10−9 bit error rates have been achieved over a distance of 6.3 km in a millimetre wave fibre-optic phase shift keying subcarrier transmission system operating at 35 GHz for a 40 Mbit/s narrowband digital signal. Using a grating in the external cavity for wavelength control, the transmission distance was extended from 200 m to 6.3 km.
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Levy et al. (1993) studied this question.