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Polarization interference-based full-light OFDM signal multiplexing and demultiplexing device

A technology of demultiplexing and polarized light, applied in the directions of light guides, optics, optical components, etc., can solve the problems of difficult OFDM signal implementation, complex device structure, no scalability, etc., and achieve mature technology, strong flexibility, and scalability. strong effect

Inactive Publication Date: 2011-05-04
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

Both of the above two device structures are relatively complex and have no scalability. It is difficult to implement multiplexing and demultiplexing processing for OFDM signals containing a large number of subcarriers, and the cost is high.
In addition, the thermo-optic effect of the silicon-based waveguide is used in the coupler structure to introduce the phase shift of each branch, which is more complicated to realize; the structure of the waveguide grating routing device is fixed, there is no adjustable function, and the flexibility is poor

Method used

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  • Polarization interference-based full-light OFDM signal multiplexing and demultiplexing device
  • Polarization interference-based full-light OFDM signal multiplexing and demultiplexing device
  • Polarization interference-based full-light OFDM signal multiplexing and demultiplexing device

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] figure 1It is a functional schematic diagram of the basic unit of the device of the present invention. The polarization beam splitter performs polarization splitting on the input signal, and after delay and phase shift processing, two beams of linearly polarized light with a phase difference are obtained. The polarization interference effect occurs between the two, and the output result after multi-level interference is equivalent to the OFFT operation function. When the device is used upside down, it is equivalent to the OIFFT operation function. The transfer function of the basic unit is:

[0034]

[0035] in is produced by a time-delay crystal, and the length of the time-delay crystal in the k-th basic unit is:

[0036] ( k is a positive integer and ) (1)

[0037] c is the speed of light, is the crystal birefringence difference;

[0038] a...

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Abstract

The invention relates to a device for multiplexing and demultiplexing an orthogonal frequency division multiplexing (OFDM) signal by using a polarization interference principle. A demultiplexing device consists of (N-1) basic structural units in a cascade mode, wherein N is the number of subcarriers of the OFDM signal, and an optical signal is subjected to polarization beam splitting, time delay and phase shift, and polarization interference in each basic structural unit; the demultiplexing device is inverted to serve as a multiplexing device; and the multiplexing device and the demultiplexing device realize operational function of inverse Fourier transform and Fourier transform on data sequence information carried in the optical signal. The device realizes the operational function of the inverse Fourier transform and the Fourier transform needed by OFDM signal multiplexing and demultiplexing in a full-light mode, and effectively eliminates the electronic processing speed limitation. Compared with devices in other full-light OFDM modes, the device has high expansibility, easily multiplexes and demultiplexes sub-channel signals with a large number of optical carriers, and has adjustable function and high flexibility.

Description

technical field [0001] The invention belongs to a signal processing device in an optical communication system, and specifically relates to an optical device based on polarization interference, which completes fast Fourier transform (FFT) and inverse transform (IFFT) in an all-optical form, and realizes orthogonal frequency division multiplexing Multiplexing and demultiplexing of (OFDM) signals. Background technique [0002] With the popularization of high-speed Internet and the rapid development of various communication services, the global information transmission volume is growing explosively, which puts forward higher requirements for the transmission performance of optical communication networks. The research and application of advanced optical modulation technology is very important to realize the transmission of ultra-large capacity and ultra-long-distance optical signals. [0003] OFDM is a multi-carrier multiplexing technology. By performing serial-to-parallel conve...

Claims

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Application Information

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IPC IPC(8): G02B27/28G02B6/293H04L27/26
Inventor 柯昌剑朱晓红刘德明潘登
Owner HUAZHONG UNIV OF SCI & TECH
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