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Optics Letters

Multiwavelength optical storage by waveguide phase modulation

Zian Li, Run-Duo Chen, Jun-Fang Wu, Chao Li

Published Oct 8, 2026• 0 citations
Publisher

Abstract

Multiwavelength optical storage is critical in signal processing and optical computing. However, so far, most of the proposed light storage systems support only a single working band. Here, we propose a multiwavelength light storage mechanism based on dynamic waveguide phase modulation in a system composed of several pairs of nanocavities side-coupled to a waveguide. Unlike methods based on modulating intrinsic cavity parameters, our approach dynamically manipulates the waveguide propagation phase by introducing local refractive index modulation on a single common waveguide section, triggering all coupled resonator subsystems for multiwavelength light control. This simple approach offers a promising venue for high-density on-chip optical buffering.

DOI
10.1364/ol.601864

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Multiwavelength optical storage is critical in signal processing and optical computing. However, so far, most of the proposed light storage systems support only a single working band. Here, we propose a multiwavelength light storage mechanism based on dynamic waveguide phase modulation in a system composed of several pairs of nanocavities side-coupled to a waveguide. Unlike methods based on modulating intrinsic cavity parameters, our approach dynamically manipulates the waveguide propagation phase by introducing local refractive index modulation on a single common waveguide section, triggering all coupled resonator subsystems for multiwavelength light control. This simple approach offers a promising venue for high-density on-chip optical buffering.
It is theoretically shown that storage and time reversal of light pulses can be achieved in a coupled-resonator optical waveguide by dynamic tuning of the cavity resonances without maintaining the translational invariance of the system. The control exploits the Bloch oscillation motion of a light pulse in the presence of a refractive index ramp, and it is therefore rather different from the mechanism of adiabatic band compression and reversal proposed by Yanik and Fan in recent works [Phys. Rev. Lett., 92, 083901 (2004); 93, 173903 (2004)].
Although the approach of forming an ultrahigh-Q nanocavity via local refractive index tuning in a PC waveguide was proposed a decade ago, it has not yet been employed to realize a moveable ultrahigh-Q nanocavity, so the dynamic physics related to a moving resonator remain unknown. Here we demonstrate that a dynamically-formed cavity is essentially moveable, so we can use this nanocavity to trap, store, and transfer signal photons, enabling greater photon control. For a high cavity moving speed, we find the trapped signal energy will radiate out of the moving cavity. We think this interesting phenomenon originates from Doppler-effect-induced resonant frequency split in a moving resonator and the accompanied Purcell-like effect, which has never been reported before, to the best of our knowledge. In addition, we present an analytical model to reveal why and how the trapping and storing processes are accompanied by significant spectral bandwidth compression and dynamic wavelength conversion, which are critical for achieving dynamic ultrahigh-Q nanocavity. This approach may find application in photon memories, quantum computing, and controllable light-matter interactions.
Optical resonators with controllable Q factors are key components in many areas of optical physics and engineering. We propose and investigate a Q -factor controllable system composed of two directly coupled microring resonators, one of which is tunable and coupled to dual waveguides. By shifting the resonance of the controllable microring, the Q factor of the system as well as the other microring changes significantly. We have demonstrated wide-range controllable Q factors based on this structure in silicon-on-insulator, for example. The influences of spectral detuning and coupling strength between two resonators on the variation of Q factors are studied in detail experimentally. Then, we explore its applications in optical buffering. Tunable fast-to-slow/slow-to-fast light has been carried out by switching the system between the high- Q state and low- Q state. Moreover, optical pulse capture and release are also achievable using this structure with dynamic tuning, and the photon storage properties are investigated. The proposed Q -factor tunable system is simple, flexible, and realizable in various integrated photonic platforms, allowing for potential applications in on-chip optical communications and quantum information processing.
Manipulating refractive index in time allows one to implement quantum storage in an extended resonant atomic system without recourse to inhomogeneous broadening of optical transitions or amplitude modulation of control fields, which when combined with other storage techniques provides the possibility to improve mode or channel capacity of optical storage devices. We discuss different methods of refractive index manipulation in the context of quantum storage applications, giving special attention to a simple frequency shift of an absorption structure relative to the resonant energy levels. We show that a linear modulation of refractive index in time without significant losses can be realized in doped solid-state materials such as Er3+ :Y2SiO5 crystal, to provide optical quantum storage.
An approach to store light dynamically in slow light waveguides is proposed. First, design guidelines are developed for waveguides that allow dynamic group velocity control. Then an example of a silicon photonic crystal waveguide is presented where group velocity can be drastically reduced by applying a refractive index change of−5.5×10−2{-}{5.5}\times 10^{-2}−5.5×10−2to a specific part of the waveguide. Performing the index change while a light pulse is confined to the waveguide, we show by numerical simulations a tunable storage time of more than 70 ps for a pulse of 60 GHz bandwidth. We argue that the magnitude of the required change of the refractive index can be reduced by mode optimization.
One of the major advances needed to realize all-optical information processing of light is the ability to delay or coherently store and retrieve optical information in a rapidly tunable manner. In the classical domain, this optical buffering is expected to be a key ingredient of managing the flow of information over complex optical networks. Such a system also has profound implications for quantum information processing, serving as a long-term memory that can store the full quantum information contained in an optical pulse. Here, we suggest a novel approach to light storage involving an optical waveguide coupled to an optomechanical crystal array, where light in the waveguide can be dynamically and coherently transferred into long-lived mechanical vibrations of the array. Under realistic conditions, this system is capable of achieving large bandwidths and storage/delay times in a compact, on-chip platform.