Apparatus and method for monitoring statistical characteristics of phase noises, and coherent optical communication receiver

A technology of statistical characteristics and phase noise, which is applied in communication-related fields and can solve problems such as the inability to obtain statistical characteristics of phase noise in real time

Active Publication Date: 2011-06-15
FUJITSU LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of the above monitoring techniques can obtain the statistical characteristics of the phase noise caused by XPM in real time

Method used

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  • Apparatus and method for monitoring statistical characteristics of phase noises, and coherent optical communication receiver
  • Apparatus and method for monitoring statistical characteristics of phase noises, and coherent optical communication receiver
  • Apparatus and method for monitoring statistical characteristics of phase noises, and coherent optical communication receiver

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Embodiment Construction

[0048]Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. In the description of these embodiments of the present invention, the device and method for monitoring statistical characteristics of phase noise of the present invention are applied to digital coherent receivers. But this is not limiting, the device and method for monitoring statistical characteristics of phase noise of the present invention can also be applied to other systems, such as an online performance evaluation system in an optical communication link.

[0049] When applied to a digital coherent receiver, the present invention uses digital signal processing to obtain the statistical characteristics of phase noise caused by cross-phase modulation, that is, the autocorrelation sequence of phase noise, from received signal samples.

[0050] figure 1 The position of a typical digital optical coherent communication receiver and XPM autocorrelation char...

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Abstract

This invention relates to an apparatus and a method for monitoring statistical characteristics of phase noises, as well as to a coherent optical communication receiver. The apparatus for monitoring statistical characteristics of phase noises comprises an argument calculating unit (203), for obtaining an argument of a signal input thereto; an unwrapping unit (204), for unwrapping the argument obtained by the argument calculating unit (203) to obtain a phase signal (205); a delaying unit (207), for delaying the phase signal; a differentiating unit (209), for obtaining a difference between a phase 10 signal currently obtained by the unwrapping unit (204) and a phase signal delayed by the delaying unit (207); a modulus squaring unit (210), for obtaining a square of the modulus of the difference; and an averaging unit (211), for averaging squares of moduli of a plurality of differences obtained by the modulus squaring unit (210) to obtain a mean-squared differential phase 15 (MSDP) value.

Description

technical field [0001] The present invention is related to communication, more precisely, to estimation of phase noise of wavelength division multiplexed optical communication systems. Background technique [0002] Cross-Phase Modulation (Cross-Phase Modulation, XPM) means that the phase of a signal in one channel is modulated by the fluctuation of the light intensity of another channel. It originates from the fact that the refractive index of the fiber medium changes with the intensity of the light field. In the wavelength division multiplexing optical communication system, due to the existence of a large number of channels, the intensity of the optical field in the fiber medium fluctuates randomly, thus imposing phase noise on any channel. This phase noise due to cross-phase modulation is one of the main sources of system penalty. Because the phase change of a certain channel caused by cross-phase modulation is random, its characteristics are often represented by statist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02
CPCH04B10/6163H04J14/02H04B10/60H04B10/611H04B10/65
Inventor 严伟振陶振宁小田祥一朗
Owner FUJITSU LTD
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