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Coherent reception communication method and system of DSP-free dual-polarization QAM modulation

A technology of coherent reception and communication system, applied in the field of coherent reception communication methods and systems, and can solve problems such as complex implementation

Pending Publication Date: 2019-03-22
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, in the above scheme, there are as many as three feedback control quantities for polarization aliasing compensation, and the implementation is relatively complicated.

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  • Coherent reception communication method and system of DSP-free dual-polarization QAM modulation

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the description of the drawings and specific embodiments.

[0021] Such as figure 1 As shown, a DSP-free dual-polarization QAM modulation coherent reception communication method, in order to remove the carrier recovery module in the DSP algorithm, adopts the self-homodyne detection method. Such as figure 1 As shown, after the optical carrier emitted by the laser 11 is split by the beam splitter 12, one of them is used as a signal carrier, and the other is used as a local oscillator to beat the received signal. At the same time, introducing a phase retarder 13 into the local oscillator optical path has realized the phase matching of the local oscillator light and the signal light, and the phase delay can be realized by directly adding a section of optical fiber or using electro-optical effects. Through the above method, there is no frequency offset and phase difference between the intrinsic light...

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Abstract

The invention provides a coherent reception communication method of DSP-free dual-polarization QAM modulation. A laser is located on a signal receiving end, the emitted light is split by a beam splitter, one path of which is used as a signal carrier and the other path of which is used as a local oscillator light, the local oscillator light is imported into a phase delayer to achieve the phase matching between the local oscillator light and signal light, the signal carrier emitted by the laser is transmitted to a signal transmitting end after passing through a transmission link, is reflected bya Faraday rotating mirror after being modulated by a dual-polarization IQ modulator, is returned to the original transmission link and performs beat frequency with the local oscillator light at last.The invention further provides a coherent reception communication system of DSP-free dual-polarization QAM modulation. The coherent reception communication method and system provided by the inventionhave the beneficial effects that the local oscillator light and the signal carrier have no frequency offset or phase difference, therefore no carrier recovery is required.

Description

technical field [0001] The invention relates to short-distance optical communication, in particular to a DSP-free dual-polarization QAM modulation coherent receiving communication method and system. Background technique [0002] With the vigorous development of services such as data centers, 5G, and big data, the demand for global communication traffic has shown a rapid growth trend. In order to meet the communication requirements of technologies such as cloud computing and the Internet of Things, data center interconnect (DCI) has become the main target of short-distance transmission systems. According to the forecast of the Cisco Global Cloud Index, the information exchange volume of DCI in 2020 will reach 15 Zbit, which has tripled compared to 2017. Among them, nearly 77% of the communication interacts within the data center, mainly including data generation, storage, processing and verification. In the data center interconnection communication system, high transmission...

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Application Information

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IPC IPC(8): H04B10/61H04B10/63H04B10/516H04B10/50
CPCH04B10/503H04B10/516H04B10/5161H04B10/61H04B10/612H04B10/614H04B10/615H04B10/63Y02D30/70
Inventor 杨彦甫范林生向前
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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