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Optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and optical add drop multiplexer

An optical add-drop multiplexer and optical add-drop multiplexing technology, applied in the field of optical networks, can solve the problems that OADM optical add-drop multiplexing cannot be used, and cannot be separated by optical filtering.

Inactive Publication Date: 2015-07-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Therefore, the optical transmission system based on OOFDM technology cannot be separated by optical filtering because the spectrum overlaps with each other.
Therefore, for the OOFDM optical transmission system, at the optical network node, the traditional OADM used in the DWDM transmission system cannot be used to realize optical add-drop multiplexing

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  • Optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and optical add drop multiplexer
  • Optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and optical add drop multiplexer
  • Optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and optical add drop multiplexer

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[0021] The basic functions of the OADM include three items: multiplex the wavelength channels required by the drop channel into the add channel signals, and allow other wavelength channels to pass through as unaffected as possible. In an OOFDM signal, each optical subcarrier can be regarded as a wavelength channel. OADM function schematic diagram of the present invention is as image 3 As shown, the input OOFDM signal is first demultiplexed by N-point Optical Fast Fourier Transform (OFFT) to realize photon carrier separation. The optical demultiplexing module includes an optical Fourier transform module and an optical gate; the optical Fourier transform module realizes the optical separation of the photon carriers in the input OOFDM signal through the optical Fourier transform; the optical gate pair undergoes the optical Fourier transform The effective signal part of the demultiplexed photon carrier signal is gated and output to the drop end or the optical filtering and shapi...

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Abstract

The invention provides an optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and an optical add drop multiplexer. The method includes that an optical demultiplexing module demultiplexes the photonic carriers in the OOFDM signals input through optical Fourier transformation to realize photonic carrier signal separation, valid signal portions after separating are selected by an optical gate, the photonic carrier signals selected to be output are taken as downlink optical signals to be output through a downlink end, and the rest photonic carriers are taken as through photonic carriers to be input to an optical multiplexing module after optical filtering shaping. Adopting the optical Fourier transformation effectively realizes a demultiplexing function of OOFDM signal photonic carriers. The photonic carriers in the OOFDM signals are mutually orthogonal, so that the separated photonic carriers are still mutually orthogonal after being demultiplexed by adopting the OFFT technology, and other photonic carriers are unaffected after the downlink end outputs needed photonic carrier signals.

Description

technical field [0001] The invention relates to optical communication technology, in particular to optical network technology. Background technique [0002] In the past ten years, in order to construct a cost-effective high-speed optical transmission network, wavelength division multiplexing (Wavelength division multiplexing, WDM) has been widely used. With the development of single-channel optical transmission to 400G / 1T, the signal bandwidth (especially 1Tbps signal) will exceed the existing ITU-T DWDM wavelength interval, and the frequency interval of WDM system needs to be redefined to meet the transmission requirements of future single-channel Tbps signal . Similar to WDM, Optical Orthogonal Frequency Division Multiplexing (OOFDM) is also a frequency domain multiplexing technology. However, in the OOFDM technology, the subcarriers are orthogonal to each other, and the spectrum can be seamlessly connected, which greatly improves its spectrum utilization. OFDM technolo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04L27/26
Inventor 易兴文张静张洪波邓明亮邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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