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System and method for being compatible to broadcasting service in colorless wavelength division multiplexing passive optical network

A passive optical network and broadcasting service technology, applied in the field of wavelength division multiplexing passive optical network (WDM-PON) compatible broadcasting service, can solve the problems of limited rate and large power loss, and reduce the limit of extinction ratio , The effect of easy network and convenient wavelength management

Inactive Publication Date: 2013-10-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current solution to this problem is to allocate a specific shared wavelength for the broadcast signal or provide a broadband light source are common methods, but there are also various problems such as large power loss and limited rate.

Method used

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  • System and method for being compatible to broadcasting service in colorless wavelength division multiplexing passive optical network
  • System and method for being compatible to broadcasting service in colorless wavelength division multiplexing passive optical network

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Embodiment 1

[0014] see figure 1, the colorless wavelength division multiplexing passive optical network WDM-PON compatible broadcasting service system consists of an optical line terminal OLT (1) through two single-mode optical fibers - the first single-mode optical fiber (26) and the second single-mode optical fiber The mode fiber (27) is connected to the remote node RN (28), and the remote node RN (28) is connected to two groups of optical network units (33, 34). The optical line terminal OLT (1) is two multi-wavelength lasers MFL (2, 3) connected to the first interferometer filter (7) and the second interferometer filter (7) and the second interferometer instrument filter (8), the two Mach-Zehnder modulators MZM are driven by a sine wave generator (6). The two output ports of the first interferometer filter (7) are respectively connected to a first 1xN arrayed waveguide grating AWG (9) and the first phase modulator PM (16), the first 1xN arrayed waveguide grating AWG (9) The N outpu...

Embodiment 2

[0016] The method for a colorless wavelength division multiplexing passive optical network compatible broadcasting service adopts the above-mentioned system for broadcasting, and the first multi-wavelength laser (2) and the second multi-wavelength laser (3) in the optical line terminal OLT (1) ) emits N wavelengths at the same time and the emitted wavelengths are short-wave bands and long-wave bands in different bands. The short-wavelength wavelength emitted by the first multi-wavelength laser is modulated by the radio frequency signal generated by the sine wave generator (6) to generate a double-sided band subcarrier multiplexing (DSB-SCM) signal; after the signal enters the first interferometer filter IL (7), a The port outputs N double-sideband subcarriers, and then demultiplexes and outputs multiple short-wave band wavelengths for downlink signal modulation through the first arrayed waveguide grating AWG (9), and the other port outputs N optical carriers in the short-wave b...

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Abstract

The invention relates to a system and method for being compatible to broadcasting service in a colorless wavelength division multiplexing passive optical network. The system provided by the invention comprises an optical line terminal OLT, wherein the optical line terminal OLT is connected with a remote node RN through two single mode fibers; the remote node RN is connected to two groups of optical network units ONU; the optical line terminal OLT mainly comprises two multi-wavelength optical sources, two sine-wave generators, two optical interferometer filters, multiple array waveguide gratings AWG, two optical circulators, two optical couplers and multiple modulators; the remote node RN only comprises two array waveguide gratings AWG; the optical line terminal OLT can simultaneously realize the transmission of ascending and descending service and broadcasting service; and each ONU can receive broadcasting signals and descending point-to-point signals at different frequency bands and simultaneously modulates the optical sources carried with the broadcasting signals again to finish the ascending transmission. In the invention, the transmission of the ascending and descending service and the broadcasting service can be simultaneously realized by utilizing a subcarrier wave technique and changing the structure of the system, and the system provided by the invention is enabled to reach the 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) compatible broadcasting services. Background technique [0002] In recent years, a series of optical access network concepts such as EPON, GPON, and Hybrid WDM / TDM-PON have developed rapidly. Although WDM-PON has only been deployed on a small scale in South Korea, research institutions in various countries are still optimistic about the application of WDM-PON in access networks. The access network is close to the user end and is very sensitive to cost. Therefore, the key problem that WDM-PON urgently needs to solve at present is how to reduce the cost as much as possible. The high cost is also a stumbling block that hinders the long-term development of WDM-PON. The introduction of DWDM into the passive optical network PON can not only provide greater bandwidth, but also enhance the tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00H04J14/02
Inventor 马雪娇甘朝钦陈本阳
Owner SHANGHAI UNIV
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