Broadband Linearization of Dispersive Delay Line Using a Chirped Fiber Bragg Grating

Abstract

A design of chirped fiber Bragg gratings (CFBGs) for the compensation of higher order dispersion in dispersive delay lines of microwave photonic (MWP) filters driven by broadband sources is presented. It is shown that the modification of the dispersion slope of a nonlinearly CFBG can compensate for third-order dispersion in relatively broad optical bands, resulting in a linear correspondence between group delay and optical frequency. The concept is demonstrated by use of a custom modification of a commercial, low-ripple CFBG for dispersion compensation in 20 nm of the C-band. This broadband linear dispersive delay line is used to provide shape invariance in both the resonance's amplitude and phase responses of single-passband MWP filters based on double-sideband modulation. The dispersion of the delay line is shown to be tunable in the range −170.0 to −143.3 ps/nm by the addition to the CFBG of different lengths of single-mode fiber, without compromising shape invariance.Index Terms-Fiber Bragg gratings, optical delay lines, higher-order dispersion, radio frequency photonics, microwave filters, photonic signal processing.

Research on the acquisition of time‐reversed electromagnetic waves based on Fourier transform theory

“…According to the theoretical analysis above, as the core device of analog time reversal mirror system, CDDL can be used not only for chirp signal generation, dispersion compensation, but also for determining the scale of signal waveform transformation. [12][13][14] Therefore, an efficient and compact passive microwave chirped dispersion device can effectively reduce the cost of waveform inversion system and improve the efficiency of the whole time-inversion system. Through modulating the characteristic impedance and combining with the Prague fiber grating technology, 15,16 two CDDLs which meet the system requirements shown in Figure 2 have been designed.…”

Mitigation of Dispersion Induced Impairments in Brillouin-Based Microwave Photonic Bandpass Filter

“…Mitigation of dispersion induced impairments, is therefore, necessary to realize an efficient, large out-of-band rejection MPBFs. However, there have been very few reports of dispersion compensation in MPBFs [34], [41], [42].…”