Optical network unit photoelectric device with optical time domain reflection function

Abstract

The invention discloses an optical network unit (ONU) photoelectric device with an optical time domain reflection function. The photoelectric device comprises a laser used for emitting up light, a photoelectric detector used for receiving an optical signal, and an optical interface used for external connection with a fiber. Along an optical axis direction of the optical interface, the photoelectric device is provided with a first wavelength division multiplexing element inside. The up light and down light can fully penetrate through the first wavelength division multiplexing element, an optical time domain detection signal used for optical time domain reflection is fully or partly reflected, and an optical time domain detection signal which penetrates through the first wavelength division multiplexing element returns to a fiber through the optical interface. According to the invention, a reflection function to the optical time domain detection signal is integrated in the ONU photoelectric device used in an optical network, real-time accurate on-line monitoring of each path of ONU by an OLT (optical line terminal) of a PON (passive optical network) system local side is realized, fault diagnosis of an optical network line by a service provider and positioning and detection of an ONU user are facilitated, and operation cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to an active optoelectronic device for optical communication, in particular to an optoelectronic device with an optical time domain reflection function applied in an optical network unit. Background technique [0002] In recent years, FTTx (FTTH, FTTB, FTTC, etc.) broadband networks based on optical fiber communication have developed rapidly by virtue of their ability to provide users with high-speed voice, data and video services. However, the contradiction between the operator's supervision of users and the location and detection of optical network link event points has become increasingly prominent. [0003] At present, when the optical line terminal (OLT) as the central office detects the optical network unit (ONU) as the user end, it mainly uses the data flow of the user to identify it, and cannot accurately locate and monitor the user. [0004] The optical time do...

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Problems solved by technology

[0005] However, the existing ONU module at the user end does not have clear requirements for the reflection of the OTDR detection signal at the central office in terms of device design. The reflection of the device to the OTDR detection signal is not fixed and clear. It depends on the accidental factors when the device is packaged. Therefore, most monitoring and line fault judgments are inaccurate, with large errors, and frequent misjudgments and missed judgments.

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