NG-PON equipment test system

Abstract

The invention relates to an NG-PON (Next Generation-Passive Optical Network) equipment test system, which is used for detecting equipment in an NG-PON formed by sequentially connecting an optical line terminal, a wavelength division multiplexer, an optical splitter and an optical network unit through optical fibers, and comprises an optical time domain reflection tester with adjustable output wavelength and a plurality of optical fiber reflection devices, the optical time domain reflectometer is arranged on one side of the optical line terminal and is connected with the wavelength division multiplexer; the plurality of optical fiber reflection devices are arranged between an optical splitter and an optical network unit (4) of the NG-PON network, and wavelengths reflected by the optical fiber reflection devices are different. Compared with the prior art, the optical fiber reflection devices with different reflection wavelengths are arranged for each optical path, and the optical time domain reflection tester capable of outputting the corresponding wavelength is adopted, so that each optical path is independently tested, and real-time monitoring can be realized while normal optical fiber signal propagation is not influenced; and the detection accuracy and efficiency are higher.

Description

Technical Field

[0001] The present invention relates to the technical field of passive optical network status detection, and in particular to a running status test system for NG-PON devices. Background Art

[0002] PON is a typical passive optical fiber network, which means that there are no electronic devices or electronic power supplies in the optical distribution network. It is entirely composed of passive devices such as optical splitters and does not require expensive active electronic devices. A passive optical network includes an optical line terminal installed at a central control station and a batch of supporting optical network units installed at user sites.

[0003] Currently, based on TWDM-PON (Time and wavelength division multiplexed PON), it has gradually become the mainstream technical solution in NG-PON (Next Generation Passive Optical Network). It is a multi-wavelength passive optical network that can operate at speeds of 40 to 80 Gb / s. In addition, it can also operate at three different channel rates, which range from 10 / 10 Gbit / s to 2.5 / 2.5 Gbit / s and 10 / 2.5 Gbit / s per user. And TWDM-PON has the ability to generate 1 to 4 different wavelength signals in the optical band. Since it mixes multiple XG-PONs in the way of WDM, the original PON detection scheme is no longer applicable. With the popularization and application of this technology, a targeted maintenance and detection scheme for this technical solution is required. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned existing technologies and provide a test system for NG-PON devices.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An NG-PON device test system for detecting devices in an NG-PON network composed of an optical line terminal, a wavelength division multiplexer, an optical splitter, and an optical network unit connected in sequence through optical fibers. The test system includes an optical time domain reflectometer with adjustable output wavelength and a plurality of optical fiber reflection devices;

[0007] The optical time domain reflectometer is arranged on one side of the optical line terminal and connected to the wavelength division multiplexer;

[0008] The plurality of optical fiber reflection devices are arranged between the optical splitter and the optical network unit of the NG-PON network, and the wavelengths reflected by each optical fiber reflection device are different.

[0009] As a preferred technical solution, a fiber optic reflection device is provided between each optical network unit and the optical splitter in the NG-PON network.

[0010] As a preferred technical solution, the fiber optic reflection device is disposed at one end close to the optical splitter.

[0011] As a preferred technical solution, the fiber optic reflection device includes a splitter that divides the input signal into two paths, one of which serves as the output end and the other as the reflection end. The input end of the splitter is connected to the optical splitter through an optical output interface, the output end is connected to the optical network unit through an optical input interface, and the reflection end is connected to a reflector after passing through a filtering device.

[0012] As a preferred technical solution, the filtering device is a fiber grating.

[0013] As a preferred technical solution, the central wavelengths of the fiber gratings of the fiber optic reflection devices in the test system are all different.

[0014] As a preferred technical solution, a coating is provided on the surface of the reflector, and the reflectivity is greater than or equal to 90%.

[0015] As a preferred technical solution, the splitting ratio of the reflection end to the output end of the splitter is from 2:98 to 7:93.

[0016] As a preferred technical solution, the optical input interface and the optical output interface of the fiber optic reflection device are APC interfaces.

[0017] As a preferred technical solution, an upstream and downstream data acquisition module is connected to the data of the optical splitter in the NG-PON network.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) By providing fiber optic reflection devices with different reflection wavelengths for each optical path and using an optical time domain reflectometer capable of outputting corresponding wavelengths, the present invention realizes separate testing for each optical path, and the testing is more accurate.

[0020] 2) The fiber optic reflection device of the present invention performs splitting detection on the transmission signal by setting a splitter, and can achieve real-time monitoring without affecting the normal propagation of the fiber optic signal, and the detection efficiency is higher.

[0021] 3) The present invention provides an upstream and downstream data collector at the optical splitter to collect fiber optic transmission data, which is convenient for subsequent analysis of the data in transmission in the background. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural block diagram of the NG-PON device test system of the present invention;

[0023] Figure 2 This is a schematic structural diagram of the fiber optic reflection device of the present invention;

[0024] As shown by the reference numerals in the figure: 1, optical line terminal; 2, wavelength division multiplexer; 3, optical splitter; 4, optical network unit; 5, optical time domain reflectometer; 6, fiber optic reflection device; 61, splitter; 62, fiber grating; 63, reflector; 7, up / downlink data acquisition module. Specific embodiments

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0026] Embodiment 1

[0027] As one of the preferred embodiments of the present invention, as Figure 1 shown, in this embodiment, the test system performs status detection on the NG-PON including the optical line terminal 1, wavelength division multiplexer 2, 3, optical splitter, and 4, optical network unit. This network mixes 4 optical line terminals 1 through the wavelength division multiplexer 2. In the downlink direction, the optical line terminal outputs 4 optical signals with different downlink wavelengths at a rate of 10 Gbit / s, and they are combined into a 40 Gbit / s optical signal through an arrayed waveguide grating. After the downlink signal is split by an optical splitter with a splitting ratio of 1:64 in two stages, each signal is

[0028] transmitted to the corresponding user-side optical network unit. A narrowband filter is built in at the optical network unit end to filter out and receive the optical signal of the required wavelength. In the uplink direction, each optical network unit can use any one of the 4 uplink wavelengths for transmission. Which wavelength is specifically used depends on the network planning. ONUs using the same wavelength access the uplink in a TDMA manner, and there is no mutual interference between ONUs with different wavelengths, thereby achieving a downlink rate of 40 Gbit / s and an uplink rate of 10 Gbit / s.

[0029] In this embodiment, an optical fiber reflection device 6 is provided between each optical network unit 4 and the optical splitter 3 in the NG-PON network of the test system. The optical fiber reflection device 6 is arranged at one end close to the optical splitter 3, and the wavelengths reflected by the optical fiber reflection devices 6 are different from each other. An optical time domain reflectometer 5 with adjustable output wavelength is provided at one end of the wavelength division multiplexer 2 and the optical line terminal 1. The light emitting unit of the optical time domain reflectometer 5 can use a semiconductor laser, a laser diode, etc. According to the optical fiber reflection device 6 of the acquisition target, a test optical signal of a predetermined wavelength is sent, and is transmitted to the optical fiber through an optical fiber coupler. Then, the optical time domain reflectometer 5 receives the signal reflected back by the corresponding optical fiber reflection device 6. Based on this setting, the detection of the state of a single optical path can be realized. And this system also connects an uplink and downlink data acquisition module 7 to the data of the optical splitter 3 in the NG-PON network to capture the data transmitted in the network, and the captured data can be sent to the background for data analysis and evaluation later.

[0030] As Figure 2 shown, the optical fiber reflection device 6 in this embodiment mainly includes a splitter 61. The splitter 61 divides the input end signal into two paths, one of which is used as the output end and the other is the reflection end. The input end of the splitter 61 is connected to the optical splitter 3 through an optical output interface, the output end is connected to the optical network unit 4 through an optical input interface, and the reflection end is connected to the reflector 63 after passing through a filtering device. Among them, the optical input interface and the optical output interface adopt APC interfaces. The filtering device adopts an optical fiber grating 62, and the central wavelengths of the optical fiber gratings 62 of the optical fiber reflection devices in the test system are different. A coating is provided on the surface of the reflector 63, and the reflectivity is greater than or equal to 90%; the splitting ratio of the reflection end to the output end of the splitter 61 is 2:98 to 7:93, which can ensure accurate detection results while minimizing the attenuation of normal signal propagation as much as possible.

[0031] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. An NG-PON device testing system for detecting devices in an NG-PON network composed of an optical line terminal (1), a wavelength division multiplexer (2), an optical splitter (3), and an optical network unit (4) connected in sequence through optical fibers, characterized in that, The test system includes an optical time domain reflectometer (5) with adjustable output wavelength and a plurality of optical fiber reflection devices (6); The optical time domain reflectometer (5) is arranged on one side of the optical line terminal (1) and connected to the wavelength division multiplexer (2); The plurality of optical fiber reflection devices (6) are arranged between the optical splitter (3) and the optical network unit (4) of the NG-PON network, and the wavelengths reflected by each optical fiber reflection device (6) are different.

2. The NG-PON device test system according to claim 1, wherein An optical fiber reflection device (6) is arranged between each optical network unit (4) and the optical splitter (3) in the NG-PON network.

3. The NG-PON device testing system according to claim 2, wherein, The optical fiber reflection device (6) is arranged at one end close to the optical splitter (3).

4. The NG-PON device test system according to claim 1, wherein The optical fiber reflection device (6) includes a splitter (61), which divides the input signal into two paths, one path as the output end and the other path as the reflection end. The input end of the splitter (61) is connected to the optical splitter (3) through an optical output interface, the output end is connected to the optical network unit (4) through an optical input interface, and the reflection end is connected to the reflector (63) after passing through the filtering device.

5. The NG-PON device test system according to claim 4, characterized in that, The filtering device is an optical fiber grating (62).

6. The NG-PON device test system according to claim 5, wherein The central wavelengths of the optical fiber gratings (62) of the optical fiber reflection devices in the test system are all different.

7. The NG-PON device test system according to claim 1, characterized in that A coating is provided on the surface of the reflector (63), and the reflectivity is greater than or equal to 90%.

8. The NG-PON device test system according to claim 4, characterized in that, The splitting ratio of the reflection end to the output end of the splitter (61) is 2:98 to 7:

93.

9. The NG-PON device test system according to claim 1, characterized in that, The optical input interface and the optical output interface of the optical fiber reflection device (6) are APC interfaces.

10. The NG-PON device test system according to claim 1, characterized in that, The optical splitter (3) in the NG-PON network is connected to an upstream and downstream data acquisition module (7) for data.

Images