基于模拟基带调制的光纤视频传输

A. Tenne-Sens, D. Johnson
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引用次数: 1

摘要

光纤技术为视频信号的传输提供了一种新的介质。与同轴电缆相比,光纤的一些优点是:带宽宽,不需要均衡;不受RFI、串扰和环路问题的影响;低衰减;体积小,重量轻。本文对一种模拟光纤链路在单根光纤上传输基带视频信号进行了评估。研究发现,如果使用衰减为5 dB/km的光纤,则可以在长达2.2 km的链路上获得工作室质量的信噪比。对线性视频失真和非线性视频失真进行了测量,并与商用网络单跳中继标准进行了比较。除了色度/亮度增益比略低外,所有失真值均在标准范围内。这种畸变可以通过修改光学接收器的电子器件来纠正。差分增益和相位畸变随光发射机发光二极管的调制因子线性增加,但当该因子为0.5或更小时均在网络标准范围内。
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Optical-Fiber Video Transmission Using Analog Baseband Modulation
Optical-fiber technology provides a new medium for the transmission of video signals. Some of the advantages which optical fibers have over coaxial cables are: wide bandwidth without the need for equalization; freedom from RFI, crosstalk and loop problems; low attenuation; and small size and low weight. In this paper, an analog optical-fiber link was evaluated for the transmission of baseband video signals over a single fiber. It was found that studio-quality signal-to-noise ratios could be obtained for links up to 2.2 km in length if an optical fiber having an attenuation of 5 dB/km were used. Linear video distortion and nonlinear video distortion measurements were made and compared with commercial-network single-hop relay standards. All of the distortion figures were within the standards except for a slightly low chrominance/luminance gain ratio. This distortion could be corrected by modifying the optical receiver electronics. Differential gain and phase distortions were found to increase linearly with the modulation factor of the optical transmitter's light-emitting diode, but were within network standards when the factor was 0.5 or less.
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