Optical module integrating OLT (optical line terminal) and ONU (optical network unit) equipment system functions

Abstract

The invention relates to the technical field of signal transmission, in particular to an optical module integrating OLT (optical line terminal) and ONU (optical network unit) equipment system functions. The device comprises a monitoring derivation unit, an electromagnetic interference unit and an isolation shielding unit. According to the shielding effect module, when the temperature is known, the dielectric constant is the polarization capability of the material under the action of an electric field and changes along with the change of the temperature, if the temperature rises, the molecular thermal motion of the material is aggravated, so that the temperature affects the dielectric constant and the signal transmission characteristic of the material, and a signal layer in the optical module is adjusted in a high-temperature environment; by adjusting the signal layer, electromagnetic interference can be remarkably reduced, signal integrity can be improved, then the shielding effect of the electric field is evaluated, the shielding material, structure or layout can be adjusted according to the evaluation result, the shielding effect is further improved, meanwhile, it is ensured that the distance between the high-frequency signal layer and the reference plane is minimized, and inductance of a signal loop is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of signal transmission, and more specifically, to an optical module integrating the functions of OLT and ONU devices. Background Art

[0002] With the rapid development of optical communication technology, integrating the core functions of OLT (Optical Line Terminal) and ONU (Optical Network Unit) into an optical module has become an important trend to simplify the network architecture and reduce deployment costs. However, the signal interference problem caused by function integration, especially the electromagnetic interference caused by the complex signal transmission path inside the module, has become a key challenge in technical implementation. In an optical module integrating the functions of OLT and ONU devices, the signal transmission path is complex, covering the electro-optical signal conversion and the cross-module transmission of electrical signals. When the optical module generates electromagnetic radiation during high-frequency signal transmission, the electromagnetic radiation will interfere with the adjacent circuits, causing electromagnetic interference in the optical module. Therefore, we provide an optical module integrating the functions of OLT and ONU device systems. Summary of the Invention

[0003] The purpose of the present invention is to provide an optical module integrating the functions of OLT and ONU device systems to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides an optical module integrating the functions of OLT and ONU device systems, including a monitoring and derivation unit, an electromagnetic interference unit, and an isolation and shielding unit; The optical module that integrates the functions of OLT and ONU devices in real-time monitors the internal signal transmission channel under high-temperature conditions and extracts historical data in real-time. When the optical module transmits high-frequency signals through the internal signal transmission channel, the current value changing with time is calculated. According to Maxwell's electromagnetic theory, it is known that the intensity of electromagnetic radiation is proportional to the current change rate, so an approximate formula for the current change rate is obtained. Then, according to Maxwell's electromagnetic theory, the intensity of electromagnetic radiation is derived based on the approximate formula for the current change rate; It is used to receive the command that forms electromagnetic radiation, and obtains historical data from it to implement a function with temperature as the independent variable. According to the intensity of electromagnetic radiation, the distance between the radiation source and the adjacent circuit, and the function with temperature as the independent variable, the noise voltage in the high-temperature environment is calculated to determine whether there is an electromagnetic interference problem in the optical module under high-temperature conditions; It is used to receive the command that there is an electromagnetic interference problem in the optical module under high-temperature conditions from it, and the historical data from it. Since high-frequency signals generate electromagnetic radiation, a separation distance needs to be maintained between the high-frequency signal layer and the low-frequency signal layer. The separation distance at the calculated temperature is calculated according to the frequency of the transmitted high-frequency signal, and the signal layer in the optical module is adjusted under high-temperature conditions to form a shielding effect, and then the shielding effect is evaluated for the electric field.

[0005] As a further improvement of this technical solution, the monitoring and derivation unit includes a monitoring and transmission module and a calculation and derivation module; The optical module that monitors and integrates the functions of OLT and ONU devices monitors the internal signal transmission channel under high-temperature conditions, and extracts in real time the signal frequency being transmitted, the amplitude of the transmitted high-frequency signal, the rise time of the transmitted high-frequency signal frequency, and the current time, as well as historical data; The transmitted signal frequency is divided into the transmitted high-frequency signal frequency and the transmitted low-frequency signal frequency; When the optical module transmits high-frequency signals through the internal signal transmission channel, a current will be formed and affect the equivalent resistance of the transmission channel; if the resistance decreases, with the input voltage unchanged, the current will increase, and then record the amplitude of the current , at this time the current will change rapidly with time, then calculate the current value changing with time. According to Maxwell's electromagnetic theory, a changing current will generate a changing magnetic field, and a changing magnetic field will generate a changing electric field. This alternating electromagnetic field will radiate into the surrounding space in the form of electromagnetic waves, thus forming electromagnetic radiation, and extract the radiation power of the radiation source.

[0006] As a further improvement of this technical solution, it is used to receive the radiation power of the medium radiation source, the current value changing with time, the rise time of the transmitted high-frequency signal frequency, the amplitude of the current, and the current time. Calculate the distance between the radiation source in the optical module and the adjacent circuit according to the radiation power of the radiation source, and then derive the current change rate with respect to the current time according to the known current value changing with time. According to Maxwell's electromagnetic theory, it is known that the intensity of electromagnetic radiation is proportional to the current change rate, then obtain the approximate formula of the current change rate, and then derive the intensity of electromagnetic radiation according to the approximate formula of the current change rate through Maxwell's electromagnetic theory.

[0007] As a further improvement of this technical solution, it is used to receive the command to form electromagnetic radiation in the medium, obtain historical data from the medium, extract the temperature correction function and the coupling coefficient at room temperature from the historical data to implement a function with temperature as the independent variable. However, in the electromagnetic environment, a changing electric field will be generated accordingly. This changing electric field will induce charges on the conductors of the adjacent circuit in the optical module, thus forming a noise voltage; Then obtain the intensity of electromagnetic radiation, the distance between the radiation source and the adjacent circuit, and the function with temperature as the independent variable from the medium to combine and calculate the noise voltage in the high-temperature environment, and then set a standard noise voltage threshold to determine whether there is an electromagnetic interference problem with the optical module in the high-temperature environment. When the noise voltage in the high-temperature environment is greater than the set standard noise voltage threshold, it is determined that there is an electromagnetic interference problem with the optical module in the high-temperature environment.

[0008] As a further improvement of this technical solution, it includes and; Receive the command regarding the electromagnetic interference problem of the optical module in the medium and high temperature environment. In the high temperature environment, the material properties of the optical module will change. Use professional electromagnetic simulation software to simulate the material properties in the optical module, obtain the dielectric constant at the temperature, and record the dielectric constant at room temperature; Obtain the transmitted signal frequency, extract the transmitted high-frequency signal frequency from the transmitted signal frequency. Since high-frequency signals will generate electromagnetic radiation, an isolation distance needs to be maintained between the high-frequency signal layer and the low-frequency signal layer. Calculate the isolation distance at the temperature based on the transmitted high-frequency signal frequency and the dielectric constant at the temperature.

[0009] As a further improvement of this technical solution, receive the historical data and the dielectric constant at room temperature in the medium. When the temperature is known, since the dielectric constant changes with temperature, if the temperature rises, the molecular thermal motion of the materials in the optical module intensifies. Therefore, temperature will affect the dielectric constant and signal transmission characteristics of the materials, and adjust the signal layer in the high temperature environment to form a shielding effect, and then evaluate the shielding effect on the electric field.

[0010] As a further improvement of this technical solution, the implementation process of adjusting the division standard of the signal layer in the medium and high temperature environment: First, extract the temperature coefficient from the historical data , and then according to the temperature coefficient and room temperature analyze the change of the dielectric constant with temperature ; Secondly, when the temperature continuously rises and reaches the set high temperature environment, due to the change of the dielectric constant caused by the continuous change of temperature, the isolation distance needs to be recalculated. Therefore, substitute the dielectric constant at room temperature into the isolation distance algorithm formula to obtain the isolation distance at the temperature ; Finally, in the high temperature environment, select materials with good high temperature stability as the signal layer and the reference plane. The dielectric constant of the high temperature materials changes less at high temperature and is suitable for high-frequency signal transmission. Then, allocate the transmitted high-frequency signals to a separate signal layer and make it as close as possible to the reference plane. The transmitted low-frequency signals can share the signal layer and have lower requirements for the reference plane. Insert a reference plane between the signal layers and record the distance between the signal layer and the reference plane to form a shielding effect.

[0011] As a further improvement of this technical solution, insert a reference plane between the signal layers to form the implementation principle of the shielding effect: Since the reference plane absorbs or reflects the electric field, preventing the electric field from propagating between signal layers, according to Gauss's law, the electric field lines will terminate at the conductor surface. Therefore, the reference plane shields the electric field. First, collect the initial electric field strength from historical data. , through the initial electric field strength and the distance between the signal layer and the reference plane calculate the attenuation law of the electric field strength during propagation in the optical module, and then evaluate the shielding effect on the electric field.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: In the optical module integrating the functions of OLT and ONU devices, the shielding effect module receives the historical data in the monitoring and derivation unit and the dielectric constant at room temperature in the isolation distance module. When the temperature is known, since the dielectric constant is the ability of the material to polarize under the action of the electric field and it changes with temperature. If the temperature increases, the molecular thermal motion of the material intensifies. Therefore, temperature affects the dielectric constant of the material and the signal transmission characteristics. And adjust the signal layer in the optical module in a high-temperature environment to form a shielding effect. By adjusting the signal layer, electromagnetic interference can be significantly reduced, signal integrity can be improved, and then evaluate the shielding effect on the electric field. According to the evaluation results, the shielding material, structure or layout can be adjusted to further improve the shielding effect, and at the same time ensure that the distance between the high-frequency signal layer and the reference plane is minimized to reduce the inductance of the signal loop. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the unit block diagram of the present invention; Figure 2 is the module unit block diagram of the present invention.

[0014] The meanings of the reference numerals in the drawings are as follows: 10. Monitoring and derivation unit; 101. Monitoring and transmission module; 102. Calculation and derivation module; 20. Electromagnetic interference unit; 30. Isolation and shielding unit; 301. Isolation distance module; 302. Shielding effect module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] Embodiment 1

[0017] The present invention provides an optical module integrating the functions of OLT and ONU devices. Please refer to Figure 1 - Figure 2 , which includes a monitoring and derivation unit 10, an electromagnetic interference unit 20, and an isolation and shielding unit 30; The monitoring and derivation unit 10 monitors in real time the internal signal transmission channel of the optical module integrating the functions of OLT and ONU devices under high-temperature conditions, and extracts historical data in real time. When the optical module transmits high-frequency signals through the internal signal transmission channel, the current value changing with time is calculated. According to Maxwell's electromagnetic theory, it is known that the intensity of electromagnetic radiation is proportional to the current change rate, so an approximate formula for the current change rate is obtained. Then, according to Maxwell's electromagnetic theory and the approximate formula for the current change rate, the intensity of electromagnetic radiation is derived; the electromagnetic interference unit 20 is used to receive the command for forming electromagnetic radiation in the monitoring and derivation unit 10. The electromagnetic interference unit 20 obtains historical data from the monitoring and derivation unit 10 to implement a function with temperature as the independent variable. According to the intensity of electromagnetic radiation, the distance between the radiation source and the adjacent circuit, and the function with temperature as the independent variable, the noise voltage under high-temperature conditions is calculated by combining them, and it is judged whether there is an electromagnetic interference problem with the optical module under high-temperature conditions; the isolation and shielding unit 30 is used to receive the command that there is an electromagnetic interference problem with the optical module under high-temperature conditions in the electromagnetic interference unit 20. The isolation and shielding unit 30 obtains historical data from the monitoring and derivation unit 10. Since high-frequency signals generate electromagnetic radiation, an isolation distance needs to be maintained between the high-frequency signal layer and the low-frequency signal layer. The isolation distance at the calculated temperature is calculated according to the frequency of the transmitted high-frequency signal, and the signal layer in the optical module is adjusted under high-temperature conditions to form a shielding effect, and then the shielding effect is evaluated for the electric field.

[0018] The monitoring and derivation unit 10 includes a monitoring and transmission module 101 and a calculation and derivation module 102; First, the monitoring and transmission module 101 monitors in real time the internal signal transmission channel of the optical module integrating the functions of OLT and ONU devices under high-temperature conditions (since the operating temperature range of industrial-grade optical modules is usually -40°C to 85°C, and when it exceeds 85°C, it is a high-temperature condition), and extracts in real time the transmitted signal frequency, the rising time of the transmitted high-frequency signal frequency (referring to the time required for the signal to rise from a low level to a high level; the shorter the rising time, the steeper the change of the signal, which means that the signal contains richer high-frequency components) and the current time , as well as historical data; The historical data includes a temperature correction function (which is a function with temperature T as the independent variable, and the role of α(T) is to correct a certain physical quantity (such as resistance, coefficient of thermal expansion, etc.) according to the change of temperature T), the coupling coefficient at normal temperature (The K value at room temperature, which generally does not exceed the set high temperature value and serves as a reference value, is the value measured under room temperature conditions), temperature coefficient (The rate of change of the dielectric constant with temperature), initial electric field strength , Divide the frequency of the transmitted signal into the high-frequency signal frequency for transmission (For transmitting high-speed signals (such as clock signals, data signals)) and the low-frequency signal frequency for transmission (For transmitting low-speed signals (such as control signals)). The high-frequency signal frequency for transmission is greater than 50 megahertz / MHz (such as clock signals, high-speed data signals), and the low-frequency signal frequency for transmission is less than or equal to 50 megahertz / MHz (such as control signals, power supply signals); When the optical module transmits high-frequency signals through the internal signal transmission channel, the internal signal transmission channel processes the high-frequency signals. The electrons in the internal signal transmission channel move rapidly with the change of the high-frequency signals, thus forming an electric current. Due to the change of the performance of the internal components of the optical module in a high-temperature environment, the resistance of some semiconductor components will increase or decrease with the increase of temperature, which will affect the equivalent resistance of the transmission channel; if the resistance decreases, with the input voltage unchanged, the current will increase, causing the current to reach the maximum value during the fluctuation process, and then record the amplitude of the current (It reflects the intensity of the transmitted high-frequency signals. In the optical module, this amplitude value will affect the intensity of the optical signals. For example, in the laser driver circuit, the amplitude of the current is larger, the peak value of the current injected into the laser is larger, and the optical power emitted by the laser is often stronger, so that optical signals with a longer distance or a higher rate can be transmitted), at this time the current will change rapidly with time, and then calculate the current value changing with time. According to Maxwell's electromagnetic theory, a changing current will generate a changing magnetic field, and a changing magnetic field will generate a changing electric field. This alternating electromagnetic field will radiate into the surrounding space in the form of electromagnetic waves, thus forming electromagnetic radiation, and extract the radiation power of the radiation source ; The implementation principle of calculating the current value changing with time: By collecting the high-frequency signal frequency for transmission , the amplitude of the current (Due to the decrease in resistance, with the input voltage unchanged, the current will increase, causing the current to reach the maximum value during the fluctuation process. The amplitude of the current refers to the peak value of the current) and the current time to calculate the current value changing with time , the specific algorithm formula: ; Among them, the unit of the transmitted high-frequency signal frequency is usually Hertz (Hz), and the unit of time is second / s. The subscript "0" of is used to distinguish different currents or represent the current under a specific state; For example, the main function of an optical module is to achieve the mutual conversion of optical signals and electrical signals to complete high-speed data transmission. At the transmitting end, the laser driver circuit is responsible for converting electrical signals into optical signals. To meet the requirements of high-speed data transmission, such as transmission rates of 10 Gbps, 25 Gbps, or even higher, in the laser driver circuit, to achieve high-speed data modulation, the current needs to complete the conversion from low level to high level or from high level to low level within a very short time. This rapid current jump will generate rich high-frequency harmonic components, thereby radiating strong electromagnetic waves; The calculation and derivation module 102 is used to receive the radiation power of the radiation source in the monitoring and transmission module 101 , the current value varying with time , the rise time of the transmitted high-frequency signal frequency , the amplitude of the current and the current time . According to the radiation power of the radiation source , calculate the distance between the radiation source and the adjacent circuit in the optical module . Then, based on the known current value varying with time , derive the current change rate with respect to the current time . According to Maxwell's electromagnetic theory, it is known that the intensity of electromagnetic radiation is proportional to the current change rate . Then, obtain the approximate formula for the current change rate . Then, through Maxwell's electromagnetic theory, based on the approximate formula for the current change rate , derive the intensity of electromagnetic radiation . Obtain the expression for the intensity of electromagnetic radiation as , where represents being proportional; For example, Maxwell's "A Treatise on Electricity and Magnetism". Maxwell proposed the electromagnetic wave theory in his classic work, describing how changing electric and magnetic fields interact with each other to generate electromagnetic waves. The radiation power of electromagnetic waves is related to the change rate of current. The book details the derivation of the mechanism of electromagnetic radiation, especially the radiation involving accelerating charges. The acceleration is related to the change rate of current, which in turn affects the radiation intensity; Implementation principle of calculating the distance between the radiation source and the adjacent circuit in the optical module: Measure the electric field strength of the radiation using a spectrum analyzer , and then use the radiation power of the known radiation source and the measured electric field strength of the radiation to calculate the distance between the radiation source and the adjacent circuit , specific algorithm formula: ; where, is the attenuation exponent (usually n = 1 or 2; when the electromagnetic radiation source can be approximately regarded as an electric dipole source and the receiving circuit is in the near-field (inductive field) region of the radiation source, n usually takes 1; when the electromagnetic radiation source can be approximately regarded as an electric dipole source and the receiving circuit is in the far-field (radiation field) region of the radiation source, n usually takes 2), 60 refers to a constant. Simply put, this 60 is a constant derived from the free-space wave impedance and the basic physical properties of electromagnetic field propagation. It reflects the internal relationship between the electric field, magnetic field, and power during the propagation of electromagnetic waves in free space, The subscript " " of has no specific physical meaning and is used for distinction. The unit of the electric field strength of the radiation is volts per meter (V / m), and the unit of the radiation power of the radiation source is watt (W); Since the electromagnetic interference unit 20 receives the command to form electromagnetic radiation in the monitoring transmission module 101, the electromagnetic interference unit 20 obtains historical data from the monitoring transmission module 101 and extracts the temperature correction function and the coupling coefficient at room temperature to implement the function with temperature as the independent variable. The specific expression is . However, in the electromagnetic environment, a changing electric field is generated. This changing electric field will induce charges on the conductors of the adjacent circuit in the optical module, thus forming a noise voltage. This is because according to the principle of electromagnetic induction, a changing electric field will generate a magnetic field, and when a conductor is in a changing magnetic field, an induced electromotive force will be generated inside it, which will lead to the movement and accumulation of charges, ultimately forming a noise voltage. Moreover, the magnitude of this noise voltage may be affected by the function with temperature as the independent variable obtained previously, because temperature will change physical properties such as the resistance of the conductor, and the coupling coefficient will also affect the degree of interaction between the electric field and the conductor, thereby affecting the formation and magnitude of the noise voltage; Then obtain the intensity of the electromagnetic radiation and the distance between the radiation source and the adjacent circuit from the calculation and derivation module 102 and the known function with temperature Calculate the noise voltage under high-temperature environment , where the noise voltage under high-temperature environment The subscript " " refers to the attenuation exponent (usually n = 1 or 2). Then set the standard noise voltage threshold , and use the noise voltage under high-temperature environment and the set standard noise voltage threshold to make a judgment on whether there is an electromagnetic interference problem in the optical module under high-temperature environment. When the noise voltage under high-temperature environment is greater than the set standard noise voltage threshold , it is determined that there is an electromagnetic interference problem in the optical module under high-temperature environment; The isolation and shielding unit 30 includes an isolation distance module 301 and a shielding effect module 302; First, the isolation distance module 301 is used to receive the command that there is an electromagnetic interference problem in the optical module under high-temperature environment in the electromagnetic interference unit 20. Since the material properties in the optical module change under high-temperature environment (such as the relative permittivity (an important electrical parameter of the material, indicating the multiple of the ability of the material to store electrical energy in an electric field relative to vacuum) changes), which affects the signal transmission characteristics, and professional electromagnetic simulation software (such as HFSS, CST, ADS) can be used to simulate the material properties in the optical module to obtain the relative permittivity at temperature , record the relative permittivity at room temperature , the isolation distance module 301 obtains the transmitted signal frequency from the monitoring and transmission module 101, and extracts the transmitted high-frequency signal frequency from the transmitted signal frequency. Since high-frequency signals are more likely to generate electromagnetic radiation and crosstalk, an isolation distance needs to be maintained between the high-frequency signal layer and the low-frequency signal layer. According to the transmitted high-frequency signal frequency and temperature and the relative permittivity at temperature , calculate the isolation distance at temperature ; The implementation principle of calculating the isolation distance: Collect the transmitted high-frequency signal frequency and the relative permittivity at temperature to calculate the isolation distance at temperature ; Among them, is the speed of light. This formula is used to calculate the isolation distance. By calculating the isolation distance, electromagnetic coupling can be reduced; The shielding effect module 302 receives the historical data in the monitoring and transmission module 101 and the dielectric constant at room temperature in the isolation distance module 301 ; When the temperature is known, since the dielectric constant is the ability of the material to polarize under the action of an electric field, it changes with the change of temperature . When the temperature rises, the molecular thermal motion of the material intensifies. Therefore, the temperature will affect the dielectric constant of the material and the signal transmission characteristics, and adjust the signal layer in the optical module in a high-temperature environment to form a shielding effect, and then evaluate the shielding effect on the electric field; Implementation process of adjusting the division standard of the signal layer in a high-temperature environment: First, extract the temperature coefficient from the historical data , and then analyze the change of the dielectric constant with temperature according to the temperature coefficient and the dielectric constant at room temperature . The formula is ; ; Secondly, when the temperature keeps rising and reaches the set high-temperature environment, due to the change of the dielectric constant caused by the continuous change of temperature , the isolation distance needs to be recalculated. Therefore, substitute the dielectric constant at room temperature into the isolation distance algorithm formula to obtain the isolation distance at temperature ; Finally, in a high-temperature environment, select materials with good high-temperature stability (such as high-temperature FR-4 or Rogers materials) as the signal layer and the reference plane. The dielectric constant of the high-temperature material changes less at high temperature and is suitable for high-frequency signal transmission. Then, allocate the transmitted high-frequency signals to a separate signal layer and make it as close as possible to the reference plane. The transmitted low-frequency signals can share the signal layer and have lower requirements for the reference plane. Insert a reference plane (ground plane or power plane) between the signal layers and record the distance between the signal layer and the reference plane ( in the subscript has no special meaning and is used for distinction), form a shielding effect, reduce electromagnetic interference, and at the same time ensure that the distance between the high-frequency signal layer and the reference plane is minimized to reduce the inductance of the signal loop; Principle of achieving shielding effect by inserting a reference plane between signal layers: Since a reference plane (such as a ground plane) can absorb or reflect an electric field and prevent the electric field from propagating between signal layers, according to Gauss's law, electric field lines will terminate at the conductor surface. Therefore, the reference plane can effectively shield the electric field. First, collect the initial electric field strength from historical data , through the initial electric field strength and the distance between the signal layer and the reference plane calculate the attenuation law of the electric field strength during propagation in the optical module (referring to the quantitative relationship that when the signal propagates, its electric field energy gradually weakens due to the shielding effect of the reference plane), and its expression formula: , where refers to the attenuation coefficient. When the attenuation coefficient is greater than the set threshold, the electric field strength attenuates faster. By reducing the distance between the signal layer and the reference plane , the electric field attenuation effect can be further increased, thereby improving the shielding effect, and then evaluate the shielding effect on the electric field; Principle of evaluating shielding effect: According to the initial electric field strength and the attenuation law of the electric field strength during propagation in the optical module evaluate the shielding effect to obtain the evaluated shielding effect , where the evaluated shielding effect is in decibels (dB); when the evaluated shielding effect is greater than the set shielding effect threshold, reducing the distance between the signal layer and the reference plane can significantly improve the shielding effect.

[0019] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An optical module integrating the functions of OLT and ONU devices, characterized in that: It includes a monitoring and derivation unit (10), an electromagnetic interference unit (20) and an isolation and shielding unit (30); The monitoring and derivation unit (10) monitors in real time the internal signal transmission channel of the optical module integrating the functions of the OLT and ONU devices under high-temperature conditions, and extracts historical data in real time. When the optical module transmits high-frequency signals through the internal signal transmission channel, it calculates the current value changing with time. According to Maxwell's electromagnetic theory, it is known that the intensity of electromagnetic radiation is proportional to the current change rate, so an approximate formula for the current change rate is obtained. Then, according to Maxwell's electromagnetic theory, the intensity of electromagnetic radiation is derived based on the approximate formula for the current change rate; The electromagnetic interference unit (20) is used to receive the command to form electromagnetic radiation in the monitoring and derivation unit (10). The electromagnetic interference unit (20) obtains historical data from the monitoring and derivation unit (10) to implement a function with temperature as the independent variable. Based on the intensity of electromagnetic radiation, the distance between the radiation source and the adjacent circuit, and the function with temperature as the independent variable, it combines and calculates the noise voltage in a high-temperature environment to determine whether there is an electromagnetic interference problem with the optical module in a high-temperature environment; The isolation and shielding unit (30) is used to receive the command that there is an electromagnetic interference problem with the optical module in a high-temperature environment in the electromagnetic interference unit (20). The isolation and shielding unit (30) obtains historical data from the monitoring and derivation unit (10). Since high-frequency signals generate electromagnetic radiation, an isolation distance needs to be maintained between the high-frequency signal layer and the low-frequency signal layer. The isolation distance at the calculated temperature is calculated according to the frequency of the transmitted high-frequency signal, and the signal layer in the optical module is adjusted in a high-temperature environment to form a shielding effect, and then the shielding effect is evaluated for the electric field.

2. The optical module integrating the functions of OLT and ONU devices according to claim 1, characterized in that: The monitoring and derivation unit (10) includes a monitoring and transmission module (101) and a calculation and derivation module (102); The monitoring and transmission module (101) monitors in real time the internal signal transmission channel of the optical module integrating the functions of the OLT and ONU devices under high-temperature conditions, and extracts in real time the transmitted signal frequency, the rise time of the transmitted high-frequency signal frequency, the current time, and historical data; The transmitted signal frequency is divided into the transmitted high-frequency signal frequency and the transmitted low-frequency signal frequency; When the optical module transmits high-frequency signals through the internal signal transmission channel, record the amplitude of the current , at this time the current will change rapidly with time, then calculate the current value that changes with time. According to Maxwell's electromagnetic theory, the changing current generates an alternating electromagnetic field through electromagnetic induction and radiates energy in the form of electromagnetic waves, and extract the radiation power of the radiation source.

3. The optical module integrating the functions of OLT and ONU devices according to claim 2, wherein: The calculation and derivation module (102) is used to receive the radiation power of the radiation source, the current value changing with time, the rise time of the transmitted high-frequency signal frequency, the amplitude of the current, and the current time in the monitoring and transmission module (101). It calculates the distance between the radiation source and the adjacent circuit in the optical module according to the radiation power of the radiation source, and then derives the current change rate with respect to the current time based on the known current value changing with time. According to Maxwell's electromagnetic theory, it is known that the intensity of electromagnetic radiation is proportional to the current change rate, so an approximate formula for the current change rate is obtained. Then, according to Maxwell's electromagnetic theory, the intensity of electromagnetic radiation is derived based on the approximate formula for the current change rate.

4. The optical module integrating the functions of OLT and ONU devices according to claim 2, characterized in that: The electromagnetic interference unit (20) is used to receive the command for forming electromagnetic radiation in the monitoring and transmission module (101). The electromagnetic interference unit (20) obtains historical data from the monitoring and transmission module (101), extracts the temperature correction function and the coupling coefficient at room temperature from the historical data to implement a function with temperature as the independent variable. However, in the electromagnetic environment, a changing electric field is generated accordingly, and this changing electric field will induce charges on the conductors of the adjacent circuits in the optical module, thus forming a noise voltage; Then, obtain the intensity of electromagnetic radiation, the distance between the radiation source and the adjacent circuit, and the function with temperature as the independent variable from the calculation and derivation module (102) to calculate the noise voltage in the high-temperature environment by combining them. Then, set the standard noise voltage threshold to determine whether there is an electromagnetic interference problem in the optical module in the high-temperature environment. When the noise voltage in the high-temperature environment is greater than the set standard noise voltage threshold, it is determined that there is an electromagnetic interference problem in the optical module in the high-temperature environment.

5. The optical module integrating the functions of OLT and ONU devices according to claim 4, characterized in that: The isolation and shielding unit (30) includes an isolation distance module (301) and a shielding effect module (302); The isolation distance module (301) is used to receive the command that there is an electromagnetic interference problem in the optical module in the high-temperature environment in the electromagnetic interference unit (20). The material properties of the optical module in the high-temperature environment will change, and professional electromagnetic simulation software is used to simulate the material properties of the optical module to obtain the dielectric constant at the temperature, and record the dielectric constant at room temperature; The isolation distance module (301) obtains the transmitted signal frequency from the monitoring and transmission module (101), extracts the transmitted high-frequency signal frequency from the transmitted signal frequency. Since high-frequency signals will generate electromagnetic radiation, an isolation distance needs to be maintained between the high-frequency signal layer and the low-frequency signal layer. Calculate the isolation distance at the temperature according to the transmitted high-frequency signal frequency and the dielectric constant at the temperature.

6. The optical module integrating the functions of OLT and ONU devices according to claim 5, characterized in that: The shielding effect module (302) is used to receive the historical data in the monitoring and transmission module (101) and the dielectric constant at room temperature in the isolation distance module (301). As the temperature rises, it affects signal transmission and adjusts the signal layer by changing the dielectric constant and molecular thermal motion characteristics of the optical module material to form a shielding effect, and then evaluates the shielding effect on the electric field.

7. The optical module integrating the functions of OLT and ONU devices according to claim 6, characterized in that: The implementation process of adjusting the signal layer division standard in the shielding effect module (302) in the high-temperature environment: First, extract the temperature coefficient from historical data , and then analyze the change of the dielectric constant with temperature according to the temperature coefficient and the dielectric constant at room temperature . Secondly, when the temperature continually rises and reaches the set high-temperature environment, due to the continuous change leading to the change of the dielectric constant, the isolation distance needs to be recalculated. Therefore, substituting the dielectric constant at normal temperature into the isolation distance algorithm formula to obtain the isolation distance at the temperature; Finally, in the high-temperature environment, select materials with good high-temperature stability as the signal layer and the reference plane. The dielectric constant of the high-temperature material changes less at high temperatures and is suitable for high-frequency signal transmission. Then, allocate the transmitted high-frequency signals to a separate signal layer and close to the reference plane. The transmitted low-frequency signals share the signal layer and have lower requirements for the reference plane. Insert a reference plane between the signal layers and record the distance between the signal layer and the reference plane to form a shielding effect.

8. The optical module integrating the functions of OLT and ONU devices according to claim 6, characterized in that: The implementation principle of forming the shielding effect: The reference plane absorbs or reflects the electric field, uses Gauss's law to terminate the electric field lines on the conductor surface, and shields the electric field. Then, combine the historical data with the distance between the signal layer and the reference plane to calculate the electric field propagation attenuation law of the optical module and evaluate the electric field shielding effect.

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