CN102571205A - Transmission method and system for free space optical communication (FSO) signal - Google Patents
Transmission method and system for free space optical communication (FSO) signal Download PDFInfo
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- CN102571205A CN102571205A CN2012100378938A CN201210037893A CN102571205A CN 102571205 A CN102571205 A CN 102571205A CN 2012100378938 A CN2012100378938 A CN 2012100378938A CN 201210037893 A CN201210037893 A CN 201210037893A CN 102571205 A CN102571205 A CN 102571205A
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Abstract
The invention relates to a transmission method and a transmission system for a free space optical communication (FSO) signal. The embodiment of the invention discloses a technical scheme of how to implement LOS (Line Of Sight) alarm unvarnished transmission by the FSO signal transmission system. The FSO signal transmission system comprises second FSO equipment. The second FSO equipment comprises a second receiving module, a second control module and a second optical module; and the second control module is used for turning off a function of outputting an optical signal of the second optical module when the second receiving module does not receive the FSO signal or the strength of the received FSO signal is lower than a preset FSO signal strength. The embodiment of the invention also discloses the transmission method for the FSO signal. Due to the adoption of the transmission method and the transmission system for the FSO signal, when the FSO signal is lost, LOS alarm can be detected by downstream optical equipment abutted with the second FSO equipment.
Description
Technical field
The present invention relates to the communications field, relate in particular to the transmission method and the system of a kind of FSO (Free Space Optical, FSO) signal.
Background technology
Under the trend of " light advances copper and moves back ", Fibre Optical Communication Technology has obtained fast development, and in traditional optical fiber communication, light signal is passed to the data message that carries network terminal or is passed to user side by network terminal by user side by means of optical fiber.The FSO technology is meant in the transmittance process of light signal, converts light signal into FSO signal (a kind of laser signal can be propagated) in air, and passes through the FSO equipment of transfer of air to opposite end, and the FSO equipment by the opposite end is reduced to light signal with the FSO signal again; Need be because the FSO signal is propagated by means of air by means of optical fiber, so the FSO technology can be applied in some and is inappropriate in the scene of laying optical fiber.
The inventor finds in practical application; When FSO equipment does not receive the FSO signal, when the intensity of the FSO signal that perhaps receives is undesirable, because FSO signal or some impurity light that FSO equipment still can be more weak with the intensity that receives convert light signal into; Thereby that cause that downstream light device with the FSO equipment interconnection detects is LOF (Loss Of Frame; LOF) alarm and OOF (Out Of Frame, sliding frame) alarm, rather than LOS (the Loss Of Signal of expectation; Dropout) alarm, the FSO signal transmission system just can not be realized the transmission of LOS alarm like this.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of transmission method and system of FSO signal is provided, can be when the FSO dropout, and make the downstream light device with the 2nd FSO equipment interconnection detect the LOS alarm.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of transmission system of FSO FSO signal, comprising: the 2nd FSO equipment, and said the 2nd FSO equipment comprises: second receiver module, second control module and second optical module;
The FSO conversion of signals that said second optical module is used for said second receiver module is received is a light signal, and exports the downstream light device with said the 2nd FSO equipment interconnection to;
Said second control module is used for not receiving the FSO signal, when perhaps the intensity of the FSO signal of reception is lower than preset FSO signal strength signal intensity, the function of said second optical module output light signal being closed when said second receiver module.
Wherein, said second control module comprises: comparing unit, second control unit and power subsystem;
Said second control unit; Be used for when said second receiver module do not receive the FSO signal, or said comparing unit relatively when the power voltage value of the FSO signal of said second receiver module reception is lower than preset power voltage threshold value; Generate first index signal and export said power subsystem to, control the power failure of said power subsystem said second optical module; Otherwise generate second index signal and export said power subsystem to, control said power subsystem the power supply of said second optical module is opened.
Wherein, When the index signal of said second control unit generation is transformed to second index signal by first index signal; Said second control unit is used for when the preset time-delay time limit arrives; Export said second index signal to said power subsystem, control said power subsystem the power supply of said second optical module is opened.
Wherein, also comprise: a FSO equipment, a said FSO equipment comprises: first optical module, first control module and first laser;
Said first laser is used for converting the light signal that said first optical module receives into the FSO signal, and is sent to the 2nd FSO equipment;
Said first control module is used for not receiving light signal, when perhaps the intensity of the light signal of reception is lower than preset light signal strength, said first laser is sent the function of FSO signal and close when said first optical module.
Wherein, said first control module comprises: the level conversion unit and first control unit;
Said first optical module; Be used for when not receiving light signal, or the intensity of the light signal that receives when being lower than said preset light signal strength; The first input SD signal that generates positive emitter coupling logic PECL level exports said level conversion unit to, otherwise the 2nd SD signal of generation PECL level exports said level conversion unit to;
Said level conversion unit; Be used for a SD conversion of signals of said PECL level be the transistor-transistor logic Transistor-Transistor Logic level a SD signal, or be the 2nd SD signal of Transistor-Transistor Logic level with the 2nd SD conversion of signals of said PECL level, and export said first control unit to;
Said first control unit; Be used for when receiving a SD signal of said Transistor-Transistor Logic level; The bias voltage of said first laser is embedded in 0V; Send the function of FSO signal to close said first laser, and be used for when receiving the 2nd SD signal of said Transistor-Transistor Logic level, open the function that said first laser sends the FSO signal.
Correspondingly, the embodiment of the invention also provides a kind of transmission method of FSO signal, comprising:
Said the 2nd FSO equipment is light signal with the FSO conversion of signals that receives, and exports the downstream light device with said the 2nd FSO equipment interconnection to;
When said the 2nd FSO equipment does not receive the FSO signal, when perhaps the intensity of the FSO signal of reception is lower than preset FSO signal strength signal intensity, the function of said the 2nd FSO equipment output light signal closed.
Wherein, said the 2nd FSO equipment comprises: second receiver module, and second optical module and second control module, said second control module comprises: comparing unit, second control unit and power subsystem;
Saidly do not receive FSO signal, or the intensity of the FSO signal that receives when being lower than preset FSO signal strength signal intensity when said the 2nd FSO equipment, the step that the function of said the 2nd FSO equipment output light signal is closed comprises:
When said second receiver module do not receive the FSO signal, or said comparing unit relatively when the power voltage value of the FSO signal of said second receiver module reception is lower than preset power voltage threshold value; Said second control unit generates first index signal and exports said power subsystem to, controls the power failure of said power subsystem with said second optical module.
Wherein, saidly do not receive FSO signal, or the intensity of the FSO signal that receives when being lower than preset FSO signal strength signal intensity when said the 2nd FSO equipment, after the step that the function of said the 2nd FSO equipment output light signal is closed, said method also comprises:
The power voltage value of the FSO signal that relatively receives to said second receiver module when said comparing unit is higher than said preset power voltage threshold value, and said second control unit generates second index signal;
When the index signal of said second control unit generation is transformed to second index signal by first index signal; When said second control unit arrived in the preset time-delay time limit; Export said second index signal to said power subsystem, control said power subsystem the power supply of said second optical module is opened.
Wherein, said the 2nd FSO equipment is light signal with the FSO conversion of signals that receives, and exports to before the step with the downstream light device of said the 2nd FSO equipment interconnection, also comprises:
The one FSO equipment converts the light signal that receives into the FSO signal, and is sent to the 2nd FSO equipment;
When a said FSO equipment does not receive light signal, when perhaps the intensity of the light signal of reception is lower than preset light signal strength, a said FSO equipment is sent the function of FSO signal and close.
Wherein, a said FSO equipment comprises: first optical module, and first laser and first control module, said first control module comprises: the level conversion unit and first control unit;
Saidly do not receive light signal, or the intensity of the light signal that receives when being lower than preset light signal strength when a said FSO equipment, a said FSO equipment sent the step that the function of FSO signal is closed, comprising:
When said first optical module does not receive light signal, or the intensity of the light signal that receives when being lower than preset light signal strength, said first optical module generates a SD signal of PECL level;
Said level conversion unit is a SD signal of Transistor-Transistor Logic level with a SD conversion of signals of said PECL level, and exports a SD signal of said Transistor-Transistor Logic level to said control unit;
After said control unit receives the SD signal of said TTL, the bias voltage of said first laser is embedded in 0V, to close the function that said first laser sends the FSO signal.
Embodiment of the present invention embodiment has following beneficial effect:
The transmission system of FSO signal of the present invention; Because when second receiver module does not receive FSO signal, or the intensity of FSO signal of reception when being lower than preset FSO signal strength signal intensity; The function of the output light signal of second optical module is closed in meeting; Thereby guarantee so that the downstream light device can detect the LOS alarm exactly, to realize the transmission of LOS alarm not to exporting any type of light signal with the downstream light device of the 2nd FSO equipment interconnection.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of first embodiment of the transmission system of FSO signal provided by the invention;
Fig. 2 is the structural representation of second embodiment of the transmission system of FSO signal provided by the invention;
Fig. 3 is the structural representation of the 3rd embodiment of the transmission system of FSO signal provided by the invention;
Fig. 4 is the structural representation of the 4th embodiment of the transmission system of FSO signal provided by the invention;
Fig. 5 is the structural representation of the 5th embodiment of the transmission system of FSO signal provided by the invention;
Fig. 6 is the schematic flow sheet of embodiment of the transmission method of FSO signal provided by the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Please refer to Fig. 1; It is the structural representation of first embodiment of the transmission system of FSO signal of the present invention; The transmission system of said FSO signal comprises: the 2nd FSO equipment 2, said the 2nd FSO equipment 2 comprises: second receiver module 21, second optical module 22 and second control module 23.
Wherein, second receiver module 21 is used for receiving the FSO signal in space, and this FSO signal is generally sent by the FSO equipment of opposite end, through transfer of air to the second receiver module 21; Need to prove that the 2nd FSO equipment also possesses the function of sending the FSO signal.Particularly; Second receiver module 21 can comprise: receiver lens module and laser detector; Said receiver lens module is used for receiving the FSO signal in space, and to the FSO signal that the receives processing that filters, with the space impurity light that mixes in the filtering FSO signal; The receiver lens module is transported to laser detector through the multimode pigtail that is connected with laser detector with the FSO signal then; Laser detector is according to the FSO signal; Generate the corresponding signal of telecommunication, laser detector can comprise particularly: photodiode, when the FSO signal exposes to photodiode; Photodiode generates corresponding photoelectric current, realizes with the FSO conversion of signals being the purpose of the signal of telecommunication; After laser detector generates the signal of telecommunication; Also to amplify and processing such as shaping this signal of telecommunication; And utilize the signal of telecommunication after amplification and the shaping to drive second optical module 22; Make second optical module 22 generate corresponding light signal, thereby make second optical module 22 realize the FSO signal is reduced to the function of local optical signal; The light signal that second optical module 22 generates will export the downstream light device that docks with the 2nd FSO equipment 2 to and (mainly comprise: optical transceiver).Need to prove that second optical module 22 mainly comprises: laser, can realize the FSO signal is reduced to local optical signal through modulated laser.Need to prove that the wavelength of FSO signal can be 850nm, the wavelength of local optical signal can be 1310nm.
Please refer to Fig. 2, is the structural representation of second embodiment of FSO signal transmission system of the present invention, and the difference of Fig. 2 and Fig. 1 comprises: second control module 23 comprises comparing unit 231, second control unit 232 and power subsystem 233.
Wherein, the power voltage value of the comparing unit 231 FSO signal that is used for second receiver module 21 is received compares with preset power voltage threshold value.
Said second control unit 232 be used for when comparing unit 231 relatively when the power voltage value of FSO signal is lower than said preset power voltage threshold value, generate first index signal and export power subsystem 233 to; The power voltage value that relatively arrives the FSO signal when comparing unit 231 generates second index signal and exports power subsystem 233 to during greater than preset power voltage threshold value.
Further, when the index signal of second control unit, 232 generations was transformed to second index signal by first index signal, second control unit 232 was used for when the preset time-delay time limit arrives, just exporting second index signal to power subsystem 233; The time-delay time limit can be avoided because the frequent switching to second optical module, 22 operating states that the FSO jitter causes through being provided with.Need to prove here; The time-delay controlled function of second control unit 232 can be provided with in advance; The user can open the time-delay controlled function of second control unit 232 or close as required; Whether open time-delay controlled function to second control unit, 232 forward delay interval control signals with the 2nd FSO equipment of indicating through the controller (not shown) that triggers in the 2nd FSO equipment particularly, when for example delay control signal was " 1 ", indication needed to open the time-delay controlled function; When delay control signal was " 0 ", indication need be closed the time-delay controlled function.
Need to prove that when second receiver module 21 did not receive the FSO signal, second control unit 232 also generated first index signal and exports power subsystem 233 to.
Need to prove; The power voltage threshold value can be set according to the concrete condition of different FSO equipment flexibly; When the power voltage of FSO signal is lower than this minimum threshold; The FSO signal has lost the effect of normally carrying data message, and be reduced to local optical signal with the FSO signal and be passed to the downstream light device this moment, will cause the downstream light device to receive wrong data message.
Need to prove that first index signal can be high level " 1 ", second index signal can be low level " 0 ".Perhaps first index signal can be low level " 0 ", and second index signal can be high level " 1 ".
Need to prove, adopt the instrument of the power voltage value of FSO signal in the present embodiment as the intensity of weighing the FSO signal.
When the power voltage value of FSO signal is lower than preset power voltage threshold value, the power supply of second optical module 22 is turn-offed in the present embodiment, with the function of the output local optical signal of closing second optical module 22, successfully to realize the transmission of LOS alarm.Simultaneously; When the power voltage value of FSO signal becomes when being higher than preset power voltage threshold value by being lower than preset power voltage threshold value; Be that the FSO signal recovers just often, after having experienced the preset time-delay time limit, just the power supply of second optical module 22 opened; To recover the normal operating conditions of second optical module 22, avoid because the frequent switching that the FSO jitter causes to the operating state of second optical module 22.
Please refer to Fig. 3, is the structural representation of the 3rd embodiment of the transmission system of FSO signal of the present invention, and the difference of Fig. 4 and Fig. 1 comprises: the FSO signal that the 2nd FSO equipment 2 receives among Fig. 4 is sent by a FSO equipment 1.Particularly, a FSO equipment 1 comprises: first optical module 11 and first laser 12.
Wherein, First optical module 11 is used to receive the light signal of the optical transceiver that docks with a FSO equipment 1; First optical module 11 converts said light signal into the signal of telecommunication then; And the signal of telecommunication amplified and processing such as shaping, and utilize the signal of telecommunication after handling to modulate first laser 12, control first laser 12 and send the FSO signals; Multimode pigtail through being connected with diversing lens group (not shown) is passed to the diversing lens group with the FSO signal then, by the diversing lens group FSO signal is emitted to the 2nd FSO equipment 2.Need to prove that first optical module 11 can mainly be realized by photodetector and amplification and rectification circuit.
Please refer to Fig. 4; It is the structural representation of the 4th embodiment of the transmission system of FSO signal of the present invention; The difference of Fig. 4 and Fig. 3 comprises: a FSO equipment 1 also comprises first control unit 13; Said first control unit 13 is used for not receiving light signal, or the intensity of the light signal that receives when being lower than preset light signal strength at first optical module 11, and the function of the transmission FSO signal of said first laser 12 is closed.Particularly, first control unit 13 can comprise: level conversion unit 131 and control unit 132.
Wherein, When first optical module 11 does not receive local optical signal or the intensity of the light signal that receives when being lower than preset light signal strength; When that is to say that light signal is not in the sensitivity detection range of first optical module 11; First optical module 11 generates a SD signal of PECL (Positive Emitter Coupled Logic, positive emitter coupling logic) level, otherwise generates the 2nd SD signal of PECL level.
The SD conversion of signals that level conversion unit 131 is used for PECL is TTL (transistor transistor logic; Transistor-transistor logic) a SD signal of level, perhaps being used for the 2nd SD conversion of signals of PECL level is the 2nd SD signal of Transistor-Transistor Logic level.
The SD conversion of signals with the PECL level that needs explanation is that the SD signal of Transistor-Transistor Logic level can be realized, perhaps utilize comparator to make up the level shifting circuit realization by level transferring chip, for example principle and the process of utilizing comparator to make up level shifting circuit is described below:
The PECL level generally is the above expression of a 4.0V high level, the low level of expression below the 3.4V, and be that high level or low level PECL level all are high level for TTL.Present embodiment is when making up level shifting circuit, and with the forward input of PECL level as comparator, the negative sense of comparator is imported with 3.7V (intermediate level) as reference level; In addition, the power supply of comparator can be connected into single supply or duplicate supply pattern.As PECL when being high, output also be high (more than the 3V), and when PECL output when low just be low, at this moment, if single supply, it is exactly zero exporting, if duplicate supply, output is-and below the 3V.Further, can also be connected low pass filter between the reference edge in comparison circuit and output,, reach the purpose of stable output to reduce the high-frequency noise on the output level.
Present embodiment is in a FSO equipment 1; When first optical module 11 does not receive local optical signal or the intensity of the light signal that receives when being lower than preset light signal strength; The function of the transmission FSO signal of first laser 12 is closed, thereby avoid sending undesirable FSO signal to the 2nd FSO equipment in the emitting side of FSO signal.
Please refer to Fig. 5, is the structural representation of the 5th embodiment of the transmission system of FSO signal of the present invention, and the difference of Fig. 5 and Fig. 4 comprises: the transmission system of Fig. 5 also comprises: LED indicating module 14.Level conversion unit 131 also is used for exporting the 2nd SD signal of a SD signal of Transistor-Transistor Logic level or Transistor-Transistor Logic level to LED indicating module 14.When LED indicating module 14 receives a SD signal of Transistor-Transistor Logic level; LED lamp in the LED indicating module 14 is in normal bright state; When LED indicating module 14 receives the 2nd SD signal of Transistor-Transistor Logic level; LED lamp in the LED indicating module 14 is in the state that often goes out, and can realize through the LED lamp whether first optical module 11 receives the indication of satisfactory light signal.
The transmission system of above-mentioned FSO signal to embodiments of the invention specifies, and continues the transmission method of the FSO signal of the embodiment of the invention is specifically introduced below in conjunction with accompanying drawing.
Please refer to Fig. 6, is the schematic flow sheet of embodiment of the transmission method of FSO signal of the present invention, and said method comprises:
Step S61, a FSO equipment do not receive local optical signal, or the intensity of the local optical signal that receives when being lower than preset light signal strength, and a said FSO equipment will be closed to the function of the transmission FSO of the 2nd FSO equipment signal.
Wherein, step S61 is an optional step.
Particularly, with reference to shown in Figure 4, a FSO equipment comprises: first optical module, 11, the first lasers 12 and first control module 13, said first control module 13 comprises: the level conversion unit 131 and first control unit 132.
Step S61 comprises: when said first optical module does not receive light signal, or the intensity of the light signal that receives when being lower than preset light signal strength, said first optical module generates a SD signal of PECL level; Otherwise generate the 2nd SD signal of PECL level; Said level conversion unit is a SD signal of Transistor-Transistor Logic level with a SD conversion of signals of said PECL level; And exporting a SD signal of said Transistor-Transistor Logic level to said control unit, perhaps said level conversion unit is that the 2nd SD signal of Transistor-Transistor Logic level exports said control unit to the 2nd SD conversion of signals of said PECL level; When said control unit receives a SD signal of said Transistor-Transistor Logic level; The bias voltage of said first laser is embedded in 0V; To close the function that said first laser will send the FSO signal to the space; When said control unit receives the 2nd SD signal of said Transistor-Transistor Logic level, control said first laser and be in normal operating conditions, normally to send the FSO signal to the space.
Step S62, the 2nd FSO equipment do not receive FSO signal, or the intensity of the FSO signal that receives when being lower than preset FSO signal strength signal intensity, and the function that said the 2nd FSO equipment will be exported local optical signal is closed.
Particularly, said the 2nd FSO equipment 2 as illustrated in fig. 1 and 2 comprises: second receiver module, 21, the second optical modules 22 and second control module 23.Said second control module 23 comprises: comparing unit 231, second control unit 232 and power subsystem 233.
Step S62 comprises: when said second receiver module do not receive the FSO signal, or said comparing unit relatively when the power voltage value of the FSO signal of said second receiver module reception is lower than preset power voltage threshold value, said second control unit generates first index signal and exports said power subsystem to; When said power subsystem receives said first index signal, with the power failure of said second optical module.
Further, after step S63, can also comprise: the power voltage value of the FSO signal that relatively receives to said second receiver module when said comparing unit is higher than said preset power voltage threshold value, and said second control unit generates second index signal; When the index signal of said second control unit generation is transformed to second index signal by first index signal; When said second control unit arrived in the preset time-delay time limit; Export said second index signal to said power subsystem; Control said power subsystem the power supply of said second optical module is opened, to realize time-delay control power subsystem.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium; This program can comprise the flow process like the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above disclosedly be merely preferred embodiment of the present invention; Certainly can not limit the present invention's interest field with this; One of ordinary skill in the art will appreciate that all or part of flow process that realizes the foregoing description; And, still belong to the scope that invention is contained according to the equivalent variations that claim of the present invention is done.
Claims (10)
1. the transmission system of a FSO FSO signal is characterized in that, comprising: the 2nd FSO equipment, and said the 2nd FSO equipment comprises: second receiver module, second control module and second optical module;
The FSO conversion of signals that said second optical module is used for said second receiver module is received is a light signal, and exports the downstream light device with said the 2nd FSO equipment interconnection to;
Said second control module is used for not receiving the FSO signal, when perhaps the intensity of the FSO signal of reception is lower than preset FSO signal strength signal intensity, the function of said second optical module output light signal being closed when said second receiver module.
2. transmission system as claimed in claim 1 is characterized in that, said second control module comprises: comparing unit, second control unit and power subsystem;
Said second control unit; Be used for when said second receiver module do not receive the FSO signal, or said comparing unit relatively when the power voltage value of the FSO signal of said second receiver module reception is lower than preset power voltage threshold value; Generate first index signal and export said power subsystem to, control the power failure of said power subsystem said second optical module; Otherwise generate second index signal and export said power subsystem to, control said power subsystem the power supply of said second optical module is opened.
3. transmission system as claimed in claim 2; It is characterized in that; When the index signal of said second control unit generation is transformed to second index signal by first index signal; Said second control unit is used for when the preset time-delay time limit arrives, exporting said second index signal to said power subsystem, controls said power subsystem the power supply of said second optical module is opened.
4. like each described transmission system among the claim 1-3, it is characterized in that, also comprise: a FSO equipment, a said FSO equipment comprises: first optical module, first control module and first laser;
Said first laser is used for converting the light signal that said first optical module receives into the FSO signal, and is sent to the 2nd FSO equipment;
Said first control module is used for not receiving light signal, when perhaps the intensity of the light signal of reception is lower than preset light signal strength, said first laser is sent the function of FSO signal and close when said first optical module.
5. transmission system as claimed in claim 4 is characterized in that, said first control module comprises: the level conversion unit and first control unit;
Said first optical module; Be used for when not receiving light signal, or the intensity of the light signal that receives when being lower than said preset light signal strength; The first input SD signal that generates positive emitter coupling logic PECL level exports said level conversion unit to, otherwise the 2nd SD signal of generation PECL level exports said level conversion unit to;
Said level conversion unit; Be used for a SD conversion of signals of said PECL level be the transistor-transistor logic Transistor-Transistor Logic level a SD signal, or be the 2nd SD signal of Transistor-Transistor Logic level with the 2nd SD conversion of signals of said PECL level, and export said first control unit to;
Said first control unit; Be used for when receiving a SD signal of said Transistor-Transistor Logic level; The bias voltage of said first laser is embedded in 0V; Send the function of FSO signal to close said first laser, and be used for when receiving the 2nd SD signal of said Transistor-Transistor Logic level, open the function that said first laser sends the FSO signal.
6. the transmission method of a FSO signal is characterized in that, comprising:
Said the 2nd FSO equipment is light signal with the FSO conversion of signals that receives, and exports the downstream light device with said the 2nd FSO equipment interconnection to;
When said the 2nd FSO equipment does not receive the FSO signal, when perhaps the intensity of the FSO signal of reception is lower than preset FSO signal strength signal intensity, the function of said the 2nd FSO equipment output light signal closed.
7. transmission method as claimed in claim 6 is characterized in that, said the 2nd FSO equipment comprises: second receiver module, and second optical module and second control module, said second control module comprises: comparing unit, second control unit and power subsystem;
Saidly do not receive FSO signal, or the intensity of the FSO signal that receives when being lower than preset FSO signal strength signal intensity when said the 2nd FSO equipment, the step that the function of said the 2nd FSO equipment output light signal is closed comprises:
When said second receiver module do not receive the FSO signal, or said comparing unit relatively when the power voltage value of the FSO signal of said second receiver module reception is lower than preset power voltage threshold value; Said second control unit generates first index signal and exports said power subsystem to, controls the power failure of said power subsystem with said second optical module.
8. transmission method as claimed in claim 7; It is characterized in that; Saidly do not receive FSO signal, or the intensity of the FSO signal that receives when being lower than preset FSO signal strength signal intensity when said the 2nd FSO equipment; After the step that the function of said the 2nd FSO equipment output light signal is closed, said method also comprises:
The power voltage value of the FSO signal that relatively receives to said second receiver module when said comparing unit is higher than said preset power voltage threshold value, and said second control unit generates second index signal;
When the index signal of said second control unit generation is transformed to second index signal by first index signal; When said second control unit arrived in the preset time-delay time limit; Export said second index signal to said power subsystem, control said power subsystem the power supply of said second optical module is opened.
9. like each described transmission method among the claim 6-8, it is characterized in that said the 2nd FSO equipment is light signal with the FSO conversion of signals that receives, and export to before the step with the downstream light device of said the 2nd FSO equipment interconnection, also comprise:
The one FSO equipment converts the light signal that receives into the FSO signal, and is sent to the 2nd FSO equipment;
When a said FSO equipment does not receive light signal, when perhaps the intensity of the light signal of reception is lower than preset light signal strength, a said FSO equipment is sent the function of FSO signal and close.
10. transmission method as claimed in claim 9 is characterized in that, a said FSO equipment comprises: first optical module, and first laser and first control module, said first control module comprises: the level conversion unit and first control unit;
Saidly do not receive light signal, or the intensity of the light signal that receives when being lower than preset light signal strength when a said FSO equipment, a said FSO equipment sent the step that the function of FSO signal is closed, comprising:
When said first optical module does not receive light signal, or the intensity of the light signal that receives when being lower than preset light signal strength, said first optical module generates a SD signal of PECL level;
Said level conversion unit is a SD signal of Transistor-Transistor Logic level with a SD conversion of signals of said PECL level, and exports a SD signal of said Transistor-Transistor Logic level to said control unit;
After said control unit receives the SD signal of said TTL, the bias voltage of said first laser is embedded in 0V, to close the function that said first laser sends the FSO signal.
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| CN201210037893.8A CN102571205B (en) | 2012-02-20 | 2012-02-20 | The transmission method of free space optical communication FSO signal and system |
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| CN201210037893.8A CN102571205B (en) | 2012-02-20 | 2012-02-20 | The transmission method of free space optical communication FSO signal and system |
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| CN201210037893.8A Expired - Fee Related CN102571205B (en) | 2012-02-20 | 2012-02-20 | The transmission method of free space optical communication FSO signal and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333445A (en) * | 2014-11-24 | 2015-02-04 | 国网吉林省电力有限公司信息通信公司 | Chaotic encryption method for safety of FSO (Free Space Optics) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295384A (en) * | 1999-11-09 | 2001-05-16 | 布达泰克有限公司 | Laser and microwave hydrid communication method and system |
| CN1633043A (en) * | 2004-11-08 | 2005-06-29 | 深圳市世纪人无线通讯设备有限公司 | Free space optical communication system and transmission power control method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295384A (en) * | 1999-11-09 | 2001-05-16 | 布达泰克有限公司 | Laser and microwave hydrid communication method and system |
| CN1633043A (en) * | 2004-11-08 | 2005-06-29 | 深圳市世纪人无线通讯设备有限公司 | Free space optical communication system and transmission power control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333445A (en) * | 2014-11-24 | 2015-02-04 | 国网吉林省电力有限公司信息通信公司 | Chaotic encryption method for safety of FSO (Free Space Optics) |
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| CN102571205B (en) | 2015-09-30 |
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