研究目的
To present a high-speed optical wireless communication link with a newly proposed pre-emphasis circuit to increase transmission performance at higher data rates.
研究成果
The proposed pre-emphasis circuit effectively improves the performance of optical wireless communications systems by compensating for low-pass frequency response, achieving significant BER power penalty improvements at multiple data rates, and offers an economical solution for high-speed applications.
研究不足
The pre-emphasis circuit's effectiveness may be limited by the bandwidth of the operational amplifier; higher data rates could require adjustments to passive components or use of higher-bandwidth amplifiers. The system was tested only at specific data rates and with a 1550 nm wavelength, and may not generalize to all optical wireless scenarios.
1：Experimental Design and Method Selection:
The study uses an optical wireless link with a pre-emphasis circuit based on a modified Sallen-Key high-pass active filter to compensate for low-pass frequency response. Data signals are modulated with on-off keying (OOK) format at 155, 622 Mbps, and
2：244 Gbps. Sample Selection and Data Sources:
The optical wireless link is implemented using existing laser communications components operating at 1550 nm, with data signals generated by a pulse pattern generator.
3：List of Experimental Equipment and Materials:
Includes Anritsu BERTWave MP2100A pulse pattern generator, Picosecond Model 5865 linear amplifier, Thorlabs LN82S-FC Optical Intensity Modulator, Santec WSL-100 Tunable Laser Source, Thorlabs ACL50832U-B aspheric lens, Thorlabs FRP232 Fresnel lens, Optilab EDFA-I-16-B EDFA, Thorlabs VOA50-FC VOA, and Analog Devices AD8045 operational amplifier.
4：Experimental Procedures and Operational Workflow:
Electrical data signals are generated, passed through the pre-emphasis circuit, amplified, used to modulate a laser, transmitted through free space, received, amplified, and BER measurements are taken with and without the pre-emphasis circuit.
5：Data Analysis Methods:
BER measurements are performed using an Anritsu BERTWave MP2100A Bit Error Rate Tester, with optical power varied to assess performance improvements.
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Optical Intensity Modulator
LN82S-FC
Thorlabs
Converts electrical signals to optical signals.
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Tunable Laser Source
WSL-100
Santec
Produces continuous wave light source at 1550 nm.
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Aspheric Lens
ACL50832U-B
Thorlabs
Reverses divergence of laser beam.
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Fresnel Lens
FRP232
Thorlabs
Focuses transmitted light beam.
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Erbium-Doped Fiber Amplifier
EDFA-I-16-B
Optilab
Amplifies optical signals to compensate for losses.
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Variable Optical Attenuator
VOA50-FC
Thorlabs
Varies optical power for BER measurements.
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Operational Amplifier
AD8045
Analog Devices
Used in the pre-emphasis circuit for active filtering.
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Pulse Pattern Generator
MP2100A
Anritsu BERTWave
Generates electrical data signals for testing.
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Linear Amplifier
5865
Picosecond
Amplifies the signal to drive the optical modulator.
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