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Reconfigurable optical add-drop multiplexer on basis of OFDMA (Orthogonal Frequency Division Modulation)

A technology of optical add-drop multiplexer and polarization beam splitter, which is applied in the field of optical communication, can solve the problems such as the decrease of the utilization rate of adjacent frequency band intervals, the interference of adjacent frequency bands of add-drop multiplexers, and residual interference signals, etc., to achieve The effect of improving frequency band utilization, reducing requirements, and ensuring orthogonality

Inactive Publication Date: 2012-12-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a reconfigurable optical add-drop multiplexer based on OFDMA, so as to overcome the limitations of filters in the prior art and cause the add-drop multiplexer to have adjacent frequency band interference and the adjacent frequency band interval is relatively large Causes a decrease in frequency band utilization, and when implementing the add (insert) function, it is necessary to remove the frequency band at the corresponding position and then insert a new frequency band, which will leave some defects of interference signals

Method used

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  • Reconfigurable optical add-drop multiplexer on basis of OFDMA (Orthogonal Frequency Division Modulation)

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Embodiment 1

[0052] figure 2 It is a structural diagram and a schematic diagram of a frequency spectrum of a specific implementation of the OFDMA-based reconfigurable optical add / drop multiplexer of the present invention.

[0053] Such as figure 2 As shown, in this embodiment, a fixed allocation method is adopted. The central node CN that realizes the reconfigurable optical add / drop multiplexer (ROADM) in the case of fixed distribution is figure 1 In the second central node CN2, all central nodes have the same structure. Here, take the second central node CN2 as an example. The so-called fixed allocation means that each remote node RN only needs a certain fixed service. For example, the remote node RN1 only needs the data of the frequency band Band1, and the remote node RN2 only needs the data of the frequency band Band2, and each remote node RN needs different services. In this case, each central node CN does not need to carry all the signals, and the frequency band required by the remote...

Embodiment 2

[0059] image 3 It is the structure diagram and the frequency spectrum diagram of another specific implementation of the OFDMA-based reconfigurable optical add / drop multiplexer of the present invention.

[0060] Such as image 3 As shown, in this embodiment, a dynamic allocation method is adopted. In the case of dynamic allocation, the central node CN of the reconfigurable optical add / drop multiplexer (ROADM) is the second central node CN2, and all central nodes have the same structure. Here we still take the second central node CN2 as an example. The so-called dynamic allocation means that each remote node RN can require any type of service, a certain type of service is not fixed to a certain remote node RN, and the service distribution is performed dynamically according to demand. The main difference between it and fixed allocation is that each central node CN needs to carry signals of all frequency bands.

[0061] In this embodiment, the configuration of the multi-band OFDM sig...

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Abstract

The invention discloses a reconfigurable optical add-drop multiplexer on the basis of the OFDMA (Orthogonal Frequency Division Modulation). A multitape OFDM signal is divided into uplink and downlink OFDM signals by a polarization beam splitter and add and drop functions are respectively implemented by an optical coupler and a band-pass filter; and finally, a novel multitape OFDM signal is synthesized by a polarization beam combiner and is output. According to the multitape OFDM signal, frequency bands in an X polarization direction and frequency bands in a y polarization direction are distributed in an interleaved mode and are respectively used as the distributed uplink and downlink OFDM signals and an interval between each two frequency band is equal to an interval between each two subcarrier in each frequency band, so that the utilization rate of the frequency bands is improved; and meanwhile, the interference of the adjacent frequency bands cannot be generated to the separation (extraction) of the required frequency band, so that the requirement on the filter is also reduced. Meanwhile, the inserted frequency bands are inserted into the uplink OFDM signal in the other polarization direction, i.e. the x direction, without removing the frequency bands at the corresponding positions, and thus, the influence of interference signals is overcome.

Description

Technical field [0001] The present invention belongs to the field of optical communication technology, and more specifically, relates to a reconfigurable optical add / drop multiplexer based on OFDMA (Orthogonal Frequency Division Multiple Access). Background technique [0002] In recent years, with the increasing demand for bandwidth from residential and commercial users, service providers are forced to provide wider capacity to end users, making optical fiber access technology the most promising technology in the market. As a modulation method with high spectrum utilization, Orthogonal Frequency Division Multiplexing (OFDM) is widely used in transmission and access networks. Orthogonal frequency division multiplexing is a special frequency multiplexing technology that uses multi-carrier modulation. The essential idea of ​​this technology is: divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modu...

Claims

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Application Information

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IPC IPC(8): H04J14/02H04L27/26G02B6/293G02B6/27
Inventor 张崇富陈晨张琼丽刘德明邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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