Method and system for transmitting and receiving by orthogonally dual-polarized differential quaternary phase shift keying

A phase-shift keying and differential four-phase technology, which is applied in phase-modulated carrier systems and other directions, can solve the problem that Mach-Zehnder modulators are difficult to be symmetrical, π/8 phase shifters are difficult to achieve accurate stability, and components are stable sex issues

A phase-shift keying and differential four-phase technology, which is applied in phase-modulated carrier systems and other directions, can solve the problem that Mach-Zehnder modulators are difficult to be symmetrical, π/8 phase shifters are difficult to achieve accurate stability, and components are stable sex issues

CN101895495AInactive Publication Date: 2010-11-24BEIJING UNIV OF POSTS & TELECOMM
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  • Method and system for transmitting and receiving by orthogonally dual-polarized differential quaternary phase shift keying
  • Method and system for transmitting and receiving by orthogonally dual-polarized differential quaternary phase shift keying
  • Method and system for transmitting and receiving by orthogonally dual-polarized differential quaternary phase shift keying

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Embodiment Construction

[0043] Such asfigure 1 As shown, the continuous light output by the continuous laser of the transmitting device of the present invention is used as an optical carrier, and is input to the upper and lower DQPSK modulators through the polarization beam splitter to be modulated; the function of the polarization beam splitter is to divide the incident continuous light into polarization Two beams of linearly polarized light that are perpendicular to each other; each DQPSK modulator is composed of two upper and lower Mach-Zehnder modulators and a π / 2 phase shifter, and its microwave signal input terminal receives the data stream output by the precoder to realize The optical domain non-return-to-zero DQPSK signal is modulated and output from the optical output port to the polarization controller or tunable optical attenuator; the optical input port of the tunable optical attenuator receives the modulated optical signal output from the lower branch DQPSK modulator, adjust The optical p...

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Abstract

The invention relates to a method and a system for transmitting and receiving by orthogonally dual-polarized differential quaternary phase shift keying. The system comprises a transmitting device and a receiving device, wherein the transmitting device comprises a continuous laser; the continuous laser is connected with a polarization beam splitter which is connected with a DQPSK modulator; the DQPSK modulator is connected with a precoder of which the output end is connected with a tunable optical attenuator or a polarization controller; and the polarization controller is connected with a polarization beam combiner; and the receiving device comprises a DQPSK demodulator, and the DQPSK demodulator is connected with a balanced detector which is connected with a decision circuit. In the method, four paths of electrical signals can be multiplexed, and only one demodulator and two balanced detectors are used at a receiving end to demodulate two orthogonally polarized DQPSK signals at the same time; therefore, compared with D8PSK and x-QAM systems, the system has the advantages of greatly reducing the complexity and remarkably enhancing the stability of components.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a method for transmitting and receiving by orthogonal dual polarization differential quadrature phase shift keying and a system thereof. Background technique [0002] A variety of modulation methods are used in digital communication systems. Among them, polyphase key shift modulation is valued for its good spectrum utilization and bit error rate performance. Polyphase key shift is a modulation format that stores information in the phase of the transmitted signal. With the rapidly growing demand for large-capacity communication in the information society, operators in the optical fiber communication industry are currently upgrading single-channel 10Gbit / s systems to 40Gbit / s systems, and are also accumulating technologies for upgrading to 100Gbit / s or even 160Gbit / s systems . [0003] At present, the methods to achieve 100Gbit / s optical transmission system mainly include wave...

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Application Information

Patent Timeline
24 Nov 2010
Publication
CN101895495A
IPC
H04L27/20; H04L27/22
Inventors
张晓光; 赵鑫媛