A non-orthogonal polarization multiplexing phase modulation signal transmission method based on phase tracking

Abstract

The invention discloses a non-orthogonal polarization multiplexing phase modulation signal transmission scheme based on phase tracking. At the transmitting end, 1011-101N generate one or N non-orthogonal polarization multiplexing (NPDM) phase modulation (m‑PSK) signals of different wavelengths; the NPDM phase modulation signals are synthesized into wave The NPDM of division multiplexing; The optical signal after multiplexing enters in the optical fiber (103) and transmits; The optical signal after transmission is carried out power compensation by optical amplifier (104); ), to realize the demodulation output of the non-orthogonal phase modulation signal. Compared with the traditional orthogonal polarization multiplexing (PDM) phase modulation signal scheme, the non-orthogonal multiplexing phase modulation signal whose polarization multiplexing angle is larger than a specific small angle in the present invention can be adaptively recovered, and the polarization-dependent Loss has a greater tolerance and is suitable for the backbone network field of long-distance transmission. At the same time, the solution is also compatible with the traditional PDM solution, which greatly improves the flexibility of future backbone network transmission.

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 method 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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