Optical signal frequency recovery and detection system

Abstract

The utility model belongs to photoelectric signal processing technical field, concretely relates to a kind of optical signal frequency recovery and detection system, comprising: signal conversion module, optical signal is converted into electric signal;Signal amplification module, the electric signal is amplified after output;Optical frequency recovery unit is connected with the output end of the signal amplification module, to amplify after the electric signal processing, output the same square wave signal with optical signal frequency;Wherein the signal conversion module and signal amplification module are integrated in same package, form signal conversion and amplification unit;And the optical frequency recovery unit is connected with the output end of the signal conversion and amplification unit by single coaxial line.

Description

Technical Field

[0001] This utility model relates to the field of optoelectronic signal processing technology, and in particular to an optical signal frequency recovery and detection system. Background Technology

[0002] An optical signal frequency recovery and detection system is an electronic system that accurately extracts the frequency information of an optical signal and converts it into a digital signal. Its core objective is to stably restore the frequency characteristics of the original light wave in complex environments. Current technology uses photodiodes to convert the optical signal into an electrical signal, which is then transmitted to a PCB circuit board via signal lines. A signal amplification system on the PCB amplifies the weak electrical signal, and the amplified signal is then processed by a frequency recovery system to output a square wave signal synchronized with the optical frequency. This square wave signal is then detected by a frequency detection system.

[0003] Therefore, existing technologies suffer from the following problems: the electrical signal output by the photodiode (PD) is weak, it is not amplified before transmission, and the signal transmission distance is long, resulting in poor anti-interference capability, susceptibility to external interference, and signal distortion before reaching the PCB. Furthermore, existing technologies require separate power and signal lines, leading to complex wiring and high costs. Utility Model Content

[0004] The purpose of this invention is to provide an optical signal frequency recovery and detection system.

[0005] To address the aforementioned technical problems, this utility model provides an optical signal frequency recovery and detection system, comprising: a signal conversion module for converting an optical signal into an electrical signal; a signal amplification module for amplifying the electrical signal and outputting it; and an optical frequency recovery unit connected to the output terminal of the signal amplification module for processing the amplified electrical signal and outputting a square wave signal with the same frequency as the optical signal; wherein the signal conversion module and the signal amplification module are integrated in the same package to form a signal conversion and amplification unit; and the optical frequency recovery unit is connected to the output terminal of the signal conversion and amplification unit via a single coaxial cable.

[0006] Furthermore, the signal conversion and amplification unit includes: a photodiode and an operational amplifier; The cathode of the photodiode is connected to the inverting input of the operational amplifier, and its anode is grounded. The inverting input terminal of the operational amplifier is also connected to the output terminal of the operational amplifier via a gain resistor; and The output of the operational amplifier is connected to the optical frequency recovery unit via the coaxial cable.

[0007] Furthermore, the optical frequency recovery unit includes: a comparator; The non-inverting input of the comparator is connected to the output of the operational amplifier via the coaxial line, so that after processing the amplified electrical signal, a square wave signal with the same frequency as the optical signal is output.

[0008] Furthermore, it also includes a frequency detection unit, which is connected to the output terminal of the optical frequency recovery unit to detect the frequency of the square wave signal.

[0009] Furthermore, the frequency detection unit includes: a level conversion buffer module and a microprocessor module; The level conversion buffer module converts the level of the square wave signal to a level that matches the microprocessor module, and then outputs it to the microprocessor module; and The microprocessor module detects the frequency of the square wave signal.

[0010] The beneficial effects of this utility model are that the optical signal frequency recovery and detection system integrates the signal conversion module and the signal amplification module into the same package to form a signal conversion and amplification unit, which makes the amplified electrical signal output stable and has strong anti-interference ability. Moreover, the signal conversion and amplification unit transmits power and signal to the optical frequency recovery unit simultaneously through a single coaxial cable, which not only reduces costs but also ensures that the power and signal do not interfere with each other during transmission, thus solving the technical problems of signal distortion and inaccurate detection of optical frequency signals in the prior art.

[0011] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 The schematic diagrams of optical signal frequency recovery and detection systems involved in some embodiments are shown. Figure 2 Partial circuitry of the signal conversion and amplification unit involved in some embodiments is shown; Figure 3 Partial circuitry of the optical frequency recovery unit involved in some embodiments is shown; Figure 4 The following diagrams illustrate the signal conversion of the optical frequency recovery unit involved in some embodiments; Figure 5 A schematic diagram of a frequency detection unit involved in some embodiments is shown. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Existing technologies suffer from several drawbacks: the electrical signal output by the photodiode (PD) is weak, lacks amplification before transmission, and has a long transmission distance, resulting in poor signal immunity, susceptibility to external interference, and signal distortion before reaching the PCB. Furthermore, existing technologies require separate power and signal lines, leading to complex wiring and high costs.

[0017] Therefore, at least one embodiment provides an optical signal frequency recovery and detection system, comprising: a signal conversion module for converting an optical signal into an electrical signal; a signal amplification module for amplifying the electrical signal and outputting it; and an optical frequency recovery unit connected to the output terminal of the signal amplification module for processing the amplified electrical signal and outputting a square wave signal with the same frequency as the optical signal; wherein the signal conversion module and the signal amplification module are integrated in the same package to form a signal conversion and amplification unit; and the optical frequency recovery unit is connected to the output terminal of the signal conversion and amplification unit via a single coaxial cable.

[0018] The optical signal frequency recovery and detection system of this embodiment integrates the signal conversion module and the signal amplification module into the same package to form a signal conversion and amplification unit. This makes the amplified electrical signal output stable and has strong anti-interference ability. Furthermore, the signal conversion and amplification unit transmits power and signal to the optical frequency recovery unit simultaneously through a single coaxial cable. This not only reduces costs but also ensures that the power and signal transmission do not interfere with each other, solving the technical problems of signal distortion and inaccurate detection of optical frequency signals in the prior art.

[0019] The various non-limiting embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0020] like Figure 1As shown, this embodiment provides an optical signal frequency recovery and detection system, including: a signal conversion module for converting an optical signal into an electrical signal; a signal amplification module for amplifying the electrical signal and outputting it; and an optical frequency recovery unit connected to the output terminal of the signal amplification module to process the amplified electrical signal and output a square wave signal with the same frequency as the optical signal. The signal conversion module and the signal amplification module are integrated in the same package to form a signal conversion and amplification unit. The optical frequency recovery unit is connected to the output terminal of the signal conversion and amplification unit via a single coaxial cable.

[0021] In some embodiments, such as Figure 2 As shown, the signal conversion and amplification unit includes: a photodiode D1 and an operational amplifier OPA; the cathode of the photodiode D1 is connected to the inverting input terminal of the operational amplifier OPA, and its anode is grounded; the inverting input terminal of the operational amplifier OPA is also connected to the output terminal of the operational amplifier OPA via a gain resistor R2; and the output terminal of the operational amplifier OPA is connected to the optical frequency recovery unit via the coaxial line.

[0022] Specifically, the signal conversion module includes the photodiode, which converts optical signals into electrical signals, and the signal amplification module amplifies the weak electrical signals, thereby increasing the signal strength and enhancing the signal's anti-interference capability.

[0023] Specifically, such as Figure 2 As shown, when laser light shines on the photosensitive area of ​​photodiode D1, photodiode D1 outputs a weak current signal HS_PD+. This current signal HS_PD+ is amplified and converted into a voltage signal V by the gain resistor R2 in the operational amplifier (OPA) circuit. The value of voltage signal V is equal to the value of current signal HS_PD+ multiplied by the value of gain resistor R2. The amplified voltage signal V is then transmitted via a coaxial cable to the subsequent optical frequency recovery unit for processing.

[0024] In some embodiments, such as Figure 3 As shown, the optical frequency recovery unit includes a comparator U34; the non-inverting input of the comparator U34 is connected to the output of the operational amplifier OPA via the coaxial line, so as to process the amplified electrical signal and output a square wave signal with the same frequency as the optical signal.

[0025] Specifically, one end of the coaxial cable is connected to the non-inverting input of the comparator U34 via connector J29, and the other end is connected to the output of the operational amplifier OPA.

[0026] Specifically, the comparator U34 may be, for example, but not limited to, a comparator of the TLV3603 model.

[0027] Specifically, such as Figures 2 to 4 As shown, the voltage signal amplified by the operational amplifier OPA is a sinusoidal voltage signal V with a DC component superimposed. The DC component is filtered out by the DC blocking and AC passing characteristics of capacitor C8 to obtain a standard sinusoidal AC signal. In addition, since the coaxial line transmits the VCC3V3_PD power signal at the same time, the signal input to comparator U34 straddles VCC3V3_PD. Since the comparison voltage of comparator U34 is VCC3V3, and the voltage value is equal to VCC3V3_PD, the signal output by the operational amplifier OPA is output as a square wave signal after passing through comparator U34.

[0028] In some embodiments, the optical signal frequency recovery and detection system further includes a frequency detection unit connected to the output terminal of the optical frequency recovery unit to detect the frequency of the square wave signal.

[0029] In some embodiments, the frequency detection unit includes: a level conversion buffer module and a microprocessor module; the level conversion buffer module converts the level of the square wave signal to a level that matches the level of the microprocessor module and outputs it to the microprocessor module; and the microprocessor module detects the frequency of the square wave signal.

[0030] Specifically, such as Figure 5 As shown, the level conversion buffer module converts the square wave signal level output by comparator U34 from V1 to a level signal V2 that matches the microprocessor module IC. The microprocessor module IC uses existing algorithms such as pulse counting to detect the frequency of the square wave signal.

[0031] Specifically, the microprocessor module IC may be, for example but not limited to, a microprocessor of model LFE5U-25F-7BG256I.

[0032] In some embodiments, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and embedded program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action.

[0033] In addition, the functional modules in the various embodiments of this utility model can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0034] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a readable storage medium. Based on this understanding, the technical solution of this utility model, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This embedded software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this utility model.

[0035] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A system for optical signal frequency recovery and detection, characterized in that, include: The signal conversion module converts optical signals into electrical signals; The signal amplification module amplifies the electrical signal and outputs it. The optical frequency recovery unit is connected to the output terminal of the signal amplification module to process the amplified electrical signal and output a square wave signal with the same frequency as the optical signal. in The signal conversion module and the signal amplification module are integrated into the same package to form a signal conversion and amplification unit; and The optical frequency recovery unit is connected to the output of the signal conversion and amplification unit via a single coaxial cable.

2. The optical signal frequency recovery and detection system according to claim 1, characterized in that, The signal conversion and amplification unit includes: a photodiode and an operational amplifier; The cathode of the photodiode is connected to the inverting input of the operational amplifier, and its anode is grounded. The inverting input terminal of the operational amplifier is also connected to the output terminal of the operational amplifier via a gain resistor; and The output of the operational amplifier is connected to the optical frequency recovery unit via the coaxial cable.

3. The optical signal frequency recovery and detection system according to claim 2, characterized in that, The optical frequency recovery unit includes: a comparator; The non-inverting input of the comparator is connected to the output of the operational amplifier via the coaxial line, so that after processing the amplified electrical signal, a square wave signal with the same frequency as the optical signal is output.

4. The optical signal frequency recovery and detection system according to claim 1, characterized in that, Also includes: A frequency detection unit is connected to the output terminal of the optical frequency recovery unit to detect the frequency of the square wave signal.

5. The optical signal frequency recovery and detection system according to claim 4, characterized in that, Also includes: The frequency detection unit includes: a level conversion buffer module and a microprocessor module; The level conversion buffer module converts the level of the square wave signal to a level that matches the microprocessor module, and then outputs it to the microprocessor module; and The microprocessor module detects the frequency of the square wave signal.

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