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Few-mode optical fiber transmission system and digital signal recovery method thereof

A technology of few-mode optical fiber and transmission system, which is applied in the field of channel equalization of few-mode optical fiber orthogonal frequency division multiplexing system

Active Publication Date: 2016-05-04
WUHAN POST & TELECOMM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the technical problem solved by the present invention is: reduce the complexity of the sending end of the system and improve the spectral efficiency of the system

Method used

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  • Few-mode optical fiber transmission system and digital signal recovery method thereof
  • Few-mode optical fiber transmission system and digital signal recovery method thereof
  • Few-mode optical fiber transmission system and digital signal recovery method thereof

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0036] The few-mode optical fiber transmission system in the embodiment of the present invention includes a sending end and a receiving end. The transmitting end adopts the OFDM modulation method and sends an independent OFDM signal in each mode; the receiving end adopts the coherent detection method, and a coherent receiver is used for each independent mode.

[0037] see figure 2 As shown, the transmitting end uses an IQ modulator to modulate the electrical OFDM signal onto the light, specifically including a transmitting laser, an optical splitter, a mode coupler, and at least two polarization multiplexing IQ modulators, each polarization multiplexing IQ modulator Configured with 2 OFDM generators. The transmitting laser is respectively connected to each polarization multiplexing IQ modulator through an optical splitter, and each polariza...

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Abstract

The invention discloses a few-mode optical fiber transmission system and a digital signal recovery method thereof, and relates to the channel balancing field of a few-mode optical fiber orthogonal frequency division multiplexing system. Each polarization multiplexing IQ modulator on a sending end of the system is provided with two OFDM generators; a sending laser is connected with each polarization multiplexing IQ modulator through a light splitter, and each polarization multiplexing IQ modulator is respectively connected with a mode coupler. A receiving laser and a mode beam splitter on a receiving end is respectively connected each polarization coherent receiver; and an ADC assembly of each polarization coherent receiver is connected with a digital signal processing chip. According to the invention, the complexity degree of the sending end of the system is lowered, the frequency spectrum efficiency of the system is improved, the frequency spectrum efficiency of the system is obviously improved under the condition that signal performance is not lost, and the recovery of OFDM signals in few-mode optical fiber transmission is realized by relatively few training sequences, and the training sequences do not need special design.

Description

technical field [0001] The invention relates to the channel equalization field of a few-mode optical fiber orthogonal frequency division multiplexing system, in particular to a few-mode optical fiber transmission system and a digital signal recovery method thereof. Background technique [0002] The current few-mode optical fiber communication system is generally based on a single-carrier modulation format. In the few-mode optical fiber communication system, a very long training sequence will be used for channel estimation; and the channel is simulated as a finite impulse response filter in the time domain. The number of taps is more. Compared with the single-carrier modulation format, the channel equalization method of the OFDM (Orthogonal Frequency Division Multiplexing) modulation format is relatively simple, and only needs to use a filter with a small number of taps; in the traditional few-mode fiber OFDM system, the channel restoration The required number of taps is N, ...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L27/01
CPCH04B7/0684H04L27/01
Inventor 李响
Owner WUHAN POST & TELECOMM RES INST CO LTD