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This paper proposes and analyses a novel technique to generate a set of optical carriers from an optical reference comb of frequencies. This is achieved by using an optical phase or frequency locked loop as an optical frequency synthesiser. Theoretical models and practical results are presented. The implementation of such a technique is described in the context of an VFDM photonic MAN currently under development. The paper concludes with the merits of both loop designs being considered and contrasted.

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We report characterisation of ISRS, Kerr-nonlinearity and the first demonstration of error-free DWDM transmission with 38×400G signals using commercial 400ZR QSFP-DD modules through a field deployable 10.25km hollow-core NANF cable with <1.2dB/km loss from 1525-1625nm.

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