Huawei Technologies Co., Limited

Juan Chen

Hao Wang

Xing Hu

Shimin Zou

Congqi Li

Jianlin Zhou

Hongli Jiang

Teng Ma

Hanguo Li

Yiquan Lu

Changchun Li

Embodiments of the present invention disclose a method and a system for realizing PON reach extension, and a relay apparatus for realizing this method. The method includes: extracting an overhead in an upstream data stream that is sent by an ONU to an OLT, obtaining a payload in the upstream data stream through de-mapping, and storing it into a buffer; extracting bandwidth authorization information in an downstream data stream that is sent by the OLT to the ONU; and reorganizing a stored payload according to the bandwidth authorization information and inserting a corresponding overhead to generate a new upstream data stream and send it to the OLT.

Method, system, and relay apparatus for realizing passive optical network reach extension

A method, a device, and a system for realizing data transmission extension in a passive optical network (PON) are provided. Between a burst-mode clock and data recovery (BCDR) module and an electrical-optical (E/O) amplification module, the device includes a delimiter matching module and a preamble buffering and compensating module. The delimiter matching module is adapted to receive a data frame sent by the BCDR module and determine a location of a delimiter in the data frame. An optical-electrical (O/E) amplification module performs O/E conversion, amplification, and shaping on the data frame. The BCDR module then performs clock and data recovery processing on the data frame. The preamble buffering and compensating module is adapted to receive and buffer the data frame output from the delimiter matching module, insert a compensation preamble in the data frame according to the location of the delimiter in the data frame determined by the delimiter matching module, and send the data frame to the E/O amplification module according to a retiming clock of a downstream direction. Therefore, the data transmission extension is realized in an optical-electrical-optical (OEO) manner.

Method, system and device for realizing data transmission extension in passive optical network

Methods and apparatuses for automatic restoration detection and automatic restoration of optical communication system are disclosed. In the methods, a first station sends an automatic restoration detection message to a second station at the opposite side of a failed link; in response to receiving an automatic restoration request message, determines that the link has been repaired in two directions, and sends an automatic restoration confirmation message to the second station; or in response to receiving the automatic restoration detection message, determines that the link from the second station to the first station has been repaired, and sends the automatic restoration request message to the second station; in response to receiving the automatic restoration confirmation message, determines that the link has been repaired in two directions; and switching to normal working states. The safety problem that the laser leakage occurs in the failed link is solved.

Method and apparatus for automatic restoration detection and automatic restoration of optical communication system

The invention discloses a method for implementing power equalization of a DWDM system, comprises: Measure and calculate, respectively, a gain spectrum characteristic curve of an optical power booster amplifier unit and a loss spectrum characteristic curve of a loss device with related wavelengths in the DWDM system; Subtracting the loss spectrum characteristic curve from the gain spectrum characteristic curve to obtain a difference curve, taking the complement curve of the difference curve as a loss characteristic target curve of a GFF; Setting in the optical power booster amplifier unit a GFF having loss characteristic curve coinciding with the loss characteristic target curve. The invention synthetically considers gain spectrum of an optical power booster amplifier unit and loss spectrum of a loss device with relating wavelengths to define a loss characteristic curve which a GFF should have. In this way, optical power flatness of every channel is effectively guaranteed. Therefore, transmission link flatness of whole system is guaranteed, and channel optical power equalization property of a system is further improved.

Method for implementing power equalization of dense wavelength division multiplexing system

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Shenzhen, China

Juan Chen