CN109379141A - A kind of time division duplex light-carried wireless Transmission system - Google Patents
A kind of time division duplex light-carried wireless Transmission system Download PDFInfo
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- CN109379141A CN109379141A CN201811394271.4A CN201811394271A CN109379141A CN 109379141 A CN109379141 A CN 109379141A CN 201811394271 A CN201811394271 A CN 201811394271A CN 109379141 A CN109379141 A CN 109379141A
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- proximal end
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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
- H04B10/40—Transceivers
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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Abstract
The invention discloses a kind of time division duplex light-carried wireless Transmission systems, including access point, proximal end optical module, distal end optical module, analog optic fiber line, the antenna for receiving and dispatching TDD mode signal for transmitting optical signal between proximal end optical module and distal end optical module accessed for TDD mode signal；The proximal end optical module realizes the electro-optic conversion of downstream electrical signals and the photoelectric conversion of uplink optical signal for realizing the control of downlink optical link and the distribution transmission of uplink and downlink signals；The distal end optical module is used to cooperate the distribution of the control for realizing uplink and uplink and downlink signals to transmit with proximal end optical module, realizes the photoelectric conversion of downlink optical signal and the electro-optic conversion of uplink electrical signals, and realize the enhanced processing of radiofrequency signal.The present invention realizes being effectively isolated between uplink downlink by controlling the on-off of optical link, while the device of distal end optical module is reduced, volume reduces, and the reliability of distal end optical module is greatly increased.
Description
Technical field
The present invention relates to network communication fields, more particularly to a kind of time division duplex light-carried wireless Transmission system.
Background technique
With the rapid development of the communication technology, the coverage area of WiFi and mobile communication is more and more wider, due to building for base station
It is set as huge, complexity height is not convenient for safeguarding, and light-carried wireless technology is come into being.Radio over fibre system utilizes Optical Fiber Transmission distance
Far, the advantages that small, good in anti-interference performance of decaying, realizes remote transmission；Meanwhile distant-end node need to only complete power amplification,
Optical electrical conversion, electrical/optical conversion function, function and structure is relatively simple, can be effectively reduced cost and maintenance difficulties, improves system
The reliability of system.
When light-carried wireless technology is applied to time division duplex transmission mode, downlink operation leads in same frequency thereon
It crosses and distributes different time slots to carry out transmitting-receiving operation.If the isolation between uplink downlink is inadequate, uplink and downlink chain
Road loop easy to form, the signal in uplink (or downlink) link come back to uplink (or downlink) link by loop, pass through
The signal in former link is interfered after amplifier amplification；In addition, by the letter of downlink distant-end node power amplifier
It number is easily leaked in uplink, is damaged so as to cause the low-noise amplifier in uplink because input power is excessive.
Radio over fibre system and mobile communication system generally use integrated single-pole double-throw switch (SPDT) or passive ferrite goes in ring
Device carries out the switch operating of transmission circuit and realizes the isolation of uplink downlink.The former needs additional control circuit, to judge
The uplink and downlink of signal increases the complexity of far-end unit structure, and will lead to increased costs according to high isolation switch；
Latter circuit is simple, but its isolation is limited, and volume is big, and price is also relatively high.In addition, additionally introducing attenuator and amplifier
Also it be used to improve the isolation of link, which increases the complexity and cost of circuit, reduces the reliable of far-end unit
Property.
The isolation in time division duplex radio over fibre system between uplink downlink how is improved, while further increasing distal end
The problem of reliability of node and the maintenance difficulties for reducing far-end unit, and reduction system cost are urgent need to resolve.
Summary of the invention
Isolation in time division duplex radio over fibre system between uplink downlink is small and Maintenance Difficulty in order to solve by the present invention
Big problem is spent, a kind of time division duplex light-carried wireless Transmission system is provided, can improve in time division duplex radio over fibre system
Isolation between uplink downlink improves the reliability of distant-end node and reduces the maintenance difficulties of far-end unit.
To realize aforementioned present invention purpose, the technical solution adopted is as follows: a kind of time division duplex light-carried wireless Transmission system,
Including accessed for TDD mode signal access point, proximal end optical module, distal end optical module, in proximal end optical module and
Analog optic fiber line, the antenna for receiving and dispatching TDD mode signal of optical signal are transmitted between the optical module of distal end；
The proximal end optical module realizes downlink for realizing the control of downlink optical link and the distribution transmission of uplink and downlink signals
The electro-optic conversion of electric signal and the photoelectric conversion of uplink optical signal；
The distal end optical module is used to cooperate the control for realizing uplink and point of uplink and downlink signals with proximal end optical module
With transmission, the photoelectric conversion of downlink optical signal and the electro-optic conversion of uplink electrical signals are realized, and realize the amplification of radiofrequency signal
Processing.
Preferably, the proximal end optical module includes near end signal control module, for carrying out the close of uplink and downlink signals distribution
End switch, the downlink signal for exporting remote switch are converted into the proximal end laser of optical signal by electrical signal form, are used for
The uplink signal transmitted by analog optic fiber line is converted into the proximal detector of electric signal by optical signal form；The simulated light
Fine route includes the analog optic fiber line of uplink and the analog optic fiber line of downlink；
The external access point for the access of TDD mode signal in one end of the near end signal control module, proximal end letter
The other end of number control module is connected with the output end of the input terminal of proximal end laser, proximal detector respectively by remote switch
It connects；The near end signal control module exports two path control signal, all the way for controlling remote switch, all the way for controlling proximal end
Laser；The output end of the proximal end laser is connect by the analog optic fiber line of downlink with distal end optical module；It is described
The analog optic fiber line and distal end optical module that the input terminal of proximal detector passes through uplink.
Further, the near end signal control module includes coupler, wave detector, proximal end comparator, proximal end optical power
Constant circuit；Described access point, coupler, wave detector, proximal end comparator, proximal end optical power constant circuit, proximal end laser according to
Secondary electrical connection, the remote switch are electrically connected with coupler and proximal end comparator respectively；
The coupler, the radiofrequency signal for that will input carry out branch, by the straight-through signal loading for holding output to proximal end
The output signal of switch, coupler is used for voltage detecting；
The wave detector, 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 proximal end comparator is set in the voltage swing and comparator of the DC signal for exporting the wave detector
Voltage is compared, and generates detection signal；
The proximal end optical power constant circuit controls proximal end laser according to the detection signal that proximal end comparator generates
Working condition, while the optical power of stable laser.
Preferably, the distal end optical module includes distal end detector, remote signaling control module, distal end laser, power
Amplifier, low-noise amplifier, far-end switch；
The analog optic fiber line includes the analog optic fiber line of uplink and the analog optic fiber line of downlink, institute
The input terminal for stating distal end detector is connect by the analog optic fiber line of downlink with the output end of proximal end optical module, and distal end is visited
The output end for surveying device is connect by power amplifier with far-end switch；The distal end detector is for transmitting analog optic fiber line
Downlink signal electric signal is converted by optical signal form；
The far-end switch external antenna, while the input with the output end of power amplifier, low-noise amplifier respectively
End connection；The far-end switch is used to carry out the exchange of uplink and downlink of signals；
The output end of the low-noise amplifier is connect with the input terminal of distal end laser, for what is exported to far-end switch
Uplink signal amplifies；
The output end of the distal end laser passes through the analog optic fiber line of uplink and the input terminal of proximal end optical module
Connection, the distal end laser will be for that will be converted into optical signal by electrical signal form uplink signal；
The test side of the remote signaling control module exports two path control signal end for connecing distal end detector,
One end is for controlling far-end switch, and the other end is for controlling distal end laser；The remote signaling control module is close for cooperating
Optical module is held, the on-off for judging uplink and downlink of signals, controlling uplink optical link, and the conducting direction of control far-end switch.
Further, the remote signaling control module includes that indicator light circuit, distal end comparator, distal end optical power are constant
Circuit；The distal end detector, indicator light circuit, distal end comparator, distal end optical power constant circuit, distal end laser are successively electric
Connection, the far-end switch are connect with distal end comparator；
The indicator light circuit connection distal end detector exports corresponding voltage signal according to the working condition of detector,
Indicate whether distal end detector receives optical signal simultaneously；
The distal end comparator is used to receive the voltage signal that the indicator light circuit provides, by itself and distal end comparator
It inside sets voltage to be compared, and generates control voltage and control the distal end optical power constant circuit and far-end switch；
The detection signal that the distal end optical power constant circuit is generated according to comparator controls the work shape of distal end laser
State, while stablizing the optical power of distal end laser.
Further, the indicator light circuit includes NPN triode Q1, Q2, resistance R1, R2, R3, R4, light emitting diode
LED；
The connection of the base stage of the distal end detector and NPN triode Q1, the emitter of NPN triode Q1 are connect by resistance R2
The collector on ground, NPN triode Q1 meets VCC by resistance R1, while the collector of NPN triode Q1 is with NPN triode Q2's
Base stage connection；
The emitter of the NPN triode Q2 is grounded by resistance R4, the collector and light emitting diode of NPN triode Q2
The cathode of LED connects；The anode of the Light-emitting diode LED is connect by resistance R3 with VCC；
The input of the distal end comparator terminates between the base stage of NPN triode Q2 and the collector of NPN triode Q1.
Preferably, the near end signal control module, proximal end laser, remote switch, distal end detector, remote signaling control
The control access of molding block, distal end laser, far-end switch composition uplink and downlink optical link.
Further, the remote switch, far-end switch are all made of RF switch.
Further, when optical fiber link is in emission state, the proximal end laser in the optical module of proximal end has optical signal defeated
Out；The remote signaling control module detects that distal end detector receives optical signal, remote signaling control module control distal end
The conducting of switch connection power amplifier, i.e. downlink；Remote signaling control module controls distal end laser simultaneously, keeps its unglazed
Signal output, uplink optical link disconnect.
Further, when optical fiber link is in reception state, the proximal end laser in the optical module of proximal end is defeated without optical signal
Out, i.e., downlink disconnects；When distal end, detector does not receive optical signal, remote signaling control module controls distal end laser
Output optical signal, while controlling far-end switch and connecting low-noise amplifier, the conducting of uplink optical link.
Beneficial effects of the present invention are as follows: the present invention cleverly designs near end signal control module, remote signaling control mould
Block, by near end signal control module, proximal end laser, distal end detector, remote signaling control module, distal end laser, remote
The control access of end switch composition uplink and downlink optical link solves existing to control the working condition of uplink and downlink laser
The limited problem of isolation in radio over fibre system between uplink downlink, while distant-end node is simplified, and increases distal end
The reliability of node, reduces system cost.
Detailed description of the invention
Fig. 1 is the structural block diagram of time division duplex light-carried wireless Transmission system of the present invention.
Fig. 2 is the structural block diagram of near end signal control module in Fig. 1.
Fig. 3 is the structural block diagram of remote signaling control module in Fig. 1.
Fig. 4 is the basic circuit diagram of indicator light circuit in Fig. 3.
The work flow diagram of signal is controlled when Fig. 5 is signal downlink in Fig. 1.
The work flow diagram of signal is controlled when Fig. 6 is signal uplink in Fig. 1.
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 time division duplex light-carried wireless Transmission system, including what is accessed for TDD mode signal
Access point 100, proximal end optical module 101, distal end optical module 103, for transmitting light between proximal end optical module and distal end optical module
The analog optic fiber line 102 of signal, the antenna 104 for receiving and dispatching TDD mode signal.
The external WiFi signal of access point 100 and TD-LTE 4G signal for the access of TDD mode signal.
The proximal end optical module 101 is realized for realizing the control of downlink optical link and the distribution transmission of uplink and downlink signals
The electro-optic conversion of downstream electrical signals and the photoelectric conversion of uplink optical signal；
The distal end optical module 103, which is used to cooperate with proximal end optical module 101, realizes that the control of uplink and uplink and downlink are believed
Number distribution transmission, realize the photoelectric conversion of downlink optical signal and the electro-optic conversion of uplink electrical signals, and realize radiofrequency signal
Enhanced processing.
The analog optic fiber line 102 includes uplink optical fibers route, downlink optical fiber route.
Proximal end optical module 101 described in the present embodiment includes near end signal control module 111, for carrying out uplink and downlink signals point
The remote switch 112 matched, the downlink signal for exporting remote switch 112 are converted into the proximal end of optical signal by electrical signal form
Laser 113, the proximal detector 114 for the uplink signal transmitted by optical fiber to be converted into electric signal by optical signal form；
The output end of the access point 100 for the access of TDD mode signal and the input terminal of near end signal control module 111
Connection；Near end signal control module 111 exports two path control signal, all the way for controlling remote switch 112, all the way for controlling
Proximal end laser 113, the proximal end control module 111 for realizing the judgement of signal uplink or downlink, downlink optical link it is logical
Disconnected control；For the remote switch 112 there are three port, port 1 is input terminal, and port 2 and port 3 are output end；Near end signal
The output end of control module 111 connect 114 with proximal end laser 113, proximal detector respectively by remote switch 112；It is described
Remote switch 112 use RF switch chip.
The transmitting signal power that the near end signal control module 111 is inputted by detection, and control signal is generated, it controls
The working condition of proximal end laser 113.Remote switch 112 in proximal end optical module 101 realizes the distribution transmission of uplink and downlink signals.
The proximal end optical module 101 is realized for realizing the control of downlink optical link and the distribution transmission of uplink and downlink signals
The electro-optic conversion of electric signal and the photoelectric conversion of optical signal.
Near end signal control module 111 in proximal end optical module described in the present embodiment 101 is transmitted in remote switch 112
Signal be loaded on proximal end laser 113 after the port of remote switch 112 2 exports, realize electric signal to optical signal
Conversion, is sent to distal end optical module 103 by downlink optical fiber route 102.
As shown in Fig. 2, the near end signal control module 111 includes coupler 201, wave detector 202, proximal end comparator
203, proximal end optical power constant circuit 204；It is described access point 110, coupler 201, wave detector 202, proximal end comparator 203, close
End optical power constant circuit 204, proximal end laser 113 are sequentially connected electrically, the remote switch 112 respectively with coupler 201 and
Proximal end comparator 203 is electrically connected；
The coupler 201 is four port elements, one of port ground connection.When port 1 is as input terminal, port 2
For its straight-through end, port 3 is its coupled end；When port 2 is as input terminal, port 1 is its straight-through end, and port 3 is isolated for it
End.The coupler 201, the radiofrequency signal for that will input carry out branch, are opened by signal loading to the proximal end of straight-through end output
112 are closed, the output signal of coupler 201 is used for voltage detecting；
The wave detector 202, the signal for the coupled end output to the coupler 201 carries out detection, by the signal
DC signal is converted to from ac signal；
The proximal end comparator 203, the voltage swing of the DC signal for exporting the wave detector 202 and proximal end
Voltage is set in comparator 203 to be compared, and generates detection signal；
The proximal end optical power constant circuit 204, according to the detection signal that proximal end comparator 203 generates, control proximal end is swashed
The working condition of light device 113, while the optical power of stable laser.
On the one hand the radiofrequency signal inputted from port 1 is divided into two-way by coupler 201 described in the present embodiment, all the way from
Straight-through port 3 is loaded into remote switch 112, distributes to wave detector 202 from coupling port 2 all the way；It on the other hand will be defeated from port 3
The upstream radio-frequency signal entered is transmitted to port 1.Wave detector 202 receives the radio-frequency alternating current signal exported by 201 port 2 of coupler,
And convert thereof into DC signal.Set reference voltage in proximal end comparator 203, the signal voltage that wave detector 202 is exported with
Reference voltage is made comparisons, and the conducting direction of corresponding control voltage control remote switch 112 is generated, while controlling proximal end optical power
The working condition of constant circuit 204, and then control whether proximal end laser 113 generates optical signal.
As shown in Figure 1, distal end optical module described in the present embodiment 103 includes downlink signal for transmitting optical fiber by light
Signal form is converted into the distal end detector 121 of electric signal, remote signaling control module 122, for will be by electrical signal form
Row signal is converted into optical signal distal end laser 123, the power amplifier 124 for amplifying downlink signal, is used for pair
Low-noise amplifier 125 that the uplink signal of far-end switch output amplifies, exchange for carrying out uplink and downlink of signals it is remote
End switch 126, the far-end switch 126 use RF switch.
The input terminal of the distal end detector 121 is swashed by the downlink optical fiber route in analog optic fiber line 102 with proximal end
The output end of light device 113 connects, and the output end of distal end detector 121 passes through the input of power amplifier 124 and far-end switch 126
End connection；The output end of the distal end laser 123 is detected by the uplink optical fibers route in analog optic fiber line 102 with proximal end
The input terminal of device 114 connects, and the input terminal of distal end laser 123 passes through the output of low-noise amplifier 125 and far-end switch 126
End connection；The another output end of the far-end switch 126 is connect with antenna 104；The remote signaling control module 122 exports
Two path control signal is transmitted to far-end switch 126 all the way, and all the way for controlling distal end laser 123, while remote signaling controls
Module 122 is connect with distal end detector 121.
The remote signaling control module 122 judges uplink and downlink of signals, control uplink for cooperating proximal end optical module 101
The on-off of optical link, and the conducting direction of control far-end switch 126；The distal end optical module 103 is used for and proximal end optical module
The control of uplink and the distribution transmission of uplink and downlink signals are realized in 101 cooperations, realize the photoelectric conversion and electric signal of optical signal
Electro-optic conversion, and realize radiofrequency signal enhanced processing.
Whether the detection distal end detector 121 of remote signaling control module 122 described in the present embodiment receives optical signal, and produces
The working condition of raw control signal control distal end laser 123 and far-end switch 126.Distal end detector 121 receives optical signal
When, remote signaling control module 122 controls distal end laser 123 and exports without optical signal, and downlink is connected in far-end switch 126；Distally
When detector 121 does not receive optical signal, distal end laser 123 has optical signal output, and uplink is connected in far-end switch 126.Believe
When number downlink, uplink optical link is disconnected, no light output；Conversely, downlink optical link disconnects, no light output when signal uplink.
Radiofrequency signal is divided into down going channel and data feedback channel by the far-end switch 126 in the distal end optical module 103.Radio frequency
Power amplifier 124 amplify distal end detector 121 export downlink signal, low-noise amplifier 125 amplify antenna it is received on
Row signal.The proximal detector 114, distal end detector 121 are each equipped with photoelectric conversion module, for realizing photoelectric conversion；
The proximal end laser 113, distal end laser 123 are each equipped with electrooptic conversion module, for realizing electro-optic conversion.
As shown in figure 3, remote signaling control module 122 described in the present embodiment includes indicator light circuit 301, distal end comparator
302, distal end optical power constant circuit 303；
The indicator light circuit 301 connects distal end detector 121, according to the working condition of distal end detector 121, output phase
The voltage signal answered, while indicating whether distal end detector 121 receives optical signal；
The distal end comparator 302 is used to receive the voltage signal that the indicator light circuit 301 provides, by itself and distal end ratio
It is compared compared with voltage is set in device 302, and generates control voltage and control the distal end optical power constant circuit 303 and distally open
Close 126；
The detection signal that the distal end optical power constant circuit 303 is generated according to distal end comparator 302 controls proximal end laser
The working condition of device 113, while the optical power of stable laser.
When distal end detector 121 described in the present embodiment receives optical signal, indicator light circuit 301 issues instruction light, simultaneously
Control voltage-drop loading is provided to distal end comparator 302.Reference voltage is set in distal end comparator 302, indicator light circuit 301 is exported
Voltage make comparisons with reference voltage, generate corresponding control voltage control distal end optical power constant circuit 303 and far-end switch
126 working condition.
As shown in figure 4, the indicator light circuit 301 include NPN triode Q1, Q2, resistance R1, R2, R3, R4, shine two
Pole pipe LED；The resistance value of resistance value specific resistance R2, R3, R4 of resistance R1 are high.
The distal end detector 121 is connect with the base stage of NPN triode Q1, and the emitter of NPN triode Q1 passes through resistance
R2 ground connection, the collector of NPN triode Q1 connect VCC, while the collector and NPN triode of NPN triode Q1 by resistance R1
The base stage of Q2 connects；
The emitter of the NPN triode Q2 is grounded by resistance R4, the collector and light emitting diode of NPN triode Q2
The cathode of LED connects；The anode of the Light-emitting diode LED is connect by resistance R3 with VCC；
The input of the distal end comparator 302 terminate at NPN triode Q2 base stage and NPN triode Q1 collector it
Between.
When distal end detector 121 has electric signal output, triode Q1 conducting, since the resistance value of R1 is much larger than R2, P point
Voltage is close to 0, at this point, triode Q2 ends, Light-emitting diode LED no current passes through, and is in OFF state.When distal end detects
When device 121 is exported without electric signal, triode Q1 cut-off, the electric current of R1 all flows to P point, and P point voltage increases, at this point, triode
Q2 conducting, light emitting diode have electric current to pass through, and are in luminance.
Since the level value of P point changes with the output of distal end detector 121, P point is connected with distal end comparator 302, it can
The output variation of distal end detector 121 is allowed to influence the output level of distal end comparator 302, for controlling 123 He of distal end laser
Far-end switch 126.
Near end signal control module 111, proximal end laser 113 described in the present embodiment, remote switch 112, distal end detector
121, remote signaling control module 122, distal end laser 123, far-end switch 122 form the control access of uplink and downlink optical link.
When optical fiber link is in emission state, the proximal end laser 113 in proximal end optical module 101 has optical signal output,
The remote signaling control module 122 detects that distal end detector 121 receives optical signal, remote signaling controller module 122
It controls far-end switch 126 and connects power amplifier, is i.e. downlink is connected；The distal end of the control of remote signaling control module 122 simultaneously
Laser 123 exports it without optical signal, and uplink optical fibers route disconnects.
When optical fiber link is in reception state, the proximal end laser 113 in proximal end optical module 101 is exported without optical signal,
I.e. downlink optical fiber route disconnects；When distal end detector 121 does not receive optical signal simultaneously, 122 distal end of remote signaling control module
Laser 121 has optical signal output, while controlling far-end switch 126 and connecting low-noise amplifier 125, the conducting of uplink optical link.
As shown in figure 5, controlling the work flow diagram of signal when signal downlink.From coupler 201 to 126 direction of far-end switch
The radiofrequency signal of downlink, a portion enter wave detector 202 by 201 port 2 of coupler, and wave detector 202 is penetrated input
Frequency signal is converted into direct current signal from AC signal, is loaded onto proximal end comparator 203, and proximal end comparator 203, which is examined, arrives the direct current
The voltage of signal is greater than reference value, and output high level voltage signal, downlink is connected in control remote switch 112, while controlling proximal end
Optical power constant circuit 204 works, and then proximal end laser 113 is motivated to work, the radiofrequency signal that will be inputted by remote switch 112
It is converted into optical signal, is then transmitted to distal end detector 121 via downlink optical fiber 102.Distal end detector 121 receives optical signal shape
After the downlink signal of formula, electric signal is converted thereof into, while the P point of indicator light circuit 301 is low level, inputs distal end comparator
302, distal end comparator 302 detects that the voltage lower than the interior reference voltage set, generates low level voltage signal, control distal end is opened
126 conducting downlinks are closed, while controlling distal end optical power constant circuit 303 and not working, and then controlling the unglazed letter of distal end laser 123
Number output, uplink optical link disconnect.As a result, when there is signal input in 201 port 1 of coupler, control circuit controls downlink
Connection works normally, while controlling the disconnection of uplink light-path.
As shown in fig. 6, controlling the work flow diagram of signal, when signal uplink, 201 port of coupler, 1 nothing when signal uplink
Signal input, the direct-flow signal voltage that wave detector 202 exports are low level, are loaded onto proximal end comparator 203, proximal end comparator
203 examine the voltage to the direct current signal to be less than reference value, export low level voltage signal, control in the conducting of remote switch 112
Row, while controlling proximal end optical power constant circuit 204 and not working, it then controls proximal end laser 113 and is exported without optical signal, downlink
Link disconnects.Distal end detector 121, which is not received, is connected to optical signal, and the P point for influencing indicator light circuit 301 generates high level, and input is remote
Comparator 302 is held, distal end comparator 302 detects that the voltage is higher than the interior reference voltage set, output high level voltage signal, control
Uplink is connected in far-end switch 126 processed, while controlling the work of distal end optical power constant circuit 303, and then control distal end laser 123
The radiofrequency signal that low-noise amplifier 125 exports is converted into optical signal by electric signal, proximal end detection is sent to by optical fiber 101
Device 114, the connection of uplink optical link.As a result, when 201 port of coupler, 1 no signal inputs, control circuit controls uplink and connects
It is logical to work normally, while controlling the disconnection of downlink light-path.
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. a kind of time division duplex light-carried wireless Transmission system, it is characterised in that: including what is accessed for TDD mode signal
Access point, proximal end optical module, distal end optical module, the simulation for transmitting optical signal between proximal end optical module and distal end optical module
Fibre circuit, the antenna for receiving and dispatching TDD mode signal；
The proximal end optical module realizes downlink telecommunications for realizing the control of downlink optical link and the distribution transmission of uplink and downlink signals
Number electro-optic conversion and uplink optical signal photoelectric conversion；
The distal end optical module is used to cooperate the distribution of the control for realizing uplink and uplink and downlink signals to pass with proximal end optical module
It is defeated, realize the photoelectric conversion of downlink optical signal and the electro-optic conversion of uplink electrical signals, and realize the enhanced processing of radiofrequency signal.
2. time division duplex light-carried wireless Transmission system according to claim 1, it is characterised in that: the proximal end optical module packet
Include near end signal control module, the remote switch for carrying out uplink and downlink signals distribution, the downlink for exporting remote switch
Signal be converted by electrical signal form the proximal end laser of optical signal, the uplink signal for will be transmitted by analog optic fiber line by
Optical signal form is converted into the proximal detector of electric signal；The analog optic fiber line includes the analog optic fiber line of uplink
With the analog optic fiber line of downlink；
The external access point for the access of TDD mode signal in one end of the near end signal control module, near end signal control
The other end of molding block is connect with the output end of the input terminal of proximal end laser, proximal detector respectively by remote switch；Institute
Near end signal control module output two path control signal is stated, all the way for controlling remote switch, all the way for controlling proximal end laser
Device；The output end of the proximal end laser is connect by the analog optic fiber line of downlink with distal end optical module；The proximal end
The analog optic fiber line and distal end optical module that the input terminal of detector passes through uplink.
3. time division duplex light-carried wireless Transmission system according to claim 2, it is characterised in that: the near end signal control
Module includes coupler, wave detector, proximal end comparator, proximal end optical power constant circuit；Described access point, coupler, wave detector,
Proximal end comparator, proximal end optical power constant circuit, proximal end laser are sequentially connected electrically, the remote switch respectively with coupler and
The electrical connection of proximal end comparator；
The coupler, radiofrequency signal for that will input carry out branch, by the signal loading of straight-through end output to remote switch,
The output signal of coupler is used for voltage detecting；
The wave detector, for the coupler coupled end output signal carry out detection, by the signal from exchange telecommunications
Number it is converted to DC signal；
The proximal end comparator sets voltage in the voltage swing and comparator of the DC signal for exporting the wave detector
It is compared, generates detection signal；
The proximal end optical power constant circuit controls the work of proximal end laser according to the detection signal that proximal end comparator generates
State, while stablizing the optical power of proximal end laser.
4. time division duplex light-carried wireless Transmission system according to claim 1, it is characterised in that: the distal end optical module packet
Include distal end detector, remote signaling control module, distal end laser, power amplifier, low-noise amplifier, far-end switch；
The analog optic fiber line includes the analog optic fiber line of uplink and the analog optic fiber line of downlink, described remote
The input terminal of end detector is connect by the analog optic fiber line of downlink with the output end of proximal end optical module, distal end detector
Output end connect with far-end switch by power amplifier；The distal end detector is used for will be under analog optic fiber line transmission
Row signal is converted into electric signal by optical signal form；
The far-end switch external antenna, while connecting respectively with the input terminal of the output end of power amplifier, low-noise amplifier
It connects；The far-end switch is used to carry out the exchange of uplink and downlink of signals；
The output end of the low-noise amplifier is connect with the input terminal of distal end laser, the uplink for exporting to far-end switch
Signal amplifies；
The output end of the distal end laser is connect by the analog optic fiber line of uplink with the input terminal of proximal end optical module,
The distal end laser will be for that will be converted into optical signal by electrical signal form uplink signal；
The test side of the remote signaling control module exports two path control signal end, one end for connecing distal end detector
For controlling far-end switch, the other end is for controlling distal end laser；The remote signaling control module is for cooperating proximal end light
Module, the on-off for judging uplink and downlink of signals, controlling uplink optical link, and the conducting direction of control far-end switch.
5. time division duplex light-carried wireless Transmission system according to claim 3, it is characterised in that: the remote signaling control
Module includes indicator light circuit, distal end comparator, distal end optical power constant circuit；It is the distal end detector, indicator light circuit, remote
End comparator, distal end optical power constant circuit, distal end laser are sequentially connected electrically, and the far-end switch and distal end comparator connect
It connects；
The indicator light circuit connection distal end detector exports corresponding voltage signal, simultaneously according to the working condition of detector
Whether instruction distal end detector receives optical signal；
The distal end comparator is used to receive the voltage signal that the indicator light circuit provides, by its with set in the comparator of distal end
Voltage is compared, and is generated control voltage and controlled the distal end optical power constant circuit and far-end switch；
The detection signal that the distal end optical power constant circuit is generated according to distal end comparator controls the work shape of distal end laser
State, while stablizing the optical power of distal end laser.
6. time division duplex light-carried wireless Transmission system according to claim 5, it is characterised in that: the indicator light circuit packet
Include NPN triode Q1, Q2, resistance R1, R2, R3, R4, Light-emitting diode LED；
The connection of the base stage of the distal end detector and NPN triode Q1, the emitter of NPN triode Q1 are grounded by resistance R2,
The collector of NPN triode Q1 connects VCC, while the base stage of the collector of NPN triode Q1 and NPN triode Q2 by resistance R1
Connection；
The emitter of the NPN triode Q2 is grounded by resistance R4, the collector and Light-emitting diode LED of NPN triode Q2
Cathode connection；The anode of the Light-emitting diode LED is connect by resistance R3 with VCC；
The input of the distal end comparator terminates between the base stage of NPN triode Q2 and the collector of NPN triode Q1.
7. described in any item time division duplex light-carried wireless Transmission systems according to claim 1 ~ 6, it is characterised in that: the proximal end
Signal control module, proximal end laser, remote switch, distal end detector, remote signaling control module, distal end laser, distal end
The control access of switch composition uplink and downlink optical link.
8. time division duplex light-carried wireless Transmission system according to claim 7, it is characterised in that: the remote switch, remote
End switch is all made of RF switch.
9. according to the described in any item time division duplex light-carried wireless Transmission systems of claim 7, it is characterised in that: work as optical fiber link
When in emission state, the proximal end laser in the optical module of proximal end has optical signal output；The remote signaling control module detection
Optical signal is received to distal end detector, remote signaling control module controls far-end switch and connects power amplifier, i.e. downlink chain
Road conducting；Remote signaling control module controls distal end laser simultaneously, exports it without optical signal, and uplink optical link disconnects.
10. a kind of time division duplex light-carried wireless Transmission system according to claim 7, it is characterised in that: work as optical fiber link
When in reception state, the proximal end laser in the optical module of proximal end is exported without optical signal, i.e., downlink disconnects；When distal end detects
When device does not receive optical signal, remote signaling control module controls distal end laser output light signal, while controlling far-end switch
Connect low-noise amplifier, the conducting of uplink optical link.
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