TWI273223B - Apparatus for detecting breaking of fiber-optic closed loop for a passive optical network (PON) system - Google Patents

Abstract

An apparatus for detecting breaking of fiber-optic closed loop for a passive optical network PON (passive optical network) system is presented, it uses the fiber bragg grating to detect intensity of a reflected lightwave, and to determine whether the fiber-optic closed loop is broken or not and whether the light loss thereof is too large, so as to differentiate the electrical system control from the fiber-optic closed loop in determining which one is faulty; this invention uses 1550 nm fiber bragg grating (FBG) as the main component in corporation with the 1550 nm optical band-pass filter, the optical circulator, the adjustable laser source and the optical power meter together to constitute a the detecting apparatus. The detecting apparatus is a low-cost technology of fiber-optic closed loop and can be abundantly reproduced and fabricated, and can be used in a general control room to determine whether the user's fiber-optic closed loop is broken or not and whether the light loss thereof is too large, so as to enormously reduce the cost of maintenance and repair outside.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passive optical network PON system optical fiber loop disconnection detection device, in particular to a low cost and easy to use passive optical network PON system optical fiber The circuit disconnection test and device are equipped with the fiber-to-the-home passive optical network PON system. When there is a problem in the system, it can detect whether the optical user circuit is disconnected and the optical fiber optical loss is too large. It is clear that there is a problem with the electrical system control or the optical fiber loop, which can greatly reduce the outdoor maintenance and repair. [Prior Art] / With the rapid growth of the global Internet, traditional networks have been unable to cope with the demand for the idling information transmission application caused by the communications revolution. The maturity of the optoelectronic industry technology and the diversification of product applications are timely and eager to grow. The vast bandwidth required for the global Internet, high-quality multimedia networks, and various data communications provides the best solution. Various optical LAN transceivers with LAN (Local AreaNetw〇rk) ^ and MAN (Metr〇P〇litanAreaNetworl〇 network contain unlimited business opportunities, this low-cost optical transceiver module will be the future The main axis of the optical communication network system development. Among them, the passive optical network P〇N system is the most favored. In order to cooperate with the future of the PON system, it is necessary to invent the optical fiber user circuit of the passive optical network P0N system. Whether it is disconnected. At present, the market is still mainly using the software power-on system in the system for automatic detection. Therefore, when there is a problem in the system, it is impossible to confirm that it is an electrical system control problem, or that the optical fiber loop has a problem, and it is difficult to detect it. It is not a good design, and it needs to be improved. The inventors of this case, in view of the above-mentioned conventional technologies, have to solve the problems to be solved.

Claims (1)

1273223 〉月曰修(more) is replacing the purchase ten, the scope of patent application: -- 1_ A passive optical network PON system fiber loop disconnection detection device, the application of fiber grating to the light reflection and transmission characteristics combined with the light band Optical components such as a pass filter, an optical circulator, an adjustable laser light source, and a light wave optical power meter, respectively, construct a detection device for the optical fiber loop disconnection of the passive optical network PON system, and detect the optical power reflected by the light wave according to different The intensity response is shown to determine if the fiber loop is broken and the optical loss of the fiber loop is excessive. 2. The detecting device for the optical fiber loop disconnection of the passive optical network PON system according to claim 1, wherein the wavelength of the fiber grating component is a general wavelength wavelength multiplexing (WAVELENGTH DIVISION MULTIPLEXING, WDM) commonly used wavelength 1550 nm It can avoid the i490nm wavelength used for OLT digital transmission. 3. The detecting device for the optical fiber loop disconnection of the passive optical network PON system according to claim 1, wherein the fiber grating can be combined with different types of optical connectors, and connected to the optical connector of the optical network unit, Any PON fabric device needs to be changed. 4_ Detecting device for optical fiber loop disconnection of a passive optical network PON system according to claim 1, wherein the same set of wavelength fiber gratings are used for different optical line terminals, corresponding to multiple sets of optical lines In the terminal system, only one set of detecting devices is needed to detect the fiber loop of any optical network unit of any one of the optical line terminals. 5 As claimed in claim 1, the passive optical network pon system optical fiber loop disconnection detecting device, wherein the adjustable laser light source and the optical wave power meter can be programmed to be used as an optical loop automatic detection of the PON system. Monitoring and monitoring system. 12 Λ2Ί3223 XI, schema: _ 15a Figure 4