The transmission characteristics of analogue video signals are investigated by using semiconductor laser diodes. It is shown that the linearity degradation due to speckle noise depends on the optical-fibre types adopted. Based on this investigation, transmission over 32 km is carried out by using a 1·3 μm laser diode and single-mode fibres, with 46 dB unweighted s.n.r.
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Sato et al. (1979) studied this question.
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