Stable lightwave frequency synthesis over 1-THz span using fabry-perot cavity containing polarization-rotation elements and actively controlled tunable bandpass filter

We realized a lightwave synthesized frequency sweeper which has a >1-THz sw eep span and operates stably. We employed an actively controlled tunable ba ndpass filter together with a Fabry-Perot cavity which consisted of a Farad ay rotator mirror and a polarization rotation mirror. We confirmed that the frequency information of an input pulse was preserved after 1000 round-tri ps in the cavity and that signal pulses could circulate stably for 12 h.