The authors describe the optically supported generation of a 30 GHz MM-wave signal, with an electrical linewidth of <1 Hz, from a spectrum slice of the ASE noise output of an EDFA. The technique described has the potential to significantly reduce the cost of a WDM-based fibre MM-wave radio system.
Lane, PM., & Kitayama, K. (1998). Optical generation of mm-waves using spectrum-sliced ASE for low-cost WDM based fibre radio systems. Electronics Letters, 34(10), 1010-1011. https://doi.org/10.1049/el:19980713