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Direct modulation MOPA pulse fibre-optic laser applied to underwater wireless optical communication transmitting end

A laser and pulse technology, applied in the direction of lasers, electromagnetic transmitters, laser components, etc., can solve problems such as difficult to drive, difficult to obtain high-power green laser, and achieve the effect of improving performance, high power, and high quality

Pending Publication Date: 2022-01-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the problem that high-power green laser is difficult to obtain and drive in the underwater wireless optical communication system, and provides an underwater transmitter device and a direct modulation method

Method used

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  • Direct modulation MOPA pulse fibre-optic laser applied to underwater wireless optical communication transmitting end
  • Direct modulation MOPA pulse fibre-optic laser applied to underwater wireless optical communication transmitting end
  • Direct modulation MOPA pulse fibre-optic laser applied to underwater wireless optical communication transmitting end

Examples

Experimental program
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Effect test

Embodiment Construction

[0016] The transmitter of the underwater wireless optical communication system consists of three parts: the seed source drive part, the optical amplification part and the frequency doubling part

[0017] The seed source driving part includes: an electrical signal generating device (FPGA or arbitrary waveform generator), an electrical power amplifying device (radio frequency power amplifier) ​​and a seed source laser diode. The electric signal generating device generates an electric signal after shape-shaping the pulse, and directly drives the semiconductor seed source laser after being amplified by the power amplifier.

[0018] The optical amplification system includes: optical isolator, pump combiner, pump source, doped fiber and polarization controller. Among them, each stage of amplification is composed of a pump source, a pump combiner, an optical isolator, and a doped fiber, and the optical amplification system can be composed of multi-stage amplification. The pump sourc...

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Abstract

In the invention, according to Frantz-Nodvik-equations, after parameters such as the order of pulse position modulation (PPM), the width of pulses and the like are determined, different pulse interval time generated by the PPM is calculated, intensity tables are generated at different pulse intervals, and data is stored; in actual use, after information is modulated in a PPM mode, corresponding electric signals are generated according to the generated intensity tables, and the electric signals are output; after being amplified by a power amplifier, the electric signals directly drive a seed source of an MOPA system to generate seed light with signal modulation; and the seed light is amplified through a multi-stage ytterbium-doped fibre-optic amplifier, and generated high-power fundamental frequency light becomes green laser capable of being used for underwater wireless optical communication after being subjected to frequency doubling.

Description

Technical field: [0001] The invention relates to an underwater transmitter device, in particular to a transmitter device based on a MOPA pulse laser design and provides a modulation method for stabilizing a pulse waveform, belonging to the technical field of underwater wireless optical communication . Background technique: [0002] With the development of economy and science and technology, human resources are increasingly scarce, and ocean development has become the focus of attention of all countries. Underwater wireless optical communication technology has received extensive attention from academia and industry due to its unique characteristics of high bandwidth, low delay, and good directionality. At present, the underwater wireless optical communication system is mainly restricted by the key problem of short transmission distance. Commonly used semiconductor lasers cannot achieve high power output in the green light band, and it is difficult to design high-power and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/524H04B10/80H01S3/067H01S3/109
CPCH04B10/504H04B10/524H04B10/80H01S3/06758H01S3/109
Inventor 徐敬张超邹海吾张雨凡张皓宋广斌
Owner ZHEJIANG UNIV
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