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Optical communication method and system

An optical communication and optical signal technology, applied in the field of optical communication methods and systems based on differential coding, can solve the problems of reducing spectrum utilization, complex digital signal processing process at the receiving end, increasing data redundancy, etc., to achieve enhanced anti-carrier the ability to interfere with each other, the effect of improving the effective rate and spectral efficiency, and improving the system performance

Inactive Publication Date: 2012-04-25
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] In the current research hotspot-optical OFDM system, because the OFDM signal obtained by the conventional modulation method has a high peak power ratio, the influence of fiber nonlinearity has become a problem that is difficult to solve.
For traditional PSK or QAM coded OFDM signals, training sequences and pilot subcarriers are generally used, or a radio frequency signal is inserted separately, and these known data are used for channel estimation, phase noise compensation, etc., which increases data redundancy. This reduces the spectrum utilization, and on the other hand, the digital signal processing process at the receiving end becomes complicated

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Embodiment Construction

[0045] Embodiments of the present invention will be described below with reference to the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] In order to enhance the ability to resist inter-carrier interference without reducing the spectrum utilization rate, the optical communication system according to the present invention uses differential coding technology at the sending end to encode the bit stream data to be sent, and converts the generated differential coding The signal is modulated onto the optical carrier and sent as an optical signal, and the received optical signal is decoded by using the corresponding differential decoding technology at the receiving end, so as to o...

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Abstract

The invention provides an optical communication method which comprises the steps of: modulating obtained bit stream data to obtain a modulating signal; carrying out differential coding on the modulating signal to obtain a differential coding signal; converting the differential coding signal into an electrical signal; mapping the electrical signal on an optical carrier to form an optical signal; and then transmitting the optical signal. By using the method, on the premise that a frequency spectrum utilization rate is not reduced, the system capability of resisting disturbance among carriers is enhanced; thus, the tolerance of the existing optical communication sysem for resisting laser linewidth, quick change PMD (Physical Media Dependent), nonlinear fiber, disturbance among channels and other damage is enhanced; and system performance is greatly enhanced.

Description

technical field [0001] The present invention relates to the technical field of optical fiber communication, and more specifically, to an optical communication method and system based on differential coding. Background technique [0002] In order to improve the spectrum utilization rate of the optical transmission system, a multi-carrier technology has been proposed. So far, it mainly includes the use of WDM, OFDM and the super channel proposed by Bell Labs in 2010. [0003] Among them, WDM is the English abbreviation of wavelength division multiplexing, and the carrier spacing is generally on the order of tens of GHz. OFDM is the English abbreviation of Orthogonal Frequency Division Multiplexing. It has been introduced into optical communication since wireless communication. At present, there are traditional OFDM and all-optical OFDM. The former loads OFDM signals generated in the electrical domain onto optical carriers, and the subcarrier spacing Therefore, it is very sma...

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Application Information

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IPC IPC(8): H04B10/12H04L25/02H04B10/516
Inventor 伍剑王慧李岩洪小斌郭宏翔左勇徐坤李蔚林金桐
Owner BEIJING UNIV OF POSTS & TELECOMM
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