Device and method for restraining in-band white noise in high-speed optical fiber communication system
A technology of optical fiber communication system and suppression device, applied in the direction of optical fiber transmission, elimination of distortion/chromatic dispersion, etc., to achieve the effect of reducing power consumption, reducing bit error rate, and large application potential
Active Publication Date: 2015-05-27
WUHAN POST & TELECOMM RES INST CO LTD
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[0004] The technical problem to be solved by the present invention is to partially eliminate the in-band white noise in the high-speed optical fiber communication system
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[0013] The principle of the invention is based on the fractional Fourier transform, and performs in-band white noise suppression at the receiving end of the high-speed optical fiber communication system. Fractional Fourier Transform (FFT) has great application value in in-band white noise suppression due to its unique transformation characteristics. V.Namias gave an improved form of Fourier transform in 1980, that is, fractional Fourier transform (also known as fractional Fourier transform). In 1993, Mondlovic et al. first introduced fractional Fourier transform into optical research, and Mendlovic et al. proposed to use square refractive index optical waveguide to realize fractional Fourier transform. In the same year, Lohmann et al. used Fourier transform and Wigner distribution function in the phase space The property that the rotation at an angle of 0.5π is equivalent explains the physical meaning of the fractional Fourier transform, and proposes to realize the fractional ...
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The invention discloses a device and a method for restraining in-band white noise in a high-speed optical fiber communication system. The device is provided with a clock signal generator, a waveform generator, a full-optical fractional order Fourier transform device, an optical switch and a full-optical fractional order inverse Fourier transform device at a receiving end of the optical fiber communication system; the clock signal generator restores a clock signal from an input signal, and outputs a first driving signal and a second driving signal with opposite phases through the waveform generator; the full-optical fractional order Fourier transform device carries out full-optical fractional order Fourier transform on the input signal according to the first driving signal and intercepts the in-band white noise of the removed part by the optical switch, and then the full-optical fractional order inverse Fourier transform device finishes the full-optical fractional order inverse Fourier transform according to the second driving signal and restores the input signal. The device disclosed by the invention carries out the in-band white noise restraining based on full-optical fractional order Fourier transform on the signal of the receiving end, so that an error rate of the input signal is obviously reduced.
Description
technical field [0001] The invention relates to noise suppression in a high-speed optical fiber communication system, in particular to a suppression device and method for in-band white noise in a high-speed optical fiber communication system. Background technique [0002] At present, optical fiber communication has become a basic part of modern communication networks. With the rapid rise of the Internet, especially the explosive growth of voice, image and data services, the demand for optical fiber communication capacity is increasing. [0003] In order to fully exploit the bandwidth capability of optical fiber, wavelength division multiplexing (WDM) and erbium-doped fiber amplifier (EDFA) are commonly used. Due to the extensive use of erbium-doped fiber amplifiers, it will lead to an increase in optical white noise. Each additional EDFA will reduce the signal-to-noise ratio by at least 3dB, thereby introducing more white noise, especially in long-distance large-capacity tra...
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Inventor 李蔚范佑文余少华刘子晨邱英
Owner WUHAN POST & TELECOMM RES INST CO LTD