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Few-mode preamplified coherent receiving system and method for free space optical signal

A free space, pre-amplification technology, applied in transmission systems, electromagnetic receivers, electromagnetic wave transmission systems, etc., can solve the problems of inapplicability of mode diversity receiving systems, achieve low power consumption, simple system structure, and reduce ADC bit width the effect of the demand

Inactive Publication Date: 2020-12-01
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Such a complex mode diversity reception system is not suitable for resource-constrained FSOC systems

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  • Few-mode preamplified coherent receiving system and method for free space optical signal

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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0039] The few-mode pre-amplification coherent receiving method and system for free-space optical signals provided by the present invention can resist the influence of atmospheric turbulence on the performance of FSOC systems, while reducing the receiver system complexity and power consumption.

[0040] Such as figure 1 Shown is a schematic structural diagram of a few-mode preamplified coherent...

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Abstract

The invention discloses a few-mode pre-amplification coherent receiving system and method for a free space optical signal. The system comprises a coupling lens, a few-mode optical fiber, a few-mode erbium-doped optical fiber amplifier, an optical band-pass filter, a local oscillator laser, a spatial optical coupler, a multi-mode optical detector, an analog-to-digital converter and a digital signalprocessing system. An incident light signal is coupled into the few-mode optical fiber through the coupling lens and is input into the few-mode erbium-doped optical fiber amplifier. A few-mode optical signal generated after amplification is filtered by an optical band-pass filter and then combined with local oscillation light through a spatial optical coupler to form a pseudo single sideband signal. And finally, after analog-to-digital conversion of the analog-to-digital converter and processing of the digital signal processing system, an input signal light field is reconstructed, and the influence of inter-mode dispersion is eliminated. The system has the advantages of being high in optical signal coupling efficiency, high in sensitivity, simple in structure and the like.

Description

technical field [0001] The invention belongs to the fields of optical fiber communication, free space optical communication (FSOC), optical signal detection and digital signal processing, and more specifically relates to a few-mode preamplified coherent receiving system and method for free space optical signals. Background technique [0002] For satellite-to-satellite communication, the traditional microwave communication method has encountered bottlenecks due to capacity limitations, while free space optical communication has become a major player in satellite-to-satellite communication due to its advantages of high capacity, high confidentiality, and reusable spectrum resources. best choice. However, due to the turbulence of the atmosphere, it becomes difficult for FSOC to couple the space optical signal into the single-mode fiber (SMF), that is, the coupling efficiency decreases; at the same time, factors such as the absorption of the signal power by the atmosphere, the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/61
CPCH04B10/614H04B10/6151H04B10/6161H04B10/6163
Inventor 崔晟龚琳杰饶宸杰
Owner HUAZHONG UNIV OF SCI & TECH
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