CN113418601A - Optical power detection module - Google Patents
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- CN113418601A CN113418601A CN202110969760.3A CN202110969760A CN113418601A CN 113418601 A CN113418601 A CN 113418601A CN 202110969760 A CN202110969760 A CN 202110969760A CN 113418601 A CN113418601 A CN 113418601A
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Abstract
The application provides an optical power detection module, which comprises an interface circuit, an optical power acquisition and conversion circuit and a control circuit; the first end of the interface circuit is respectively connected with the first end of the optical power acquisition and conversion circuit and the first end of the control circuit, and the interface circuit is used for providing a working power supply required by the work for the optical power acquisition and conversion circuit and the control circuit; the second end of the optical power acquisition and conversion circuit is connected with the second end of the control circuit, and the optical power acquisition and conversion circuit is used for acquiring the photocurrent of an optical signal to be detected, converting the photocurrent into a voltage signal and transmitting the voltage signal to the control circuit; and the third end of the control circuit is connected with the second end of the interface circuit, and the control circuit is used for generating an optical power value according to the voltage signal and carrying out serial data transmission on the optical power value. Therefore, the hardware cost of the module can be reduced, and the module can be used on any port matched with the interface circuit, so that the application range of the module is enlarged.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to an optical power detection module.
Background
With the development of optical communication technology, optical power needs to be detected in the occasions of testing optical channel application and producing optical devices and optical modules. At present, the existing optical power detection method is usually performed by using an optical power detection tool, such as a handheld optical power meter or a power tester. However, the existing optical power detection tools still have great limitations due to the large volume and high hardware cost of these optical power detection tools.
Disclosure of Invention
The application provides an optical power detection module to solve the great and hardware cost of current optical power detection instrument volume and be higher, have the problem of great limitation.
In a first aspect, the present application provides an optical power detection module, which includes an interface circuit, an optical power acquisition and conversion circuit, and a control circuit;
the first end of the interface circuit is respectively connected with the first end of the optical power acquisition and conversion circuit and the first end of the control circuit, and the interface circuit is used for providing a working power supply required by working for the optical power acquisition and conversion circuit and the control circuit;
the second end of the optical power acquisition and conversion circuit is connected with the second end of the control circuit, and the optical power acquisition and conversion circuit is used for acquiring the photocurrent of an optical signal to be detected, converting the photocurrent into a voltage signal and transmitting the voltage signal to the control circuit;
and the third end of the control circuit is connected with the second end of the interface circuit, and the control circuit is used for generating an optical power value according to the voltage signal and carrying out serial data transmission on the optical power value.
Optionally, the interface circuit includes an interface sub-circuit, a slow start sub-circuit, and a voltage division sub-circuit;
the power supply output end of the interface sub-circuit is connected with the input end of the slow start sub-circuit, and the output end of the slow start sub-circuit is connected with the input end of the voltage dividing sub-circuit; the output end of the voltage dividing sub-circuit is used as the first end of the interface circuit and is respectively connected with the first end of the optical power collecting and converting circuit and the first end of the control circuit.
Optionally, the slow start sub-circuit comprises a field effect transistor, a first resistor and a first capacitor;
the power output end of the interface sub-circuit is respectively connected with the source level of the field effect transistor and the first end of the first capacitor, the grid of the field effect transistor is respectively connected with the second end of the first capacitor and the first end of the first resistor, the second end of the first resistor is connected with the grounding end, and the drain electrode of the field effect transistor serves as the output end of the slow start sub-circuit and is connected with the input end of the voltage division sub-circuit.
Optionally, the voltage dividing sub-circuit includes a first magnetic ring, a second capacitor, a third capacitor and a fourth capacitor;
the output end of the slow start sub-circuit is respectively connected with the first end of the second capacitor, the first end of the first magnetic ring and the first end of the second magnetic ring, the second end of the first magnetic ring is respectively connected with the first end of the third capacitor and the first sub-output end, the second end of the second magnetic ring is respectively connected with the first end of the fourth capacitor and the second sub-output end, and the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are respectively connected with the ground terminal; the first sub-output end and the second sub-output end are used as output ends of the voltage dividing sub-circuit, the first sub-output end is connected with a first end of the optical power collecting and converting circuit, and the second sub-output end is connected with a first end of the control circuit.
Optionally, the optical power collecting and converting circuit includes: the optical power acquisition sub-circuit and the converter circuit;
the output end of the optical power acquisition sub-circuit is connected with the input end of the converter circuit, and the output end of the converter circuit is used as the second end of the optical power acquisition and conversion circuit and is connected with the third end of the control circuit;
the optical power collecting sub-circuit is used for converting the collected optical signal to be detected into the photocurrent, and the converter circuit is used for converting the photocurrent into a voltage signal.
Optionally, the optical power collecting and converting circuit further includes: a filter sub-circuit;
the output end of the optical power acquisition sub-circuit is respectively connected with the first end of the filter sub-circuit and the input end of the converter sub-circuit, and the second end of the filter sub-circuit is connected with the ground end;
the filtering sub-circuit is used for filtering the photocurrent output by the optical power collecting sub-circuit.
Optionally, the converter circuit comprises: the circuit comprises a first chip, a second resistor and a third resistor;
the first end of the interface circuit is connected with the first end of the first chip, and the interface circuit is used for providing a working power supply required by working for the first chip;
the output end of the optical power acquisition sub-circuit is connected with the second end of the first chip, and the first chip is used for converting the photocurrent output by the output end of the optical power acquisition sub-circuit into a voltage signal;
the second resistor and the third resistor are connected in parallel, and a first end of the second resistor and a first end of the third resistor are respectively connected with a third end of the first chip; the second end of the third resistor and the output end of the conversion transformer circuit are respectively connected with the fourth end of the first chip; and the second end of the second resistor is connected with the grounding end.
Optionally, the control circuit comprises a second chip;
the first end of the second chip is used as the first end of the control circuit and is connected with the first end of the interface circuit, and the interface circuit is used for providing a working power supply required by working for the second chip;
the second end of the second chip is used as the second end of the control circuit and is connected with the second end of the optical power acquisition and conversion circuit, and the second chip is used for receiving the voltage signal and determining the optical power value corresponding to the optical signal to be detected according to the voltage signal;
and the third end of the second chip is used as the third end of the control circuit and is connected with the second end of the interface circuit, and the interface circuit is used for carrying out serial data transmission on the optical power value.
Optionally, the second terminal of the interface circuit comprises a first sub-terminal for transmitting a serial data signal and a second sub-terminal for transmitting a serial clock signal.
Optionally, the optical power detection module further includes: a voltage follower circuit;
the input end of the voltage following circuit is connected with the second end of the light power collecting and converting circuit, and the output end of the voltage following circuit is connected with the second end of the control circuit.
In the embodiment of the application, an external power supply can be introduced from an external interface connected with the interface circuit through the interface circuit, and a required working power supply is provided for the optical power acquisition and conversion circuit and the control circuit, and an independent power supply module is not required to be arranged in the module for supplying power. Meanwhile, serial data transmission can be carried out on the optical power value output by the control circuit through the interface circuit, an external interface connected with the interface circuit can conveniently acquire the detected optical power value, and an independent display module is not required to be arranged in the module to display the optical power value. Therefore, the internal circuit structure of the module can be simplified, the hardware cost of the module is reduced, and the module can be used on any port matched with the interface circuit, so that the application range of the module is enlarged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic view of a topology structure of an optical power detection module according to an embodiment of the present disclosure;
fig. 2 is a preferred topology structure diagram of an interface circuit provided in an embodiment of the present application;
fig. 3 is a preferred topology structure diagram of an optical power collecting and converting circuit provided in the embodiment of the present application;
fig. 4 is a preferred topology structure diagram of a control circuit provided in an embodiment of the present application;
fig. 5 is a second schematic view illustrating a topology structure of an optical power detection module according to an embodiment of the present disclosure;
fig. 6 is a preferred topology structure diagram of a voltage follower circuit provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this embodiment, an optical power detection module is provided, and fig. 1 is a schematic view of a topology structure of the optical power detection module provided in this embodiment. As shown in fig. 1, the optical power detection module includes an interface circuit 100, an optical power collecting and converting circuit 200 and a control circuit 300;
the first end of the interface circuit 100 is connected to the first end of the optical power collecting and converting circuit 200 and the first end of the control circuit 300, respectively, and the interface circuit 100 is configured to provide a working power supply for the optical power collecting and converting circuit 200 and the control circuit 300;
the second end of the optical power collecting and converting circuit 200 is connected to the second end of the control circuit 300, and the optical power collecting and converting circuit 200 is used for collecting the photocurrent of the optical signal to be detected, converting the photocurrent into a voltage signal, and transmitting the voltage signal to the control circuit 300;
the third terminal of the control circuit 300 is connected to the second terminal of the interface circuit 100, and the control circuit 300 is configured to generate an optical power value according to the voltage signal and perform serial data transmission on the optical power value.
It should be noted that the interface circuit 100 may communicate with an external interface according to a corresponding communication protocol to implement the introduction of the external power source and the communication of data. Specifically, an external power source may be introduced through a first terminal of the interface circuit 100, and data inside the optical power detection module (hereinafter, referred to as a module) may be serially output through a second terminal of the interface circuit 100. In particular, the interface circuit 100 may communicate with an external interface using the SFF-8472 protocol.
The optical power collecting and converting circuit 200 may receive the working power output from the first end of the interface circuit 100 through the first end, and the optical power collecting and converting circuit 200 may collect the optical power of the optical signal to be detected to obtain the photocurrent of the optical signal to be detected, convert the photocurrent to obtain the voltage signal corresponding to the optical signal to be detected, and finally output the voltage signal to the control circuit 300 through the second end of the optical power collecting and converting circuit 200.
The control circuit 300 may receive the working power output from the first end of the interface circuit 100 through the first end, the control circuit 300 may perform analog-to-digital conversion on the voltage signal to obtain a discrete voltage value, and then may obtain an optical power value of the optical signal to be detected through a mapping relationship between an internal preset voltage value and the optical power value, thereby implementing an optical power detection function of the module. Since the third terminal of the control circuit 300 (i.e., the terminal of the output optical power value in the control circuit 300) is connected to the second terminal of the interface circuit 100 (i.e., the terminal of the interface circuit 100 for serial data transmission), the optical power value can be serially output to an external port through the interface circuit 100.
In this embodiment, an external power source may be introduced through the interface circuit 100 from an external interface connected to the interface circuit 100, and a required working power source may be provided for the optical power collecting and converting circuit 200 and the control circuit 300, without providing a separate power module in the module for supplying power. Meanwhile, serial data transmission can be performed on the optical power value output by the control circuit 300 through the interface circuit 100, so that an external interface connected with the interface circuit 100 can conveniently acquire the detected optical power value, and an independent display module is not required to be arranged in the module to display the optical power value. Thus, the internal circuit structure of the module can be simplified, the hardware cost of the module can be reduced, and the module can be used on any port matched with the interface circuit 100, so that the application range of the module is enlarged.
Optionally, the interface circuit 100 includes an interface sub-circuit 110, a slow start sub-circuit 120, and a voltage division sub-circuit 130;
the power output end of the interface sub-circuit 110 is connected to the input end of the slow start sub-circuit 120, and the output end of the slow start sub-circuit 120 is connected to the input end of the voltage dividing sub-circuit 130; the output terminal of the voltage dividing sub-circuit 130 is used as the first terminal of the interface circuit 100, and is connected to the first terminal of the optical power collecting and converting circuit 200 and the first terminal of the control circuit 300, respectively.
Referring to fig. 2, the interface sub-circuit 110 may be formed of J1-a and JI-B together, which have 20PIN PINs, such that the 20PIN of the interface sub-circuit 110 is compatible with the 20PIN PINs of the SFP + optical module, and connects to the standard optical module connector. The power output end of the interface circuit 100 can output VCCIN power voltage, the input end of the slow start sub-circuit 120 is connected with the power output end of the interface circuit 100, and the input end of the slow start sub-circuit can be used for slowly starting the VCCIN power voltage when the interface sub-circuit 110 is connected with an external port, so that the situation that the impact current is too large and the module is damaged is avoided. Thus, the hot plug function of the module can be realized by slowly starting the sub-circuit 120.
The output end of the slow start sub-circuit 120 is connected to the input end of the voltage dividing sub-circuit 130, and the voltage dividing sub-circuit 130 can divide the VCCIN power voltage into multiple paths of voltages for output, so as to provide the working power supply required by the operation for the circuits in the module.
Optionally, the soft start sub-circuit 120 comprises a field effect transistor Q1, a first resistor R13 and a first capacitor C3;
the power output end of the interface sub-circuit 110 is connected to the source of the fet Q1 and the first end of the first capacitor C3, the gate of the fet Q1 is connected to the second end of the first capacitor C3 and the first end of the first resistor R13, the second end of the first resistor R13 is connected to the ground, and the drain of the fet Q1 is connected to the input of the voltage divider sub-circuit 130 as the output of the slow start sub-circuit 120.
In one embodiment, the fet Q1 may be implemented using NTS4101PT1G chips. When the power output terminal of the interface sub-circuit 110 outputs the VCCIN power voltage, the VCCIN power voltage first charges the first capacitor C3, so that the voltage difference between the gate and the source of the fet Q1 gradually increases, and when the voltage difference between the gate and the source of the fet Q1 reaches the threshold, the fet Q1 can be turned on. Therefore, a certain time is needed for connecting the VCCIN power supply voltage to the actual conduction of the field effect transistor Q1, and therefore the slow starting function of the voltage can be achieved. Because the module has the slow start function, the module can perform hot plug even under the condition that the external port is powered on, and cannot be damaged due to impact current generated by hot plug.
Optionally, the voltage dividing sub-circuit 130 includes a first magnetic ring L2, a second magnetic ring L3, a second capacitor C4, a third capacitor C6, and a fourth capacitor C5;
the output end of the slow start sub-circuit 120 is connected with the first end of the second capacitor C4, the first end of the first magnetic ring L2 and the first end of the second magnetic ring L3, the second end of the first magnetic ring L2 is connected with the first end of the third capacitor C6 and the first sub-output end, the second end of the second magnetic ring L3 is connected with the first end of the fourth capacitor C5 and the second sub-output end, and the second end of the second capacitor C4, the second end of the third capacitor C6 and the second end of the fourth capacitor C5 are connected with the ground end; the first sub-output terminal and the second sub-output terminal are used as the output terminals of the voltage dividing sub-circuit 130, the first sub-output terminal is connected to the first terminal of the optical power collecting and converting circuit 200, and the second sub-output terminal is connected to the first terminal of the control circuit 300.
In an embodiment, the voltage dividing sub-circuit 130 converts the power voltage output by the output terminal of the slow start sub-circuit 120 into two power voltage outputs, and the two power voltage outputs are respectively connected to the optical power collecting and converting circuit 200 and the control circuit 300 through the first sub-output terminal and the second sub-output terminal, so as to provide the working power supply required by the operation of the optical power collecting and converting circuit 200 and the control circuit 300. The second capacitor C4, the third capacitor C6 and the fourth capacitor C5 are connected in parallel at different positions of the voltage dividing sub-circuit 130 for filtering at different positions in the circuit. The first magnetic ring L2 and the second magnetic ring L3 may be implemented by BLM15EG221SN 1D. The first magnetic ring L2 and the second magnetic ring L3 are used for suppressing high-frequency noise and spike interference on two paths of power supply voltages and absorbing electrostatic pulses, so that the interference of power supply signals can be effectively reduced, and the stability of the power supply voltages is improved.
Optionally, the optical power collecting and converting circuit 200 includes: an optical power collection sub-circuit 210 and a converter circuit 220;
wherein, the output end of the optical power collecting sub-circuit 210 is connected with the input end of the converter circuit 220, and the output end of the converter circuit 220 is used as the second end of the optical power collecting and converting circuit 200 and is connected with the third end of the control circuit 300;
the optical power collecting sub-circuit 210 is configured to convert the collected optical signal to be detected into a photocurrent, and the converter circuit 220 is configured to convert the photocurrent into a voltage signal.
Referring to fig. 3, the optical power collecting sub-circuit 210 is an optical signal receiving port of the module, and an external optical signal to be detected can be converted into an electrical signal through the optical power collecting sub-circuit 210. Specifically, the optical power collecting sub-circuit 210 is a photodiode, which operates under the action of a reverse voltage, generates a photocurrent when irradiated by the light to be detected, outputs the photocurrent to the converter circuit 220, converts the photocurrent into a voltage signal through the converter circuit 220, and facilitates subsequent analysis of the voltage signal through the control circuit 300 to obtain an optical power value of the optical signal to be detected.
Optionally, the optical power collecting and converting circuit 200 further includes: a filtering sub-circuit 230;
the output end of the optical power collecting sub-circuit 210 is connected to the first end of the filter sub-circuit 230 and the input end of the converter sub-circuit 220, respectively, and the second end of the filter sub-circuit 230 is connected to the ground end;
and the filtering sub-circuit 230 is configured to perform filtering processing on the photocurrent output by the optical power acquisition sub-circuit 210.
With continued reference to fig. 3, the filter sub-circuit 230 includes a capacitor C9 and a resistor R16 connected in series, a first terminal of the capacitor C9 is connected to the output terminal of the optical power collecting sub-circuit 210 and the input terminal of the transforming sub-circuit 220, a second terminal of the capacitor C9 is connected to a first terminal of the resistor R16, and a second terminal of the resistor R16 is connected to the ground terminal. Therefore, the filtering sub-circuit 230 can filter the photocurrent output by the optical power collecting sub-circuit 210, remove external noise carried by the photocurrent, and improve the accuracy of collecting the optical signal to be detected.
Optionally, the converter circuit 220 includes: a first chip U2, a second resistor R14 and a third resistor R15;
the first end of the interface circuit 100 is connected to the first end of the first chip U2, and the interface circuit 100 is configured to provide an operating power supply for the first chip U2;
the output end of the optical power collecting sub-circuit 210 is connected to the second end of the first chip U2, and the first chip U2 is configured to convert the photocurrent output by the output end of the optical power collecting sub-circuit 210 into a voltage signal;
the second resistor R14 and the third resistor R15 are connected in parallel, and the first end of the second resistor R14 and the first end of the third resistor R15 are respectively connected with the third end of the first chip U2; the second end of the third resistor R15 and the output end of the conversion rectifier circuit 220 are respectively connected with the fourth end of the first chip U2; a second terminal of the second resistor R14 is connected to ground.
Specifically, the first chip U2 may adopt an ADL5303 chip, and the first chip U2 is configured to logarithmically amplify a photocurrent input from the second terminal (i.e., the inp pin) and output a voltage signal obtained by logarithmically amplifying a current from the third terminal (i.e., the VOUT pin) of the first chip U2. It should be noted that the ADL5303 chip utilizes a logarithmic relationship between the base-emitter voltage and the collector current of the bipolar transistor. With these principles, the input current I applied to the INPT pinPDThe relationship with the voltage appearing at the intermediate output pin VLOG is:
VLOG=VYlog10(IPD/ IZ)；
wherein, VLOGIs the voltage value, I, of the intermediate output pin VLOGPDMagnitude of photocurrent input to INPT pin, VYIs the voltage slope (for a base-10 logarithm, which is also equal to the value of V for every 10 times the voltage), IZIs a fixed current in a logarithmic formula called the intercept point.
Since the second resistor R14 and the third resistor R15 constitute an internal voltage amplifying circuit, the relationship between the voltage of the output pin VOUT and the voltage of the intermediate output pin VLOG is:
Vout= VLOG*（1+R14/R15）；
wherein, VoutFor outputting the voltage value, V, of the pin VOUTLOGFor the voltage value of the intermediate output pin VLOG, R14 represents the resistance value of the second resistor R14, and R15 represents the resistance value of the third resistor R15. Therefore, the collected photocurrent can be amplified to a proper voltage collection interval, and the voltage value of the output pin VOUT is adjusted.
Optionally, the control circuit 300 includes a second chip U1;
a first terminal of the second chip U1 is used as a first terminal of the control circuit 300, and is connected to a first terminal of the interface circuit 100, and the interface circuit 100 is used for providing a working power supply for the second chip U1;
a second end of the second chip U1 is used as a second end of the control circuit 300, and is connected to a second end of the optical power collecting and converting circuit 200, and the second chip U1 is configured to receive the voltage signal and determine an optical power value corresponding to the optical signal to be detected according to the voltage signal;
the third terminal of the second chip U1 is used as the third terminal of the control circuit 300, and is connected to the second terminal of the interface circuit 100, and the interface circuit 100 is used for serial data transmission of the optical power value.
Specifically, referring to fig. 4, the second chip U1 may adopt an EFM8BB21F16G chip to implement control and analysis of the entire optical power detection module. The first terminal (i.e., the VDD pin) of the second chip U1 is used for receiving the power voltage outputted by the interface circuit 100 and providing the operating power for the second chip U1. The second end (i.e., the P1.4 pin) of the second chip U1 is configured to receive the voltage signal output by the optical power collecting and converting circuit 200, and the second chip U1 samples the voltage signal through an internal analog-to-digital conversion unit and calculates the current optical power value through a lookup table inside the second chip U1. The third terminal (i.e., pin P1.2 and pin P1.3) of the second chip U1 includes an SDA data line and an SCL clock line of I2C, and I2C is used for communication between the module and the outside, and may satisfy the SFF-8472 protocol, thereby implementing serial output of optical power values. In addition, the pin P0.5, the pin P0.6, the pin P0.7, the pin P1.0, and the pin P1.1 of the second chip U1 respectively represent different status bits for controlling the optical power detection module, and are used for the upper computer to identify and analyze the optical module.
Optionally, the second terminal of the interface circuit 100 includes a first sub-terminal for transmitting a serial data signal and a second sub-terminal for transmitting a serial clock signal.
The first sub-terminal (i.e. the SDA pin of J1-a) is used to transmit a serial data signal, the second sub-terminal (i.e. the SCL pin of J1-a) is used to transmit a serial clock signal, and the first and second sub-terminals can be connected to the third terminal (i.e. the P1.2 pin and the P1.3 pin) of the second chip U1, thereby enabling serial output of an optical power value.
Referring to fig. 5, fig. 5 is a second schematic view of a topology structure of an optical power detection module according to an embodiment of the present application. The optical power detection module further includes: a voltage follower circuit 400;
the input end of the voltage follower circuit 400 is connected to the second end of the optical power collecting and converting circuit 200, and the output end of the voltage follower circuit 400 is connected to the second end of the control circuit 300.
Referring to fig. 6, the voltage follower circuit 400 includes a MAX4231AXT + T chip, and a resistor and a capacitor at the periphery of the MAX4231AXT + T chip. The CDD pin of the MAX4231AXT + T chip is connected to the first end of the interface circuit 100, and is configured to receive a working power supply output by the first end of the interface circuit 100. An IN + pin of the MAX4231AXT + T chip is connected to the second end of the optical power acquisition and conversion circuit 200, and is configured to receive a voltage signal output by the second end of the optical power acquisition and conversion circuit 200. The OUT pin of the MAX4231AXT + T chip is connected to the second end of the control circuit 300, and is used for transmitting the output voltage signal to the control circuit 300 for analysis. Because the voltage follower circuit 400 has the characteristics of high input impedance and low output impedance, the voltage follower circuit is in a high-impedance state for a previous-stage circuit and in a low-impedance state for a next-stage circuit, so that the effect of isolating the previous-stage circuit from the next-stage circuit is achieved, and a stable voltage signal can be obtained.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The optical power detection module is characterized by comprising an interface circuit, an optical power acquisition and conversion circuit and a control circuit;
the first end of the interface circuit is respectively connected with the first end of the optical power acquisition and conversion circuit and the first end of the control circuit, and the interface circuit is used for providing a working power supply required by working for the optical power acquisition and conversion circuit and the control circuit;
the second end of the optical power acquisition and conversion circuit is connected with the second end of the control circuit, and the optical power acquisition and conversion circuit is used for acquiring the photocurrent of an optical signal to be detected, converting the photocurrent into a voltage signal and transmitting the voltage signal to the control circuit;
and the third end of the control circuit is connected with the second end of the interface circuit, and the control circuit is used for generating an optical power value according to the voltage signal and carrying out serial data transmission on the optical power value.
2. The optical power detection module of claim 1, wherein the interface circuit comprises an interface sub-circuit, a slow start sub-circuit, and a voltage division sub-circuit;
the power supply output end of the interface sub-circuit is connected with the input end of the slow start sub-circuit, and the output end of the slow start sub-circuit is connected with the input end of the voltage dividing sub-circuit; the output end of the voltage dividing sub-circuit is used as the first end of the interface circuit and is respectively connected with the first end of the optical power collecting and converting circuit and the first end of the control circuit.
3. The optical power detection module of claim 2, wherein the slow start sub-circuit comprises a field effect transistor, a first resistor and a first capacitor;
the power output end of the interface sub-circuit is respectively connected with the source level of the field effect transistor and the first end of the first capacitor, the grid of the field effect transistor is respectively connected with the second end of the first capacitor and the first end of the first resistor, the second end of the first resistor is connected with the grounding end, and the drain electrode of the field effect transistor serves as the output end of the slow start sub-circuit and is connected with the input end of the voltage division sub-circuit.
4. The optical power detection module as claimed in claim 2, wherein the voltage division sub-circuit comprises a first magnetic loop, a second capacitor, a third capacitor and a fourth capacitor;
the output end of the slow start sub-circuit is respectively connected with the first end of the second capacitor, the first end of the first magnetic ring and the first end of the second magnetic ring, the second end of the first magnetic ring is respectively connected with the first end of the third capacitor and the first sub-output end, the second end of the second magnetic ring is respectively connected with the first end of the fourth capacitor and the second sub-output end, and the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are respectively connected with the ground terminal; the first sub-output end and the second sub-output end are used as output ends of the voltage dividing sub-circuit, the first sub-output end is connected with a first end of the optical power collecting and converting circuit, and the second sub-output end is connected with a first end of the control circuit.
5. The optical power detection module of claim 1, wherein the optical power collecting and transforming circuit comprises an optical power collecting sub-circuit and a transforming sub-circuit;
the output end of the optical power acquisition sub-circuit is connected with the input end of the converter circuit, and the output end of the converter circuit is used as the second end of the optical power acquisition and conversion circuit and is connected with the third end of the control circuit;
the optical power collecting sub-circuit is used for converting the collected optical signal to be detected into the photocurrent, and the converter circuit is used for converting the photocurrent into a voltage signal.
6. The optical power detection module of claim 5, wherein the optical power harvesting and converting circuit further comprises: a filter sub-circuit;
the output end of the optical power acquisition sub-circuit is respectively connected with the first end of the filter sub-circuit and the input end of the converter sub-circuit, and the second end of the filter sub-circuit is connected with the ground end;
the filtering sub-circuit is used for filtering the photocurrent output by the optical power collecting sub-circuit.
7. The optical power detection module of claim 5, wherein the converter circuit comprises: the circuit comprises a first chip, a second resistor and a third resistor;
the first end of the interface circuit is connected with the first end of the first chip, and the interface circuit is used for providing a working power supply required by working for the first chip;
the output end of the optical power acquisition sub-circuit is connected with the second end of the first chip, and the first chip is used for converting the photocurrent output by the output end of the optical power acquisition sub-circuit into a voltage signal;
the second resistor and the third resistor are connected in parallel, and a first end of the second resistor and a first end of the third resistor are respectively connected with a third end of the first chip; the second end of the third resistor and the output end of the conversion transformer circuit are respectively connected with the fourth end of the first chip; and the second end of the second resistor is connected with the grounding end.
8. The optical power detection module of claim 1, wherein the control circuit comprises a second chip;
the first end of the second chip is used as the first end of the control circuit and is connected with the first end of the interface circuit, and the interface circuit is used for providing a working power supply required by working for the second chip;
the second end of the second chip is used as the second end of the control circuit and is connected with the second end of the optical power acquisition and conversion circuit, and the second chip is used for receiving the voltage signal and determining the optical power value corresponding to the optical signal to be detected according to the voltage signal;
and the third end of the second chip is used as the third end of the control circuit and is connected with the second end of the interface circuit, and the interface circuit is used for carrying out serial data transmission on the optical power value.
9. The optical power detection module of claim 8, wherein the second terminal of the interface circuit comprises a first sub-terminal for transmitting a serial data signal and a second sub-terminal for transmitting a serial clock signal.
10. The optical power detection module of claim 1, further comprising: a voltage follower circuit;
the input end of the voltage following circuit is connected with the second end of the light power collecting and converting circuit, and the output end of the voltage following circuit is connected with the second end of the control circuit.
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