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Self-correlation optical fiber communication system based on mode division multiplexing

An optical fiber communication system and wavelength division multiplexing technology, applied in optical fiber transmission, electromagnetic receivers and other directions, can solve practical problems, sacrifice spectral efficiency and other problems, achieve engineering cost saving, wide application range, good nonlinear tolerance Effect

Active Publication Date: 2013-05-08
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this system requires a polarization state to carry CW, which sacrifices spectral efficiency, and is limited by the nonlinear influence of single-mode fiber, so the practicability is greatly restricted

Method used

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  • Self-correlation optical fiber communication system based on mode division multiplexing
  • Self-correlation optical fiber communication system based on mode division multiplexing

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Embodiment 1

[0030] see figure 1 , in this embodiment, the optical carrier input unit includes a multi-wavelength laser array and a plurality of couplers; the wavelength division multiplexing unit includes a first arrayed waveguide grating and a second arrayed waveguide grating; the optical signal modulation unit includes an optical delay line, a polarization Separator (PBS), first Mach Zed (MZM) modulation module, second MZM modulation module and polarization coupler (PBC); mode division multiplexing and demultiplexing unit includes mode multiplexer, mode demultiplexer and Few-mode fiber; the wave division multiplexing unit includes a third array waveguide grating and a fourth array waveguide grating; the coherent receiving unit includes a PBS, an optical mixer, a balance detector and an analog-to-digital converter. Different mode fields in a few-mode fiber have different refractive indices. The few-mode fiber in this embodiment is a two-mode fiber.

[0031] Multiple optical carriers of d...

Embodiment 2

[0033] see figure 2 , the structure of this example is roughly the same as that of Embodiment 1, except that the multi-wavelength laser array in the optical carrier input unit becomes a single-wavelength laser, and the wavelength division multiplexing unit and the wavelength division multiplexing unit are omitted. The few-mode fiber in this embodiment is a two-mode fiber.

[0034] The working principle of a self-coherent optical fiber communication system based on mode division multiplexing provided in this embodiment is as follows: see figure 1 , when the light of a certain wavelength generated by the single-wavelength laser passes through the optical delay line, a part of the light is divided into two orthogonal paths through the PBS, and the two paths of light separated from the PBS pass through the first MZM modulation module and the second MZM respectively. The modulation module performs signal modulation. The modulated two-way optical signals are merged into the PBC t...

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Abstract

The invention discloses a self-correlation optical fiber communication system based on mode division multiplexing. The self-correlation optical fiber communication system based on mode division multiplexing comprises an optical carrier input unit, optical signal modulation units, a wavelength division multiplexing unit, a mode division multiplexing and demultiplexing unit, a wavelength division multiplexing unit and coherent reception units. The mode division multiplexing and reconciliation multiplexing unit comprises a mode multiplexer and mode demultiplexer, and the mode multiplexer and the mode demultiplexer are connected through few-mode optical fibers. The optical carrier input unit is connected with each optical signal modulation unit, the wavelength division multiplexing unit and the mode multiplexer through single-mode optical fibers. The mode multiplexer is connected with the mode demultiplexer through few-mode optical fibers. The mode demultiplexer is connected with the wavelength division multiplexing unit and each coherent reception unit through single-mode optical fibers. The optical carrier input unit is further connected with the wavelength division multiplexing unit. The self-correlation optical fiber communication system based on mode division multiplexing eliminates an expensive narrow line width adjustable local oscillator light source which is arranged at a reception end, enables a laser to be conveniently managed and maintained, is free from using frequency offset estimation in a digital signal processor (DSP) and phase retrieval algorithm, reduces complexity of the DSP and has the advantages of being high in spectrum effectiveness and big in nonlinearity tolerance.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a self-coherent optical fiber communication system based on mode division multiplexing. Background technique [0002] Modern communication methods such as multimedia services have put forward higher requirements for communication capacity, and have greatly promoted the development of the communication industry. The advent and commercial application of ear-doped fiber amplifier (EDFA) has greatly promoted the development of optical fiber communication and extended the transmission distance without repeaters. With the improvement of communication capacity, factors such as chromatic dispersion, polarization mode dispersion, nonlinear effects, and phase noise in optical fiber links greatly limit the transmission distance without repeaters and practical network applications. In order to further improve transmission capacity and transmission distance, the tradition...

Claims

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Application Information

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IPC IPC(8): H04B10/25H04B10/61
Inventor 付松年渠振张敏明唐明沈平刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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