Performance analysis and design of tapered and chirped nonlinear Bragg gratings for application to optical isolators

摘要

Performance analysis of optical isolators based on the nonreciprocal property of optical bistability in tapered and chirped nonlinear Bragg grating (NLBG) has been carried out. The design method for detuning adjustment according to input power level and expected on-off ratio is also provided. The results display that, for tapered NLBG, the broad operation range and greater on-off ratio can be achieved by using larger taper slope; there exists an optimization range of chirp coefficient for chirped NLBG; the operation range boundary is shifted toward lower input power with the increased detuning; and the tapered NLBG is more preferable to obtain the larger on-off ratio and wider operation range simultaneously compared with chirped NLBG.