METHOD OF AND DEVICE FOR CONTROLLING THE PHASE OF A CLOCK SIGNAL IN A POINT-TO-POINT OPTICAL TRANSMISSION

摘要

The signal to be controlled is sent along an optical fibre (3) by means of a wavelength tunable laser (2) whose emission wavelength may be varied as a fu nction of a possible phase variation in the received signal with respect to a refer ence phase. At the receiving end of the fibre a control signal is generated by extractin g a fraction of the power associated with the received signal and sending such fraction back towards the transmitting end, and at the transmitting end the phase of said fraction is compared with that of the original signal and the tunable laser is driven (2) in such a way as to transmit at a wavelength such that the clock information reaches the receivi ng end with the reference phase.