CN104897373A - Method and device for acquiring linear relationship between laser power and detector photocurrent - Google Patents
Method and device for acquiring linear relationship between laser power and detector photocurrent Download PDFInfo
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- CN104897373A CN104897373A CN201510315161.4A CN201510315161A CN104897373A CN 104897373 A CN104897373 A CN 104897373A CN 201510315161 A CN201510315161 A CN 201510315161A CN 104897373 A CN104897373 A CN 104897373A
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Abstract
The invention provides a method for acquiring a linear relationship between a laser power and an array detector photocurrent. The array is 1*N linear array. The power is P. The photocurrent is C. The linear relationship is a N*N matrix A. The method comprises the steps of a first step, starting a j-th laser and keeping other laser in an off state, wherein j is an integer selected from 1,2,3,...,N; a second step, measuring the output power Pj of the j-th laser, and respectively measuring photocurrent Ci (i is an integer selected from 1,2,3,..., N) of N detectors; a third step, calculating all elements of a j-row through a formula aij=Ci/Pj; a fourth step, aiming at different values of j, circulating the first step to the third step until N lasers are respectively started one by one, and calculating for obtaining all elements aij of the matrix A-1; and a fifth step, performing inverse operation on the matrix A-1 for obtaining a matrix A. The matrix A which is obtained through the method can truly reflect the linear relationship between the array laser power and the array detector photocurrent. Even on condition that a channel crosstalk exists in use of the array laser, the actual power of the laser can be obtained.
Description
Technical field
The present invention relates to array laser, particularly relate to a kind of method and the device that obtain linear relationship between array laser power and detector array photocurrent.
Background technology
In the use of online array laser, usually need to monitor the power of each laser instrument.Due to the close together between laser instrument, and the linear array photodetector of normally equal number for monitoring, the photocurrent that these photodetectors read often comprises the noise information of adjoining laser parasitic light, makes to produce error to each channel laser power reading.In order to avoid the crosstalk of interchannel, current usual way is seeking solution in light path design and dependency structure.Such as on photodetector, design lens, light hurdle and optical filter, but structurally by hardware compare be difficult to realize.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of method and the device that obtain linear relationship between array laser power and detector array photocurrent, can linear relationship between truly expressed array laser power and detector array photocurrent, even if when there being channel interference during array laser uses, the real power of laser instrument also can be obtained by this linear relationship.
In view of this, embodiments provide a kind of method obtaining linear relationship between array laser power and detector array photocurrent, described array is 1 × N linear array, described power is P, described photocurrent is C, and described linear relationship is the matrix A of N × N, comprising:
Step one, open a jth laser instrument, other laser instruments are closed condition, and j is 1,2,3 ... N;
Step 2, measures the output power P of a described jth laser instrument
j, and measure the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N;
Step 3, calculates jth by following formula (3) and arranges all element a
ij=C
i/ P
j;
By formula P=AC (1)
Obtain
Turning to system of linear equations is:
Step 4, for the value that j is different, circulation step one to step 3, until N number of laser instrument was opened all one by one, and calculates matrix A
-1whole element a
ij;
Step 5, to matrix A
-1carry out inverse operation and obtain matrix A.
Accordingly, embodiments provide a kind of device obtaining linear relationship between array laser power and detector array photocurrent, described array is 1 × N linear array, described power is P, described photocurrent is C, and described linear relationship is the matrix A of N × N, comprising:
Open unit, for opening a jth laser instrument, other laser instruments are closed condition, and j is 1,2,3 ... N;
Measuring unit, for measuring the output power P of a described jth laser instrument
j, and measure the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N;
Computing unit, arranges all element a for calculating jth by following formula (3)
ij=C
i/ P
j;
By formula P=AC (1)
Obtain
Turning to system of linear equations is:
Control module, for for the different value of j, controls described unlatching unit, measuring unit, computing unit periodic duty, until N number of laser instrument was opened all one by one, and calculates matrix A
-1whole element a
ij;
Inverse operation unit, for matrix A
-1carry out inverse operation and obtain matrix A.
Accordingly, embodiments provide a kind of method obtaining laser instrument real power in array laser use, described array is 1 × N linear array, comprising:
Open all N number of laser instruments;
Measure the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N, described photocurrent C
ifor comprising the photocurrent of other N-1 laser instrument parasitic light;
Obtain the matrix A obtained according to method described in claim 1, calculated the real power P of each laser instrument by formula P=AC
i.
Further, described acquisition according to described in claim 1 method obtain matrix A step before, also comprise:
Prestore the matrix A obtained according to method described in claim 1.
Accordingly, embodiments provide a kind of device obtaining laser instrument real power in array laser use, described array is 1 × N linear array, comprising:
Open unit, for opening all N number of laser instruments;
Measuring unit, for measuring the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N, described photocurrent C
ifor comprising the photocurrent of other N-1 laser instrument parasitic light;
Computing unit, for obtaining the matrix A obtained according to method described in claim 1, and calculates the real power P of each laser instrument by formula P=AC
i.
Further, also comprise:
Storage unit, for storing the matrix A obtained according to method described in claim 1.
Use the matrix A that obtains of the method, can linear relationship between truly expressed array laser power and detector array photocurrent, even if when there being channel interference during array laser uses, the real power of laser instrument also can be obtained.
Accompanying drawing explanation
Fig. 1 is the embodiment of the method process flow diagram of linear relationship between acquisition array laser power provided by the invention and detector array photocurrent;
Fig. 2 is the device embodiment block diagram of linear relationship between acquisition array laser power provided by the invention and detector array photocurrent;
Fig. 3 is the embodiment of the method process flow diagram of laser instrument real power during acquisition array laser provided by the invention uses;
Fig. 4 is device embodiment one block diagram of laser instrument real power during acquisition array laser provided by the invention uses;
Fig. 5 is device embodiment two block diagram of laser instrument real power during acquisition array laser provided by the invention uses.
Embodiment
Embodiments provide a kind of method obtaining linear relationship between array laser power and detector array photocurrent, described array is 1 × N linear array, and described power is P, and described photocurrent is C, and described linear relationship is the matrix A of N × N.In embody rule, be N number of channel side by side, each channel laser instrument, and a corresponding detector detects the photocurrent of this laser instrument to calculate its power, ensures the stable output of laser power.
Fig. 1 is the embodiment of the method process flow diagram of linear relationship between acquisition array laser power provided by the invention and detector array photocurrent, refers to Fig. 1.
101, step one, open a jth laser instrument, other laser instruments are closed condition, and j is 1,2,3 ... N.
Concrete, the present embodiment, for j=1, when other laser instruments are closed condition, opens the 1st laser instrument.Certainly, the 2nd also can be opened, the 3rd ... N number of laser instrument.
102, step 2, measures the output power P of a described jth laser instrument
j, and measure the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N.
Concrete, owing to now only opening the 1st unique laser instrument, its output power P therefore measured
1it is actual value accurately; And the photocurrent C of the N number of detector measured
1, C
2, C
3c
nin, C
1for the photocurrent of the 1st laser instrument that the 1st detector of correspondence detects, all the other C
2, C
3c
nbe the parasitic light of the 1st laser instrument that other detectors detect, namely each laser instrument all has impact to the photocurrent that other all detectors detect, and also namely has impact to the laser output power of its respective channel.
103, step 3, goes out jth by formulae discovery and arranges all element a
ij=C
i/ P
j.
Concrete, owing to measuring output power P in step 2
1with photocurrent C
1, C
2, C
3c
n, therefore, all element a of the 1st row can be calculated by following formula (3)
11, a
21, a
31a
n1, this column element i.e. the 1st laser instrument is to the factor of influence of other laser instruments.
By formula P=AC (1)
Obtain
Turning to system of linear equations is:
104, step 4, for the value that j is different, circulation step one to step 3, until N number of laser instrument was opened all one by one, and calculates matrix A
-1whole element a
ij.
Concrete, arrange all element a according to previous calculations the 1st
11, a
21, a
31a
n1same procedure, for the value that j is different, such as j=2, circulation performs step one to step 3, calculates all element a of the 2nd row
12, a
22, a
32a
n2; Same, j=3, circulation performs step one to step 3, calculates the element a that the 3rd row are all
13, a
23, a
33a
n3; J=4 ... until N number of laser instrument was opened all one by one, and calculate matrix A
-1whole element a
ij.
105, step 5, to matrix A
-1carry out inverse operation and obtain matrix A.
Concrete, matrix inversion transform operation is common practise, repeats no more herein.
The matrix A that the present embodiment method obtains, owing to calculating the factor of influence of each laser instrument to the photocurrent that other all detectors detect, can linear relationship between truly expressed array laser power and detector array photocurrent, use this matrix A, even if when there being channel interference during array laser uses, the real power of laser instrument also can be calculated.
Accordingly, the embodiment of the present invention additionally provides a kind of device obtaining linear relationship between array laser power and detector array photocurrent, and described array is 1 × N linear array, and described power is P, described photocurrent is C, and described linear relationship is the matrix A of N × N.In embody rule, be N number of channel side by side, each channel laser instrument, and a corresponding detector detects the photocurrent of this laser instrument to calculate its power, ensures the stable output of laser power.
Fig. 2 is the device embodiment block diagram of linear relationship between acquisition array laser power provided by the invention and detector array photocurrent.It should be noted that, the connecting line in the present embodiment between each parts, do not necessarily represent between each parts and carry out physical connection, also can to represent between each parts interrelated or interactional relation in logic.
Refer to Fig. 2, the present embodiment provides a kind of device 2 obtaining linear relationship between array laser power and detector array photocurrent, and this device 2 comprises opens unit 21, measuring unit 22, computing unit 23, control module 24 and inverse operation unit 25.
Described unlatching unit 21, for opening a jth laser instrument, other laser instruments are closed condition, and j is 1,2,3 ... N.
Concrete, the present embodiment, for j=1, when other laser instruments are closed condition, opens the 1st laser instrument.Certainly, the 2nd also can be opened, the 3rd ... N number of laser instrument.
Described measuring unit 22, for measuring the output power P of a described jth laser instrument
j, and measure the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N.
Concrete, because now described unlatching unit 11 only opens the 1st unique laser instrument, its output power P of therefore described measuring unit 22 measurement
1it is actual value accurately; And the photocurrent C of the N number of detector measured
1, C
2, C
3c
nin, C
1for the photocurrent of the 1st laser instrument that the 1st detector of correspondence detects, all the other C
2, C
3c
nbe the parasitic light of the 1st laser instrument that other detectors detect, namely each laser instrument all has impact to the photocurrent that other all detectors detect, and also namely has impact to the laser output power of its respective channel.
Described computing unit 23, arranges all element a for calculating jth by following formula (3)
ij=C
i/ P
j.Concrete, because described measuring unit 22 measures output power P
1with photocurrent C
1, C
2, C
3c
n, therefore, all element a of the 1st row can be calculated by following formula (3)
11, a
21, a
31a
n1, this column element i.e. the 1st laser instrument is to the factor of influence of other laser instruments.
By formula P=AC (1)
Obtain
Turning to system of linear equations is:
Described control module 24, for for the different value of j, controls described unlatching unit, measuring unit, computing unit periodic duty, until N number of laser instrument was opened all one by one, and calculates matrix A
-1whole element a
ij.
Concrete, described control module 24 is for the different value of j, and such as j=2, controls described unlatching unit 21, measuring unit 22, computing unit 23 periodic duty, calculates the element a that the 2nd row are all
12, a
22, a
32a
n2; Same, j=3, controls described unlatching unit, measuring unit, computing unit periodic duty, calculates the element a that the 3rd row are all
13, a
23, a
33a
n3; J=4 ... until N number of laser instrument was opened all one by one, and calculate matrix A
-1whole element a
ij.
Described inverse operation unit 25, for matrix A
-1carry out inverse operation and obtain matrix A.
Concrete, matrix inversion transform operation is common practise, repeats no more herein.
The matrix A that application the present embodiment device obtains, owing to calculating the factor of influence of each laser instrument to the photocurrent that other all detectors detect, can linear relationship between truly expressed array laser power and detector array photocurrent, use this matrix A, even if when there being channel interference during array laser uses, the real power of laser instrument also can be calculated.
Accordingly, the embodiment of the present invention additionally provides a kind of method obtaining laser instrument real power in array laser use, and described array is 1 × N linear array.In embody rule, be N number of channel side by side, each channel laser instrument, and a corresponding detector detects the photocurrent of this laser instrument to calculate its power, ensures the stable output of laser power.
Fig. 3 is the embodiment of the method process flow diagram of laser instrument real power during acquisition array laser provided by the invention uses, and refers to Fig. 3.
Step 301, opens all N number of laser instruments.
Concrete, in actual applications, be all generally open all N number of laser instruments simultaneously.
Step 302, measures the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N, described photocurrent C
ifor comprising the photocurrent of other N-1 laser instrument parasitic light.
Concrete, due to the close together between this N number of laser instrument, and the linear array photodetector of normally equal number for monitoring, the photocurrent that these photodetectors read often comprises the noise information of adjoining laser parasitic light.
Step 303, is obtained matrix A, is calculated the real power P of each laser instrument by formula P=AC
i.
Concrete, the method obtaining matrix A is identical with method described in Fig. 1 embodiment of the present invention.Preferably, method described in described matrix A Fig. 1 of the present invention prestores in a register after obtaining, and only directly need call A after recording photocurrent in this step, directly substitutes into the real power P that can calculate each laser instrument in formula P=AC
i.
Method described in application the present embodiment, due to employ calculated each laser instrument to the factor of influence of the photocurrent that other all detectors detect, can the matrix A of linear relationship between truly expressed array laser power and detector array photocurrent, make array laser in use, even if there is channel interference, also the real power of laser instrument is obtained by survey calculation, thus helpful to the output power stablizing this laser instrument.
Accordingly, present invention also offers a kind of device obtaining laser instrument real power in array laser use, described array is 1 × N linear array.In embody rule, be N number of channel side by side, each channel laser instrument, and a corresponding detector detects the photocurrent of this laser instrument to calculate its power, ensures the stable output of laser power.
By with two embodiments, the device of laser instrument real power in acquisition array laser use provided by the invention is described below.It is pointed out that the connecting line between each parts in these two embodiments, do not necessarily represent between each parts and carry out physical connection, also can to represent between each parts interrelated or interactional relation in logic.
Fig. 4 is device embodiment one block diagram of laser instrument real power during acquisition array laser provided by the invention uses, and refers to Fig. 4.
The present embodiment provides a kind of device 4 obtaining linear relationship between array laser power and detector array photocurrent, comprising:
Open unit 41, for opening all N number of laser instruments.
Concrete, in actual applications, be all generally open all N number of laser instruments simultaneously.
Measuring unit 42, for measuring the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N, described photocurrent C
ifor comprising the photocurrent of other N-1 laser instrument parasitic light.
Concrete, described measuring unit 42 is a linear array photodetector, and due to the close together between this N number of laser instrument, therefore the photocurrent that these photodetectors read often comprises the noise information of adjoining laser parasitic light.
Computing unit 43, for obtaining matrix A, and obtains the real power P of each laser instrument by formulae discovery
i.
Concrete, the method obtaining matrix A is identical with method described in Fig. 1 embodiment of the present invention.Preferably, after method described in described matrix A Fig. 1 of the present invention obtains, prestore in a register, computing unit 43 need directly call A, directly substitute into the real power P that can calculate each laser instrument in formula P=AC
i.
Method described in application the present embodiment, due to employ calculated each laser instrument to the factor of influence of the photocurrent that other all detectors detect, can the matrix A of linear relationship between truly expressed array laser power and detector array photocurrent, make array laser in use, even if there is channel interference, also the real power of laser instrument is obtained by survey calculation, thus helpful to the output power stablizing this laser instrument.
Fig. 5 is device embodiment two block diagram of laser instrument real power during acquisition array laser provided by the invention uses, and refers to Fig. 4.
The present embodiment provides a kind of device 5 obtaining linear relationship between array laser power and detector array photocurrent, comprising:
Open unit 51, for opening all N number of laser instruments.
Concrete, to open unit 41 identical with embodiment one, repeats no more herein.
Measuring unit 52, for measuring the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N, described photocurrent C
ifor comprising the photocurrent of other N-1 laser instrument parasitic light.
Concrete, identical with embodiment one measuring unit 42, repeat no more herein.
Storage unit 54, for storage matrix A.
Concrete, the acquisition methods of described matrix A is identical with method described in Fig. 1 embodiment of the present invention.
Computing unit 53, for obtaining matrix A from storage unit 54, and obtains the real power P of each laser instrument by formulae discovery
i.
Concrete, identical with embodiment one computing unit 43, repeat no more herein.
Method described in application the present embodiment, due to employ calculated each laser instrument to the factor of influence of the photocurrent that other all detectors detect, can the matrix A of linear relationship between truly expressed array laser power and detector array photocurrent, make array laser in use, even if there is channel interference, also the real power of laser instrument is obtained by survey calculation, thus helpful to the output power stablizing this laser instrument.
The method of linear relationship and device between the acquisition array laser the power above embodiment of the present invention provided and detector array photocurrent, and obtain array laser use in the method for laser instrument real power and device be described in detail, apply two specific cases herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. obtain a method for linear relationship between array laser power and detector array photocurrent, described array is 1 × N linear array, and described power is P, and described photocurrent is C, and described linear relationship is the matrix A of N × N, it is characterized in that, comprising:
Step one, open a jth laser instrument, other laser instruments are closed condition, and j is 1,2,3 ... N;
Step 2, measures the output power P of a described jth laser instrument
j, and measure the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N;
Step 3, calculates jth by following formula (3) and arranges all element a
ij=C
i/ P
j;
By formula P=AC (1)
Obtain
Turning to system of linear equations is:
Step 4, for the value that j is different, circulation step one to step 3, until N number of laser instrument was opened all one by one, and calculates matrix A
-1whole element a
ij;
Step 5, to matrix A
-1carry out inverse operation and obtain matrix A.
2. obtain a device for linear relationship between array laser power and detector array photocurrent, described array is 1 × N linear array, and described power is P, and described photocurrent is C, and described linear relationship is the matrix A of N × N, it is characterized in that, comprising:
Open unit, for opening a jth laser instrument, other laser instruments are closed condition, and j is 1,2,3 ... N;
Measuring unit, for measuring the output power P of a described jth laser instrument
j, and measure the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N;
Computing unit, arranges all element a for calculating jth by following formula (3)
ij=C
i/ P
j;
By formula P=AC (1)
Obtain
Turning to system of linear equations is:
Control module, for for the different value of j, controls described unlatching unit, measuring unit, computing unit periodic duty, until N number of laser instrument was opened all one by one, and calculates matrix A
- 1whole element a
ij;
Inverse operation unit, for matrix A
- 1carry out inverse operation and obtain matrix A.
3. obtain a method for laser instrument real power in array laser use, described array is 1 × N linear array, it is characterized in that, comprising:
Open all N number of laser instruments;
Measure the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N, described photocurrent C
ifor comprising the photocurrent of other N-1 laser instrument parasitic light;
Obtain the matrix A obtained according to method described in claim 1, calculated the real power P of each laser instrument by formula P=AC
i.
4. method according to claim 3, is characterized in that, described acquisition according to described in claim 1 method obtain matrix A step before, also comprise:
Prestore the matrix A obtained according to method described in claim 1.
5. obtain a device for laser instrument real power in array laser use, described array is 1 × N linear array, it is characterized in that, comprising:
Open unit, for opening all N number of laser instruments;
Measuring unit, for measuring the photocurrent C of N number of detector respectively
i, i is 1,2,3 ... N, described photocurrent C
ifor comprising the photocurrent of other N-1 laser instrument parasitic light;
Computing unit, for obtaining the matrix A obtained according to method described in claim 1, and calculates the real power P of each laser instrument by formula P=AC
i.
6. device according to claim 5, is characterized in that, also comprises:
Storage unit, for storing the matrix A obtained according to method described in claim 1.
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| CN115941110A (en) * | 2022-11-18 | 2023-04-07 | 光彩芯辰(浙江)科技有限公司 | Method for reducing optical wave crosstalk of optical module |
| CN115941110B (en) * | 2022-11-18 | 2023-10-13 | 光彩芯辰(浙江)科技有限公司 | Method for reducing optical crosstalk of optical module |
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| CN104897373B (en) | 2018-10-23 |
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