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Optics Express

High transmission contrast for single resonator based all-optical diodes with pump-assisting

Xu-Sheng Lin, Yan Jun-hu, Lijun Wu, Sheng Lan

Published Dec 3, 2008• 53 citations
Publisher

Abstract

We present a detailed analysis of realizing the unidirectional transmission by using the bistability of a nonlinear optical resonator. We show that the transmission contrast can be enhanced by an order of magnitude if the upper branch of hysteresis loop is explored with pump-assisting. It provides all-optical diodes with simple configuration and high transmission contrast.

DOI
10.1364/oe.16.020949

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We present a detailed analysis of realizing the unidirectional transmission by using the bistability of a nonlinear optical resonator. We show that the transmission contrast can be enhanced by an order of magnitude if the upper branch of hysteresis loop is explored with pump-assisting. It provides all-optical diodes with simple configuration and high transmission contrast.
Fano resonance is widely used to realize high-contrast nonreciprocal transmission. However, resonance-enhanced all-optical diodes (AOD) are bandwidth-limited, and their transmission rates are normally low, which restricts realistic application. In this Letter, we analytically and numerically demonstrate that this limitation can be overcome once multistability of cascaded nonlinear cavities is appropriately excited. By precisely molding the transiting of the signal light between multistable states, a high-contrast-ratio, high-unidirectional-transmission-rate, and reversal-controllable AOD is achieved with a bandwidth over 2.4 nm, which is about two orders of magnitude wider than the reported results obtained by other methods based on Fano resonances. This approach may pave the way for dynamic control of on-chip all-optical information processing.
We propose and report the first experimental demonstration of a new type of active optical bistable device composed of an optical cavity and a lasing medium with a pumping source of either optical or nonopticai means. The basic principle underlying the operation of the optical bistable laser (OBL) is based on the stable-unstable cavity configuration transition of an active optical resonator. Generally speaking, a laser system showing both pump- and laser-induced tensing (focusing or defocusing) effects may display such a hysteresis loop in its input-output characteristics. Optical bistability (OB) based on self-focusing of light in a medium having a nonlinear refractive index has recently been shown experimentally.1
In this paper, the numerical studies on optical-bistability phenomena in third-, fifth-, and seventh-order nonlinear periodic media are presented. By cross-phase modulation with strong Gaussian pump, the continuous-wave probe transmission that operates in bistability regime can be permanently switched from low to high and vice versa using the property of the unstable state. While there is only one hysteresis in the third-order nonlinear periodic media, double hysteresis are observed in the nonlinear-transmission characteristics of pi phase-shifted periodic media with third-fifth and third-fifth-seventh-order nonlinearities. In the context of double hysteresis, unique-bistability regime is defined where the high state can be reached as input comes from low to high with fast enough rise time such that the output rises above the unstable state during its transient. Finally, all-optical transistor operation is shown as a prominent application of optical bistability based on the unstable-state principle
Summary form only given. We report results of an experiment in which the output of a single-mode diode laser is injected into a diode laser amplifier operated close to its lasing threshold. The injected light is periodically modulated at frequencies very slow compared with the relevant relaxation frequencies within the amplifier. In contrast to most experiments, we operate the amplifier in a reflection mode instead of the transmission mode. Under the influence of the periodic modulation, the amplifier output exhibits several novel types of hysteresis and associated bistable behavior.
Controlling the flow of light is fundamental for on-chip optical signal processing. In this paper, we investigate how to realize high contrast, high unidirectional transmission rate, and reconfigurable nonreciprocal light transmission, based on a nonlinear nanocavity asymmetrically side-coupled with a specially designed slow-light waveguide. We analytically and numerically demonstrate that the unusual multiple threshold pump power points for trigging the photon transitions between bistable states, as well as the sensitivity of the dynamic interactions to the relative delay time between the signal light and pump pulse, play crucial roles in this optical diode system. Based on these findings, a high contrast (over 22 dB) and high unidirectional transmission rate (over 70%) optical diode is achieved. More importantly, the conducting direction of the optical diode can be controllably reversed, without the need of changing the signal's wavelength or power as usually done. This approach is promising in the fields of optical information processing and quantum computing.