NTT Corporation (NTT) and Tokyo Denki University have succeeded in further stabilizing the graduated frequency of an optical frequency ruler generated by modulating the intensity and phase of laser light in an electrical signal.
By using this result, it is possible to obtain a light source with a narrow linewidth whose frequency interval is 25 GHz, and it is expected to be applied to high-speed and large-capacity optical communications such as next-generation digital coherent transmission. In addition, microwaves with significantly reduced phase noise can be generated, which is expected to improve the accuracy of microwave generation and evaluation equipment.
An optical frequency comb (OFC) is an optical signal that has a comb-like emission line spectrum on the frequency axis, and is used for optical frequency measurement and precise frequency conversion from light to microwave.
This research was published in the British scientific journal, Scientific Reports on May 30, 2023, and was presented in an invited talk at PIERS2023, an international conference on photonics, electromagnetics and information communications, on July 3.