CN220823082U - Optical signal receiving and processing module - Google Patents
Optical signal receiving and processing module Download PDFInfo
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- CN220823082U CN220823082U CN202322610580.3U CN202322610580U CN220823082U CN 220823082 U CN220823082 U CN 220823082U CN 202322610580 U CN202322610580 U CN 202322610580U CN 220823082 U CN220823082 U CN 220823082U
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Abstract
The utility model discloses an optical signal receiving and processing module, which comprises an optical detector, an amplifying module, a reference signal acquisition module and a comparison module; the optical detector is used for receiving an optical signal and converting the optical signal into an electrical signal; the amplifying module is connected with the optical detector and is used for receiving the electric signal and amplifying the electric signal to output an amplified signal; the reference signal acquisition module is connected with the amplifying module and is used for receiving the amplified signal and converting the amplified signal into a reference signal dynamically related to the amplified signal; the comparison module is respectively connected with the amplification module and the reference signal acquisition module, respectively receives the amplification signal and the reference signal, compares the amplification signal with the reference signal, and outputs a restoring signal according to a comparison result. The optical signal receiving and processing module of the utility model improves the intensity range of the receivable optical signal, reduces the degree of transmission distortion and improves the reliability and accuracy of signal transmission.
Description
Technical Field
The utility model belongs to the technical field of optical communication, and particularly relates to an optical signal receiving and processing module.
Background
Electrical signal transmission is typically performed using coaxial cable or wire. In the transmission process, the electric signal is easy to attenuate and deform, the accuracy and the reliability of the signal are affected, and the method is not suitable for long-distance transmission; in addition, the electrical signals are susceptible to interference from electromagnetic radiation and the like. Therefore, the electric signal is converted into the optical signal through the photoelectric conversion module, the optical signal is transmitted through the optical fiber, the limitation of long-distance transmission application is overcome, and the attenuation is small, the deformation is avoided and the interference is avoided in the long-distance transmission process.
But the optical signal needs to be converted into an electrical signal when it reaches the receiving end. Because the conversion efficiency of the optical signal into the electric signal is low, the optical signal is converted into a weak electric signal, and is easy to be interfered by noise and distorted by conversion. And excessive signal distortion can cause error codes or abnormal control circuits, thereby causing faults. Therefore, the optical signal processing module is crucial to receive and process the optical signal.
Disclosure of Invention
The utility model provides an optical signal receiving and processing module, which improves the intensity range of a received optical signal, reduces signal distortion and shortens signal transmission delay.
In order to solve the technical problems, the utility model is realized by adopting the following technical scheme:
An optical signal receiving and processing module comprises an optical detector, an amplifying module, a reference signal acquisition module and a comparison module;
The optical detector is used for receiving an optical signal and converting the optical signal into an electrical signal;
The amplifying module is connected with the optical detector and is used for receiving the electric signal and amplifying the electric signal to output an amplified signal;
The reference signal acquisition module is connected with the amplifying module and is used for receiving the amplified signal and converting the amplified signal into a reference signal dynamically related to the amplified signal;
The comparison module is respectively connected with the amplification module and the reference signal acquisition module, respectively receives the amplification signal and the reference signal, compares the amplification signal with the reference signal, and outputs a restoring signal according to a comparison result.
According to some specific embodiments of the application, the amplifying module comprises a transimpedance amplifier, a feedback resistor and a filter capacitor;
The feedback resistor is connected with the filter capacitor in parallel to form a first filter module, one end of the first filter module is connected with the inverting input end of the transimpedance amplifier, and the other end of the first filter module is connected with the output end of the transimpedance amplifier;
The light detector is a photosensitive diode, the positive electrode is grounded, and the negative electrode is connected with the inverting input end of the transimpedance amplifier; the non-inverting input terminal of the transimpedance amplifier is grounded.
According to some specific embodiments of the application, the positive power supply of the transimpedance amplifier is connected with a positive power supply, and the negative power supply is connected with a negative power supply with the same voltage value as the positive power supply.
According to some specific embodiments of the present application, the reference signal acquisition module includes a first resistor and a first capacitor;
One end of the first resistor is connected with the output end of the transimpedance amplifier, and the other end of the first resistor is connected with one end of the first capacitor; the other end of the first capacitor is grounded; and the common end of the first resistor and the first capacitor is connected with the comparison module.
According to some specific embodiments of the present application, the reference signal acquisition module further includes a second resistor, a third resistor, and a first power supply;
The common end of the first resistor and the first capacitor is connected with one end of the second resistor and one end of the third resistor; the other end of the second resistor is connected with the first power supply; the other end of the third resistor is grounded.
According to some specific embodiments of the application, the first power source is a 2.5V positive power source; the other end of the second resistor is connected with the positive electrode of the first power supply.
According to some specific embodiments of the application, the comparison module includes a comparator, a second power supply;
the common ends of the first resistor, the second resistor, the third resistor and the first capacitor are connected with the inverting input end of the comparator; the non-inverting input end of the comparator is connected with the output end of the transimpedance amplifier;
the positive power supply end of the comparator is connected with the second power supply, and the negative power supply end is grounded.
According to some specific embodiments of the application, the second power source is a 5V positive power source; and the positive power end of the comparator is connected with the positive electrode of the second power supply.
According to some specific embodiments of the present application, the apparatus further comprises a second filtering module, connected to the comparing module, for receiving the restored signal, filtering the restored signal to generate an output signal, and outputting the output signal.
According to some specific embodiments of the application, the second filtering module is a low pass filter.
Compared with the prior art, the utility model has the advantages and positive effects that: the optical signal receiving and processing module converts an amplified signal into a reference signal dynamically related to the amplified signal through the reference signal acquisition module; the restored signal is obtained by comparing the amplified signal with a reference signal associated with the amplified signal. Because the reference signal is dynamically related to the amplified signal, the reference signal and the amplified signal have a large probability of difference, so that the optical signal can be detected even if the intensity is insufficient, the intensity range of the receivable optical signal is improved, the sensitivity of signal conversion is improved, the receiving distortion of the optical signal is reduced, and the reliability and the accuracy of signal transmission are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a functional block diagram of an embodiment of a light receiving processing module according to the present utility model;
FIG. 2 is a schematic diagram showing the connection of functional modules of another embodiment of a light receiving and processing module according to the present utility model;
FIG. 3 is a schematic diagram of the circuit connections of an amplification module;
FIG. 4 is a schematic diagram of the circuit connections of the reference module acquisition module;
FIG. 5 is a schematic diagram of a comparison module circuit connection;
Fig. 6 is a waveform simulation diagram of one example of each signal.
In the drawing the view of the figure,
1. A photodetector; 2. an amplifying module; 3. a reference signal acquisition module; 4. a comparison module; 5. a second filtering module; 21. a first filtering module;
U1, a transimpedance amplifier; PD, photodiode; rf, feedback resistance; cs, filter capacitance; s1, amplifying a signal; s2, restoring the signal; s3, outputting a signal; r1, a first resistor; r2, a second resistor; r3, a third resistor; c1, a first capacitor; v1, a first power supply; v2, a second power supply; u2, comparator.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
Referring to fig. 1 and 2, the utility model discloses an optical signal receiving and processing module, which comprises an optical detector 1, an amplifying module 2, a reference signal acquisition module 3 and a comparison module 4.
The photodetector 1 is configured to receive an optical signal and convert the received optical signal into an electrical signal.
The amplifying module 2 is connected with the optical detector 1, and is used for receiving and amplifying the electric signal converted by the optical detector 1 and outputting an amplified signal S1.
The reference signal acquisition module 3 is connected to the amplifying module 2, and is configured to receive the amplified signal S1, convert the amplified signal S1 into a reference signal dynamically related to the amplified signal S1, and output the reference signal. The reference signal acquisition module 3 in the utility model adopts a median method to take the median value of the amplified signal S1 as the reference signal of the comparison module 4.
The comparison module 4 is respectively connected with the amplification module 2 and the reference signal acquisition module 3, respectively receives the amplified signal S1 and the reference signal, compares the amplified signal S1 with the reference signal, and outputs a restoring signal S2 according to the comparison result.
The optical signal receiving and processing module converts an amplified signal S1 into a reference signal dynamically related to the amplified signal S1 through a reference signal acquisition module 3; the restored signal S2 is obtained by comparing the amplified signal S1 with a reference signal associated with the amplified signal S1. Because the reference signal is dynamically related to the amplified signal S1, the reference signal and the amplified signal S1 have a large probability of difference, so that the optical signal can be detected even if the intensity is insufficient, the intensity range of the receivable optical signal is improved, the sensitivity of signal conversion is improved, the receiving distortion of the optical signal is reduced, and the reliability and accuracy of signal transmission are improved.
The specific circuit configuration and principle of the optical signal receiving processing module of the present utility model will be described in detail by means of specific embodiments.
According to some specific embodiments of the present application, referring to fig. 3, the amplifying module 2 includes a transimpedance amplifier U1, a feedback resistor Rf, and a filter capacitor Cs.
The feedback resistor Rf is connected in parallel with the filter capacitor Cs to form a first filter module 21, one end of which is connected to the inverting input terminal of the transimpedance amplifier U1, and the other end of which is connected to the output terminal of the transimpedance amplifier U1.
The photo detector 1 is a photo diode PD, the positive electrode of the photo diode PD is grounded, and the negative electrode of the photo diode PD is connected with the inverting input end of the transimpedance amplifier U1; the non-inverting input of the transimpedance amplifier U1 is grounded.
The light detector 1 of the light receiving processing module of the embodiment adopts a zero bias mode of the photodiode PD, so that the photodiode PD works very precisely and linearly, and dark current input noise interference caused by the photodiode PD under no-illumination condition is avoided.
The feedback resistor Rf forms voltage drop for weak current generated by the photodetector 1 through larger resistance value, and realizes conversion of photocurrent signals into voltage signals and output. The filter capacitor Cs is connected in parallel with the feedback resistor Rf to form a first filter module 21, which is low-pass filter, and the smaller the upper limit cut-off frequency is, the better the signal-to-noise ratio of the signal output is; however, the upper cutoff frequency cannot be lowered without limitation in order to ensure that no frequency distortion occurs.
The non-inverting input of the transimpedance amplifier U1 is grounded. That is, the reference ground of the transimpedance amplifier U1 is grounded, so that the amplified signal S1 output by the transimpedance amplifier U1 is used as a reference plane, interference of power supply ripple is eliminated, comparison of the amplified signal S1 by the back-end comparison module 4 and output of the restored signal S2 are facilitated, and the receiving sensitivity is improved.
According to some embodiments of the present application, referring to fig. 3, the positive power supply of the transimpedance amplifier U1 is terminated with a positive power supply, and the negative power supply is terminated with a negative power supply having a voltage value equal to that of the positive power supply.
That is, the positive power supply of the transimpedance amplifier U1 is terminated with a positive power supply, and the negative power supply is terminated with a negative power supply; the voltage values of the positive power supply and the negative power supply are equal and the polarities are opposite.
The transimpedance amplifier U1 of the optical signal receiving and processing module of the embodiment adopts dual power supply to effectively solve the signal distortion near the zero point of the amplified signal S1 and better solve the signal distortion.
According to some specific embodiments of the present application, referring to fig. 4, the reference signal acquisition module 3 includes a first resistor R1, a first capacitor C1; one end of the first resistor R1 is connected with the output end of the transimpedance amplifier U1, and the other end of the first resistor R1 is connected with one end of the first capacitor C1; the other end of the first capacitor C1 is grounded; the common terminal of the first resistor R1 and the first capacitor C1 is connected to the comparison module 4.
The amplified signal S1 of the optical signal receiving processing module of this embodiment is rapidly charged and discharged through the integrating circuit formed by the first resistor R1 and the first capacitor C1 to form a reference signal waveform with extremum between extremum of the amplified signal S1, and the extremum of the waveform of the reference signal is the median value of the extremum of the amplified signal S1 through adjustment of the parameters of the first resistor R1 and the first capacitor C1, so that the duty ratio distortion of the reduced signal S2 output when the amplified signal S1 and the reference signal are compared by the comparing module 4 is smaller, and the duty ratio distortion of the reduced signal S2 is reduced.
According to some specific embodiments of the present application, referring to fig. 4, the reference signal acquisition module 3 further includes a second resistor R2, a third resistor R3, and a first power supply V1.
The common end of the first resistor R1 and the first capacitor C1 is connected with one end of the second resistor R2 and one end of the third resistor R3; the other end of the second resistor R2 is connected with a first power supply V1; the other end of the third resistor R3 is grounded.
The optical signal receiving and processing module of the embodiment forms a threshold circuit through a second resistor R2, a third resistor R3 and a first power supply V1, and forms threshold voltage at the common end of the second resistor R2 and the third resistor R3 through the voltage division of the second resistor R2 and the third resistor R3 to the first power supply V1; the common terminal of the second resistor R2 and the third resistor R3 is connected with the common terminal of the first resistor R1 and the first capacitor C1 together and is connected with the comparison module 4, the reference signal and the threshold voltage are input into the comparison module 4 as the reference value of the comparison module 4, and when the voltage value of the reference signal is lower than the threshold voltage, the threshold voltage is used as the reference value of the comparison module 4.
The threshold circuit is arranged to solve the problem that the restoring signal S2 cannot normally turn from the positive level to the negative level when the reference signal is interfered or the optical signal is weaker or the low-frequency signal, and ensure the normal turning of the restoring signal S2. That is, the H/L state level is accurately transmitted by ensuring that the L-level restored signal S2 is output when no light (or weak light signal) is input and the high-level restored signal S2 is output when light is input.
Through the combination adjustment of the first resistor R1 and the first capacitor C1 and the setting of threshold circuit parameters, the optical signal receiving and processing module can receive optical signals in a wide range of 0 to minus 35dBm, can support the transmission of DC to 100Mbps bandwidth signals, and realizes the transmission of extremely low frequency state signals or DC signals.
According to some specific embodiments of the application, referring to fig. 4, the first power source V1 is a 2.5V positive power source; the other end of the second resistor R2 is connected to the positive electrode of the first power supply V1.
According to some specific embodiments of the present application, referring to fig. 5, the comparison module 4 includes a comparator U2, a second power supply V2.
The common end of the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1 is connected with the inverting input end of the comparator U2; the non-inverting input of the comparator U2 is connected with the output of the transimpedance amplifier U1.
The positive power supply terminal of the comparator U2 is connected to the second power supply V2, and the negative power supply terminal is grounded.
According to some specific embodiments of the application, referring to fig. 5, the second power supply V2 is a 5V positive power supply; the positive power supply end of the comparator U2 is connected with the positive electrode of the second power supply V2.
Fig. 6 is a schematic diagram illustrating waveform simulation of each signal after the optical signal enters the optical signal receiving and processing module according to the above embodiment. The output signal has an accurate square wave duty cycle and is free of distortion.
According to some specific embodiments of the present application, referring to fig. 2, the optical signal receiving and processing module further includes a second filtering module 5, which is connected to the output terminal of the comparing module 4, and receives and filters the restored signal S2 to generate and output an output signal S3.
According to some specific embodiments of the application, referring to fig. 2, the second filtering module 5 is a low-pass filter.
In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (10)
1. An optical signal receiving processing module, comprising:
the optical detector is used for receiving the optical signal and converting the optical signal into an electrical signal;
The amplifying module is connected with the optical detector and used for receiving the electric signal and amplifying the electric signal to output an amplified signal;
The reference signal acquisition module is connected with the amplifying module and is used for receiving the amplified signal and converting the amplified signal into a reference signal dynamically related to the amplified signal;
And the comparison module is respectively connected with the amplification module and the reference signal acquisition module, respectively receives the amplification signal and the reference signal, compares the amplification signal with the reference signal and outputs a restoring signal according to a comparison result.
2. The optical signal receiving and processing module according to claim 1, wherein the amplifying module comprises a transimpedance amplifier, a feedback resistor, and a filter capacitor;
The feedback resistor is connected with the filter capacitor in parallel to form a first filter module, one end of the first filter module is connected with the inverting input end of the transimpedance amplifier, and the other end of the first filter module is connected with the output end of the transimpedance amplifier;
The light detector is a photosensitive diode, the positive electrode is grounded, and the negative electrode is connected with the inverting input end of the transimpedance amplifier; the non-inverting input terminal of the transimpedance amplifier is grounded.
3. The optical signal receiving processing module of claim 2, wherein the positive power supply of the transimpedance amplifier is terminated with a positive power supply, and the negative power supply is terminated with a negative power supply of a voltage value equal to the positive power supply.
4. The optical signal receiving and processing module according to claim 3, wherein the reference signal acquisition module comprises a first resistor and a first capacitor;
One end of the first resistor is connected with the output end of the transimpedance amplifier, and the other end of the first resistor is connected with one end of the first capacitor; the other end of the first capacitor is grounded; and the common end of the first resistor and the first capacitor is connected with the comparison module.
5. The optical signal receiving and processing module according to claim 4, wherein the reference signal acquisition module further comprises a second resistor, a third resistor, and a first power supply;
The common end of the first resistor and the first capacitor is connected with one end of the second resistor and one end of the third resistor; the other end of the second resistor is connected with the first power supply; the other end of the third resistor is grounded.
6. The optical signal receiving processing module of claim 5, wherein the first power source is a 2.5V positive power source; the other end of the second resistor is connected with the positive electrode of the first power supply.
7. The optical signal receiving processing module of claim 5, wherein the comparison module comprises a comparator, a second power supply;
the common ends of the first resistor, the second resistor, the third resistor and the first capacitor are connected with the inverting input end of the comparator; the non-inverting input end of the comparator is connected with the output end of the transimpedance amplifier;
the positive power supply end of the comparator is connected with the second power supply, and the negative power supply end is grounded.
8. The optical signal receiving processing module of claim 7, wherein the second power source is a 5V positive power source; and the positive power end of the comparator is connected with the positive electrode of the second power supply.
9. The optical signal receiving processing module according to any one of claims 1 to 8, further comprising a second filtering module connected to the comparing module, for receiving the restored signal and filtering it to generate an output signal and outputting it.
10. The optical signal receiving processing module of claim 9, wherein the second filtering module is a low pass filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322610580.3U CN220823082U (en) | 2023-09-25 | 2023-09-25 | Optical signal receiving and processing module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322610580.3U CN220823082U (en) | 2023-09-25 | 2023-09-25 | Optical signal receiving and processing module |
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| CN220823082U true CN220823082U (en) | 2024-04-19 |
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| CN202322610580.3U Active CN220823082U (en) | 2023-09-25 | 2023-09-25 | Optical signal receiving and processing module |
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