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 problems such as being unfavorable to saving costs, not meeting green communication, and being unable to meet the increasing requirements of communication bandwidth, etc. Spectrum utilization, wide application range, cost-saving effect

Active Publication Date: 2016-05-25
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is neither conducive to cost saving, nor in line with the trend of green communication, nor can it meet the public's increasing requirements for communication bandwidth

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 Machzhede (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 gratings; the mode division multiplexing and demultiplexing unit includes first and second mode multiplexers connected by a few-mode optical fiber; the coherent receiving unit includes a local oscillator light source (Using single-wavelength laser), PBS, optical mixer, balanced detector and analog-to-digital converter. Different mode fields in few-mode fibers have different refractive indices. The few-mode fiber in this embodiment uses a two-mode fiber.

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

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 uses a single-wavelength laser, eliminating the need for wavelength division multiplexing and demultiplexing units.

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

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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] This application relates to the technical field of optical fiber communication, and 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 measure of communication capacity, and the transmission distance has also been a huge leap with the successful commercial application of erbium-doped fiber amplifier EDFA. But under the light ring where the communication capacity records are refreshed, these potential problems are also hidden—non-linear suppression, single-fiber unidirectional transmission efficiency, transmission cost, etc. [0003] Single-fiber bidirectional transmission technology was proposed very early, but due to the influence of noise such as Rayleigh backscattering and the lag of bidirectional EDFA re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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