CN113381807B

CN113381807B - Optical module performance detection device, method and system

Info

Publication number: CN113381807B
Application number: CN202110523133.7A
Authority: CN
Inventors: 刘思尧; 蒋旭
Original assignee: Accelink Technologies Co Ltd
Current assignee: Accelink Technologies Co Ltd
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2022-09-09
Anticipated expiration: 2041-05-13
Also published as: CN113381807A

Abstract

The embodiment of the invention discloses optical module performance detection equipment, method and system. The detection device comprises a photoelectric conversion component, a control component, an amplification component and an interface component, wherein the photoelectric conversion component is used for receiving an optical signal, converting the optical signal into a current signal and respectively sending the current signal to the control component and the amplification component; the optical signal is transmitted or received by an optical module to be tested; the control component is used for receiving the current signal and obtaining the power value of the optical signal based on the current signal and a specific function; the amplifying assembly is used for receiving the current signal, converting the current signal into a voltage signal, amplifying the voltage signal according to a set multiple, and outputting the amplified voltage signal through the interface assembly; the amplified voltage signal is used for comparing with a voltage signal related to the optical signal in the optical module to be tested to obtain a performance index of the optical module to be tested under the power value.

Description

Optical module performance detection device, method and system

Technical Field

The invention relates to the technical field of optical communication, in particular to optical module performance detection equipment, method and system.

Background

In the field of Optical communications, an Optical Module (OM) is a core component, which is a small-sized package Module that can be hot-plugged and unplugged. In the development and production process of the optical module, a lot of tests on the optical signal emitted from the emitting end of the optical module and the photoelectric conversion performance of the receiving end are involved, and usually some indexes such as optical power, jitter, data recovery time, and the like are tested to evaluate the performance of the optical module. If these indexes are not normal, that is, the performance of a certain function of the optical module is poor, problems such as packet leakage and network connection failure often occur when the optical module is used for optical communication. In some scenarios, the requirements on some indexes of the Optical module and the test accuracy of some indexes are particularly high, for example, as a Passive Optical Network (PON) is upgraded to a 10G rate, new and old devices are compatible, and a GPON/XGPON hybrid distribution Network has higher and higher requirements on the transmission Optical power of the Optical module to improve a power budget margin; for another example, PON networks use time division multiplexing and often require timing on the order of 10 ns. In the traditional optical module testing scheme, tests of all performance indexes are covered by various testing devices, the testing devices are too large in size and weight, great troubles are caused to research and development and production of the optical module, and due to the fact that the existing optical module testing environment is more and more complex, the time for setting up the testing environment is more and more long, and the testing cost is more and more high. Therefore, there is a need for a device capable of coping with various performance tests to solve the practical dilemma.

Disclosure of Invention

In view of the above, the present invention is directed to an optical module performance detection apparatus, method and system, where the apparatus has low cost and portability, is compatible with various performance tests of an optical module, and has accurate and efficient test.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides an optical module performance detection apparatus, where the detection apparatus includes: a photoelectric conversion component, a control component, an amplification component and an interface component, wherein,

the photoelectric conversion component is used for receiving an optical signal, converting the optical signal into a current signal, and respectively sending the current signal to the control component and the amplification component; the optical signal is transmitted or received by an optical module to be tested;

the control component is used for receiving the current signal and obtaining the power value of the optical signal based on the current signal and a specific function;

the amplifying assembly is used for receiving the current signal, converting the current signal into a voltage signal, amplifying the voltage signal according to a set multiple, and outputting the amplified voltage signal through the interface assembly; the amplified voltage signal is used for comparing with a voltage signal related to the optical signal in the optical module to be tested to obtain a performance index of the optical module to be tested under the power value; the performance index is used for evaluating the specific performance of the optical module to be tested; the specific property is determined by the correlated voltage signal.

In the above solution, the detection apparatus further includes a power control component, which is respectively connected to the control component and the photoelectric conversion component, and is configured to control a bias voltage applied to the photoelectric conversion component based on a first control signal sent by the control component;

the detection device further comprises a display component, connected to the control component, and configured to receive the power value sent by the control component and display the power value.

In the above scheme, the control component is connected to an upper computer, and is configured to report test data to the upper computer and/or receive a control instruction issued by the upper computer, and generate at least one of the following signals based on the control instruction: the first control signal, the second control signal, and the third control signal; the test data at least comprises a power value of the optical signal and the performance index; the second control signal is used for adjusting the amplification factor of the amplification component; the third control signal is used to adjust a reference level of the amplifying component.

In the above scheme, the photoelectric conversion component is a PIN photodiode or an avalanche photodiode APD;

the interface assembly comprises a first interface and a second interface, wherein the first interface is a Universal Serial Bus (USB) interface or an internal integrated circuit (I2C) interface and is used for connecting the control assembly with the upper computer; the second interface is an SMA interface and is used for outputting the amplified voltage signal converted by the amplifying assembly; the SMA interface is a subminiature version A interface.

In the above aspect, the control assembly includes: a processor and a memory for storing a computer program operable on the processor, wherein the processor is operable to perform at least one of the following steps when executing the computer program:

receiving the current signal, and obtaining a power value of the optical signal based on the current signal and a specific function;

sending a first control signal to the power control component;

sending the power value to the display component;

the method comprises the following steps of reporting test data to the upper computer and/or receiving a control instruction issued by the upper computer, and generating at least one of the following signals based on the control instruction: the first control signal, the second control signal, and the third control signal.

In a second aspect, an embodiment of the present invention further provides a method for detecting performance of an optical module, where the method includes:

receiving an optical signal and converting the optical signal into a current signal; the optical signal is transmitted or received by an optical module to be tested;

obtaining a power value of the optical signal based on the current signal and a specific function;

converting the current signal into a voltage signal, amplifying the voltage signal according to a set multiple, and comparing the amplified voltage signal with a voltage signal related to the optical signal in the optical module to be tested to obtain a performance index of the optical module to be tested under the power value;

evaluating the specific performance of the optical module to be tested based on the performance index; the specific property is determined by the correlated voltage signal.

In the above solution, the obtaining the power value of the optical signal based on the current signal and a specific function includes:

performing analog-to-digital conversion on the current signal according to a set frequency to obtain a digital signal corresponding to the current signal; substituting the digital signal into the specific function to convert the power value of the optical signal; wherein the specific function is used for reflecting the corresponding relation between the digital signal and the power of the optical signal.

In the above scheme, the correlated voltage signal includes at least one of: a supply voltage signal, a switch voltage signal, an output voltage signal, an SD/LOS voltage signal, a received signal strength indicating an input voltage signal of an RSSI sampling circuit.

In a third aspect, an embodiment of the present invention further provides a system for detecting performance of a receiving end of an optical module, where the system includes: the detection device comprises a first upper computer, a controllable light source, a light splitter, a first oscilloscope and a first module to be detected, wherein,

the controllable light source provides first optical signals with the same power for the detection equipment and the first module to be detected through the optical splitter;

the detection equipment is connected with the first oscilloscope and used for receiving a first optical signal, converting the first optical signal into a first current signal and obtaining the power value of the first optical signal based on the first current signal and a specific function; converting the first current signal into a first voltage signal, amplifying the first voltage signal according to a set multiple, and outputting the amplified first voltage signal to the first oscilloscope;

the first oscilloscope is respectively connected with the detection device and the first module to be measured, and is configured to receive the amplified first voltage signal and a voltage signal in the first module to be measured, which is related to the first optical signal, compare the amplified first voltage signal with the voltage signal related to the first optical signal, and obtain a first performance index of the first module to be measured at the power value;

the detection device is connected with the first upper computer, and is configured to report first test data to the first upper computer and/or receive a first control instruction issued by the first upper computer, and generate at least one of the following signals based on the first control instruction: a first control signal, a second control signal, and a third control signal; the test data comprises at least a power value of the first optical signal and the first performance indicator; the first control signal is used for controlling a bias voltage applied to a photoelectric conversion component in the detection device, the second control signal is used for adjusting the amplification factor of an amplification component in the detection device, and the third control signal is used for adjusting the reference level of the amplification component;

wherein the first performance indicator is used to evaluate a first specific performance of the first to-be-measured optical module, the first specific performance being determined by the voltage signal related to the first optical signal.

In a fourth aspect, an embodiment of the present invention further provides a system for detecting performance of an optical module transmitting end, where the system includes: the detection device comprises any one of the detection devices, a second upper computer, an optical fiber, a second oscilloscope and a second optical module to be detected,

the detection equipment is connected with the second optical module to be detected through the optical fiber and is used for receiving a second optical signal emitted by the second optical module to be detected and converting the second optical signal into a second current signal; obtaining a power value of the second optical signal based on the second current signal and a specific function; converting the second current signal into a second voltage signal, amplifying the second voltage signal according to a set multiple, and outputting the amplified second voltage signal to the second oscilloscope;

the second oscilloscope is connected to the detection device and the second optical module to be detected respectively, and is configured to receive the amplified second voltage signal sent by the detection device and a voltage signal in the second optical module to be detected, which is related to the second optical signal, compare the amplified second voltage signal with the voltage signal related to the second optical signal, and obtain a second performance index of the second optical module to be detected under the power value;

the detection device is connected with the second upper computer, and is configured to report second test data to the second upper computer and/or receive a second control instruction issued by the second upper computer, and generate at least one of the following signals based on the second control instruction: a first control signal, a second control signal, and a third control signal; the second test data includes at least a power value of the second optical signal and the second performance indicator; the first control signal is used for controlling a bias voltage applied to a photoelectric conversion component in the detection device, the second control signal is used for adjusting the amplification factor of an amplification component in the detection device, and the third control signal is used for adjusting the reference level of the amplification component;

the second performance index is used for evaluating a second specific performance of the second optical module to be tested, and the second specific performance is determined by the voltage signal related to the second optical signal.

The embodiment of the invention provides optical module performance detection equipment, a method and a system, wherein the detection equipment comprises: the photoelectric conversion component is used for receiving an optical signal, converting the optical signal into a current signal, and respectively sending the current signal to the control component and the amplification component; the optical signal is transmitted or received by an optical module to be tested; the control component is used for receiving the current signal and obtaining the power value of the optical signal based on the current signal and a specific function; the amplifying assembly is used for receiving the current signal, converting the current signal into a voltage signal, amplifying the voltage signal according to a set multiple, and outputting the amplified voltage signal through the interface assembly; the amplified voltage signal is used for comparing with a voltage signal related to the optical signal in the optical module to be tested to obtain a performance index of the optical module to be tested under the power value; the performance index is used for evaluating the specific performance of the optical module to be tested; the specific property is determined by the correlated voltage signal. The detection equipment provided by the embodiment of the invention can provide more performance index tests for the optical module in a smaller size, realizes the function of one machine with multiple purposes, is convenient to carry, and can meet the requirements of the performance tests of the optical module under various emergency conditions; moreover, compared with the traditional optical module performance test mode, the detection equipment has lower cost.

Drawings

Fig. 1 is a schematic structural diagram of an optical module performance detection device according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a hardware structure of a control component in the detection apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an optical module receiving end performance detection system formed by using detection equipment provided in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an optical module transmitting end performance detection system including detection equipment according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating an optical module performance detection method according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes specific technical solutions of the present invention in further detail with reference to the accompanying drawings in the embodiments of the present invention. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1, a schematic structural diagram of an optical module performance detection apparatus provided in an embodiment of the present invention is shown. In fig. 1, the detection apparatus 10 includes: a photoelectric conversion component 101, a control component 102, an amplification component 103, and an interface component 104, wherein,

the photoelectric conversion module 101 is configured to receive an optical signal, convert the optical signal into a current signal, and send the current signal to the control module 102 and the amplification module 103, respectively; the optical signal is transmitted or received by an optical module to be tested;

the control component 102 is configured to receive the current signal, and obtain a power value of the optical signal based on the current signal and a specific function;

the amplifying component 103 is configured to receive the current signal, convert the current signal into a voltage signal, amplify the voltage signal according to a set multiple, and output the amplified voltage signal through the interface component 104; the amplified voltage signal is used for comparing with a voltage signal related to the optical signal in the optical module to be tested to obtain a performance index of the optical module to be tested under the power value; the performance index is used for evaluating the specific performance of the optical module to be tested; the specific property is determined by the correlated voltage signal.

In some embodiments, the photoelectric conversion component is a PIN photodiode or avalanche photodiode, APD; the PIN type and the APD are compatible, in other words, any one of the two types of photodiodes can be arranged in the detection device provided by the embodiment of the present invention, and when the photodiode needs to be replaced, the photodiode can be simply replaced without a great deal of modification to the detection device. The gain of the PIN and the APD can be changed by adjusting the bias voltage of the photodiode through the control component so as to adapt to different test conditions.

The interface component can comprise a first interface and a second interface, wherein the first interface is a Universal Serial Bus (USB) interface or an internal integrated circuit (I2C) interface and is used for connecting the control component with an upper computer; the second interface is an ultra-small version a (SMA) interface, and is configured to output the voltage signal converted by the amplifying component.

The amplifying component can be a high-speed amplifying circuit, can convert the current signal into a voltage signal and amplify the voltage signal, can adjust the amplification factor under the control of the control component, and can switch between two bandwidth modes of 2.5G/10G and two working modes of level following/trans-impedance amplification.

The control component may be an integrated circuit chip with signal processing functionality. As an implementation manner, in some embodiments, as shown in fig. 2, it shows a schematic diagram of a hardware structure of a control component in a detection device provided in an embodiment of the present invention, and as shown in fig. 2, the control component may include: a processor 1021 and a memory 1022 for storing a computer program operable on the processor, wherein the processor is operable to perform at least one of the following steps when executing the computer program:

sending a first control signal to the power control component;

sending the power value to the display component;

It should be noted that specific meanings of the first control signal and the second control signal are described in the following, and are not described herein again.

In practical applications, the control component may further include at least one communication interface 1023, and the various components in the control component 102 are coupled together by a bus system 1024, it being understood that the bus system 1024 is used to implement connection communication between these components. The bus system 1024 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are designated as the bus system 1024 in figure 2.

It will be appreciated that the memory 1022 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. Among them, the nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Erasable Programmable Read-Only Memory (EEPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic Random access Memory (FRAM), a ferroMagNetic Random access Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), Synchronous Dynamic Random Access Memory (SLDRAM), Direct Memory (DRmb Access), and Random Access Memory (DRAM). The memory 1022 described in connection with the embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.

The memory 1022 in embodiments of the present invention is used to store various types of data to support the operation of the control component 102. Examples of such data include: any computer program for operating on the control component 102, such as implementation of obtaining the power value of the optical signal based on the current signal and a specific function, etc., a program implementing the method of an embodiment of the present invention may be contained in the memory 1022.

In some embodiments, the control component is connected to an upper computer, and is configured to report test data to the upper computer and/or receive a control instruction issued by the upper computer, and generate at least one of the following signals based on the control instruction: the first control signal, the second control signal, and the third control signal; the test data at least comprises a power value of the optical signal and the performance index; the second control signal is used for adjusting the amplification factor of the amplification component; the third control signal is used to adjust a reference level of the amplifying component.

It should be noted that what is described here may be: the upper computer and the control assembly in the detection equipment can communicate with each other, and parameters required by normal work of each component in the detection equipment can be configured by the upper computer through the control assembly. The test data obtained by the detection equipment can also be reported to the upper computer through the control assembly, and the test data is displayed or stored by the upper computer for subsequent use by a tester. The connection between the control component and the upper computer can be through the communication interface, which can be the aforementioned USB interface or I2C interface. Said second control signal is used to adjust the amplification factor of said amplification module, i.e. the control module issues a second control signal to the amplification module, which adjusts its set amplification factor based on said second control signal.

Based on the structure of the detection device described in the foregoing, the working principle of the detection device is as follows: inputting an optical signal which is the same as that of the optical module to be detected, or inputting an optical signal emitted by the optical module to be detected into the detection equipment, then converting the optical signal by a photoelectric conversion assembly in the detection equipment to obtain a current signal, and respectively sending the current signal to a control assembly and an amplification assembly in the detection equipment; then the control component obtains the power value of the optical signal based on the current signal and a specific function; the amplifying assembly converts the current signal into a voltage signal, amplifies the voltage signal according to a set multiple, and outputs the amplified voltage signal through the interface assembly, wherein the amplified voltage signal is used for comparing with a voltage signal related to the optical signal in the optical module to be tested to obtain a performance index of the optical module to be tested under the power value. And then, the control component or the upper computer evaluates the specific performance of the optical module to be tested based on the performance index. The specific performance is determined by the related voltage signals, that is, different related voltage signals are used for testing different performances of the optical module to be tested.

Wherein the specific function is stored in the detection device and is used for reflecting the corresponding relation between the power of the digital signal and the power of the optical signal. In an actual application process, the acquisition of the specific function is to calibrate a sampling function of the control component in the detection device before the detection device is used to test the optical module to be tested, specifically, a plurality of groups of optical signals with fixed optical power are sequentially input, a current signal converted by the optical signal with fixed optical power through the photoelectric conversion component is sampled according to a set frequency through an Analog-to-Digital Converter (ADC) corresponding to the control component in the detection device, a Digital signal value corresponding to each optical signal with fixed optical power is obtained, and then a function is formed according to the data and stored in the control component, wherein the function is the specific function.

It should be understood by those skilled in the art that the current signal obtained by converting the optical signal by the optical-to-electrical conversion component is weak, and for the convenience of subsequent use, the current signal is converted into a voltage signal by the amplifying component, and the voltage signal is amplified to reach the transmission frequency of the interface component for subsequent transmission use.

In the practical application process, the related voltage signals can be divided into two types according to whether the optical signal is received by the optical module to be tested or transmitted by the optical module to be tested: one type is: the receiving end of the optical module to be tested generates a related voltage signal based on the optical signal; the other type is: and the transmitting end of the optical module to be tested transmits a related voltage signal required by the optical signal.

Specifically, the voltage signal generated by the receiving end based on the optical signal may be at least one of the following: an output voltage Signal of a receiving end of the optical module to be detected, an input voltage Signal of a Received Signal Strength Indication (RSSI) sampling circuit in the optical module to be detected, and a Signal detection/Signal LOSs SD/LOS voltage Signal; the associated voltage signal required by the transmitting end to transmit the optical signal may be at least one of: a power supply voltage signal of the optical module to be tested and a switch voltage signal of a transmitting end of the optical module to be tested;

in the related optical signals of the receiving end of the optical module to be detected, the output voltage signal of the receiving end of the optical module to be detected is a voltage signal which is output after a series of processing in the optical module to be detected after the receiving end of the optical module to be detected receives the same optical signal as that input into the detection device; an input voltage Signal of the Received Signal Strength Indication (RSSI) sampling circuit; the SD/LOS voltage signal may be a level signal output when the optical detection unit in the optical module under test detects that an optical signal is received, or a level signal output when the optical signal disappears.

In the related voltage signals of the transmitting end of the optical module to be tested, the power supply voltage signal is a voltage signal provided for the normal work of the optical module to be tested as the name implies; the bus bar mounted on a Printed Circuit Board (PCB) in the optical module may be connected to an external power supply through a wire, and the power supply voltage signal may be acquired. The switch voltage signal is a voltage signal applied to a transmitting switch at a transmitting end of the optical module to be detected, the switch voltage signal controls the on-off of the transmitting switch, and the on-off of the transmitting switch controls whether the optical module to be detected can transmit the optical signal.

Based on the related voltage signal, the comparing of the amplified voltage signal with the voltage signal related to the optical signal in the optical module to be tested to obtain the performance index of the optical module to be tested under the power value may specifically include:

specifically, as an optional implementation manner, both voltage signals can be output to an oscilloscope, and the photoelectric recovery time and the photoelectric recovery quality of the receiving end of the optical module to be tested are observed in the oscilloscope; the photoelectric recovery time is the difference between the time when the output voltage signal of the receiving end of the optical module to be detected is output to the oscilloscope and the time when the amplified voltage signal is output to the oscilloscope, the photoelectric recovery quality can compare the waveforms of the output voltage signal and the amplified voltage signal, if the similarity of the waveforms of the output voltage signal and the amplified voltage signal reaches a set percentage, the photoelectric recovery quality of the optical module to be detected is considered to be good, if the similarity of the waveforms of the output voltage signal and the amplified voltage signal does not reach the set percentage, the photoelectric recovery quality of the optical module to be detected is considered to be poor, and the set percentage can be set according to the actual optical signal recovery requirement. Correspondingly, the speed of the optical module to be tested for recovering the information in the optical signal can be determined according to the photoelectric recovery time; and determining the condition of the optical module to be tested for information recovery in the optical signal according to the photoelectric recovery quality. It should be noted that, because the detection device provided in the embodiment of the present application has fewer components and a simpler structure, the output time of the amplified voltage signal may be equivalent to the incident time of an optical signal, that is, may be equivalent to the time when a receiving end in the optical module to be tested receives the optical signal.

In the case that the relevant voltage signal is a signal detection/signal LOSs SD/LOS voltage signal, comparing the amplified voltage signal with the signal detection/signal LOSs SD/LOS voltage signal, so as to obtain SD/LOS response/de-response time, specifically, as an optional implementation manner, both the two voltage signals may be output to an oscilloscope, SD/LOS response/de-response time of a receiving end of the optical module to be tested is observed in the oscilloscope, and correspondingly, whether the SD/LOS response/de-response delay condition of the optical module to be tested meets the requirement or not may be determined according to the SD/LOS response/de-response time.

When the relevant voltage signal is the input voltage signal, comparing the amplified voltage signal with the input voltage signal to obtain the time required by the optical module to be tested to output a stable output voltage signal when the optical signal is a time-division burst optical signal; because the optical module to be tested has a circuit for monitoring the power of the optical signal received by the optical module to be tested, the method also comprises the following steps: the RSSI sampling circuit needs to sample the electric signal converted from the optical signal in the optical module to be tested, the circuit for converting the optical signal into the electrical signal in the optical module under test needs a stabilization time when facing the burst optical signal, otherwise the electrical signal which cannot be output cannot correctly reflect the intensity (i.e. power) of the optical signal, if such an electrical signal is used for sampling, the obtained RSSI value does not correctly reflect the intensity of the optical signal, the detection device provided in the embodiment of the present application may measure a time required for the optical module to be tested to output a stable output voltage signal when the optical signal is a time-division burst optical signal, which may also be referred to as a stabilization time, as an optional implementation manner, the input voltage signal and the amplified voltage signal can be displayed in an oscilloscope, so that a tester can observe the time; correspondingly, the response condition of the optical module to be tested facing the burst optical signal can be determined according to the stable time.

When the related voltage signal is a power supply voltage signal, comparing the power supply voltage signal with the amplified voltage signal to obtain an initialization time of the transmitting end of the optical module to be tested, where the initialization time is a difference between a time when the optical module to be tested starts to be powered on and a time when the optical module to be tested can stably transmit the optical signal. Correspondingly, the response speed of the optical module to be tested facing the sudden power-on can be determined according to the initialization time. It should be noted that, the stable emission optical signal mentioned herein may mean that the optical module to be tested can emit an optical signal fixed at a certain power.

When the related voltage signal is the switch voltage signal, the switch voltage signal is compared with the amplified voltage signal, so that the time from the time when a transmitting switch in the optical module to be detected is closed to the time when the optical module to be detected can stably transmit the light signal or the time from the time when the transmitting switch in the optical module to be detected is opened to the time when the optical module to be detected completely stops transmitting the light signal can be obtained. Correspondingly, the switching characteristic condition of the transmitting switch in the optical module to be tested can be determined according to the two times.

It should be noted that the embodiments of the present invention also follow a general testing principle, that is: in the previous tests, when any one of the optical modules to be tested is tested, parameters of other items in the optical module to be tested are kept constant. The aforementioned fast and slow recovery degree of information in the optical signal, the information recovery condition in the optical signal, the SD/LOS response/de-response delay condition, the response condition facing a burst optical signal, the fast and slow response condition facing a sudden power-up, and the switching characteristic condition of the launch switch in the optical module to be tested are one of the aforementioned specific performances.

In the practical application process, the detection device further comprises a power supply control component which is respectively connected with the control component and the photoelectric conversion component and is used for controlling the bias voltage applied to the photoelectric conversion component based on a first control signal sent by the control component;

Here, the power control component may be a power control circuit, and in practical implementation, it may be a power circuit with adjustable voltage. The power supply control component is controlled by the aforementioned control component, and can receive a first control signal sent by the control component, and control the bias voltage on the photoelectric conversion component based on the first control signal, that is: the power supply control component can provide bias voltage for the photoelectric conversion component, and can adjust the magnitude of the provided bias voltage under the control of the control component.

In some embodiments, the display component may be a display control circuit including a small lcd screen, and after receiving the power value sent by the control component, the display control circuit decodes the power value and controls the small lcd screen to display the power value, and the display precision may retain 2 bits after the decimal point.

As an alternative embodiment, based on the foregoing detection device, an embodiment of the present invention further provides a performance detection system for a receiving end of an optical module, as shown in fig. 3, which shows a schematic structural diagram of the performance detection system for the receiving end of an optical module, where the performance detection system is composed of the detection device provided in the embodiment of the present invention. In fig. 3, the receiving end performance detecting system 30 includes: the detection apparatus 10 of any one of the preceding claims, a first upper computer 301, a controllable light source 302, a beam splitter 303, a first oscilloscope 304, and a first module to be detected 305, wherein,

the first oscilloscope is connected to the detection device and the first module to be measured, and is configured to receive the amplified first voltage signal and a voltage signal in the first module to be measured, which is related to the first optical signal, compare the amplified first voltage signal and the voltage signal related to the first optical signal, and obtain a first performance index of the first module to be measured at the power value;

wherein the first performance indicator is used to evaluate a first specific performance of the first module to be measured, the first specific performance being determined by the voltage signal related to the first optical signal.

It should be noted that the detection system described herein may be a test system built for detecting the performance of the receiving end of the first module to be detected, and in the detection system, the detection apparatus may include a main control chip, a power supply control circuit, a photoelectric conversion circuit, a high-speed amplification circuit, a display control circuit, related control software, a USB interface, and an SMA interface, where the main control chip is a specific representation form of the control assembly, and the power supply control circuit is a specific representation form of the power supply control assembly; the photoelectric conversion circuit is a concrete form of the photoelectric conversion component, the high-speed amplification circuit is a concrete form of the amplification component, the display control circuit is a concrete form of the display component, and the related control software is some test programs for realizing the test, such as a current signal executed by the main control chip and received by the photoelectric conversion circuit, a program for obtaining the power value of the optical signal based on the current signal and a specific function, and the like.

The first upper computer, the first oscilloscope, the first module to be measured, and the second upper computer, the second oscilloscope, and the second optical module to be measured, which are described later, are only used for convenience of description of the same module in different test scenes, and are not used for limiting the present invention.

In the practical application process, the detection system can be used for obtaining performance indexes of the receiving end of the optical module, such as photoelectric recovery time, photoelectric recovery quality, SD/LOS response/de-response delay, time required by the optical module to be tested to be capable of outputting a stable output voltage signal, and the like.

The detection system is described by taking the photoelectric recovery time, the photoelectric recovery quality and the response/de-response delay of SD/LOS as examples.

Specifically, the controllable light source provides a first optical signal with the same power to the detection device and the first module to be detected through the optical splitter;

then, a photoelectric conversion circuit in the detection device receives the first optical signal, converts the first optical signal into a first current signal, transmits the first current signal to a main control chip and a high-speed amplification circuit in the detection device, then the main control chip samples (or performs analog-to-digital conversion) the first current signal according to a set frequency to obtain a digital signal corresponding to the first current signal, substitutes the digital signal into a specific function to perform conversion to obtain a power value of the first optical signal, transmits the power value to a display control circuit or uploads the power value to a first upper computer through a USB interface, and the display control circuit displays the power value on a liquid crystal screen or the first upper computer to display the power value of the first optical signal; the high-speed amplifying circuit converts the first current signal into a first voltage signal, amplifies the first voltage signal, and outputs the amplified first voltage signal to a first oscilloscope through the SMA interface, the first oscilloscope also needs to receive a voltage signal output by a receiving end of the first module to be measured, and the amplified first voltage signal and the output voltage signal are compared in the first oscilloscope, so that a tester can observe and obtain the photoelectric recovery time and the photoelectric recovery quality of the first module to be measured; the first oscilloscope can also receive an SD/LOS signal fed back by the first to-be-detected light module under the first light signal, so that a tester can observe whether the SD/LOS response/de-response delay of the first to-be-detected light module meets the requirement.

The detection device provided by the invention can mainly realize the following two functions: on one hand, the photoelectric recovery performance of the receiving end of the optical module to be tested can be tested by comparing the voltage signal output by the inspection equipment with the voltage signal output by the optical module to be tested; on the other hand, can make the tester learn the input optical power size when testing at present through the demonstration of input optical power, through adjusting the attenuator, test under the input optical power size of difference to accelerate test speed. The detection system formed by the detection equipment provided by the embodiment of the invention can replace the functions of an optical power meter, an expensive photoelectric converter and a complex optical path environment in the burst receiving test of the traditional optical module through a simple circuit. The test environment is simplified, the test cost is reduced, and the test speed is accelerated.

In the above detection system, the detection system may further be configured to detect a settling time of an input voltage signal of the RSSI sampling circuit, and a process of the detection is substantially the same as the detection of the photoelectric recovery time and the photoelectric recovery quality, where the difference is that: in the first oscilloscope, the amplified first voltage signal is compared with the input voltage signal of the ADC sampling circuit of the first to-be-detected optical module RSSI, so that the time required for the to-be-detected optical module to be able to output a stable output voltage signal when the optical signal is a time-division burst optical signal can be obtained. In this embodiment, the detection device provided by the present invention can mainly achieve the following two functions: on one hand, the input optical power of the optical module to be tested can be tested by the invention, and the RSSI reporting accuracy of the optical module is obtained by comparing the input optical power with the RSSI reporting value of the optical module; it should be noted that the RSSI reported value here is the power value of the optical signal received by the optical module to be measured. And comparing the power value measured by the detection equipment with the power value collected and reported by the RSSI ADC of the optical module to be detected, so as to obtain the RSSI reporting accuracy. On the other hand, whether the response condition of the optical module to be tested facing the burst optical signal meets the requirement or not can be tested by comparing the input electric signal with the RSSI ADC input electric signal of the optical module. In the detection device provided by the embodiment of the invention, a simple circuit can replace the functions of an optical power meter, an expensive photoelectric converter and a complex light path environment in the RSSI test of the optical module. The test environment is simplified, the test cost is reduced, and the test speed is accelerated.

As another alternative embodiment, based on the foregoing detection device, an embodiment of the present invention further provides an optical module transmitting end performance detection system, as shown in fig. 4, which shows a schematic structural diagram of an optical module transmitting end performance detection system formed by using the detection device provided in the embodiment of the present invention, and in fig. 4, the transmitting end performance detection system 40 includes: the detection device 10 of any one of the preceding claims, a second upper computer 401, an optical fiber 402, a second oscilloscope 403, and a second optical module to be detected 404, wherein,

the detection device is connected with the second upper computer, and is configured to report second test data to the second upper computer and/or receive a second control instruction issued by the second upper computer, and generate at least one of the following signals based on the second control instruction: a first control signal, a second control signal, and a third control signal; the second test data at least comprises a power value of the second optical signal and the second performance index; the first control signal is used for controlling a bias voltage applied to a photoelectric conversion component in the detection device, the second control signal is used for adjusting the amplification factor of an amplification component in the detection device, and the third control signal is used for adjusting the reference level of the amplification component;

It should be noted that, in the detection system, the detection device is the same as the detection device in the optical module receiving end performance detection system, and the specific structure is not described herein again.

The working principle of the detection system is as follows: the second optical module to be tested emits a second optical signal, the second optical signal is transmitted to the detection device through an optical fiber, the detection device has the same working process with the detection device in the optical module receiving end performance detection system, and the difference in the detection system is that the amplified second voltage signal output by the detection device and received in the second oscilloscope is respectively compared with a power supply voltage signal and a switch voltage signal (Tx _ Disable) for emitting the second optical signal in the second optical module to be tested, so as to obtain the time from the time when the second optical module to be tested starts to be powered on to the time when the second optical module can stably emit the optical signal, the time from the time when the emission switch in the optical module to be tested is closed to the time when the optical module to be tested can stably emit the optical signal, and the time from the time when the emission switch in the optical module to be tested is opened to the time when the optical module to be tested completely stops emitting the optical signal, the method is used for testing the response speed of the optical module to be tested facing to the sudden power-on and the switching characteristic condition of a transmitting switch in the optical module to be tested.

In this test situation, the detection device provided by the present invention can mainly realize the following two functions: on one hand, the emitted light power of the optical module to be tested can be tested by the invention; on the other hand, the timing sequence test items of the transmitting end such as Tx _ On (power-up, i.e. the transmitting optical switch is closed), Tx _ off (power-off, i.e. the transmitting optical switch is opened), initialization time and the like of the optical module to be tested can be tested through the comparison of the electrical signals. In the detection device provided by the embodiment of the invention, a simple circuit can replace the functions of an optical power meter, an expensive photoelectric converter and a complex optical path environment in the test of the transmitting end of the optical module. The test environment is simplified, the test cost is reduced, and the test speed is accelerated.

Based on the foregoing detection device, an embodiment of the present invention further provides an optical module performance detection method, as shown in fig. 5, which illustrates a flowchart of the optical module performance detection method provided in the embodiment of the present invention, and in fig. 5, a specific flow of the method includes:

s501: receiving an optical signal and converting the optical signal into a current signal; the optical signal is transmitted or received by an optical module to be tested;

s502: obtaining a power value of the optical signal based on the current signal and a specific function;

s503: converting the current signal into a voltage signal, amplifying the voltage signal according to a set multiple, and comparing the amplified voltage signal with a voltage signal related to the optical signal in the optical module to be tested to obtain a performance index of the optical module to be tested under the power value;

s504: evaluating the specific performance of the optical module to be tested based on the performance index; the specific property is determined by the correlated voltage signal.

It should be noted that, in some embodiments, the related voltage signal includes at least one of: a supply voltage signal, a switch voltage signal, an output voltage signal, an SD/LOS voltage signal, a received signal strength indicating an input voltage signal of an RSSI sampling circuit.

In some embodiments, for S502, may include:

It should be noted that the optical module performance testing method provided by the embodiment of the present invention is based on the foregoing detection device 10, in other words, the testing method and the foregoing detection device belong to the same inventive concept, and how to test a certain performance index in an optical module to be tested, and the meanings of the terms appearing herein have been described in detail in the foregoing, and are not described again here.

The optical module performance detection device, the optical module performance detection method and the optical module performance detection system provided by the embodiment of the invention can provide more performance index tests for the optical module in a smaller size, realize the function of one machine with multiple purposes, are convenient to carry and can meet the requirements of optical module performance tests under various emergency conditions; moreover, compared with the traditional optical module performance test mode, the detection equipment has lower cost.

The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A light module performance detection device, the detection device comprising: a photoelectric conversion component, a control component, an amplification component and an interface component, wherein,

the control component is used for receiving the current signal and obtaining the power value of the optical signal based on the current signal and a specific function; the obtaining the power value of the optical signal based on the current signal and a specific function includes: performing analog-to-digital conversion on the current signal according to a set frequency to obtain a digital signal corresponding to the current signal; substituting the digital signal into the specific function to convert the power value of the optical signal; wherein the specific function is used for reflecting the corresponding relation between the power of the digital signal and the power of the optical signal;

2. The apparatus according to claim 1, wherein the detection apparatus further comprises a power control component, respectively connected to the control component and the photoelectric conversion component, for controlling a bias voltage applied to the photoelectric conversion component based on a first control signal sent by the control component;

3. The device according to claim 2, wherein the control component is connected to an upper computer, and is configured to report test data to the upper computer and/or receive a control instruction issued by the upper computer, and generate at least one of the following signals based on the control instruction: a second control signal, a third control signal, and the first control signal; the test data at least comprises a power value of the optical signal and the performance index; the second control signal is used for adjusting the amplification factor of the amplification component; the third control signal is used to adjust a reference level of the amplifying component.

4. The apparatus of claim 3, wherein the photoelectric conversion component is a PIN photodiode or an Avalanche Photodiode (APD);

the interface component comprises a first interface and a second interface, wherein the first interface is a Universal Serial Bus (USB) interface or an internal integrated circuit (I2C) interface and is used for connecting the control component with the upper computer; the second interface is an SMA interface and is used for outputting the amplified voltage signal converted by the amplifying assembly; the SMA interface is a subminiature version A interface.

5. The apparatus of claim 3, wherein the control assembly comprises: a processor and a memory for storing a computer program operable on the processor, wherein the processor is operable to perform at least one of the following steps when executing the computer program:

sending a first control signal to the power control component;

sending the power value to the display component;

6. A method for detecting performance of an optical module is characterized by comprising the following steps:

evaluating the specific performance of the optical module to be tested based on the performance index; the specific property is determined by the correlated voltage signal;

the obtaining the power value of the optical signal based on the current signal and a specific function includes:

7. The method of claim 6, wherein the correlated voltage signal comprises at least one of: a supply voltage signal, a switch voltage signal, an output voltage signal, an SD/LOS voltage signal, a received signal strength indicating an input voltage signal of an RSSI sampling circuit.

8. An optical module receiving end performance detection system, characterized in that, the detection system includes: the detection apparatus of any one of claims 1 to 5, a first upper computer, a controllable light source, a beam splitter, a first oscilloscope, and a first module to be detected, wherein,

the detection equipment is connected with the first oscilloscope and used for receiving a first optical signal, converting the first optical signal into a first current signal and obtaining the power value of the first optical signal based on the first current signal and a specific function; converting the first current signal into a first voltage signal, amplifying the first voltage signal according to a set multiple, and outputting the amplified first voltage signal to the first oscilloscope; the obtaining the power value of the first optical signal based on the first current signal and a specific function includes: performing analog-to-digital conversion on the first current signal according to a set frequency to obtain a first digital signal corresponding to the first current signal; substituting the first digital signal into the specific function to convert the power value of the first optical signal; wherein the specific function is used for reflecting the corresponding relation between the power of the first digital signal and the power of the first optical signal;

9. An optical module transmitting end performance detection system, characterized in that the detection system comprises: the test apparatus of any one of claims 1 to 5, a second upper computer, an optical fiber, a second oscilloscope, and a second optical module under test, wherein,

the detection equipment is connected with the second optical module to be detected through the optical fiber and is used for receiving a second optical signal emitted by the second optical module to be detected and converting the second optical signal into a second current signal; obtaining a power value of the second optical signal based on the second current signal and a specific function; converting the second current signal into a second voltage signal, amplifying the second voltage signal according to a set multiple, and outputting the amplified second voltage signal to the second oscilloscope; the obtaining the power value of the second optical signal based on the second current signal and a specific function includes: performing analog-to-digital conversion on the second current signal according to a set frequency to obtain a second digital signal corresponding to the second current signal; substituting the second digital signal into the specific function to convert the power value of the second optical signal; wherein the specific function is used for reflecting the corresponding relation between the power of the second digital signal and the power of the second optical signal;

the second oscilloscope is connected to the detection device and the second optical module to be tested, and is configured to receive the amplified second voltage signal sent by the detection device and receive a voltage signal in the second optical module to be tested, where the voltage signal is related to the second optical signal, compare the amplified second voltage signal with the voltage signal related to the second optical signal, and obtain a second performance index of the second optical module to be tested at the power value;