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Self-coherent signal transceiving method and device

The technology of a signal transmitting device and a signal receiving device is applied in the field of self-coherent signal transmitting and receiving methods and devices, which can solve the problems of reduced signal receiving sensitivity, complicated implementation devices and testing methods, etc., so as to improve the signal receiving sensitivity, reduce the complexity, and avoid the Effects of the Dispersion Compensation Module

Active Publication Date: 2019-10-18
FENGHUO COMM SCI & TECH CO LTD
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Problems solved by technology

However, the implementation device and test method of high-order modulation are more complicated, and the receiving sensitivity of the signal will be significantly reduced

Method used

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  • Self-coherent signal transceiving method and device
  • Self-coherent signal transceiving method and device
  • Self-coherent signal transceiving method and device

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Embodiment Construction

[0057] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0058] This embodiment provides a self-coherent signal transmission method, including steps:

[0059] The two components of I and Q that generate the IQ signal are filtered and amplified respectively, and then IQ modulated to output the IQ modulated optical signal. The IQ signal may be a quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK) signal, or may be a 16QAM (16Quadrature Amplitude Modulation, quadrature amplitude modulation) signal, a 256QAM signal, or the like.

[0060] At the same time, a Cos clock signal and a Sin clock signal are generated, and the two clock signals are respectively amplified, and then IQ modulated to output an optical pilot signal.

[0061] Finally, the optical power of the IQ modulated optical signal and the optical pilot signal is adjusted, and the synthesized self-coherent optical signal is sent...

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Abstract

A self-coherent signal transceiving method and a device relate to the field of short-distance optical transmission, and the method comprises the steps: generating an IQ signal for IQ modulation, and outputting an IQ modulation optical signal; meanwhile, generating two paths of clock signals for IQ modulation, and outputting a light guide frequency signal, so that the intensity of the light guide frequency signal is greater than that of the IQ modulation optical signal; and synthesizing the IQ modulation optical signal and the light guide frequency signal into a self-coherent optical signal andsending out the self-coherent optical signal; receiving and sampling a self-coherent optical signal; taking a square root to obtain an optical signal amplitude A (n); performing up-sampling to obtainan optical signal amplitude A '(m); taking a natural logarithm of an up-sampling signal and then carrying out Hilbert transform; extracting a phase and outputting the signal, performing digital down-conversion for obtaining a baseband signal, then performing down-sampling for obtaining a baseband signal, and finally performing dispersion compensation and signal recovering on the baseband signal.According to the method and the device, through IQ modulation and direct detection, the complexity of the system is reduced, and the signal receiving sensitivity is improved.

Description

technical field [0001] The invention relates to the field of short-distance optical transmission, in particular to a method and device for transmitting and receiving self-coherent signals. Background technique [0002] The optical system architecture of intensity modulation and direct detection is widely used in the field of short-distance optical transmission within 20 kilometers due to its simple structure. However, with the continuous improvement of the transmission rate, the field of short-distance optical transmission faces the following bottlenecks: (1) the dispersion cost of the above-mentioned system is high, and the wavelength needs to be close to the zero-dispersion region; (2) the bandwidth of optoelectronic devices is limited, and the above-mentioned system will introduce larger intersymbol crosstalk. [0003] On the one hand, optical spectrum resources are limited, especially in zero dispersion regions. The new wavelength planning is bound to be far away from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/54H04B10/556H04B10/61H04B10/114
CPCH04B10/114H04B10/541H04B10/5561H04B10/612H04B10/6161
Inventor 胡荣王志军王素椅
Owner FENGHUO COMM SCI & TECH CO LTD
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