CN113965269A - Low-duty-ratio pulse signal transmission device, system and method - Google Patents

Low-duty-ratio pulse signal transmission device, system and method Download PDF

Info

Publication number
CN113965269A
CN113965269A CN202111429448.1A CN202111429448A CN113965269A CN 113965269 A CN113965269 A CN 113965269A CN 202111429448 A CN202111429448 A CN 202111429448A CN 113965269 A CN113965269 A CN 113965269A
Authority
CN
China
Prior art keywords
low
pulse
duty
signal
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111429448.1A
Other languages
Chinese (zh)
Inventor
赵奎
黄凤玲
黄涌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUILIN G-LINK TECHNOLOGY CO LTD
Original Assignee
GUILIN G-LINK TECHNOLOGY CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUILIN G-LINK TECHNOLOGY CO LTD filed Critical GUILIN G-LINK TECHNOLOGY CO LTD
Priority to CN202111429448.1A priority Critical patent/CN113965269A/en
Publication of CN113965269A publication Critical patent/CN113965269A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04B10/508—Pulse generation, e.g. generation of solitons
    • 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
    • H04B10/516—Details of coding or modulation
    • H04B10/524—Pulse modulation
    • 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
    • H04B10/564—Power control
    • 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
    • H04B10/60—Receivers

Landscapes

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

Abstract

The invention provides a transmission device, a system and a method of a low duty ratio pulse signal, wherein the transmission device comprises an optical transmitter and an optical receiver; the optical transmitter is connected with the transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber circuit; the optical transmitter is used for carrying out 'dark pulse' modulation on the low-duty-ratio pulse electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated low-duty-ratio pulse electrical signal to obtain a low-duty-ratio pulse optical signal; the optical receiver is connected with the receiving terminal equipment; the optical receiver performs photoelectric conversion on the low-duty-ratio pulse optical signal transmitted by the optical fiber line to obtain a transmitted low-duty-ratio pulse electrical signal, and transmits the transmitted low-duty-ratio pulse electrical signal to the receiving terminal equipment. The optical transmitter of the invention carries out 'dark pulse' modulation on the time-frequency electric signal sent by the sending terminal equipment, and has the advantages of optical fiber line attenuation change resistance, stable transmission time delay and low cost.

Description

Low-duty-ratio pulse signal transmission device, system and method
Technical Field
The invention relates to the technical field of optical fiber transmission, in particular to a device, a system and a method for transmitting a low-duty-ratio pulse signal.
Background
In many large measurement networks, low duty cycle pulse devices are required for time synchronization, and a central device sends time synchronization pulses or measurement start pulses, typically as transmission Pulse Per Second (PPS) signals, to other end devices. Such transmitted signals are characterized by a very low duty cycle, in some cases a pulse signal with a width of tens of ns is emitted within a time interval of one second, and the duty cycle can be as low as 10E-7. When the optical fiber is used as a transmission medium of a low duty ratio pulse signal, the length of the optical fiber ranges from several meters to tens of kilometers, and the transmission delay of the signal is changed due to the influence of various environmental factors. This solution is suitable when the length of the optical fiber is long, but for the short distance between the equipments, the length of the optical fiber is within thousands of meters, even tens of meters, the above solution is too complex and costly.
Disclosure of Invention
The invention aims to provide a transmission device, a transmission system and a transmission method of a low-duty-ratio pulse signal, which have the advantages of resistance to attenuation change of an optical fiber circuit, stable transmission delay and low cost.
In order to achieve the purpose, the invention provides the following scheme:
a low duty cycle pulse signal transmission apparatus, comprising:
an optical transmitter and an optical receiver;
the optical transmitter is connected with transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber line; the optical transmitter is used for carrying out dark pulse modulation on the low-duty-ratio pulse electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated low-duty-ratio pulse electrical signal to obtain a low-duty-ratio pulse optical signal;
the optical receiver is connected with receiving terminal equipment; and the optical receiver performs photoelectric conversion on the low-duty-ratio pulse optical signal transmitted by the optical fiber line to obtain a transmitted low-duty-ratio pulse electrical signal, and transmits the transmitted low-duty-ratio pulse electrical signal to receiving terminal equipment.
Optionally, the optical transmitter specifically includes:
the device comprises a pulse signal shaping circuit, a laser current driver, a laser, an automatic power controller and a first photoelectric detector;
the input end of the pulse signal shaping circuit is connected with the transmitting terminal equipment; the pulse signal shaping circuit, the laser current driver and the laser are sequentially connected; the output end of the laser is connected with one end of the optical fiber circuit;
the first photoelectric detector is connected with the automatic power controller; the first photoelectric detector is used for detecting a backward optical signal of the laser;
the automatic power controller is used for amplifying the back light signal and controlling the current drive of the laser according to the amplified back light signal to form the closed-loop control of the automatic light power.
Optionally, the optical receiver specifically includes:
the second photoelectric detector, the preamplifier, the controllable gain amplifier, the comparison amplifier and the automatic gain controller;
the input end of the preamplifier is connected with the other end of the optical fiber circuit; the second photoelectric detector, the preamplifier, the controllable gain amplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected with the receiving terminal equipment;
the input end of the automatic gain controller is connected with the output end of the controllable gain amplifier; the output end of the automatic gain controller is connected with the control end of the controllable gain amplifier; the automatic gain controller is used for amplifying the direct current component of the output signal of the controllable gain amplifier and controlling the gain of the controllable gain amplifier according to the amplified direct current component to form automatic gain closed-loop control.
Optionally, the optical receiver further includes:
a filter circuit;
the input end of the filter circuit is connected with the output end of the controllable gain amplifier;
and the output end of the filter circuit is connected with the input end of the automatic gain controller.
A transmission system for low duty cycle pulsed signals, comprising:
a transmitting terminal device, a plurality of transmission devices of the low duty ratio pulse signals, and a plurality of receiving terminal devices;
the transmitting terminal equipment is respectively connected with the plurality of transmission devices; and the plurality of transmission devices and the plurality of receiving terminal devices are respectively connected in a one-to-one correspondence manner.
A transmission method of a low duty cycle pulse signal is applied to the transmission device of the low duty cycle pulse signal, and the transmission method comprises the following steps:
the optical transmitter carries out 'dark pulse' modulation on the low-duty-ratio pulse electrical signal sent by the sending terminal equipment, and carries out electro-optic conversion on the modulated low-duty-ratio pulse electrical signal to obtain a low-duty-ratio pulse optical signal;
the optical fiber line transmits the low-duty-cycle pulse optical signal;
the optical receiver performs photoelectric conversion on the low-duty-ratio pulse optical signal transmitted by the optical fiber line to obtain a transmitted low-duty-ratio pulse electrical signal;
and the receiving terminal equipment receives the transmitted low-duty-ratio pulse electric signal.
Optionally, the optical transmitter performs "dark pulse" modulation on the low duty cycle pulse electrical signal sent by the sending terminal device, and performs electro-optical conversion on the modulated low duty cycle pulse electrical signal to obtain a low duty cycle pulse optical signal, which specifically includes:
carrying out 'dark pulse' modulation on the low-duty-ratio pulse electric signal sent by the sending terminal equipment;
a first photodetector detects a back-facing light signal at the laser;
and the automatic power controller amplifies the back light signal and controls the current drive of the laser according to the amplified back light signal, so that the pulse amplitude of the low-duty-ratio pulse light signal output by the laser is kept within a preset pulse amplitude range.
Optionally, the optical receiver performs photoelectric conversion on the low-duty-cycle pulse optical signal transmitted through the optical fiber line to obtain a transmitted low-duty-cycle pulse electrical signal, and the method specifically includes:
the automatic gain controller acquires a direct current component of a low-duty-ratio pulse light signal transmitted by the optical fiber line;
the automatic gain controller amplifies the direct current component;
the automatic gain controller controls the gain of the controllable gain amplifier according to the amplified direct current component, so that the ratio of the amplitude level of the signal input to the comparison amplifier to the comparison threshold level of the comparison amplifier is kept within a preset ratio range.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a transmission device, a system and a method of a low duty ratio pulse signal, wherein the transmission device comprises an optical transmitter and an optical receiver; the optical transmitter is connected with the transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber circuit; the optical transmitter is used for carrying out 'dark pulse' modulation on the low-duty-ratio pulse electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated low-duty-ratio pulse electrical signal to obtain a low-duty-ratio pulse optical signal; the optical receiver is connected with the receiving terminal equipment; the optical receiver performs photoelectric conversion on the low-duty-ratio pulse optical signal transmitted by the optical fiber line to obtain a transmitted low-duty-ratio pulse electrical signal, and transmits the transmitted low-duty-ratio pulse electrical signal to the receiving terminal equipment. The optical transmitter of the invention carries out 'dark pulse' modulation on the time-frequency electric signal sent by the sending terminal equipment, and has the advantages of optical fiber line attenuation change resistance, stable transmission time delay and low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a transmission apparatus for modulating a low duty cycle pulse signal by "bright pulses" in the prior art;
fig. 2 is a schematic diagram illustrating a change in amplitude of a pulse signal output by a transmission device for modulating a low-duty-ratio pulse signal by a "bright pulse" in the prior art when the attenuation of an optical fiber changes;
fig. 3 is a schematic diagram illustrating a change of an amplitude of a pulse signal output by a transmission device for modulating a low-duty-ratio pulse signal by a "bright pulse" in the prior art after an optical fiber attenuation is increased by 5 dB;
FIG. 4 is a schematic structural diagram of a transmission apparatus for modulating a low duty cycle pulse signal by a "dark pulse" according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for transmitting a low duty cycle pulse signal according to an embodiment of the present invention;
description of the drawings: 1-a pulse signal shaping circuit; 2-laser current driver; 3-a laser; 4-an automatic power controller; 5-a first photodetector; 6-a second photodetector; 7-a preamplifier; 8-a controllable gain amplifier; 9-comparison amplifier 10 automatic gain controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The invention aims to provide a transmission device, a transmission system and a transmission method of a low-duty-ratio pulse signal, which have the advantages of resistance to attenuation change of an optical fiber circuit, stable transmission delay and low cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
FIG. 4 is a schematic structural diagram of a transmission apparatus for modulating a low duty cycle pulse signal by a "dark pulse" according to an embodiment of the present invention; as shown in fig. 4, the present invention provides a transmission apparatus for a low duty ratio pulse signal, including:
an optical transmitter and an optical receiver;
the optical transmitter is connected with the transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber circuit; the optical transmitter is used for carrying out 'dark pulse' modulation on the low-duty-ratio pulse electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated low-duty-ratio pulse electrical signal to obtain a low-duty-ratio pulse optical signal;
the optical receiver is connected with the receiving terminal equipment; the optical receiver performs photoelectric conversion on the low-duty-ratio pulse optical signal transmitted by the optical fiber line to obtain a transmitted low-duty-ratio pulse electrical signal, and transmits the transmitted low-duty-ratio pulse electrical signal to the receiving terminal equipment.
Wherein, the optical transmitter specifically includes:
the device comprises a pulse signal shaping circuit 1, a laser current driver 2, a laser 3, an automatic power controller 4 and a first photoelectric detector 5;
the input end of the pulse signal shaping circuit is connected with the transmitting terminal equipment; the pulse signal shaping circuit, the laser current driver and the laser are sequentially connected; the output end of the laser is connected with one end of the optical fiber circuit;
the first photoelectric detector is connected with the automatic power controller; the first photoelectric detector is used for detecting a backward optical signal of the laser;
the automatic power controller is used for amplifying the back light signal and controlling the current drive of the laser according to the amplified back light signal to form the closed-loop control of the automatic light power.
The optical receiver specifically includes:
a second photoelectric detector 6, a preamplifier 7, a controllable gain amplifier 8, a comparison amplifier 9 and an automatic gain controller 10;
the input end of the preamplifier is connected with the other end of the optical fiber circuit; the second photoelectric detector, the preamplifier, the controllable gain amplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected with the receiving terminal equipment;
the input end of the automatic gain controller is connected with the output end of the controllable gain amplifier; the output end of the automatic gain controller is connected with the control end of the controllable gain amplifier; the automatic gain controller is used for amplifying the direct current component of the output signal of the controllable gain amplifier and controlling the gain of the controllable gain amplifier according to the amplified direct current component to form automatic gain closed-loop control.
Further, the optical receiver further includes:
a filter circuit (not shown herein);
the input end of the filter circuit is connected with the output end of the controllable gain amplifier;
the output end of the filter circuit is connected with the input end of the automatic gain controller.
As shown in fig. 1, the current pulse optical fiber transceiver solution includes two parts: the pulse signal shaping circuit and the laser current driving circuit form an optical transmitter; the optical receiver is composed of a preamplifier and a comparison amplifier. The optical transmitter completes the electric-optical conversion, and the optical receiver completes the optical-electric conversion and the pulse regeneration.
In the current optical fiber transceiver technical scheme, an optical signal modulation mode of a "bright pulse" mode is adopted, that is: when the pulse occurs, the logic signal is corresponding to '1', and the logic signal is corresponding to 'high optical power level'; when no pulse occurs, a "0" logic signal corresponds to a "no light power level or an extremely low light power level". In an optical transmitter, when a pulse signal-1 signal appears at an input end, a pulse signal shaping circuit generates the 1 signal, so that a laser current driving circuit generates current to drive a laser to emit light and generate an optical pulse signal corresponding to the pulse signal; when the input end does not generate a pulse signal, namely a '0' signal, the pulse signal shaping circuit generates a '0' signal, so that the laser current driving circuit does not output current to drive the laser, the laser does not emit light, and the output light power is 0 or extremely low light power level.
The optical pulse optical signal is transmitted to a photoelectric detector in the optical-electric conversion through an optical fiber to be converted into light current, the light current is amplified by a preamplifier, the obtained pulse signal Vp is regenerated by a comparison amplifier circuit, and finally regenerated pulse output is obtained.
In the above process, the optical pulse signal modulated in the "bright pulse" manner is used, and when the pulse duty ratio is low, it is inconvenient to detect the pulse amplitude level in the output optical signal in the optical transmitter to implement the automatic optical power control; in an optical receiver, it is not convenient either to implement automatic gain control to control pulse amplitude stability or to detect well the pulse amplitude level to automatically adjust the comparison threshold level of the comparison amplifier. Therefore, when the pulse is regenerated, the comparison amplifier can only perform comparison amplification by using a fixed comparison threshold level to regenerate the pulse signal, as shown in fig. 2 and 3.
Compare threshold level V, FIG. 2thTaking a fixed value, e.g. pulse signal V p1/6 of (1). When the attenuation of the optical fiber changes, the amplitude of the pulse signal output by the preamplifier changes correspondingly, and as in the example of fig. 3, after the attenuation of the optical fiber is increased by 5dB, the amplitude of the pulse signal changes from VpIs reduced to V'p，V'p＝Vp/3. Due to comparison of threshold levels VthThe time position of the rising edge of the regenerated pulse signal obtained by the comparison amplifier is changed by a fixed value, the change is delta t, the magnitude of delta t is equal to the change of the amplitude of the pulse signal, and the rising edge rate of the pulse signalIt is related. When the variation of the amplitude of the pulse signal is large, for example, 10dB, the rising edge rate of the pulse signal is low, for example, 1ns, and in the above example, the value of Δ t can reach more than 600 ps. In some applications, transmission delay variations of hundreds of ps exceed the tolerance.
As shown in fig. 4, the optical fiber transceiver of the present invention includes two parts: an optical transmitter and an optical receiver. The optical transmitter performs the electrical-to-optical conversion, and the optical receiver performs the optical-to-electrical conversion and the pulse regeneration.
The optical transmitter includes: pulse signal shaping, laser current driving, automatic power control, a laser and a first photoelectric detector; the pulse signal shaping, the laser current driving and the laser are sequentially connected, the first photoelectric detector detects a backward light signal of the laser, and the backward light signal is amplified by the automatic power control circuit and then controls the laser current driving circuit to form automatic light power control.
The optical receiver includes: the second photoelectric detector, the preamplifier, the controllable gain amplifier, the comparison amplifier and the automatic gain control; the second photoelectric detector, the preamplifier, the controllable gain amplifier and the comparison amplifier are sequentially connected, the automatic gain control circuit filters an output signal of the controllable gain amplifier, amplifies an obtained direct-current component signal and outputs the amplified direct-current component signal to a gain control input end of the controllable gain amplifier to form automatic gain closed-loop control, the output signal of the controllable gain amplifier is stable and unchanged, and the comparison amplifier performs pulse regeneration by adopting a fixed comparison threshold value.
In the device, a light signal modulation mode of a 'dark pulse' mode is adopted, a pulse signal appears, corresponds to a '1' logic signal and corresponds to 'no light power level or extremely low light power level'; no pulse signal is present, corresponding to a "0" logic signal, corresponding to a "high optical power level". When a pulse signal-1 signal appears at the input end, the pulse signal shaping circuit generates a 1 signal, the laser current driving circuit does not generate current to drive the laser, the laser does not emit light or only emits light with low power, and the output light power is 0 or extremely low light power level; when the input end does not have a pulse signal, namely a '0' signal, the pulse signal shaping circuit generates a '0' signal, the laser current driving circuit outputs current to drive the laser to emit light, and the output light power is high light power.
After the optical signal modulation mode of the 'dark pulse' mode is adopted, the pulse duty ratio is very low and is lower than 10E-3At the end of the optical transmitter, the optical signal output by the optical transmitter is a high-power optical signal similar to direct current in most of time; when a pulse signal is present, the optical transmitter outputs an optical power at a lower value, such as less than-30 dBm. Thus, it is easy to adopt the back-light signal DC signal amplifying circuit to form the automatic optical power control circuit, so that the average optical power level of the optical signal outputted by the optical transmitter tends to a stable value, such as 0dBm, and the amplitude level value of the optical pulse signal is also approximately equal to the average power level value of the optical signal. Since the amplitude level of the optical pulse is approximately equal to the average output optical power of the laser, the amplitude of the pulse signal in the optical signal can be stabilized by controlling the average output optical power of the optical transmitter to be stable.
After the optical signal modulation mode of the "dark pulse" mode is adopted, in the embodiment, a preamplifier and a controllable gain amplifier in the optical receiver simultaneously amplify a direct current signal and a pulse signal contained in the optical signal, the level of the pulse signal is approximately equal to the level of the direct current signal, and the amplitude level of the pulse signal is obtained by detecting the direct current level of the received optical signal; the automatic gain control circuit filters the output signal of the controllable gain amplifier and amplifies the obtained direct current component signal, then the signal is output to the gain control input end of the controllable gain amplifier to form automatic gain closed-loop control, so that the output signal of the controllable gain amplifier is stable and unchanged, even if the comparison amplifier uses a fixed comparison threshold, the ratio of the amplitude level of the pulse input signal to the comparison threshold level can still be kept almost unchanged, the rising edge time position of the regenerated pulse signal regenerated by the comparison amplifier does not change along with the change of the input pulse signal level, the influence of the amplitude level change of the pulse input signal on the transmission delay is greatly weakened, even if a device with lower speed and smaller bandwidth is adopted, when the loss of the optical fiber line changes, the transmission delay can be ensured to be hardly changed along with the change of the loss of the optical fiber line.
In addition, the present invention also provides a transmission system of a low duty ratio pulse signal, the transmission system comprising:
a transmitting terminal device, a plurality of transmission devices of the low duty ratio pulse signals, and a plurality of receiving terminal devices;
the transmitting terminal equipment is respectively connected with a plurality of transmission devices; the plurality of transmission devices and the plurality of receiving terminal devices are respectively connected in a one-to-one correspondence manner.
As shown in fig. 5, the present invention further provides a transmission method of a low duty ratio pulse signal, where the transmission method is applied to the transmission apparatus of the low duty ratio pulse signal, and the transmission method includes:
step 501: the optical transmitter carries out 'dark pulse' modulation on the low-duty-ratio pulse electrical signal sent by the sending terminal equipment, and carries out electro-optic conversion on the modulated low-duty-ratio pulse electrical signal to obtain a low-duty-ratio pulse optical signal;
step 502: the optical fiber line transmits low duty ratio pulse optical signals;
step 503: the optical receiver performs photoelectric conversion on the low-duty-ratio pulse optical signal transmitted by the optical fiber line to obtain a transmitted low-duty-ratio pulse electrical signal;
step 504: and the receiving terminal equipment receives the transmitted low-duty-ratio pulse electric signal.
Step 501, specifically including:
carrying out 'dark pulse' modulation on the low-duty-ratio pulse electric signal sent by the sending terminal equipment;
a first photodetector detects a back-facing light signal at the laser;
the automatic power controller amplifies the back light signal and controls the current drive of the laser according to the amplified back light signal, so that the pulse amplitude of the low-duty-ratio pulse light signal output by the laser is kept within a preset pulse amplitude range.
Step 503 specifically includes:
the automatic gain controller acquires a direct current component of a low-duty-ratio pulse light signal transmitted by an optical fiber line;
the automatic gain controller amplifies the direct current component;
the automatic gain controller controls the gain of the controllable gain amplifier according to the amplified direct current component, so that the ratio of the amplitude level of the signal input to the comparison amplifier to the comparison threshold level of the comparison amplifier is kept within a preset ratio range.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. A transmission apparatus for low duty cycle pulse signals, the transmission apparatus comprising:
an optical transmitter and an optical receiver;
the optical transmitter is connected with transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber line; the optical transmitter is used for carrying out dark pulse modulation on the low-duty-ratio pulse electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated low-duty-ratio pulse electrical signal to obtain a low-duty-ratio pulse optical signal;
the optical receiver is connected with receiving terminal equipment; and the optical receiver performs photoelectric conversion on the low-duty-ratio pulse optical signal transmitted by the optical fiber line to obtain a transmitted low-duty-ratio pulse electrical signal, and transmits the transmitted low-duty-ratio pulse electrical signal to receiving terminal equipment.
2. The apparatus for transmitting a low duty cycle pulse signal according to claim 1, wherein the optical transmitter specifically comprises:
the device comprises a pulse signal shaping circuit, a laser current driver, a laser, an automatic power controller and a first photoelectric detector;
the input end of the pulse signal shaping circuit is connected with the transmitting terminal equipment; the pulse signal shaping circuit, the laser current driver and the laser are sequentially connected; the output end of the laser is connected with one end of the optical fiber circuit;
the first photoelectric detector is connected with the automatic power controller; the first photoelectric detector is used for detecting a backward optical signal of the laser;
the automatic power controller is used for amplifying the back light signal and controlling the current drive of the laser according to the amplified back light signal to form the closed-loop control of the automatic light power.
3. The apparatus for transmitting a low duty cycle pulse signal according to claim 2, wherein the optical receiver specifically comprises:
the second photoelectric detector, the preamplifier, the controllable gain amplifier, the comparison amplifier and the automatic gain controller;
the input end of the preamplifier is connected with the other end of the optical fiber circuit; the second photoelectric detector, the preamplifier, the controllable gain amplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected with the receiving terminal equipment;
the input end of the automatic gain controller is connected with the output end of the controllable gain amplifier; the output end of the automatic gain controller is connected with the control end of the controllable gain amplifier; the automatic gain controller is used for amplifying the direct current component of the output signal of the controllable gain amplifier and controlling the gain of the controllable gain amplifier according to the amplified direct current component to form automatic gain closed-loop control.
4. The apparatus for transmitting a low duty cycle pulse signal according to claim 3, wherein said optical receiver further comprises:
a filter circuit;
the input end of the filter circuit is connected with the output end of the controllable gain amplifier;
and the output end of the filter circuit is connected with the input end of the automatic gain controller.
5. A transmission system for low duty cycle pulse signals, the transmission system comprising:
a transmitting terminal device, a plurality of transmission devices of low duty cycle pulse signals according to any one of claims 1 to 4, and a plurality of receiving terminal devices;
the transmitting terminal equipment is respectively connected with the plurality of transmission devices; and the plurality of transmission devices and the plurality of receiving terminal devices are respectively connected in a one-to-one correspondence manner.
6. A transmission method of a low duty cycle pulse signal, wherein the transmission method is applied to a transmission device of a low duty cycle pulse signal according to any one of claims 1 to 4, and the transmission method comprises:
the optical transmitter carries out 'dark pulse' modulation on the low-duty-ratio pulse electrical signal sent by the sending terminal equipment, and carries out electro-optic conversion on the modulated low-duty-ratio pulse electrical signal to obtain a low-duty-ratio pulse optical signal;
the optical fiber line transmits the low-duty-cycle pulse optical signal;
the optical receiver performs photoelectric conversion on the low-duty-ratio pulse optical signal transmitted by the optical fiber line to obtain a transmitted low-duty-ratio pulse electrical signal;
and the receiving terminal equipment receives the transmitted low-duty-ratio pulse electric signal.
7. The method according to claim 6, wherein the optical transmitter performs "dark pulse" modulation on the low duty ratio pulse electrical signal sent by the sending terminal device, and performs electro-optical conversion on the modulated low duty ratio pulse electrical signal to obtain a low duty ratio pulse optical signal, and specifically comprises:
carrying out 'dark pulse' modulation on the low-duty-ratio pulse electric signal sent by the sending terminal equipment;
a first photodetector detects a back-facing light signal at the laser;
and the automatic power controller amplifies the back light signal and controls the current drive of the laser according to the amplified back light signal, so that the pulse amplitude of the low-duty-ratio pulse light signal output by the laser is kept within a preset pulse amplitude range.
8. The method according to claim 7, wherein the optical receiver performs photoelectric conversion on the low-duty-cycle pulse optical signal transmitted through the optical fiber line to obtain a transmitted low-duty-cycle pulse electrical signal, and specifically comprises:
the automatic gain controller acquires a direct current component of a low-duty-ratio pulse light signal transmitted by the optical fiber line;
the automatic gain controller amplifies the direct current component;
the automatic gain controller controls the gain of the controllable gain amplifier according to the amplified direct current component, so that the ratio of the amplitude level of the signal input to the comparison amplifier to the comparison threshold level of the comparison amplifier is kept within a preset ratio range.
CN202111429448.1A 2021-11-29 2021-11-29 Low-duty-ratio pulse signal transmission device, system and method Pending CN113965269A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111429448.1A CN113965269A (en) 2021-11-29 2021-11-29 Low-duty-ratio pulse signal transmission device, system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111429448.1A CN113965269A (en) 2021-11-29 2021-11-29 Low-duty-ratio pulse signal transmission device, system and method

Publications (1)

Publication Number Publication Date
CN113965269A true CN113965269A (en) 2022-01-21

Family

ID=79472330

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111429448.1A Pending CN113965269A (en) 2021-11-29 2021-11-29 Low-duty-ratio pulse signal transmission device, system and method

Country Status (1)

Country Link
CN (1) CN113965269A (en)

Similar Documents

Publication Publication Date Title
US10644807B2 (en) Optical receiver, active optical cable, and control method for optical receiver
US8200100B2 (en) Systems and methods for diagnostic monitoring of optical modulation amplitude at an optical receiver using automatic gain control
US8054136B2 (en) Electronic circuit
CN107517080B (en) Optical power detection method, device, equipment and optical module
US20020027689A1 (en) Fiber optic transceiver employing front end level control
US20020149824A1 (en) Synchronization of an optical pulse stream with an electrical signal
CN102045599A (en) Optical signal transmission method, device and system of passive optical network
EP1289175B1 (en) Control circuit for controlling the extinction ratio of a semiconductor laser
CN113965268A (en) Time-frequency signal transmission device, system and method
CN216490514U (en) Low duty cycle pulse signal transmission device and system
CN104579493A (en) Optical transceiver module with digital adjustable SBS suppression function
CN216490512U (en) Optical fiber transceiver and pulse signal transceiving system
CN216490513U (en) Time-frequency signal transmission device and system
CN113965269A (en) Low-duty-ratio pulse signal transmission device, system and method
JP2005244987A (en) Optical communication method and device
EP1357685A2 (en) Burst-mode optical receiver
CN113972954A (en) Optical fiber transceiver, pulse signal transceiving system and method
US6912085B2 (en) Optical amplifier
WO2014177665A1 (en) Circuit arrangement and method for receiving optical signals
JP2894436B2 (en) Optical transmitter
JP2002350791A (en) Light power equalizing device
CN217276797U (en) Optical fiber time delay measuring device
CN109995525B (en) Signal transmission method, device and system for quantum key distribution system
CN1316767C (en) Method for reducing Brillonin scattering effect influence excited in optical transmission system
JP2536178B2 (en) Optical transceiver

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination