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High-speed WDM (Wavelength Division Multiplexing) light communication system and method for resisting non-linearity effect in same

An optical communication system and nonlinear effect technology, applied in the field of optical communication systems, can solve problems such as unsatisfactory and limited effect, and achieve better effect and lower requirements.

Active Publication Date: 2010-08-04
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

The effect of the existing methods of suppressing iFWM in practical applications is limited by actual conditions and is unsatisfactory. A better method of suppressing iFWM is needed

Method used

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  • High-speed WDM (Wavelength Division Multiplexing) light communication system and method for resisting non-linearity effect in same
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  • High-speed WDM (Wavelength Division Multiplexing) light communication system and method for resisting non-linearity effect in same

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Embodiment Construction

[0032] The performance of optical communication systems will be limited by nonlinear effects, especially for high-speed WDM optical communication systems, where the most influential nonlinear effect is the iFWM effect, and effective measures need to be taken to suppress it. The invention provides a method for suppressing nonlinear effects in a high-speed WDM optical communication system, which can effectively suppress the iFWM effect of an optical fiber link and improve its transmission capacity.

[0033] The method for suppressing nonlinear effects in a high-speed WDM optical communication system comprises the following steps:

[0034] A10. At the transmitting end of the optical communication system, the linearly polarized light of different wavelengths emitted by the laser is respectively generated into two paths of polarized light in the first polarization direction and polarized light in the second polarization direction with orthogonal polarization states;

[0035] A20. T...

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Abstract

The invention discloses a high-speed WDM (Wavelength Division Multiplexing) light communication system and a method for resisting non-linearity effect in the same. The method comprises the following steps of: (A10) respectively dividing linearly polarized light into polarized light in a first polarization direction and polarized light in a second polarization direction, wherein the two paths of polarized light have orthogonal polarization states; (A20) coding and modulating digital signals by adopting polarization interleaved codes, i.e. respectively modulating code 1 of the same group of the digital signals to the polarized light in the first polarization direction and the polarized light in the second polarization direction; (A30) merging the polarized light in the first polarization direction and the polarized light in the second polarization direction into a transmission light wave, multiplexing by a wavelength division multiplexer at a transmitting terminal and outputting to an optical fiber link; and (A40) dividing the transmission light wave by a wavelength division demultiplexer at a receiving terminal and respectively outputting to a light-strength detecting light receiver. The invention damages the forming conditions of iFWM (intra-channel Four-Wave Mixing) by utilizing the polarization characteristics of the light wave. Compared with the traditional method, the invention lowers the requirements for the linear width of a laser and the performance of a modulator so that the actual iFWM-resisting effect is better.

Description

technical field [0001] The invention relates to an optical communication system, in particular to a high-speed WDM optical communication system and a method for suppressing nonlinear effects in the system. Background technique [0002] The meanings of technical terms used in the present invention are as follows: [0003] WDM, WavelengthDivisionMultiplexing, wavelength division multiplexing; [0004] iFWM, Intra-channelFourWaveMixing, four-wave mixing in the channel; [0005] PolSK, PolarizationShiftKeying, polarization shift keying; [0006] iXPM, Intra-channelCross-PhaseModulation, intra-channel cross-phase modulation; [0007] SPM, Self-PhaseModulation, cross-phase modulation; [0008] CSRZ, CarrierSuppressionReturnZero, carrier suppression return to zero code; [0009] AMI, AlternativeMarkInversion, mark alternate inversion code. [0010] In order to meet the increasing demand for network bandwidth, WDM optical fiber communication systems are widely used. The exist...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/12H04J14/02H04B10/2543
Inventor 张新全杨铸谢德权杨超
Owner WUHAN POST & TELECOMM RES INST CO LTD
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