A passive optical network burst mode receiver signal detection circuit device and method

Abstract

The invention relates to a signal detection circuit structure and method of a passive optical network burst mode receiver. The circuit structure includes an amplification module, a signal amplitude detection module, a signal detection judging module, a drive module and a signal discrimination module. According to the invention, since the signal discrimination module is added in a limiting amplifier of the burst mode receiver, through comparing noise and a lead code, valid signals are recognized, so that error rate of valid signal detection is reduced greatly. Compared with a traditional method of increasing amplitude limiting amplifier threshold value voltage, sensitivity index of the receiver is not lowered. Besides, since signal discrimination is performed in a front lead code time period, only 2 bit time length is required. Thus, the structure and method provided by the invention can be widely applied to the high speed optical line terminal burst mode receiver.

Description

technical field [0001] The invention relates to an information detection circuit and a method, belonging to the technical field of communication, in particular to a detection circuit device and method of a passive optical network burst signal, which can be used for identification and detection of noise, interference and burst signals. Background technique [0002] Typical uplink transmission of Passive Optical Network (PON) adopts Time Division Multiple Access (Time Division Multiplex Address, TDMA) method, such as figure 1 As shown, the optical signals sent by multiple optical network terminals (Optical Network Terminator, ONT) enter the optical line terminal (Optical Line Terminator, OLT) after passing through the optical distribution network (Optical Distribution Network, ODN), so it can be seen that the OLT The end receiver works in burst mode. [0003] The circuit architecture of a typical OLT receiver, such as figure 2 As shown, the photodiode converts the received ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a circuit device and method for identifying signals of burst mode receivers in passive optical networks, which solves the problem of the traditional BM-LA detection signal algorithm and circuit architecture under the influence of noise and interference. Signal detection is prone to errors, which reduces the probability of valid signal detection errors

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