A preferable set for stabilizing the intermediate frequencies(IF)of optical heterodyne

A preferable set for stabilizing the intermediate frequencies of optical heterodyne in optical coherent communications system is developed.A high stability for intermediate frequencies of optical heterodyne may be realized by this set,and stabilizing intermediate frequencies can be adjusted freely.In the coherent optical fiber communication system adopting 1.52μm He Ne lasers,the tracking stabilization of optical heterodyne intermediate frequencies may be covered in the range of full TV channel when this set is used.Relative to the optical frequency,the frequency stability is better than 10-9.