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System and method for realizing wavelength reusing and broadcasting functions of wavelength division multiplexing passive optical network

A passive optical network and wavelength division multiplexing technology, applied in the field of optical communication, can solve the problems of limited rate, uplink and downlink loss of optical power, high price, etc., to reduce system cost, realize wavelength reuse, and flexible structure. Effect

Inactive Publication Date: 2012-07-04
SHANGHAI UNIV
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Problems solved by technology

However, in the WDM-PON network using this scheme, due to the uplink and downlink round-trip loss of optical power, the power budget problem is a very critical issue
But these methods have various disadvantages, such as high price, limited rate, etc.

Method used

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  • System and method for realizing wavelength reusing and broadcasting functions of wavelength division multiplexing passive optical network
  • System and method for realizing wavelength reusing and broadcasting functions of wavelength division multiplexing passive optical network
  • System and method for realizing wavelength reusing and broadcasting functions of wavelength division multiplexing passive optical network

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Embodiment Construction

[0017] In conjunction with the description of the accompanying drawings, an implementation example of the present invention is as follows:

[0018] see figure 1 , the wavelength division multiplexing passive optical network WDM-PON realizes the broadcast function system by an optical line terminal OLT 1, which is connected to the remote node RN 13 through two single-mode optical fibers (single-mode optical fiber I11, single-mode optical fiber II12) , and the remote node RN (13) is connected to two groups of optical network units (GroupⅠ23, GroupⅡ24), the optical line terminal OLT 1 ​​is composed of 2n DFB lasers 4, 2n optical couplers 5, 2n intensity modulators 6, It consists of 2n optical receivers 10 , a 2x2N arrayed waveguide grating AWG 2 , a 1x2N arrayed waveguide grating AWG 3 and 2n optical circulators 7 . Wherein the remote node RN 13 includes two filters (the first optical filter 14, the second optical filter 17), a 1x2 fiber coupler 16, three optical circulators (th...

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Abstract

The invention relates to system and method for realizing wavelength reusing and broadcasting functions of a wavelength division multiplexing passive optical network. An OLT (Optical Line Terminal) is adopted in the system and connected with an RN (Remote Node ) through two single-mode optical fibers, and the RN is connected with two groups of ONUs (Optical Network Units, wherein the RN mainly comprises two optical filters, three optical circulators, an optical coupler and two 2*N AWGs (Array Waveguide Gratings); the separation and the path integration of uplink and downlink signals can be realized at the position of the RN, and each ONU can simultaneously receive broadcasting signals and point-to-point data signals; and the invention realizes the transmitting and wavelength reusing functions of the broadcasting signals only by changing the structure of the system and enables the system to achieve an equilibrium between the cost and the performance.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a system and method for wavelength division multiplexing passive optical network (WDM-PON) to realize wavelength reuse and broadcasting functions. Background technique [0002] Wavelength division multiplexing passive optical network WDM-PON technology can upgrade the bandwidth without changing the physical infrastructure equipment, and greatly increase the transmission capacity of the network. It has broad application prospects in the optical access network and is considered to be the future of FTTx. The ultimate choice for evolution. WDM-PON assigns one (or a pair) of wavelengths to each ONU for communication, thus realizing virtual point-to-point transmission between ONU and OLT, but this transmission method makes point-to-multipoint broadcast signal transmission more difficult. And setting a laser with a specific wavelength for each ONU will lead to high cost of the syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00H04J14/02H04B10/12H04B10/25
Inventor 杨登峰甘朝钦曹娅婻阮浩
Owner SHANGHAI UNIV
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