An optical module and a gain compensation table acquisition system

Abstract

This application discloses an optical module and a system for acquiring a gain compensation table. The optical module includes an RF amplifier, a temperature sampling circuit, an MCU, and an attenuation circuit. The RF amplifier amplifies electrical signals. The temperature sampling circuit acquires the real-time temperature value of the RF amplifier. The MCU's register stores the real-time temperature value of the RF amplifier and the gain compensation table. The MCU acquires the real-time temperature value of the RF amplifier during the optical module's startup process and outputs a compensation voltage based on the real-time temperature value of the RF amplifier and the gain compensation table. The attenuation circuit obtains the attenuation value corresponding to the compensation voltage. In this application, the MCU obtains different compensation voltages corresponding to different real-time temperature values ​​of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table. The attenuation circuit obtains different attenuation values ​​corresponding to different compensation voltages, thus stabilizing the output level of the optical module at different temperatures.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to an optical module and a system for obtaining a gain compensation table. Background Technology

[0002] The main function of a video receiving optical module is to convert optical signals into electrical signals and amplify these minute electrical signals. The radio frequency (RF) amplifier is the core component responsible for amplifying these minute electrical signals. During the startup process of the video receiving optical module, the RF amplifier experiences a significant temperature change within a short period. This temperature change during startup can cause a fluctuation of approximately 3dB in the output level of the video receiving optical module, potentially adversely affecting downstream receiving equipment.

[0003] Currently, the industry-standard solution to the problem of fluctuating output levels in video receiving optical modules is to add a constant compensation voltage. This solution can compensate for the fluctuations in output levels during startup to some extent, but the output level during startup still fluctuates from the actual stable output level, which can easily cause stripes in downstream receiving and display devices, affecting the customer experience. Summary of the Invention

[0004] This application provides a system for obtaining an optical module and a gain compensation table, which makes the output level of the optical module stable at different temperatures.

[0005] An optical module, comprising:

[0006] The optical receiving submodule is used to convert the received optical signal into an electrical signal;

[0007] The radio frequency amplifier is located at the output of the optical receiver submodule and is used to amplify the electrical signal to form an amplified electrical signal.

[0008] Temperature sampling circuit, used to acquire real-time temperature values ​​of the RF amplifier;

[0009] The MCU, with its first terminal connected to the temperature sampling circuit, includes a first register and a second register;

[0010] The first register is used to store the real-time temperature value of the RF amplifier;

[0011] The second register is used to store the gain compensation table, which is obtained based on the preset output level, the real-time output level and the real-time temperature value of the RF amplifier. The preset output level and the real-time output level are both the output levels of the optical module. The preset output level is the real-time output level of the optical module when the startup time of the optical module reaches the preset time.

[0012] The MCU is used to obtain the real-time temperature value of the RF amplifier during the startup process of the optical module, and also to output the compensation voltage corresponding to the real-time temperature value of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table.

[0013] The attenuation circuit is located at the output of the RF amplifier. Its first terminal is connected to the second terminal of the MCU. It is used to obtain the attenuation value corresponding to the compensation voltage based on the compensation voltage.

[0014] A system for obtaining a gain compensation table, comprising:

[0015] Optical module;

[0016] The test host is connected to the MCU at the first end, and is used to read the real-time temperature value of the RF amplifier and write the gain compensation table into the MCU;

[0017] The spectrum analyzer has one end connected to the voltage-controlled attenuator to read the real-time output level and the preset output level, and the other end connected to the second end of the test host to send the real-time output level and the preset output level to the test host.

[0018] The test host is also used to obtain a gain compensation table based on the real-time temperature value of the RF amplifier, the preset output level, the real-time output level, and the principle of voltage-controlled attenuator.

[0019] Beneficial Effects: This application provides an optical module, including an optical receiving sub-module, an RF amplifier, a temperature sampling circuit, an MCU, and an attenuation circuit. The optical receiving sub-module converts the received optical signal into an electrical signal. The RF amplifier, located at the output of the optical receiving sub-module, amplifies the electrical signal to form an amplified electrical signal. The temperature sampling circuit acquires the real-time temperature value of the RF amplifier. The MCU, with its first terminal connected to the temperature sampling circuit, includes a first register and a second register. The first register stores the real-time temperature value of the RF amplifier. The second register stores a gain compensation table. The gain compensation table is obtained based on a preset output level, a real-time output level, and the real-time temperature value of the RF amplifier. Both the preset output level and the real-time output level are the output levels of the optical module. The preset output level is the real-time output level of the optical module when the startup time reaches a preset time. The MCU reads the real-time temperature value of the RF amplifier during the startup process of the optical module and outputs a compensation voltage corresponding to the real-time temperature value of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table. The MCU obtains the compensation voltage corresponding to different temperatures of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table during the startup process of the optical module and outputs the compensation voltage. An attenuation circuit, located at the output of the RF amplifier, has its first terminal connected to the second terminal of the MCU. It is used to obtain the attenuation value corresponding to the compensation voltage. The attenuation circuit obtains different attenuation values ​​for the RF amplifier at different temperatures based on the compensation voltage corresponding to different temperatures of the RF amplifier. Since the attenuation circuit is located at the output of the RF amplifier, the output level of the optical module is the output level of the RF amplifier minus the attenuation value of the attenuation circuit. Furthermore, because the RF amplifier has different attenuation values ​​at different temperatures, the output level of the optical module is stable at different temperatures. In this application, the MCU has a first register and a second register. The first register stores the real-time temperature value of the RF amplifier, and the second register stores a gain compensation table. The MCU obtains different compensation voltages corresponding to different real-time temperatures of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table during the optical module startup process. The attenuation circuit obtains different attenuation values ​​corresponding to different compensation voltages, thus stabilizing the output level of the optical module at different temperatures. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an optical network unit according to some embodiments;

[0022] Figure 2This is a schematic diagram of the housing structure according to some embodiments;

[0023] Figure 3 This is a partial schematic diagram of an optical network unit according to some embodiments;

[0024] Figure 4 This is a schematic diagram of the structure of an optical transceiver assembly according to some embodiments;

[0025] Figure 5 This is a schematic diagram of a gain compensation circuit for an optical module according to some embodiments;

[0026] Figure 6 A schematic diagram of a temperature sampling circuit according to some embodiments;

[0027] Figure 7 This is a schematic diagram of an attenuation circuit according to some embodiments;

[0028] Figure 8 This is a graph showing the relationship between the real-time output level and the optical module startup time according to some embodiments;

[0029] Figure 9 A graph showing the relationship between the real-time temperature value of the RF amplifier and the startup time of the optical module according to some embodiments;

[0030] Figure 10 This is a graph showing the relationship between the real-time output level and the real-time temperature value of the RF amplifier according to some embodiments;

[0031] Figure 11 This is a schematic diagram of the structure of a gain compensation table acquisition system according to some embodiments;

[0032] Figure 12 This is a flowchart of a gain compensation method according to some embodiments;

[0033] Figure 13 This is a flowchart of a method for obtaining a gain compensation table according to some embodiments. Detailed Implementation

[0034] To facilitate the explanation of the technical solution of the application, some concepts involved in this application will be explained first below.

[0035] In this specification, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a circuit structure, article, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a circuit structure, article, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the circuit structure, article, or device that includes said element.

[0036] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0037] One of the core aspects of fiber optic communication is the conversion between photoelectric and optical signals. Fiber optic communication uses optical signals carrying information to transmit in optical fibers / waveguides, leveraging the passive transmission characteristics of light in optical fibers to achieve low-cost, low-loss information transmission. In contrast, information processing devices such as computers use electrical signals, necessitating the conversion between electrical and optical signals during signal transmission.

[0038] Optical transceiver components, in the field of fiber optic communication technology, realize the aforementioned photoelectric conversion function. The mutual conversion between optical signals and electrical signals is the core function of optical transceiver components. Optical transceiver components achieve electrical connection with external host computers through gold fingers on the circuit board. The main electrical connections include power supply, I2C signals, data transmission signals, and grounding. The gold finger-based electrical connection method has become the standard method in the optical transceiver component industry. Based on this, the circuit board is an essential technical feature in most optical transceiver components.

[0039] Figure 1 This diagram illustrates a common optical network unit. Figure 1As shown, the optical network unit 100 includes: a housing 110, a printed circuit board 300, an optical transceiver assembly 400, and a flexible circuit board 200. The printed circuit board 300, the optical transceiver assembly 400, and the flexible circuit board 200 are disposed within the housing 110. The optical transceiver assembly 400 and the flexible circuit board 200 are disposed on the upper surface of the printed circuit board 300. The structural relationships between the housing 110, the printed circuit board 300, the optical transceiver assembly 400, and the flexible circuit board 200 will be described in detail below.

[0040] The housing 110 shown in this application may include an upper housing 111 and a lower housing 112. The upper housing 111 and lower housing 112 are generally made of metal, which is beneficial for electromagnetic shielding and heat dissipation. The assembly method using the upper housing 111 and lower housing 112 facilitates the installation of components such as the printed circuit board 300 into the housing 111. Generally, the housing 110 of the optical network unit is not made into a single structure, as this would prevent the installation of positioning components, heat dissipation, and electromagnetic shielding structures during the assembly of printed circuit boards and other components, and would also hinder production automation. Further details can be found in the following sections. Figure 2 The upper housing 111 has multiple fins 111a on its surface, and the lower housing 112 has multiple vents 112a on its sidewalls. During operation, the heat generated by the devices in the housing 110 can be diffused through the fins 111a of the upper housing and the vents 112a of the lower housing. Typically, the optical network unit 100 has multiple indicator lights, and the upper housing displays these indicator lights. Figure 2 Multiple indicator light windows 111b are provided at corresponding positions (not shown in the diagram). The upper housing 111 and the lower housing 112 form a storage cavity. This storage cavity is used to encapsulate devices such as the printed circuit board 300 and the optical transceiver assembly 400.

[0041] Figure 3 This is a partial schematic diagram of an optical network unit provided in an embodiment of this application. Figure 4 This is a schematic diagram of the structure of an optical transceiver component provided in an embodiment of this application. (Combined with...) Figure 3 , Figure 4 As shown, the optical transceiver assembly 400 in this embodiment is a three-way BOSA structure, including: a tube body 401, an optical fiber adapter 402, an optical transmitter 403, a first optical receiver 404, and a second optical receiver 405. The optical fiber adapter 402 is disposed on the first side of the tube body 401, and the optical transmitter 403 is disposed on the opposite side of the first side of the tube body. The first optical receiver 404 is disposed on the adjacent side of the first side, and the second optical receiver 405 is disposed on the opposite side of the first optical receiver 404.

[0042] Fiber optic adapter 402 connects to an external optical fiber for receiving or transmitting optical signals from optical transceiver assembly 400. Optical transmitter 403, first optical receiver 404, and second optical receiver 405 are all TO tube structures, electrically connected to the printed circuit board (PCB) via pins. To facilitate the electrical connection between the pins and the PCB and improve the stability of the connection between the optical transceiver assembly 400 and the PCB 300, the pins need to be positioned as close as possible to the corresponding pads on the PCB, reducing the distance between the pins and the corresponding pads, thereby improving the positioning accuracy and connection strength of the pins and the corresponding pads on the PCB.

[0043] Figure 5 This is a schematic diagram of a gain compensation circuit for an optical module according to some embodiments. Figure 6 This is a schematic diagram of a temperature sampling circuit according to some embodiments. Figure 7 This is a schematic diagram of an attenuation circuit according to some embodiments. For example... Figure 5-7 As can be seen, in some embodiments, the optical module includes an optical receiving sub-module, an RF amplifier, a temperature sampling circuit, an MCU, and an attenuation circuit. Specifically,

[0044] The optical receiving submodule is used to convert the received optical signal into an electrical signal.

[0045] The radio frequency amplifier is located at the output of the optical receiver submodule and is used to amplify the electrical signal to form an amplified electrical signal.

[0046] A temperature sampling circuit, located near the RF amplifier, is used to acquire the real-time temperature value of the RF amplifier. Specifically, the temperature sampling circuit includes a first voltage divider resistor, a thermistor, and a second voltage divider resistor. The first terminal of the first voltage divider resistor is connected to the power supply voltage, the second terminal of the first voltage divider resistor is connected to the first terminal of the thermistor, the second terminal of the thermistor is connected to the first terminal of the second voltage divider resistor, and the second terminal of the second voltage divider resistor is grounded. Changes in the temperature of the RF amplifier cause changes in the temperature of the environment in which the RF amplifier is located, resulting in a corresponding change in the resistance of the thermistor located near the RF amplifier. This change in the thermistor's resistance causes a change in the voltage shared by the first voltage divider resistor and the thermistor.

[0047] The MCU, with its first terminal connected to the temperature sampling circuit, is used to acquire the real-time temperature value of the RF amplifier. Specifically, since the first terminal of the MCU is connected to the second terminal of the thermistor, the MCU determines the real-time temperature value of the RF amplifier based on the voltage change shared by the first voltage divider resistor and the thermistor.

[0048] The real-time temperature value of the RF amplifier can be obtained by the MCU through the temperature sampling circuit during the testing process before the optical module leaves the factory, or through the temperature sampling circuit during the startup process of the optical module.

[0049] The MCU includes a first register and a second register.

[0050] The first register is used to store the real-time temperature value of the RF amplifier.

[0051] The MCU acquires the real-time temperature value of the RF amplifier and stores it in the first register. The real-time temperature value of the RF amplifier is determined by the MCU based on the voltage change of the voltage divider resistor and the thermistor.

[0052] Both the MCU and the test host can read the real-time temperature value of the RF amplifier stored in the first register. Specifically, the real-time temperature value of the RF amplifier can be obtained by the MCU through a temperature sampling circuit during the pre-shipment testing of the optical module, or it can be obtained by the MCU through a temperature sampling circuit during the optical module startup process. The real-time temperature value of the RF amplifier obtained during the pre-shipment testing of the optical module is read by the test host. The real-time temperature value of the RF amplifier obtained during the optical module startup process is read by the MCU.

[0053] Since the first register only stores one real-time temperature value of the RF amplifier, when the first register stores the real-time temperature value of the RF amplifier at this moment, and the MCU obtains the real-time temperature value of the RF amplifier at the next moment, the MCU replaces the real-time temperature value of the RF amplifier at this moment with the real-time temperature value of the RF amplifier at the next moment, so that the real-time temperature value of the RF amplifier at the next moment is stored in the first register.

[0054] The second register is used to store the gain compensation table.

[0055] The gain compensation table is written by the test host. The gain compensation table is obtained by the test host based on the preset output level, the real-time output level and the real-time temperature value of the RF amplifier. The preset output level and the real-time output level are both output levels of the optical module read by the test host. The preset output level is the real-time output level of the optical module when the startup time of the optical module reaches the preset time.

[0056] Before the optical module leaves the factory, its first end is connected to the first end of the test host, its second end is connected to the first end of the spectrum analyzer, and the second end of the spectrum analyzer is connected to the second end of the test host. The spectrum analyzer can read the real-time output level and the preset output level. The test host can not only read the real-time temperature value of the RF amplifier stored in the first register of the MCU, but also read the real-time output level and the preset output level through the spectrum analyzer. The test host combines the preset output level, the real-time output level, and the real-time temperature value of the RF amplifier to obtain a gain compensation table. The test host writes the gain compensation table into the second register of the MCU.

[0057] The test host is used to generate a gain compensation table based on the real-time temperature value, real-time output level, and preset output level of the RF amplifier. Specifically, the test host generates the gain compensation table based on the real-time temperature value, real-time output level, preset output level, and voltage-controlled attenuator principle of the RF amplifier.

[0058] The test host obtains the first lookup table based on the real-time temperature value and real-time output level of the RF amplifier.

[0059] The first lookup table is a table showing the relationship between the real-time temperature value and the real-time output level of the RF amplifier. One real-time temperature value of the RF amplifier corresponds to one real-time output level of the optical module.

[0060] The test host obtains the second lookup table based on the first lookup table and the preset output level.

[0061] The second lookup table is a table showing the relationship between the real-time temperature value and the output level difference of the RF amplifier, where the output level difference is the difference between the preset output level and the real-time output level.

[0062] The test host obtains the gain compensation table based on the second lookup table and the principle of voltage-controlled attenuator (VCO). Specifically, the principle of VCO is as follows: the smallest unit DAC value output by the MCU can be considered as 0.1 dB of attenuation, and the higher the voltage, the greater the attenuation, and the lower the voltage, the smaller the attenuation. The test host obtains the gain compensation table based on the second lookup table and the principle of VCO.

[0063] Figure 8 This is a graph showing the relationship between the real-time output level and the optical module startup time according to some embodiments. Figure 9 This is a graph showing the relationship between the real-time temperature of the RF amplifier and the startup time of the optical module, according to some embodiments. Figure 10 This is a graph showing the relationship between the real-time output level and the real-time temperature value of the RF amplifier according to some embodiments. For example... Figure 8 and 9 As shown, during the optical module startup process, both the real-time output level and the real-time temperature value of the RF amplifier monotonically increase over time until the optical module enters a stable state after 120 seconds of startup. Since the preset output level is the real-time output level when the optical module's startup time reaches the preset time, the preset output level is the real-time output level of the optical module after 120 seconds of startup. The preset time is 120 seconds.

[0064] according to Figure 8 and 9 As shown, the relationship between the real-time output level and the real-time temperature value of the RF amplifier during the startup process of the optical module is as follows: Figure 10 As shown. Figure 10As shown, after the real-time temperature value of the RF amplifier reaches 50°C, the real-time output level becomes constant, and when the real-time temperature value of the RF amplifier is 50°C, the real-time output level is the preset output level. When the real-time temperature value of the RF amplifier is between 18°C and 50°C, different real-time temperature values of the RF amplifier correspond to different real-time output levels of the optical module.

[0065] The MCU is not only used to read the real-time temperature value of the RF amplifier during the startup process of the optical module, but also used to output a compensation voltage corresponding to the real-time temperature value of the RF amplifier according to the real-time temperature value of the RF amplifier and the gain compensation table. Specifically, during the startup process of the optical module, the MCU reads the real-time temperature value of the RF amplifier in the first register and the gain compensation table in the second register, and obtains the compensation voltage corresponding to this temperature value from the gain compensation table according to the real-time temperature value of the RF amplifier. Among them, one real-time temperature value of the RF amplifier corresponds to one compensation voltage.

[0066] The MCU is also used to determine whether the real-time temperature value of the RF amplifier is between the first temperature value and the second temperature value. Specifically, since the optical module has an automatic gain compensation function in low-temperature and high-temperature environments, generally the low-temperature environment means T ≤ 15°C, and the high-temperature environment means T ≥ 55°C. In order to avoid conflicts between the gain compensation caused by the gain compensation table and the automatic gain compensation function of the optical module's original high and low temperature environments during the startup process of the optical module, the limiting conditions for entering the gain compensation can be increased. The specific limiting condition is 15°C < T < 55°C. Therefore, after the MCU obtains the real-time temperature value of the RF amplifier, it needs to first determine whether the real-time temperature value of the RF amplifier is between the first temperature value and the second temperature value, where the first temperature value is 15°C and the second temperature value is 55°C.

[0067] Combined with the above description, during the pre-factory test of the optical module, the test host obtains the gain compensation table based on the output level, real-time output level and real-time temperature value of the RF amplifier, and writes the gain compensation table into the second register of the MCU. During the actual use of the optical module (i.e., the startup process of the optical module), the MCU reads the real-time temperature value of the RF amplifier in the first register and the gain compensation table in the second register, and obtains the compensation voltage corresponding to this temperature value from the gain compensation table according to the real-time temperature value of the RF amplifier.

[0068] As Figure 10As shown, different real-time temperature values ​​of the RF amplifier correspond to different real-time output levels of the optical module. If a constant compensation voltage is added to the RF amplifier at different real-time temperature values, the real-time output level at one moment will be equal to the preset output level. However, at the next moment, the real-time output level will no longer be equal to the preset output level. That is, the output level of the optical module during the startup process still fluctuates to some extent from the actual stable output level, which can easily cause stripes to appear on the subsequent receiving display device, affecting the customer experience. To solve this problem, the MCU obtains the compensation voltage corresponding to the real-time temperature value of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table. For example... Figure 10 As shown, different real-time temperature values ​​of the RF amplifier correspond to different real-time output levels of the optical module. If different compensation voltages are applied to different real-time temperature values ​​of the RF amplifier, the real-time output level of the optical module will always be equal to the preset output level during startup, thus avoiding stripe problems in the downstream receiving and display devices and improving the customer experience.

[0069] The attenuation circuit is located at the output of the RF amplifier. Its first terminal is connected to the second terminal of the MCU. It is used to obtain the attenuation value corresponding to the compensation voltage based on the compensation voltage.

[0070] The attenuation circuit includes an operational amplifier and a voltage-controlled attenuator (VCO). The first terminal of the operational amplifier is connected to the second terminal of the MCU, the second terminal of the operational amplifier is connected to the first terminal of the VCO, and the second terminal of the VCO is connected to the first terminal of the spectrum analyzer. The operational amplifier amplifies the compensation voltage to obtain the amplified compensation voltage. The VCO is used to obtain the attenuation value corresponding to the amplified compensation voltage based on the amplified compensation voltage.

[0071] The voltage-controlled attenuator (VCO) obtains a first attenuation value under the action of a reference voltage. When the voltage of the VCO is the sum of the reference voltage and the first compensation voltage, the VCO obtains a second attenuation value under the action of the voltage. When the voltage of the VCO is the sum of the reference voltage and the second compensation voltage, the VCO obtains a third attenuation value under the action of the voltage. In this application, the compensation voltage output by the MCU at different real-time temperature values ​​of the RF amplifier is the first compensation voltage, and the compensation voltage obtained by the MCU based on the real-time temperature value of the RF amplifier and the gain compensation table is the second compensation voltage.

[0072] Without considering the relationship between the real-time temperature and real-time output level of the RF amplifier, the first real-time output level of the optical module is the difference between the RF amplifier's output level and the first attenuation value. Considering the relationship between the RF amplifier's real-time temperature and real-time output level, and assuming the MCU outputs a constant compensation voltage at different real-time temperatures of the RF amplifier, the second real-time output level of the optical module is the difference between the RF amplifier's output level and the second attenuation value. Considering the relationship between the RF amplifier's real-time temperature and real-time output level, and assuming the MCU outputs different compensation voltages at different real-time temperatures of the RF amplifier, the third real-time output level of the optical module is the difference between the RF amplifier's output level and the third attenuation value.

[0073] The first real-time output level of the optical module is as follows Figure 10 As shown. For example... Figure 10 The different real-time temperature values ​​of the RF amplifier shown correspond to different real-time output levels of the optical module. Therefore, the third real-time output level of the optical module is closer to the preset output level than the second real-time output level of the optical module.

[0074] The first end of the optical module refers to the third end of the MCU, and the second end of the optical module refers to the second end of the voltage-controlled attenuator.

[0075] This application provides an optical module, including an optical receiving sub-module, an RF amplifier, a temperature sampling circuit, an MCU, and an attenuation circuit. The optical receiving sub-module converts received optical signals into electrical signals. The RF amplifier, located at the output of the optical receiving sub-module, amplifies the electrical signals. The temperature sampling circuit acquires the real-time temperature value of the RF amplifier. The MCU, with its first terminal connected to the temperature sampling circuit, includes a first register and a second register. The first register stores the real-time temperature value of the RF amplifier. The second register stores a gain compensation table. The gain compensation table is obtained based on a preset output level, a real-time output level, and the real-time temperature value of the RF amplifier. Both the preset output level and the real-time output level are the output levels of the optical module. The preset output level is the real-time output level of the optical module when the startup time reaches a preset time. The MCU reads the real-time temperature value of the RF amplifier during the startup process of the optical module and outputs a compensation voltage corresponding to the real-time temperature value of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table. The MCU obtains the compensation voltage corresponding to different temperatures of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table during the startup process of the optical module and outputs the compensation voltage. An attenuation circuit, located at the output of the RF amplifier, has its first terminal connected to the second terminal of the MCU. It is used to obtain the attenuation value corresponding to the compensation voltage. The attenuation circuit obtains different attenuation values ​​for the RF amplifier at different temperatures based on the compensation voltage corresponding to different temperatures of the RF amplifier. Since the attenuation circuit is located at the output of the RF amplifier, the output level of the optical module is the output level of the RF amplifier minus the attenuation value of the attenuation circuit. Furthermore, because the RF amplifier has different attenuation values ​​at different temperatures, the output level of the optical module is stable at different temperatures. In this application, the MCU has a first register and a second register. The first register stores the real-time temperature value of the RF amplifier, and the second register stores a gain compensation table. The MCU obtains different compensation voltages corresponding to different real-time temperatures of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table during the optical module startup process. The attenuation circuit obtains different attenuation values ​​corresponding to different compensation voltages, thus stabilizing the output level of the optical module at different temperatures.

[0076] Figure 11 This is a schematic diagram of the structure of a gain compensation table acquisition system according to some embodiments. Figure 11 As shown, in some embodiments, the system for obtaining the gain compensation table includes an optical module, a test host, and a spectrum analyzer. Specifically,

[0077] The optical module has two terminals: one connected to the first terminal of the test host, and the other connected to the first terminal of the spectrum analyzer. Specifically, the optical module includes an optical receiving sub-module, an RF amplifier, a temperature sampling circuit, an MCU, and an attenuation circuit. The RF amplifier is located at the output of the optical receiving sub-module, the temperature sampling circuit is located near the RF amplifier, the first terminal of the MCU is connected to the temperature sampling circuit, and the second terminal of the MCU is connected to the first terminal of the attenuation circuit.

[0078] The test host is connected to the third terminal of the MCU at the first terminal and to the second terminal of the spectrum analyzer at the second terminal.

[0079] During the testing process before the optical module leaves the factory, the test host is used to read the real-time temperature value of the RF amplifier in the first register of the MCU, and also to receive the real-time output level and preset output level uploaded by the spectrum analyzer. It is also used to obtain the gain compensation table based on the combination of the real-time temperature value, real-time output level and preset output level of the RF amplifier, and to write the gain compensation table into the second register of the MCU.

[0080] The spectrum analyzer has its first terminal connected to the first terminal of the attenuation circuit and its second terminal connected to the second terminal of the test host.

[0081] The spectrum analyzer can read the real-time output level and the preset output level.

[0082] In some embodiments, in addition to providing a schematic diagram of the gain compensation circuit of the optical module and a schematic diagram of the structure of the gain compensation table acquisition system, a gain compensation method is also provided. Figure 12 This is a flowchart of a gain compensation method according to some embodiments. Figure 12 It can be seen that the gain compensation method includes:

[0083] S100: The MCU reads the real-time temperature value of the RF amplifier.

[0084] During the startup process of the optical module, the MCU reads the real-time temperature value of the RF amplifier from the temperature sampling circuit and stores the real-time temperature value of the RF amplifier in the first register.

[0085] S200: The MCU determines whether the real-time temperature value of the RF amplifier is between the first temperature value and the second temperature value.

[0086] The MCU reads the real-time temperature value of the RF amplifier from the first register and determines whether the real-time temperature value of the RF amplifier is between the first temperature value and the second temperature value. The first temperature value is 15℃, and the second temperature value is 55℃.

[0087] S300: If the real-time temperature value of the RF amplifier is between the first temperature value and the second temperature value, the MCU reads the gain compensation table and outputs a compensation voltage according to the real-time temperature value of the RF amplifier and the gain compensation table.

[0088] The MCU reads the gain compensation table in the second register and outputs a compensation voltage according to the real-time temperature value of the RF amplifier and the gain compensation table.

[0089] If the real-time temperature value of the RF amplifier is not between the first temperature value and the second temperature value, then the MCU no longer reads the gain compensation table in the second register, but enables the automatic gain compensation function available in the original high and low temperature environment of the optical module.

[0090] The MCU obtains different compensation voltages corresponding to different real-time temperature values of the RF amplifier according to the real-time temperature value of the RF amplifier and the gain compensation table. The attenuation circuit obtains different attenuation values corresponding to different compensation voltages according to different compensation voltages, so that the output level of the optical module is stable at different temperatures.

[0091] In some embodiments, not only the schematic diagram of the gain compensation circuit of the optical module, the structural schematic diagram of the acquisition system of the gain compensation table, and the gain compensation method are provided, but also a method for obtaining the gain compensation table is provided. Figure 13 The flowchart of a method for obtaining a gain compensation table according to some embodiments is as follows. As Figure 13 It can be seen that the method for obtaining the gain compensation table includes:

[0092] T100: The test host reads the real-time temperature value, the preset output level, and the real-time output level of the RF amplifier.

[0093] Since the method for obtaining the gain compensation table is obtained before the optical module leaves the factory, the temperature at which the optical module is located before leaving the factory can fully meet 15°C < T < 55°C. The MCU does not need to judge the real-time temperature value of the RF amplifier, and the real-time temperature value of the RF amplifier obtained by the test host is in the range of 15°C < T < 55°C.

[0094] The real-time temperature value of the RF amplifier read by the test host is the real-time temperature value of the RF amplifier obtained by the MCU through the temperature sampling circuit and stored in the first memory during the test before the optical module leaves the factory.

[0095] T200: The test host obtains a first lookup table according to the real-time temperature value and the real-time output level of the RF amplifier.

[0096] T300: The test host obtains a second lookup table according to the first lookup table and the preset output level.

[0097] T400: The test host obtains a gain compensation table according to the second lookup table and the principle of the voltage-controlled attenuator.

[0098] Since the above embodiments are all described in conjunction with other methods, and different embodiments have the same parts, the same or similar parts between the various embodiments in this specification can be referred to mutually. They will not be described in detail here.

[0099] It should be noted that in this specification, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a circuit structure, article, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a circuit structure, article, or device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the circuit structure, article, or device that includes said element.

[0100] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the content of the claims.

[0101] The embodiments described above do not constitute a limitation on the scope of protection of this application.

Claims

1. An optical module characterized by comprising: include: The optical receiving submodule is used to convert the received optical signal into an electrical signal; A radio frequency amplifier is disposed at the output end of the optical receiving sub-module to amplify the electrical signal and form an amplified electrical signal; A temperature sampling circuit is used to acquire the real-time temperature value of the radio frequency amplifier; The MCU, with its first terminal connected to the temperature sampling circuit, includes a first register and a second register; The first register is used to store the real-time temperature value of the radio frequency amplifier; The second register is used to store a gain compensation table, wherein the gain compensation table is obtained based on a preset output level, a real-time output level and the real-time temperature value of the RF amplifier, wherein the preset output level and the real-time output level are both output levels of the optical module, and the preset output level is the real-time output level of the optical module when the startup time of the optical module reaches a preset time. The MCU is used to read the real-time temperature value of the RF amplifier during the startup process of the optical module, and is also used to output a compensation voltage corresponding to the real-time temperature value of the RF amplifier based on the real-time temperature value of the RF amplifier and the gain compensation table. An attenuation circuit is located at the output of the RF amplifier. Its first end is connected to the second end of the MCU. It is used to obtain an attenuation value corresponding to the compensation voltage based on the compensation voltage.

2. The optical module according to claim 1, characterized by The MCU is also used to determine whether the real-time temperature value of the RF amplifier is between the first temperature value and the second temperature value.

3. The optical module according to claim 1, characterized by The first register stores only one real-time temperature value of the RF amplifier.

4. The optical module according to claim 3, characterized by A real-time temperature value of an RF amplifier corresponds to a compensation voltage.

5. The optical module according to claim 1, characterized in that, The temperature sampling circuit includes a first voltage divider resistor, a thermistor, and a second voltage divider resistor. The first voltage divider resistor has a first terminal connected to the power supply voltage and a second terminal connected to the first terminal of the thermistor. The thermistor has its second end connected to the first end of the MCU and the first end of the second voltage divider resistor, and is at a preset distance from the RF amplifier. The second voltage divider resistor has its second terminal grounded.

6. The optical module according to claim 5, characterized in that, The attenuation circuit includes an operational amplifier and a voltage-controlled attenuator; The operational amplifier has its first terminal connected to the second terminal of the MCU and its second terminal connected to the first terminal of the voltage-controlled attenuator, and is used to amplify the compensation voltage to obtain the amplified compensation voltage. The voltage-controlled attenuator is used to obtain the attenuation value corresponding to the amplified compensation voltage based on the amplified compensation voltage.

7. A system for obtaining a gain compensation table, characterized in that, include: The optical module as described in any one of claims 1-6; The test host is connected to the MCU at the first end, and is used to read the real-time temperature value of the RF amplifier and write the gain compensation table into the MCU. The spectrum analyzer has one end connected to the voltage-controlled attenuator to read the real-time output level and the preset output level, and the other end connected to the second end of the test host to send the real-time output level and the preset output level to the test host. The test host is also used to obtain a gain compensation table based on the real-time temperature value of the RF amplifier, the preset output level, the real-time output level, and the principle of voltage-controlled attenuator.

8. The acquisition system according to claim 7, characterized in that, The test host is also used to obtain a gain compensation table based on the real-time temperature value of the RF amplifier, the preset output level, the real-time output level, and the voltage-controlled attenuator principle, including: The test host obtains a first lookup table based on the real-time temperature value and real-time output level of the RF amplifier; The test host obtains a second lookup table based on the first lookup table and the preset output level; The test host obtains the gain compensation table based on the second lookup table and the principle of voltage-controlled attenuator.

9. The acquisition system according to claim 8, characterized in that, The first lookup table is a table showing the relationship between the real-time temperature value and the real-time output level of the RF amplifier, and the second lookup table is a table showing the relationship between the real-time temperature value and the output level difference of the RF amplifier, wherein the output level difference is the difference between the preset output level and the real-time output level.

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