Constant emitting detecting and overcoming method and device of optical module in EPON (Ethernet Passive Optical Network)

Abstract

The invention provides a constant emitting detecting and overcoming method of an optical module in an EPON (Ethernet Passive Optical Network). By using a logic programming module, the constant emitting detection of the optical module is finished while a control signal is generated to control a sending power of the optical module to reset. The device comprises an optical network unit, wherein the optical network unit comprises the optical module, an optical module power control unit, a central processing unit (CPU) and a logic control unit. The technical scheme provided by the invention is mostly applied to an MDU (Message Decode Unit) with a logic device (an FPGA (Field Programmable Gate Array) or a CPLD (Complex Programmable Logic Device)); with respect to the traditional analog circuit implementation method, the constant optical detection of the optical module and the turn-off of the sending power are realized by adopting the logic programming method; the method is cost-saving, stable and reliable in performance, adjustable in time threshold of constant emitting, and unrelated to the constant emitting protection and the flow; in addition, the protection is free from the influence of temperature and device parameter changes.

Description

technical field [0001] The invention belongs to the technical field of passive optical fiber communication, and particularly relates to a method for detecting and automatically overcoming long light-emitting modules in EPON, and a device for realizing the function of the method. The device is based on logic-programmed optical network unit optical modules with long light Detect and transmit power off. Background technique [0002] Passive optical fiber Ethernet, EPON (Ethernet Passive Optical Network), a point-to-multipoint optical fiber access technology, has been widely used in recent years due to its mature technology, low cost, green energy saving, long distance and high bandwidth. Not only has it become the preferred technical solution for access networks such as fiber-to-the-home FTTH and fiber-to-the-building FTTB, but fiber access has entered large-scale commercial use. [0003] The optical network unit is the optical node ONU (Optical Network Unit) is the terminal e...

AI Technical Summary

Problems solved by technology

[0005] 1) The circuit parameters are related to the driving mode of the Tx_SD signal inside the optical module, and the circuit parameters may need to be adjusted for different optical modules;

[0006] 2) When the duty cycle of the Burst signal is close to 1 in large flow, it may malfunction;

[0007] 3) The protection action time cannot be adjusted by software;

[0008] 4) Circuit parameters are easily affected by temperature changes;

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