Light signal modulation method, transmission method and system in wavelnth division mulplexing light transmission system

A modulation method and transmission system technology, applied in wavelength division multiplexing systems, electromagnetic wave transmission systems, transmission systems, etc., can solve the problems of limiting transmission distance, nonlinear effect accumulation, etc., and achieve nonlinear effect suppression and stimulated distribution suppression The effect of Rieouin scattering

Inactive Publication Date: 2003-11-26
HUAWEI TECH CO LTD
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  • Application Information

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Problems solved by technology

An effective way to improve the optical signal-to-noise ratio and reduce the bit error rate in the optical fiber is to increase the power of the light wave, but the increase of the power will cause the accumulation of nonlinear effects, which limits the extension of the transmission distance

Method used

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  • Light signal modulation method, transmission method and system in wavelnth division mulplexing light transmission system
  • Light signal modulation method, transmission method and system in wavelnth division mulplexing light transmission system
  • Light signal modulation method, transmission method and system in wavelnth division mulplexing light transmission system

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Embodiment Construction

[0030] see figure 1 As shown, the optical signal modulation method of the present invention adopts that the return-to-zero code (RZ) / non-return-to-zero code (NRZ) optical signal emitted by the light intensity pulse generator in the optical transmission module is first phase-modulated with a phase modulator, and then used The clock signal driver drives the optical signal after phase modulation, and finally outputs the chirped pulse optical signal.

[0031] When the optical signal is driven and modulated, the change process of the drive signal is driven by a positive clock that changes from low to high, or the change process of the drive signal is driven by a reverse clock that changes from high to low.

[0032] As one of the ways of positive clock signal driving and reverse clock signal driving, positive and negative levels are used for driving in the present invention. That is, the positive clock driving modulation adopts positive level pulse driving modulation; the reverse c...

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Abstract

This invention discloses an optical signal modulation method, light transmitting method and its system in WDM light transmission system. The method is that multiroute chirp pulse light signals to be transmitted are combined, then to be transmitted by transmission fiber to be treated by dispersion compensation and optical amplification, further to be processed by splitting, and then to be received. This invention can allocate the radio relay transmission distance of tightly spaced WDM system of 10 Gbit/s and 100G intervals with the same link to increase the distances from original 400km to over 3000km and increase the transmission distances of 40Gbit/s and 100G intervals from 200km to above 1600 km.

Description

technical field [0001] The present invention relates to optical signal transmission, and more specifically refers to an optical signal modulation method, a transmission method and a system in a wavelength division multiplexing optical transmission system. Background technique [0002] Non-return-to-zero code NRZ (NRZ: Non-Return-To-Zero) and return-to-zero code RZ (RZ: Return-To-Zero) are two basic code modulation forms of optical signal pulses in digital optical transmission systems. They have Mature technology, wide application, low cost, etc., but due to the impact of noise and nonlinear effects on the quality of transmitted optical signals, in order to ensure that the bit error characteristics meet the requirements, power regeneration must be performed every 500-600km of transmission to reduce the distance between amplifiers and relays It can slow down the deterioration of the signal-to-noise ratio of the system and extend the transmission distance without electrical rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01H04B10/524H04B10/548H04J14/02
Inventor 李长春刘玥
Owner HUAWEI TECH CO LTD
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