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Optical line terminal and method for processing amplified spontaneous emission by same

A technology of amplifying spontaneous radiation and optical line termination, applied in the field of passive optical network, can solve problems such as EQD not received, not received, BCDR lost lock, etc., and achieve the effect of ensuring smooth registration

Active Publication Date: 2014-11-05
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0004] However, the commonly used OA will generate amplified spontaneous emission (Amplified Spontaneous Emission, ASE) when it is powered on. When the receiver at the OLT end is equipped with an OA, as long as the OA is powered on, there will be ASE output in the upstream direction. When the upstream optical signal from the ONU does not come up and the power of the ASE exceeds the SD threshold, it will cause the SD to be falsely triggered to generate a high level, thereby resetting the optical module and BCDR early. On the one hand, the BCDR will lose lock. The decision level is not reliable, so when the ONU's real upstream optical signal comes up, it may cause GMAC analysis errors, and eventually the ONU cannot receive the ONU-ID within the specified time, or cannot receive the EQD (Equalization Delay, equalization delay), thus affecting the registration of ONU

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  • Optical line terminal and method for processing amplified spontaneous emission by same
  • Optical line terminal and method for processing amplified spontaneous emission by same
  • Optical line terminal and method for processing amplified spontaneous emission by same

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Embodiment Construction

[0024] For the above-mentioned problem that ASE affects the normal registration of ONU, the system and method for processing amplified spontaneous emission provided by the embodiment of the present invention can eliminate the interference caused by ASE to ONU registration, and ensure the smooth registration of ONU.

[0025] The system and method for processing amplified spontaneous emission and the optical line terminal provided by the embodiments of the present invention aim at the above-mentioned problem that the optical power of the ASE may exceed the threshold of the SD, which may cause the SD to be falsely triggered to generate a high level. Two solutions are proposed: 1. On the one hand, reduce the optical power output from the ASE to the optical module; on the other hand, increase the threshold of the SD, so that the phenomenon that the ASE accidentally triggers the SD to generate a high level can be eliminated.

[0026] Specifically, the system for processing amplified ...

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Abstract

An optical line terminal, including: an optical power amplification module (501), an optical power attenuation module (502), an optical power attenuation magnitude control module (503) and an optical module (504). The optical power amplification module (501), the optical power attenuation module (502) and the optical module (504) are connected successively. The input end of the optical power attenuation magnitude control module (503) is connected to the optical module (504), and the output end thereof is connected to the optical power attenuation module (502). The optical power attenuation module (502) is used for reducing the optical power of amplified spontaneous emission generated by the optical power amplification module (501), the optical module (504) is used for converting the amplified spontaneous emission after being attenuated by the optical power attenuation module (502) into an electric signal and outputting signal detection information, and the optical power attenuation magnitude control module (503) is used for receiving the signal detection information emitted by the optical module (504) and controlling the attenuation magnitude of the optical power attenuation module (502) in real time. A method for processing amplified spontaneous emission.

Description

technical field [0001] The invention relates to passive optical network technology, in particular to an optical line terminal and a method for processing amplified spontaneous radiation. Background technique [0002] Applying OA (Optical Amplifier, Optical Amplifier) ​​to expand optical power is a common method to achieve fiber length extension and branch ratio expansion in Passive Optical Network (PON), specifically, as figure 1 As shown, in the prior art, the optical power is expanded by placing the OA at the optical line terminal (Optical Line Terminal, OLT) side of the central office, while keeping the ODN (Optical Distribution Network, Optical Distribution Network) in the PON passive. [0003] Such as figure 2 As shown, in the upstream registration process of the ONU (Optical Network Unit, Optical Network Unit), the OLT relies on the SD (Signal Detect, Signal Detection) provided by the optical module to detect that the upstream optical power reaches a certain threshol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/14H04B10/293
CPCH04B10/272
Inventor 彭桂开周小平林华枫徐之光钱银博
Owner HUAWEI TECH CO LTD
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