Abstract
We discuss how dynamic light stopping and pulse time reversal can be implemented in dispersive waveguides via indirect photonic transitions induced by moving refractive index fronts. The previous concepts of light stopping/time reversal either require complex local variation of the device’s refractive index or rely on the strict phase matching condition, which imposes limitations on the amount of manipulated information. Until now, only single pulses or continuous waves were manipulated experimentally. Our scheme is not limited by a strict phase matching condition and does not require local index variations, thus it can manipulate broadband signals in a single step process. Here, we present several numerically integrated results for pulse time reversal and stopping/storage via indirect front-induced transitions. The presented results are experimentally feasible using existing photonic waveguide technologies.
Highlights
Dynamic control of optical pulse propagation in dispersive waveguides has potential applications in many fields, such as signal processing,1 optical,1 and quantum communications.2 For instance, the time reversal of light pulses,3–6 which means that the time order of the incident light is reversed, can be used to send information back, compensating the additional phase distortions in the transmission system
We have shown a scheme for dynamic pulse time reversal and stopping in optical waveguide systems via indirect front induced transitions (FITs)
In contrast to other schemes, pulse time reversal/stopping via FITs are not limited by a strict phase matching condition, and broadband signals can be time reversed/stopped even in non-parallel and curved dispersion bands
Summary
Dynamic control of optical pulse propagation in dispersive waveguides has potential applications in many fields, such as signal processing, optical, and quantum communications. For instance, the time reversal of light pulses, which means that the time order of the incident light is reversed, can be used to send information back, compensating the additional phase distortions in the transmission system. Light storage and release by direct transition, when light experiences frequency change only, in photonic waveguides has been theoretically proposed by Yanik et al.12,18 In this case, the dispersion relation is modified to have a zero slope in a switched state and the signal. The initial state can be projected to the part of the dispersion relation with the required slope In this regard, the front-induced time-reversal and pulse stopping schemes provide a single platform that can implement both frequency conversion and time reversal/pulse stopping of arbitrary envelopes at the same time, which will be useful for major applications in the future optical communication systems. We discuss how to realize these effects in real systems
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