Method and system for controlling phase bias point of dual polarization quadrature phase shift keying modulator
A quadrature phase shift keying and phase offset technology, applied in the direction of phase modulation carrier system, etc., can solve the problems of phase offset point effect, inaccurate detection, and reduce the stability of DP-QPSK modulator, so as to avoid Effects of disturbances and uncertainties, high reliability and stability
Active Publication Date: 2015-08-12
ZTE CORP
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However, since the PD is a highly integrated device, it is often affected by external factors, and the difference frequency signal cannot be detected or the detection is inaccurate, which affects the effect of controlling the phase bias point of the DP-QPSK modulator. great influence
[0006] It can be seen that the existing methods for controlling the phase bias point of the DP-QPSK modulator cannot avoid the influence of factors such as inaccurate detection caused by highly integrated devices, thereby reducing the stability of the DP-QPSK modulator
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[0034] The basic idea of the present invention is: the difference frequency signal detection is carried out by the external detection and control equipment, when the detection result is no difference frequency signal, no operation is performed; when the detection result is not no difference frequency signal, the DP-QPSK modulator is adjusted according to the detection result the phase offset point.
[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0036] Such as figure 1 As shown, the present invention provides a system for controlling the phase bias point of a DP-QPSK modulator, including: a detection control device 11 and a DP-QPSK modulator 12; wherein,
[0037] The detection control device 11 is used to detect the difference frequency signal. When the detection result is no difference frequency signal, no operation is performed; when the detection result is not no difference...
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The invention discloses a system for controlling a phase bias point of a dual-polarization quadrature phase shift keying (DP-QPSK) modulator. The system comprises detection control equipment and a DP-QPSK modulator, wherein the detection control equipment is used for performing difference frequency signal detection, when the detection result is a difference frequency signal, no operation is performed, and when the detection result is not the difference frequency signal, the phase bias point of the DP-QPSK modulator is adjusted according to the detection result; and the DP-QPSK modulator is used for receiving the adjustment of the detection control equipment. The invention simultaneously discloses a method for controlling the phase bias point of the DP-QPSK modulator. By utilizing the system and the method, various interferences and detection inaccuracy during detection can be avoided, and then the degree of stability of the DP-QPSK modulator is ensured.
Description
technical field [0001] The invention relates to the field of information security in signal processing technology, in particular to a method and system for controlling the phase bias point of a dual polarization quadrature phase shift keying (DP-QPSK, Dual Polarization-QPSK) modulator. Background technique [0002] In recent years, with the improvement of the speed and capacity of the optical transmission system, the transmission rate of the optical transmission system has been increased to 40Gbit / s. Among the related technologies of the optical transmission system with a rate of 40Gbit / s, the optical phase modulation method represented by Differential Quadrature Phase Shift Keying (DQPSK, Differential Quadrature Phase Shift Keying) has attracted more and more attention from the industry. Since the symbol speed of DQPSK is only half of the traditional optical amplitude modulation method, the requirements for optical devices are much smaller; and because the DQPSK modulation ...
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IPC IPC(8): H04L27/20
Inventor 袁贺吕书生赵志勇
Owner ZTE CORP