Passive optical network system, optical line terminal and transmission method of optical signals

Abstract

The invention discloses a passive optical network system, an optical line terminal and a transmission method of optical signals and belongs to the field of communication. The system comprises the optical line terminal and an optical fiber distribution network. The optical line terminal comprises at least two emitters and at least one optical receiver, wherein each emitter is connected to a wide interval wavelength division multiplexer which corresponds to the emitter. In a downlink direction, downlink optical signals transmitted by the emitters are input from a first port of the correspondingwide interval wavelength division multiplexer and the downlink optical signals output from a second port of the corresponding wide interval wavelength division multiplexer are transmitted to a user terminal; and in an uplink direction, uplink optical signals from the user terminal are input from the second port of the corresponding wide interval wavelength division multiplexer and output from a third port of the wide interval wavelength division multiplexer, and then the uplink optical signals output from the third port are received and processed by the optical receiver. The passive optical network system, the optical line terminal and the transmission method of the optical signals can protect the investment of the prior equipment and reduce the networking cost.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a passive optical network system, an optical line terminal and a transmission method for optical signals in the passive optical network. Background technique [0002] At present, passive optical network PON (Passive Optical Network) technology has been used in broadband passive optical network BPON (Broadband Passive Optical Network), Ethernet passive optical network EPON (Ethernet Passive Optical Network) and gigabit passive optical network GPON (Gigabit -Capable Passive Optical Network) is deployed. [0003] BPON was originally developed and standardized. ITU-T.G982, ITU-T.G983.1 and ITU-T.G983 issued by the International Telecommunication Union Telecommunication Standardization Department in ITU-T (ITU-T, International Telecommunication Union-Telecommunication Standardization Sector) .3 describes the standardization content on BPON. However, BPON service adaptation an...

AI Technical Summary

Problems solved by technology

The disadvantages of this solution are: 1) the uplink and downlink power budgets are poor; 2) the downlink transmitter must be upgraded to a dense wavelength division multiplexing DWDM (Dense Wavelength Division Multiplexing) type laser, which greatly increases the cost; 3) hybrid optical splitter (Hybrid Splitter) has a large volume and cannot meet all deployment scenarios. If there is no cabinet (cabinet), the hybrid splitter cannot be assembled

The disadvantages of this solution are: 1) The uplink and downlink power budgets are poor; 2) The downlink transmitter must be upgraded to a DWDM type laser, which greatly increases the cost

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