 2 is connected with the input end of the optical device 3 to be tested, the output end of the optical device 3 to be tested is connected with the first channel of the power meter 4, the second output end of the beam splitter 2 is connected with the second channel of the power meter 4, and the power meter 4 is electrically connected with the processing unit 5; the light source 1 is used for outputting a test light beam, the test light beam is divided into a first light beam 21 and a second light beam 22 by the beam splitter 2, the first light beam 21 is transmitted to a first channel of the power meter 4 after passing through the optical device 3 to be tested, and the second light beam 22 is directly transmitted to a second channel of the power meter 4; the power meter 4 obtains a first test power according to the light beam received by the first channel, and the power meter 4 obtains a second test power according to the light beam received by the second channel; the processing unit 5 stores a spectral proportion compensation coefficient of the beam splitter 2, a first channel compensation coefficient and a second channel compensation coefficient of the power meter 4, the processing unit 5 is configured to obtain a first test power and a second test power, determine a first actual power according to the first test power and the first channel compensation coefficient, determine a second actual power according to the second test power, the second channel compensation coefficient and the spectral proportion compensation coefficient, and determine a loss of the optical device 3 to be tested according to a difference between the second actual power and the first actual power.
Specifically, referring to fig. 1, a test beam is output from an output end of a light source 1, where the light source 1 may be a wavelength-tunable laser, the test beam is divided into a first beam 21 and a second beam 22 by a beam splitter 2, the first beam 21 is transmitted to a first channel of a power meter 4 after passing through an optical device 3 to be tested, and the second beam 22 is directly transmitted to a second channel of the power meter 4; the power meter 4 obtains a first test power according to the first light beam 21 received by the first channel, and the power meter 4 obtains a second test power according to the second light beam 22 received by the second channel; the processing unit 5 stores a spectral proportion compensation coefficient of the beam splitter 2, a first channel compensation coefficient and a second channel compensation coefficient of the power meter 4 in advance, the processing unit 5 is configured to obtain a first test power and a second test power, determine a first actual power according to the first test power and the first channel compensation coefficient, determine a second actual power according to the second test power, the second channel compensation coefficient and the spectral proportion compensation coefficient, and determine a loss of the optical device 3 to be tested according to a difference between the second actual power and the first actual power.
Optionally, fig. 2 is a schematic structural diagram of a first channel compensation coefficient of a power meter according to an embodiment of the present invention, and as shown in fig. 2, the first channel compensation coefficient of the power meter 4 is obtained by: connecting the output end of the wavelength tunable laser 11 with a first channel d of the power meter 4; controlling the wavelength-adjustable laser 11 to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of the first channel d of the power meter 4 to be the same as the output wavelength of the wavelength-adjustable laser 11, and acquiring a plurality of first test power values acquired by the first channel d of the power meter 4; controlling the wavelength-adjustable laser 11 to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of the first channel d of the power meter 4 to be a first fixed wavelength, and acquiring a plurality of second test power values acquired by the first channel d of the power meter 4; obtaining a first channel compensation coefficient according to the plurality of first test power values and the plurality of second test power values; wherein the first fixed wavelength is between the first wavelength and the second wavelength.
Illustratively, with continued reference to fig. 2, the output end of the wavelength tunable laser 11 is connected to the first channel d of the power meter 4, and the wavelength tunable laser 11 is controlled to emit light beams having wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, and the test wavelength of the first channel d of the power meter 4 is adjusted to be the same as the output wavelength of the wavelength tunable laser 11 (for example, when the wavelength tunable laser 11 outputs 1550nm light, the receiving wavelength set by the power meter 4 is 1550 nm), so that the first channel d of the power meter 4 can obtain a plurality of first test power values corresponding to wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, respectively; the tunable wavelength laser 11 is controlled to emit light beams with wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, and the test wavelength of the first channel of the power meter 4 is controlled to be a first fixed wavelength (for example 1550 nm), so that the first channel d of the power meter 4 can obtain a plurality of second test power values corresponding to the wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, but the power meter 4 does not change the test wavelength during the test, so that only the second test power values corresponding to the first fixed wavelength 1550nm are accurate, and the rest of power test values corresponding to the wavelengths of 1530nm, 1540nm, 1560nm and 1570nm are deviated, so that the power compensation coefficient corresponding to each wavelength needs to be calculated by performing power compensation on the corresponding 4 second test power values according to the first test power value. Thus, five power compensation coefficients corresponding to wavelengths 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, referred to as the first channel compensation coefficients of the power meter 4, are obtained.
Fig. 3 is a graph of the relationship between the wavelength and the first channel compensation coefficient of the power meter according to the embodiment of the present invention, and the relationship between the wavelength and the first channel compensation coefficient of the power meter 4 shown in fig. 3 is obtained by performing curve fitting on the wavelength and the first channel compensation coefficient of the power meter. The above-described taking of light beams having wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm as test light beams is merely for explaining how to obtain a graph as shown in fig. 3, and is not intended to limit the present invention.
Optionally, fig. 4 is a schematic structural diagram of a second channel compensation coefficient of the power meter according to the embodiment of the present invention, and as shown in fig. 4, the second channel compensation coefficient of the power meter 4 is obtained by: connecting the output end of the wavelength tunable laser 11 with a second channel e of the power meter 4; controlling the wavelength-adjustable laser 11 to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of the second channel e of the power meter 4 to be the same as the output wavelength of the wavelength-adjustable laser 11, and acquiring a plurality of third test power values acquired by the second channel e of the power meter; controlling the wavelength-adjustable laser 11 to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of the second channel e of the power meter 4 to be a first fixed wavelength, and acquiring a plurality of fourth test power values acquired by the second channel e of the power meter 4; obtaining a second channel compensation coefficient according to the plurality of second test power values and the plurality of fourth test power values; wherein the first fixed wavelength is between the first wavelength and the second wavelength.
Illustratively, with continued reference to fig. 4, the output end of the wavelength tunable laser 11 is connected to the second channel e of the power meter 4, the wavelength tunable laser 11 is controlled to emit light beams having wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, and the test wavelength of the second channel e of the power meter 4 is adjusted to be the same as the output wavelength of the wavelength tunable laser 11 (for example, when the wavelength tunable laser 11 outputs 1550nm light, the receiving wavelength set by the power meter 4 is 1550 nm), so that the second channel e of the power meter 4 can obtain a plurality of third test power values corresponding to wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570 nm; the wavelength-tunable laser 11 is controlled to emit a plurality of light beams with wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, and the second channel test wavelength of the power meter 4 is controlled to be a first fixed wavelength (for example 1550 nm), so that the second channel e of the power meter 4 can obtain a plurality of fourth test power values corresponding to the wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, but the power meter 4 does not change the test wavelength during the test, so that only the fourth test power values corresponding to the first fixed wavelength 1550nm are accurate, and the power test values corresponding to the wavelengths of 1530nm, 1540nm, 1560nm and 1570nm are all biased, so that the power compensation coefficient corresponding to each wavelength needs to be calculated by performing power compensation on the corresponding 4 fourth test power values according to the third test power value. Thus, five power compensation coefficients corresponding to wavelengths 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, referred to as second channel compensation coefficients of the power meter 4, are obtained.
Fig. 5 is a graph of the relationship between the wavelength and the second channel compensation coefficient of the power meter according to the embodiment of the present invention, and the relationship between the wavelength and the second channel compensation coefficient of the power meter 4 shown in fig. 5 is obtained by performing curve fitting on the wavelength and the second channel compensation coefficient of the power meter. The above-described taking of light beams having wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm as test light beams is merely for explaining how to obtain a graph as shown in fig. 5, and is not intended to limit the present invention.
Optionally, fig. 6 is a schematic structural diagram of a spectral ratio compensation coefficient of a measuring beam splitter according to an embodiment of the present invention, and as shown in fig. 6, the spectral ratio compensation coefficient of a beam splitter 2 is obtained by: the output end of the wavelength-tunable laser 11 is connected with the input end of the beam splitter 2, the first output end of the beam splitter 2 is connected with the first channel d of the power meter 4, and the second output end of the beam splitter 2 is connected with the second channel e of the power meter 4; controlling the wavelength-tunable laser 11 to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelengths of the first channel d and the second channel e of the power meter 4 to be the same as the output wavelength of the wavelength-tunable laser 11, and acquiring a plurality of fifth test power values acquired by the first channel d and a plurality of sixth test power values acquired by the second channel e of the power meter 4; and obtaining the light splitting proportion compensation coefficient according to the fifth test power values and the sixth test power values.
The above embodiment is to obtain the spectral ratio compensation coefficient from the true values by directly measuring the true values of the two channels of the power meter 4 by controlling the test wavelengths of the first channel d and the second channel e of the power meter 4 to be the same as the output wavelength of the wavelength tunable laser 11.
Illustratively, referring to fig. 6, the output end of the wavelength-tunable laser 11 is connected to the input end of the beam splitter 2, the first output end of the beam splitter 2 is connected to the first channel d of the power meter 4, the second output end of the beam splitter 2 is connected to the second channel e of the power meter 4, the wavelength-tunable laser 11 is controlled to emit light beams having wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm, and the test wavelength of the first channel d of the power meter 4 and the test wavelength of the second channel e are both adjusted to be the same as the output wavelength of the wavelength-tunable laser 11 (for example, the reception wavelength set by the power meter 4 when the wavelength-tunable laser 11 outputs 1550nm is also 1550 nm), so that the first channel d of the power meter 4 can obtain a plurality of fifth test power values corresponding to wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm and a plurality of sixth test power values corresponding to wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570 nm; the fifth test power value and the sixth test power value are all true values, so that the spectral ratio compensation coefficient is obtained.
FIG. 7 is a graph showing the relationship between the wavelength and the spectral ratio compensation coefficient according to the embodiment of the present invention, and the relationship between the wavelength and the spectral ratio compensation coefficient shown in FIG. 7 is obtained by performing curve fitting on the wavelength and the spectral ratio compensation coefficient. The above-described taking of light beams having wavelengths of 1530nm, 1540nm, 1550nm, 1560nm and 1570nm as test light beams is merely for explaining how to obtain a graph as shown in fig. 7, and is not intended to limit the present invention.
Optionally, with continued reference to fig. 6, the spectral proportionality compensation coefficient of the beam splitter 2 may also be obtained by: the output end of the wavelength-tunable laser 11 is connected with the input end of the beam splitter 2, the first output end of the beam splitter 2 is connected with the first channel d of the power meter 4, and the second output end of the beam splitter 2 is connected with the second channel e of the power meter 4; controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelengths of a first channel d and a second channel e of the power meter 4 to be first fixed wavelength, and acquiring a plurality of seventh test power values acquired by the first channel d and a plurality of eighth test power values acquired by the second channel e of the power meter 4; and obtaining a light splitting proportion compensation coefficient according to the seventh test power values and the eighth test power values.
Optionally, obtaining the spectral proportion compensation coefficient according to the plurality of seventh test power values and the plurality of eighth test power values includes: obtaining a first real power value of a first channel d of the beam splitter 2 according to the seventh test power value and the first channel compensation coefficient; obtaining a second real power value of a second channel e of the beam splitter 2 according to the eighth test power value and the second channel compensation coefficient; and obtaining a light-splitting proportion compensation coefficient according to the first real power value and the second real power value.
In the above embodiment, the test wavelengths of the first channel d and the second channel e of the power meter 4 are controlled to be the first fixed wavelength, the measured values of the two channels of the power meter 4 are measured, the true value is calculated according to the measured values and the corresponding channel compensation coefficients, and the spectral ratio compensation coefficients are obtained by using the true value, which is not described in detail herein.
In this embodiment, a wavelength is required to be defined when the power meter 4 is tested, in order to improve the test efficiency, the test wavelength of the power meter 4 is not changed in the test process, and the light intensity obtained by the power meter 4 is defined as the test light intensity; when the wavelength setting of the power meter 4 coincides with the wavelength of the light emitted by the laser, its value is taken as the true light intensity.
The specific method for measuring the loss light intensity of the optical device 3 to be measured by the loss testing device of the optical device provided by the embodiment of the invention comprises the following steps:
1) Obtaining the measured test light intensity of the first channel (point b in fig. 1) of the power meter 4;
2) According to the relation curve between the compensation coefficient of the first channel and the wavelength emitted by the light source 1 as shown in fig. 3, calculating the light intensity compensation measured by the first channel of the power meter 4 as the real light intensity of the first channel;
3) Obtaining the measured test light intensity of the second channel (point c in fig. 1) of the power meter 4;
4) According to the relation curve between the compensation coefficient of the second channel and the wavelength emitted by the light source 1 as shown in fig. 5, calculating the light intensity compensation measured by the second channel of the power meter 4 as the real light intensity of the second channel;
5) Calculating the real light intensity compensation of the second channel calculated in the step 4 as the real light intensity (point a in fig. 1) according to the light splitting proportion compensation coefficient (shown in fig. 7) stored in advance in the beam splitter 2 and the processing unit 5;
6) And (3) making a difference between the actual light intensity of the point a obtained in the step (5) and the actual light intensity of the point b obtained in the step (2) to obtain the light intensity lost by the optical device 3 to be tested.
According to the loss testing device for the optical device, provided by the embodiment of the invention, the first actual power is determined according to the first testing power and the first channel compensation coefficient by acquiring the first testing power and the second testing power, the second actual power is determined according to the second testing power, the second channel compensation coefficient and the light splitting proportion compensation coefficient, and the light intensity lost by the optical device to be tested can be accurately measured by making a difference between the second actual power and the first actual power.
Optionally, the light source 1 comprises a wavelength tunable laser and the power meter 4 sets a fixed test wavelength.
Optionally, the output power of the first output of the beam splitter 2 is greater than the output power of the second output of the beam splitter 2.
In specific implementation, the beam splitter 2 may have a beam splitting ratio of 90:10, namely the first output end outputs 90% of power and the second output end outputs 10% of power, and the purpose of the embodiment of the invention is to measure the loss of the optical device to be measured, so that the power of the first output end is larger, thereby being beneficial to measuring accurately.
Optionally, the light source 1, the beam splitter 2, the optical device to be tested 3 and the power meter 4 are connected through optical fibers.
The loss during light beam transmission can be reduced by arranging the optical fiber, and the test accuracy is improved.
Based on the same conception, the embodiment of the invention also provides a loss testing method of the optical device. Fig. 8 is a flow chart of a loss testing method of an optical device according to an embodiment of the present invention, as shown in fig. 8, the method of the embodiment includes the following steps:
s101: the light source outputs a test light beam, the test light beam is divided into a first light beam and a second light beam by the beam splitter, the first light beam is transmitted to a first channel of the power meter after passing through the optical device to be tested, and the second light beam is directly transmitted to a second channel of the power meter;
s102: the power meter obtains first test power according to the light beam received by the first channel, and obtains second test power according to the light beam received by the second channel;
s103: the processing unit obtains first test power and second test power, determines first actual power according to the first test power and a first channel compensation coefficient, determines second actual power according to the second test power, the second channel compensation coefficient and a split proportion compensation coefficient, and determines loss of the optical device to be tested according to the difference between the second actual power and the first actual power.
Specifically, a test light beam output by a light source is divided into a first light beam and a second light beam by a beam splitter, the first light beam is transmitted to a first channel of a power meter after passing through an optical device to be tested, the second light beam is directly transmitted to a second channel of the power meter, the power meter obtains first test power according to the light beam received by the first channel, the power meter obtains second test power according to the light beam received by the second channel, a processing unit obtains the first test power and the second test power, determines first actual power according to the first test power and a first channel compensation coefficient, determines second actual power according to the second test power, a second channel compensation coefficient and a light splitting proportion compensation coefficient, and determines loss of the optical device to be tested according to the difference between the first actual power and the second actual power.
According to the loss testing method for the optical device, the first actual power is determined according to the first testing power and the first channel compensation coefficient, the second actual power is determined according to the second testing power, the second channel compensation coefficient and the light splitting proportion compensation coefficient, and the light intensity lost by the optical device to be tested can be accurately measured by making a difference between the second actual power and the first actual power.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The loss testing device of the optical device is characterized by comprising a light source, a beam splitter, a power meter and a processing unit;
the output end of the light source is connected with the input end of the beam splitter, the first output end of the beam splitter is connected with the input end of the optical device to be tested, the output end of the optical device to be tested is connected with the first channel of the power meter, the second output end of the beam splitter is connected with the second channel of the power meter, and the power meter is electrically connected with the processing unit;
the light source is used for outputting a test light beam, the test light beam is divided into a first light beam and a second light beam through the beam splitter, the first light beam is transmitted to a first channel of the power meter after passing through the optical device to be tested, and the second light beam is directly transmitted to a second channel of the power meter;
the power meter obtains first test power according to the light beam received by the first channel, and obtains second test power according to the light beam received by the second channel;
the processing unit is used for acquiring the first test power and the second test power, determining first actual power according to the first test power and the first channel compensation coefficient, determining second actual power according to the second test power, the second channel compensation coefficient and the spectral proportion compensation coefficient, and determining the loss of the optical device to be tested according to the difference between the second actual power and the first actual power.
2. The optical device loss testing apparatus of claim 1, wherein the light source comprises a wavelength tunable laser and the power meter sets a fixed test wavelength.
3. The loss testing apparatus of an optical device according to claim 2, wherein the first channel compensation coefficient of the power meter is obtained by:
connecting the output end of the wavelength-tunable laser with a first channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of a first channel of the power meter to be the same as the output wavelength of the wavelength-adjustable laser, and acquiring a plurality of first test power values acquired by the first channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of a first channel of the power meter to be a first fixed wavelength, and acquiring a plurality of second test power values acquired by the first channel of the power meter;
obtaining the first channel compensation coefficient according to the plurality of first test power values and the plurality of second test power values;
wherein the first fixed wavelength is between the first wavelength and the second wavelength.
4. A loss testing apparatus for an optical device according to claim 3, wherein the second channel compensation coefficient of the power meter is obtained by:
connecting the output end of the wavelength-tunable laser with a second channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of the second channel of the power meter to be the same as the output wavelength of the wavelength-adjustable laser, and acquiring a plurality of third test power values acquired by the second channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of the second channel of the power meter to be a first fixed wavelength, and acquiring a plurality of fourth test power values acquired by the second channel of the power meter;
obtaining the second channel compensation coefficient according to the second test power values and the fourth test power values;
wherein the first fixed wavelength is between the first wavelength and the second wavelength.
5. The loss testing apparatus of an optical device according to claim 2, wherein the beam splitter has a beam splitting ratio compensation coefficient obtained by:
connecting the output end of the wavelength-adjustable laser with the input end of the beam splitter, wherein the first output end of the beam splitter is connected with the first channel of the power meter, and the second output end of the beam splitter is connected with the second channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelength of a first channel and a second channel of the power meter to be the same as the output wavelength of the wavelength-adjustable laser, and acquiring a plurality of fifth test power values acquired by the first channel and a plurality of sixth test power values acquired by the second channel of the power meter;
and obtaining the spectral proportion compensation coefficient according to the plurality of fifth test power values and the plurality of sixth test power values.
6. The loss testing apparatus of an optical device according to claim 4, wherein the beam splitter has a beam splitting ratio compensation coefficient obtained by:
connecting the output end of the wavelength-adjustable laser with the input end of the beam splitter, wherein the first output end of the beam splitter is connected with the first channel of the power meter, and the second output end of the beam splitter is connected with the second channel of the power meter;
controlling the wavelength-adjustable laser to output a plurality of light beams with first wavelength to second wavelength, controlling the test wavelengths of a first channel and a second channel of the power meter to be the first fixed wavelength, and acquiring a plurality of seventh test power values acquired by the first channel and a plurality of eighth test power values acquired by the second channel of the power meter;
and obtaining the spectral proportion compensation coefficient according to the seventh test power values and the eighth test power values.
7. The loss testing apparatus of an optical device according to claim 6, wherein obtaining the spectral ratio compensation coefficient based on the plurality of seventh test power values and the plurality of eighth test power values comprises:
obtaining a first real power value of a first channel of the beam splitter according to the seventh test power value and the first channel compensation coefficient;
obtaining a second real power value of a second channel of the beam splitter according to the eighth test power value and the second channel compensation coefficient;
and obtaining the light-splitting proportion compensation coefficient according to the first real power value and the second real power value.
8. The optical device loss testing apparatus of claim 1, wherein the output power of the first output of the beam splitter is greater than the output power of the second output of the beam splitter.
9. The device for testing the loss of the optical device according to claim 1, wherein the light source, the beam splitter, the optical device to be tested and the power meter are connected through optical fibers.
10. A loss testing method of an optical device, performed by the loss testing apparatus according to any one of claims 1 to 9, the loss testing method comprising:
the light source outputs a test light beam, the test light beam is divided into a first light beam and a second light beam by the beam splitter, the first light beam is transmitted to a first channel of the power meter after passing through the optical device to be tested, and the second light beam is directly transmitted to a second channel of the power meter;
the power meter obtains first test power according to the light beam received by the first channel, and obtains second test power according to the light beam received by the second channel;
the processing unit obtains the first test power and the second test power, determines first actual power according to the first test power and a first channel compensation coefficient, determines second actual power according to the second test power, a second channel compensation coefficient and a light splitting proportion compensation coefficient, and determines loss of the optical device to be tested according to the difference between the second actual power and the first actual power.
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