CN105043721B - The extinction ratio measurement system and measuring method of optical module transmitting terminal - Google Patents
The extinction ratio measurement system and measuring method of optical module transmitting terminal Download PDFInfo
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- CN105043721B CN105043721B CN201510381838.4A CN201510381838A CN105043721B CN 105043721 B CN105043721 B CN 105043721B CN 201510381838 A CN201510381838 A CN 201510381838A CN 105043721 B CN105043721 B CN 105043721B
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Abstract
The invention discloses a kind of extinction ratio measurement system of optical module transmitting terminal, the measuring system includes：Pattern generator, it sends digital electric signal corresponding to specific pattern to optical module to be measured；Light power meter, it receives the optical signal and measures Output optical power value corresponding to the optical signal；Controller, it is communicatively connected to the optical module to be measured, pattern generator, light power meter, wherein, when the controller controls the luminous power automatic control circuit to be in non-working condition, control pattern generator and light power meter work, the controller is calculated based on the Output optical power value that light power meter measurement is drawn, to obtain the Extinction ratio of optical module transmitting terminal to be measured.The invention also discloses the measuring method using the measuring system.The present invention provides a kind of extinction ratio measurement system of optical module transmitting terminal, and for the special extinction ratio tester in traditional measuring system, it has, and equipment is simple, and measurement accuracy is high, the cheap effect of cost.
Description
Technical field
The present invention relates to a kind of measuring system used in the case of optical module dispatches from the factory parametric test.More specifically, originally
Invention be related to it is a kind of used in optical module dispatch from the factory before the extinction ratio parameter of its transmitting terminal is tested in the case of the optical module that uses
The extinction ratio measurement system and measuring method of transmitting terminal.
Background technology
Optical module is made up of opto-electronic device, functional circuit and optical interface etc., and opto-electronic device includes transmitting and received
Two parts.Emitting portion is：The electric signal for inputting a constant bit rate drives semiconductor laser after the driving chip processing of inside
Or light emitting diode launches the modulated optical signal of respective rate, its inside carries luminous power automatic control circuit, makes output
Optical signal power keeps stable.Receiving portion is：Be converted to after the optical signal input module of one constant bit rate by optical detection diode
Electric signal.The electric signal of phase code rate is exported after preamplifier；Briefly, the effect of optical module is exactly opto-electronic conversion,
Transmitting terminal converts electrical signals into optical signal, and after being transmitted by optical fiber, optical signal is converted into electric signal by receiving terminal again.
Laser diode is a current device, only when the forward current that it passes through exceedes threshold current it send it is sharp
Light, in order that laser diode speed-sensitive switch works, it is necessary to which the DC bias current slightly larger than threshold current is added to it.Due to
Need electrical modulation signal being converted to light modulating signal, therefore driver it is also required to provide modulation electric current, modulate sense of current
Change with the change of input electrical signal.The basic optical parameter of optical module includes average light power AOP and Extinction ratio.Average light
Power refers to that light work done calculation formula within the unit interval is as follows：AOP=(P1+P0)/2.Extinction ratio refers to put down when complete " 1 "
The ratio between average light power P0, can be represented, definition such as ER=P1/P0 with ER when equal luminous power P1 and entirely " 0 ".
Optical module needs to measure the important parameter average light power in its optical parameter and extinction ratio when dispatching from the factory, with
Determine if to meet factory calibration, and difference is measured to average light power in the optical parameter of optical module and extinction ratio at present
Completed using power meter and special extinction ratio tester, wherein power meter is cheap, and extinction ratio tester instrument
Although measurement accuracy can reach requirement, its device structure is complicated and expensive.
The content of the invention
It is an object of the invention to solve at least the above and/or defect, and provide at least will be described later it is excellent
Point.
It is a still further object of the present invention to provide a kind of extinction ratio measurement system of optical module transmitting terminal, relative to traditional
For special extinction ratio tester in measuring system, it has, and equipment is simple, and measurement accuracy is high, the cheap effect of cost.
A further object of the invention is by providing a kind of measurement side of the extinction ratio measurement system of optical module transmitting terminal
Method, because its measuring method is simple, to obtain the efficiency preferably measured, while provide a kind of calibration side of the measuring method
Method, strong with controllability to ensure its measurement accuracy, the high effect of measurement accuracy.
In order to realize according to object of the present invention and further advantage, there is provided a kind of extinction ratio of optical module transmitting terminal
Measuring system, luminous power automatic control circuit is provided with the transmitting terminal of the optical module, the measuring system includes：
Pattern generator, it sends digital electric signal corresponding to specific pattern to optical module to be measured, to drive optical mode to be measured
Block launches corresponding optical signal；
Light power meter, it receives the optical signal and measures Output optical power value corresponding to the optical signal；
Controller, it is communicatively connected to the optical module to be measured, pattern generator, light power meter, wherein, when the control
When the device control luminous power automatic control circuit is in non-working condition, pattern generator and light power meter work, institute are controlled
State controller to be calculated based on the Output optical power value that light power meter measurement is drawn, to obtain disappearing for optical module transmitting terminal to be measured
Light compares ER.
Preferably, wherein, the exponent number of the specific pattern is N, during the value of the N is 7,9,11,15,20,23,31
Any one numerical value, wherein, the exponent number N of the specific pattern is referred to by the controller according to different optical mode block types
It is fixed.
Preferably, wherein, the specific pattern includes " 0 " and " 1 " proportion in the first pattern, the second pattern and code stream
Identical standard PRBS patterns, the binary sequence that code stream corresponding to first pattern combines for N number of " 0 " with 1 " 1 ", institute
It is the binary sequence that N number of " 1 " is combined with 1 " 0 " to state code stream corresponding to the second pattern.
The purpose of the present invention can also be further by being measured using extinction ratio measurement system to the extinction ratio of optical module
Method realize, it is characterised in that comprise the following steps：
When step 1, controller control that luminous power automatic control circuit is in non-working condition in optical module to be measured, to code
Type generator is sequentially sent respectively to be believed comprising " 0 " in specific pattern order information and specific pattern code stream and " 1 " proportion
The first control signal, the second control signal of breath；
Step 2, pattern generator are pressed based on the first control signal, the second control signal that receive to optical module to be measured
Sequencing sends the first corresponding digital electric signal, the second digital electric signal respectively, to drive optical module to be generated and transmitted by
Corresponding two optical signals；
Step 3, light power meter receive described two optical signals, and the first numeral electricity is being received to treat light-metering module
The numerical value for launching average light power AOP0, AOP1 of optical signal when signal, the second digital electric signal measures；
Step 4, controller read average light power AOP0, AOP1 that light power meter measures numerical value, and according to following
Formula calculates, to obtain the Extinction ratio of the optical module to be measured,
Preferably, wherein, in step 1, the first control signal that the controller is sent to pattern generator is to make
Pattern generator produces the control signal of corresponding with the first pattern the first digital electric signal, and the controller is to pattern generator
The second control signal sent is the control signal for making pattern generator produce the second digital electric signal corresponding with the second pattern.
Preferably, wherein, it is further comprising the steps of：
Step 5, controller are sent comprising in specific pattern order information and specific pattern code stream " 0 " to pattern generator
With the 3rd control signal of " 1 " proportion information, the pattern generator is based on the 3rd control signal to optical module to be measured transmission pair
The 3rd digital electric signal answered, and the optical module to be measured is obtained in three digital electric signal by light power meter measurement
Launch the average light power AOP of optical signal numerical value；
Step 6, controller reads its average light power AOP measured numerical value to light power meter, and is based on this numerical value
With the value of optical module Extinction ratio to be measured obtained in step 4, calculated according to below equation under the pattern that code stream is complete " 0 "
Average light power P0 value and code stream be complete " 1 " pattern under average light power P1 value,
Step 7, controller are exported flat based on optical module to be measured under the first digital electric signal, the second digital electric signal
P0, P1 for being calculated in equal luminous power AOP0, AOP1 and step 6 value, light-metering is treated after drawing calibration according to below equation
The Extinction ratio ＇ of module,
Preferably, wherein, the 3rd control signal that the controller is sent to pattern generator is to make pattern generator
Produce the control signal of the 3rd digital electric signal corresponding with the standard PRBS patterns.
The present invention comprises at least following beneficial effect：First, because its measuring system uses pattern generator and luminous power
Meter coordinates to realize that the extinction ratio for treating transmitting terminal in light-metering module measures, and it is relative to traditional special delustring of use
Measured than tester for the extinction ratio of optical module transmitting terminal, simple with equipment, cost is cheap and tests simple effect.
Second, using the method that is measured to the extinction ratio of optical module transmitting terminal of measuring system in the present invention, its
In measurement process, because it needs to send two groups of control signals by controller, so that pattern generator produces specific pattern, and
The specific pattern ensure that optical module data transfer is rational simultaneously, and infinite tendency is complete again for its code stream " 0 " and it is complete " 1 " code
Stream, and then cause the average light power AOP that the measurement of light power meter obtains infinitely to receive P0 and P1, therefore controller only needs to lead to
The measurement that simple division arithmetic can be achieved with Extinction ratio is crossed, there is measurement simply, the controllable effect of precision.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the structural representation of the extinction ratio measurement system of optical module transmitting terminal in one embodiment of the present of invention；
Fig. 2 is the measuring method of the extinction ratio measurement system using optical module transmitting terminal in one embodiment of the present of invention
When, pattern generator produces in the code stream of specific pattern ' 1 ' optical module eye pattern when being much larger than ' 0 '；
Fig. 3 is the measuring method of the extinction ratio measurement system using optical module transmitting terminal in an alternative embodiment of the invention
When, pattern generator produces in the code stream of specific pattern ' 0 ' optical module eye pattern when being much larger than ' 1 '；
Fig. 4 is data in the measuring method of the extinction ratio measurement system of optical module transmitting terminal in one embodiment of the present of invention
Process chart.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of individual other elements or its combination.
Fig. 1 shows a kind of way of realization of the extinction ratio measurement system of optical module transmitting terminal according to the present invention, described
Luminous power automatic control circuit is provided with optical module transmitting terminal, wherein the measuring system includes：
Pattern generator 1, it sends digital electric signal corresponding to specific pattern to optical module 2 to be measured, and light-metering is treated with driving
Module launches corresponding optical signal；
Light power meter 3, it receives the optical signal and measures Output optical power value corresponding to the optical signal；
Controller 4, it is communicatively connected to the optical module to be measured, pattern generator, light power meter, wherein, when the control
When the device control processed luminous power automatic control circuit is in non-working condition, pattern generator and light power meter work are controlled,
The controller is calculated based on the Output optical power value that light power meter measurement is drawn, to obtain optical module transmitting terminal to be measured
Extinction ratio.
The controller is used to control pattern generator to send specific pattern, control luminous power in optical module to automatically control electricity
The working condition on road and the result for reading light power meter measurement.Realized using the measuring system of this programme and treat light-metering module hair
The extinction ratio for penetrating end measures, and because it uses pattern generator and light power meter to coordinate to measure extinction ratio, it is relative to biography
The special extinction ratio tester of use of system realizes for optical module transmitting terminal extinction ratio measurement that it is ensureing the same of measurement accuracy
When, equipment simple benefit cheap with cost.Also, this mode is a kind of explanation of preferred embodiments, but not
It is confined to this.
In another example, the exponent number of the specific pattern is N, and the value of the N is 7,9,11,15,20,23,31
In any one numerical value, wherein, the exponent number N of the specific pattern is carried out by the controller according to different optical mode block types
Specify.Targetedly different types of optical module is made a distinction using this scheme so that different types of optical module is equal
There is suitable pattern to match with it, to obtain more accurate measurement effect and precision, have applied widely, controllability is strong,
Data transmission credibility is good, the benefit of measurement accuracy degree.Also, this mode is a kind of explanation of preferred embodiments, but
It is not limited thereto.
In another example, the specific pattern compares including " 0 " and " 1 " in the first pattern, the second pattern and code stream
Weight identical standard PRBS patterns, code stream corresponding to first pattern are the binary sequence that N number of " 0 " is combined with 1 " 1 ",
Code stream corresponding to second pattern is the binary sequence that N number of " 1 " is combined with 1 " 0 ".Using this scheme pattern is sent out
Specific pattern caused by raw device, can level off to complete " 1 " combination or complete " 0 " combination, and then the average light power for measuring it as far as possible
AOP energy infinite approach P0 and P1, to ensure that its measurement result has the benefit of excellent measurement accuracy and reliability.And
And this mode is a kind of explanation of preferred embodiments, but it is not limited thereto.
The purpose of the present invention can also be carried out further by a kind of using extinction ratio measurement system to the extinction ratio of optical module
The method of measurement is realized, is comprised the following steps：
When step 1, controller control that luminous power automatic control circuit is in non-working condition in optical module to be measured, to code
Type generator is sequentially sent respectively to be believed comprising " 0 " in specific pattern order information and specific pattern code stream and " 1 " proportion
The first control signal, the second control signal of breath；
Step 2, pattern generator are pressed based on the first control signal, the second control signal that receive to optical module to be measured
Sequencing sends the first corresponding digital electric signal, the second digital electric signal respectively, to drive optical module to be generated and transmitted by
Corresponding two optical signals；
Step 3, light power meter receive described two optical signals, and the first numeral electricity is being received to treat light-metering module
The numerical value for launching average light power AOP0, AOP1 of optical signal when signal, the second digital electric signal measures；
Step 4, controller read average light power AOP0, AOP1 that light power meter measures numerical value, and according to following
Formula calculates, to obtain the Extinction ratio of the optical module to be measured,
During using this scheme, it is first shut off or the automated power without using luminous power automatic control circuit in optical module
Control function, the specific pattern sent using pattern generator, formed signal ' 1 ' from the unit interval to optical module that sent in and
' 0 ' is uneven so that the average light power AOP deviations P1 or P0 measured.When optical module sends signal ' 1 ' far more than ' 0 '
When, now measure AOP and be approximately equal to P1, when optical module sends signal ' 0 ' far more than ' 1 ', now measure AOP and be approximately equal to P0, by
Extinction ratio calculation formula ER=P1/P0 can calculate extinction ratio.
But because optical module can not transmit complete ' 1 ' or complete ' 0 ' data when NRZ transmits, therefore in test delustring
Than when should according to the suitably specific pattern of type selecting of optical module, such as PRBS7 patterns requirement optical module can pass
The combination of defeated 7 ' 1 ' and 1 ' 0 ' and the combination of 7 ' 0 ' and 1 ' 1 ', the reasonability of transmission data is so ensured that,
The same optical module for the requirement of PRBS31 patterns can transmit 31 ' 1 ' and 1 ' 0 ' combination and 31 ' 0 ' and 1
' 1 ' combination.
In specific implementation process, when controller control pattern generator send ' 1 ' far more than ' 0 ' in specific pattern, example
The pattern such as sent is the combination of N number of ' 1 ' and 1 ' 0 ', then average light powerThenOptical module eye pattern as shown in Figure 2 can be obtained.
In specific implementation process, now controller control pattern generator is sent ' 0 ' far more than ' 1 ' in specific pattern,
Such as the pattern sent is 1 ' 0 ' and N number of ' 0 ' combination.Then average light powerThenOptical module eye pattern that can be as shown in Figure 3.
Can calculate extinction ratio by P1 and P0 isNow if N is infinitely great, thenWherein, AOP1 and AOP1 is light power meter measurement result, then can draw the extinction ratio of optical module to be measured.
In this scheme, it is and specific at this because only needing pattern generator to produce two groups of specific patterns under the control of the controller
When N is infinitely great in the code stream of pattern, the measuring method both can guarantee that optical module transmitted data reasonability, and and can causes luminous power
Measure output average light power AOP of the optical module under two groups of specific patterns is substantially equal to P0 and P1, and then cause optical mode
The extinction ratio of block can simply be calculated by controller can just obtain, and its measuring method data workflow is as shown in figure 4, tool
There is exploitativeness strong, test simple benefit.Also, this mode is a kind of explanation of preferred embodiments, but not office
It is limited to this.
In another example, in step 1, the controller is to the first control signal that pattern generator is sent
Pattern generator is set to produce the control signal of the first digital electric signal corresponding with the first pattern, the controller occurs to pattern
The second control signal that device is sent is the control letter for making pattern generator produce the second digital electric signal corresponding with the second pattern
Number.Pattern generator is controlled to send specific pattern by controller in this scheme, its role is to it is met optical mode
The standard of block data transfer, while the proportion of " 1 " and " 0 " is controllable in its code stream, code stream more level off to complete " 0 " binary sequence or
" 1 " binary sequence entirely, the average light power AOP that its light power meter measures more level off to P0, P1, herein, controller control
Pattern generator produces the first pattern and the sequencing of the second pattern does not require specifically.Light work(is caused using this scheme
The average light power AOP for the optical module that rate measures is controllable, and then the stability of its measurement result and precision can be controllable, has stable
Good, the high benefit of precision of property.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.
In another example, the measuring method of the extinction ratio measurement system of described optical module transmitting terminal, wherein N values are got over
The Extinction ratio calculated greatly is more accurate, and feedback calibration algorithm can be saved when N value meets Extinction ratio measurement accuracy,
But because its N in practical operation value can not possibly be infinitely great, therefore the ER calculated by such scheme has certain error,
Therefore introducing feedback error calibration method is needed to calibrate the above results, data workflow such as Fig. 4 of its calibration method
It is shown, it is specific further comprising the steps of：
Step 5, controller are sent comprising in specific pattern order information and specific pattern code stream " 0 " to pattern generator
With the 3rd control signal of " 1 " proportion information, the pattern generator is based on the 3rd control signal to optical module to be measured transmission pair
The 3rd digital electric signal answered, and the optical module to be measured is obtained in three digital electric signal by light power meter measurement
Launch the average light power AOP of optical signal numerical value；
Step 6, controller reads its average light power AOP measured numerical value to light power meter, and is based on this numerical value
With the value of optical module Extinction ratio to be measured obtained in step 4, calculated according to below equation under the pattern that code stream is complete " 0 "
Average light power P0 value and code stream be complete " 1 " pattern under average light power P1 value,
Step 7, controller are exported flat based on optical module to be measured under the first digital electric signal, the second digital electric signal
P0, P1 for being calculated in equal luminous power AOP0, AOP1 and step 6 value, light-metering is treated after drawing calibration according to below equation
The Extinction ratio ＇ of module,
This scheme is used so that in actual mechanical process, because N value can not reach infinitely great, light-metering is treated for realizing
The Extinction ratio of module is calibrated, so that the Extinction ratio ＇ after calibration is more accurate, with controllability is good, accuracy is high, steady
Qualitative good benefit.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.
In another example, the 3rd control signal that the controller is sent to pattern generator is to make pattern generator
Produce the control signal of the 3rd digital electric signal corresponding with the standard PRBS patterns.Using the standard PRBS in this scheme
Pattern to carry out feedback calibration to optical module, to obtain more excellent measurement accuracy, has reliability high, implements favorably, surely
Qualitative good benefit.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.
Number of devices and treatment scale described herein are the explanations for simplifying the present invention.To the optical module of the present invention
The application of the extinction ratio measurement system and measuring method of transmitting terminal, modifications and variations be to one skilled in the art it is aobvious and
It is clear to.
As described above, according to the present invention, first, because its measuring system is using the cooperation of pattern generator and light power meter
To realize that the extinction ratio for treating transmitting terminal in light-metering module measures, it is relative to traditional special extinction ratio tester of use
Simple with equipment to measure for the extinction ratio of optical module transmitting terminal, cost is cheap and tests simple effect.
Second, using the method that is measured to the extinction ratio of optical module transmitting terminal of measuring system in the present invention, its
In measurement process, because it needs to send two groups of control signals by controller, so that pattern generator produces specific pattern, and
The specific pattern ensure that optical module data transfer is rational simultaneously, and infinite tendency is complete again for its code stream " 0 " and it is complete " 1 " code
Stream, and then cause the average light power AOP that the measurement of light power meter obtains infinitely to receive P0 and P1, therefore controller only needs to lead to
The measurement that simple division arithmetic can be achieved with Extinction ratio is crossed, there is measurement simply, the controllable effect of precision.
Third, using the method that is measured to the extinction ratio of optical module transmitting terminal of measuring system in the present invention, its
In actual measurement process, because N value usually not method realizes infinity, therefore the Extinction ratio that its measurement obtains has error,
A kind of feedback calibration method is thus provided, because that can ensure that its measurement accuracy disclosure satisfy that measurement when actually measuring
It is required that, controllability strong effect good with stability.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With.It can be applied to this various suitable practical field completely., can be easily for those skilled in the art
Realize other modification.Therefore under the universal limited without departing substantially from claim and equivalency range, this is practical and unlimited
In specific details and shown here as the legend with description.
Claims (5)
- Luminous power is provided with 1. a kind of extinction ratio measurement system of optical module transmitting terminal, in the transmitting terminal of the optical module to control automatically Circuit processed, it is characterised in that the measuring system includes：Pattern generator, it sends digital electric signal corresponding to specific pattern to optical module to be measured, to drive optical module to be measured to send out Penetrate corresponding optical signal；Light power meter, it receives the optical signal and measures Output optical power value corresponding to the optical signal；Controller, it is communicatively connected to the optical module to be measured, pattern generator, light power meter, wherein, when the controller control When making the luminous power automatic control circuit and being in non-working condition, pattern generator and light power meter work, the control are controlled Device processed is calculated based on the Output optical power value that light power meter measurement is drawn, to obtain the extinction ratio of optical module transmitting terminal to be measured ER；The exponent number of the specific pattern is N, and the value of the N is any one numerical value in 7,9,11,15,20,23,31, its In, the exponent number N of the specific pattern is specified by the controller according to different optical mode block types, the specific pattern bag " 0 " and " 1 " proportion identical standard PRBS patterns in the first pattern, the second pattern and code stream are included, first pattern is corresponding Code stream be N number of " 0 " binary sequence for combine with 1 " 1 ", code stream corresponding to second pattern is N number of " 1 " and 1 " 0 " The binary sequence of combination.
- 2. a kind of extinction ratio measurement system using optical module transmitting terminal as claimed in claim 1 is carried out to optical module extinction ratio The method of measurement, it is characterised in that comprise the following steps：When step 1, controller control that luminous power automatic control circuit be in non-working condition in optical module to be measured, to pattern hair Raw device is sequentially sent comprising " 0 " in specific pattern order information and specific pattern code stream and " 1 " proportion information respectively First control signal, the second control signal；Step 2, pattern generator is based on the first control signal, the second control signal received, to optical module to be measured by successively Order sends the first corresponding digital electric signal, the second digital electric signal respectively, to drive optical module to be measured to be generated and transmitted by Corresponding two optical signals；Step 3, light power meter receive described two optical signals, with treat light-metering module receive first digital electric signal, The numerical value for launching average light power AOP0, AOP1 of optical signal during the second digital electric signal measures；Step 4, controller read average light power AOP0, AOP1 that light power meter measures numerical value, and according to below equation Calculate, to obtain the Extinction ratio of the optical module to be measured,<mrow> <mi>E</mi> <mi>R</mi> <mo>=</mo> <mfrac> <mtable> <mtr> <mtd> <mrow> <mi>A</mi> <mi>O</mi> <mi>P</mi> </mrow> </mtd> <mtd> <mn>1</mn> </mtd> </mtr> </mtable> <mtable> <mtr> <mtd> <mrow> <mi>A</mi> <mi>O</mi> <mi>P</mi> </mrow> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> </mtable> </mfrac> <mo>.</mo> </mrow>
- 3. the method measured as claimed in claim 2 to optical module extinction ratio, it is characterised in that in step 1, institute It is pattern generator is produced corresponding with the first pattern first that controller, which is stated, to the first control signal that pattern generator is sent The control signal of digital electric signal, the second control signal that the controller is sent to pattern generator is to produce pattern generator The control signal of raw the second digital electric signal corresponding with the second pattern.
- 4. the method measured as claimed in claim 3 to optical module extinction ratio, it is characterised in that also including following step Suddenly：Step 5, controller are sent comprising " 0 " and " 1 " in specific pattern order information and specific pattern code stream to pattern generator 3rd control signal of proportion information, the pattern generator be based on the 3rd control signal to optical module to be measured send corresponding to the Three digital electric signals, and the optical module to be measured is obtained by light power meter measurement and launches light in three digital electric signal The average light power AOP of signal numerical value；Step 6, controller reads its average light power AOP measured numerical value to light power meter, and is based on this numerical value and step The value of the optical module Extinction ratio to be measured obtained in rapid four, calculated according to below equation average under the pattern that code stream is complete " 0 " Luminous power P0 value and code stream be complete " 1 " pattern under average light power P1 value,<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>E</mi> <mi>R</mi> <mo>=</mo> <mfrac> <mrow> <mi>P</mi> <mn>1</mn> </mrow> <mrow> <mi>P</mi> <mn>0</mn> </mrow> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mn>2</mn> <mo>*</mo> <mi>A</mi> <mi>O</mi> <mi>P</mi> <mo>=</mo> <mi>P</mi> <mn>1</mn> <mo>+</mo> <mi>P</mi> <mn>0</mn> </mrow> </mtd> </mtr> </mtable> </mfenced>Step 7, the average light that controller is exported based on optical module to be measured under the first digital electric signal, the second digital electric signal P0, P1 for being calculated in power AOP0, AOP1 and step 6 value, optical module to be measured after calibration is drawn according to below equation Extinction ratio ＇,<mrow> <msup> <mi>ER</mi> <mo>&prime;</mo> </msup> <mo>=</mo> <mfrac> <mrow> <mi>A</mi> <mi>O</mi> <mi>P</mi> <mn>1</mn> <mo>-</mo> <mfrac> <mrow> <mi>P</mi> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>+</mo> <mn>1</mn> </mrow> </mfrac> </mrow> <mrow> <mi>A</mi> <mi>O</mi> <mi>P</mi> <mn>0</mn> <mo>-</mo> <mfrac> <mrow> <mi>P</mi> <mn>1</mn> </mrow> <mrow> <mi>N</mi> <mo>+</mo> <mn>1</mn> </mrow> </mfrac> </mrow> </mfrac> <mo>.</mo> </mrow>
- 5. the method measured as claimed in claim 4 to optical module extinction ratio, it is characterised in that the controller is to code The 3rd control signal that type generator is sent is pattern generator is produced the 3rd numeral corresponding with the standard PRBS patterns The control signal of electric signal.
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| CN105547643A (en) * | 2015-12-14 | 2016-05-04 | 曙光信息产业(北京)有限公司 | Optical-electric module detection method |
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| CN111740783B (en) * | 2020-05-12 | 2021-07-06 | 杭州兰特普光电子技术有限公司 | Automatic calibration system and method for adjustable laser with protection |
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