Single-fiber bidirectional transmission system based on mode division multiplexing

A mode-division multiplexing, single-fiber bidirectional technology, used in optical fiber transmission, eliminating distortion/dispersion, etc., can solve the problems of not meeting the increasing requirements of communication bandwidth, not conducive to saving costs, and not conforming to green communication, etc. The effect of spectrum utilization, wide application range and engineering cost saving

Active Publication Date: 2013-06-12
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

This is neither conducive to cost saving, nor in line with the trend of green communic

Method used

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  • Single-fiber bidirectional transmission system based on mode division multiplexing
  • Single-fiber bidirectional transmission system based on mode division multiplexing
  • Single-fiber bidirectional transmission system based on mode division multiplexing

Examples

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Embodiment 1

[0032] see figure 2 , in this embodiment, the optical carrier input unit is a multi-wavelength laser array; the optical signal modulation unit includes a polarization splitter (PBS), a first Mach-Zed (MZM) modulation module, a second MZM modulation module and a polarization coupler (PBC ); the wavelength division multiplexing unit and the wavelength division multiplexing unit adopt arrayed waveguide grating; the mode division multiplexing and demultiplexing unit includes first and second mode multiplexers connected by few-mode optical fiber; the coherent receiving unit includes a local oscillator light source (using a single wavelength laser), PBS, optical mixer, balanced detector and 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.

[0033] The optical carriers of each wavelength output by the multi-wavelength laser array are sequentially connected to the mod...

Embodiment 2

[0036] see image 3 , the structure of this example is roughly the same as that of Embodiment 1, except that the optical carrier input unit adopts a single-wavelength laser, and the wavelength division multiplexing and demultiplexing units are omitted.

[0037] The working principle of a single-fiber bidirectional transmission system based on mode division multiplexing provided in this embodiment is as follows: see image 3 , in view of the symmetry of transmission, analyzed from west to east, a part of the light of a certain wavelength generated by the single-wavelength laser passes through the PBS and is divided into two orthogonal paths, and the two paths of light split from the PBS pass through the first MZM modulator respectively Perform signal modulation with the second MZM modulator. The modulated two-way optical signals are merged into the PBC for polarization multiplexing, and then injected into the single-mode optical fiber to transmit the optical signals to the mod...

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Abstract

The invention discloses a single-fiber bidirectional transmission system based on mode division multiplexing. The single-fiber bidirectional transmission system based on the division multiplexing mainly comprises two optical signal input units, two optical signal output units and a mode division multiplexing and demultiplexing unit, wherein the mode division multiplexing and demultiplexing unit comprises two mode-type multiplexers which are connected through few-mode fiber. Polarization multiplexing optical signals are generated by the signal input units, the polarization multiplexing optical signals are enabled to be coupled into a mode field of the few-mode fiber by the mode-type multiplexer to finish the mode division multiplexing, the polarization multiplexing optical signals carried by the mode field are sent to the other mode-type multiplexer through the few-mode fiber, the received polarization multiplexing optical signals are enabled to be coupled into single-mode fiber by the other mode-type multiplexer and sent to the optical signal output units through the single-mode fiber, polarization diversity, mixing and balance detection are carried out on the received optical signals by the signal output units, then the received optical signals are changed into electric signals and then changed into digital signals. According to the single-fiber bidirectional transmission system based on the mode division multiplexing, the few-mode fiber is used for overcoming Rayleigh backward scattering effect, single-fiber bidirectional transmission is achieved, and use efficiency of optical fiber and wavelength resources is improved.

Description

technical field [0001] The present application relates to the technical field of optical fiber communication, in particular to a single-fiber bidirectional transmission system based on mode division multiplexing. Background technique [0002] With the increase in demand for video conferencing, people's requirements for optical fiber communication bandwidth are also increasing. Spectrum efficiency is an important criterion for measuring communication capacity, and the transmission distance has also achieved a huge leap along with the successful commercial application of Erbium-doped fiber amplifier EDFA. However, under the halo of the communication capacity records being refreshed one after another, some potential problems are also hidden-non-linear suppression, efficiency of single-fiber one-way transmission, transmission cost, etc. [0003] Single-fiber bidirectional transmission technology has been proposed very early, but due to the influence of noise such as Rayleigh ba...

Claims

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Application Information

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IPC IPC(8): H04B10/25H04B10/2507
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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