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Single-sideband modulated single carrier frequency-domain equalization technology-based fiber communication system

An optical fiber communication system, single-carrier frequency domain technology, applied in the field of signal equalization processing, can solve problems such as poor optical fiber communication system effect, and achieve the effects of simple signal generation, good self-adaptation, and good transmission performance

Inactive Publication Date: 2010-04-07
FUDAN UNIV
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  • Application Information

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Problems solved by technology

For double-sideband signals, there will be a square rate folding effect in direct detection, and the received signal will alias the different dispersion effects of the upper and lower sidebands. Therefore, the frequency domain equalization scheme is not effective for double-sideband optical fiber communication systems. good

Method used

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  • Single-sideband modulated single carrier frequency-domain equalization technology-based fiber communication system
  • Single-sideband modulated single carrier frequency-domain equalization technology-based fiber communication system
  • Single-sideband modulated single carrier frequency-domain equalization technology-based fiber communication system

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Embodiment Construction

[0040] In the following, this solution will be fully implemented according to the single-carrier frequency domain equalization technology based on single sideband modulation proposed by this solution. At the same time, in order to reflect the equalization effect of this scheme, it is compared with the general double-sideband transmission system with the same transmission conditions.

[0041] Figure 4 System structure diagram for comparison of transmission performance: compare the traditional double sideband transmission system with the transmission system based on single sideband modulation single carrier frequency domain equalization technology. The upper part is a single-sideband frequency domain equalization system, which uses a unilaterally modulated transmitter, and uses direct reception when receiving; the second half uses double-sided Direct reception is also used.

[0042] The laser light source is a continuous light source generated by a DFB laser with a center fre...

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Abstract

The invention belongs to the technical field of fiber communication and optical network transmission signal equalization treatment, and particularly discloses a single-sideband modulated single carrier frequency-domain equalization technology-based fiber communication system. In a transmission system of fiber communication, by using a DSP equal high-speed digital signal processing mode, single-sideband modulated electrical signals received by direct detection are transformed to a frequency domain from a time domain by adopting FFT transformation, an equalization module designed aiming at a transmission link is adopted for performing equalization compensation in the frequency domain, and finally the signals processed by the equalization module are transformed to the time domain from the frequency domain through IFFT to acquire the final equalization signal. The fiber communication system can improve the transmission quality of the signals, and has the signal equalization compensation capacity of the self-adaptive fiber transmission link.

Description

technical field [0001] The invention belongs to the technical field of signal equalization processing for optical fiber communication and optical network transmission, and specifically relates to an optical fiber communication system based on single-sideband modulation and single-carrier frequency-domain equalization. Background technique [0002] There are two more and more obvious trends in the development of today's optical network: (i) the transmission rate of a single transmission channel is increasing rapidly, and is rapidly approaching 100Gb / s; (ii) due to the The use of optical networks that enable dynamic reconfiguration has gradually become a reality. These trends pose major challenges to the transmission links of optical networks. In particular, when the transmission network becomes more flexible, the traditional precise optical dispersion compensation (Optical Dispersion Compensation, ODC) will become too expensive and time-consuming, because the dispersion comp...

Claims

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Application Information

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IPC IPC(8): H04B10/18H04B10/12H04B10/2507
Inventor 张俊文迟楠
Owner FUDAN UNIV
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