CN102571205B - The transmission method of free space optical communication FSO signal and system - Google Patents
The transmission method of free space optical communication FSO signal and system Download PDFInfo
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- CN102571205B CN102571205B CN201210037893.8A CN201210037893A CN102571205B CN 102571205 B CN102571205 B CN 102571205B CN 201210037893 A CN201210037893 A CN 201210037893A CN 102571205 B CN102571205 B CN 102571205B
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Abstract
The transmission method of free space optical communication FSO signal and system.The embodiment of the invention discloses the technical scheme how a kind of free space optical communication FSO signal transmission system realizes LOS alarm transparent transmission, described FSO transmission system comprises: the 2nd FSO equipment, and described 2nd FSO equipment comprises: the second receiver module, the second control module and the second optical module; Described second control module is used for, when described second receiver module does not receive FSO signal or the intensity of FSO signal that receives lower than default FSO signal strength signal intensity, the output optical signal function of described second optical module being closed.The embodiment of the invention also discloses a kind of transmission method of FSO signal.Adopt the present invention, can, when FSO dropout, make LOS alarm to be detected with the downstream light device of the 2nd FSO equipment interconnection.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of FSO(Free Space Optical, free space optical communication) transmission method of signal and system.
Background technology
Under the trend of " light entering and copper back ", Fibre Optical Communication Technology obtains fast development, and in traditional optical fiber communication, the data message carried is passed to network terminal by user side by means of optical fiber or is passed to user side by network terminal by light signal.FSO technology refers in the transmittance process of light signal, light signal is converted to FSO signal (a kind of laser signal can be propagated in atmosphere), and by transfer of air to the FSO equipment of opposite end, then is light signal by the FSO equipment of opposite end by FSO signals revivification; Because FSO signal does not need by means of optical fiber by means of air carries out propagating, therefore FSO technology can be applied in some be unsuitable for lay optical fiber scene in.
Inventor finds in actual applications, when FSO equipment does not receive FSO signal, or when the intensity of the FSO signal received is undesirable, because FSO signal more weak for the intensity of reception or some impurity light still can be converted to light signal by FSO equipment, thus that cause detecting with the downstream light device of FSO equipment interconnection is LOF(Loss Of Frame, LOF) alarm and OOF(Out Of Frame, sliding frame) alarm, instead of the LOS(Loss Of Signal expected, dropout) alarm, such FSO signal transmission system just can not realize the transmission of LOS alarm.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of transmission method and system of FSO signal, can, when FSO dropout, make LOS alarm to be detected with the downstream light device of the 2nd FSO equipment interconnection.
In order to solve the problems of the technologies described above, embodiments provide a kind of transmission system of free space optical communication FSO signal, comprising: the 2nd FSO equipment, described 2nd FSO equipment comprises: the second receiver module, the second control module and the second optical module;
The FSO signal that described second optical module is used for described second receiver module receives is converted to light signal, and exports the downstream light device with described 2nd FSO equipment interconnection to;
Described second control module is used for, when described second receiver module does not receive FSO signal or the intensity of FSO signal that receives lower than default FSO signal strength signal intensity, the function of described second optical module output optical signal being closed.
Wherein, described second control module comprises: comparing unit, the second control unit and power subsystem;
Described second control unit, during for not receiving power voltage value that FSO signal or described comparing unit compare the FSO signal that described second receiver module receives when described second receiver module lower than the power voltage threshold value preset, generate the first index signal and export described power subsystem to, control described power subsystem by the power failure of described second optical module; Otherwise generate the second index signal and export described power subsystem to, control described power subsystem by the confession electric-opening of described second optical module.
Wherein, when the index signal that described second control unit generates is transformed to the second index signal by the first index signal, described second control unit is used for when the time delay time limit of presetting arrives, export described second index signal to described power subsystem, control described power subsystem by the confession electric-opening of described second optical module.
Wherein, also comprise: a FSO equipment, a described FSO equipment comprises: the first optical module, the first control module and the first laser;
The light signal that described first laser is used for described first optical module receives is converted to FSO signal, and is sent to the 2nd FSO equipment;
Described first control module is used for, when described first optical module does not receive light signal or the intensity of light signal that receives lower than the light signal strength preset, described first laser being sent the function closedown of FSO signal.
Wherein, described first control module comprises: level conversion unit and the first control unit;
Described first optical module, for when not receiving light signal or the intensity of light signal that receives lower than described default light signal strength, the the first input SD signal generating positive emitter coupling logic PECL level exports described level conversion unit to, otherwise the 2nd SD signal generating PECL level exports described level conversion unit to;
Described level conversion unit, for a SD signal of described PECL level being converted to a SD signal of transistor-transistor logic Transistor-Transistor Logic level or the 2nd SD signal of described PECL level being converted to the 2nd SD signal of Transistor-Transistor Logic level, and export described first control unit to;
Described first control unit, for when receiving a SD signal of described Transistor-Transistor Logic level, the bias voltage of described first laser is embedded in 0V, to close the function that described first laser sends FSO signal, and for when receiving the 2nd SD signal of described Transistor-Transistor Logic level, open the function that described first laser sends FSO signal.
Correspondingly, the embodiment of the present invention additionally provides a kind of transmission method of FSO signal, comprising:
The FSO signal of reception is converted to light signal by described 2nd FSO equipment, and exports the downstream light device with described 2nd FSO equipment interconnection to;
When described 2nd FSO equipment do not receive FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, the function of described 2nd FSO equipment output optical signal is closed.
Wherein, described 2nd FSO equipment comprises: the second receiver module, the second optical module and the second control module, and described second control module comprises: comparing unit, the second control unit and power subsystem;
Described when described 2nd FSO equipment do not receive FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, by the function of described 2nd FSO equipment output optical signal close step comprise:
When described second receiver module does not receive power voltage value that FSO signal or described comparing unit compare the FSO signal that described second receiver module receives lower than the power voltage threshold value preset, described second control unit generates the first index signal and exports described power subsystem to, controls described power subsystem by the power failure of described second optical module.
Wherein, described when described 2nd FSO equipment do not receive FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, by the function of described 2nd FSO equipment output optical signal close step after, described method also comprises:
When described comparing unit compares the power voltage value of the FSO signal that described second receiver module receives higher than described default power voltage threshold value, described second control unit generates the second index signal;
When the index signal that described second control unit generates is transformed to the second index signal by the first index signal, described second control unit is when the time delay time limit of presetting arrives, export described second index signal to described power subsystem, control described power subsystem by the confession electric-opening of described second optical module.
Wherein, the FSO signal of reception is converted to light signal by described 2nd FSO equipment, and export to the step of the downstream light device of described 2nd FSO equipment interconnection before, also comprise:
The light signal of reception is converted to FSO signal by the one FSO equipment, and is sent to the 2nd FSO equipment;
When a described FSO equipment does not receive light signal or the intensity of light signal that receives lower than the light signal strength preset, the function that a described FSO equipment sends FSO signal is closed.
Wherein, a described FSO equipment comprises: the first optical module, the first laser and the first control module, and described first control module comprises: level conversion unit and the first control unit;
Described when a described FSO equipment does not receive light signal or the intensity of light signal that receives lower than the light signal strength preset, by the step that the function that a described FSO equipment sends FSO signal is closed, comprising:
When described first optical module does not receive light signal or the intensity of light signal that receives lower than default light signal strength, described first optical module generates a SD signal of PECL level;
One SD signal of described PECL level is converted to a SD signal of Transistor-Transistor Logic level by described level conversion unit, and exports a SD signal of described Transistor-Transistor Logic level to described control unit;
The bias voltage of described first laser is embedded in 0V after receiving a SD signal of described TTL by described control unit, to close the function that described first laser sends FSO signal.
Implement the embodiment of the present invention, there is following beneficial effect:
The transmission system of FSO signal of the present invention, due to do not receive when the second receiver module FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, the function of the output optical signal of the second optical module can be closed, thus ensure not export any type of light signal to the downstream light device with the 2nd FSO equipment interconnection, to enable downstream light device LOS alarm be detected exactly, realize the transmission of LOS alarm.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the first embodiment of the transmission system of FSO signal provided by the invention;
Fig. 2 is the structural representation of the 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 the embodiment of the transmission method of FSO signal provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, it is the structural representation of the first embodiment of the transmission system of FSO signal of the present invention, the transmission system of described FSO signal comprises: the 2nd FSO equipment 2, and described 2nd FSO equipment 2 comprises: the second receiver module 21, second optical module 22 and the second control module 23.
Wherein, the second receiver module 21 is for receiving the FSO signal in space, and this FSO signal is generally sent, by transfer of air to the second receiver module 21 by the FSO equipment of opposite end; It should be noted that, the 2nd FSO equipment also possesses the function sending FSO signal.Particularly, second receiver module 21 can comprise: receiver lens module and laser detector, described receiver lens module for receiving the FSO signal in space, and carries out optical filtering process, with the space impurity light mixed in filtering FSO signal to the FSO signal received; Then FSO signal is transported to laser detector by the multimode pigtail be connected with laser detector by receiver lens module; Laser detector is according to FSO signal, generate the corresponding signal of telecommunication, laser detector can comprise particularly: photodiode, when FSO signal exposes to photodiode, photodiode generates corresponding photoelectric current, realizes object FSO signal being converted to the signal of telecommunication; After laser detector generates the signal of telecommunication, also to amplify this signal of telecommunication and the process such as shaping, and utilize the signal of telecommunication after amplification and shaping to drive the second optical module 22, make the second optical module 22 generate corresponding light signal, thus the second optical module 22 is realized FSO signals revivification is the function of local optical signal; The light signal that second optical module 22 generates will export the downstream light device (mainly comprising: optical transmitter and receiver) docked with the 2nd FSO equipment 2 to.It should be noted that, the second optical module 22 mainly comprises: laser, can realize FSO signals revivification being local optical signal by modulated laser.It should be noted that, the wavelength of FSO signal can be 850nm, and the wavelength of local optical signal can be 1310nm.
Second control module 23 for do not receive when the second receiver module 21 FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, the function of the output local optical signal of the second optical module 22 is closed.Due in the present embodiment, by the second control module 23, the function of the output local optical signal of the second optical module 22 is closed, therefore make the second optical module 22 can not generate any type of light signal and export downstream light device to, make downstream light device LOS alarm can successfully be detected, achieve the transmission of LOS alarm.
Please refer to Fig. 2, be the structural representation of the second embodiment of FSO signal transmission system of the present invention, the difference of Fig. 2 and Fig. 1 comprises: the second control module 23 comprises comparing unit 231, second control unit 232 and power subsystem 233.
Wherein, comparing unit 231 compares with the power voltage threshold value preset for the power voltage value of the FSO signal received by the second receiver module 21.
Described second control unit 232 for compare FSO signal when comparing unit 231 power voltage value lower than described default power voltage threshold value time, generate the first index signal and export power subsystem 233 to; When the power voltage value that comparing unit 231 compares FSO signal is greater than default power voltage threshold value, generates the second index signal and export power subsystem 233 to.
Further, when the index signal that the second control unit 232 generates is transformed to the second index signal by the first index signal, the second control unit 232, for when the time delay time limit of presetting arrives, just exports the second index signal to power subsystem 233; By arranging the frequent switching to the second optical module 22 operating state that the time delay time limit can avoid because FSO jitter causes.It should be noted that herein, the delays time to control function of the second control unit 232 can pre-set, the delays time to control function of the second control unit 232 can be opened or close by user as required, in particular by the controller (not shown) in triggering the 2nd FSO equipment to the second control unit 232 forward delay interval control signal to indicate the 2nd FSO equipment whether open time delay controlling functions, such as, when delay control signal is " 1 ", instruction needs open time delay controlling functions, when delay control signal is " 0 ", instruction needs to close delays time to control function.
It should be noted that, when the second receiver module 21 does not receive FSO signal, the second control unit 232 also generates the first index signal and exports power subsystem 233 to.
It should be noted that, power voltage threshold value can set flexibly according to the concrete condition of different FSO equipment, when the power voltage of FSO signal is lower than this minimum threshold, FSO signal has lost the effect of normally carrying data message, be now that local optical signal is passed to downstream light device by FSO signals revivification, by the data message causing downstream light device to receive mistake.
It should be noted that, the first index signal can be high level " 1 ", and the second index signal can be low level " 0 ".Or the first index signal can be low level " 0 ", the second index signal can be high level " 1 ".
It should be noted that, in the present embodiment, adopt the power voltage value of FSO signal as the instrument of the intensity of measurement FSO signal.
Power subsystem 233, for when receiving the first index signal, turns off the power supply of described second optical module 22, to cut out the function of the output local optical signal of the second optical module 22; And when receiving the second index signal, by the confession electric-opening of described second optical module 22, open the function of the output local optical signal of the second optical module 22.
In the present embodiment when the power voltage value of FSO signal is lower than the power voltage threshold value preset, the power supply of the second optical module 22 is turned off, to close the function of the output local optical signal of the second optical module 22, successfully to realize the transmission of LOS alarm.Simultaneously, when the power voltage value of FSO signal is from when becoming the power voltage threshold value higher than presetting lower than the power voltage threshold value preset, namely when FSO signal recuperation is normal, after experienced by the default time delay time limit, just by the confession electric-opening of the second optical module 22, to recover the normal operating conditions of the second optical module 22, avoid the frequent switching of the operating state to the second optical module 22 caused due to FSO jitter.
Please refer to Fig. 3, be the structural representation of the 3rd embodiment of the transmission system of FSO signal of the present invention, the difference of Fig. 4 and Fig. 1 comprises: the FSO signal that in Fig. 4, the 2nd FSO equipment 2 receives is sent by a FSO equipment 1.Particularly, a FSO equipment 1 comprises: the first optical module 11 and the first laser 12.
Wherein, first optical module 11 is for receiving the light signal of the optical transmitter and receiver docked with a FSO equipment 1, then described light signal is converted to the signal of telecommunication by the first optical module 11, and the signal of telecommunication is amplified and the process such as shaping, and utilize the signal of telecommunication after process to modulate the first laser 12, control the first laser 12 and send FSO signal; Then the multimode pigtail by being connected with diversing lens group (not shown), by FSO signal transmission to diversing lens group, is emitted to the 2nd FSO equipment 2 by diversing lens group by FSO signal.It should be noted that, the first optical module 11 can realize primarily of 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 the first control unit 13, described first control unit 13 for do not receive at the first optical module 11 light signal or receive light signal intensity lower than preset light signal strength time, the function of the transmission FSO signal of described first laser 12 is closed.Particularly, the first control unit 13 can comprise: level conversion unit 131 and control unit 132.
Wherein, when the intensity that the first optical module 11 does not receive the light signal of local optical signal or reception is lower than the light signal strength preset, that is when light signal is not within the scope of the sensitivity technique of the first optical module 11, first optical module 11 generates PECL(Positive Emitter Coupled Logic, positive emitter coupling logic) a SD signal of level, otherwise generate the 2nd SD signal of PECL level.
Level conversion unit 131 is for being converted to TTL(transistor transistor logic by a SD signal of PECL, transistor-transistor logic) a SD signal of level, or for the 2nd SD signal of PECL level being converted to the 2nd SD signal of Transistor-Transistor Logic level.
Needing the SD signal SD signal of PECL level being converted to Transistor-Transistor Logic level illustrated can be realized by level transferring chip or utilize comparator to build level shifting circuit to realize, illustrating to utilizing comparator to build the principle of level shifting circuit and process is described below:
PECL level is generally that more than 4.0V represents high level, and below 3.4V represents low level, and be high level or low level PECL level is all high level for TTL.The forward of PECL level as comparator, when building level shifting circuit, inputs by the present embodiment, and 3.7V(intermediate level is used in the negative sense input of comparator) as reference level; In addition, the power supply of comparator can be connected into single supply or duplicate supply pattern.When PECL is high, exporting also is high (more than 3V), and export just for low when PECL is low, now, if single supply, output is exactly zero, if duplicate supply, output is below-3V.Further, the reference edge in comparison circuit can also be connected low pass filter with between output, to reduce the high-frequency noise on output level, reaches the stable object exported.
The bias voltage of the first laser 12, for when receiving a SD signal of TTL, is embedded in 0V by control unit 132, does not send FSO signal to make the first laser 12; And for when receiving the 2nd SD signal of TTL, the first laser 12 normally being worked, FSO signal will be sent to space.
The present embodiment is in a FSO equipment 1, when the intensity that the first optical module 11 does not receive the light signal of local optical signal or reception is lower than the light signal strength preset, the function of the transmission FSO signal of the first laser 12 is closed, thus avoids sending undesirable FSO signal to the 2nd FSO equipment in the emitting side of FSO signal.
Please refer to Fig. 5, be the structural representation of the 5th embodiment of the transmission system of FSO signal of the present invention, 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 is also for exporting a SD signal of Transistor-Transistor Logic level or the 2nd SD signal of Transistor-Transistor Logic level to LED indicating module 14.When LED indicating module 14 receives a SD signal of Transistor-Transistor Logic level, LED in 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 in LED indicating module 14 is in state of often going out, and can realize by LED the instruction whether the first optical module 11 receives satisfactory light signal.
The transmission system of the above-mentioned FSO signal to embodiments of the invention has been described in detail, and continues to be specifically introduced the transmission method of the FSO signal of the embodiment of the present invention below in conjunction with accompanying drawing.
Please refer to Fig. 6, be the schematic flow sheet of the embodiment of the transmission method of FSO signal of the present invention, described method comprises:
Step S61, a FSO equipment do not receive local optical signal or receive local optical signal intensity lower than preset light signal strength time, the function of the transmission FSO signal to the 2nd FSO equipment is closed by a described FSO equipment.
Wherein, step S61 is optional step.
Particularly, shown in figure 4, a FSO equipment comprises: the first optical module 11, first laser 12 and the first control module 13, and described first control module 13 comprises: level conversion unit 131 and the first control unit 132.
Step S61 comprises: when described first optical module does not receive light signal or the intensity of light signal that receives lower than default light signal strength, described first optical module generates a SD signal of PECL level; Otherwise generate the 2nd SD signal of PECL level; One SD signal of described PECL level is converted to a SD signal of Transistor-Transistor Logic level by described level conversion unit, and export a SD signal of described Transistor-Transistor Logic level to described control unit, or described level conversion unit exports the 2nd SD signal that the 2nd SD signal of described PECL level is converted to Transistor-Transistor Logic level to described control unit; When described control unit receives a SD signal of described Transistor-Transistor Logic level, the bias voltage of described first laser is embedded in 0V, the function of FSO signal will be sent to space to close described first laser, when described control unit receives the 2nd SD signal of described Transistor-Transistor Logic level, control described first laser and be in normal operating conditions, normally to send FSO signal to space.
Step S62, the 2nd FSO equipment do not receive FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, described 2nd FSO equipment will export local optical signal function close.
Particularly, described 2nd FSO equipment 2 comprises as illustrated in fig. 1 and 2: the second receiver module 21, second optical module 22 and the second control module 23.Described second control module 23 comprises: comparing unit 231, second control unit 232 and power subsystem 233.
Step S62 comprises: when described second receiver module does not receive power voltage value that FSO signal or described comparing unit compare the FSO signal that described second receiver module receives lower than the power voltage threshold value preset, described second control unit generates the first index signal and exports described power subsystem to; When described power subsystem receives described first index signal, by the power failure of described second optical module.
Further, can also comprise after step S63: when described comparing unit compares the power voltage value of the FSO signal that described second receiver module receives higher than described default power voltage threshold value, described second control unit generates the second index signal; When the index signal that described second control unit generates is transformed to the second index signal by the first index signal, described second control unit is when the time delay time limit of presetting arrives, export described second index signal to described power subsystem, control described power subsystem by the confession electric-opening of described second optical module, to realize the delays time to control to power subsystem.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosedly be only present pre-ferred embodiments, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.
Claims (6)
1. a transmission system for free space optical communication FSO signal, is characterized in that, comprising:
One FSO equipment, a described FSO equipment comprises: the first optical module, the first control module and the first laser;
2nd FSO equipment, described 2nd FSO equipment comprises: the second receiver module, the second control module and the second optical module;
The light signal that described first laser is used for described first optical module receives is converted to FSO signal, and is sent to the 2nd FSO equipment;
First control module comprises: level conversion unit and the first control unit;
Described first optical module, for when do not receive light signal or receive light signal intensity lower than preset light signal strength time, the the first input SD signal generating positive emitter coupling logic PECL level exports described level conversion unit to, otherwise the 2nd SD signal generating PECL level exports described level conversion unit to;
Described level conversion unit, for a SD signal of described PECL level being converted to a SD signal of transistor-transistor logic Transistor-Transistor Logic level or the 2nd SD signal of described PECL level being converted to the 2nd SD signal of Transistor-Transistor Logic level, and export described first control unit to;
Described first control unit, for when receiving a SD signal of described Transistor-Transistor Logic level, the bias voltage of described first laser is embedded in 0V, to close the function that described first laser sends FSO signal, and for when receiving the 2nd SD signal of described Transistor-Transistor Logic level, open the function that described first laser sends FSO signal;
The FSO signal that described second optical module is used for described second receiver module receives is converted to light signal, and exports the downstream light device with described 2nd FSO equipment interconnection to;
Described second control module is used for, when described second receiver module does not receive FSO signal or the intensity of FSO signal that receives lower than default FSO signal strength signal intensity, the function of described second optical module output optical signal being closed.
2. transmission system as claimed in claim 1, it is characterized in that, described second control module comprises: comparing unit, the second control unit and power subsystem;
Described second control unit, during for not receiving power voltage value that FSO signal or described comparing unit compare the FSO signal that described second receiver module receives when described second receiver module lower than the power voltage threshold value preset, generate the first index signal and export described power subsystem to, control described power subsystem by the power failure of described second optical module; Otherwise generate the second index signal and export described power subsystem to, control described power subsystem by the confession electric-opening of described second optical module.
3. transmission system as claimed in claim 2, it is characterized in that, when the index signal that described second control unit generates is transformed to the second index signal by the first index signal, described second control unit is used for when the time delay time limit of presetting arrives, export described second index signal to described power subsystem, control described power subsystem by the confession electric-opening of described second optical module.
4. a transmission method for FSO signal, is characterized in that, comprising:
The light signal of reception is converted to FSO signal by the one FSO equipment, and be sent to the 2nd FSO equipment, and a described FSO equipment comprises the first optical module, the first laser and the first control module, described first control module comprises: level conversion unit and the first control unit;
When described first optical module does not receive light signal or the intensity of light signal that receives lower than default light signal strength, described first optical module generates a SD signal of PECL level;
One SD signal of described PECL level is converted to a SD signal of Transistor-Transistor Logic level by described level conversion unit, and exports a SD signal of described Transistor-Transistor Logic level to described control unit;
The bias voltage of described first laser is embedded in 0V after receiving a SD signal of described TTL by described control unit, to close the function that described first laser sends FSO signal;
The FSO signal of reception is converted to light signal by described 2nd FSO equipment, and exports the downstream light device with described 2nd FSO equipment interconnection to;
When described 2nd FSO equipment do not receive FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, the function of described 2nd FSO equipment output optical signal is closed.
5. transmission method as claimed in claim 4, it is characterized in that, described 2nd FSO equipment comprises: the second receiver module, the second optical module and the second control module, and described second control module comprises: comparing unit, the second control unit and power subsystem;
When described 2nd FSO equipment do not receive FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, by the function of described 2nd FSO equipment output optical signal close step comprise:
When described second receiver module does not receive power voltage value that FSO signal or described comparing unit compare the FSO signal that described second receiver module receives lower than the power voltage threshold value preset, described second control unit generates the first index signal and exports described power subsystem to, controls described power subsystem by the power failure of described second optical module.
6. transmission method as claimed in claim 5, it is characterized in that, when described 2nd FSO equipment do not receive FSO signal or receive FSO signal intensity lower than preset FSO signal strength signal intensity time, by the function of described 2nd FSO equipment output optical signal close step after also comprise:
When described comparing unit compares the power voltage value of the FSO signal that described second receiver module receives higher than described default power voltage threshold value, described second control unit generates the second index signal;
When the index signal that described second control unit generates is transformed to the second index signal by the first index signal, described second control unit is when the time delay time limit of presetting arrives, export described second index signal to described power subsystem, control described power subsystem by the confession electric-opening of described second optical module.
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| 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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2012
- 2012-02-20 CN CN201210037893.8A patent/CN102571205B/en not_active Expired - Fee Related
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 |
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| CN102571205A (en) | 2012-07-11 |
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