Fig. 6

Experimental results of microwave time delay and frequency identification. a Time-domain measurement when the fabricated grating is reconfigured to be a chirped grating. b Peak wavelength shift and power consumption with the bias voltages. c Estimated frequencies when the wavelength of the optical carrier is 1538.307 nm. d Estimated frequencies when the wavelength of the optical carrier is 1538.227 nm. e Two-frequency measurement test when the wavelength of the optical carrier is swept from 1538.227 to 1538.307 nm