Optical signal transmission processing method, sending device and system

Abstract

The embodiment of the invention relates to the field of communication transmission, and discloses an optical signal transmission processing method, an optical signal sending device and an optical signal transmission system. The optical signal sending device comprises a sending end optical signal generating device, a first polarization controller, a second polarized controller, a first quarternaryphase-shift keying modulator, a second quarternary phase-shift keying modulator and a polarization beam combiner, wherein the sending end optical signal generating device is used for generating an optical signal A and an optical signal B with different wavelengths; the first polarization controller is used for carrying out polarization control for the optical signal A and generating an X polarization optical signal A; the second polarized controller is used for carrying out polarization control for the optical signal B and generating a Y polarization optical signal B; the first quarternary phase-shift keying modulator is used for modulating the X polarization optical signal A; the second quarternary phase-shift keying modulator is used for modulating the Y polarization optical signal B; and the polarization beam combiner is used for combining the modulated X polarization optical signal A and the modulated Y polarization optical signal B into a dual-carrier single-polarization optical signal. The invention enables the nonlinear effect in an optical fiber to be inhabited, enhances the nonlinear tolerance limit and the fiber feeding power of the optical signal transmission system andextends the transmission distance.

Description

technical field [0001] The present invention relates to the field of communication transmission, in particular to an optical signal transmission processing method, sending device and system. Background technique [0002] With the increase of single-wavelength transmission rate, the damage of optical signal in the transmission fiber has become a key issue in high-speed optical transmission system. Coherent reception can linearly convert the damage in the optical domain to the electrical domain, and use the electrical domain to process and compensate the dispersion and polarization of the line. Mode dispersion PMD damage is an important technical means in the current high-speed transmission processing, but the disadvantage of this processing method is that it is limited by nonlinear effects. [0003] like figure 1 As shown, the processing method in the prior art is to perform four phase shifts in the X polarization direction and Y polarization direction of the single-waveleng...

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Problems solved by technology

[0004] From the above-mentioned introduction to the optical transmission system of the prior art, the inventor found that the above-mentioned prior art has at least the following problems: the existing optical transmission system is affected by nonlinearity, and when the input power of the optical signal increases, the nonlinear effect leading to an inability to correctly recover the phase of the carrier

The method of reducing the power of the optical signal into the fiber is usually used to reduce the nonlinear effect of the system, but this will reduce the Optical Signal Noise Ratio (OSNR) of the optical transmission system and limit the distance of optical transmission.

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