CN1859043A - Loading, detecting and monitoring method for optical associated channel signal and its realizing device - Google Patents
Loading, detecting and monitoring method for optical associated channel signal and its realizing device Download PDFInfo
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Abstract
This invention provides a loading, testing and monitoring method for optical associated signals and its device, in which, the loading method includes: A1, distributing different time slots for loaded points, A2, each loaded point sends optical identification signals at the corresponding distribution time slot, the test method includes: B1, splitting the optical signals into two paths of signals, B2, converting a path of optical signals to corresponding electric signals, B3, separating the electric signals and picking up the identification signals from them.
Description
Technical field
The present invention relates to a kind of communication system cursor and know signal method and implement device thereof, in particular, a kind of loading of optical associated channel signal, detection and method for supervising and implement device thereof.
Background technology
The progress of optical device has greatly promoted the development of optical communication.Along with reconfigurable optical device such as wavelength blocker (WB, Wavelength Blocker), wavelength selectivity interleaver (WSS, WavelengthSelectvie Switching) maturation makes up the optical transfer network of handling based on the full light signal possibility that become a reality.But because the transparency of light signal, it can't carry with the road Overhead.And lacking support with the road expense, quality that on the one hand can't the complete monitoring light signal can't be made corresponding treatment measures according to RST; On the other hand, the mistake connection that source that can't sensed light signal and whereabouts may occur to evade light signal, can't be according to light signal with the road expense light signal is carried out heavy-route or other processing.Therefore, the light signal that lacks with the road expense can't make up and can transmit net with the carrier class that the signal of telecommunication matches in excellence or beauty.
G.709, standardization department of international telecommunication union telecommunication (ITU-T) is proposing control method outside the band in the standard, promptly transmit the information of different optical channels, to realize management, maintenance function to different light signals by outer OSC (the Optical Supervisory Channel) passage of a band.But, be with the outer OSC passage only can the transmitting portions Overhead, processing capacity such as can only realize that route, protection to light signal switched can't realize the monitoring to optical signal quality, performance, whether optical signal quality satisfies the demands can't be confirmed.And, be with outer OSC passage only to transmit expense, whether the reconfigurable optical device is really finished the route of light signal can't obtain confirming to the specified routing of light signal action.And OSC passage faults itself also can bring out the processing to light signal, though the OSC passage can strengthen reliability by backup policy, this can bring extra cost and complexity.
In being the United States Patent (USP) " Method and Apparatus forMonitoring Performance of Optical Transmission System " of US5513029, the patent No. mentioned a kind of method of monitor optical signal quality.By on the Laser Drive signal of each wavelength conversion unit, increasing a low-frequency excitation signal, this low-frequency excitation signal can be modulated on the laser output signal, thereby the pairing id signal of this low-frequency excitation signal is loaded on the wavelength signals.Low-frequency excitation signal modulation depth is known, and is because low-frequency excitation signal modulation depth is generally less than 10%, less to the influence of main optical path.In the control point, by the reception of LF receiver to light signal, filtering goes out the low-frequency excitation signal.Because the component of low-frequency excitation signal and main optical business signal is than being constant, therefore can be by detecting the power that the low-frequency excitation input goes out the corresponding wavelength light signal, in conjunction with the measurement of overall optical power, can also extrapolate the information such as Optical Signal To Noise Ratio of corresponding wavelength light signal.Though US5513029 can realize the monitoring of optical signal quality, it has several shortcomings: 1, different wave length must use different frequencies to identify, and frequency interval must be greater than the frequency discrimination degree of control point, and therefore available id signal is very limited; Though 2 low-frequency excitation signals are little to the influence of main optical business signal quality, the low-frequency excitation signal still has certain influence to the main optical business signal; 3, must pre-configured wavelength signals and the corresponding relation of low frequency signal, otherwise which wavelength light signal what can't know monitoring is; 4, this method can't be carried with the road expense, and protection is switched and other routing order and other indication information all must solve by alternate manner.
In United States Patent (USP) " Channel Identitification in Communications Networks ", mention another method (publication number is US20030067646, US20030067647, US20030067651), be used for solving the subproblem of US5513029.This method has only a frequency sign by identifying same wavelength signals with two or more frequencies on this wavelength of different time.Identify and the time correlation by detecting frequency in the control point, can judge that there is situation in wavelength, and can infer corresponding wavelength power and Optical Signal To Noise Ratio optical signal quality situations such as (OSNR, Optical Signal to Noise Ratio) by the power behind the time average.Because this method has used a plurality of frequencies to identify same wavelength signals, therefore have under the situation of same usable frequency point, realize than the more identification function of US5513029.But still there is following shortcoming in this method: 1, the low frequency signal energy is more concentrated, and the main optical business signal is still had certain influence; 2, the corresponding relation between frequency sign and the wavelength still must be pre-configured, to determine which light signal the detected light signal in control point is; 3, can't carry with the road Overhead, the protection of professional light signal is switched, routing and other indication information still need to solve by alternate manner.
At application number is to have mentioned another method in 98804006.9 the Chinese patent " transmission method that additional data signal and useful data signal are connected through optics ", the additional data signal is carried out forming spread-spectrum signal after certain spread processing, superpose with less amplitude and useful data-signal afterwards, after receiving terminal receives data-signal, earlier finish separating of spread-spectrum signal and useful data signal with the frequency domain separate mode, spread spectrum data solves original additional data signal after cross correlation process.This method has solved the transmission problem with the road expense, but how optical signal quality monitoring, different identification problem such as are distinguished and still be not resolved.
At present, the known signal multiplex mode has three kinds of TDMA, FDMA, CDMA, and WDM (WavelengthDivision Multiplexing) belongs to a kind of among the FDMA.The patent of US5513029 and US20030067646, US20030067647, US20030067651 has all adopted the FDMA method, different know signal with the road cursor and adopted different frequencies or different Frequency points to make up to represent and a plurality ofly know signal with the road cursor, the mixing of finishing a plurality of marking signals by frequency division multiplexing and demultiplexing with separate, but these methods are all just like preceding described shortcoming.Though the CDMA method has multiple advantages such as power spectral density is low, antijamming capability is strong, and can realize the multiplexing of a plurality of marking signals, but realize comparatively complexity, and for the optical communication system of intensity modulated with the unipolarity coding that directly detects, coding is much restrictions in addition.For digital system, adopt TDMA multiplexing PDH (Plesiochronous DigitalHierarchy), SDH (Synchronous Digital Hierarchy), SONET (SynchronousOptical Network), OTN (Optical transport network) etc. are arranged, the core of TDMA is exactly to have checked low speed signal multiplexing to high speed signal by bit, byte etc.For knowing signal method with the road cursor, different adds on difference or different light signal with the line signal, therefore can't directly adopt the TDMA method.
In all optical network; requirement can add extra with the road Overhead at different transmission point; and can after the control point extract this Overhead; this Overhead requires to finish the monitoring of optical signal quality; and can carry the signaling of transmitting with the road; such as being used to protect APS (the AutomticProtection and Switching) signaling of switching; OSPF (the Open Shortest PathFirst) message that is used for heavy-route, and other may be used to indicate the information such as source node ID, destination node ID of light signal source and termination.But up to the present, prior art still can not solve above-mentioned all problems simultaneously.
Therefore, there is defective in prior art, needs to improve.
Summary of the invention
The object of the present invention is to provide a kind of loading, detection and method for supervising and implement device and application system of optical associated channel signal.At the existing deficiency that exists with road monitoring and expense transmission method, can add extra at different transmission point with the road Overhead, and can after the control point extract this Overhead, can finish the monitoring of optical signal quality and the signaling that carrying is transmitted with the road, and other may be used to indicate the information such as source node ID, destination node ID of light signal source and termination.
Technical scheme of the present invention is as follows:
A kind of optical associated channel signal loading method comprises step: A1, be that load(ing) point distributes different time slots; A2, described load(ing) point distribute time slot to send cursor knowledge signal at it.
Described method, wherein, described distribution time slot method is a static allocation or by token mode dynamic assignment.
Described method, wherein, described static allocation is that periodically time slot allocation relation is set.
Described method wherein, describedly refers to that by token mode dynamic assignment described load(ing) point just sends cursor and knows signal after obtaining allowing the token of the information that sends.
Described method, wherein, life period interval between the id signal that different load(ing) point sent, the described time interval is used to avoid identification collision.
Described method, wherein, described id signal is the frame signal with certain format.
Described method, wherein, described frame signal with certain format comprises frame preorder, frame head, frame load, postamble.
Described method, wherein, described id signal also comprises the pairing id information of described load(ing) point, and described id information is used to discern described cursor and knows the pairing load(ing) point of signal.
Described method, wherein, the signal period of described cursor knowledge signal is more than or equal to ten times of the described service signal cycle.
Described method, wherein, the modulation depth that described cursor is known signal is not more than 10%.
Described method, wherein, by monitoring institute load signal, the further control loaded time and the loading degree of depth.
Described method, wherein, described loading method further comprises spread processing, promptly with the pairing unique identifier of described load(ing) point described id signal is carried out spread processing before id signal is loaded into light signal.
A kind of optical associated channel signal detection method comprises step: B1, the light signal merit is divided into two ways of optical signals at least; B2, road light signal after described merit divided carry out opto-electronic conversion and obtain the corresponding signal of telecommunication; B3, separation and Extraction goes out wherein id signal from the described signal of telecommunication.
Described method, wherein, described separation is to adopt DC-isolation method and low frequency filtering method.
Described method further comprises step: D1, detects described id signal and whether adopt spread processing, otherwise execution in step D2 not; D2, with given orthogonal code id signal is carried out despreading and handle, extract identification information wherein.
Described method further comprises step: described id signal is carried out Optical Signal To Noise Ratio detection, load(ing) point identification or power detection.
Described method, wherein, described load(ing) point identification comprises: detect described id signal and whether comprise id information, described id information is used to discern described cursor and knows the pairing load(ing) point of signal.
A kind of optical associated channel signal method for supervising comprises step: E1, each load(ing) point load cursor at different time slots and know signal; E2, detect described cursor in the control point and know signal, be used for the monitor optical signal.
Described method, wherein, described step e 1 comprises step: A1, be that load(ing) point distributes different time slots; A2, described load(ing) point distribute time slot to send cursor knowledge signal at it.
Described method, wherein, described distribution time slot method is a static allocation or by token mode dynamic assignment.
Described method, wherein, described static allocation is that the time slot allocation relation periodically is set.
Described method wherein, describedly refers to that by token mode dynamic assignment described load(ing) point just sends cursor and knows signal after obtaining allowing the token of the information that sends.
Described method, wherein, different load(ing) points between the id signal that sent life period at interval, the described time interval is used to avoid identification collision.
Described method, wherein, described loading method further comprises spread processing, promptly with the pairing unique identifier of described load(ing) point described id signal is carried out spread processing before id signal is loaded into light signal.
Described method, wherein, described id signal is the frame signal with certain format.
Described method, wherein, described frame signal with certain format comprises frame preorder, frame head, frame load, postamble.
Described method, wherein, described id signal also comprises the pairing id information of described load(ing) point, and described id information is used to discern described cursor and knows the pairing load(ing) point of signal.
Described method, wherein, the signal period of described cursor knowledge signal is more than or equal to ten times of the described service signal cycle.
Described method, wherein, the modulation depth that described cursor is known signal is not more than 10%.
Described method, wherein, described step e 2 comprises step: B1, the light signal merit is divided into two ways of optical signals at least; B2, road light signal after described merit divided carry out opto-electronic conversion and obtain the corresponding signal of telecommunication; B3, separation and Extraction goes out wherein id signal from the described signal of telecommunication.
Described method, wherein, described separation is to adopt DC-isolation method and low frequency filtering method.
Described method, whether the signal that further comprise step: D1, detects described sign adopts spread processing, otherwise execution in step D2 not; D2, handle, extract identification information wherein with specifying orthogonal code that id signal is carried out despreading.
Described method wherein, further comprises: described id signal is carried out Optical Signal To Noise Ratio detection, load(ing) point identification or power detection.
Described method, wherein, described load(ing) point identification comprises: detect described id signal and whether comprise id information, described id information is used to discern described cursor and knows the pairing load(ing) point of signal.
A kind of optical associated channel signal checkout gear, it comprises power splitter, photoelectric conversion unit, id signal unit; Wherein: described power splitter is used for the light signal merit is divided into two ways of optical signals at least; Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication; Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
Described checkout gear wherein, further comprises the despreading assembly, is used for that the id signal that obtains by spread processing is carried out despreading and handles and transfer to id signal unit extraction identification information wherein.
Described checkout gear, wherein, described despreading assembly comprises orthogonal code generator and despread unit.
Described checkout gear, wherein, it also comprises the overhead processing unit, and what be used for described id signal is carried handles with the road expense, is describedly obtained by described id signal cell processing id signal with the road expense.
A kind of charger of optical associated channel signal, wherein, it comprises overhead processing unit, id signal unit and loading unit; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal.
Described charger, wherein, described distribution time slot method comprises static allocation or by token mode dynamic assignment.
Described charger, wherein, described charger also comprises orthogonal code generator and spectrum-spreading unit, and described orthogonal code generator is used to produce the pairing unique orthogonal code of present node, and described orthogonal code is passed to spectrum-spreading unit.
Described charger, it also comprises a checkout gear, described checkout gear is used for detected id signal is fed back to the id signal unit of described charger, and the id signal unit of described charger is used to control the load time of described loading unit and loads the degree of depth; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal.
Described charger, wherein, described checkout gear further comprises a despreading assembly, is used for going out described id signal from described signal of telecommunication despreading.
A kind of system of monitor optical channel associate signals pools one tunnel key signal by a plurality of branch road light signals, and wherein: branch node comprises charger, and key signal node comprises checkout gear; Described charger is used for loading the light signal sign at different time slots; Described checkout gear is used for the sensed light signal sign; Wherein:
Described charger comprises overhead processing unit, id signal unit and loading unit; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal;
Described checkout gear comprises power splitter, photoelectric conversion unit, id signal unit; Wherein: described power splitter is used for the light signal merit is divided into two ways of optical signals at least; Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication; Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
A kind of system of monitor optical signal identification, wherein, a plurality of nodes are formed a chain network, at described node charger and/or checkout gear are set; Described charger is used for loading the light signal sign at different time slots; Described checkout gear is used for the sensed light signal sign; Wherein:
Described charger comprises overhead processing unit, id signal unit and loading unit; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal;
Described checkout gear comprises power splitter, photoelectric conversion unit, id signal unit; Wherein: described power splitter is used for the light signal merit is divided into two ways of optical signals at least; Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication; Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
Adopt such scheme, the present invention not only can be used to identify, load and detect different light signals, the monitor optical signal quality, can also be used to carry comprise message such as signaling, ID indication interior with the road expense.Thereby reduced the detection difficulty of id signal and realized cost; In conjunction with spread spectrum, also can support higher accuracy of detection, littler to the interference and the influence of main optical path signal; By transmitting upstream information exactly, the transmission and the identification of id information have also been realized under the no configuration scenario with the road expense; Can detect the relevant information of main optical signal by id signal, accurately the degradation of framing signal has increased the method for judging the network deterioration.Simultaneously, the present invention also provides the device and the system that realize.
Description of drawings
Fig. 1 is the flow chart of loading method of the present invention;
Fig. 2 is time slot allocation of the present invention and id signal schematic diagram in time;
Fig. 3 is that a kind of id signal of the present invention loads schematic diagram;
Fig. 4 is that another kind of id signal of the present invention loads schematic diagram;
Fig. 5 is the flow chart of detection method of the present invention;
Fig. 6 is that test point of the present invention realizes detecting schematic diagram;
Fig. 7 is that checkout gear of the present invention is formed schematic diagram;
Fig. 8 is that charger of the present invention is formed schematic diagram;
Fig. 9 is a kind of charger schematic diagram with negative feedback control of the present invention;
Figure 10 is the charger schematic diagram of another kind of band negative feedback control of the present invention;
Figure 11 is an Application Example of the present invention;
Figure 12 is another application of the invention embodiment.
Embodiment
Below preferred embodiment of the present invention is described in detail.
The invention provides a kind of loading method of optical associated channel signal, as shown in Figure 1, it comprises step: A1, be that load(ing) point distributes different time slots; A2, described load(ing) point distribute time slot to send cursor knowledge signal at it.Described distribution time slot method is static allocation or dynamic assignment.
At first, distribute different time slot A 1 for load(ing) point; Can make each load(ing) point all have a different time slot for each load(ing) point distributes time slot.Life period interval between the id signal that different load(ing) points are sent, the described time interval is used to avoid identification collision.Because also there is certain time-delay each other in load(ing) point, therefore when time slot allocation, can leave certain slot time in advance, load(ing) point does not load id signal in slot time, allow each load(ing) point to have the regular hour surplus to load sign like this, avoid time slot adjacent sign to overlap, bring out conflict, thereby can reduce synchronous requirement, reduce and realize cost load(ing) point.By being the different time slots of different load(ing) points distribution, control different load(ing) points and load sign at different time, by time slot preassignment or token mechanism, what guarantee that different load(ing) point loads can not occur at the same time with the line signal, thereby has realized the time division multiplexing of mark.
The emphasis of time slot allocation scheme is to prevent to produce conflict between the load(ing) point, and concrete time slot allocation can be according to the preassignment of how much carrying out of load(ing) point.For example take static assignment, described static allocation is that periodically time slot allocation relation, i.e. cycle assignment time slot are set; As shown in Figure 2, by a samsara time slot is distributed, time slot 1 is distributed to load(ing) point 1, time slot 2 is distributed to load(ing) point 2 ... time slot N distributes to load(ing) point N, after all load(ing) points all distribute, time slot N+1 distributes to load(ing) point 1 once more, so moves in circles, and guarantees that each load(ing) point can obtain a time slot in one-period.
The time slot allocation scheme can be taked static assignment, also can take Dynamic Assignment.Dynamic Assignment can be by token mode dynamic assignment, and promptly described load(ing) point just sends cursor and knows signal after obtaining allowing the token of the information that sends.Each load(ing) point all can be waited for a token, after load(ing) point is received token, could send sign, and it discharges token after sending message, pass token to other load(ing) point, sends sign by other load(ing) point.Token also can transmit by identifying itself.Token Control mechanism is introduced in IEEE802.5 in detail, does not repeat them here.
Secondly, second step of the present invention is that described load(ing) point distributes time slot to send cursor knowledge signal A2 at it.Its method can be that each load(ing) point begins to send id signal in distributing to the slot time of oneself; Described id signal is the frame signal with certain format.Described frame signal with certain format comprises frame preorder, frame head, frame load, postamble.Wherein the frame preorder is used to extract clock information, realizes quick clock synchronization; Frame head includes the physical address of start mark, the receiving-transmitting sides of frame, the corresponding control information etc. of needs when transmitting; The frame load is a frame institute data carried by data information; Postamble comprises the end mark of Frame Check Sequence and frame etc., has comprised in the Frame Check Sequence the inspection message of not makeing mistakes is arranged in the network information transmittance process.
Simultaneously, described id signal also comprises the pairing id information of described load(ing) point, and described id information is used to discern described cursor and knows the pairing load(ing) point of signal.Described id information can be included in the frame signal.
The sign sending method has multiple mode, a kind of is to send sign by modulator, and as shown in Figure 3, the main optical signal that promptly at first needs is added sign is linked in the modulator inlet, remove to control modulator with id signal afterwards, id signal is modulated in the main optical signal.For avoiding id signal that main optical signal is produced excessive interference, generally to control the id signal modulation depth, operated by rotary motion is between 3～5%, and maximum is no more than 10%.In addition, can also modulate by decay variable device, gain-variable device, as shown in Figure 4, such as electronic dimmable attenuator (EVOA, ElectricalVariable Optical Attenuator) or semiconductor optical amplifier (SOA, SemiconductorOptical Amplifier), utilize the attenuation of id signal control EVOA or the amount of gain of SOA, can realize EVOA or SOA modulation, thereby id signal is modulated on the main optical signal main optical signal attenuation or amount of gain.
For avoiding the interference of id signal to main optical signal, the frequency of id signal also needs control, because the bandwidth of main optical signal is generally in the G rank, therefore the bandwidth range of id signal is generally below 10MHz, but also can be in the 100MHz rank, but excessive for avoiding interference, 1 the above difference of the order of magnitude is preferably arranged between the bandwidth of main optical signal and the bandwidth of id signal.The signal period of therefore described cursor knowledge signal is more than or equal to ten times of the described service signal cycle.
Because there is the problem of detection equally in id signal, consider that the id signal modulation depth is unsuitable excessive, and speed often also has certain requirement, so id signal often can also be done further processing.Described loading method further comprises spread processing, promptly with the pairing unique identifier of described load(ing) point described id signal is carried out spread processing before id signal is loaded into light signal.Because CDMA can bring extra coding gain, therefore, can take the CDMA method to carry out spread processing equally to id signal, id signal behind the spread spectrum can bring extra coding gain, allow higher detection sensitivity, and in same detection range, can further reduce the modulation depth of id signal, thereby reduce annoyance level to main optical signal.
By above-mentioned processing, can on main optical signal, stamp the mark of id signal by load(ing) point.Id signal transmits along optical fiber downstream with main optical signal.In the control point, downstream, by monitoring institute load signal, the further control loaded time and the loading degree of depth.For example in the load time and the modulation depth of control point, downstream sensed light signal sign; Control the load time of described load(ing) point according to the load time of the light signal sign that is detected; Control the modulation depth of described load(ing) point according to the modulation depth of institute's sensed light signal sign.Because it is unknowable for load(ing) point that cursor that load(ing) point loads is known the degree of depth of signal, cross conference and cause the influence of main optical signal excessively if load the degree of depth, and pass through can recognize current modulation depth situation in the test point or the control point in downstream.Only need will obtain DC component and low frequency component in the signal, the power of corresponding main optical signal power of difference and id signal, ratio between two is modulation depth; Modulation depth is fed back to load(ing) point, can avoid modulation depth dark excessively.The control loaded time, similarly there is no need to go into details.
The present invention also provides a kind of optical associated channel signal detection method, and as shown in Figure 5, it comprises step: B1, the light signal merit is divided into two ways of optical signals at least; B2, road light signal after described merit divided carry out opto-electronic conversion and obtain the corresponding signal of telecommunication; B3, separation and Extraction goes out wherein id signal from the described signal of telecommunication.Wherein, described separation is to adopt DC-isolation method and low frequency filtering method, as shown in Figure 6.The signal that filtering is come out is an id signal, by the detection to id signal, just can judge the relevant information of main optical signal.
Can use spectrum spreading method at load(ing) point, then may further include despreading process in detection method of the present invention.It comprises step: D1, detects described id signal and whether adopts spread processing, otherwise execution in step D2 not; D2, with given orthogonal code id signal is carried out despreading and handle, extract identification information wherein.For example can use the CDMA spectrum spreading method at load(ing) point, because the benefit of CDMA coding gain, so the CDMA despreading can realize more highly sensitive detection.
Detection method of the present invention further comprises, and described id signal is carried out Optical Signal To Noise Ratio detection, load(ing) point identification or power detection.
Wherein, described load(ing) point identification comprises: detect described id signal and whether comprise id information, described id information is used to discern described cursor and knows the pairing load(ing) point of signal.Not only can judge the current id signal that receives from which load(ing) point at test point, can utilize the entrained information of id signal self to judge current id signal is from which load(ing) point equally by the time slot allocation mode.Such as, in id signal, can insert the load(ing) point id information, just can judge current id signal from which load(ing) point by discerning this id information,, then can utilize the CDMA orthogonal code to discern current demand signal from which load(ing) point if id signal is carried out the CDMA spread processing.
Detect and power detection by carrying out Optical Signal To Noise Ratio, can obtain the relevant information of main optical signal.Represent the power of light signal such as the direct current composition of the signal of telecommunication, it comprises the noise component that each amplifier of the main optical signal power composition that enters load(ing) point, the light signal composition that adds later and downstream is introduced; And the id signal composition is directly proportional with the main optical signal power that load(ing) point is entered; Noise component that amplifier after load(ing) point is introduced and the light signal composition that adds later do not have the id signal mark, so id signal can't reflect its composition.By detecting the sign composition, just can obtain the luminous power of main optical signal, and this main optical signal is in the circuit transmission course, there are how many new compositions to add again, if there is not the adding of new light signal, the noise component proportion that can introduce from the amplifier that obtains just, thus judge the degradation of main optical signal.Optical Signal To Noise Ratio detects and power detecting method belongs to prior art, does not repeat them here.
After extracting id signal, by further analysis id signal carried with the road Overhead, and will be relevant with this test point pass to other unit with the road Overhead, finish further operation.APS Overhead such as being used to protect control can transmit by id signal equally.
On optical associated channel signal loading method provided by the invention and optical associated channel signal detection method basis, the present invention also provides a kind of optical associated channel signal method for supervising, and it comprises step: E1, each load(ing) point load cursor at different time slots and know signal; E2, detect described cursor in the control point and know signal, be used for the monitor optical signal.
Wherein, described step e 1 comprises step: A1, be that load(ing) point distributes different time slots; A2, described load(ing) point distribute time slot to send cursor knowledge signal at it.Wherein, described distribution time slot method is a static allocation or by token mode dynamic assignment.Described static allocation is that the time slot allocation relation periodically is set; Describedly refer to that by token mode dynamic assignment described load(ing) point just sends cursor and knows signal after obtaining allowing the token of the information that sends.Life period interval between the id signal that different load(ing) points institute is sent, the described time interval is used to avoid identification collision.Described loading method further comprises spread processing, promptly with the pairing unique identifier of described load(ing) point described id signal is carried out spread processing before id signal is loaded into light signal.Described id signal is the frame signal with certain format; Described frame signal with certain format comprises frame preorder, frame head, frame load, postamble.Described id signal also comprises the pairing id information of described load(ing) point, and described id information is used to discern described cursor and knows the pairing load(ing) point of signal.The signal period of described cursor knowledge signal is more than or equal to ten times of the described service signal cycle.The modulation depth that described cursor is known signal is not more than 10%.Specifically, do not repeat them here as described in the optical associated channel signal loading method.
Wherein, described step e 2 comprises step: B1, the light signal merit is divided into two ways of optical signals at least; B2, road light signal after described merit divided carry out opto-electronic conversion and obtain the corresponding signal of telecommunication; B3, separation and Extraction goes out wherein id signal from the described signal of telecommunication.Wherein, described separation is to adopt DC-isolation method and low frequency filtering method.Whether the signal that described step e 2 can further comprise step: D1, detect described sign adopts spread processing, otherwise execution in step D2 not; D2, handle, extract identification information wherein with specifying orthogonal code that id signal is carried out despreading.Described step e 2 can also further comprise step: described id signal is carried out Optical Signal To Noise Ratio detection, load(ing) point identification or power detection.Wherein, described load(ing) point identification comprises: detect described id signal and whether comprise id information, described id information is used to discern described cursor and knows the pairing load(ing) point of signal.Specifically, do not repeat them here as described in the optical associated channel signal detection method.
Concern by time slot allocation, the control point, downstream all only can detect some existence with the line signal at each time point, distribute to a load(ing) point or detect the unique tag of being carried by detecting current time slots with the line signal, can judge current load(ing) point with line signal representative, by corresponding to the road expense to extracting with the line Signal Processing, thereby obtain the relevant information of main optical path signal, and can be further processed the main optical path signal.
In the control point, also may comprise the processing procedure of burst synchronization, such as, load(ing) point directly will be packaged into the form transmission of Ethernet bag with the road Overhead, then corresponding processing just need be done in the control point, at first needs to carry out finding message packet header synchronously with this ethernet signal.Concrete processing procedure can repeat no more with reference to the processing procedure of ethernet signal herein.
Based on the inventive method, it is as follows that the present invention provides attainable device.
A kind of light signal provided by the invention comprises at the employed checkout gear of test point with the road checkout gear as shown in Figure 7: power splitter, O/E converting unit (photoelectric conversion unit), id signal unit; Wherein: described power splitter is used for the light signal merit is divided into two ways of optical signals at least; Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication; Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
Power splitter separates a part with main optical signal and comes out to use as detecting; The O/E converting unit is finished the conversion to the signal of telecommunication of the light signal separated, can use PIN (Photondiode, photodiode) or APD (Avalanche Photo Diode, avalanche diode) receiver to finish; The processing procedure of the signal of telecommunication is finished in the id signal unit, such as DC-isolation, low frequency filtering etc., the id signal unit further detects the power component of id signal, according to the quantity of power of id signal can know by inference this id signal the watt level of corresponding load(ing) point, also can detect the watt level at test point place place, and can know by inference signal from load(ing) point to test point through the deterioration condition in path.
Owing to can use spectrum spreading method at load(ing) point, therefore light signal provided by the invention further comprises the despreading assembly with the road checkout gear, is used for that the id signal that obtains by spread processing is carried out despreading and handles and transfer to id signal unit extraction identification information wherein.Described despreading assembly can comprise despread unit and orthogonal code generator.Orthogonal code generator is responsible for producing needed orthogonal code, such as detecting the id signal that certain load(ing) point loads, then orthogonal code generator must produce the pairing orthogonal code of this load(ing) point, could from the signal that the id signal unit is exported, extract like this detect corresponding to the road Overhead.The orthogonal code that despread unit utilizes orthogonal code to produce, the signal that the id signal unit is exported carries out the despreading processing.
Checkout gear provided by the present invention can also comprise the overhead processing unit, and what be used for described id signal is carried handles with the road expense, is describedly obtained by described id signal cell processing id signal with the road expense.For example from id signal, extract with the road Overhead, give the overhead processing unit and further handle by despread unit.
A kind of light signal provided by the invention with the road charger as shown in Figure 8, it comprises: overhead processing unit, id signal unit and loading unit; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal.
The processing with the road expense is responsible in the overhead processing unit, and as loading what expense, different expenses how all finished by the overhead processing unit by multiplexing grade.The overhead processing unit is further finished with processing procedures such as the calculating of the framing of road expense, frame check sign indicating number and insertions; The output of overhead processing unit is as the input of id signal unit, the framing information often of output, the simplest direct understanding is exactly data message, wrap such as IP, MAC bag etc., what put these bag the insides is exactly Overhead, the id signal unit at first will become id signal with the road overhead processing, afterwards according to the gap information of distributing to this load(ing) point, at assigned timeslot id signal is used for the control loaded unit, or after obtaining token, come the control loaded unit with id signal, wherein, described distribution time slot method comprises static allocation or by token mode dynamic assignment; Loading unit can be modulator, decay variable device, gain-variable device, by the control of id signal to loading unit, such as the loss of control decay variable device or the gain of ride gain variable device, reach the purpose of control main optical signal intensity, id signal is modulated on the main optical signal the most at last.
Charger can be taked spectrum spreading method, CDMA spectrum spreading method for example, and then described light signal further comprises orthogonal code generator and spectrum-spreading unit with the road charger.Orthogonal code generator produces the pairing unique orthogonal code of this loading node, and orthogonal code passed to spectrum-spreading unit, spectrum-spreading unit utilizes orthogonal code to carry out spread processing to what the expense processing unit produced with road expense frame information, chip information behind the spread spectrum is as the input of id signal unit, when the id signal unit arrives at the time slot of this load(ing) point, or after getting access to token, the id signal of this load(ing) point is input in the loading unit, finish mark by loading unit to main optical signal.
In real network, the application that often combines of load(ing) point and test point, such as a functional unit in the equipment, both needed the id signal from the upstream is detected, simultaneously need to insert the id signal information of this node again, transmit downstream, this functional unit often possesses loading and measuring ability simultaneously.Therefore light signal provided by the invention is with the road charger, can also comprise light signal with the road checkout gear, described checkout gear is used for detected id signal is fed back to the id signal unit of described charger, and the id signal unit of described charger is used to control the load time of described loading unit and loads the degree of depth; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal.Described checkout gear further comprises a despreading assembly, is used for going out described id signal from described signal of telecommunication despreading.Specifically as previously mentioned, repeat no more herein.
Utilize described checkout gear to detect the id signal that described charger loads, can realize monitoring function, become a kind of optical associated channel signal supervising device id signal; Perhaps utilize the detected feedback information of checkout gear to give charger with the control loaded condition, become a kind of cursor and know signal with the road charger with negative feedback control, this device not only comprises loading and measuring ability, can also further control the loading of this node according to detected information.
As shown in Figure 9, the invention provides a kind of optical associated channel signal charger with negative feedback control, it comprises: loading unit, id signal unit 1 and id signal unit 2, overhead processing unit 1 and overhead processing unit 2, O/E converting unit, power splitter.The set out on a journey processing of expense of this locality is responsible for finishing in overhead processing unit 1, comprises that expense is multiplexing, expense framing, the calculation of frame check yardage etc.; Id signal unit 1 is responsible for and will be processed into id signal with the road overhead signal, and utilizes this id signal control loaded unit at the pairing time slot of this load(ing) point, so that id signal is loaded on the main optical signal.Power splitter remains the beam split of finishing main optical signal, and the O/E converting unit is finished the opto-electronic conversion of main optical signal, and processing such as DC-isolation to the signal of telecommunication, low frequency filtering are finished in id signal unit 2, and the processing with the road expense is finished in the overhead processing unit.When this node loading section is not started working as yet, the test section is the id signal in detecting main optical signal all the time, when detect the id signal time slot allocation of coming the upstream to this node be assigned to time slot the time, notification overhead processing unit 1 or id signal unit 1 are prepared to load sign.This control mode can be placed different load(ing) points more like a cork and be loaded sign at one time, causes the conflict of id signal.And when this node loading section is started working, because the degree of depth that loading unit loads is unknowable for charger, cross conference and cause the influence of main optical signal excessively if load the degree of depth, and the checkout gear by the back can be recognized current modulation depth situation.Only need will obtain DC component and low frequency component in the signal, the power of corresponding main optical signal power of difference and id signal, ratio between two is modulation depth, and this is a prior art, does not give unnecessary details at this.By id signal unit 2 is may command id signal unit 1, avoids modulation depth dark excessively.
As shown in Figure 10, the invention provides the optical associated channel signal charger of another kind of band negative feedback control, its id signal unit 1 and 2 can be combined into an id signal unit, and overhead processing unit 1 and overhead processing unit 2 also can be combined into an overhead processing unit.Communication between a plurality of processing units can further be finished by a control unit, and the control information that this control unit is finished between a plurality of different units is mutual.The present invention does not limit these implementations, so long as utilize the detected information of checkout gear to come the control loaded device, can be interpreted as the device of band negative feedback control, and is consistent with the present invention.
Below further set forth application of the present invention.The mentioned cursor of the present invention is known signal loading and detection method and device thereof, can have multiple mode to use.
A kind of implementation in Star Network below is provided, load id signal by light signal in Star Network, and timesharing detects a plurality of id signals in the light signal after closing the road, as shown in Figure 11 different branch.The invention provides a kind of system of monitor optical channel associate signals, pool one tunnel key signal by a plurality of branch road light signals, wherein: branch node comprises charger, and key signal node comprises checkout gear; Described charger is used for loading the light signal sign at different time slots; Described checkout gear is used for the sensed light signal sign; Wherein:
Described charger comprises overhead processing unit, id signal unit and loading unit; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal;
Described checkout gear comprises power splitter, photoelectric conversion unit, id signal unit; Wherein: described power splitter is used for the light signal merit is divided into two ways of optical signals at least; Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication; Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
Applied described charger of native system and described checkout gear are specifically as previously mentioned.This mode is usually expressed as in the WDM network each wavelength signals is loaded different signs, and on optical multiplexing section, can these signs be detected, the existence of judging wavelength signals whether, carrying out further operation, such as the power output of control amplifier etc.; Also can survey, judge the current network working condition, whether carry out further operation,, whether want execute protection etc. such as whether the wavelength blocking-up having taken place with decision according to the power and the OSNR of wavelength signals.
A kind of implementation in the chain network below is provided again, identify by in the chain network, on a plurality of nodes, loading, and a plurality of node also is provided with test point simultaneously, as shown in Figure 12.The present invention also provides the system of another kind of monitor optical signal identification, and wherein, a plurality of nodes are formed a chain network, at described node charger and/or checkout gear are set; Described charger is used for loading the light signal sign at different time slots; Described checkout gear is used for the sensed light signal sign; Wherein:
Described charger comprises overhead processing unit, id signal unit and loading unit; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal;
Described checkout gear comprises power splitter, photoelectric conversion unit, id signal unit; Wherein: described power splitter is used for the light signal merit is divided into two ways of optical signals at least; Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication; Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
Applied described charger of native system and described checkout gear are specifically as previously mentioned.This mode shows in the WDM network, be generally on each optical transmission section and can both load expense, this Overhead can be along transmitting under the whole chain road direction, by the id signal that on each optical transmission section, increases, can find out the amplified spontaneous emission (ASE that is increased on each span line, whether component Amplified SpontaneousEmission) is recognized the deterioration condition of each span line to light signal, and then can point out the network maintenance staff to pay close attention to this span line to take place unusual etc.
The application of the inventive method includes but not limited to above dual mode, also is not limited to dual mode and is used in combination.Such as in the WDM network, should monitor wavelength signals, also need optical multiplexing section (OMS, Optical Multiplex Section), optical transmission section (OTS, OpticalTransmission Section) signal is monitored, just can adopt method of the present invention that above-mentioned dual mode is carried out applied in any combination this moment, do not repeat them here.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (45)
1, a kind of optical associated channel signal loading method is characterized in that:
A1, be that load(ing) point distributes different time slots;
A2, described load(ing) point distribute time slot to send cursor knowledge signal at it.
2, method according to claim 1 is characterized in that, described distribution time slot method is a static allocation or by token mode dynamic assignment.
3, method according to claim 2 is characterized in that, described static allocation is that periodically time slot allocation relation is set.
4, method according to claim 2 is characterized in that, describedly refers to that by token mode dynamic assignment described load(ing) point just sends cursor and knows signal after obtaining allowing the token of the information that sends.
5, method according to claim 1 is characterized in that, life period interval between the id signal that different load(ing) point sent, and the described time interval is used to avoid identification collision.
6, method according to claim 1 is characterized in that, described id signal is the frame signal with certain format.
7, method according to claim 6 is characterized in that, described frame signal with certain format comprises frame preorder, frame head, frame load, postamble.
8, method according to claim 6 is characterized in that, described id signal also comprises the pairing id information of described load(ing) point, and described id information is used to discern described cursor and knows the pairing load(ing) point of signal.
9, method according to claim 1 is characterized in that, the signal period of described cursor knowledge signal is more than or equal to ten times of the described service signal cycle.
10, method according to claim 1 is characterized in that, the modulation depth that described cursor is known signal is not more than 10%.
11, method according to claim 1 is characterized in that, by monitoring institute load signal, and the further control loaded time and the loading degree of depth.
12, method according to claim 1 is characterized in that, described loading method further comprises spread processing, promptly with the pairing unique identifier of described load(ing) point described id signal is carried out spread processing before id signal is loaded into light signal.
13, a kind of optical associated channel signal detection method is characterized in that:
B1, the light signal merit is divided into two ways of optical signals at least;
B2, road light signal after described merit divided carry out opto-electronic conversion and obtain the corresponding signal of telecommunication;
B3, separation and Extraction goes out wherein id signal from the described signal of telecommunication.
14, method according to claim 13 is characterized in that, described separation is to adopt DC-isolation method and low frequency filtering method.
15, method according to claim 13 is characterized in that, further comprises:
D1, detect described id signal and whether adopt spread processing, otherwise execution in step D2 not;
D2, with given orthogonal code id signal is carried out despreading and handle, extract identification information wherein.
16, according to claim 13 or 15 arbitrary described methods, it is characterized in that, further comprise: described id signal is carried out Optical Signal To Noise Ratio detection, load(ing) point identification or power detection.
17, method according to claim 16 is characterized in that, described load(ing) point identification comprises: detect described id signal and whether comprise id information, described id information is used to discern described cursor and knows the pairing load(ing) point of signal.
18, a kind of optical associated channel signal method for supervising is characterized in that:
E1, each load(ing) point load cursor at different time slots and know signal;
E2, detect described cursor in the control point and know signal, be used for the monitor optical signal.
19, method according to claim 18 is characterized in that, described step e 1 comprises step:
A1, be that load(ing) point distributes different time slots;
A2, described load(ing) point distribute time slot to send cursor knowledge signal at it.
20, method according to claim 19 is characterized in that, described distribution time slot method is a static allocation or by token mode dynamic assignment.
21, method according to claim 20 is characterized in that, described static allocation is that the time slot allocation relation periodically is set.
22, method according to claim 20 is characterized in that, describedly refers to that by token mode dynamic assignment described load(ing) point just sends cursor and knows signal after obtaining allowing the token of the information that sends.
23, method according to claim 19 is characterized in that, different load(ing) points between the id signal that sent life period at interval, the described time interval is used to avoid identification collision.
24, method according to claim 19 is characterized in that, described loading method further comprises spread processing, promptly with the pairing unique identifier of described load(ing) point described id signal is carried out spread processing before id signal is loaded into light signal.
25, method according to claim 19 is characterized in that, described id signal is the frame signal with certain format.
26, method according to claim 25 is characterized in that, described frame signal with certain format comprises frame preorder, frame head, frame load, postamble.
27, method according to claim 25 is characterized in that, described id signal also comprises the pairing id information of described load(ing) point, and described id information is used to discern described cursor and knows the pairing load(ing) point of signal.
28, method according to claim 19 is characterized in that, the signal period of described cursor knowledge signal is more than or equal to ten times of the described service signal cycle.
29, method according to claim 19 is characterized in that, the modulation depth that described cursor is known signal is not more than 10%.
30, method according to claim 18 is characterized in that, described step e 2 comprises step:
B1, the light signal merit is divided into two ways of optical signals at least;
B2, road light signal after described merit divided carry out opto-electronic conversion and obtain the corresponding signal of telecommunication;
B3, separation and Extraction goes out wherein id signal from the described signal of telecommunication.
31, method according to claim 30 is characterized in that, described separation is to adopt DC-isolation method and low frequency filtering method.
32, method according to claim 30 is characterized in that, further comprises:
Whether D1, the signal that detects described sign adopt spread processing, otherwise execution in step D2 not;
D2, handle, extract identification information wherein with specifying orthogonal code that id signal is carried out despreading.
33, according to claim 30 or 32 arbitrary described methods, it is characterized in that, further comprise: described id signal is carried out Optical Signal To Noise Ratio detection, load(ing) point identification or power detection.
34, method according to claim 33 is characterized in that, described load(ing) point identification comprises: detect described id signal and whether comprise id information, described id information is used to discern described cursor and knows the pairing load(ing) point of signal.
35, a kind of optical associated channel signal checkout gear is characterized in that, it comprises power splitter, photoelectric conversion unit, id signal unit; Wherein:
Described power splitter is used for the light signal merit is divided into two ways of optical signals at least;
Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication;
Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
36, checkout gear according to claim 35 is characterized in that, further comprises the despreading assembly, is used for that the id signal that obtains by spread processing is carried out despreading and handles and transfer to id signal unit extraction identification information wherein.
37, checkout gear according to claim 36 is characterized in that, described despreading assembly comprises orthogonal code generator and despread unit.
38, according to claim 35 or 36 arbitrary described checkout gears, it is characterized in that, it also comprises the overhead processing unit, and what be used for described id signal is carried handles with the road expense, is describedly obtained by described id signal cell processing id signal with the road expense.
39, a kind of charger of optical associated channel signal is characterized in that, it comprises overhead processing unit, id signal unit and loading unit; Wherein:
Described overhead processing unit is used to produce that id signal carries with the road expense;
Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing;
Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal.
According to the described charger of claim 39, it is characterized in that 40, described distribution time slot method comprises static allocation or by token mode dynamic assignment.
41, according to the described charger of claim 39, it is characterized in that, described charger also comprises orthogonal code generator and spectrum-spreading unit, and described orthogonal code generator is used to produce the pairing unique orthogonal code of present node, and described orthogonal code is passed to spectrum-spreading unit.
42, according to the described charger of claim 39, it is characterized in that, it also comprises a checkout gear, described checkout gear is used for detected id signal is fed back to the id signal unit of described charger, and the id signal unit of described charger is used to control the load time of described loading unit and loads the degree of depth; Wherein:
Described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal.
According to the described charger of claim 42, it is characterized in that 43, described checkout gear further comprises a despreading assembly, be used for going out described id signal from described signal of telecommunication despreading.
44, a kind of system of monitor optical channel associate signals pools one tunnel key signal by a plurality of branch road light signals, and it is characterized in that: branch node comprises charger, and key signal node comprises checkout gear; Described charger is used for loading the light signal sign at different time slots; Described checkout gear is used for the sensed light signal sign; Wherein:
Described charger comprises overhead processing unit, id signal unit and loading unit; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal;
Described checkout gear comprises power splitter, photoelectric conversion unit, id signal unit; Wherein: described power splitter is used for the light signal merit is divided into two ways of optical signals at least; Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication; Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
45, a kind of system of monitor optical signal identification is characterized in that, a plurality of nodes are formed a chain network, at described node charger and/or checkout gear are set; Described charger is used for loading the light signal sign at different time slots; Described checkout gear is used for the sensed light signal sign; Wherein:
Described charger comprises overhead processing unit, id signal unit and loading unit; Wherein: described overhead processing unit is used to produce that id signal carries with the road expense; Described id signal unit is used for becoming id signal with the control loaded unit with described with the road overhead processing; Described loading unit is used at the corresponding time slot that the place load(ing) point is distributed id signal being modulated to main optical signal;
Described checkout gear comprises power splitter, photoelectric conversion unit, id signal unit; Wherein: described power splitter is used for the light signal merit is divided into two ways of optical signals at least; Described photoelectric conversion unit is used for that road light signal behind the described merit branch is carried out opto-electronic conversion and obtains the corresponding signal of telecommunication; Described id signal unit is used for going out wherein id signal from described signal of telecommunication separation and Extraction.
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