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Light transmission system and method for reducing fiber non-linearity effects

A nonlinear effect, optical transmission technology, applied in the field of optical communication, can solve the problems of insignificant performance improvement, complex control, large power consumption and delay, etc., to improve transmission performance and transmission distance, avoid complex control, and reduce costs. Effect

Active Publication Date: 2016-10-26
FENGHUO COMM SCI & TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, optical phase conjugation requires the use of sophisticated optical conjugation devices and complex control algorithms, which are costly and complex to control, and due to the asymmetrical transmission characteristics of the front and rear links, the performance improvement is not significant; while digital The iterative process of the backpropagation method is very complicated, and the power consumption and delay are relatively large

Method used

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  • Light transmission system and method for reducing fiber non-linearity effects
  • Light transmission system and method for reducing fiber non-linearity effects
  • Light transmission system and method for reducing fiber non-linearity effects

Examples

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no. 1 example

[0022] In this embodiment, the optical transmission system for reducing the nonlinear effect of optical fibers includes a single-carrier transmitter and a single-carrier receiver.

[0023] like figure 2 As shown, the single-carrier transmitter includes a 3dB 1×2 optical splitter (1*2SP), two intensity modulators (AM 0 and AM 1 ), two phase modulators (PM 0 and PM 1 ) and a 2×1 optical switch (2*1SW). Among them, the 1×2 optical demultiplexer is used to divide the continuous optical signal emitted by the sub-carrier light source λ into two equal paths, and each path is equipped with an intensity modulator and a phase modulator, such as figure 2 One of the roads set AM 0 and PM 0 , another way to set AM 1 and PM 1 , the intensity modulator is used to modulate the amplitude of the optical signal, the phase modulator is used to modulate the phase of the optical signal, the center frequency of the two modulated optical signals is the same, the intensity ratio α is constan...

no. 2 example

[0032] In this embodiment, the optical transmission system for reducing nonlinear effects of optical fibers includes a multi-carrier transmitter and a multi-carrier receiver.

[0033] like Figure 4 As shown, the multi-carrier transmitter can transmit N (N is a natural number > 1) parallel sub-carrier optical signals, including multiple single-carrier transmitters. Each single-carrier transmitter includes a 3dB 1×2 optical splitter (1*2SP), which is used to receive one of the N parallel sub-carrier optical signals, and divide the received optical signal into two paths, each An intensity modulator (AM 0 N and AM 1 N ) and a phase modulator (PM 0 N and PM 1 N ), the intensity modulator is used to modulate the amplitude of the optical signal, and the phase modulator is used to modulate the phase of the optical signal. The center frequency of the two modulated optical signals is the same, the intensity ratio is constant, and the phase is opposite; the single carrier transm...

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Abstract

The invention discloses a light transmission system and method for reducing fiber non-linearity effects, and relates to the field of fiber communication. The system includes a single carrier transmitter and a single carrier receiver. The single carrier transmitter divides a continuous light signal transmitted by a subcarrier light source into two equal paths with each path provided with one intensity modulator and one phase modulator. The two paths of light signals after the modulation have the same center frequencies, constant intensity ratio, and opposite phases. A light switch is intended for switching the two paths of light signals. The single carrier receiver is intended for receiving the light signals in the two paths. Each path of optical mixer conducts frequency mixing on the corresponding path of light signal and one continuous narrow band reference light signal having the same center frequency and is orthogonal, conducts light / electrical conversion on the light signals after frequency mixing, converts an analog signal to a digital electrical signal. A digital electrical signal processor is intended for processing the two paths of digital electrical signals, and extracts loaded data. According to the invention, the system reduces influence of fiber non-linearity effects, reduces complexity of cost and controlling, and reduces power consumption and time delay.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to an optical transmission system and method for reducing the nonlinear effect of an optical fiber. Background technique [0002] With the sharp increase in the demand for network transmission capacity, the single-channel transmission rate of the optical transmission system has experienced an increase from 2.5Gbit / s→10Gbit / s→40Gbit / s→100Gbit / s, and the next generation of super 100G optical transmission system is brewing . The key to further increasing the transmission capacity of a single optical fiber in ultra-100Gbit / s optical transmission is to improve the utilization rate and spectrum efficiency of spectrum resources while the available frequency band resources remain unchanged. However, due to the limitation of the nonlinear effect of optical fiber, the contradiction between optical transmission distance and spectral efficiency beyond 100G is very significant. Choose a mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2543
CPCH04B10/2543
Inventor 冯勇华徐俊波魏学勤
Owner FENGHUO COMM SCI & TECH CO LTD
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