TWI549441B - Using Optical Fiber Home to Service Network Management Information Quickly Diagnose Methods of Optical Distribution Network Barriers - Google Patents

Description

Method for quickly diagnosing optical distribution network obstacles by using fiber-to-the-home service network management information

The invention relates to a fiber-to-the-home broadband service for quickly diagnosing obstacles in an optical distribution network, in particular, using a fiber-to-the-home broadband service xPON (different type passive optical network) network management information to be corrected by a calibration program and a logic method, and the light can be diagnosed. A technique for allocating network anomalies.

The fiber-to-the-home architecture is different from the traditional point-to-point architecture (Point to Point (P2P)), which uses Point to Multi-Point (P2MP), optical line terminal equipment. (Optical Line Terminal, abbreviated as: OLT) is transmitted to a plurality of optical equipment units (OCUs) through optical splitter (Optical Splitter), and this method can greatly reduce the amount of optical fiber used, and Reduce capital expenditures for deployment, but the physical layer of the fiber network has become quite complex. Due to the complexity of fiber optic networks, fiber barrier inspection operations have become quite difficult. Previously, there was an optical time domain reflectometer (OTDR) monitoring method. The optical time domain reflector test takes about 1 to 2 minutes per route and the acquisition equipment is quite expensive. The network that arrives at home is widely used. It takes a long time to test this test method. Therefore, in the mastery of timeliness, it shows considerable disadvantages and increases the cost of CAPEX (Capital Expenditure). It can be seen that there are still many shortcomings in the above-mentioned methods of use, which are not good designs and need to be improved.

The inventor of the present invention considers the various costs derived from the above-mentioned conventional methods. Under the circumstance, Nai Sisi has made innovations and innovations, and after years of painstaking research, he finally succeeded in research and development of this method to quickly diagnose optical barriers using the fiber-to-the-home broadband service xPON network management information, which can reduce the fiber-to-the-home broadband service of telecom companies. CAPEX and OPEX (Operating Expenditure) expenses.

The object of the present invention is to provide a method for quickly diagnosing an optical distribution network barrier by using a fiber-to-the-home service network management information, and when the optical distribution network (ODN) of the service has a problem, The optical layer information of the xPON network management equipment can be intelligently diagnosed whether the ODN is fiber break, fiber attenuation or fiber bending, and can correctly determine the interval of the ODN barrier to clearly clarify the problem of the ODN; Correctly and clearly display the type of obstacles to reduce maintenance costs and improve barrier maintenance efficiency.

After achieving the above-mentioned object, the fiber-to-the-home broadband service xPON network management information can be quickly diagnosed by the calibration procedure and the logic method, and the method for diagnosing the light distribution network obstacle can be quickly diagnosed. The method first establishes the optical layer information correction logic method model of the network management, and then establishes the optical power budget value of each broadband circuit, and must satisfy the reasonable range of the logic method model, and then establish an ODN barrier type logic method model to achieve the diagnosable optical distribution network. Road abnormal technology.

6‧‧‧Light Distribution Network Barrier Diagnostic System

7‧‧‧xPON network management

8‧‧‧First-order optical splitter

9‧‧‧Second-order optical splitter

10‧‧‧xPON OLT optical line terminal equipment

11‧‧‧Fiber

12‧‧‧Adjustable attenuator

13‧‧‧Light splitter

14‧‧‧ optical power meter

15‧‧‧xPON ONT Optical Network Terminal Equipment

16‧‧‧DOD diagnosis results: fiber decay event

17‧‧‧ODN upper/downward optical loss difference and fiber bending radius

18‧‧‧DOD diagnosis results: fiber bending event

19‧‧‧ODN barrier interval analysis results: the obstacle location occurred in front of the optical divergence

20‧‧‧ODN barrier interval analysis results: the location of the obstacle occurred behind the light splitter

101~109‧‧‧Steps

201~205‧‧‧Steps

Figure 1 is a system architecture diagram of a method for rapidly diagnosing optical network barriers using fiber-to-the-home service network management information.

Figure 2 is a schematic diagram of the calibration test of the network management optical layer downlink using the method of fiber-to-the-home service network management to quickly diagnose optical barriers.

Figure 3 is a schematic diagram of the calibration test of the network management optical layer uplink using the method of fiber-to-the-home service network management to quickly diagnose optical barriers.

Figure 4 is an actual measured equivalent fiber attenuation event for the method of rapidly diagnosing the optical distribution network barrier using the fiber-to-the-home service network management information.

Figure 5 is a diagram showing the relationship between the difference in ODN up/downlight loss and the bend radius of the fiber using the method of fiber-to-the-home service network management to quickly diagnose the optical distribution network obstacle.

Figure 6 is a graph showing the results of the ODN barrier diagnosis using the method of fiber-to-the-home service network management to quickly diagnose the optical distribution network barrier.

Figure 7 shows the obstacle location of the method for quickly diagnosing light distribution network barriers using fiber-to-the-home service network management information in front of the light divergence.

Figure 8 shows the obstacle location of the method for quickly diagnosing optical barriers using the fiber-to-the-home service network management information to occur behind the light divergence.

Figure 9 is a block diagram of the acquisition calibration curve of the method for rapidly diagnosing the optical distribution network barrier using the fiber-to-the-home service network management information.

Figure 10 is a block diagram of the above/downstream optical power correction method for quickly utilizing the fiber-to-the-home service network management information to quickly diagnose optical barriers.

Figure 11 is a flow chart of the method for determining the optical distribution network obstacle rule by using the fiber-to-the-home service network management information to quickly diagnose the optical distribution network obstacle.

Specific embodiments will be described below to illustrate embodiments of the invention, but It is not intended to limit the scope of the invention as claimed.

The invention is directed to a method for quickly diagnosing an optical distribution network obstacle by using a fiber-to-home service network management information to undergo a calibration procedure and incorporating adjacent circuit analysis under the same PON. The invention can provide a method for quickly diagnosing light distribution network obstacles, which is easy to operate and cost-effective to check.

1 is a diagram showing a method for diagnosing a light distribution network barrier of the present invention, which includes an xPON OLT 10, a first-order optical splitter 8, a plurality of second-order optical splitters 9, a plurality of xPON ONTs 15, and an xPON network management system. And a light distribution network obstacle diagnosis system 6. The xPON OLT 10 is connected to the first-order optical splitter 8 through the optical fiber 11; the first-order optical splitter 8 is also connected to the second-order optical splitter 9 through the optical fiber 11; the second-order optical splitter 9 is also connected through the optical fiber 11. Up to several xPON ONTs 15 (Optical Network Terminal, ONT); xPON network management system 7 and optical distribution network barrier diagnosis system 6 are respectively connected to the xPON OLT 15 through the network, wherein the optical distribution network is disabled. The logic core algorithm of the diagnostic system 6 is the method proposed in this patent.

In order to establish the intelligent diagnostic capability of the ODN, the optical layer information of the xPON network management system 7 must be corrected first, and the establishment of the optical layer information of the xPON network management system must first establish a correct calibration logic method model, and the correction value can be accurate. In the optical information of xPON network management 7, the measurement error specification of xPON OLT10 is ≦±2dB; the measurement error value of xPON ONT 15 is ≦±3dB, so the light information of xPON network management 7 must be corrected to reduce its quantity. The error value is measured to facilitate the development of diagnostic functions for ODN barrier types.

Figure 2 shows the characteristic curve correction architecture of the ONT optical power information of the network management optical layer. The xPON OLT 10 output is connected to the optical fiber 11 and then connected to the optical attenuator 12, and then connected to the 1×2 optical splitter 13, The 1×2 optical splitter 13 must be corrected for the error value of the two turns before installation. The two turns after the 1×2 optical splitter 13 are connected to the optical power meter 14 and the xPON ONT 15, respectively. The calibration step is to adjust the optical attenuator 12 to adjust the input optical power values of the optical power meter 14 from -8 dBm to -30 dBm, respectively, and each adjustment step is 0.5 dB, and record the xPON ONT 15 corresponding to each step. The optical power measurement value of the optical power meter 14. The number of corrections is >30, and the curve of the downward optical power information is plotted by curve fitting.

Figure 3 shows the characteristic curve correction architecture of the upstream OLT optical power information of the network management optical layer. The xPON ONT 15 output is connected to the optical attenuator 12 and then to the optical fiber 11, then the optical power meter 14, and finally to the xPON OLT 10. The correcting step is to adjust the optical attenuator 12 to make the input optical power values of the optical power meter 14 from -8 dBm to -30 dBm, and each adjustment step is 0.5 dB, and record the xPON OLT 10 corresponding to each step. The optical power measurement value of the optical power meter 14. The number of corrections is >30, and the curve of the downward optical power information is plotted by curve fitting.

The end-to-end reasonable optical loss range logic method model is as follows, the optical layer test data retrieved from the xPON network management system 7 includes: xPON OLT 10 transmit power, xPON OLT 10 receive power, xPON ONT 15 transmit power, and xPON ONT 15 receive power. The relevant test data must first undergo a calibration procedure, and then calculate the optical power budget of each channel must meet a reasonable range, and the end-to-end reasonable optical loss range logic method model is: end-to-end reasonable optical loss range = Σ (fiber length light Loss) + Σ (fiber connector optical loss) + Σ (light splitter light loss) ± error range, where fiber length optical loss is the average optical loss per kilometer of individual above / downstream wavelength fiber calculation (including fusion point); fiber connection The optical loss is calculated based on the average optical loss of the fiber optic connector; the optical loss of the optical splitter is calculated as the average optical loss of the optical splitter; the error range is the corrected optical power error value of the xPON optical layer information plus all optical passive components. The maximum error in light loss. If the optical power obtained by the network management is corrected and the end-to-end two-wavelength optical loss is calculated within the reasonable range, then Diagnosing the ODN network is normal. If there is a working wavelength in the uplink or downlink, and the optical loss exceeds the reasonable optical loss range, the diagnosis of the ODN network is impeded. The logical method model is described below.

End-to-end reasonable optical loss range = Σ (fiber length optical loss) + Σ (optical fiber spliced light loss) + Σ (fiber connector optical loss) + Σ (light splitter light loss) ± error range

(a) The upstream fiber attenuation coefficient α = A dB / km is obtained from the optical cable experimental data.

(b) The downstream fiber attenuation coefficient α=B dB/km is obtained from the optical cable experimental data.

(c) Number of fusion points of optical fiber: 4+ L/1.5 ,among them Gaussian symbol; L; fiber length and L>0, the unit is km.

(d) Average optical loss per turn of the optical splitter: C dB.

(e) Average optical loss of fiber optic connector SC/PC: D dB.

(f) Number of optical connectors SC/PC: E.

(g) Average optical loss of fiber optic connector SC/APC: F dB.

(h) Number of optical connectors SC/APC: G.

(i) Fiber splice loss: H dB.

(j) Error range: I dB.

Taking the distance L (km) as the parameter to bring into the above equation, the reasonable light attenuation value can be obtained as W×α+4+ L/1.5 ×H+C+D×E+F×G±I.

ODN barrier type models have fiber break events, fiber decay events Explain as follows with the fiber bending event:

(a) Fiber breakage event

If the optical receiving/transmitting power value of the xPON ONT 10 and the Dying Gasp message of the xPON ONT 10 are not received, but the LoS (Loss of Signal) alarm message of the xPON ONT 15 is received, it is determined to be a fiber disconnection event; Upon receiving the Dying Gasp message, it is determined that the xPON ONT 15 is in the off state.

(b) Fiber attenuation event

If the network management obtains the corrected value of the optical power, and then calculates the optical loss value of the uplink/downlink end, if at least the uplink end optical loss value exceeds the reasonable optical loss range, and the short-wavelength optical loss>long-wavelength optical loss, Then it is judged that there is a fiber attenuation event. Figure 4 shows the actual measured equivalent fiber attenuation event when the system diagnoses the ODN barrier.

(c) Fiber bending event

If the network management obtains the corrected value of the optical power, and then calculates the optical loss value of the uplink/downlink end, if at least the downlink end-to-end optical loss value exceeds the reasonable optical loss range, and the long-wavelength optical loss>short-wavelength optical loss, Then it is judged that there is a fiber bending event. As shown in Fig. 5, the difference between the upper/downward optical loss of the ODN and the bending radius of the optical fiber is 17, and the sixth figure shows the equivalent optical fiber bending radius data value 18 when the system diagnoses the ODN obstacle.

According to the above-mentioned type of ODN barrier, fiber breakage, fiber bending event, and fiber attenuation event can be diagnosed. If the optical layer information analysis of adjacent circuits under the same PON is combined, the obstacle interval of the ODN can be further diagnosed, as shown in FIG. As shown, if adjacent circuits have the same type of fiber barrier, it can be determined that the obstacle position occurs in front of the splitter; as shown in Fig. 8, if only individual fiber barriers are present, it is determined that the obstacle position occurs behind the splitter. .

In order to clarify the method of diagnosing the optical distribution network obstacle more clearly and concisely, the ninth, tenth, and eleventh drawings are respectively described in detail in a flowchart. Figure 9 illustrates the curve fitting The method obtains the calibration curve. First, the OLT/ONT optical power value measurement value 101 is read from the xPON network management system 7 by using the methods described in FIG. 2 and FIG. 3, and the recorded OLT/ONT optical power measurement value is utilized. The curve fitting method 102 obtains an OLT/ONT optical power correction curve 103. When the original uncorrected specific OLT/ONT optical power value 104 is obtained from the xPON network management unit 7, the corrected specific OLT/ONT optical power value 105 is obtained through the calibration curve 103, and the flow thereof is as shown in FIG. Then, according to the flowchart of the method for diagnosing the optical distribution network barrier described in FIG. 11, the specific OLT/ONT optical power value 101 is first read from the xPON network management, and then it is checked whether the LoS 106 is received, and if the LoS 106 is received. Then, it is checked again whether Dying Gasp 107 is received, and if so, it is judged that ONT is off 201; if not, it is judged that the ODN fiber is disconnected 202. In the same manner as above 106, if the LoS 106 is not received, the xPON network management reads the original uncorrected specific OLT/ONT optical power value 104, corrects the value 105 by the calibration procedure, and continues to calculate the specific circuit up/downlight loss value 108. And then compare with the end-to-end reasonable optical loss range 109, if it falls into the end-to-end reasonable optical loss range 109, then judge the ODN fiber is normal 203; otherwise continue to check whether the downstream optical power is higher than the end-to-end reasonable light The loss range and the downlink optical power are greater than the uplink optical power 110. If yes, it is determined that the ODN fiber is bent 204; if not, the ODN fiber is determined to be attenuated 205.

The expert diagnostic method for the passive optical fiber network obstacle detection provided by the present invention has the following advantages when compared with other conventional methods:

1. The invention utilizes the fiber-to-the-home broadband service xPON network management information to calculate the obstacle of the optical distribution network quickly after the calibration procedure and the logic method calculation, and only provides the feasible, reliable, simple, and economical value through the network management information value addition. Passive optical network barrier detection method.

2. The invention can simultaneously diagnose and display 64 or more divergent routes of 1st order or 2nd order on the ODN. The latest situation, the goal of achieving rapid, large-scale diagnosis.

3. The present invention performs single-ended and long-term automatic detection of ODN, and can quickly and correctly clarify the service system or ODN obstacles, and the preventive maintenance can be performed by the latest state of each divergent route, thereby providing better service quality.

4. The invention can reduce the personnel cost of the network maintenance, and can ensure the reliability and stability of the passive optical network and improve the maintenance efficiency, and the economic benefit is very obvious.

The detailed description of the present invention is intended to be illustrative of a preferred embodiment of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

To sum up, this case is not only innovative in terms of technical thinking, but also has many of the above-mentioned functions that are not in the traditional methods of the past. It has fully complied with the statutory invention patent requirements of novelty and progressiveness, and applied for it according to law. Approved this invention patent application, in order to invent invention, to the sense of virtue.

6‧‧‧Light Distribution Network Barrier Diagnostic System

7‧‧‧xPON network management

8‧‧‧First-order optical splitter

9‧‧‧Second-order optical splitter

10‧‧‧xPON OLT optical line terminal equipment

11‧‧‧Fiber

15‧‧‧xPON ONT Optical Network Terminal Equipment

Claims (10)

A method for rapidly diagnosing an optical distribution network barrier by using fiber-to-the-home service network management information, which is applied to a fiber-optic network system, wherein the fiber-optic network system comprises an optical line terminal device, a plurality of optical network terminal devices, and at least a first-order optical divergence The optical line terminal device, the optical network terminal device and the optical splitter are connected by an optical fiber, and the method for diagnosing the optical distribution network obstacle comprises the following steps: from different types of passive optical network (xPON) network management Reading the optical power of the specific optical line terminal device or the optical network terminal device to obtain optical layer network management information; and passing the optical line terminal device or the optical network terminal device optical power through a calibration procedure to determine the corrected Whether the uplink/downlight optical loss falls within a reasonable end-to-end reasonable optical loss range, and determines the obstacle type or obstacle interval of the optical distribution network, wherein the end-to-end reasonable optical loss range = Σ (fiber length Light loss) + Σ (optical fiber spliced light loss) + Σ (fiber connector light loss) + Σ (light splitter light loss) ± error range, where the error range is the passive Optical power error correction value information network layer plus light loss of the light of all passive optical components maximum error. The method of claim 1, wherein the optical distribution network barrier type comprises one of a fiber break event, a fiber attenuation event, a fiber bending event, or a combination of two. The method of claim 1, wherein determining the barrier type or the obstacle interval of the optical distribution network comprises the steps of: reading the optical power of the specific optical line terminal device or the optical network terminal device from the passive optical network network management Then, the optical power terminal equipment/optical network terminal equipment optical power is corrected, and if the corrected uplink/downlight optical loss falls within the end-to-end reasonable optical loss range, the judgment occurs in The optical fiber of the optical distribution network between the optical line terminal device and the optical network terminal device is normal, wherein the type and interval of the optical distribution network are caused by the optical fiber network between the optical line terminal device and the optical network terminal device. road. The method of claim 1, wherein determining the barrier type or the obstacle interval of the optical distribution network further comprises the step of: reading the specific optical line terminal device or the optical network from the different type of passive optical network network management system. The optical power of the terminal device, and then the optical power of the optical line terminal device or the optical network terminal device is corrected, if the corrected downlink optical loss is higher than the end-to-end reasonable optical loss range and the downlink optical loss is greater than the uplink For optical loss, it is determined that the optical fiber barrier occurring between the optical line terminal device and the optical network terminal device is a fiber bending event. The method of claim 1, wherein determining the optical distribution network barrier type or the obstacle interval further comprises: reading the specific optical line terminal device or the optical network terminal device optical power from the different type passive optical network network management system. And then correcting the optical power of the optical line terminal device or the optical network terminal device, if the corrected uplink or downlink optical loss is higher than the end-to-end reasonable optical loss range and does not satisfy the bending obstacle condition, the judgment occurs. The fiber barrier between the optical line terminal device and the optical network terminal device is a fiber attenuation event. The method of claim 1, wherein determining the optical distribution network barrier type or the obstacle interval further comprises: reading the optical power of the specific optical line terminal device or the optical network terminal device from the different type of passive optical network network management system, If the optical receiving/transmitting power value of the optical network terminal device and the Dying Gasp message of the optical network terminal device are not received, but the optical network terminal device is received The signal loss (LoS) alarm message determines that the fiber barrier occurring between the optical line terminal device and the optical network terminal device is a fiber break event. The method of claim 1, wherein determining the optical distribution network barrier type or the obstacle interval further comprises: reading the optical power of the specific optical network terminal device from the different type of passive optical network network management, if only received The Dying Gasp message indicates that the optical network terminal device is powered off. The method of claim 1, wherein determining the optical distribution network barrier type or the obstacle interval further comprises: reading the specific optical line terminal device or the optical network terminal device optical power from the different type passive optical network network management system. And then correcting the optical power of the optical line terminal device or the optical network terminal device, and determining whether the corrected uplink/downlight optical loss falls within a reasonable end-to-end optical loss range to determine the optical distribution network. The road barrier type is a fiber break event, a fiber attenuation event or a fiber bend event. If the optical layer information analysis of the adjacent circuit under the same passive optical network is combined, the obstacle interval of the optical distribution network can be further diagnosed; If adjacent circuits have the same type of obstacle, it can be judged that the obstacle position occurs in front of the optical splitter. The method of claim 1, wherein determining the barrier type or the obstacle interval of the optical distribution network further comprises: reading the specific optical line terminal device/optical network terminal device light from the different type passive optical network network management system. Power, and then the optical line terminal device/optical network terminal device optical power is subjected to a corrected procedure to determine whether the corrected uplink/downlight optical loss falls within the end-to-end reasonable optical loss range to determine the optical distribution network The type of barrier is a fiber break event, a fiber attenuation event, or If the optical fiber bending event is combined with the optical layer information analysis of the adjacent circuit under the same passive optical fiber network, the obstacle interval of the optical distribution network can be further diagnosed; if the adjacent optical circuit does not have the same optical fiber barrier type, For individual fiber barriers, it is determined that the obstacle location occurs behind the light splitter. The method of claim 1, wherein the reasonable optical attenuation value of the end-to-end reasonable optical loss range is W×α+4+ L/1.5 ×H+C+D×E+F×G±I; where α is the fiber attenuation coefficient (dB/km), 4+ L/1.5 The number of splice points for the fiber, and Gaussian symbol, L is the length of the fiber and L>0 (km), C is the average optical loss (dB) per aperture of the optical splitter, D is the average optical loss (dB) of the fiber connector SC/PC, and E is the fiber connection. The number of SC/PC, F is the average optical loss (dB) of the fiber connector SC/APC, G is the number of fiber connectors SC/APC, H is the fiber fusion loss (dB), and I is the error range (dB).