Non-orthogonal polarization multiplexing phase modulation signal transmission plan based on phase tracking

Abstract

The invention discloses a non-orthogonal polarization multiplexing phase modulation signal transmission plan based on phase tracking. In a transmitting end with the serial number of 101<1> to 101<N>, one or N non-orthogonal polarization multiplexing (NPDM) phase modulation (m-PSK) signals with different wavelengths are generated; the NPDM phase modulation signals are combined into a wavelength division multiplexing NPDM signal via a wavelength division multiplexer (102); the multiplexed optical signal is transmitted in an optical fiber (103); an optical amplifier (104) is used for performing power compensation to the transmitted optical signal; an electrical signal received by a receiving end is used to realize demodulation output of non-orthogonal phase modulation signals in a digital signal processing unit (108). Compared with a traditional orthogonal polarization multiplexing (PDM) phase modulation signal plan, a non-orthogonal multiplexing phase modulation signal whose polarization multiplexing angle is greater than a certain specific small angle could be adaptively recovered in the invention, and the signal transmission plan has larger tolerance to polarization dependent loss and is suitable for the field of backbone networks for long-distance transmission. Simultaneously, the plan is compatible with the traditional PDM solution, thereby greatly improving the transmission flexibility of a future backbone network.

Description

technical field [0001] The invention relates to the backbone network field of long-distance transmission, in particular to a non-orthogonal polarization multiplexing phase modulation signal transmission scheme based on phase tracking. Background technique [0002] With the continuous development of today's information society, the general public's demand for information is increasing year by year. In the 30 years of development of the optical fiber communication industry, the system capacity and transmission distance have shown an increase of about ten times every four years. Under this requirement, the dense optical wavelength division multiplexing (DWDM) system currently deployed on a large scale is gradually exhausting its wavelength resources. Compressing optical pulses to improve the efficiency of time-division multiplexing (TDM) systems also has significant limitations. In this context, researchers in optical communication urgently need to find new technologies to im...

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Problems solved by technology

However, all the schemes only study the multiplexing schemes with polarization angles of 45° and 60°, and the longest transmission distance in experimental research is only 2km

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