Optical communication system, optical communication terminal, and optical signal processing method

Abstract

The application discloses an optical communication system, an optical communication terminal and an optical signal processing method, and belongs to the optical communication field. The optical communication system provided by the application comprises an optical amplification module and a gain adjustment module. The communication end of the optical amplification module is connected with the input end of the gain adjustment module, and the output end of the gain adjustment module is connected with the input end of the optical amplification module. The gain adjustment module is used for determining a target intensity interval to which the intensity of a target optical signal belongs, and outputting a target gain control signal corresponding to the target intensity interval to the input end of the optical amplification module. The target optical signal is an optical signal from the communication end of the optical amplification module. Different intensity intervals correspond to different gain control signals.

Description

Technical Field

[0001] This application belongs to the field of optical communication, specifically relating to an optical communication system, an optical communication terminal, and an optical signal processing method. Background Technology

[0002] In optical communication systems, optical amplifier modules amplify received input optical signals to improve the signal detection capabilities of subsequent circuits. When the intensity of the input optical signal changes drastically, the optical amplification factor of the optical amplifier module needs to be adjusted accordingly to prevent strong optical signals from being amplified at a high factor, which could overload and saturate subsequent circuits, while ensuring that weak optical signals can be effectively amplified.

[0003] In order to dynamically adjust the optical amplification factor of the optical amplifier module, a feedback adjustment scheme exists in related technologies. This scheme gradually adjusts the optical amplification factor of the optical amplifier module by detecting the output signal strength of the subsequent circuit and performing calculations.

[0004] However, related technologies suffer from slow gain adjustment speed in optical amplification modules. Taking subsequent circuits, including power amplification modules, as an example, these technologies typically first detect the electrical signal strength at the output of the power amplification module. When the detected signal is too strong, causing the power amplification module to approach an overload saturation state, a feedback control signal is generated through calculation to successively adjust the optical amplification factor of the optical amplification module until the electrical signal strength at the output of the power amplification module is lower than its overload threshold. This method involves intermediate steps such as detecting the output of subsequent circuits, calculation, and multiple adjustments, which introduces a considerable time delay, resulting in slow gain adjustment speed. Summary of the Invention

[0005] This application provides an optical communication system, an optical communication terminal, and an optical signal processing method to solve the problem of slow gain adjustment speed of optical amplification modules in related technologies.

[0006] In a first aspect, embodiments of this application provide an optical communication system, including: An optical amplification module and a gain adjustment module; the communication terminal of the optical amplification module is connected to the input terminal of the gain adjustment module, and the output terminal of the gain adjustment module is connected to the input terminal of the optical amplification module; The gain adjustment module is used to determine the target intensity range to which the intensity of the target optical signal belongs, and outputs a target gain control signal corresponding to the target intensity range to the input of the optical amplification module. The target optical signal is an optical signal from the communication end of the optical amplification module. Different intensity ranges correspond to different gain control signals.

[0007] Secondly, embodiments of this application provide an optical communication system, including the optical communication terminal as described in the first aspect.

[0008] Thirdly, embodiments of this application provide an optical signal processing method, including: The target optical signal is acquired from the communication end of the optical amplification module; Determine the target intensity range to which the intensity of the target optical signal belongs; The gain adjustment module outputs a target gain control signal corresponding to the target intensity range to the input of the optical amplification module; Different intensity ranges correspond to different gain control signals.

[0009] In this embodiment, the optical communication system includes an optical amplification module and a gain adjustment module. The communication terminal of the optical amplification module is connected to the input terminal of the gain adjustment module, and the output terminal of the gain adjustment module is connected to the input terminal of the optical amplification module. The gain adjustment module is used to determine the target intensity range to which the intensity of the target optical signal belongs, and outputs a target gain control signal corresponding to the target intensity range to the input terminal of the optical amplification module. The target optical signal is an optical signal from the communication terminal of the optical amplification module. Different intensity ranges correspond to different gain control signals. In this way, the gain adjustment module switches the gain control signal input to the optical amplification module to the target gain control signal corresponding to the target intensity range according to the target intensity range to which the intensity of the target optical signal belongs, so as to quickly change the optical amplification factor of the optical amplification module. This eliminates the need for intermediate steps such as detecting the output of subsequent circuits, complex calculation processing, and gradual adjustment, thereby improving the gain adjustment speed and enabling the optical amplification module to quickly respond to changes in the intensity of the input optical signal. Attached Figure Description

[0010] Figure 1 Schematic diagram of an optical communication system provided in some embodiments of this application; Figure 2 Schematic diagram of an optical communication system provided in some embodiments of this application; Figure 3 Schematic diagram of an optical communication system provided in some embodiments of this application; Figure 4 Schematic diagram of an optical communication system provided in some embodiments of this application; Figure 5 Schematic diagram of an optical communication system provided in some embodiments of this application; Figure 6 Schematic diagram of an optical communication system provided in some embodiments of this application; Figure 7 Schematic diagram of an optical communication system provided in some embodiments of this application; Figure 8 Schematic diagram of an optical communication system provided in some embodiments of this application; Figure 9A schematic diagram of a switching module provided in some embodiments of this application; Figure 10 A schematic diagram illustrating the operating range of a transimpedance amplifier (TIA) provided in some embodiments of this application; Figure 11 A timing diagram illustrating the normal operation of an optical communication system provided in some embodiments of this application; Figure 12 A schematic diagram of an optical communication terminal provided in some embodiments of this application; Figure 13 This is a schematic flowchart illustrating an optical signal processing method provided in some embodiments of this application.

[0011] Explanation of reference numerals in the attached figures: 10-Optical communication system; 100-Optical amplification module; 110-Semiconductor optical amplifier; 200-Gain adjustment module; 210-Switching switch module; 211-First comparator; 212-Second comparator; 213-Decision unit; 220-Multi-level drive current source; I1-First constant current source; I2-Second constant current source; 230-Optical detection module; 231-Photodetector; 232-Sampling resistor; 300-Photoelectric conversion module; PD-Photodiode; 400-Target module; TIA-Transimpedance amplifier; 1200-Optical communication terminal. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0013] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0014] The optical communication system, optical communication terminal, and optical signal processing method provided in the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0015] In some embodiments of this application, such as Figure 1 or Figure 2 As shown, this application provides an optical communication system 10, including: an optical amplification module 100 and a gain adjustment module 200; the communication terminal of the optical amplification module 100 is connected to the input terminal of the gain adjustment module 200, and the output terminal of the gain adjustment module 200 is connected to the input terminal of the optical amplification module 100; The gain adjustment module 200 is used to determine the target intensity range to which the intensity of the target optical signal belongs, and outputs a target gain control signal corresponding to the target intensity range to the input terminal of the optical amplification module 100. The target optical signal is an optical signal from the communication terminal of the optical amplification module 100. Different intensity ranges correspond to different gain control signals.

[0016] In this embodiment, the optical amplification module 100 is used to amplify the input optical signal in the optical domain. The optical amplification module 100 can be a semiconductor optical amplifier (SOA). An SOA is a current-driven device, and its optical amplification factor is positively correlated with the current value of the driving current signal; that is, the larger the driving current, the higher the optical amplification factor; and the smaller the driving current, the lower the optical amplification factor. The SOA has three optical signal ports: a main optical input port, a main optical output port, and a monitoring optical acquisition port. The main optical input port is used to receive the input optical signal from the front-end circuit, the main optical output port is used to output the amplified optical signal to the subsequent circuit, and the monitoring optical acquisition port is used to acquire a portion of the optical signal to the gain adjustment module 200.

[0017] In this embodiment, the gain adjustment module 200 outputs a corresponding gain control signal to the optical amplification module 100 based on the intensity range to which the target optical signal belongs. The gain control signal includes, but is not limited to, drive current signals, voltage signals, or other forms of control signals; this application does not impose any limitations on these. When the gain control signal is a drive current signal, the optical amplification factor of the optical amplification module 100 can be changed by altering the magnitude of the drive current.

[0018] In this way, the gain adjustment module 200 switches the gain control signal input to the optical amplification module to the target gain control signal corresponding to the target intensity range according to the target intensity range of the target optical signal intensity, so as to quickly change the optical amplification factor of the optical amplification module 100. This eliminates the need for intermediate steps such as detecting the output of subsequent circuits, complex calculations, and gradual adjustments, thereby improving the gain adjustment speed and enabling the optical amplification module 100 to quickly respond to changes in the intensity of the input optical signal.

[0019] In some embodiments of this application, the communication terminal of the optical amplification module 100 can be either the optical input terminal or the optical output terminal of the optical amplification module 100.

[0020] For example, refer to Figure 1 The communication terminal of the optical amplification module 100 can be its optical output terminal, which is connected to the input terminal of the gain adjustment module 200. The target optical signal acquired by the input terminal of the gain adjustment module 200 is the output optical signal of the optical amplification module 100. In this way, the gain adjustment module 200 can adjust the amplification factor of the optical amplification module 100 in reverse according to the intensity of the amplified output optical signal, forming a closed-loop feedback control. Regardless of whether the input optical signal intensity is too high or too low, the gain control signal output by the gain adjustment module 200 can ensure stable amplification of the input optical signal while avoiding the problem of overloading subsequent modules due to an excessively high output optical signal.

[0021] For example, refer to Figure 2 The communication terminal of the optical amplification module 100 can be its optical input terminal, which is connected to the input terminal of the gain adjustment module 200. The target optical signal acquired by the input terminal of the gain adjustment module 200 is the output optical signal of the optical amplification module 100. In this way, the gain adjustment module 200 can pre-adjust the amplification factor of the optical amplification module 100 according to the intensity of the input optical signal, forming feedforward control. When the intensity of the input optical signal is high, the gain adjustment module 200 outputs a gain control signal to reduce the amplification factor in advance, avoiding excessive amplification of the strong optical signal and causing overload of subsequent modules; when the intensity of the input optical signal is low, the gain adjustment module 200 outputs a gain control signal to increase the amplification factor, ensuring stable amplification of the weak optical signal.

[0022] In this way, by connecting one of the optical input terminal and the optical output terminal of the optical amplification module 100 to the input terminal of the gain adjustment module 200, this embodiment of the application can realize both feedback control based on the output optical signal and feedforward control based on the input optical signal, thereby improving the flexibility and applicability of the system. It also enables gain adjustment to be completed before the optical signal enters the subsequent circuit, thus avoiding the subsequent circuit from entering an overload state due to excessively strong signals.

[0023] In some embodiments of this application, in order to convert optical signals into electrical signals and amplify and output them, reference is made to... Figure 3 or Figure 4 The optical communication system 10 may further include a photoelectric conversion module 300 and a target module 400. The output terminal of the optical amplification module 100 is connected to the input terminal of the photoelectric conversion module 300, and the output terminal of the photoelectric conversion module 300 is connected to the input terminal of the target module 400.

[0024] In this embodiment, the photoelectric conversion module 300 may include, but is not limited to, photoelectric devices such as photodiodes (PDs) and avalanche photodiodes (APDs), and this application does not impose any limitations on this. The photoelectric conversion module 300 is used to convert the optical signal output by the optical amplification module 100 into a photocurrent signal.

[0025] In this embodiment, the target module 400 may include, but is not limited to, electrical amplification devices such as a trans-impedance amplifier (TIA) and a limiting amplifier; this application does not impose any limitations on this. The target module 400 amplifies the photocurrent signal output by the photoelectric conversion module 300 into a voltage signal output. The target module 400 has an overload threshold, which is the voltage at which the target module 400 switches between a non-overload state and an overload state. When the operating voltage of the target module 400 is less than the overload threshold, the target module 400 operates in the linear amplification region and is in a non-overload state; when the operating voltage of the target module 400 is greater than the overload threshold, the target module 400 operates in the overload region and is in an overload state, resulting in output signal distortion.

[0026] Thus, in this embodiment, the optical signal is converted into an electrical signal by the photoelectric conversion module 300, and then the electrical signal is amplified and output by the target module 400, realizing a complete conversion link from optical signal to usable electrical signal. At the same time, the gain of the optical amplification module 100 is quickly adjusted by the gain adjustment module 200, so that the photocurrent input to the target module 400 is always lower than its overload threshold, thereby preventing the target module 400 from entering an overload state.

[0027] In some embodiments of this application, in order to achieve rapid switching of the drive current, the gain control signal includes the drive current; Reference Figure 5 or Figure 6 In the optical communication system 10, the gain adjustment module 200 includes: a switching module 210 and a drive current source 220 that provides at least two levels of drive current, with the levels of drive current corresponding to the intensity ranges. The switching module 210 has a first input terminal, multiple second input terminals, and an output terminal. The first input terminal of the switching module 210 is used to acquire a target electrical signal, which is obtained based on a target optical signal. The multiple second input terminals of the switching module 210 are respectively connected to the multiple output terminals of the driving current source 220, and the output terminal of the switching module 210 is connected to the input terminal of the optical amplification module 100. The switching module 210 is used to: based on the target intensity range, conduct the target second input terminal corresponding to the target level from among a plurality of second input terminals, so that the output terminal of the switching module 210 outputs the drive current of the target level to the input terminal of the optical amplifier module 100, wherein the target level is the level corresponding to the target intensity range among at least two levels.

[0028] In this embodiment, the switching module 210 can be a purely hardware-based analog comparison switch circuit with a preset voltage threshold. The switching module 210 can compare the voltage value input to its first input terminal with the preset voltage threshold in real time, and select which of multiple second input terminals to conduct based on the comparison result. The switching time of the switching module 210 is less than 1 nanosecond, which can meet the rapid response requirements of bursty optical communication systems.

[0029] In this embodiment, the drive current source 220 includes at least two constant current sources, each providing a different level of drive current. The different levels of drive current correspond to different amplification factors of the optical amplification module 100. Multiple output terminals of the drive current source 220 are connected one-to-one with multiple second input terminals of the switching module 210.

[0030] In this way, the present application embodiment achieves nanosecond-level switching of the drive current by quickly selecting the corresponding drive current level based on the target electrical signal through the switching module 210, avoiding the delay caused by gradual adjustment through digital calculation in the traditional solution, thereby improving the gain adjustment speed.

[0031] In some embodiments of this application, in order to convert the target optical signal into a target electrical signal for the switching module 210 to determine, reference is made. Figure 5 or Figure 6 The gain adjustment module 200 also includes: a light detection module 230; the communication terminal of the light amplification module 100 is connected to the first input terminal of the switching module 210 through the light detection module 230; The optical detection module 230 is used to: convert the target optical signal into a target electrical signal, and output the target electrical signal to the first input terminal of the switching module 210; The intensity of the target electrical signal is used to reflect the intensity of the target optical signal.

[0032] In the embodiments of this application, the strength of the target electrical signal includes, but is not limited to, current strength or voltage strength, and this application does not impose any restrictions on it. For example, when the target electrical signal is a voltage signal, its voltage value directly reflects the strength of the target optical signal, which is convenient for the switching module 210 to compare and judge.

[0033] In this embodiment, the light detection module 230 converts the target light signal into a target electrical signal, enabling the switching module 210 to quickly sense the intensity of the target light signal in the form of an electrical signal, thereby performing rapid comparison and switching.

[0034] For example, in some embodiments of this application, taking the strength of the target electrical signal as voltage strength as an example, in order to convert the photocurrent signal into a voltage signal, refer to Figure 7 or Figure 8 The optical detection module 230 may include a photodetector 231 and a sampling resistor 232. The input terminal of the photodetector 231 is connected to the communication terminal of the optical amplification module 100, the output terminal of the photodetector 231 is grounded through the sampling resistor 232, and the output terminal of the photodetector 231 is also connected to the first input terminal of the switching module 210. Photodetector 231 is used to convert the target optical signal into a photocurrent signal; The sampling resistor 232 is used to generate the target electrical signal based on the photocurrent signal; The voltage value of the target electrical signal is used to reflect the strength of the target electrical signal. The voltage value of the target electrical signal is determined by the product of the current value of the photogenerated current signal and the resistance value of the sampling resistor 232.

[0035] In the embodiments of this application, the photodetector 231 may be, but is not limited to, optoelectronic devices such as photodiodes (PDs) and avalanche photodiodes (APDs). The photodetector 231 converts the received target light signal into a photocurrent signal, and the current value of the photocurrent signal is proportional to the intensity of the target light signal.

[0036] In this embodiment, one end of the sampling resistor 232 is connected to the output terminal of the photodetector 231, and the other end is grounded. When the photogenerated current signal flows through the sampling resistor 232, according to Ohm's law V=I×R, a voltage drop is generated across the sampling resistor 232, which is the voltage value of the target electrical signal. The voltage value of the target electrical signal is obtained by multiplying the current value of the photogenerated current signal and the resistance value of the sampling resistor 232, thus accurately reflecting the intensity of the target optical signal.

[0037] Thus, in this embodiment of the application, the intensity of the target light signal is converted into a voltage signal that is easy to compare through the cooperation of the photodetector 231 and the sampling resistor 232, so that the switching module 210 can make a comparison and judgment.

[0038] In practical applications, the number of drive current levels can be two, three, or even four, etc. This application does not impose a specific limitation on the number of drive current levels. The following examples illustrate this with two or three drive current levels.

[0039] In some embodiments of this application, in order to simplify system design and meet basic dynamic range requirements, there are two levels of drive current; in the two levels of drive current, the first level of drive current is greater than the second level of drive current; the intensity range may include a first intensity range and a second intensity range; the first intensity range corresponds to the first level of drive current, and the second intensity range corresponds to the second level of drive current.

[0040] Therefore, the switching module 210 can be used to: switch the voltage value V of the target electrical signal. s When the signal falls within the first intensity range, the first level of drive current is output to the input terminal of the optical amplification module 100; when the voltage value V of the target electrical signal... s When the intensity falls within the second intensity range, the second level of drive current is output to the input terminal of the light amplification module 100.

[0041] In this way, by using the corresponding relationship between the two driving current levels and the two intensity ranges, the gain of the optical amplifier module 100 can be quickly controlled, simplifying the system structure while ensuring basic functions.

[0042] For example, in one embodiment, when there are two levels of drive current, taking the communication terminal of the optical amplification module 100 as the optical input terminal of the optical amplification module 100 as an example, refer to... Figure 8 When the communication terminal of the optical amplification module 100 is the optical input terminal of the optical amplification module 100, the switching module 210 is used to: switch the voltage value V of the target electrical signal. s When the signal falls within the first intensity range, the first level of drive current is output to the input of the optical amplification module; when the voltage value V of the target electrical signal... s When the intensity falls within the second intensity range, the second level of drive current is output to the input terminal of the optical amplification module.

[0043] In the case where the communication terminal of the optical amplification module 100 is the optical input terminal of the optical amplification module 100, the first intensity range characterizes the voltage value V of the target electrical signal. s Less than the voltage threshold V o The second intensity interval characterizes the voltage value V of the target electrical signal. s Greater than or equal to the voltage threshold V o The range.

[0044] Wherein, voltage threshold V o The dynamic range requirement of the optical communication system is preset. When the voltage value V of the target electrical signal... s Falling into the first intensity range, that is, the voltage value Vs of the target electrical signal is less than V. o When the target light signal intensity is low, it indicates that the target electrical signal voltage value V is low. sFalling into the second intensity range, i.e., V s Greater than or equal to V o When the target light signal intensity is high, it indicates that the target light signal intensity is high.

[0045] In this embodiment of the application, if the voltage value V of the target electrical signal s If the signal falls into the first intensity range, it means that a low-intensity input light signal is input to the optical amplifier module 100. In this case, the switching module 210 outputs the first level of drive current. By outputting a larger drive current to the input terminal of the optical amplifier module 100, the optical amplifier module 100 operates in a high-gain amplification mode so that the weak light signal is fully amplified to meet the high sensitivity requirements of the system.

[0046] In this embodiment of the application, if the voltage value V of the target electrical signal s If the signal falls into the second intensity range, it means that a higher intensity input optical signal is input to the optical amplifier module 100. In this case, the switching module 210 outputs the second level of drive current. By outputting a smaller drive current to the input terminal of the optical amplifier module 100, the optical amplifier module 100 operates in a low gain amplification mode so that the intensity of the amplified optical signal is lower than the overload threshold of subsequent circuits (such as the transimpedance amplifier TIA), thus avoiding system saturation failure.

[0047] Thus, this embodiment of the application achieves feedforward control by sampling at the optical input end of the optical amplification module 100. The gain is predicted and adjusted according to the intensity before the input optical signal enters the optical amplification module 100, so that the gain adjustment is completed before the optical signal is amplified, completely avoiding the risk of overload of subsequent circuits.

[0048] For example, in another embodiment, when there are two levels of drive current, taking the communication terminal of the optical amplification module 100 as the optical output terminal of the optical amplification module 100 as an example, in order to avoid the problem of subsequent modules (such as target module 400) being overloaded due to the voltage intensity corresponding to the output optical signal, refer to Figure 7 When the communication terminal of the optical amplification module 100 is the optical output terminal of the optical amplification module 100, the switching module 210 is used to: switch the voltage value V of the target electrical signal. s When the signal falls within the first intensity range, the controller outputs the first level of drive current to the input of the light amplification module; when the voltage value V of the target electrical signal... s When the intensity falls within the second intensity range, the control outputs the second level of drive current to the input terminal of the light amplification module.

[0049] In the case where the communication terminal of the optical amplification module 100 is the optical output terminal of the optical amplification module 100, the first intensity range characterizes the voltage value V of the target electrical signal. s Greater than or equal to the voltage threshold V oAnd less than the voltage saturation value V max The first intensity interval; the second intensity interval characterizes the voltage value V of the target electrical signal. s Less than the voltage threshold V o The range, or the voltage value V of the target electrical signal. s Greater than or equal to the voltage saturation value V max The range; voltage saturation value V max Greater than the voltage threshold V o .

[0050] Among them, the voltage saturation value V max This can be understood as an upper limit threshold voltage, which is the voltage value V of the target electrical signal. s Greater than the voltage saturation value V max This indicates that the optical signal output from the optical output terminal of the optical amplifier module 100 is close to the saturation operating point of the optical communication system. Voltage threshold V o This can be understood as distinguishing the threshold points corresponding to different current levels, at the voltage value V of the target electrical signal. s Because the voltage threshold V was not reached o When the voltage falls within the second intensity range, a second-level drive current is provided; at the target electrical signal voltage value V s Because the voltage threshold V has been reached o In scenarios falling within the first intensity range, the first level of drive current is provided.

[0051] In this embodiment of the application, if the voltage value V of the target electrical signal s Falling into the first intensity range indicates that the low-intensity input optical signal is amplified by the high-gain optical amplifier module 100 before being output. This suggests that the optical amplifier module 100 may have previously been operating in high-gain amplification mode with a first-level drive current, resulting in a voltage value V of the target electrical signal. s Greater than or equal to the voltage threshold V o And less than the voltage saturation value V max In this case, the switching module 210 continues to output the first level of drive current. By maintaining the switching module 210 outputting the first level of drive current to the input terminal of the optical amplifier module 100, the optical amplifier module 100 continues to maintain the high gain mode and the voltage value V of the target electrical signal remains constant. s Less than the voltage saturation value V max This ensures stable amplification of weak signals while avoiding over-amplification that could overload subsequent modules.

[0052] In this embodiment of the application, if the voltage value V of the target electrical signal s Falling into the second intensity range and being less than the voltage threshold V oThe range indicates that either a low-intensity or high-intensity input optical signal is amplified by the low-gain output of the optical amplifier module 100. This suggests that prior to this, the optical amplifier module 100 may have been operating in low-gain amplification mode with a second-level drive current, resulting in a voltage value V of the target electrical signal. s Less than the voltage threshold V o In this case, the switching module 210 maintains the output of the second level of drive current. By maintaining the switching module 210 outputting the second level of drive current to the input terminal of the optical amplifier module 100, the optical amplifier module 100 continues to maintain the low gain mode, avoiding the problem of excessive signal amplification leading to overload of subsequent modules.

[0053] In this embodiment of the application, if the voltage value V of the target electrical signal s Falling into the second intensity range and exceeding the voltage saturation value V max The range indicates that the high-intensity input optical signal is amplified by the high-gain optical amplifier module 100 before being output. This suggests that the optical amplifier module 100 may have been operating in high-gain amplification mode with the first level of drive current before this, causing the voltage value V of the target electrical signal to be... s Greater than the voltage saturation value V max In this case, the drive current of the first gear is switched to the drive current of the second gear, thereby controlling the switching module 210 to output the drive current of the second gear to the input terminal of the optical amplifier module 100, so that the optical amplifier module 100 switches to low gain mode, reduces the amplification factor of strong signals, and prevents the subsequent circuit from being overloaded.

[0054] Thus, this embodiment of the application achieves closed-loop feedback control by sampling at the optical output end of the optical amplification module 100. The gain of the optical amplification module 100 is adjusted in reverse according to the intensity of the amplified output optical signal, so that the intensity of the output optical signal is always maintained within a reasonable range. This ensures the amplification effect of the signal and avoids the problem of overloading of subsequent modules after the input optical signal (whether it is a strong or weak light signal) is excessively amplified.

[0055] For example, refer to Figure 9When the communication terminal of the optical amplification module 100 is the optical output terminal of the optical amplification module 100, the switching module 210 includes a first comparator 211, a second comparator 212, and a decision unit 213; the first input terminal of the first comparator 211 is connected to the first reference voltage terminal, the second input terminal of the first comparator 211 is used to receive the target electrical signal, and the output terminal of the first comparator 211 is connected to the first input terminal of the decision unit 213; the first input terminal of the second comparator 212 is used to receive the target electrical signal, the second input terminal of the second comparator 212 is connected to the second reference voltage terminal, and the output terminal of the second comparator 212 is connected to the second input terminal of the decision unit 213; the third and fourth input terminals of the decision unit 213 are used to receive the two levels of drive current provided by the drive current source 220.

[0056] The first input terminal G1 of the switching module 210 is an external port that can be connected to the output terminal of the external photodetector 231, allowing the first input terminal G1 of the switching module 210 to acquire the target electrical signal from the photodetector 231. Internally, the first input terminal G1 of the switching module 210 can be connected to the second input terminal of the first comparator 211 and the first input terminal of the second comparator 212, respectively, allowing the second input terminal of the first comparator 211 and the first input terminal of the second comparator 212 to receive the target electrical signal from the first input terminal G1 of the switching module 210.

[0057] The first reference voltage provided by the first reference voltage terminal includes the voltage saturation value V. max The second reference voltage provided at the second reference voltage terminal includes a voltage threshold V. o ; The working principle of the switching module 210 is shown in the table below:

[0058] The first comparator 211 is used to compare the voltage value V of the target electrical signal. s With voltage saturation value V max The size of the first comparison result is output.

[0059] For example, the voltage value V of the target electrical signal s Less than the voltage saturation value V max In this case, the first comparison result output by the first comparator 211 is 1. When the voltage value V of the target electrical signal... s Greater than the voltage saturation value V max In the case of , the first comparison result output by the first comparator 211 is 0.

[0060] The second comparator 212 is used to compare the voltage value V of the target electrical signal. s With voltage threshold V o The size of the second comparison result is determined, and the second comparison result is output.

[0061] For example, the voltage value V of the target electrical signal s Less than the voltage threshold V o In this case, the second comparison result output by the second comparator 212 is 0. When the voltage value V of the target electrical signal... s Greater than the voltage threshold V o In the case of , the second comparison result output by the second comparator 212 is 1.

[0062] The decision unit 213 is used to perform an AND operation on the first comparison result and the second comparison result to generate a decision result, which is used to determine the drive current of the target gear.

[0063] The third and fourth input terminals of the decision unit 213 are connected to the two output terminals of the drive current source 220, respectively, allowing the decision unit 213 to obtain the drive current for the two gears provided by the drive current source 220. Furthermore, the decision unit 213 can determine the drive current for the target gear from the drive currents of the two gears based on the generated decision result. The output terminal of the decision unit 213 is connected to the output terminal G2 of the switching module 210, causing the output terminal G2 of the switching module 210 to output the drive current for the target gear.

[0064] For example, the voltage value V of the target electrical signal s Less than the voltage saturation value V max And the voltage value V of the target electrical signal s Less than the voltage threshold V o In this case, the first comparison result output by the first comparator 211 is 1, the second comparison result output by the second comparator 212 is 0, the decision result output by the decision unit 213 is 0, and the corresponding switching module 210 outputs the second level of drive current to the input terminal of the optical amplifier module 100.

[0065] For example, the voltage value V of the target electrical signal s Less than the voltage saturation value V max And the voltage value V of the target electrical signal s Greater than the voltage threshold V o In this case, the first comparison result output by the first comparator 211 is 1, the second comparison result output by the second comparator 212 is 1, the decision result output by the decision unit 213 is 1, and the corresponding switching module 210 outputs the first gear drive current to the input terminal of the optical amplifier module 100.

[0066] For example, the voltage value V of the target electrical signals Greater than the voltage saturation value V max And the voltage value V of the target electrical signal s Greater than the voltage threshold V o In this case, the first comparison result output by the first comparator 211 is 0, the second comparison result output by the second comparator 212 is 1, the decision result output by the decision unit 213 is 0, and the corresponding switching module 210 outputs the second level of drive current to the input terminal of the optical amplifier module 100.

[0067] In practical applications, it is assumed that the optical amplification module 100 receives a low-intensity input optical signal at the current stage, and the input terminal of the optical amplification module 100 obtains the first level of drive current (a larger drive current) at the current stage.

[0068] If the optical amplification module 100 receives a higher intensity input optical signal in the next stage, and the input terminal of the optical amplification module 100 still maintains the first level of drive current (a larger drive current), it will cause the voltage value V of the target electrical signal to increase. s Greater than the voltage saturation value V max In this case, due to the voltage saturation value V max Greater than the voltage threshold V o The voltage value V of the target electrical signal s It must also be greater than the voltage threshold V. o The first comparator 211 outputs a first comparison result of 0, the second comparator 212 outputs a second comparison result of 1, and the decision unit 213 outputs a decision result of 0. The corresponding control switching module 210 outputs a second-level drive current to the input terminal of the optical amplifier module 100 (that is, the first-level drive current in the current stage is switched to the second-level drive current in the next stage), so that the optical amplifier module 100 switches to a low-gain mode, reduces the amplification factor of strong signals, and prevents the subsequent circuit from being overloaded.

[0069] If the optical amplification module 100 still receives a low-intensity input optical signal in the next stage, and the input terminal of the optical amplification module 100 maintains the first-level drive current (a relatively large drive current), it will cause the voltage value V of the target electrical signal to decrease. s Greater than the voltage threshold V o But less than the voltage saturation value V max The first comparison result output by the first comparator 211 is 1, the second comparison result output by the second comparator 212 is 1, and the decision result output by the decision unit 213 is 1. Thus, the switching module 210 maintains the first level of drive current output to the input terminal of the optical amplifier module 100, so that the optical amplifier module 100 continues to maintain the high gain mode and ensures stable amplification of weak signals.

[0070] In some embodiments of this application, to achieve finer control over the gain of the optical amplification module, the drive current can have three levels; among the three levels of drive current, the first level drive current is greater than the second level drive current, and the second level drive current is greater than the third level drive current; the intensity range includes a first intensity range, a second intensity range, and a third intensity range; the first intensity range corresponds to the first level drive current, the second intensity range corresponds to the second level drive current, and the third intensity range corresponds to the third level drive current. Therefore, the switching module 210 can be used to: when the voltage value V of the target electrical signal... s When the signal falls within the first intensity range, the first level of drive current is output to the input terminal of the optical amplification module 100; when the voltage value V of the target electrical signal... s When the signal falls within the second intensity range, the second level of drive current is output to the input terminal of the optical amplification module 100; when the voltage value V of the target electrical signal... s When the intensity falls within the third intensity range, the third level of drive current is output to the input terminal of the optical amplification module.

[0071] In this way, by using the corresponding relationship between the three levels of drive current and the three intensity ranges, the gain of the optical amplifier module 100 is controlled in three ways, which can more precisely match the input optical signals of different intensities and further optimize the system's sensitivity and dynamic range performance.

[0072] For example, in one embodiment, when there are three levels of drive current, taking the communication terminal of the optical amplification module 100 as the optical input terminal of the optical amplification module 100 as an example, when the communication terminal of the optical amplification module 100 is the optical input terminal of the optical amplification module 100, the first intensity range characterizes the voltage value V of the target electrical signal. s Less than the first voltage threshold V o1 The first intensity interval; the second intensity interval characterizes the voltage value V of the target electrical signal. s Greater than or equal to the first voltage threshold V o1 And less than the second voltage threshold V o2 The third intensity interval characterizes the voltage value V of the target electrical signal. s Greater than or equal to the second voltage threshold V o2 The range; the first voltage threshold V o1 Less than the second voltage threshold V o2 .

[0073] Wherein, the first voltage threshold V o1 Second voltage threshold V o2 The dynamic range requirements of the optical communication system are preset. First voltage threshold V. o1The first voltage threshold corresponds to a lower optical signal intensity threshold, while the second voltage threshold Vo2 corresponds to a higher optical signal intensity threshold. By setting two voltage thresholds, the intensity of the target optical signal is divided into three intervals, corresponding to low intensity, medium intensity, and high intensity, respectively.

[0074] In this embodiment of the application, if the voltage value V of the target electrical signal s If the signal falls into the first intensity range, it means that a low-intensity input optical signal is input to the optical amplifier module 100. In this case, the switching module 210 outputs the first level of drive current. By outputting the maximum drive current to the input terminal of the optical amplifier module 100, the optical amplifier module 100 operates in a high-gain amplification mode so that the weak optical signal is fully amplified to meet the high sensitivity requirements of the system.

[0075] In this embodiment of the application, if the voltage value V of the target electrical signal s If the signal falls into the second intensity range, it means that a medium-intensity input optical signal is input to the optical amplifier module 100. In this case, the switching module 210 outputs the second level of drive current. By outputting a medium-sized drive current to the input terminal of the optical amplifier module 100, the optical amplifier module 100 operates in medium-gain amplification mode to ensure that the amplified optical signal intensity is moderate, thus guaranteeing signal quality while avoiding the risk of overload.

[0076] In this embodiment of the application, if the voltage value V of the target electrical signal s If the signal falls into the third intensity range, it means that a relatively strong input optical signal is input to the optical amplifier module 100. In this case, the switching module 210 outputs the third level of drive current. By outputting the minimum drive current to the input terminal of the optical amplifier module 100, the optical amplifier module 100 operates in a low gain amplification mode so that the intensity of the amplified optical signal is lower than the overload threshold of the subsequent circuits, thus avoiding system saturation failure.

[0077] Thus, this embodiment of the application achieves more refined feedforward control by sampling at the optical input end of the optical amplification module 100 and adopting three-level control. It can accurately match the corresponding gain level according to the different intensity levels of the input optical signal, and maximize the dynamic range while ensuring sensitivity.

[0078] For example, in another embodiment, when there are three levels of drive current, taking the communication terminal of the optical amplification module 100 as the optical output terminal of the optical amplification module 100 as an example, in order to avoid the problem of subsequent modules being overloaded due to the voltage intensity corresponding to the output optical signal, when the communication terminal of the optical amplification module 100 is the optical output terminal, the first intensity range represents the voltage value V of the target electrical signal. s Less than the first voltage threshold V o1 The range, or the voltage value V of the target electrical signal. sGreater than or equal to the second voltage threshold V o2 And less than the voltage saturation value V max The first intensity interval; the second intensity interval characterizes the voltage value V of the target electrical signal. s Greater than or equal to the first voltage threshold V o1 And less than the second voltage threshold V o2 The third intensity interval characterizes the voltage value V of the target electrical signal. s Greater than or equal to the voltage saturation value V max The range; the first voltage threshold V o1 Less than the second voltage threshold V o2 Second voltage threshold V o2 Less than the voltage saturation value V max .

[0079] In this embodiment of the application, if the voltage value V of the target electrical signal s Falling into the first intensity range and being less than the first voltage threshold V o1 The range indicates that the low-intensity input optical signal is amplified by the optical amplifier module 100 at a lower gain before being output. This suggests that the optical amplifier module 100 may have been operating in a low-gain amplification mode with a third-level drive current before this, resulting in a lower voltage value V of the target electrical signal. s Less than the first voltage threshold V o1 In this case, the drive current of the third gear is switched to the drive current of the first gear, thereby controlling the switching module 210 to output the drive current of the first gear to the input terminal of the optical amplifier module 100, so that the optical amplifier module 100 switches to high gain mode to ensure stable amplification of weak signals.

[0080] In this embodiment of the application, if the voltage value V of the target electrical signal s Falling within the first intensity range and being greater than or equal to the second voltage threshold V o2 And less than the voltage saturation value V max The range indicates that the low-intensity input optical signal is amplified by the optical amplifier module 100 at a higher gain before being output. This suggests that the optical amplifier module 100 may have been operating in a high-gain amplification mode with the first level of drive current before this, resulting in a voltage value V of the target electrical signal. s Greater than or equal to the second voltage threshold V o2 And less than the voltage saturation value V max In this case, the control switching module 210 maintains the first level of drive current output to the input terminal of the optical amplifier module 100, so that the optical amplifier module 100 operates in high-gain mode and the voltage value V of the target electrical signal is... s Less than the voltage saturation value V max This ensures stable amplification of weak signals while avoiding over-amplification that could overload subsequent modules.

[0081] In this embodiment of the application, if the voltage value V of the target electrical signal s Falling into the second intensity range indicates that either a low-intensity input optical signal was amplified by the optical amplifier module 100 at a medium gain before being output, or a high-intensity input optical signal was amplified by the optical amplifier module 100 at a low gain before being output. This suggests that prior to this, the optical amplifier module 100 may have been operating in a medium-gain amplification mode with a second-level drive current, or in a low-gain amplification mode with a third-level drive current, causing the voltage value V of the target electrical signal to... s Greater than or equal to the first voltage threshold V o1 And less than the second voltage threshold V o2 In this case, the switching module 210 can maintain the output of the second level of drive current, or switch from the third level of drive current to the output of the second level of drive current, so that the optical amplifier module 100 operates in the medium gain mode, avoiding the problem of over-amplification of strong signals leading to overload of subsequent modules.

[0082] In this embodiment of the application, if the voltage value V of the target electrical signal s Falling into the third intensity range indicates that the high-intensity input optical signal is amplified by the optical amplifier module 100 at a higher or medium gain before being output. This suggests that the optical amplifier module 100 may have previously operated in a high-gain amplification mode with a first-level drive current or in a medium-gain amplification mode with a second-level drive current, causing the voltage value V of the target electrical signal to... s Greater than the voltage saturation value V max In this case, the drive current of the first gear (or the second gear) is switched to the drive current of the third gear, thereby controlling the switching module 210 to output the drive current of the third gear to the input terminal of the optical amplifier module 100, so that the optical amplifier module 100 switches to low gain mode, reduces the amplification factor of strong signals, and avoids the problem of overload of subsequent circuits.

[0083] Thus, by sampling at the optical output end of the optical amplification module 100 and employing three-level control, this embodiment of the application achieves more refined closed-loop feedback control. It can accurately adjust the gain level according to the combination of the output optical signal intensity and the input optical signal type, achieving a smoother gain transition while ensuring a fast response.

[0084] In practical applications, the drive current source 220 provides at least two levels of drive current corresponding to multiple preset current values ​​on the power-current characteristic curve of the optical amplifier module 100. In the power-current (PI) characteristic curve of the optical amplifier module 100, with the horizontal axis representing the drive current I and the vertical axis representing the output optical power P, the slope Se = ΔP / ΔI represents the gain efficiency of the optical amplifier module 100. When Se = 0, it indicates that the optical amplifier module 100 is saturated, and further increasing the drive current will not increase the output optical power. From the current range of the PI curve, there is a region with a slope change ΔSe ≤ 10%, defined as the linear region. Within the linear region, the output optical power increases approximately linearly with the drive current.

[0085] For example, when there are two drive current levels, the preset current values ​​include: the maximum operating optical power P of the optical amplifier module 100. max The corresponding first current value I max And, the second current value I1 corresponding to the switching point optical power P1 of the optical amplification module 100.

[0086] Among them, the maximum operating optical power P max The saturation optical power P of the optical amplification module 100 can be used as a reference. sat Determine, for example, that P satisfies max =P sat -4dB. That is, find the point where Se=0 on the PI curve and obtain the saturation power P at that point. sat Then subtract 4dB to get P max Then according to P max The driving current value corresponding to the point on the PI curve determines I. max .

[0087] Among them, the switching point optical power P1 can be determined based on the maximum operating optical power P. max The dynamic range K of the optical communication system is determined, for example, satisfying P1=P max -K / 2±3dB. Wherein, the dynamic range K is the difference (in dB) between the system's maximum and minimum receiveable optical power (sensitivity). I1 is determined based on the drive current value corresponding to point P1 on the PI curve.

[0088] For example, when there are three levels of drive current, the preset current values ​​include: the maximum operating optical power P of the optical amplifier module 100. max The corresponding first current value I max The second current value I1 corresponding to the optical power P1 at the first switching point of the optical amplification module 100, and the third current value I2 corresponding to the optical power P2 at the second switching point of the optical amplification module 100; the first current value I max The third current value I2 is greater than the second current value I1; the third current value I2 is less than the second current value I1.

[0089] In the case where the communication end of the optical amplification module 100 is an optical input end, the optical power P1 at the first switching point is determined based on the maximum and minimum receivable optical power of the optical communication system. For example, the optical power P1 at the first switching point can be located between the maximum and minimum receivable optical power of the optical communication system. Preferably, the optical power P1 at the first switching point can be obtained by averaging the maximum and minimum receivable optical power of the optical communication system.

[0090] When the communication end of the optical amplifier module 100 is the optical output end, the optical power P1 at the first switching point is based on the maximum operating optical power P. max And the difference K between the maximum and minimum acceptable optical power is determined. For example, the optical power P1 at the first switching point is based on the maximum operating optical power P. max And the dynamic range K is determined, P1=P max -K / 2±3dB. The optical power P2 at the second switching point can be further determined based on the optical power P1 at the first switching point and the dynamic range K. For example, P2=P1-K / 3±3dB, or P2 can be selected at equal intervals within the linear region of the PI curve.

[0091] For example, refer to Figure 7 The optical amplification module 100 can be a semiconductor optical amplifier 110, the photoelectric conversion module 300 can include a photodiode PD, and the target module 400 can include a transimpedance amplifier TIA. The signal flow of the optical communication system 10 is as follows: the input optical signal enters the optical input terminal of the semiconductor optical amplifier 110, is amplified, and is output from the main optical output terminal to the photodiode PD. The photodiode PD converts the optical signal into a photocurrent, and the transimpedance amplifier TIA amplifies the photocurrent into a voltage signal for output. Simultaneously, the monitoring optical output terminal of the semiconductor optical amplifier 110 outputs a small portion of the amplified optical signal to the photodetector 231, which is then converted into a sampling voltage V by the sampling resistor 232. s The switching module 210 switches according to the sampled voltage V. s Based on the comparison result with the preset voltage threshold, the corresponding level of drive current is selected from the drive current source 220 and output to the drive current input terminal of the semiconductor optical amplifier 110, thereby adjusting its amplification factor.

[0092] Among them, reference Figure 10The diagram shows the operating range of the transimpedance amplifier (TIA). The TIA has an overload threshold, which is the voltage at which it switches between a non-overloaded state and an overloaded state. When the operating voltage of the TIA is less than the overload threshold, the TIA operates in the linear amplification region and is in a non-overloaded state. When the operating voltage of the TIA is greater than the overload threshold, the TIA operates in the overload region and is in an overloaded state.

[0093] The maximum receivable optical power of the optical communication system can be determined based on the overload threshold of the transimpedance amplifier (TIA). Specifically, the input photocurrent I of the transimpedance amplifier (TIA) is... in With output voltage V out Satisfy V out =I in ×R ref , where R ref This represents the transimpedance value of the transimpedance amplifier. When the output voltage V... out When the input optical power equals the overload threshold of the transimpedance amplifier TIA, the corresponding input optical power is the maximum receivable optical power of the system. If the input optical power of the semiconductor optical amplifier 110 exceeds the maximum receivable optical power of the optical communication system, the operating voltage of the transimpedance amplifier TIA may exceed the overload threshold, causing the transimpedance amplifier TIA to be in an overload state. Similarly, the maximum operating optical power P of the optical amplifier module 100... max It can also be related to the overload threshold of the transimpedance amplifier (TIA). For example, if the output optical power of the semiconductor optical amplifier 110 is greater than the maximum operating optical power P... max If the operating voltage of the transimpedance amplifier TIA exceeds the overload threshold, the transimpedance amplifier TIA will be in an overload state.

[0094] In this embodiment, the second switching point optical power P2 can be determined based on the first switching point optical power P1. For example, the second switching point optical power P2 can be located between the first switching point optical power P1 and the maximum receivable optical power of the optical communication system, or the second switching point optical power P2 can be located between the first switching point optical power P1 and the minimum receivable optical power of the optical communication system. Preferably, in the three-level scheme where the communication end is the optical input end, the interval between the maximum receivable optical power and the minimum receivable optical power can be divided into three equal parts, with P1 and P2 being two of the division points. In the three-level scheme where the communication end is the optical output end, the maximum operating optical power P2 can be determined based on the first switching point optical power P1. max The interval between P1 and P2 is further divided, with P2 being P max The dividing point or a specific proportion point between P1 and P2.

[0095] In this way, the embodiments of this application preset the drive current level based on the power-current characteristic curve of the optical amplification module 100 and associate each level with a specific power point, thereby realizing the quantitative determination of the drive current level and ensuring the designability and repeatability of the system.

[0096] In practical applications, when there are two drive current levels, the voltage threshold V o It can be obtained by multiplying the resistance value R of the sampling resistor 232, the preset weighting coefficient η, and the switching point optical power P1.

[0097] For example, the switching point optical power P1 is the power threshold of the target optical signal, and the voltage value V of the target electrical signal is... s Equal to voltage threshold V o In this case, the total optical power P at the communication end of the optical amplification module 100 is equal to the optical power P1 at the switching point. The voltage value V of the target electrical signal... s The total optical power P at the communication end of the optical amplification module 100 is proportional to the optical power P, such as V. s =η×P×R, where η is a preset weighting coefficient used to characterize the responsivity of the photodetector 231. The preset weighting coefficient η is positively correlated with the proportion X% of the total optical power P at the communication end of the optical amplification module 100, and R is the resistance value of the sampling resistor 232. Therefore, the corresponding voltage threshold V can be calculated based on P1. o =η×P1×R. By passing the voltage threshold V o Set to this value, when V s Less than V o When V indicates that the total optical power P at the communication end of the optical amplifier module 100 is less than P1, s ≥V o The time indicates that the total optical power P at the communication end of the optical amplifier module 100 is greater than or equal to P1.

[0098] Among them, reference Figure 11 The timing diagram shown illustrates the normal operation of an optical communication system. Regardless of whether the intensity of the input optical signal to the optical amplifier module 100 increases or decreases, the voltage threshold V is determined based on the optical power P1 at the switching point. o At this point, the switching module 210 can switch the drive current level in a timely manner, so that the output optical signal intensity of the optical amplifier module 100 can be quickly stabilized within a reasonable range after switching.

[0099] from Figure 11 As can be seen, when a sudden optical signal arrives, the system completes the gain switching in a very short time (less than 1 nanosecond), and the output optical signal does not show obvious overshoot or drop, indicating that the switching process is smooth and timely. It realizes the gain adjustment before the optical signal enters the subsequent circuit, and completely eliminates the problem of system temporary failure caused by feedback delay in the traditional solution.

[0100] Thus, in this embodiment of the application, the voltage threshold V is determined based on the optical power P1 at the switching point. o This achieves a precise correspondence between the voltage threshold and the optical power threshold, ensuring the accuracy of the switching timing.

[0101] Similarly, in practical applications, when there are three levels of drive current, the first voltage threshold V o1 The second voltage threshold V is obtained by multiplying the resistance R of sampling resistor 232, the preset weighting coefficient η, and the optical power P1 at the first switching point. o2 It can be obtained by multiplying the resistance value R of the sampling resistor 232, the preset weighting coefficient η, and the optical power P2 at the second switching point.

[0102] For example, V o1 =η×P1×R,V o2 =η×P2×R. Thus, V s <V o1 The total optical power P at the communication end of the corresponding optical amplification module 100 is less than the optical power P1 at the first switching point, V o1 ≤V s <V o2 The total optical power P at the communication end of the corresponding optical amplification module 100 is between the optical power P1 at the first switching point and the optical power P2 at the second switching point, V s ≥V o2 The total optical power P at the communication end of the corresponding optical amplification module 100 is greater than or equal to the optical power P2 at the second switching point.

[0103] Thus, in this embodiment of the application, the first voltage threshold V is determined based on the optical power P1 at the first switching point and the optical power P2 at the second switching point, respectively. o1 Second voltage threshold V o2 It achieves precise control of multi-speed switching.

[0104] In practical applications, when the communication end of the optical amplification module 100 is also the optical output end of the optical amplification module 100, the optical output end of the optical amplification module 100 is also connected to the input end of the photoelectric conversion module 300. The first output optical power of the optical amplification module 100 is greater than the second output optical power of the optical amplification module 100. The first output optical power is the optical power provided by the optical amplification module 100 to the photoelectric conversion module 300, and the second output optical power is the optical power of the target optical signal. When the communication end of the optical amplification module 100 is the optical input end of the optical amplification module 100, the first input optical power of the optical amplification module 100 is greater than the second input optical power of the optical amplification module 100; the first input optical power is the optical power input to the optical amplification module 100, and the second input optical power is the optical power of the target optical signal.

[0105] For example, when the communication end of the optical amplification module 100 is also its optical output end, the proportion of the optical power of the target optical signal is X%, and the proportion of the first output optical power is (100-X)%. Alternatively, when the communication end of the optical amplification module 100 is also its optical input end, the proportion of the optical power of the target optical signal is X%, and the proportion of the first input optical power is (100-X)%. In order to minimize the impact on the main optical path while ensuring sufficient monitoring signal strength, X% is typically less than 50%. For example, X% can be 1%, 5%, 10%, 20%, or 30%, etc. This application embodiment does not impose a specific limitation on the value of the proportion of the optical power of the target optical signal. In some preferred embodiments of this application, the value of X% ranges from 1% to 10%, which minimizes the power loss of the main optical path while ensuring monitoring accuracy.

[0106] Thus, by setting different beam splitting ratios, this embodiment of the application achieves reasonable control over the optical power loss of the main optical path, while ensuring that the intensity of the monitoring optical signal is sufficient for accurate judgment.

[0107] like Figure 12 As shown, this application embodiment also provides an optical communication terminal 1200, including: the optical communication system 10 provided in any of the above embodiments.

[0108] The optical communication terminal 1200 provided in this application embodiment may include, but is not limited to, optical line terminal (OLT), optical network unit (ONU), optical module, optical repeater, and optical cross-connect device. This application embodiment does not limit the specific type of optical communication terminal.

[0109] The optical communication terminal provided in this application includes the optical communication system provided in any of the above embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0110] like Figure 13 As shown in the embodiments of this application, an optical signal processing method is also provided, including: Step 1310: Obtain the target optical signal from the communication terminal of the optical amplification module; Step 1320: Determine the target intensity range to which the intensity of the target optical signal belongs; Step 1330: Output a target gain control signal corresponding to the target intensity range to the input terminal of the light amplification module; Different intensity ranges correspond to different gain control signals.

[0111] In this embodiment, the optical amplification module in step 1310 can be a semiconductor optical amplifier (SOA), and its communication end can be an optical input end or an optical output end. When the communication end is an optical output end, the amplified output optical signal is acquired, which is used to form closed-loop feedback control; when the communication end is an optical input end, the input optical signal is acquired, which is used to form feedforward control.

[0112] In this embodiment, the target intensity range in step 1320 can be two or three. When there are two intensity ranges, they are divided using a single voltage threshold; when there are three intensity ranges, they are divided using two voltage thresholds. The division of intensity ranges is pre-set based on the dynamic range requirements of the optical communication system.

[0113] In this embodiment, the gain control signal in step 1330 includes a drive current signal. The gain adjustment module includes a switching module and a drive current source. The switching module selects the corresponding level from multiple levels of drive current provided by the drive current source according to the target intensity range, and outputs it to the control terminal of the optical amplification module to adjust its amplification factor.

[0114] In this embodiment, the gain adjustment module may further include a light detection module, which is disposed between the communication end of the optical amplification module and the switching module. The method further includes: converting the target optical signal into a target electrical signal through the light detection module, wherein the voltage value of the target electrical signal is used to reflect the intensity of the target optical signal.

[0115] In this embodiment, the method further includes: presetting the drive current value for each level based on the power-current characteristic curve of the optical amplification module. For a two-level scheme, a first current value corresponding to the maximum operating optical power and a second current value corresponding to the optical power at the first switching point are preset; for a three-level scheme, a third current value corresponding to the optical power at the second switching point is also preset.

[0116] In this embodiment, the target optical signal is acquired from the communication terminal of the optical amplification module; the target intensity range to which the intensity of the target optical signal belongs is determined; and a target gain control signal corresponding to the target intensity range is output to the input terminal of the optical amplification module through the gain adjustment module; wherein different intensity ranges correspond to different gain control signals. Thus, by using the gain adjustment module to determine the gain control signal corresponding to the intensity range of the target optical signal and change the optical amplification factor of the optical amplification module, the intermediate steps of detection, subsequent circuit output, calculation, and gradual adjustment are eliminated, thereby improving the gain adjustment speed and enabling the optical amplification module to quickly respond to changes in the intensity of the input optical signal.

[0117] The optical signal processing method provided in this application embodiment can be executed by the optical communication system provided in any of the above embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0118] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0119] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0120] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above method embodiments and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0121] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0122] This application provides a computer program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above method embodiments and achieve the same technical effects. To avoid repetition, it will not be described again here.

[0123] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0124] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0125] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An optical communication system, characterized in that, include: An optical amplification module (100) and a gain adjustment module (200); the communication terminal of the optical amplification module (100) is connected to the input terminal of the gain adjustment module (200), and the output terminal of the gain adjustment module (200) is connected to the input terminal of the optical amplification module (100); The gain adjustment module (200) is used to determine the target intensity range to which the intensity of the target optical signal belongs, and outputs a target gain control signal corresponding to the target intensity range to the input terminal of the optical amplification module (100). The target optical signal is an optical signal from the communication terminal of the optical amplification module (100). Different intensity ranges correspond to different gain control signals.

2. The optical communication system according to claim 1, characterized in that, The communication terminal of the optical amplification module (100) is either the optical input terminal or the optical output terminal of the optical amplification module (100).

3. The optical communication system according to claim 1, characterized in that, The gain control signal includes the drive current; The gain adjustment module (200) includes: a switching module (210) and a drive current source (220) that provides at least two levels of drive current, wherein the levels of drive current correspond one-to-one with the intensity ranges. The switching module (210) has a first input terminal, multiple second input terminals, and an output terminal; the first input terminal of the switching module (210) is used to acquire a target electrical signal, which is obtained based on the target optical signal; the multiple second input terminals of the switching module (210) are respectively connected to the multiple output terminals of the driving current source (220); and the output terminal of the switching module (210) is connected to the input terminal of the optical amplification module (100). The switching module (210) is used to: according to the target intensity range, turn on the target second input terminal corresponding to the target gear from the plurality of second input terminals, so that the output terminal of the switching module (210) outputs the drive current of the target gear to the input terminal of the optical amplification module (100), wherein the target gear is the gear corresponding to the target intensity range among the at least two gears.

4. The optical communication system according to claim 3, characterized in that, The gain adjustment module (200) further includes: a light detection module (230); the communication terminal of the light amplification module (100) is connected to the first input terminal of the switching module (210) through the light detection module (230); The optical detection module (230) is used to: convert the target optical signal into a target electrical signal and output the target electrical signal to the first input terminal of the switching module (210); The intensity of the target electrical signal is used to reflect the intensity of the target optical signal.

5. The optical communication system according to claim 4, characterized in that, The optical detection module (230) includes a photodetector (231) and a sampling resistor (232). The input terminal of the photodetector (231) is connected to the communication terminal of the optical amplification module (100). The output terminal of the photodetector (231) is grounded through the sampling resistor (232). The output terminal of the photodetector (231) is also connected to the first input terminal of the switching module (210). The photodetector (231) is used to convert the target optical signal into a photocurrent signal; The sampling resistor (232) is used to generate the target electrical signal based on the photocurrent signal; The voltage value of the target electrical signal is used to reflect the intensity of the target electrical signal, and the voltage value of the target electrical signal is determined by the product of the current value of the photogenerated current signal and the resistance value of the sampling resistor (232).

6. The optical communication system according to claim 5, characterized in that, The drive current has two levels; in the two levels of drive current, the first level of drive current is greater than the second level of drive current. The intensity range includes a first intensity range and a second intensity range; The first intensity range corresponds to the driving current of the first gear, and the second intensity range corresponds to the driving current of the second gear. Wherein, when the communication terminal of the optical amplification module (100) is the optical input terminal of the optical amplification module (100), the first intensity range characterizes the voltage value (V) of the target electrical signal. s () less than the voltage threshold (V) o The second intensity range represents the voltage value (V) of the target electrical signal. s ) is greater than or equal to the voltage threshold (V) o () range; Alternatively, if the communication terminal of the optical amplification module (100) is the optical output terminal of the optical amplification module (100), the first intensity range characterizes the voltage value (V) of the target electrical signal. s ) greater than or equal to the voltage threshold (V o And less than the voltage saturation value (V) max The second intensity range represents the voltage value (V) of the target electrical signal. s The voltage threshold (V) is less than the voltage threshold. o The range of or the voltage value (V) of the target electrical signal. s ) is greater than or equal to the voltage saturation value (V) max The range of the voltage saturation value (V) max ) greater than the voltage threshold (V o ).

7. The optical communication system according to claim 6, characterized in that, When the communication terminal of the optical amplification module (100) is the optical output terminal of the optical amplification module (100), the switching module (210) includes a first comparator (211), a second comparator (212), and a decision unit (213); the first input terminal of the first comparator (211) is connected to the first reference voltage terminal, the second input terminal of the first comparator (211) is used to receive the target electrical signal, and the output terminal of the first comparator (211) is connected to the first input terminal of the decision unit (213); the first input terminal of the second comparator (212) is used to receive the target electrical signal, the second input terminal of the second comparator (212) is connected to the second reference voltage terminal, and the output terminal of the second comparator (212) is connected to the second input terminal of the decision unit (213); the third and fourth input terminals of the decision unit (213) are used to receive the two levels of drive current provided by the drive current source (220); The first reference voltage provided by the first reference voltage terminal includes a voltage saturation value (V). max The second reference voltage provided at the second reference voltage terminal includes a voltage threshold (V). o The first comparator (211) is used to compare the voltage value (Vs) of the target electrical signal with the voltage saturation value (V). max The second comparator (212) is used to compare the voltage value (Vs) of the target electrical signal with the voltage threshold (V) and output the first comparison result; o The first comparison result is output as the value of the first comparison result and the second comparison result; the decision unit (213) is used to perform AND processing on the first comparison result and the second comparison result to generate a decision result, which is used to determine the drive current of the target gear.

8. The optical communication system according to claim 6, characterized in that, The drive current source (220) provides at least two levels of drive current corresponding to multiple preset current values ​​on the power-current characteristic curve of the optical amplifier module (100). When there are two levels of drive current, the preset multiple current values ​​include: the maximum operating optical power (P) of the optical amplification module (100). max The first current value (I) corresponding to ) max ), and the second current value (I1) corresponding to the switching point optical power (P1) of the optical amplification module (100). Wherein, when the communication end of the optical amplification module (100) is an optical input end, the switching point optical power (P1) is determined based on the maximum and minimum receivable optical power of the optical communication system; where the communication end of the optical amplification module (100) is an optical output end, the switching point optical power (P1) is based on the maximum operating optical power (P... max The difference (k) between the maximum acceptable optical power and the minimum acceptable optical power is determined.

9. The optical communication system according to claim 8, characterized in that, When there are two levels of the drive current, the voltage threshold (V) o The value is obtained by multiplying the resistance of the sampling resistor (232), the preset weighting coefficient, and the switching point optical power (P1).

10. The optical communication system according to claim 6, characterized in that, When the communication terminal of the optical amplification module (100) is the optical output terminal of the optical amplification module (100), the optical output terminal of the optical amplification module (100) is also connected to the input terminal of the photoelectric conversion module (300). The first output optical power of the optical amplification module (100) is greater than the second output optical power of the optical amplification module (100). The first output optical power is the optical power provided by the optical amplification module (100) to the photoelectric conversion module (300), and the second output optical power is the optical power of the target optical signal. When the communication terminal of the optical amplification module (100) is the optical input terminal of the optical amplification module (100), the first input optical power of the optical amplification module (100) is greater than the second input optical power of the optical amplification module (100); the first input optical power is the optical power input to the optical amplification module (100), and the second input optical power is the optical power of the target optical signal.

11. An optical communication terminal, characterized in that, include: The optical communication system as described in any one of claims 1-10.

12. An optical signal processing method, characterized in that, include: The target optical signal is acquired from the communication end of the optical amplification module; Determine the target intensity range to which the intensity of the target optical signal belongs; The input terminal of the light amplification module outputs a target gain control signal corresponding to the target intensity range; Different intensity ranges correspond to different gain control signals.

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