CN110429984A - One kind simulating optical communication system for time division duplex - Google Patents
One kind simulating optical communication system for time division duplex Download PDFInfo
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- CN110429984A CN110429984A CN201910871561.1A CN201910871561A CN110429984A CN 110429984 A CN110429984 A CN 110429984A CN 201910871561 A CN201910871561 A CN 201910871561A CN 110429984 A CN110429984 A CN 110429984A
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
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Abstract
The invention discloses one kind to simulate optical communication system, including proximal end optical module, the distal end optical module being used cooperatively with proximal end optical module for time division duplex；It is equipped with proximal end bias switching circuit in the optical module of proximal end, distal end bias switching circuit is equipped in the optical module of distal end；The proximal end bias switching circuit generates voltage control signal control remote switch and downlink or uplink link is connected by detection input signal, while controlling proximal end laser and generating optical signal；The distal end bias switching circuit is by detecting whether distal end detector receives optical signal, to generate the conducting downlink or uplink link of voltage signal control far-end switch, and it controls distal end laser and generates optical signal, by the mutual cooperation of proximal end bias switching circuit and distal end bias switching circuit, signal uplink or downlink are realized.The present invention improves the isolation in optical communication system between uplink downlink, increases the reliability of distant-end node.
Description
Technical field
The present invention relates to network communication technology fields, more particularly to a kind of be used for time division duplex simulated light communication system
System.
Background technique
In time division duplex simulation optical communication system, uplink downlink work is in same frequency, when different by distributing
Gap carries out transmitting-receiving operation.If the isolation between uplink downlink is inadequate, uplink and downlink loop easy to form,
The signal in uplink (or downlink) link is caused to come back to uplink (or downlink) link by loop, thus in former link
Signal interferes.
Existing time division duplex simulation optical communication system generallys use integrated single-pole double-throw switch (SPDT) or passive ferrite core
Row device carries out the switch operating of receiving and transmitting signal, while realizing the isolation of uplink and downlink signals access.The former needs additional control circuit
Judge the up-downlink direction of signal, increases the complexity of far-end unit structure, and can increase according to high isolation switch
Adding system cost；Latter circuit is simple, but it has the shortcomings that isolation is low, volume is big, price is high.It declines in addition, additionally introducing
Subtract the isolation that device and amplifier also be used to improve link, which increases the complexity and cost of circuit, reduces remote
The reliability of end unit.
The isolation in time division duplex simulation optical communication system between uplink downlink how is improved, while being further increased remote
The problem of reliability of end node and the maintenance difficulties for reducing far-end unit, and reduction system cost are urgent need to resolve.
Summary of the invention
The present invention in order to solve isolation in existing time division duplex simulation optical communication system between uplink downlink it is low with
And the problem that maintenance difficulties are big, one kind is provided for time division duplex and simulates optical communication system, can improve time division duplex simulation
Isolation in optical communication system between uplink downlink improves the reliability of distant-end node and reduces the Maintenance Difficulty of far-end unit
Degree.
To realize aforementioned present invention purpose, the technical solution adopted is as follows: a kind of be used for time division duplex simulated light communication system
System, including proximal end optical module, the distal end optical module being used cooperatively with proximal end optical module；The proximal end optical module includes proximal end biasing
Switching circuit, uplink and downlink signals distribution remote switch, the proximal end laser for carrying out electro-optic conversion, for carry out photoelectricity turn
The proximal detector changed；The control terminal of the proximal end bias switching circuit respectively with the control terminal of remote switch, proximal end laser
Control terminal connection；The proximal end bias switching circuit is swashed with the output end of proximal detector, proximal end respectively by remote switch
The input terminal of light device connects；The distal end optical module includes distal end laser, distal end bias switching circuit, distal end detector, remote
End switch；The distal end bias switching circuit is connect with distal end laser, distal end detector, far-end switch respectively；The distal end
External antenna is switched, the signal that detector reception proximal end laser in distal end sends over is sent by external antenna, together
When far-end switch the signal of receiving antenna is transferred to proximal detector by distal end laser；The proximal end bias switching circuit
By detecting input signal, generates voltage control signal control remote switch and downlink or uplink link is connected, while controlling proximal end
Laser generates optical signal；Whether the distal end bias switching circuit receives optical signal by detection distal end detector, thus
The conducting downlink or uplink link of voltage signal control far-end switch is generated, and controls distal end laser and generates optical signal, is passed through
Signal uplink or downlink are realized in the mutual cooperation of proximal end bias switching circuit and distal end bias switching circuit.
Preferably, the proximal end bias switching circuit includes wave detector module, Coupler Module, comparator module, proximal end
Voltage follower circuit module, remote switch circuit module；
The Coupler Module, wave detector module, comparator module, proximal end voltage follower circuit module, remote switch electricity
Road module is sequentially connected；
The Coupler Module, the radiofrequency signal for that will input carry out branch, are exported by the straight-through end of Coupler Module
Signal be loaded directly into remote switch, the coupled end output signal of the Coupler Module is used for voltage detecting；
The wave detector module, for the coupler coupled end output signal carry out detection, by the signal from
Ac signal is converted to DC signal；
The comparator sets voltage in the voltage swing and comparator of the DC signal for exporting the wave detector
It is compared, generates detection signal, by the control terminal of obtained detection signal input remote switch, control the logical of remote switch
It is disconnected；
The input terminal of the proximal end voltage follower circuit module and the output end of comparator connect, proximal end voltage follower circuit
The output end of module is connect with the input terminal of remote switch circuit module；
The output end of the remote switch circuit module is connect with the control terminal of proximal end laser.
Remote switch of the present invention uses RF switch；The common radio-frequency end of the remote switch and proximal end biased witch
Circuit connection；One radio-frequency head of the remote switch and the output end of proximal detector connect, and another of remote switch is penetrated
Frequency end is connect with the input terminal of proximal end laser.Proximal end bias switching circuit of the present invention is used to control the logical of remote switch
Disconnected, proximal end laser working condition, realizes the downlink or uplink of control radiofrequency signal.
Further, the Coupler Module includes coupler, resistance R1；
The input terminal of the coupler is used for input radio frequency signal；
The straight-through end of the coupler is electrically connected with the common radio-frequency end of remote switch；
The coupled end of the coupler is electrically connected with the input terminal of wave detector module；
The isolation end of the coupler is grounded by resistance R1.
Still further, the wave detector module includes capacitor C8, resistance R2, capacitor C9, wave detector；
The RF pin of the wave detector is connected by the coupled end of capacitor C8 and coupler；
The Vout pin of the wave detector is connected by resistance R2 and the input terminal of comparator module；
Between an end Jie resistance R2 and comparator of the capacitor C9, the other end of the capacitor C9 is grounded；
The EN pin of the wave detector connects+5V power supply.
Still further, the comparator module includes comparator, resistance R3, resistance R4；
The Vin- pin of the comparator is connected by the Vout pin of resistance R2 and wave detector；
The V+ pin of the comparator connects+5V power supply；
The V- pin of the comparator is grounded；
The Vin+ of the comparator is connect with one end of one end of resistance R4, resistance R3 respectively；The resistance R4's is another
Termination+5V power supply, the other end ground connection of the resistance R3；
The input with the control terminal of remote switch, proximal end voltage follower circuit module respectively of the Vout pin of the comparator
End connection.
Still further, the proximal end voltage follower circuit module includes resistance R5, potentiometer TV1, the first operation amplifier
Device, resistance R6；
The Vout pin of a termination comparator of the resistance R5, the mobile terminal of another termination potentiometer TV1 of resistance R5
Connection；
A fixing end of the potentiometer TV1 is connect with the mobile terminal of position device TV1, and anti-with the first operational amplifier
The connection of phase input terminal；Another fixing end of the potentiometer TV1 is grounded；
The non-inverting input terminal of first operational amplifier is electrically connected with remote switch circuit module；
The output end of first operational amplifier is electrically connected by resistance R6 with remote switch circuit module.
Still further, the remote switch circuit module includes triode Q1, resistance R7, resistance R8, inductance L1, resistance
R0；
The base stage of the triode Q1 is connect with one end of resistance R6；The emitter of the triode Q1 is connect by resistance R7
Ground, while the emitter of triode Q1 is connect with the non-inverting input terminal of the first operational amplifier；
The collector of the triode Q1 passes sequentially through the control terminal of resistance R8, inductance L1, resistance R0 and proximal end laser
Connection.
Preferably, the distal end bias switching circuit include far-end switch circuit module, distal end voltage follower circuit module,
Voltage conversion circuit；
It is the distal end detector, voltage conversion circuit, distal end voltage follower circuit module, far-end switch circuit module, remote
End laser is sequentially connected electrically, meanwhile, the output end of the voltage conversion circuit and the control terminal of far-end switch connect；The electricity
Voltage conversion circuit is used to the photoelectric current generated on the detector of distal end being converted into voltage signal.
Distal end bias switching circuit of the present invention, distal end detector, far-end switch, distal end laser constitute distal end optical mode
The output end of block, the distal end laser is connected by the input terminal of optical fiber and proximal detector；The distal end detector it is defeated
Enter end to connect by optical fiber with the output end of proximal end laser.
Far-end switch of the present invention uses RF switch, and the common radio-frequency end external antenna of the far-end switch is used for
Receive or send signal；One radio-frequency head of the far-end switch is connect with the output end of distal end detector；The far-end switch
Another radio-frequency head connect with the input terminal of distal end laser.
The distal end bias switching circuit is connect with the control terminal of distal end laser, the control terminal of far-end switch, and control is remote
Working condition, the on-off of far-end switch for holding laser realize control by being used in conjunction with each other with proximal end bias switching circuit
The upstream or downstream of radiofrequency signal processed.
Further, the voltage conversion circuit includes inductance L2, capacitor C2, resistance R15, resistance R16, resistance R9, three
Pole pipe Q2；
The output end of a termination distal end detector of the inductance L2, the other end of inductance L2 are grounded by resistance R15；
Between an end Jie inductance L2, the resistance R15 of the capacitor C2；The other end of capacitor C2 is grounded；
The base stage of the triode Q2 connects between inductance L2, resistance R15, and the emitter of triode Q2 is connect by resistance R9
Ground；
The collector of the triode Q2 connects+5V power supply by resistance R16, while the collector of triode Q2 is respectively and far
The input terminal connection of the control terminal, distal end voltage follower circuit module of end switch.
Still further, the distal end voltage follower circuit module includes resistance R10, potentiometer TV2, resistance R12, second
Operational amplifier；
Between an end Jie resistance R16 of the resistance R10, the collector of triode Q2；Another termination electricity of resistance R10
The mobile terminal of position device TV2；
The mobile terminal of the potentiometer TV2 is connect with a fixing end of potentiometer TV2, and with second operational amplifier
Inverting input terminal connection；
Another fixing end of the potentiometer TV2 is grounded；
The output end of the second operational amplifier is connect by resistance R12 with far-end switch circuit module；
The non-inverting input terminal of the second operational amplifier is connect with far-end switch circuit module.
Still further, the far-end switch circuit module includes resistance R13, triode Q3, resistance R14, inductance L3, electricity
Hinder R17；
The base stage of the triode Q3 is connected by resistance R12 and the output end of second operational amplifier；
The emitter of the triode Q3 and the non-inverting input terminal of second operational amplifier connect, and the transmitting of triode Q3
Pole is grounded by resistance R13；
The collector of the triode Q3 passes sequentially through the control of resistance R14, inductance L3, resistance R17 and distal end laser
End connection.
Beneficial effects of the present invention are as follows:
The present invention is described for cleverly designing proximal end bias switching circuit, remote in time division duplex simulation optical communication system
Bias switching circuit is held, is detected by proximal end bias switching circuit, remote switch, proximal end laser, proximal detector, distal end
The control access of device, distal end bias switching circuit, distal end laser, far-end switch composition uplink and downlink optical link, thus in control
The working condition of downstream laser, solves that the isolation in existing radio over fibre system between uplink downlink is limited to ask
Topic, while distant-end node is simplified, and is increased the reliability of distant-end node, is reduced system cost.
Detailed description of the invention
Fig. 1 is connection schematic diagram of the present embodiment for time division duplex simulation optical communication system.
Fig. 2 is the structural schematic diagram of proximal end bias switching circuit described in Fig. 1.
Fig. 3 is a part of circuit connection diagram of proximal end bias switching circuit described in Fig. 2.
Fig. 4 is another part circuit connection diagram of proximal end bias switching circuit described in Fig. 2.
Fig. 5 is the structural schematic diagram of distal end bias switching circuit described in Fig. 1.
Fig. 6 is the detailed circuit connection schematic diagram of distal end bias switching circuit described in Fig. 5.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and detailed description.
Embodiment 1
As shown in Figure 1, a kind of simulate optical communication system, including proximal end optical module for time division duplex, with proximal end optical module
The distal end optical module being used cooperatively；The proximal end optical module includes the proximal end of proximal end bias switching circuit, uplink and downlink signals distribution
Switch, the proximal end laser for carrying out electro-optic conversion, the proximal detector for carrying out photoelectric conversion；The proximal end offsets away
The control terminal on powered-down road is connect with the control terminal of the control terminal of remote switch, proximal end laser respectively；The proximal end biased witch
Circuit is connect with the input terminal of the output end of proximal detector, proximal end laser respectively by remote switch；The distal end optical mode
Block includes distal end laser, distal end bias switching circuit, distal end detector, far-end switch；The distal end bias switching circuit point
It is not connect with distal end laser, distal end detector, far-end switch；The far-end switch external antenna, distal end detector is received
The signal that proximal end laser sends over is sent by external antenna, while far-end switch passes through the signal of receiving antenna
Distal end laser is transferred to proximal detector；The proximal end bias switching circuit generates voltage control by detection input signal
Signal controls remote switch and downlink or uplink link is connected, while controlling proximal end laser and generating optical signal；The distal end biasing
Switching circuit is by detecting whether distal end detector receives optical signal, to generate the conducting of voltage signal control far-end switch
Downlink or uplink link, and control distal end laser and generate optical signal, pass through proximal end bias switching circuit and distal end biased witch
Signal uplink or downlink are realized in the mutual cooperation of circuit.
As shown in Fig. 2, the proximal end bias switching circuit include wave detector module, it is Coupler Module, comparator module, close
Hold voltage follower circuit module, remote switch circuit module；
The Coupler Module, wave detector module, comparator module, proximal end voltage follower circuit module, remote switch electricity
Road module is sequentially connected；
The Coupler Module, the radiofrequency signal for that will input carry out branch, are exported by the straight-through end of Coupler Module
Signal be loaded directly into remote switch, the coupled end output signal of the Coupler Module is used for voltage detecting；
The wave detector module, for the coupler coupled end output signal carry out detection, by the signal from
Ac signal is converted to DC signal；
The comparator sets voltage in the voltage swing and comparator of the DC signal for exporting the wave detector
It is compared, generates detection signal, by the control terminal of obtained detection signal input remote switch, control the logical of remote switch
It is disconnected；
The input terminal of the proximal end voltage follower circuit module and the output end of comparator connect, proximal end voltage follower circuit
The output end of module is connect with the input terminal of remote switch circuit module；
The output end of the remote switch circuit module is connect with the control terminal of proximal end laser.
Remote switch described in the present embodiment uses RF switch；Common radio-frequency end and the proximal end of the remote switch offset away
Close circuit connection；The output end of one radio-frequency head of the remote switch and proximal detector connects, remote switch another
Radio-frequency head is connect with the input terminal of proximal end laser.The output two path control signal of proximal end biased witch described in the present embodiment, one
Road is used to control the on-off of remote switch, and another way is used to control the working condition of proximal end laser, realizes control radiofrequency signal
Downlink or uplink.
As shown in figure 3, the Coupler Module includes coupler, resistance R1；Coupler described in the present embodiment is using micro-
Band coupler；
The input terminal of the coupler is used for input radio frequency signal；
The straight-through end of the coupler is electrically connected with the common radio-frequency end of remote switch；
The coupled end of the coupler is electrically connected with the input terminal of wave detector module；
The isolation end of the coupler is grounded by resistance R1.
As shown in figure 3, the wave detector module includes capacitor C8, resistance R2, capacitor C9, wave detector；Shown in the present embodiment
Wave detector uses model LT5534；
The RF pin of the wave detector is connected by the coupled end of capacitor C8 and coupler；
The Vout pin of the wave detector is connected by resistance R2 and the input terminal of comparator module；
Between an end Jie resistance R2 and comparator of the capacitor C9, the other end of the capacitor C9 is grounded；
The EN pin of the wave detector connects+5V power supply.
As shown in figure 3, the comparator module includes comparator, resistance R3, resistance R4；Comparator described in the present embodiment is adopted
Model LMV7239；
The Vin- pin of the comparator is connected by the Vout pin of resistance R2 and wave detector；
The V+ pin of the comparator connects+5V power supply；
The V- pin of the comparator is grounded；
The Vin+ of the comparator is connect with one end of one end of resistance R4, resistance R3 respectively；The resistance R4's is another
Termination+5V power supply, the other end ground connection of the resistance R3；
The input with the control terminal of remote switch, proximal end voltage follower circuit module respectively of the Vout pin of the comparator
End connection.
As shown in figure 4, the proximal end voltage follower circuit module includes resistance R5, potentiometer TV1, the first operation amplifier
Device, resistance R6；
The Vout pin of a termination comparator of the resistance R5, the mobile terminal of another termination potentiometer TV1 of resistance R5
Connection；
A fixing end of the potentiometer TV1 is connect with the mobile terminal of position device TV1, and anti-with the first operational amplifier
The connection of phase input terminal；Another fixing end of the potentiometer TV1 is grounded；
The non-inverting input terminal of first operational amplifier is electrically connected with remote switch circuit module；
The output end of first operational amplifier is electrically connected by resistance R6 with remote switch circuit module.
Voltage follower circuit module in proximal end described in the present embodiment realizes there is high input resistance using the first operational amplifier
Anti- and low output impedance improves the carrying load ability of circuit, is connected directly brought influence between reduction circuit, plays buffering and make
With.
As shown in figure 4, the remote switch circuit module includes triode Q1, resistance R7, resistance R8, inductance L1, resistance
R0；
The base stage of the triode Q1 is connect with one end of resistance R6；The emitter of the triode Q1 is connect by resistance R7
Ground, while the emitter of triode Q1 is connect with the non-inverting input terminal of the first operational amplifier；
The collector of the triode Q1 passes sequentially through the control terminal of resistance R8, inductance L1, resistance R0 and proximal end laser
Connection.
Remote switch circuit module described in the present embodiment constitutes the current loop of laser, when remote switch circuit module is led
When logical, laser is worked normally；Conversely, laser does not work when the cut-off of remote switch circuit module.It is close described in the present embodiment
Switch of the triode Q1 as on-off in end switch circuit module realizes control laser.
As shown in Figure 1, when there is signal to be input to coupler from AP point, by the function of coupler, wave detector and comparator
Rate detection, in the output end output+5V voltage control signal of comparator, which is divided into two-way, controls proximal end respectively and opens
Conducting downlink is closed, while providing supply voltage to proximal end voltage follower circuit module.Resistance R5 is used cooperatively with potentiometer TV1,
For providing suitable input voltage to the first operational amplifier, the voltage swing that 3 points of B, C, F is equal.Resistance R6 is used for three
Pole pipe Q1 provides suitable base current.When the voltage of A point is+5V, E point voltage is greater than the cut-in voltage of triode Q1, this
When, triode Q1 conducting, proximal end laser works normally, output optical signal, downlink conducting.Resistance R8 is used for triode
Q1 provides suitable collector current.
When no signal is input to coupler from AP point, 0V voltage control signal is exported in the output end of comparator, respectively
It controls remote switch and uplink is connected, while making proximal end voltage follower circuit module non-transformer voltage, the first operational amplifier not work
Make, be not turned on so as to cause triode Q1, proximal end laser is finally made not work, downlink is exported without optical signal, downlink chain
Road disconnects.
As shown in figure 5, distal end bias switching circuit described in the present embodiment include far-end switch circuit module, distal end voltage with
With circuit module, voltage conversion circuit；
It is the distal end detector, voltage conversion circuit, distal end voltage follower circuit module, far-end switch circuit module, remote
End laser is sequentially connected electrically, meanwhile, the output end of the voltage conversion circuit and the control terminal of far-end switch connect；The electricity
Voltage conversion circuit is used to the photoelectric current generated on the detector of distal end being converted into voltage signal.
Far-end switch described in the present embodiment uses RF switch, and the common radio-frequency end external antenna of the far-end switch is used
In receiving or sending signal；One radio-frequency head of the far-end switch is connect with the output end of distal end detector；It opens the distal end
Another radio-frequency head closed is connect with the input terminal of distal end laser.
The distal end bias switching circuit is connect with the control terminal of distal end laser, the control terminal of far-end switch, and control is remote
Hold working condition, the on-off of far-end switch of laser.The phase of the distal end bias switching circuit and proximal end bias switching circuit
It is mutually used cooperatively, judges the upstream or downstream of signal, control the on-off of uplink optical link, and the conducting of control far-end switch,
Realize the upstream or downstream of control radiofrequency signal.
As shown in fig. 6, the voltage conversion circuit includes inductance L2, capacitor C2, resistance R15, resistance R16, resistance R9, three
Pole pipe Q2；
The output end of a termination distal end detector of the inductance L2, the other end of inductance L2 are grounded by resistance R15；
Between an end Jie inductance L2, the resistance R15 of the capacitor C2；The other end of capacitor C2 is grounded；
The base stage of the triode Q2 connects between inductance L2, resistance R15, and the emitter of triode Q2 is connect by resistance R9
Ground；
The collector of the triode Q2 connects+5V power supply by resistance R16, while the collector of triode Q2 is respectively and far
The input terminal connection of the control terminal, distal end voltage follower circuit module of end switch.
Resistance R15 described in the present embodiment is used to provide suitable base voltage for triode Q2, and resistance R16 is triode Q2
Suitable collector current is provided, resistance R9 provides suitable emitter current for triode Q2 and provides suitably for B1 point
Voltage.When distal end, detector receives the downlink optical signal from optical fiber, and distal end detector generates photoelectric current, through inductance L2 and electricity
After holding C2, AC compounent is filtered out, retains DC component.Photoelectric current passes through resistance R15, and voltage is generated on resistance R15, A1 point
Voltage is higher than the conducting voltage of triode Q2, and triode Q2 is connected at this time.Since the resistance value of selection resistance R16 is far longer than resistance
The resistance value of R9, therefore when triode Q2 conducting, the voltage of B1 point leads to distal end voltage follower circuit, far-end switch electricity close to 0
Road does not work, so that distal end laser is exported without optical signal, uplink optical link is disconnected.
When distal end detector does not receive the downlink optical signal from optical fiber, distal end detector is exported without photoelectric current, A1
The voltage of point is 0V, at this point, triode Q2 ends.The voltage of B1 point is provided close to+5V for distal end voltage follower circuit module
Supply voltage makes its normal work, while far-end switch circuit module is connected, so that distal end laser has optical signal defeated
Out, uplink optical link is connected.
As shown in fig. 6, the distal end voltage follower circuit module includes resistance R10, potentiometer TV2, resistance R12, second
Operational amplifier；
Between an end Jie resistance R16 of the resistance R10, the collector of triode Q2；Another termination electricity of resistance R10
The mobile terminal of position device TV2；
The mobile terminal of the potentiometer TV2 is connect with a fixing end of potentiometer TV2, and with second operational amplifier
Inverting input terminal connection；
Another fixing end of the potentiometer TV2 is grounded；
The output end of the second operational amplifier is connect by resistance R12 with far-end switch circuit module；
The non-inverting input terminal of the second operational amplifier is connect with far-end switch circuit module.
As shown in fig. 6, the far-end switch circuit module includes resistance R13, triode Q3, resistance R14, inductance L3, electricity
Hinder R17；
The base stage of the triode Q3 is connected by resistance R12 and the output end of second operational amplifier；
The emitter of the triode Q3 and the non-inverting input terminal of second operational amplifier connect, and the transmitting of triode Q3
Pole is grounded by resistance R13；
The collector of the triode Q3 passes sequentially through the control of resistance R14, inductance L3, resistance R17 and distal end laser
End connection.
When optical fiber link is in emission state, proximal end bias switching circuit has detected radiofrequency signal input, generates electricity
Downlink is connected in voltage-controlled signal control remote switch processed, while controlling proximal end laser output light signal；The distal end biasing
Switching circuit detects that distal end detector receives optical signal, and distal end bias switching circuit generates voltage signal and controls far-end switch
Downlink is connected, while controlling distal end laser, exports it without optical signal, uplink optical link disconnects, downlink conducting.
When optical fiber link is in reception state, proximal end bias switching circuit detects no radiofrequency signal input, generates electricity
Uplink is connected in voltage-controlled signal control remote switch processed, while controlling proximal end laser and exporting without optical signal；The distal end is inclined
It sets switching circuit and detects that distal end detector does not receive optical signal, distal end bias switching circuit generates voltage signal control distal end
Switch conduction uplink, while distal end laser is controlled, output optical signal, the conducting of uplink optical link, downlink disconnection.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.Any modification done within the spirit and principles of the present invention and changes equivalent replacement
Into etc., it should all be included in the scope of protection of the claims of the present invention.
Claims (10)
1. one kind simulates optical communication system, including proximal end optical module for time division duplex, it is used cooperatively with proximal end optical module remote
Hold optical module；The proximal end optical module includes proximal end bias switching circuit, remote switch, proximal end laser, proximal detector；Institute
The control terminal for stating proximal end bias switching circuit is connect with the control terminal of the control terminal of remote switch, proximal end laser respectively；It is described
Proximal end bias switching circuit is connect with the input terminal of the output end of proximal detector, proximal end laser respectively by remote switch；
The distal end optical module includes distal end laser, distal end bias switching circuit, distal end detector, far-end switch；The distal end is inclined
Switching circuit is set to connect with distal end laser, distal end detector, far-end switch respectively；The far-end switch external antenna, will be remote
End detector receives the signal that proximal end laser sends over and is sent by external antenna, while far-end switch will receive day
The signal of line is transferred to proximal detector by distal end laser；It is characterized by: the proximal end bias switching circuit passes through inspection
Input signal is surveyed, voltage control signal control remote switch is generated and downlink or uplink link is connected, while controlling proximal end laser
Generate optical signal；The distal end bias switching circuit is by detecting whether distal end detector receives optical signal, to generate electricity
The conducting downlink or uplink link of signal control far-end switch is pressed, and controls distal end laser and generates optical signal, it is inclined by proximal end
The mutual cooperation of switching circuit Yu distal end bias switching circuit is set, realizes signal uplink or downlink.
2. according to claim 1 simulate optical communication system for time division duplex, it is characterised in that: the proximal end offsets away
Powered-down road includes wave detector module, Coupler Module, comparator module, proximal end voltage follower circuit module, remote switch circuit
Module；
The Coupler Module, wave detector module, comparator module, proximal end voltage follower circuit module, remote switch circuit mould
Block is sequentially connected；
The Coupler Module, the radiofrequency signal for that will input carry out branch, the letter exported by the straight-through end of Coupler Module
It number is loaded directly into remote switch, the coupled end output signal of the Coupler Module is used for voltage detecting；
The wave detector module, the signal for the coupled end output to the coupler carries out detection, by the signal from exchange
Electric signal is converted to DC signal；
The comparator sets voltage progress in the voltage swing and comparator of the DC signal for exporting the wave detector
Compare, generate detection signal, by the control terminal of obtained detection signal input remote switch, controls the on-off of remote switch；
The input terminal of the proximal end voltage follower circuit module and the output end of comparator connect, proximal end voltage follower circuit module
Output end connect with the input terminal of remote switch circuit module；
The output end of the remote switch circuit module is connect with the control terminal of proximal end laser.
3. according to claim 2 simulate optical communication system for time division duplex, it is characterised in that: the Coupler Module
Including coupler, resistance R1；
The input terminal of the coupler is used for input radio frequency signal；
The straight-through end of the coupler is electrically connected with the common radio-frequency end of remote switch；
The coupled end of the coupler is electrically connected with the input terminal of wave detector module；
The isolation end of the coupler is grounded by resistance R1.
4. according to claim 3 simulate optical communication system for time division duplex, it is characterised in that: the wave detector module
Including capacitor C8, resistance R2, capacitor C9, wave detector；
The RF pin of the wave detector is connected by the coupled end of capacitor C8 and coupler；
The Vout pin of the wave detector is connected by resistance R2 and the input terminal of comparator module；
Between an end Jie resistance R2 and comparator of the capacitor C9, the other end of the capacitor C9 is grounded；
The EN pin of the wave detector connects+5V power supply.
5. according to claim 4 simulate optical communication system for time division duplex, it is characterised in that: the comparator module
Including comparator, resistance R3, resistance R4；
The Vin- pin of the comparator is connected by the Vout pin of resistance R2 and wave detector；
The V+ pin of the comparator connects+5V power supply；
The V- pin of the comparator is grounded；
The Vin+ of the comparator is connect with one end of one end of resistance R4, resistance R3 respectively；Another termination of the resistance R4+
5V power supply, the other end ground connection of the resistance R3；
The Vout pin of the comparator connects with the input terminal of the control terminal of remote switch, proximal end voltage follower circuit module respectively
It connects.
6. it is according to claim 5 for time division duplex simulate optical communication system, it is characterised in that: the proximal end voltage with
It include resistance R5, potentiometer TV1, the first operational amplifier, resistance R6 with circuit module；
The Vout pin of a termination comparator of the resistance R5, the mobile terminal connection of another termination potentiometer TV1 of resistance R5；
A fixing end of the potentiometer TV1 is connect with the mobile terminal of position device TV1, and defeated with the reverse phase of the first operational amplifier
Enter end connection；Another fixing end of the potentiometer TV1 is grounded；
The non-inverting input terminal of first operational amplifier is electrically connected with remote switch circuit module；
The output end of first operational amplifier is electrically connected by resistance R6 with remote switch circuit module.
7. according to claim 6 simulate optical communication system for time division duplex, it is characterised in that: the remote switch electricity
Road module includes triode Q1, resistance R7, resistance R8, inductance L1, resistance R0；
The base stage of the triode Q1 is connect with one end of resistance R6；The emitter of the triode Q1 is grounded by resistance R7,
The emitter of triode Q1 is connect with the non-inverting input terminal of the first operational amplifier simultaneously；
The collector of the triode Q1 passes sequentially through resistance R8, inductance L1, resistance R0 and connect with the control terminal of proximal end laser.
8. according to claim 1 simulate optical communication system for time division duplex, it is characterised in that: the distal end offsets away
Powered-down road includes far-end switch circuit module, distal end voltage follower circuit module, voltage conversion circuit；
The distal end detector, voltage conversion circuit, distal end voltage follower circuit module, far-end switch circuit module, distal end are swashed
Light device is sequentially connected electrically, meanwhile, the output end of the voltage conversion circuit and the control terminal of far-end switch connect；The voltage turns
Circuit is changed for the photoelectric current generated on the detector of distal end to be converted into voltage signal.
9. according to claim 8 simulate optical communication system for time division duplex, it is characterised in that: the voltage conversion electricity
Road includes inductance L2, capacitor C2, resistance R15, resistance R16, resistance R9, triode Q2；
The output end of a termination distal end detector of the inductance L2, the other end of inductance L2 are grounded by resistance R15；
Between an end Jie inductance L2, the resistance R15 of the capacitor C2；The other end of capacitor C2 is grounded；
The base stage of the triode Q2 connects between inductance L2, resistance R15, and the emitter of triode Q2 is grounded by resistance R9；
The collector of the triode Q2 connects+5V power supply by resistance R16, at the same the collector of triode Q2 respectively with distally open
The input terminal connection of the control terminal, distal end voltage follower circuit module of pass.
10. according to claim 9 simulate optical communication system for time division duplex, it is characterised in that: the distal end voltage
Following circuit module includes resistance R10, potentiometer TV2, resistance R12, second operational amplifier；
Between an end Jie resistance R16 of the resistance R10, the collector of triode Q2；Another termination potentiometer of resistance R10
The mobile terminal of TV2；
The mobile terminal of the potentiometer TV2 is connect with a fixing end of potentiometer TV2, and the reverse phase with second operational amplifier
Input terminal connection；
Another fixing end of the potentiometer TV2 is grounded；
The output end of the second operational amplifier is connect by resistance R12 with far-end switch circuit module；
The non-inverting input terminal of the second operational amplifier is connect with far-end switch circuit module；
The far-end switch circuit module includes resistance R13, triode Q3, resistance R14, inductance L3, resistance R17；
The base stage of the triode Q3 is connected by resistance R12 and the output end of second operational amplifier；
The emitter of the triode Q3 and the non-inverting input terminal of second operational amplifier connect, and the emitter of triode Q3 is logical
Cross resistance R13 ground connection；
The control terminal that the collector of the triode Q3 passes sequentially through resistance R14, inductance L3, resistance R17 and distal end laser connects
It connects.
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| CN110429984B (en) | 2022-12-27 |
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Denomination of invention: A Time Division Duplex Analog Optical Communication System Effective date of registration: 20230418 Granted publication date: 20221227 Pledgee: Bank of China Limited by Share Ltd. Guangzhou Tianhe branch Pledgor: GUANGZHOU F.R.O ELECTRONIC TECHNOLOGY Inc.,Ltd. Registration number: Y2023980038401 |