4 results about "Residual dispersion" patented technology

The application belongs to the technical field of optical fiber communication, and discloses an optical fiber transmission link quality monitoring and dispersion compensation optimization method and system, which comprises the following steps: extracting an error vector amplitude, an optical signal-to-noise ratio and constellation distortion features from a coherent receiver and fusing them into a comprehensive quality evaluation index; jointly estimating residual dispersion by using a clock recovery phase and equalizer coefficient distribution; adopting a variable step gradient descent to adaptively optimize dispersion compensation filter parameters; performing performance degradation trend analysis and early warning; and jointly monitoring and cooperatively optimizing multiple wavelength channels.

The invention belongs to the technical field of optical fiber communication, and discloses an optical fiber transmission link quality monitoring and dispersion compensation optimization method and system, and the method comprises the steps: extracting an error vector amplitude, an optical signal-to-noise ratio and a constellation diagram distortion feature from a coherent receiver, and fusing the features into a comprehensive quality evaluation index; according to the method, residual dispersion is jointly estimated by using clock recovery phase and equalizer coefficient distribution, parameters of a dispersion compensation filter are adaptively optimized by adopting variable step gradient descent, and performance degradation trend analysis and early warning and multi-wavelength channel joint monitoring and collaborative optimization are carried out.

The invention relates to the technical field of optical signal processing, in particular to a real-time carrier recovery method and system. According to the invention, the FFT scheme is used to estimate the frequency offset, and the anti-interference capability of the system to the residual dispersion is improved. And aiming at the problem of high hardware overhead of the traditional complex number quadruple operation, quadruple amplification of the phase is equivalently realized by adopting absolute value operation, and about 70% of LUT resource overhead is saved. And the compensation phase angle output by the frequency offset estimation module is directly compensated in the polar coordinate system, so that compensation in a Cartesian coordinate system is avoided, and about 80% of LUT resource overhead is saved.

An optical power distribution estimation device includes: a partial wavelength dispersion application unit that applies, to a signal, partial wavelength dispersion corresponding to a distance from an optical transmission device to an optical power measurement position; a nonlinear operation unit that performs, on the signal to which the partial wavelength dispersion has been applied, nonlinear operation using a linear term obtained by Taylor-expanding a mathematical expression used for phase rotation; a residual dispersion application unit that applies residual wavelength dispersion corresponding to a distance from the optical power measurement position to an optical reception device to the signal subjected to the nonlinear operation by the nonlinear operation unit; and a correlation calculation unit that estimates an optical power distribution of an optical transmission line by obtaining, for each optical power measurement position, a correlation between the signal to which the residual wavelength dispersion has been applied and a reception signal based on an optical signal transmitted from the optical transmission device and received via the optical transmission line.