CN101442374B - TDM optical network system, device and method for preventing signal collision - Google Patents
TDM optical network system, device and method for preventing signal collision Download PDFInfo
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Abstract
The invention relates to a device for preventing an upstream signal from colliding, which is suitable for a time division multiplexing passive optical network. The device comprises an optical coupling device, a photoelectric transducer, a control system and a photoelectric signal switching module, wherein the photoelectric transducer is coupled with the optical coupling device; the control system is coupled with the photoelectric transducer; and the photoelectric signal switching module is coupled with the optical coupling device and the control system. The optical coupling device is used for receiving a first optical signal and dividing the first optical signal into a second optical signal and a third optical signal. The photoelectric transducer is used for converting the second optical signal into a first electric signal; and the control system generates a control signal according to the first electric signal. The photoelectric signal switching module decides whether to block the third optical signal from passing through the device or not according to the control signal.
Description
Technical field
The present invention relates to a kind of time division multiplexing (Time DivisionMultiplexing that prevents signal collision; TDM) optical network system, devices and methods therefor; And particularly relate to a kind of time division multiplexing EPON (TDM Passive Optical Network, TDM PON) system, devices and methods therefor that prevents signal collision.
Background technology
Along with the increase of network user, volume of transmitted data is also along with increase.The technology that tradition uses the signal of telecommunication to carry out communication, because the restriction of the frequency range of the signal of telecommunication, with making network produce the phenomenon of being jammed.Therefore, many Internet Service Providers use optical-fibre communications to provide services on the Internet to the network user of various different demands.
The duty-cycle of optical fiber communication technology uses the wireless telecommunications of the signal of telecommunication or the frequency range of wire communication to be greater, and therefore can transmit more substantial data and to the user better network service is provided.Present Fiber Optical Communication System is used EPON more, and EPON uses passive block, and does not need a large amount of switching device shifters, therefore safeguards and goes up than being easier to also comparatively power saving in the use.At present; Many countries more are devoted to utilize optical fiber communication technology development fiber-to-the-home (Fiber to the Home; FFTH), fiber to the curb (Fiber to the Curb; FFTC) (Fiber to the Building, EPON FFTB) is so that network user can be fast and transmitted in a large number and the reception data with Fiber To The Building.Therefore, EPON has been played the part of the key player of present mechanics of communication.
In EPON; Each optical network unit (Optical Network Unit; ONU) apart from light path terminal machine (the Optical Line Termination of local side; OLT) distance is all different, and the transmission that therefore can lean on time-multiplexed mode to control to upload signal (general many light signals with 1310 nanometers) is to avoid the generation signals collision problem.Therefore, the optical transceiver of optical network unit (OpticalTransceiver) must be that the LASER Light Source of quick-fried punch die attitude (Burst Mode) could satisfy time-multiplexed transmission mode.If in its network the quick-fried punch die attitude of arbitrary optical network unit because of module problem becomes continuous mode (Continuous Wave Mode, CW Mode), then can make whole EPON paralysis.Because produce the problem of collision, so can't upload all signals of uploading.
Please refer to Figure 1A, Figure 1A shows the configuration diagram that traditional time-multiplexed EPON 100 is operated under normal condition.Shown in Figure 1A, this time-multiplexed EPON 100 comprises light path terminal machine 101, many optical fiber 102, optically coupled device 103 and a plurality of optical network units 1041～1044.Light path terminal machine 101 couples through optical fiber 102 and optically coupled device 103, and optically coupled device 103 couples through optical fiber 102 and a plurality of NEs 1041～1044.For under for the number of delivering a letter, optically coupled device 103 makes each optical network unit 1041～1044 can both receive down the number of delivering a letter in order to the number of delivering a letter is down made the function of beam split; For uploading signal, optically coupled device 103 usefulness are coupled the signal of uploading of each optical network unit 1041～1044, make the uploading signal and can successfully be uploaded to light path terminal machine 102 of each optical network unit 1041～1044.
Each optical network unit 1041～1044 is assigned to a time slot ts_1～ts_4 (timeslot); When optical network unit 1041 is uploaded data; Optical network unit 1041 must send light path terminal machine 101 in time slot ts_1, the rest may be inferred for 1042～1044 of other optical network units.So the LASER Light Source of optical network unit 1041～1044 must be operated at quick-fried punch die attitude.
Please refer to Figure 1B, Figure 1B shows the configuration diagram of traditional time-multiplexed EPON 100 under collision status.When external factor or other factor; For example: earthquake, the problem that optic module damages or other environment causes; The LASER Light Source that makes optical network unit 1043 by quick-fried when state changes over continuous state; Then can make the signal of uploading of uploading signal and optical network unit 1043 of different optical network units 1041,1042,1044 collide each other, therefore time-multiplexed transmission means will be destroyed, and makes time-multiplexed EPON 100 whole paralysis.
For fear of the situation of whole time-multiplexed EPON generation paralysis, U.S. publication 2005/0244160A1 has disclosed a kind of method and apparatus that opens or closes that uses the light path terminal machine to transmit each optical network unit of control signal control.Yet above-mentioned method must design the circuit of light path terminal machine again, and hardware complexity is high, does not meet the cost effect.
Summary of the invention
The device that the present invention provides a kind of prevention to upload signal collision is applicable to the time division multiplexing EPON, and this device simple in structure and with low cost can be prevented the time division multiplexing EPON because signal collision causes the situation of optical-fiber network paralysis.
The method that the present invention provides a kind of prevention to upload signal collision is applicable to the time division multiplexing EPON, uses the device of the method can prevent the time division multiplexing EPON because signal collision causes the situation of optical-fiber network paralysis.
The time division multiplexing passive optical network that the present invention also provides a kind of prevention to upload signal collision, the framework of this network system is made modification by a small margin through traditional time division multiplexing EPON, can accomplish.And this network system does not have the traditional passive optical-fiber network because of signal collision, and causes the situation of whole network system paralysis.
The present invention proposes the device that signal collision is uploaded in a kind of prevention; Be applicable to the time division multiplexing EPON; This device comprise optically coupled device (Optical Coupler), optical-electrical converter (Optic-ElectronConverter, O/E), control system, photosignal handover module.Wherein, optical-electrical converter is coupled to optically coupled device, and control system is coupled to optical-electrical converter, and photoelectric signal switching module is coupled to optically coupled device and control system.Optically coupled device is in order to receiving first light signal, and first light signal is divided into second light signal and the 3rd light signal.Optical-electrical converter is in order to converting second light signal into first signal of telecommunication, and control system produces control signal according to this first signal of telecommunication.Whether decision stops that the 3rd light signal is through this device to photoelectric signal switching module according to control signal.Wherein, if first signal of telecommunication surpasses setting-up time greater than time of threshold value, then photoelectric signal switching module stops that the 3rd light signal is through this device; If first signal of telecommunication does not surpass setting-up time greater than the time of threshold value, then photoelectric signal switching module allows the 3rd light signal through this device.
According to the described prevention of embodiments of the invention and upload the device of signal collision, above-mentioned photoelectric signal switching module comprises optical switch (Optical Switch) and resistance optical assembly.Optical switch has first output and second output, exports the 3rd light signal in first output or second output according to control signal.The resistance optical assembly is coupled to second output, in order to stop that the 3rd light signal is through this device.
The present invention proposes the method that signal collision is uploaded in a kind of prevention, is applicable to the time division multiplexing EPON.At first, first light signal is divided into second light signal and the 3rd light signal.Afterwards, convert second light signal into first signal of telecommunication again.Then, produce control signal according to first signal of telecommunication.At last, whether decision exports the 3rd light signal according to control signal.Wherein, if first signal of telecommunication surpasses setting-up time greater than time of threshold value, then the 3rd light signal is not exported in decision; If first signal of telecommunication does not surpass setting-up time greater than the time of threshold value, then decision output the 3rd light signal.
The time division multiplexing passive optical network that the present invention provides a kind of prevention to upload signal collision, this network system comprise light path terminal machine, first optically coupled device, a plurality of user's terminal equipment and many optical fiber.Wherein, these many optical fiber are in order to connecting the light path terminal machine and first optically coupled device, and connect first optically coupled device and a plurality of user's terminal equipment.Each user's terminal equipment comprises optical network unit and prevention signal collision device.Wherein, this prevention signal collision device is coupled to optical network unit, in order to receiving first light signal from optical network unit, and first light signal is divided into second light signal and the 3rd light signal, and determines whether to export the 3rd light signal according to second light signal.Above-mentioned prevention signal collision device comprises second optically coupled device, optical-electrical converter, control system, photosignal handover module.Wherein, optical-electrical converter is coupled to second optically coupled device, and control system is coupled to optical-electrical converter, and photoelectric signal switching module is coupled to second optically coupled device and control system.Second optically coupled device is in order to receiving first light signal, and first light signal is divided into second light signal and the 3rd light signal.Optical-electrical converter is in order to converting second light signal into first signal of telecommunication, and control system produces control signal according to this first signal of telecommunication.Whether decision stops that the 3rd light signal is through prevention signal collision device to photoelectric signal switching module according to control signal.Wherein, if first signal of telecommunication surpasses setting-up time greater than time of threshold value, then photoelectric signal switching module stops that the 3rd light signal is through prevention signal collision device; If first signal of telecommunication does not surpass setting-up time greater than the time of threshold value, then photoelectric signal switching module allows the 3rd light signal through prevention signal collision device.
According to the described network system of embodiments of the invention, above-mentioned photoelectric signal switching module comprises optical switch and resistance optical assembly.Optical switch has first output and second output, exports the 3rd light signal in first output or second output according to control signal.The resistance optical assembly is coupled to second output, in order to stop that the 3rd light signal is through prevention signal collision device.
The device that the present invention utilizes prevention to upload signal collision is controlled optical network unit, therefore can avoid the overall optical network to cause the situation of network paralysis because uploading signal collision.In addition, the above-mentioned prevention device of uploading signal has that framework is simple, with low cost, hardware complexity is low and the advantage that is easy to be integrated into optical network unit.
For make above and other objects of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and is described with reference to the accompanying drawings as follows.
Description of drawings
Figure 1A shows the configuration diagram that traditional time-multiplexed EPON 100 is operated under normal condition.
Figure 1B shows the configuration diagram of traditional time-multiplexed EPON 100 under collision status.
Fig. 2 A shows the system architecture diagram that TDM optical network system 200 embodiment of signal collision are uploaded in a kind of prevention.
Fig. 2 B shows the Organization Chart of the prevention signal collision device 2030 among Fig. 2 A.
Fig. 2 C shows the light signal sketch map of optical network unit 2031 when operating in quick-fried punch die attitude in the middle of Fig. 2 A.
Fig. 2 D shows optical network unit 2031 among Fig. 2 A when operating in continuous mode, the operation chart of optical switch 203A.
Fig. 2 E shows the light signal sketch map of optical network unit 2031 when operating in continuous mode among Fig. 2 A.
Fig. 3 A shows the embodiment Organization Chart of optical switch 203A.
Fig. 3 B shows the sketch map that light signal exports second output 2 of optical switch 203A to.
Fig. 3 C shows the sketch map that light signal exports first output 1 of optical switch 203A to.
Fig. 4 shows the flow chart of uploading the method for signal collision according to a kind of prevention of one embodiment of the invention.
Fig. 5 A shows when not having optical network unit to be in continuous mode in the optical-fiber network according to one embodiment of the invention, the eye pattern of light signal.
When Fig. 5 B shows arbitrary optical network unit according to one embodiment of the invention and is in continuous mode and causes the optical-fiber network paralysis, the eye pattern of light signal.
When Fig. 5 C shows arbitrary optical network unit according to one embodiment of the invention and is in continuous mode, adopt the eye pattern of the light signal of apparatus and method of the present invention.
Fig. 6 shows sketch map switching time according to the optical switch of one embodiment of the invention.
Fig. 7 shows according to the wrong probability of the following number of delivering a letter of one embodiment of the invention curve chart to received power.
The reference numeral explanation
100: time-multiplexed EPON
101: the light path terminal machine
102: optical fiber
103: optically coupled device
1041～1044: optical network unit
200: TDM optical network system
201: the light path terminal machine
202: optically coupled device
203～206: user's terminal equipment
207: optical fiber
2031,2041,2051,2061: optical network unit
2030,2040,2050,2060: prevention signal collision device
2035: optically coupled device
2036: optical-electrical converter
2037: control system
2038: photoelectric signal switching module
203A: optical switch
203B: resistance optical assembly
300: the formula that the latchs optical switch of MEMS
301: speculum moving up and down
S400～S403: steps flow chart
Embodiment
TDM optical network, devices and methods therefor that embodiments of the invention provide a kind of prevention to upload signal collision.
Please refer to Fig. 2 A, Fig. 2 A shows the system architecture diagram that TDM optical network system 200 embodiment of signal collision are uploaded in a kind of prevention.This network system 200 comprises light path terminal machine 201, optically coupled device 202, a plurality of user's terminal equipment 203～206 and many optical fiber 207.Wherein, these many optical fiber 207 are in order to connection light path terminal machine 201 and optically coupled device 202, and connection optically coupled device 202 and a plurality of user's terminal equipments 203～206.Optically coupled device 202 can be an optical coupler (Optical Coupler; OCP) or optical splitter (Optical Splitter; OS); Briefly, optically coupled device can be any assembly that reaches beam split and optical coupling function, and the execution mode of above-mentioned optical coupler or optical splitter is not in order to limit the present invention.
For under for the number of delivering a letter, optically coupled device 202 makes each user's terminal equipment 203～206 can both receive down the number of delivering a letter in order to the number of delivering a letter is down made the function of beam split; For uploading signal, optically coupled device 202 is coupled the signal of uploading of each user's terminal equipment 203～206, makes the uploading signal and can successfully be uploaded to light path terminal machine 201 of each user's terminal equipment 203～206.In this network system 200, user's terminal equipment 203～206 is assigned to time corresponding groove ts_1～ts_4, user's terminal equipment 203～206 can its time slot that is assigned to ts_1～ts_4 transmit the data that will transmit.
User's terminal equipment 203 comprises optical network unit 2031 and prevention signal collision device 2030.Wherein, This prevention signal collision device 2030 is coupled to optical network unit 2031; In order to be received from the light signal that optical network unit 2031 is transmitted; And the light signal that optical network unit 2031 is transmitted is divided into sensed light signal and data light signal, and whether determine the dateout light signal according to sensed light signal.The structure of user's terminal equipment 204～206 is identical with user's terminal equipment 203, so do not give unnecessary details.
If it is unusual that the optical network unit of user's terminal equipment 205 2051 takes place, make its transceiver be in continuous mode, then overall optical network 200 can't cause paralysis because optical network unit 2051 takes place unusual.Because; When optical network unit 2051 generations are unusual; Prevention signal collision device 2050 can constantly transmit light signal by block light NE 2051, so optical network unit 2031,2041 and 2061 can transmit the data that institute's tendency to develop is sent at its time corresponding groove ts_1, ts_2 and ts_4 respectively.
Then, please refer to Fig. 2 B, Fig. 2 B shows the Organization Chart of prevention signal collision device 2030.At this is example with prevention signal collision device 2030 only, and other prevention signal collision device 2040～2060 its frameworks are also identical.Prevention signal collision device 2030 comprise optically coupled device 2035, optical-electrical converter (Optic-Electron Converter, O/E) 2036, control system 2037 and photoelectric signal switching module 2038.Wherein, optical-electrical converter 2036 is coupled to optically coupled device 2035, and control system 2037 is coupled to optical-electrical converter 2036, and photoelectric signal switching module 2038 is coupled to optically coupled device 2035 and control system 2037.
Optically coupled device 2035 is received from the light signal that optical network unit 2031 is transmitted, and the light signal that optical network unit 2031 is transmitted is divided into sensed light signal and data light signal.Optical-electrical converter 2036 is in order to converting sensed light signal into the detection signal of telecommunication, and control system 2037 detects signal of telecommunication according to this and produces control signal.Photoelectric signal switching module 2038 determines according to control signal whether the block data light signal is through this prevention signal collision device 2030.
Shown in Fig. 2 B, photoelectric signal switching module 2038 comprises optical switch (Optical Switch, OS) 203A and resistance optical assembly 203B.Optical switch 203A has input 0, first output 1 and second output 2, and input 0 is coupled to optically coupled device 2035, the second outputs 2 and is coupled to resistance optical assembly 2038, the first outputs 1 and is coupled to optical fiber 207.In first output 1 or second output 2, resistance optical assembly 203B is in order to the block data light signal according to control signal dateout light signal for optical switch 203A.In addition, in this embodiment, the data light signal is the signal of uploading of 1310 nanometers, yet the wavelength of data light signal is not in order to limit the present invention.
Under the normal condition, the optical network unit 2031 of Fig. 2 B operates in quick-fried punch die attitude, and the data light signal should successfully be exported to optical fiber 207, so optical switch 203A delivers to first output 1 with the light data-signal by input 0.In addition, above-mentioned optically coupled device 2035 can be to use the optical coupler that slab guide technology (PLC) or waveguide (Waveguide) realize (Optical Coupler, OCP) or optical splitter (Optical Splitter).And optical-electrical converter 2036 can be realized with photodiode; General photodiode has positive pole-pure matter-negative pole to meet face photodiode (Positive-Intrinsic-Negative Photodiode; PIN Photodiode), tired avalanche photodide (the Avalanche Photodiode that increases; APD) connect these three kinds of face photodiode (Metal-Semiconductor-Metal Photodiode, MSM Photodiode) with metal-semiconductor-metal.
Above-mentioned optical-electrical converter 2036, optically coupled device 2035 are not in order to qualification the present invention with the execution mode of photoelectric signal switching module 2038, and optical-electrical converter 2036, optically coupled device 2035 still have other execution mode to reach identical functions with photoelectric signal switching module 2038.In brief, above-mentioned Fig. 2 B only is a kind of embodiment, is not in order to limit the present invention, and is all in spirit of the present invention, when in protection scope of the present invention.
Please refer to Fig. 2 C, Fig. 2 C shows the light signal sketch map of optical network unit 2031 when operating in quick-fried punch die attitude.When optical network unit 2031 operated in quick-fried punch die attitude, the time τ that its light signal captures channel was the sum total of opening (turn on) time C00, shut-in time C02 and data transmission period C01 of its laser.Generally speaking, the standard of just present EPON, the common meeting of τ is less than the time of a plurality of microseconds, and this moment, above-mentioned optical switch 203A can deliver to optical fiber 207 toward first output 1 with the data light signal, so that its optical-fiber network 200 can normally link.
Please refer to Fig. 2 D and 2E, Fig. 2 D shows optical network unit 2031 when operating in continuous mode, the operation chart of optical switch 203A; Fig. 2 E shows the light signal sketch map of optical network unit 2031 when operating in continuous mode.When optical network unit 2031 when operating in continuous mode; Its laser is after opening; Just can not close, so the time τ ' that its light signal captures channel is the summation of the time of opening E00 and the time E01 that laser continues to open of its laser that this moment, τ ' understood the time much larger than a plurality of microseconds.Prevention signal collision device 2030 can pass through by the block data light signal, and does not allow overall optical network 200 to present the state of paralysis, and therefore, optical switch 203A can deliver to its second output 2 with the data light signal, and resistance optical assembly 203B can block the data light signal.Principle of its prevention optical-fiber network 200 paralysis is that control system 2037 judges whether the detection signal of telecommunication that receives surpasses setting-up time greater than the time of threshold value; When optical network unit 2031 is in continuous mode; This moment, laser can continuous emission be uploaded signal; The detection signal of telecommunication can surpass setting-up time greater than the time of threshold value, and then photoelectric signal switching module 2038 can export optical fiber 207 to according to control signal block data light signal, and wherein setting-up time can be greater than τ; When optical network unit 2031 is in quick-fried punch die attitude; This moment, laser only can emission be uploaded signal in the time of τ; Therefore detecting the signal of telecommunication can be less than setting-up time greater than time of threshold value, and light signal switches mould and determines and 2038 can allow the data light signals export optical fiber 207 to.
Optical switch 203A can be the formula that the latchs optical switch or the semiconductor optical amplifier switch (Semiconductor Optical Amplifier Switch, SOA Switch) of MEMS.Please refer to Fig. 3 A, 3B and 3C, Fig. 3 A shows the embodiment Organization Chart of optical switch 203A, and Fig. 3 B shows the sketch map that light signal exports second output 2 to, and Fig. 3 C shows the sketch map that light signal exports output 1 to.The optical switch 203A of Fig. 3 A～3B utilizes the formula that the latchs optical switch 300 of MEMS to implement, and this optical switch 300 comprises a speculum 301 moving up and down, and control signal can be controlled moving of this speculum 301.Please refer to Fig. 3 B, when control signal control speculum 301 up moved, speculum 301 can be with data light signal reflex to the second output 2; Please refer to Fig. 3 C, when control signal control speculum 301 moved down, the data light signal can directly be passed to first output 1.
Though above-mentioned optical switch 203A utilizes the formula that the latchs optical switch 300 of MEMS to implement, be not in order to limit the present invention.In other words, other execution mode that can reach optical switch 203A function is also when in protection scope of the present invention.
Please refer to Fig. 4, Fig. 4 shows the flow chart of uploading the method for signal collision according to a kind of prevention of one embodiment of the invention, and the method is applicable to the time division multiplexing EPON.The method at first is divided into data light signal and sensed light signal (step S400) with the light signal that optical network unit transmitted.Afterwards, convert sensed light signal into the detection signal of telecommunication (step S401) again.Then, produce control signal (step S402) according to detecting the signal of telecommunication.At last, whether determine dateout light signal (step S403) according to control signal.Wherein, if the intensity that detects the signal of telecommunication surpasses setting-up time greater than time of threshold value, then the data light signal can be blocked, and can not be outputed on the optical-fiber network, thereby can realize preventing to upload the mechanism of signal collision.In addition, above-mentioned setting-up time and threshold value can adjust because of different demands and system.
Then please refer to Fig. 5 A, 5B and 5C, Fig. 5 A shows when not having optical network unit to be in continuous mode in the optical-fiber network of one embodiment of the invention, the eye pattern of light signal; When Fig. 5 B shows among this embodiment arbitrary optical network unit and is in continuous mode and causes the optical-fiber network paralysis, the eye pattern of light signal; When Fig. 5 C shows among this embodiment arbitrary optical network unit and is in continuous mode, adopt the eye pattern of the light signal of apparatus and method of the present invention.In the above-mentioned optical-fiber network, the total distance from the light path terminal machine to optical network unit is about 20 kilometers, and its light signal that passes up and down can be gone through one 1 * 8 optical splitter.The LASER Light Source of wavelength 1490 nanometers and 1310 nanometers is done respectively as descending and the LASER Light Source of uploading signal.The mode that this optical-fiber network uses 1.25Gbps directly to modulate is carried out the light signal modulation, and (Non-Return-to-Zero, (Pseudo Random BinarySequence, PRBS) pattern produces 2 to pseudo-random binary sequences NRZ) to utilize non-return-to-zero
31-1 position measure its overall optical network the error rate (BitError Rate, BER).
Shown in Fig. 5 A, when having no optical network unit to be in continuous mode, (Extinction Ratio, ED) value also can be greater than more than the 10dB for quite complete and its extinction coefficient of the eye pattern that it showed (Eye Diagram).When certain optical network unit is in continuous mode, then cause the light path terminal machine after receiving signal because of the signal collision problem, what then receive uploads signal with serious distortion.Shown in Fig. 5 B, at this moment, because the relation of signal collision, its eye pattern is poor in the extreme, and its extinction coefficient almost measure less than.The input power of the optical network unit of Fig. 5 B when continuous mode be-30dBm about, its power is very little, if exceed this power, it is poorer that the eye pattern of its signal will become.Can't be uploaded to optical-fiber network to avoid the optical-fiber network paralysis as if the light signal that adopts above-mentioned prevention to upload the optical-fiber network of the apparatus and method of signal collision, then can let the optical network unit that is in continuous state.Shown in Fig. 5 C, can't be uploaded to optical-fiber network because be in the light signal of the optical network unit of continuous state, so perfect in the extreme at the received eye pattern of uploading signal of light path terminal machine.
Then, please refer to Fig. 6 and Fig. 7, Fig. 6 shows sketch map switching time of the optical switch of one embodiment of the invention, and Fig. 7 shows the curve chart of the following number of the delivering a letter bit-errors probability of one embodiment of the invention to received power (Received Power).As shown in Figure 6, in Fig. 5 A～5C, the reaction time of the optical switch in the optical network system approximately is 7 milliseconds.As shown in Figure 7, the error rate curve chart of the back-to-back transmission of the curve representation of circular mark (back to back); The curve representation of rhombus mark is uploaded signal collision, but does not do the error rate curve chart that signal collision is uploaded in any prevention; And the curve representation of square mark is uploaded signal collision, and the error rate curve chart of signal collision device or method is uploaded in the prevention of use present embodiment.Can be known that by Fig. 7 no matter whether protection mechanism starts to some extent, as far as the following number of delivering a letter of 1490 nanometers, the power loss that it produced (power penalty) equals under the 10-9 at BER, not too big increase is approximately less than 0.2dB.Therefore, device, network system and method thereof proposed by the invention can't let down the usefulness of the number of delivering a letter significantly decrease.
In sum, uploading signal collision device, optical network system and method thereof in prevention provided by the present invention can avoid the overall optical network to cause the situation of network paralysis because uploading signal collision.In addition, above-mentioned device has the advantage that framework is simple, with low cost, hardware complexity low and be easy to be integrated into optical network unit.
Though the present invention discloses as above with embodiment; Right its is not in order to qualification the present invention, those skilled in the art, under the premise without departing from the spirit and scope of the present invention; When can doing some changes and modification, so protection scope of the present invention should be as the criterion with claim of the present invention.
Claims (16)
1. the device of signal collision is uploaded in a prevention, is applicable to the time division multiplexing EPON, comprising:
One optically coupled device in order to receiving one first light signal, and is divided into one second light signal and one the 3rd light signal with this first light signal;
One optical-electrical converter is coupled to this optically coupled device, in order to convert this second light signal into one first signal of telecommunication;
One control system is coupled to this optical-electrical converter, in order to produce a control signal according to this first signal of telecommunication; And
One photoelectric signal switching module is coupled to this optically coupled device and this control system, and whether decision stops that the 3rd light signal uploads the device of signal collision through this prevention according to this control signal,
Wherein if this first signal of telecommunication surpasses a setting-up time greater than time of a threshold value, then this photoelectric signal switching module stops that the 3rd light signal uploads the device of signal collision through this prevention; If this first signal of telecommunication does not surpass this setting-up time greater than the time of this threshold value, then this photoelectric signal switching module allows the 3rd light signal to upload the device of signal collision through this prevention.
2. the device of signal collision is uploaded in prevention as claimed in claim 1, comprises that also an optical network unit is coupled to this optically coupled device, in order to this first light signal to be provided.
3. the device of signal collision is uploaded in prevention as claimed in claim 1, and wherein, this optical-electrical converter comprises a photodiode.
4. the device of signal collision is uploaded in prevention as claimed in claim 3, and wherein this photodiode comprises that a positive pole-pure matter-negative pole connects face photodiode, and tired increases avalanche photodide or a metal-semiconductor-metal connects the face photodiode.
5. the device of signal collision is uploaded in prevention as claimed in claim 1, and wherein, this photoelectric signal switching module comprises:
One optical switch has one first output and one second output, exports the 3rd light signal in this first output or this second output according to this control signal; And
One resistance optical assembly is coupled to this second output, uploads the device of signal collision through this prevention in order to stop the 3rd light signal.
6. the device of signal collision is uploaded in prevention as claimed in claim 5, and wherein this optical switch is the formula that the latchs optical switch or the semiconductor optical amplifier switch of a MEMS.
7. the method for signal collision is uploaded in a prevention, is applicable to the time division multiplexing EPON, comprising:
One first light signal is divided into one second light signal and one the 3rd light signal;
Convert this second light signal into one first signal of telecommunication;
Produce a control signal according to this first signal of telecommunication; And
Whether export the 3rd light signal according to this control signal decision,
Wherein, if this first signal of telecommunication surpasses a setting-up time greater than time of a threshold value, then the 3rd light signal is not exported in decision; If this first signal of telecommunication does not surpass this setting-up time greater than the time of this threshold value, then decision output the 3rd light signal.
8. the method for signal collision is uploaded in prevention as claimed in claim 7, wherein, one first light signal is divided into one second light signal and one the 3rd light signal is through an optically coupled device this first signal to be divided into this second light signal and the 3rd light signal.
9. the method for signal collision is uploaded in prevention as claimed in claim 7, and wherein, converting this second light signal into one first signal of telecommunication is to convert this second light signal into this first signal of telecommunication through a photodiode.
10. the method for signal collision is uploaded in prevention as claimed in claim 7, and wherein, producing a control signal according to this first signal of telecommunication is to produce this control signal through a control system according to this first signal.
11. the method for signal collision is uploaded in prevention as claimed in claim 7, wherein, whether exporting the 3rd light signal according to this control signal decision is whether to export the 3rd light signal through a photoelectric signal switching module according to this control signal decision.
12. the time division multiplexing passive optical network of signal collision is uploaded in a prevention, comprising:
One light path terminal machine;
One first optically coupled device is in order to beam split and coupling;
A plurality of user's terminal equipments, wherein, each user's terminal equipment comprises:
One optical network unit; And
The signal collision device is uploaded in one prevention; Be coupled to this optical network unit; Receive one first light signal in order to this optical network unit certainly, and this first light signal is divided into one second light signal and one the 3rd light signal, and whether export the 3rd light signal according to this second light signal decision; And
Many optical fiber in order to connecting this light path terminal machine and this first optically coupled device, and connect this first optically coupled device and said user's terminal equipment,
Wherein, this prevention is uploaded the signal collision device and is comprised:
One second optically coupled device is coupled to this optical network unit, in order to receiving this first light signal, and this first light signal is divided into this second light signal and the 3rd light signal;
One optical-electrical converter is coupled to this second optically coupled device, in order to convert this second light signal into one first signal of telecommunication;
One control system is coupled to this optical-electrical converter, in order to produce a control signal according to this first signal of telecommunication; And
One photoelectric signal switching module is coupled to this second optically coupled device and this control system, whether exports the 3rd light signal according to this control signal decision,
Wherein if this first signal of telecommunication surpasses a setting-up time greater than time of a threshold value, then this photoelectric signal switching module stops that this prevention uploads signal collision device output the 3rd light signal; If this first signal of telecommunication does not surpass this setting-up time greater than the time of this threshold value, then this photoelectric signal switching module allows the 3rd light signal to upload the signal collision device through this prevention.
13. the time division multiplexing passive optical network of signal collision is uploaded in prevention as claimed in claim 12, wherein, this optical-electrical converter comprises a photodiode.
14. the time division multiplexing passive optical network of signal collision is uploaded in prevention as claimed in claim 13, wherein this photodiode comprises that a positive pole-pure matter-negative pole connects face photodiode, and tired increases avalanche photodide or a metal-semiconductor-metal connects the face photodiode.
15. the time division multiplexing passive optical network of signal collision is uploaded in prevention as claimed in claim 12, wherein, this photoelectric signal switching module comprises:
One optical switch has one first output and one second output, exports the 3rd light signal in this first output or this second output according to this control signal; And
One resistance optical assembly is coupled to this second output, in order to stop that the 3rd light signal is through this device.
16. the time division multiplexing passive optical network of signal collision is uploaded in prevention as claimed in claim 15, wherein this optical switch is the formula that the latchs optical switch of a MEMS.
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| CN102725847B (en) * | 2011-12-29 | 2014-12-03 | 华为技术有限公司 | Integrated detector, and detecting method thereof, optical module and optical network system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1311137A2 (en) * | 2001-11-10 | 2003-05-14 | Samsung Electronics Co., Ltd. | Gigabit ethernet passive optical network system and media access control method for the same |
| CN101018090A (en) * | 2006-02-09 | 2007-08-15 | 华为技术有限公司 | Device and method for detecting the light receiving power in the optical communication network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1311137A2 (en) * | 2001-11-10 | 2003-05-14 | Samsung Electronics Co., Ltd. | Gigabit ethernet passive optical network system and media access control method for the same |
| CN101018090A (en) * | 2006-02-09 | 2007-08-15 | 华为技术有限公司 | Device and method for detecting the light receiving power in the optical communication network |
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