CN113300775A - Signal transmitting apparatus, control method of signal transmitting apparatus, and optical communication device - Google Patents

Signal transmitting apparatus, control method of signal transmitting apparatus, and optical communication device Download PDF

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CN113300775A
CN113300775A CN202110574372.5A CN202110574372A CN113300775A CN 113300775 A CN113300775 A CN 113300775A CN 202110574372 A CN202110574372 A CN 202110574372A CN 113300775 A CN113300775 A CN 113300775A
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signal
transmitting
led
optical
signal transmitting
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CN113300775B (en
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高冠军
吕沛豪
赵方印
张家梁
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/502—LED transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

The invention provides a signal transmitting device, a control method of the signal transmitting device and an optical communication device.A first signal sampling value received by a signal receiving device is monitored, wherein the first signal sampling value is a light power value received by the signal receiving device when an LED optical signal transmitting unit and an LD optical signal transmitting unit of the signal transmitting device run at full power; determining the working mode of a transmitting unit of the signal transmitting equipment according to the relation between the first signal sampling value and the first threshold value; and controlling the signal transmitting equipment to operate according to the working mode of the transmitting unit. By implementing the invention, the applicability of the signal transmitting equipment is improved.

Description

Signal transmitting apparatus, control method of signal transmitting apparatus, and optical communication device
Technical Field
The invention relates to the field of underwater wireless optical communication, in particular to a signal transmitting device, a control method of the signal transmitting device and an optical communication device.
Background
The underwater wireless optical communication is an underwater high-speed communication mode, the communication mode needs a transmitting end to modulate data information into optical signals, a detector of a receiving end detects the optical signals, the optical signals carried according to light intensity changes are converted into the data information, and the receiving, the detection and the demodulation of the data information are completed.
However, the underwater channel conditions are complex and influenced by factors such as platform vibration, water flow and scattering particles, and underwater scenes are variable. At present, the single emission source can not realize the power self-adaptive matching between the emission end and the receiving end, thereby influencing the stable receiving and recovery of the signal of the receiving end and influencing the stability of the underwater optical communication. Therefore, a person skilled in the art needs to solve how to adaptively select a transmitting source in a complex scene to improve the adaptability of the transmitting end.
Disclosure of Invention
Therefore, an object of the present invention is to overcome the problem in the prior art that it is difficult to adaptively select a transmission source in a complex scene, and to provide a signal transmitting apparatus, a method for controlling the signal transmitting apparatus, and an optical communication device.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for controlling a signal transmitting apparatus, where the signal transmitting apparatus includes: an LED optical signal transmitting unit and an LD optical signal transmitting unit, the control method of the signal transmitting apparatus including: monitoring a first signal sampling value received by a signal receiving device, wherein the first signal sampling value is a light power value received by the signal receiving device when an LED light signal transmitting unit and an LD light signal transmitting unit of the signal transmitting device run at full power; determining the working mode of a transmitting unit of the signal transmitting equipment according to the relation between the first signal sampling value and a first threshold value; and controlling the signal transmitting equipment to operate according to the working mode of the transmitting unit.
Optionally, the determining an operating mode of a transmitting unit of the signal transmitting apparatus according to a relationship between the first signal sample value and a first threshold includes: judging whether the first signal sampling value is larger than the first threshold value or not; and when the first signal sampling value is not larger than the first threshold value, determining that the signal transmitting equipment is in a full-power working mode of a multi-transmitting unit.
Optionally, when the first signal sample value is greater than the first threshold, calculating a variance corresponding to the first signal sample value; and determining the single transmitting unit working mode of the signal transmitting equipment according to the relation between the variance and a second threshold value.
Optionally, the determining the single-transmitting-unit operating mode of the signal transmitting apparatus according to the relationship between the variance and the second threshold includes: judging whether the variance is larger than the second threshold value; when the variance is larger than the second threshold value, determining that the signal transmitting equipment is in an LED transmitting unit working mode; when the variance is not larger than the second threshold, acquiring the current communication distance between the signal transmitting equipment and the signal receiving equipment; and determining the working mode of the single transmitting unit of the signal transmitting equipment according to the communication distance.
Optionally, the determining the single transmission unit operating mode of the signal transmission device according to the communication distance includes: judging whether the communication distance is larger than a third threshold value; when the communication distance is larger than a third threshold value, determining that the signal transmitting equipment is in an LD transmitting unit working mode; and when the communication distance is not greater than a third threshold value, determining that the signal transmitting equipment is in an LED transmitting unit working mode.
Optionally, when the operating mode of the transmitting unit is a full-power operating mode of a single transmitting unit, the method for controlling the signal transmitting apparatus further includes: acquiring a second signal sampling value received by signal receiving equipment, wherein the second signal sampling value is a light power value received by the signal receiving equipment when the signal transmitting equipment runs at full power under a full-power working mode of the single transmitting unit; judging whether the second signal sampling value is smaller than a target optical power value under the current signal transmission bandwidth; and when the second signal sampling value is not less than the target optical power value, adjusting the transmitting speed of the transmitting unit corresponding to the full-power working mode of the single transmitting unit according to the relation between the second signal sampling value and the target optical power value.
Optionally, the method for controlling a signal transmitting apparatus further includes: and when the second signal sampling value is smaller than the target optical power value, reducing the signal transmission rate of the signal transmission equipment.
In a second aspect, an embodiment of the present invention provides a signal transmitting apparatus, including: the LED light signal emitting device comprises an LED light signal emitting unit, an LD light signal emitting unit and a control unit, wherein the LED light signal emitting unit is used for emitting an LED light signal; the LD optical signal transmitting unit is used for transmitting an LD optical signal; the control unit is configured to execute the method for controlling the signal emitting device according to the first aspect of the embodiment of the present invention, so as to control the LED optical signal emitting unit and/or the LD optical signal emitting unit to operate.
Optionally, the LED light signal emitting unit includes: the LED driving module is used for receiving a control signal sent by the control unit, conducting a current output loop of the LED driving module according to the control signal and sending a conducting signal to the LED power control module; the LED power control module is used for determining the conduction number of the lasers in the LED array according to the conduction signal and sending the conduction information to the corresponding lasers; and the LED array is used for conducting the corresponding laser according to the conducting information.
Optionally, the LD optical signal transmitting unit includes: the LD driving module is used for receiving a control signal sent by the control unit, conducting a current output loop of the LD driving module according to the control signal and sending the conducting signal to the LD power control module; the LD power control module is used for determining the conduction number of the lasers in the LD array according to the conduction signal and sending the conduction information to the corresponding lasers; the LD array is used for conducting the corresponding laser according to the conducting information; and the optical power beam combiner is used for combining the optical fibers coupled out by the conducted lasers into one optical fiber for output.
In a third aspect, an embodiment of the present invention provides an optical communication apparatus, including: transmitting system and receiving system, transmitting system includes: in the signal transmitting apparatus according to the second aspect of the embodiment of the present invention, the receiving system includes a signal receiving apparatus provided corresponding to the signal transmitting apparatus.
The technical scheme of the invention has the following advantages:
the control method of the signal transmitting equipment provided by the invention comprises the steps of monitoring a first signal sampling value received by the signal receiving equipment, wherein the first signal sampling value is a light power value received by the signal receiving equipment when an LED light signal transmitting unit and an LD light signal transmitting unit of the signal transmitting equipment run at full power; determining the working mode of a transmitting unit of the signal transmitting equipment according to the relation between the first signal sampling value and the first threshold value; and controlling the signal transmitting equipment to operate according to the working mode of the transmitting unit. Meanwhile, the LED and the LD are carried as signal light sources, so that the LED and the LD can be more flexibly applied to various working scenes, and the scenes requiring large signal coverage and the scenes requiring long-distance and high-speed signals can simultaneously appear in the same working scene. The communication device has greater applicability. Meanwhile, the power of the LD and the LED array is controllable, the optimal light source working array and the optimal output power can be selected according to an underwater scene, the power consumption can be reduced, and the service life of a device can be prolonged.
The present invention provides a signal transmitting apparatus, comprising: the LED light signal emitting device comprises an LED light signal emitting unit, an LD light signal emitting unit and a control unit, wherein the LED light signal emitting unit is used for emitting an LED light signal; the LD optical signal transmitting unit is used for transmitting an LD optical signal; the control unit is used for controlling the LED light signal transmitting unit and/or the LD light signal transmitting unit to work. Meanwhile, the LED and the LD are carried as signal light sources, so that the LED and the LD can be more flexibly applied to various working scenes, and the scenes requiring large signal coverage and the scenes requiring long-distance and high-speed signals can simultaneously appear in the same working scene. The communication device has greater applicability. Meanwhile, the power of the LD and the LED array is controllable, the optimal light source working array and the optimal output power can be selected according to an underwater scene, the power consumption can be reduced, and the service life of a device can be prolonged.
The optical communication device provided by the invention comprises: a transmitting system and a receiving system. Meanwhile, the LED and the LD are carried in the transmitting system to serve as signal light sources, so that the transmitting system can be more flexibly applied to various working scenes, and the optimal light source working array and the optimal output power can be selected according to the underwater scenes, thereby improving the stability of underwater optical communication.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of underwater wireless optical transmission according to an embodiment of the present invention;
fig. 2 is a flowchart of a specific example of a control method of a signal transmission apparatus in the embodiment of the present invention;
FIG. 3 is a diagram of a system structure for simultaneously mounting an LED and an LD according to an embodiment of the present invention;
FIG. 4 is a diagram of the structure of the LED and LD driving module according to the embodiment of the present invention;
FIG. 5 is a diagram of an LD/LED power control module with an LD/LED array according to an embodiment of the present invention;
FIG. 6 is a diagram of a programmable power supply according to an embodiment of the present invention;
FIG. 7 is a block diagram of an FPGA data processing module according to an embodiment of the present invention;
fig. 8 is a diagram of a delay module in an FPGA data processing module according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The underwater wireless optical communication is an underwater high-speed communication mode, the communication mode needs a transmitting end to modulate data information into optical signals, a detector of a receiving end detects the optical signals, the optical signals carried according to light intensity changes are converted into the data information, and the receiving, the detection and the demodulation of the data information are completed. Fig. 1 is a schematic view of underwater wireless optical transmission, in which a transmitting system is installed in an underwater monitoring sensor for transmitting monitored data in the sensor to an underwater robot, and a receiving system is installed in the underwater robot for receiving data information from the transmitting system. The sensors distributed on the sea bottom send data in an optical signal mode through the transmitting system, and the underwater robot receives the data sent by the sensors through the receiving system to finish the acquisition of the data in the underwater sensors. However, the underwater channel conditions are complex and influenced by factors such as platform vibration, water flow and scattering particles, and underwater scenes are variable. At present, the single emission source can not realize the power self-adaptive matching between the emission end and the receiving end, thereby influencing the stable receiving and recovery of the signal of the receiving end and influencing the stability of the underwater optical communication.
Therefore, to solve the above problems, an embodiment of the present invention provides a method for controlling a signal transmitting apparatus, where the signal transmitting apparatus includes: the control method of the LED optical signal transmitting unit, the LD optical signal transmitting unit, and the signal transmitting apparatus, as shown in fig. 2, includes the steps of:
step S1: monitoring a first signal sampling value received by the signal receiving equipment, wherein the first signal sampling value is a light power value received by the signal receiving equipment when an LED light signal transmitting unit and an LD light signal transmitting unit of the signal transmitting equipment run at full power.
In one embodiment, the signal transmitting device includes three modes of operation: mode 1: the LED arrays work independently; mode 2: the LD array works alone; mode 3: the LED array and the LD array operate simultaneously. In the initial stage, the working mode of the signal transmitting equipment is in mode 3, the LED array and the LD array are driven simultaneously, the LD and the LED array work at full power, and the first signal sampling value P received by the signal receiving equipment is monitored at the momentr，PrCan be represented by the following formula:
Pr＝PLED+PLD (1)
wherein, PrCan reflect the light power value P received by the signal receiving equipmentLEDFor the light power received from the LED array, PLDIs the optical power received from the LD array.
In the embodiment of the present invention, before obtaining the light power value received by the signal receiving device when the LED optical signal transmitting unit and the LD optical signal transmitting unit operate at full power, a communication link between the signal transmitting device and the signal receiving device needs to be established. Specifically, a synchronization frame is sent, whether communication is established or not is detected, if the communication cannot be established, the current distance is too far or other situations occur to cause communication failure, the synchronization frame is sent continuously, and connection establishment is attempted. If communication is established, monitoring of the first signal sample value received by the signal receiving device is commenced.
Step S2: and determining the working mode of the transmitting unit of the signal transmitting equipment according to the relation between the first signal sampling value and the first threshold value.
In one embodiment, the first signal sample value P is obtainedrThen, the first signal sampling value P is detectedrIn relation to the first threshold value, thereby determining the mode of operation of the transmitting unit of the transmitting device. Wherein the first threshold is the minimum optical power P of the single array light source communicationminThe minimum optical power communicated by the array light source when the LED array works alone or the LD array works alone is taken. In the embodiment of the invention, the first threshold is set according to actual needs.
In the embodiment of the present invention, determining the operation mode of the transmitting unit of the signal transmitting apparatus according to the relationship between the first signal sample value and the first threshold value includes the following steps:
step S21: and judging whether the first signal sampling value is larger than a first threshold value.
Step S22: and when the first signal sampling value is not larger than the first threshold value, determining that the signal transmitting equipment is in a full-power working mode of the multi-transmitting unit.
Step S23: when the first signal sampling value is larger than a first threshold value, calculating the variance corresponding to the first signal sampling value;
step S23: and determining the single transmitting unit working mode of the signal transmitting equipment according to the relation between the variance and the second threshold value.
In particular, a first signal sample value P is detectedrWhether the minimum optical power P of the single array light source communication is larger thanminIf P isr≤PminIt shows that the communication distance between the current signal receiving equipment and the signal transmitting equipment is longer, and the LED array and the LD array must be started at the same time with full power to realize communication; if P isr>PminIt is stated that the optical power in the current single emission unit operating mode meets the service requirement, and single light source array selection can be performed to reduce power consumption.
Further, when determining the single-transmitting-unit operating mode of the signal transmitting apparatus according to the relationship between the variance and the second threshold, the method includes the following steps:
step S231: and judging whether the variance is larger than a second threshold value.
Step S232: and when the variance is larger than a second threshold value, determining that the signal transmitting equipment is in the working mode of the LED transmitting unit.
Step S233: and when the variance is not larger than a second threshold value, acquiring the current communication distance between the signal transmitting equipment and the signal receiving equipment.
Step S234: and determining the single transmitting unit working mode of the signal transmitting equipment according to the communication distance.
Specifically, after the signal transmitting equipment is determined to be in the single transmitting unit working mode, one single transmitting unit working mode is selected optionally. For example, firstly selecting the current working mode of the signal transmitting equipment to be in the mode 1, and continuously collecting the first signal sampling value PrThen calculate P once per secondrAverage value of (2)
Figure BDA0003083781080000101
Sum variance σpAnd detecting σpReference value σ measured in a stable underwater environment whether or not it is greater than 2.5 times0. If σp>2.5σ0If the current underwater environment is unstable or the communication scene is unstable such as a high-speed moving state, the light path emitted by the LD is unstable, the communication effect is poor, the working mode keeps the mode 1 at all, and the LED array works independently. If σp≤2.5σ0Then both LD and LED arrays can be used for communication, taking into account the current underwater environment stability. In an embodiment of the invention, the second threshold is a reference value σ measured in a stable underwater environment0。
Further, the single transmitting unit working mode of the signal transmitting equipment is determined according to the communication distance, and the method comprises the following steps:
step S2341: and judging whether the communication distance is larger than a third threshold value.
Step S2342: and when the communication distance is greater than a third threshold value, determining that the signal transmitting equipment is in an LD transmitting unit working mode.
Step S2343: and when the communication distance is not greater than the third threshold value, determining that the signal transmitting equipment is in the working mode of the LED transmitting unit.
Specifically, after the signal transmitting device is determined to be in the single transmitting unit operating mode, it needs to be further determined whether the signal transmitting device is selected from the LD array or the LED array. Firstly, when the working mode is switched to the mode 1, the LED array works independently, whether the communication is normal or not is detected, if the communication is normal, the current equipment is short in distance, namely the communication distance is not greater than a third threshold value, the LD array does not need to be started, and only the LED array needs to be driven to work; if the communication is interrupted or the communication quality is poor, the current distance is far, namely the communication distance is larger than a third threshold value, the light signal emitted by the LED array is greatly attenuated, the communication cannot be completed, the working mode needs a switching value mode 2, and the LD array works independently. In the embodiment of the present invention, the third threshold is set according to actual needs.
Step S3: and controlling the signal transmitting equipment to operate according to the working mode of the transmitting unit.
In a specific embodiment, after the operating mode of the transmitting unit is determined, the transmitting unit modulates the data information into an optical signal and sends the optical signal to the signal receiving end, so that the receiving, the detecting and the demodulating of the data information are completed.
In this embodiment of the present invention, when the operating mode of the transmitting unit is the full-power operating mode of the multiple transmitting units, the method for controlling the signal transmitting apparatus further includes:
step S31: and acquiring a second signal sampling value received by the signal receiving equipment, wherein the second signal sampling value is a light power value received by the signal receiving equipment when the signal transmitting equipment runs at full power under a full-power working mode of the single transmitting unit.
Step S32: and judging whether the second signal sampling value is smaller than the target optical power value under the current signal transmission bandwidth.
Step S33: and when the second signal sampling value is not less than the target optical power value, adjusting the transmitting speed of the transmitting unit corresponding to the full-power working mode of the single transmitting unit according to the relation between the second signal sampling value and the target optical power value.
Particularly when the second message isAnd when the signal sampling value is smaller than the target optical power value, reducing the signal transmission rate of the signal transmission equipment. After the light source array is selected, the transmitting power is optimized, firstly, before the service is sent, the signal transmitting equipment and the signal receiving equipment can send a synchronous frame and a link state frame, the signal transmitting equipment analyzes the received link state frame, and a second signal sampling value P received by the signal receiving equipment can be obtainedt，PtCan be represented by the following formula:
Pt＝η·N·P0 (2)
wherein, P0The actual emitted light power of a single LD/LED laser, N is the number of lasers working in the current LD/LED array, and eta is the attenuation coefficient of the light power in the underwater communication environment. Second signal sample value PtThe larger the signal is, the more accurate the judgment of the judgment unit in the signal receiving equipment on the signal is, the lower the error rate of the received signal is, and the better the communication effect is. But the second signal sample value PtLimited by transmission bandwidth, the expression is as follows:
Pt＝fp(B) (3)
setting the current signal transmission bandwidth as B, and calculating the current optimal output signal value as P according to the formula (3)s. Further, according to the formula (2), P is knowntAnd the number N of lasers currently operating in the LD/LED array, the following can be derived:
Figure BDA0003083781080000131
the MCU can calculate the number N of the minimum lasers started by the LD/LED array under the condition of meeting the current communication bandwidth requirementsAnd controls the data processor to perform the setting.
If N is presents>NmaxThat is, the maximum working power of the current light source array cannot meet the service requirement, that is, the second signal sampling value is smaller than the target optical power value. According to equation (3) and the maximum received optical power PmaxBackward deducing maximum service bandwidth B, reducing signal transmission of signal transmission equipmentThe rate. In the embodiment of the present invention, the target optical power value is an optical power value corresponding to a maximum laser activated by the LD/LED array. Further, the bit error rate is continuously detected during the service communication process, and if the communication quality is deteriorated in a period of time, the strategy is repeatedly adjusted to select the optimal working mode and power.
The control method of the signal transmitting equipment provided by the invention comprises the steps of monitoring a first signal sampling value received by the signal receiving equipment, wherein the first signal sampling value is a light power value received by the signal receiving equipment when an LED light signal transmitting unit and an LD light signal transmitting unit of the signal transmitting equipment run at full power; determining the working mode of a transmitting unit of the signal transmitting equipment according to the relation between the first signal sampling value and the first threshold value; and controlling the signal transmitting equipment to operate according to the working mode of the transmitting unit. Meanwhile, the LED and the LD are carried as signal light sources, so that the LED and the LD can be more flexibly applied to various working scenes, and the scenes requiring large signal coverage and the scenes requiring long-distance and high-speed signals can simultaneously appear in the same working scene. The communication device has greater applicability. Meanwhile, the power of the LD and the LED array is controllable, the optimal light source working array and the optimal output power can be selected according to an underwater scene, the power consumption can be reduced, and the service life of a device can be prolonged.
An embodiment of the present invention further provides a signal transmitting apparatus, as shown in fig. 3, including: the LED light signal emitting device comprises an LED light signal emitting unit, an LD light signal emitting unit and a control unit, wherein the LED light signal emitting unit is used for emitting an LED light signal and the LD light signal emitting unit is used for emitting an LD light signal; the control unit is used for executing the control method of the signal transmitting equipment so as to control the LED optical signal transmitting unit and/or the LD optical signal transmitting unit to work.
In a specific embodiment, the LED optical signal emitting unit includes: the LED driving module is used for receiving a control signal sent by the control unit, conducting a current output loop of the LED driving module according to the control signal and sending the conducting signal to the LED power control module; the LED power control module is used for determining the conduction number of the lasers in the LED array according to the conduction signal and sending the conduction information to the corresponding lasers; the LED array is used for conducting the corresponding laser according to the conducting information.
In the embodiment of the present invention, the LED driving module is composed of a comparator and a field effect transistor, as shown in fig. 4. The field effect transistor is used for directly mounting a load. The load LED is mounted on the drain electrode of the field effect tube, wherein the anode of the DC power supply is connected with the anode of the load LED, the cathode of the DC power supply is connected with the drain electrode of the field effect tube, and the cathode of the DC power supply is grounded with the source electrode of the field effect tube. The DC supply voltage is determined by the nominal operating voltage of the load LED array. The comparator is used for controlling the on-off of the field effect tube so as to control the on-off of the load LED. The input end of the comparator is a driving signal input end, and the other end of the comparator is a voltage threshold setting end. An external voltage driving signal is input into the module through the driving signal input end, the power supply threshold can be obtained by dividing the voltage of the power supply of the comparator through the resistor, and the obtained stable direct-current voltage signal is input into the voltage threshold setting end. The power supply voltage of the comparator is direct-current voltage obtained by the DC power supply voltage through the linear voltage stabilization chip. The output end of the comparator is connected with the grid of the field effect transistor.
Specifically, the LED driving module works in the following manner: an external voltage driving signal is input to the driving signal input end; the comparator compares the input signal voltage with a voltage threshold, and outputs a high level when the input signal voltage is higher than the threshold voltage and outputs a zero level when the input signal voltage is lower than the threshold voltage; the level signal output by the comparator is input to the grid electrode of the field effect tube, when the grid electrode voltage is high level, the field effect tube enters a saturation working area, the drain electrode and the source electrode are conducted, current passes through a load, and the load LED emits light. When the grid voltage is at zero level, the field effect transistor enters a cut-off working region, the drain-source electrode is disconnected, no current passes through the load, and the load LED does not emit light.
The LED power control module and LED array are shown in fig. 5: the LED driving circuit comprises a program control power supply, an LED array and a relay group, and is connected with an LED driving module and a control module FPGA.
Specifically, the voltage output end of the programmable power supply is connected to the input end of the relay 3, the output end of the normally open 1 way of the relay 3 is connected to the positive input end of the laser D4, and the output end of the normally open 2 ways of the relay 3 is connected to the negative output end of the laser D4. The negative output end of the laser D4 is connected with the input end of the relay 2, the output end of the normally open circuit 1 way of the relay 2 is connected with the positive input end of the laser D3, and the output end of the normally open circuit 2 way of the relay 2 is connected with the negative output end of the laser D3. The negative output end of the laser D3 is connected with the input end of the relay 1, the output end of the normally open circuit 1 way of the relay 1 is connected with the positive input end of the laser D2, and the output end of the normally open circuit 2 way of the relay 1 is connected with the negative output end of the laser D2. The cathode output end of the laser D2 is connected to the anode input end of the laser D1, and the cathode output end of the laser D1 is connected to the LD driving module and is connected to the drain of the field effect transistor in the LD driving module in fig. 4. The FPGA is connected to the programmable power supply and each relay through a control bus to control the output voltage of the programmable power supply and the on-off circuit selection of each relay.
The programmable power supply has a structure shown in fig. 6, and includes a DC-DC conversion chip, a fixed resistor and a digital potentiometer. The voltage of an external power supply (a battery) is input into a DC-DC conversion chip, the output voltage Vout of the DC-DC conversion chip is divided by a resistor R and a digital potentiometer in series, and the voltage VSNS at the two ends of the digital potentiometer is used as a feedback voltage and input into a feedback voltage input end of the DC-DC chip. The FPGA controls the resistance value of the digital potentiometer through the control bus, so that the voltage VSNS at two ends of the digital potentiometer is controlled, and the output voltage Vout of the DC-DC chip is controlled.
The LED power control module is controlled as follows: when only one LED works, the FPGA controls the program-controlled power supply to enable the output voltage of the power supply to be the rated working voltage of one LED, the FPGA controls the input of the relay 1, the relay 2 and the relay 3 to be conducted with the relay output circuit 2, and at the moment, the LED1 works independently; when the two LEDs work, the FPGA controls the program-controlled power supply to enable the output voltage of the power supply to be the sum of rated working voltages of the two LEDs, the FPGA controls the input of the relay 1 to be conducted with the relay output circuit 1, the inputs of the relay 2 and the relay 3 to be conducted with the relay output circuit 2, and at the moment, the LED1 and the LED2 work simultaneously; when the three LEDs work, the FPGA controls the program-controlled power supply to enable the output voltage of the power supply to be the sum of rated working voltages of the three LEDs, the FPGA controls the input of the relay 1 and the relay 2 to be conducted with the relay output circuit 1, the input of the relay 3 to be conducted with the relay output circuit 2, and at the moment, the LED1, the LED2 and the LED3 work simultaneously; when the four LEDs work, the FPGA controls the programmable power supply to enable the output voltage of the power supply to be the sum of rated working voltages of the four LDs, the FPGA controls the input of the relay 1, the relay 2 and the relay 3 to be conducted with the relay output circuit 1, and at the moment, the LED1, the LED2, the LED3 and the LED4 work simultaneously; when the number of the working LEDs needs to be changed, firstly, the program control power supply is adjusted to enable the output voltage of the power supply to be matched with the changed load output voltage, and then the FPGA controls the relay to adjust the number of the working LEDs.
The LED array uses an LED with the output light power of 1W in common commercial use, the response speed is in nanosecond level, the normal brightness can be achieved when the LED array is electrified, and the electro-optic conversion time delay can be ignored for electric signals with the frequency below 2 MHz. The array is an annular array formed by 8 LED lamp beads, and can provide 8W of output optical power at most.
Further, the LD optical signal transmitting unit includes: the LD driving module is used for receiving a control signal sent by the control unit, conducting a current output loop of the LD driving module according to the control signal and sending the conducting signal to the LD power control module; the LD power control module is used for determining the conduction number of the lasers in the LD array according to the conduction signal and sending the conduction information to the corresponding lasers; the LD array is used for conducting the corresponding laser according to the conducting information; and the optical power beam combiner is used for combining the optical fibers coupled out by the conducted lasers into one optical fiber for output.
In the embodiment of the present invention, as shown in fig. 4, the LD driving module has the same structure as the LED driving module, but the load is replaced by an LD array. The LD power control module also adopts the structure shown in fig. 5, and the control method is the same as that of the LED power control module, which is not described herein again.
The LD array is used for an LD optical signal transmitting end, a laser with the output optical power of 3W is used, the maximum light-on and light-off frequency of 50MHz can be reached, and optical signals are output through optical fiber coupling.
The optical fiber power combiner is a 4 × 1 optical fiber power combiner, optical signals sent by the LD1, the LD2, the LD3 and the LD4 are respectively coupled to 4 input optical fibers of the optical fiber power combiner, the 4 optical signals are superposed into 1 optical signal and output from 1 output optical fiber of the optical fiber power combiner, and the optical signals are transmitted to the space after passing through the transmitting lens.
Further, a control unit comprising: the device comprises a data processor, an MCU control module and an A/DC sampling module. The data processor is used for outputting and receiving signals, outputting two paths of signals to control the LED driving module and the LD driving module, and controlling the on-off of each relay in the power control module; and converting the received electric signals into digital signals, and analyzing and processing data frames in the module to acquire service data and communication state information. The types of data frames include three types: the system comprises a data frame, a synchronous frame and a link state frame, wherein the data frame bears service data; the synchronous frame does not carry service data and is used for establishing communication links of two sides of equipment and extracting a bit synchronous clock; the link state frame carries the optical power and other parameters received by the transmitting device. And the MCU control module is used for controlling the light source working mode and power of the data processor, receiving the light intensity signal from the A/D sampling module for real-time processing calculation, and indicating the data processor to send a power frame. The A/DC sampling module is used for carrying out high-precision acquisition on the amplified electric signal, transmitting the acquired signal to the MCU and feeding back the current received optical power condition.
In the embodiment of the present invention, the signal transmission process of the signal transmission device is as follows: the data processing module FPGA arranges the data to be sent into a bit stream; when the working mode is the mode 1, the FPGA outputs the signal code elements from the ports connected with the LED driving module in sequence according to a certain code element rate; the LED driving module converts the input signal into an LED driving signal with unchanged waveform and frequency and stronger driving capability, and inputs the LED driving signal into the LED power control module; the LED power control module determines the number of lasers driven by the input signal according to the selected gear, and the LED array converts the input driving electric signal into an optical signal with alternating on and off and sends the optical signal to the space; when the working mode is the mode 2, the FPGA outputs the signal code elements from the port connected with the LD driving module in sequence according to a certain code element rate; the LD driving module converts the input signal into an LED driving signal with unchanged waveform and frequency and stronger driving capacity, and inputs the LED driving signal into the LD power control module; the LD power control module determines the number of lasers driven by the input signal according to the selected gear, and the corresponding lasers convert the input driving signal into optical signals and output the optical signals to the optical fiber power combiner through respective coupled optical fibers; the optical fiber power beam combiner combines the input optical signals into an optical signal with power equal to the sum of the respective powers and outputs the optical signal; when the working mode is the mode 3, the FPGA outputs the signal code elements from the port connected with the LED driving module and the port connected with the LD driving module in sequence according to a certain code element rate; the signal input into the LED driving module is converted into an optical signal sent to the space through the LED driving module, the LED power control module and the LED array in sequence; the signal input into the LD driving module is converted into an optical signal sent to the space through the LD driving module, the LD power control module and the optical fiber beam combiner in sequence.
Further, the signal receiving process of the signal transmitting device is as follows: the PMT converts the received space optical signal into a current signal and inputs the current signal into the trans-impedance amplifier; the trans-impedance amplifier converts an input current signal into a voltage signal and inputs the voltage signal into the amplifier; the amplifier amplifies the voltage of the input electric signal and inputs the amplified electric signal into the comparator; the comparator shapes the input voltage signal and inputs the shaped voltage signal to an FPGA receiving port; the FPGA converts the received signal into a bit stream, and performs data reconstruction and further processing on the data internally.
The present invention provides a signal transmitting apparatus, comprising: the LED light signal emitting device comprises an LED light signal emitting unit, an LD light signal emitting unit and a control unit, wherein the LED light signal emitting unit is used for emitting an LED light signal; the LD optical signal transmitting unit is used for transmitting an LD optical signal; the control unit is used for controlling the LED light signal transmitting unit and/or the LD light signal transmitting unit to work. Meanwhile, the LED and the LD are carried as signal light sources, so that the LED and the LD can be more flexibly applied to various working scenes, and the scenes requiring large signal coverage and the scenes requiring long-distance and high-speed signals can simultaneously appear in the same working scene. The communication device has greater applicability. Meanwhile, the power of the LD and the LED array is controllable, the optimal light source working array and the optimal output power can be selected according to an underwater scene, the power consumption can be reduced, and the service life of a device can be prolonged.
An embodiment of the present invention further provides an optical communication apparatus, as shown in fig. 3, including: transmitting system and receiving system, transmitting system includes: the receiving system of the signal transmitting equipment comprises signal receiving equipment which is arranged corresponding to the signal transmitting equipment.
In one embodiment, the optical signal receiver includes an optical filter, a photodetector, a transimpedance amplifier, an amplifier, and a comparator. The optical filter is arranged in front of the photoelectric detector, the output end of the photoelectric detector is connected with the signal input end of the transimpedance amplifier, the signal output end of the transimpedance amplifier is connected with the signal input end of the amplifier, the output end of the amplifier is connected with the signal input end of the comparator, the signal output end of the comparator is connected with a port 3 of the signal processor FPGA, and the port is arranged as an input port in the FPGA. The optical filter is used for an optical signal receiving end, filters out light waves outside a signal receiving optical band, and has certain noise reduction capability. The photoelectric detector is used for an optical signal receiving end, and the PMT detector is used for converting the received optical signal into a current signal. And the trans-impedance amplifier is used for an optical signal receiving end and is connected behind the PMT to convert a current signal output by the PMT into a voltage signal. And the amplifier is used for an optical signal receiving end and is connected behind the transimpedance amplifier to amplify the voltage signal output by the transimpedance amplifier. And the comparator is used for an optical signal receiving end and is connected behind the amplifier, so that the output signal of the amplifier is restricted to two levels of 3.3V and 0V, and the output signal can be correctly received by the data processor.
The data processing module FPGA generates as a signal, and the internal logic structure of the receiving hub is as shown in fig. 7 and is divided into two parts, namely data stream generation, data stream transmission, data stream reception and data recovery.
The data stream generation and data stream transmission processes are as follows: the external carrier sends data to a network port of a data processor FPGA of the optical communication device through a network cable; the FPGA loads the Ethernet data frame received from the network port into a cache; the FPGA processes data in the data cache, including coding and framing of the data, and then loads a data frame obtained after data processing into a next-level cache; and the FPGA performs parallel-serial conversion on the processed data frames in the cache according to bytes, and sends the data code elements to an FPGA port 1 connected with the LED driving module and an FPGA port 2 connected with the LD driving module according to a certain sending rate.
The data stream receiving and data recovery process comprises the following steps: an FPGA port 3 connected with the optical signal receiver converts the received level signal into a data stream according to a system clock and inputs the data stream into a bit synchronization module in the FPGA; the bit synchronization module extracts a bit synchronization clock from the input data stream by using a phase-locked loop, and inputs the bit synchronization clock and the data stream into the serial-parallel conversion module; the serial-parallel conversion module extracts effective code elements from the data stream according to a bit synchronization clock, each eight code elements form a byte, and the obtained data bytes are input into the frame synchronization module; the frame synchronization module finds out a complete data frame from the input data bytes and loads the complete data frame into a data cache; the data processing module frames the data frames in the data cache, decodes the data frames, recombines the data frames into Ethernet data frames, and loads the obtained Ethernet data frames into a next-level cache; and the data processing module FPGA finally completes the transparent transmission of the Ethernet data frame.
Since the laser LD has a faster response speed than the LED, the LD and the LED use the same color light, and a delay module is added before the port 2 to ensure the synchronization of the light signals emitted from the LD and the LED, and the structure of the delay module is shown in fig. 8. The digital-to-analog converter comprises two counters, two comparators, a D trigger and a plurality of gate circuits.
The work flow of the delay module is as follows: the initial input is low level, the output Q of the trigger is low level, and the output
Figure BDA0003083781080000211
Is at a high level; the input rising edge arrives and becomes high level; the zero clearing control ends of the counter 1 and the counter 2 become high level, and the count value of the counter is cleared; the rising edge of the system clock arrives, the output Q of the trigger is changed into high level, and the output Q is output
Figure BDA0003083781080000212
When the level is changed to low level, the counter 1 is enabled to start counting; the count value of the counter 1 is compared with a set delay time at the comparator 1, where the set delay time is the number of pulses that the system clock passes during the time. When the count value of the counter 1 is greater than or equal to the delay time, the comparator 1 outputs a high level, the counter 2 does not start counting at the moment, the count value is 0, the comparator 2 compares the count value with the set delay time, the delay time is greater than the count value of the counter 2 at the moment, the comparator 2 outputs a high level, and finally the delay module outputs a high level; the input falling edge arrives and becomes low level; the rising edge of the system clock arrives, the output Q of the trigger is changed into low level, and the output Q is output
Figure BDA0003083781080000213
When the current count value is changed to be high level, the counter 2 is enabled, starts counting, the counter 1 is disabled, stops counting, and the current count value is not changed; when the delay time is smaller than the count value of the counter 2, the output of the comparator 2 is at a low level, at this time, the count value of the counter 1 is larger than the delay time, the output of the comparator 1 is at a high level, and finally the output of the delay module is at a low level.
The optical communication device provided by the invention comprises: a transmitting system and a receiving system. Meanwhile, the LED and the LD are carried in the transmitting system to serve as signal light sources, so that the transmitting system can be more flexibly applied to various working scenes, and the optimal light source working array and the optimal output power can be selected according to the underwater scenes, thereby improving the stability of underwater optical communication.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (11)

1. A control method of a signal transmission apparatus, characterized in that the signal transmission apparatus comprises: an LED optical signal transmitting unit and an LD optical signal transmitting unit, the control method of the signal transmitting apparatus including:
monitoring a first signal sampling value received by a signal receiving device, wherein the first signal sampling value is a light power value received by the signal receiving device when an LED light signal transmitting unit and an LD light signal transmitting unit of the signal transmitting device run at full power;
determining the working mode of a transmitting unit of the signal transmitting equipment according to the relation between the first signal sampling value and a first threshold value;
and controlling the signal transmitting equipment to operate according to the working mode of the transmitting unit.
2. The method for controlling a signal transmitting apparatus according to claim 1, wherein the determining the operation mode of the transmitting unit of the signal transmitting apparatus according to the relationship between the first signal sample value and the first threshold value comprises:
judging whether the first signal sampling value is larger than the first threshold value or not;
and when the first signal sampling value is not larger than the first threshold value, determining that the signal transmitting equipment is in a full-power working mode of a multi-transmitting unit.
3. The control method of a signal transmission apparatus according to claim 2,
when the first signal sampling value is larger than the first threshold value, calculating the variance corresponding to the first signal sampling value;
and determining the single transmitting unit working mode of the signal transmitting equipment according to the relation between the variance and a second threshold value.
4. The method for controlling a signal transmitting apparatus according to claim 3, wherein the determining the single-transmitting-unit operation mode of the signal transmitting apparatus according to the relationship between the variance and the second threshold comprises:
judging whether the variance is larger than the second threshold value;
when the variance is larger than the second threshold value, determining that the signal transmitting equipment is in an LED transmitting unit working mode;
when the variance is not larger than the second threshold, acquiring the current communication distance between the signal transmitting equipment and the signal receiving equipment;
and determining the working mode of the single transmitting unit of the signal transmitting equipment according to the communication distance.
5. The method for controlling a signal transmitting apparatus according to claim 4, wherein the determining the single-transmitting-unit operation mode of the signal transmitting apparatus according to the communication distance includes:
judging whether the communication distance is larger than a third threshold value;
when the communication distance is larger than a third threshold value, determining that the signal transmitting equipment is in an LD transmitting unit working mode;
and when the communication distance is not greater than a third threshold value, determining that the signal transmitting equipment is in an LED transmitting unit working mode.
6. The method for controlling a signal transmitting apparatus according to claim 2, wherein when the operating mode of the transmitting unit is a full power operating mode of a single transmitting unit, the method for controlling a signal transmitting apparatus further comprises:
acquiring a second signal sampling value received by signal receiving equipment, wherein the second signal sampling value is a light power value received by the signal receiving equipment when the signal transmitting equipment runs at full power under a full-power working mode of the single transmitting unit;
judging whether the second signal sampling value is smaller than a target optical power value under the current signal transmission bandwidth;
and when the second signal sampling value is not less than the target optical power value, adjusting the transmitting speed of the transmitting unit corresponding to the full-power working mode of the single transmitting unit according to the relation between the second signal sampling value and the target optical power value.
7. The method of controlling a signal transmission apparatus according to claim 6, further comprising:
and when the second signal sampling value is smaller than the target optical power value, reducing the signal transmission rate of the signal transmission equipment.
8. A signal transmitting apparatus, comprising: an LED light signal emitting unit, an LD light signal emitting unit and a control unit, wherein,
the LED optical signal transmitting unit is used for transmitting an LED optical signal;
the LD optical signal transmitting unit is used for transmitting an LD optical signal;
the control unit is used for executing the control method of the signal transmitting device according to any one of claims 1 to 7 to control the LED optical signal transmitting unit and/or the LD optical signal transmitting unit to work.
9. The signal emitting device according to claim 8, wherein the LED light signal emitting unit comprises: an LED driving module, an LED power control module and an LED array, wherein,
the LED driving module is used for receiving the control signal sent by the control unit, conducting a current output loop of the LED driving module according to the control signal and sending a conducting signal to the LED power control module;
the LED power control module is used for determining the conduction number of the lasers in the LED array according to the conduction signal and sending the conduction information to the corresponding lasers;
and the LED array is used for conducting the corresponding laser according to the conducting information.
10. The signal transmission device according to claim 8, wherein the LD optical signal transmission unit includes: an LD driving module, an LD power control module, an LD array and an optical power beam combiner,
the LD driving module is used for receiving the control signal sent by the control unit, conducting a current output loop of the LD driving module according to the control signal and sending a conducting signal to the LD power control module;
the LD power control module is used for determining the conduction number of the lasers in the LD array according to the conduction signal and sending the conduction information to the corresponding lasers;
the LD array is used for conducting the corresponding laser according to the conducting information;
and the optical power beam combiner is used for combining the optical fibers coupled out by the conducted lasers into one optical fiber for output.
11. An optical communication apparatus, comprising: transmitting system and receiving system, transmitting system includes: the signal transmission apparatus according to any one of claims 8 to 10, wherein the reception system includes a signal reception apparatus provided in correspondence with the signal transmission apparatus.
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