研究目的
Investigating the feasibility of using an optical frequency comb (OFC) as a carrier source for a one-to-many free-space optical (FSO) communication system under various atmospheric turbulence conditions.
研究成果
The experiment demonstrates the feasibility of using an OFC as a carrier source for a one-to-many FSO communication system, capable of stably transmitting a 24.5 Gb/s OOK signal under various atmospheric turbulence conditions. The system shows good transmission stability and performance, suggesting its potential for future spatial network applications.
研究不足
The study is limited to simulating atmospheric turbulence conditions in a controlled environment. The actual performance in real-world atmospheric conditions may vary. The system's performance is tested up to a transmission rate of 24.5 Gb/s, and higher rates may present additional challenges.
1：Experimental Design and Method Selection:
Cascading Mach–Zehnder intensity modulator (MZIM) and phase modulator (PM) to generate an OFC with 7 flat comb teeth. The OFC is used as the carrier source for the FSO communication system. Atmospheric turbulence simulation pool is used to simulate turbulence intensity in the real atmosphere.
2：Sample Selection and Data Sources:
The OFC with 7 flat comb teeth, frequency interval of 25 GHz, and flatness less than 1.5 dB is used. The system's performance is tested under back-to-back (BTB) conditions and different atmospheric turbulence intensities (80 ?C, 150 ?C, and 220 ?C).
3：5 dB is used. The system's performance is tested under back-to-back (BTB) conditions and different atmospheric turbulence intensities (80 ?C, 150 ?C, and 220 ?C). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Continuous wave (CW) laser, Mach–Zehnder intensity modulators (MZIM), phase modulator (PM), arbitrary waveform generator (AWG), electric amplifiers (EA), optical complex spectrum analyzer (OCSA), erbium-doped fiber amplifier (EDFA), air-spaced doublet collimator, atmospheric turbulence simulation pool, photodetector (PD), eye diagram analyzer, BER tester.
4：Experimental Procedures and Operational Workflow:
The OFC is generated and modulated into the FSO communication system. The system's performance is tested under various turbulence conditions by measuring BER and eye diagrams.
5：Data Analysis Methods:
The relationship between BER and transmission rate, time stability of BER, and the impact of atmospheric turbulence on system performance are analyzed.
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eye diagram analyzer
Agilent 86100C
Agilent
Used to observe the eye diagram of the signal.
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BER tester
keysight 8020A
Keysight
Used to measure the bit error rate (BER) of the signal.
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continuous wave laser
EXFO FLS-2800
EXFO
Initial light source for generating the OFC.
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arbitrary waveform generator
Keysight M8195A
Keysight
Provides a sinusoidal radio frequency (RF) drive signal to the modulators.
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air-spaced doublet collimator
Thorlabs, F810FC-1550
Thorlabs
Used as optical antennas to realize the coupling between optical fiber and free space.
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Mach–Zehnder intensity modulator
MZIM
Used to generate an optical frequency comb (OFC) with 7 flat comb teeth.
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phase modulator
PM
Used in cascading with MZIM to generate an OFC.
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electric amplifiers
EA
Amplifies the RF drive signal and provides direct-current (DC) bias voltage to the modulator.
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optical complex spectrum analyzer
APEX AP2400A
APEX
Used to observe the generated OFC.
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erbium-doped fiber amplifier
EDFA
Amplifies the power of the OFC.
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photodetector
PD
Converts the optical signal into the electrical signal.
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