Studying Optimal Configuration of Microwave-Photonics Long-Term Time Delay Circuit Based on Fiber-Optics Recirculating Loop

An updated approach to configure a microwave-photonics-based long-term radio-frequency memory using recirculating delay line structure is proposed and discussed. As clear validated by the results of modeling and experimental research, the proposed circuit in comparison with the known approaches is provided the trade-off between output power drop and noise rise with increasing number of re-circulations. Specifically, more than 5-fold shorter delay step, better transmission gain flatness of super-wide bandwidth radio-frequency signal, smaller dimensions mainly due to multicore fiber application, and lower power consumption using less number of needed optical amplifiers are demonstrated.