CN106992811A - The method of testing and system of optical modulation amplitude value in receiving sensitivity measurement - Google Patents

The method of testing and system of optical modulation amplitude value in receiving sensitivity measurement Download PDF

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CN106992811A
CN106992811A CN201610038586.XA CN201610038586A CN106992811A CN 106992811 A CN106992811 A CN 106992811A CN 201610038586 A CN201610038586 A CN 201610038586A CN 106992811 A CN106992811 A CN 106992811A
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power
optical
measured
modulation amplitude
input
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CN106992811B (en
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沈百林
武成宾
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0799—Monitoring line transmitter or line receiver equipment

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

The method of testing and system of optical modulation amplitude value in a kind of receiving sensitivity measurement；The method of testing includes：The receiving sensitivity of optical module to be measured is measured, the receiving sensitivity is recorded as the first power；After adjustment is input in input optical power to the predetermined power interval of the optical module receiving terminal to be measured, the input optical power is recorded as the second power, and measure the second optical modulation amplitude；By second optical modulation amplitude divided by the second power, it is multiplied by the first power and obtains the first optical modulation amplitude in receiving sensitivity measurement.The present invention provides a kind of testing scheme of optical modulation amplitude value in improved receiving sensitivity measurement.

Description

The method of testing and system of optical modulation amplitude value in receiving sensitivity measurement
Technical field
The present invention relates to optical modulation amplitude value in optical communication field, more particularly to a kind of measurement of receiving sensitivity Method of testing and system.
Background technology
When assessing Ethernet optical interface signal transmission capabilities, generally require to consider receiving sensitivity parameter Test, is based especially on optical modulation amplitude and is estimated.For non-return-to-zero signal, optical modulation amplitude is fixed Justice is high level signal and the difference power of low level signal.But when with oscilloscope measurement input optical signal, Measuring accuracy suffers from the influence of input optical power size, and input optical power is smaller, and test error is bigger, Its optical modulation amplitude can not be immediately arrived at when measuring receiving sensitivity, conventional method is disappeared by measuring it Light ratio, recycling formula to calculate corresponding OMA, (Optical Modulation Amplitude, light is adjusted Amplitude processed), formula specific as follows：
Wherein, SENOMAThe linear value of optical modulation amplitude in being measured for receiving sensitivity, SEN is reception The linear value of sensitivity, ER is the decibel value of extinction ratio, it is seen that it is tested thinking and received for test first Sensitivity, then using extinction ratio parameter, then calculates optical modulation amplitude when measuring receiving sensitivity.
Although the above method solves the test of the receiving sensitivity optical modulation amplitude value of non-return-to-zero signal, but It is to calculate slightly more complex, and is related to the measurement of intermediate parameters extinction ratio, and if being related to high order modulation, example Such as four level pulse amplitude modulation(PAM)s, calculation formula needs to redesign.It is existing it is therefore desirable to study and improve There is method of testing.
The content of the invention
The present invention provides a kind of testing scheme of optical modulation amplitude value in improved receiving sensitivity measurement.
In order to solve the above problems, the present invention is adopted the following technical scheme that.
The method of testing of optical modulation amplitude value in a kind of receiving sensitivity measurement, including：
The receiving sensitivity of optical module to be measured is measured, the receiving sensitivity is recorded as the first power；
Adjustment is input in input optical power to the predetermined power interval of the optical module receiving terminal to be measured Afterwards, the input optical power is recorded as the second power, and measures the second optical modulation amplitude；
By second optical modulation amplitude divided by the second power, it is multiplied by the first power and obtains receiving sensitivity survey The first optical modulation amplitude in amount.
Alternatively, the second optical modulation amplitude of the measurement includes：
The optical modulation amplitude of the receiving terminal of the optical module to be measured is measured using optical Oscilloscope, described the is used as Two optical modulation amplitudes.
Alternatively, the predetermined power interval is the power measurement scope of the optical Oscilloscope；
Or, the predetermined power interval is located in the range of the power measurement of the optical Oscilloscope.
Alternatively, the receiving sensitivity of the measurement optical module to be measured includes：
The input optical power for being input to the optical module receiving terminal to be measured is adjusted in the way of from big to small, When the BER of the optical module to be measured reaches the first predetermined threshold, measured using light power meter The input optical power of the receiving terminal of the optical module to be measured, the reception for obtaining the optical module to be measured is sensitive Degree.
Alternatively, the input optical power that the adjustment is input to the optical module receiving terminal to be measured includes：
What regulation was arranged between reference transmitter transmitting terminal and the optical module receiving terminal to be measured adjustable declines Subtract device, to improve or reduce the input optical power for being input to the optical module receiving terminal to be measured.
Alternatively, it is described by second optical modulation amplitude divided by the second power, it is multiplied by the first power and obtains The first optical modulation amplitude in receiving sensitivity measurement includes：
First power, the second power, the second optical modulation amplitude are converted into corresponding dBm；
After conversion, by second optical modulation amplitude subtract difference power obtain in receiving sensitivity measurement the One optical modulation amplitude；The difference power is that second power subtracts first power.
The test system of optical modulation amplitude value in a kind of receiving sensitivity measurement, including：Reference transmitter, It is arranged on adjustable attenuator between reference transmitter transmitting terminal and optical module receiving terminal to be measured, luminous power Meter, optical Oscilloscope, control device；
The control device is used to adjust the adjustable attenuator to measure the reception of the optical module to be measured Sensitivity, the receiving sensitivity that the light power meter is measured is recorded as the first power；It is described for adjusting Adjustable attenuator, makes to be input to the input optical power of the optical module receiving terminal to be measured to predetermined power area After interior, the input optical power that the light power meter is measured is recorded as the second power, and shows from the light Ripple device obtains the second optical modulation amplitude；By second optical modulation amplitude divided by the second power, first is multiplied by Power obtains the first optical modulation amplitude in receiving sensitivity measurement.
Alternatively, the predetermined power interval is the power measurement scope of the optical Oscilloscope；
Or, the predetermined power interval is located in the range of the power measurement of the optical Oscilloscope.
Alternatively, described test system also includes：
Error analyzer, the BER for measuring the optical module to be measured；
The control device is sensitive for adjusting reception of the adjustable attenuator to measure optical module to be measured Degree includes：
The control device adjusts the adjustable attenuator, makes to be input to the optical module receiving terminal to be measured Input optical power changes in the way of from big to small, the bit measured until the error analyzer When error rate reaches the first predetermined threshold, the optical module to be measured that the light power meter is measured is recorded The input optical power of receiving terminal, obtains the receiving sensitivity of the optical module to be measured.
Alternatively, second optical modulation amplitude divided by the second power are multiplied by first by the control device The first optical modulation amplitude that power is obtained in receiving sensitivity measurement includes：
The control device is converted to first power, the second power, the second optical modulation amplitude accordingly DBm；After conversion, second optical modulation amplitude is subtracted into difference power and obtains receiving sensitivity survey The first optical modulation amplitude in amount；The difference power is that second power subtracts first power.
, compared with prior art, can using optical modulation amplitude testing scheme provided in an embodiment of the present invention The test compared with optical modulation amplitude value under low optical power is realized, testing procedure is simple, and the calculating of complexity is not related to, Suitable for the test of non-return-to-zero signal, and it can be suitably used for the survey of four level pulse am signals Examination, while ensure that measuring accuracy.
Other features and advantages of the present invention will be illustrated in the following description, also, partly from froming the perspective of Become apparent, or understood by implementing the present invention in bright book.The purpose of the present invention is excellent with other Point can be realized and obtained by specifically noted structure in specification, claims and accompanying drawing .
Brief description of the drawings
Accompanying drawing is used for providing further understanding technical solution of the present invention, and constitutes one of specification Point, it is used to explain technical scheme together with embodiments herein, does not constitute to the present invention The limitation of technical scheme.
The flow of the method for testing of optical modulation amplitude value during Fig. 1 measures for the receiving sensitivity of embodiment one Schematic diagram；
Fig. 2 is the hardware system block diagram in the example of embodiment one；
Fig. 3 is the schematic flow sheet of the example of embodiment one；
The block diagram of the test system of optical modulation amplitude value during Fig. 4 measures for the receiving sensitivity of embodiment two.
Embodiment
Technical scheme is described in detail below in conjunction with drawings and Examples.
If it should be noted that not conflicting, each feature in the embodiment of the present invention and embodiment can To be combined with each other, within protection scope of the present invention.Patrolled in addition, though showing in flow charts Volume order, but in some cases, can be shown or described to be performed different from order herein Step.
The method of testing of optical modulation amplitude value in embodiment one, a kind of measurement of receiving sensitivity, such as Fig. 1 institutes Show, including step S110~S130：
S110, measurement optical module to be measured receiving sensitivity, the first work(is recorded as by the receiving sensitivity Rate；
S120, adjustment are input to the input optical power of the optical module receiving terminal to be measured to predetermined power area After interior, the input optical power is recorded as the second power, and measure the second optical modulation amplitude；
S130, by second optical modulation amplitude divided by the second power, be multiplied by the first power obtain receive spirit The first optical modulation amplitude in sensitivity measurement.
In the present embodiment, S120 and S110 succession can not be limited.Due to needing to survey in S110 Receiving sensitivity is measured, and needs to measure the input optical power in optical modulation amplitude, therefore S110 in S120 Certainly less than the input optical power in S120；Can be first to carry out S110 (if input light work(during test Rate is improper, then untill being adjusted to suitable), then tune up input optical power carry out S120 or S120 (if input optical power is improper, untill being adjusted to suitable) is first carried out, then turns input down Luminous power carries out S110.
In the present embodiment, for S110, suitable input optical power is small enough to be suitable to measure to receive sensitive The input optical power of degree；For S120, suitable input optical power is small enough to be suitable to measurement light modulation width The input optical power of degree.
Alternatively, the second optical modulation amplitude of the measurement includes：
The optical modulation amplitude of the receiving terminal of the optical module to be measured is measured using optical Oscilloscope, described the is used as Two optical modulation amplitudes.
In other alternatives, it would however also be possible to employ other every measurement optical modulation amplitudes.
In this alternative, the predetermined power interval is the power measurement scope of the optical Oscilloscope；
Or, the predetermined power interval is located in the range of the power measurement of the optical Oscilloscope.
Such as, the power measurement scope of optical Oscilloscope is Px~Py, including Px and Py, wherein Py big In Px；The predetermined power interval can be directly disposed as the power measurement scope, i.e.,：Px~Py, Including Px and Py；The predetermined power interval can also fall in the range of power measurement, i.e., predetermined The higher limit of power interval is less than or equal to Py, and lower limit is more than or equal to Px.
In other alternatives, the predetermined power interval can also be set according to actual conditions.
Alternatively, the receiving sensitivity of the measurement optical module to be measured includes：
The input optical power for being input to the optical module receiving terminal to be measured is adjusted in the way of from big to small, When the BER of the optical module to be measured reaches the first predetermined threshold, measured using light power meter The input optical power of the receiving terminal of the optical module to be measured, the reception for obtaining the optical module to be measured is sensitive Degree.
In other alternatives, it would however also be possible to employ other modes measure receiving sensitivity.
Alternatively, the input optical power that the adjustment is input to the optical module receiving terminal to be measured includes：
What regulation was arranged between reference transmitter transmitting terminal and the optical module receiving terminal to be measured adjustable declines Subtract device, to improve or reduce the input optical power for being input to the optical module receiving terminal to be measured.
In other alternatives, it would however also be possible to employ other manner regulation is input to the optical module to be measured and received The input optical power at end.
Alternatively, it is described by second optical modulation amplitude divided by the second power, it is multiplied by the first power and obtains The first optical modulation amplitude in receiving sensitivity measurement includes：
First power, the second power, the second optical modulation amplitude are converted into corresponding dBm；
After conversion, by second optical modulation amplitude subtract difference power obtain in receiving sensitivity measurement the One optical modulation amplitude；The difference power is that second power subtracts first power.
Multiplication and division computing is converted into plus and minus calculation in this alternative, computation complexity is reduce further.
In one example of the present embodiment, the corresponding hardware system test block diagram of method of testing such as Fig. 2 It is shown, including：Error analyzer, reference transmitter, optical module receiving portion Rx to be measured is adjustable to decline Subtract device, and optical Oscilloscope and light power meter.Error analyzer outputs signal to reference transmitter, then The output signal of reference transmitter inputs to optical module receiving portion to be measured after adjustable attenuator, finally Into the receiving portion of error analyzer.Light adjustable attenuator output end configures light power meter and optical Oscilloscope It is monitored.
In this example, the flow of method of testing is as follows described in reference picture 3, including step 101~103：
Step 101：Measure receiving sensitivity PL；
Step 101 may include：
Adjustable attenuator is adjusted, makes the input optical power for being input to optical module receiving terminal to be measured by gradually subtracting greatly It is small, until BER that Error Detector is monitored gradually increases and reaches defined value, use light power meter Measure the input optical power of now optical module to be measured, the pressurization receiving sensitivity P of optical module as to be measuredL； PLI.e. described first power；
Receiving sensitivity measuring method can be found in correlation technique.
Step 102：Increase input optical power to the OK range of optical Oscilloscope specification, measure input light work( Rate PHWith corresponding optical modulation amplitude OMAH；
Step 102 may include：
Adjustable attenuator is adjusted, makes the input optical power of optical Oscilloscope suitable, record input optical power PH, PHI.e. described second power；The second optical modulation amplitude OMA is tested with optical OscilloscopeH, optical Oscilloscope work( Rate measurement can be eliminated if any error by light power meter comparison calibration；
Optical Oscilloscope often has strict requirements in test to input optical power, only works as input optical power In measurement range, optical Oscilloscope could accurately measure optical modulation amplitude, so in relatively low input optical power When, such as light oscilloscope measurement optical modulation amplitude cannot be used simultaneously when measuring receiving sensitivity.
Step 103：Calculate the optical modulation amplitude in receiving sensitivity measurement：
OMAL=OMAH-(PH-PL)。
Parameter units are dBm dBm in above-mentioned steps.
The method of testing of the present embodiment is similarly applied to test pressurization receiving sensitivity optical modulation amplitude, Error analyzer needs to have signal pressurization function, and optical Oscilloscope can be supervised before test pressurization receiving sensitivity Survey pressurization signal quality.
The general principle of optical modulation amplitude method of testing in receiving sensitivity measurement described in the present embodiment, below It is illustrated by taking nonreturn to zero code signal as an example.
The power of secondary signal and the first signal is respectively P1 and P0 during setting measurement receiving sensitivity, then Mean power PLLinear value is 0.5 × (P1+P0).
Extinction ratio is set as ER, there is ER=P1/P0.Notice that adjustment adjustable attenuator changes signal light power Do not influence extinction ratio.So PL=0.5 × (P1+P1/ER).Then there is P1=k0 × PL, wherein k0 is Constant.
Increase after input optical power, be set in input optical power for (the i.e. input of optical Oscilloscope of the second power Luminous power is in the range of predetermined power) when secondary signal and the power of the first signal be respectively P11 and P00, Then mean power PHLinear value is 0.5 × (P11+P00), similarly there is P11=k0 × PH。
The corresponding optical modulation amplitude of two kinds of power is calculated respectively：
OMAL=P1-P0=P1-P1/ER=k0 × PL× (1-1/ER)=k × PL；
OMAH=P11-P00=P11-P11/ER=k0 × PH× (1-1/ER)=k × PH；
It is not difficult to draw OMA from two formulas aboveL=OMAH/PH×PL。
If above-mentioned parameter is converted into dBm for unit, there is OMAL=OMAH-(PH-PL)。
The derivation of above test philosophy is based on nonreturn to zero code signal, is similarly adjusted suitable for four level pulse amplitudes The test of signal processed, it is specific as follows：
When measuring receiving sensitivity：PL=0.25 × (P0+P1+P2+P3).
P0, P1, P2, P3 are respectively the first signal level, the secondary signal when measuring receiving sensitivity Level, the 3rd signal level and the 4th signal level.
When input optical power is suitable：PH=0.25 × (P00+P11+P22+P33).
P00, P11, P22, P33 are respectively the first signal level when input optical power is suitable, second Signal level, the 3rd signal level and the 4th signal level.
It is assumed that the OMA minimum values of four level pulse am signals are the 3rd signal level P22 and the Binary signal level P11 difference, that is, have OMAH=P22-P11.
It is not difficult to draw：OMAH=P22-P11=k0 × (P22+P11)=k × PH.Similarly there is OMAL=k ×PL。
Therefore OMAL=OMAH/PH×PL.Be converted to dBm, i.e. OMAL=OMAH-(PH-PL)。
The test system of optical modulation amplitude value in embodiment two, a kind of measurement of receiving sensitivity, such as Fig. 3 institutes Show, including：Reference transmitter 31, it is arranged on reference transmitter transmitting terminal and optical module to be measured 30 is received Adjustable attenuator 32, light power meter 33, optical Oscilloscope 34, control device 35 between end；
The control device 35 is used to adjust the adjustable attenuator 32 to measure the optical module to be measured 30 receiving sensitivity, the receiving sensitivity that the light power meter 33 is measured is recorded as the first power； For adjusting the adjustable attenuator 32, make the input light for being input to the receiving terminal of optical module to be measured 30 After in power to predetermined power interval, the input optical power that the light power meter 33 is measured is recorded as Second power, and obtain the second optical modulation amplitude from the optical Oscilloscope 34；By second light modulation Amplitude divided by the second power, be multiplied by the first power obtain receiving sensitivity measurement in the first light modulation width Degree.
In other embodiments, all or part of operation of the control device 35 can also be performed by people.
Alternatively, the predetermined power interval is the power measurement scope of the optical Oscilloscope；
Or, the predetermined power interval is located in the range of the power measurement of the optical Oscilloscope.
Alternatively, described test system also includes：
Error analyzer, the BER for measuring the optical module to be measured；
The control device is sensitive for adjusting reception of the adjustable attenuator to measure optical module to be measured Degree includes：
The control device adjusts the adjustable attenuator, makes to be input to the optical module receiving terminal to be measured Input optical power changes in the way of from big to small, the bit measured until the error analyzer When error rate reaches the first predetermined threshold, the optical module to be measured that the light power meter is measured is recorded The input optical power of receiving terminal, obtains the receiving sensitivity of the optical module to be measured.
Alternatively, second optical modulation amplitude divided by the second power are multiplied by first by the control device The first optical modulation amplitude that power is obtained in receiving sensitivity measurement includes：
The control device is converted to first power, the second power, the second optical modulation amplitude accordingly DBm；After conversion, second optical modulation amplitude is subtracted into difference power and obtains receiving sensitivity survey The first optical modulation amplitude in amount；The difference power is that second power subtracts first power.
Other implementation details can be found in embodiment one.
One of ordinary skill in the art will appreciate that all or part of step in the above method can pass through journey Sequence instructs related hardware to complete, and described program can be stored in computer-readable recording medium, such as only Read memory, disk or CD etc..Alternatively, all or part of step of above-described embodiment can also make Realized with one or more integrated circuits.Correspondingly, each module/unit in above-described embodiment can be with Realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The present invention is not limited In the combination of the hardware and software of any particular form.
Although disclosed herein embodiment as above, described content is only to readily appreciate the present invention And the embodiment used, it is not limited to the present invention.Technology people in any art of the present invention Member, do not depart from disclosed herein spirit and scope on the premise of, can be in the form of implementation and thin Any modification and change, but the scope of patent protection of the present invention are carried out on section, still must be with appended right The scope that claim is defined is defined.

Claims (10)

1. the method for testing of optical modulation amplitude value in a kind of receiving sensitivity measurement, including：
The receiving sensitivity of optical module to be measured is measured, the receiving sensitivity is recorded as the first power；
Adjustment is input in input optical power to the predetermined power interval of the optical module receiving terminal to be measured Afterwards, the input optical power is recorded as the second power, and measures the second optical modulation amplitude；
By second optical modulation amplitude divided by the second power, it is multiplied by the first power and obtains receiving sensitivity survey The first optical modulation amplitude in amount.
2. method of testing as claimed in claim 1, it is characterised in that the light modulation of measurement second Amplitude includes：
The optical modulation amplitude of the receiving terminal of the optical module to be measured is measured using optical Oscilloscope, described the is used as Two optical modulation amplitudes.
3. method of testing as claimed in claim 2, it is characterised in that：
The predetermined power interval is the power measurement scope of the optical Oscilloscope；
Or, the predetermined power interval is located in the range of the power measurement of the optical Oscilloscope.
4. method of testing as claimed in claim 1, it is characterised in that the measurement optical module to be measured Receiving sensitivity include：
The input optical power for being input to the optical module receiving terminal to be measured is adjusted in the way of from big to small, When the BER of the optical module to be measured reaches the first predetermined threshold, measured using light power meter The input optical power of the receiving terminal of the optical module to be measured, the reception for obtaining the optical module to be measured is sensitive Degree.
5. such as method of testing according to any one of claims 1 to 4, it is characterised in that the adjustment Being input to the input optical power of the optical module receiving terminal to be measured includes：
What regulation was arranged between reference transmitter transmitting terminal and the optical module receiving terminal to be measured adjustable declines Subtract device, to improve or reduce the input optical power for being input to the optical module receiving terminal to be measured.
6. such as method of testing according to any one of claims 1 to 4, it is characterised in that described by institute State the second optical modulation amplitude divided by the second power, be multiplied by the first power obtain in receiving sensitivity measurement the One optical modulation amplitude includes：
First power, the second power, the second optical modulation amplitude are converted into corresponding dBm；
After conversion, by second optical modulation amplitude subtract difference power obtain in receiving sensitivity measurement the One optical modulation amplitude；The difference power is that second power subtracts first power.
7. a kind of test system of optical modulation amplitude value in receiving sensitivity measurement, it is characterised in that bag Include：Reference transmitter, be arranged on it is adjustable between reference transmitter transmitting terminal and optical module receiving terminal to be measured Attenuator, light power meter, optical Oscilloscope, control device；
The control device is used to adjust the adjustable attenuator to measure the reception of the optical module to be measured Sensitivity, the receiving sensitivity that the light power meter is measured is recorded as the first power；It is described for adjusting Adjustable attenuator, makes to be input to the input optical power of the optical module receiving terminal to be measured to predetermined power area After interior, the input optical power that the light power meter is measured is recorded as the second power, and shows from the light Ripple device obtains the second optical modulation amplitude；By second optical modulation amplitude divided by the second power, first is multiplied by Power obtains the first optical modulation amplitude in receiving sensitivity measurement.
8. test system as claimed in claim 7, it is characterised in that：
The predetermined power interval is the power measurement scope of the optical Oscilloscope；
Or, the predetermined power interval is located in the range of the power measurement of the optical Oscilloscope.
9. test system as claimed in claim 7, it is characterised in that also include：
Error analyzer, the BER for measuring the optical module to be measured；
The control device is sensitive for adjusting reception of the adjustable attenuator to measure optical module to be measured Degree includes：
The control device adjusts the adjustable attenuator, makes to be input to the optical module receiving terminal to be measured Input optical power changes in the way of from big to small, the bit measured until the error analyzer When error rate reaches the first predetermined threshold, the optical module to be measured that the light power meter is measured is recorded The input optical power of receiving terminal, obtains the receiving sensitivity of the optical module to be measured.
10. the test system as any one of claim 7~9, it is characterised in that the control Second optical modulation amplitude divided by the second power are multiplied by the first power and obtain receiving sensitivity survey by equipment The first optical modulation amplitude in amount includes：
The control device is converted to first power, the second power, the second optical modulation amplitude accordingly DBm；After conversion, second optical modulation amplitude is subtracted into difference power and obtains receiving sensitivity survey The first optical modulation amplitude in amount；The difference power is that second power subtracts first power.
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