CN106992811B - Method and system for testing optical modulation amplitude value in receiving sensitivity measurement - Google Patents

Method and system for testing optical modulation amplitude value in receiving sensitivity measurement Download PDF

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CN106992811B
CN106992811B CN201610038586.XA CN201610038586A CN106992811B CN 106992811 B CN106992811 B CN 106992811B CN 201610038586 A CN201610038586 A CN 201610038586A CN 106992811 B CN106992811 B CN 106992811B
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modulation amplitude
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CN106992811A (en
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沈百林
武成宾
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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

Abstract

A test method and system of optical modulation amplitude value in receiving sensitivity measurement; the test method comprises the following steps: measuring the receiving sensitivity of an optical module to be tested, and recording the receiving sensitivity as a first power; after the input optical power input to the receiving end of the optical module to be tested is adjusted to be within a preset power interval, recording the input optical power as a second power, and measuring a second optical modulation amplitude; and dividing the second light modulation amplitude by the second power, and multiplying the second light modulation amplitude by the first power to obtain a first light modulation amplitude in the receiving sensitivity measurement. The present invention provides an improved test scheme for optically modulating amplitude values in receive sensitivity measurements.

Description

Method and system for testing optical modulation amplitude value in receiving sensitivity measurement
Technical Field
The invention relates to the field of optical communication, in particular to a method and a system for testing an optical modulation amplitude value in receiving sensitivity measurement.
Background
When evaluating the signal transmission capability of the ethernet optical interface, it is often necessary to consider the test of the receive sensitivity parameter, especially the evaluation based on the optical modulation amplitude. For non-return-to-zero signals, the optical modulation amplitude is defined as the power difference between the high level signal and the low level signal. However, when an oscilloscope is used to measure an input Optical signal, the measurement accuracy is often affected by the magnitude of the input Optical power, the smaller the input Optical power is, the larger the measurement error is, and the Optical modulation amplitude of the input Optical signal cannot be directly obtained when the receiving sensitivity is measured, in the conventional method, the extinction ratio is measured, and then a formula is used to calculate a corresponding OMA (Optical modulation amplitude), specifically as follows:
Figure BDA0000910895320000011
wherein SENOMAThe linear value of the optical modulation amplitude in the receiving sensitivity measurement, SEN is the linear value of the receiving sensitivity, and ER is the decibel value of the extinction ratio.
The above method, although solving the test of the receive-sensitivity optical modulation amplitude value of the non-return-to-zero signal, is somewhat complex to calculate and involves measurement of the intermediate parameter extinction ratio, and the calculation formula needs to be redesigned if higher order modulation, such as four-level pulse amplitude modulation, is involved. There is therefore a need to study and improve existing testing methods.
Disclosure of Invention
The present invention provides an improved test scheme for optically modulating amplitude values in receive sensitivity measurements.
In order to solve the above problems, the present invention adopts the following technical solutions.
A method for testing optical modulation amplitude values in receive sensitivity measurement, comprising:
measuring the receiving sensitivity of an optical module to be tested, and recording the receiving sensitivity as a first power;
after the input optical power input to the receiving end of the optical module to be tested is adjusted to be within a preset power interval, recording the input optical power as a second power, and measuring a second optical modulation amplitude;
and dividing the second light modulation amplitude by the second power, and multiplying the second light modulation amplitude by the first power to obtain a first light modulation amplitude in the receiving sensitivity measurement.
Optionally, the measuring the second light modulation amplitude comprises:
and measuring the light modulation amplitude of the receiving end of the optical module to be measured by using an optical oscilloscope as the second light modulation amplitude.
Optionally, the predetermined power interval is a power measurement range of the optical indicator;
or, the predetermined power interval is located in a power measurement range of the optical oscilloscope.
Optionally, the measuring the receiving sensitivity of the optical module to be measured includes:
and adjusting input optical power input to the receiving end of the optical module to be tested from large to small until the bit error rate of the optical module to be tested reaches a first preset threshold, and measuring the input optical power of the receiving end of the optical module to be tested by using an optical power meter to obtain the receiving sensitivity of the optical module to be tested.
Optionally, the adjusting input optical power input to the receiving end of the optical module to be tested includes:
and adjusting an adjustable attenuator arranged between a reference transmitter sending end and the receiving end of the optical module to be tested so as to improve or reduce the input optical power input to the receiving end of the optical module to be tested.
Optionally, the dividing the second light modulation amplitude by the second power and multiplying the second power by the first power to obtain the first light modulation amplitude in the receive sensitivity measurement includes:
converting the first power, the second power and the second light modulation amplitude into corresponding decibel milliwatts;
after conversion, subtracting a power difference from the second light modulation amplitude to obtain a first light modulation amplitude in receiving sensitivity measurement; the power difference is the second power minus the first power.
A system for testing optically modulated amplitude values in receive sensitivity measurements, comprising: the device comprises a reference transmitter, an adjustable attenuator arranged between a transmitting end of the reference transmitter and a receiving end of an optical module to be tested, an optical power meter, an optical oscillograph and control equipment;
the control equipment is used for adjusting the adjustable attenuator to measure the receiving sensitivity of the optical module to be measured, and recording the receiving sensitivity measured by the optical power meter as a first power; the adjustable attenuator is used for adjusting the adjustable attenuator, recording the input optical power measured by the optical power meter as a second power after the input optical power input to the receiving end of the optical module to be measured is within a preset power interval, and obtaining a second light modulation amplitude from the optical oscilloscope; and dividing the second light modulation amplitude by the second power, and multiplying the second light modulation amplitude by the first power to obtain a first light modulation amplitude in the receiving sensitivity measurement.
Optionally, the predetermined power interval is a power measurement range of the optical indicator;
or, the predetermined power interval is located in a power measurement range of the optical oscilloscope.
Optionally, the test system further includes:
the error code analyzer is used for measuring the bit error rate of the optical module to be measured;
the control device for adjusting the adjustable attenuator to measure the receiving sensitivity of the optical module to be measured comprises:
the control equipment adjusts the adjustable attenuator to enable the input optical power input to the receiving end of the optical module to be tested to change from large to small, and records the input optical power of the receiving end of the optical module to be tested measured by the optical power meter until the bit error rate measured by the error code analyzer reaches a first preset threshold value, so that the receiving sensitivity of the optical module to be tested is obtained.
Optionally, the control device dividing the second light modulation amplitude by the second power, and multiplying the second power by the first power to obtain the first light modulation amplitude in the receive sensitivity measurement includes:
the control equipment converts the first power, the second power and the second light modulation amplitude into corresponding decibel milliwatts; after conversion, subtracting a power difference from the second light modulation amplitude to obtain a first light modulation amplitude in receiving sensitivity measurement; the power difference is the second power minus the first power.
Compared with the prior art, the optical modulation amplitude test scheme provided by the embodiment of the invention can realize the test of the optical modulation amplitude value under lower optical power, has simple test steps, does not relate to complex calculation, is suitable for the test of a non-return-to-zero signal, can also be suitable for the test of a four-level pulse amplitude modulation signal, and can ensure the test precision.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic flowchart of a method for testing an amplitude value of optical modulation in reception sensitivity measurement according to a first embodiment;
FIG. 2 is a block diagram of a hardware system in an example of the first embodiment;
FIG. 3 is a flowchart illustrating an example of the first embodiment;
fig. 4 is a block diagram of a system for testing values of optical modulation amplitude in the reception sensitivity measurement according to the second embodiment.
Detailed Description
The technical solution of the present invention will be described in more detail with reference to the accompanying drawings and examples.
It should be noted that, if not conflicting, the embodiments of the present invention and the features of the embodiments may be combined with each other within the scope of protection of the present invention. Additionally, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
An embodiment of a method for testing an amplitude value of optical modulation in a receive sensitivity measurement, as shown in fig. 1, includes steps S110 to S130:
s110, measuring the receiving sensitivity of an optical module to be tested, and recording the receiving sensitivity as a first power;
s120, after the input optical power input to the receiving end of the optical module to be measured is adjusted to be within a preset power interval, recording the input optical power as a second power, and measuring a second light modulation amplitude;
and S130, dividing the second light modulation amplitude by the second power, and multiplying the second power by the first power to obtain a first light modulation amplitude in the receiving sensitivity measurement.
In this embodiment, the order of S120 and S110 may not be limited. Since the receiving sensitivity needs to be measured in S110 and the optical modulation amplitude needs to be measured in S120, the input optical power in S110 is necessarily smaller than the input optical power in S120; during the test, S110 may be performed first (if the input optical power is not appropriate, the input optical power is adjusted to be appropriate), and then the input optical power is adjusted to be large to perform S120, or S120 may be performed first (if the input optical power is not appropriate, the input optical power is adjusted to be appropriate), and then the input optical power is adjusted to be small to perform S110.
In the present embodiment, for S110, the appropriate input optical power is the input optical power small enough to be suitable for measuring the reception sensitivity; for S120, a suitable input optical power is an input optical power that is small enough to measure the optical modulation amplitude.
Optionally, the measuring the second light modulation amplitude comprises:
and measuring the light modulation amplitude of the receiving end of the optical module to be measured by using an optical oscilloscope as the second light modulation amplitude.
In other alternatives, other methods of measuring the magnitude of the light modulation may be used.
In this alternative, the predetermined power interval is a power measurement range of the optical oscilloscope;
or, the predetermined power interval is located in a power measurement range of the optical oscilloscope.
For example, the power measurement range of the optical oscilloscope is Px to Py, including Px and Py, where Py is greater than Px; the predetermined power interval may be directly set as the power measurement range, that is: px to Py, including Px and Py; the predetermined power interval may also fall within the power measurement range, i.e. the upper limit of the predetermined power interval is less than or equal to Py and the lower limit is greater than or equal to Px.
In other alternatives, the predetermined power interval may be set according to actual conditions.
Optionally, the measuring the receiving sensitivity of the optical module to be measured includes:
and adjusting input optical power input to the receiving end of the optical module to be tested from large to small until the bit error rate of the optical module to be tested reaches a first preset threshold, and measuring the input optical power of the receiving end of the optical module to be tested by using an optical power meter to obtain the receiving sensitivity of the optical module to be tested.
In other alternatives, other means of measuring the receive sensitivity may be used.
Optionally, the adjusting input optical power input to the receiving end of the optical module to be tested includes:
and adjusting an adjustable attenuator arranged between a reference transmitter sending end and the receiving end of the optical module to be tested so as to improve or reduce the input optical power input to the receiving end of the optical module to be tested.
In other alternatives, the input optical power input to the receiving end of the optical module to be tested may be adjusted in other manners.
Optionally, the dividing the second light modulation amplitude by the second power and multiplying the second power by the first power to obtain the first light modulation amplitude in the receive sensitivity measurement includes:
converting the first power, the second power and the second light modulation amplitude into corresponding decibel milliwatts;
after conversion, subtracting a power difference from the second light modulation amplitude to obtain a first light modulation amplitude in receiving sensitivity measurement; the power difference is the second power minus the first power.
In the alternative, the multiplication and division operation is converted into the addition and subtraction operation, so that the calculation complexity is further reduced.
In an example of this embodiment, a hardware system test block diagram corresponding to the test method is shown in fig. 2, and includes: the device comprises an error code analyzer, a reference transmitter, an optical module receiving part Rx to be tested, an adjustable attenuator, an optical oscillograph and an optical power meter. The error code analyzer outputs signals to a reference transmitter, then the output signals of the reference transmitter are input to a receiving part of the optical module to be tested after passing through an adjustable attenuator, and finally the output signals enter the receiving part of the error code analyzer. And the output end of the optical adjustable attenuator is provided with an optical power meter and an optical oscillograph for monitoring.
In this example, the flow of the test method described with reference to fig. 3 is as follows, and includes steps 101 to 103:
step 101: measuring reception sensitivity PL；
Step 101 may include:
adjusting the adjustable attenuator to gradually reduce the input optical power to the receiving end of the optical module to be tested from high to low until the bit error rate monitored by the error code meter is gradually increased and reaches a specified value, and measuring the input optical power of the optical module to be tested by using an optical power meter, namely, the input optical power is the pressure connection of the optical module to be testedSensitivity of reception PL；PLThe first power;
the reception sensitivity measurement method can be referred to in the related art.
Step 102: increasing input optical power to a suitable range of optical oscilloscope specifications, measuring input optical power PHAnd corresponding optical modulation amplitude OMAH；
Step 102 may include:
adjusting the adjustable attenuator to make the input light power of the optical oscilloscope proper, and recording the input light power PH，PHThe second power; testing second optical modulation amplitude OMA with an optical oscilloscopeHIf errors exist in the power measurement of the optical oscillograph, the power measurement can be eliminated by comparing and calibrating the optical power meter;
the optical oscilloscope usually has strict requirements on input optical power during testing, and the optical oscilloscope can accurately measure the optical modulation amplitude only when the input optical power is within a measurement range, so that the optical modulation amplitude cannot be measured by the optical oscilloscope at the same time when the input optical power is low, such as when the receiving sensitivity is measured.
Step 103: calculating the light modulation amplitude in the receiving sensitivity measurement:
OMAL＝OMAH-(PH-PL)。
in the above steps, the parameter units are all decibel-milliwatt dBm.
The test method of the embodiment is similarly applicable to the test of the optical modulation amplitude of the pressurized receiving sensitivity, the error code analyzer needs to have a signal pressurization function, and the optical oscillograph can monitor the quality of the pressurized signal before the pressurized receiving sensitivity is tested.
The basic principle of the method for testing the amplitude of the optical modulation in the measurement of the receiving sensitivity is described in this embodiment, and a non-return-to-zero code signal is taken as an example for explanation.
Setting the power of the second signal and the first signal to P1 and P0 respectively when measuring the receiving sensitivity, the average power PLThe linearity value was 0.5 × (P1+ P0).
The extinction ratio is set to ER, and ER is P1/P0. Attention is paid to that the adjustment of the adjustable attenuator does not influence the change of the optical power of the signalThe extinction ratio. Then PL0.5 × (P1+ P1/ER). Then P1 is k0 XPLWhere k0 is a constant.
After the input optical power is increased, the powers of the second signal and the first signal are respectively set to be P11 and P00 when the input optical power is the second power (namely, the input optical power of the optical indicator is in a predetermined power range), and then the average power P is setHThe linearity value is 0.5 × (P11+ P00), which is likewise P11 ═ k0 × PH。
And respectively calculating the light modulation amplitudes corresponding to the two powers:
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；
OMA is readily derived from the above two formulasL＝OMAH/PH×PL。
There is OMA if the above parameters are converted to decibel-milliwatts as unitsL＝OMAH-(PH-PL)。
The derivation of the above test principle is based on the nrzi signal, and is similarly applicable to the test of the four-level pwm signal, which is as follows:
when measuring the receiving sensitivity: pL＝0.25×(P0+P1+P2+P3)。
P0, P1, P2, P3 are a first signal level, a second signal level, a third signal level, and a fourth signal level, respectively, at the time of measuring the reception sensitivity.
When the input optical power is appropriate: pH＝0.25×(P00+P11+P22+P33)。
P00, P11, P22, P33 are the first signal level, the second signal level, the third signal level, and the fourth signal level, respectively, when the input optical power is appropriate.
Assuming that the minimum value of OMA of the four-level pulse amplitude modulation signal is the difference between the third signal level P22 and the second signal level P11, i.e. there is OMAH＝P22-P11。
It is easy to obtain: OMAH＝P22-P11＝k0×(P22+P11)＝k×PH. In the same way there is OMAL＝k×PL。
OMA thereforeL＝OMAH/PH×PL. Conversion to decibel milliwatts, OMAL＝OMAH-(PH-PL)。
An embodiment two, a system for testing an amplitude value of optical modulation in a receive sensitivity measurement, as shown in fig. 3, includes: the device comprises a reference transmitter 31, an adjustable attenuator 32 arranged between a sending end of the reference transmitter and a receiving end of an optical module 30 to be tested, an optical power meter 33, an optical oscilloscope 34 and a control device 35;
the control device 35 is configured to adjust the adjustable attenuator 32 to measure the receiving sensitivity of the optical module 30 to be measured, and record the receiving sensitivity measured by the optical power meter 33 as a first power; the adjustable attenuator 32 is configured to adjust the input optical power input to the receiving end of the optical module to be measured 30 to a predetermined power interval, record the input optical power measured by the optical power meter 33 as a second power, and obtain a second optical modulation amplitude from the optical indicator 34; and dividing the second light modulation amplitude by the second power, and multiplying the second light modulation amplitude by the first power to obtain a first light modulation amplitude in the receiving sensitivity measurement.
In other embodiments, all or part of the operations of the control device 35 may also be performed by a human.
Optionally, the predetermined power interval is a power measurement range of the optical indicator;
or, the predetermined power interval is located in a power measurement range of the optical oscilloscope.
Optionally, the test system further includes:
the error code analyzer is used for measuring the bit error rate of the optical module to be measured;
the control device for adjusting the adjustable attenuator to measure the receiving sensitivity of the optical module to be measured comprises:
the control equipment adjusts the adjustable attenuator to enable the input optical power input to the receiving end of the optical module to be tested to change from large to small, and records the input optical power of the receiving end of the optical module to be tested measured by the optical power meter until the bit error rate measured by the error code analyzer reaches a first preset threshold value, so that the receiving sensitivity of the optical module to be tested is obtained.
Optionally, the control device dividing the second light modulation amplitude by the second power, and multiplying the second power by the first power to obtain the first light modulation amplitude in the receive sensitivity measurement includes:
the control equipment converts the first power, the second power and the second light modulation amplitude into corresponding decibel milliwatts; after conversion, subtracting a power difference from the second light modulation amplitude to obtain a first light modulation amplitude in receiving sensitivity measurement; the power difference is the second power minus the first power.
Other implementation details can be found in example one.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A method for testing optical modulation amplitude values in receive sensitivity measurement, comprising:
measuring the receiving sensitivity of an optical module to be measured, wherein the receiving sensitivity is first power;
after adjusting the input optical power input to the receiving end of the optical module to be tested to a preset power interval, recording the input optical power as a second power, and measuring a second optical modulation amplitude, wherein the first power is smaller than the second power;
dividing the second light modulation amplitude by second power, and multiplying the second light modulation amplitude by first power to obtain a first light modulation amplitude in receiving sensitivity measurement;
wherein, measuring the receiving sensitivity of the optical module to be measured comprises: and adjusting input optical power input to the receiving end of the optical module to be tested from large to small until the bit error rate of the optical module to be tested reaches a first preset threshold, and measuring the input optical power of the receiving end of the optical module to be tested by using an optical power meter to obtain the receiving sensitivity of the optical module to be tested.
2. The test method of claim 1, wherein measuring the second amplitude of light modulation comprises:
and measuring the light modulation amplitude of the receiving end of the optical module to be measured by using an optical oscilloscope as the second light modulation amplitude.
3. The test method of claim 2, wherein:
the preset power interval is the power measurement range of the optical oscillograph;
or, the predetermined power interval is located in a power measurement range of the optical oscilloscope.
4. The test method according to any one of claims 1 to 3, wherein the adjusting input optical power input to a receiving end of the optical module to be tested comprises:
and adjusting an adjustable attenuator arranged between a reference transmitter sending end and the receiving end of the optical module to be tested so as to improve or reduce the input optical power input to the receiving end of the optical module to be tested.
5. The test method of any of claims 1-3, wherein the dividing the second modulated light amplitude by a second power and multiplying by a first power to obtain a first modulated light amplitude in the receive sensitivity measurement comprises:
converting the first power, the second power and the second light modulation amplitude into corresponding decibel milliwatts;
after conversion, subtracting a power difference from the second light modulation amplitude to obtain a first light modulation amplitude in receiving sensitivity measurement; the power difference is the second power minus the first power.
6. A system for testing optically modulated amplitude values in receive sensitivity measurements, comprising: the device comprises a reference transmitter, an adjustable attenuator arranged between a transmitting end of the reference transmitter and a receiving end of an optical module to be tested, an optical power meter, an optical oscillograph and control equipment;
the control equipment is used for adjusting the adjustable attenuator to measure the receiving sensitivity of the optical module to be measured, and recording the receiving sensitivity measured by the optical power meter as a first power; the adjustable attenuator is used for adjusting the adjustable attenuator, recording the input optical power measured by the optical power meter as a second power after the input optical power input to the receiving end of the optical module to be measured is within a preset power interval, and obtaining a second light modulation amplitude from the optical oscilloscope; dividing the second light modulation amplitude by a second power, and multiplying the second light modulation amplitude by a first power to obtain a first light modulation amplitude in receiving sensitivity measurement, wherein the first power is smaller than the second power;
wherein, the system still includes: the error code analyzer is used for measuring the bit error rate of the optical module to be measured;
the control device for adjusting the adjustable attenuator to measure the receiving sensitivity of the optical module to be measured comprises:
the control equipment adjusts the adjustable attenuator to enable the input optical power input to the receiving end of the optical module to be tested to change from large to small, and records the input optical power of the receiving end of the optical module to be tested measured by the optical power meter until the bit error rate measured by the error code analyzer reaches a first preset threshold value, so that the receiving sensitivity of the optical module to be tested is obtained.
7. The test system of claim 6, wherein:
the preset power interval is the power measurement range of the optical oscillograph;
or, the predetermined power interval is located in a power measurement range of the optical oscilloscope.
8. The test system of any of claims 6 to 7, wherein the control device dividing the second modulated light amplitude by a second power, multiplying by the first power to obtain a first modulated light amplitude in the receive sensitivity measurement comprises:
the control equipment converts the first power, the second power and the second light modulation amplitude into corresponding decibel milliwatts; after conversion, subtracting a power difference from the second light modulation amplitude to obtain a first light modulation amplitude in receiving sensitivity measurement; the power difference is the second power minus the first power.
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