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Method for adaptively adjusting transmitting power of atmospheric optical communication system according to channel state

An adaptive adjustment and atmospheric laser communication technology, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve problems such as increased communication bit error rate and decreased detection signal-to-noise ratio

Active Publication Date: 2017-05-31
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

When the laser signal fades, the detection signal-to-noise ratio of the receiver will decrease, resulting in an increase in the communication bit error rate

Method used

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  • Method for adaptively adjusting transmitting power of atmospheric optical communication system according to channel state

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Embodiment 1

[0024] Embodiment 1 The laser is a distributed feedback laser with a wavelength of 1550nm, and the electro-optic modulator is LiNbO 3 The Mach-Zehnder modulator, the Erbium-doped fiber amplifier is selected from Shijie SG-EDFA-21dB Erbium-doped fiber amplifier, and the fiber optic circulator is ThorLabs fiber optic circulator.

[0025] Such as figure 1 As shown in the figure, a two-way atmospheric laser communication system is composed of two transceivers sharing single-mode fiber-coupled laser communication transceivers with the same structure to send and receive information; the two-way atmospheric laser communication system The first laser communication transceiver includes laser 1 (101), electro-optic modulator 1 (102), erbium-doped fiber amplifier S1 (103), fiber circulator 1 (104), convex lens 1 (108), data modulation control Module 1 (109), erbium-doped fiber amplifier R1 (110), Fabry-Perot filter 1 (111), optical tunable filter 1 (112), detection sampling decision mo...

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Abstract

The invention relates to a method for adaptively adjusting the transmitting power of an atmospheric optical communication system according to a channel state. The method is characterized by comprising the following steps: sending and receiving information by using a transmit-receive single-mode optical fiber coupling laser communication transceiver, and forming a bidirectional atmospheric optical communication system by using two transmit-receive single-mode optical fiber coupling laser communication transceivers having the same structure. The bidirectional atmospheric optical communication system can adaptively adjust the peak transmitting power of laser pulse according to the instantaneous channel state, namely, in the case of optical signal fading, the peak transmitting power of the laser pulse is increased at a transmitting end to compensate the negative impact generated by atmospheric turbulence.

Description

technical field [0001] The invention relates to a method for adaptively adjusting the transmission power of an atmospheric optical communication system according to the channel state, and belongs to the technical field of atmospheric channel laser communication. Background technique [0002] The influence of atmospheric turbulence is a research difficulty in the field of atmospheric channel laser communication technology. Atmospheric turbulence causes random fluctuations in the intensity of the laser signal. When the laser signal fades, the detection signal-to-noise ratio of the receiver will decrease, resulting in an increase in the communication bit error rate. In this case, in order to compensate for the effect of laser signal fading, the peak emission power of the laser pulse can be increased. For a laser communication transmitter that uses an erbium-doped fiber amplifier (EDFA) for optical amplification, if the EDFA works in the saturation region, the transmitter can ...

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Application Information

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IPC IPC(8): H04B10/564
CPCH04B10/564
Inventor 陈纯毅杨华民娄岩佟首峰
Owner CHANGCHUN UNIV OF SCI & TECH
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