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IEEE Journal of Quantum Electronics

Ultrafast, Compact, and Energy Efficient All-Optical Switches Based on a Saturable Absorbing Cavity

Ping Ma, Heinz Jäckel, G.L. Bona, Christian Haffner

Published Oct 31, 2014• 10 citations
Publisher

Abstract

In this paper, we propose and theoretically investigate an ultrafast, compact, and energy efficient all-optical switch (AOS) design based on a saturable absorbing cavity. The conceptual basis of the switch design is the material absorption saturation phenomenon. The optical cavity is used to enhance the light-matter interaction locally. As a result, the device dimension is substantially reduced. Numerical studies were carried out analytically using the temporal-coupled mode theory. Cavity structural parameters and material properties related to the switch design are discussed. The figure of merit of the switch performance in terms of the insertion loss, extinction ratio, and operating energy consumption are analyzed. Finally, as a specific practical application of the developed AOS, ultrahigh-speed optical time division multiplexing operations are demonstrated.

DOI
10.1109/jqe.2014.2365995

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In this paper, we propose and theoretically investigate an ultrafast, compact, and energy efficient all-optical switch (AOS) design based on a saturable absorbing cavity. The conceptual basis of the switch design is the material absorption saturation phenomenon. The optical cavity is used to enhance the light-matter interaction locally. As a result, the device dimension is substantially reduced. Numerical studies were carried out analytically using the temporal-coupled mode theory. Cavity structural parameters and material properties related to the switch design are discussed. The figure of merit of the switch performance in terms of the insertion loss, extinction ratio, and operating energy consumption are analyzed. Finally, as a specific practical application of the developed AOS, ultrahigh-speed optical time division multiplexing operations are demonstrated.
Achieving low power consumption and ultrafast response simultaneously remains a major challenge in all-optical switching technology. In this work, we propose and theoretically demonstrate a novel all-optical switch based on a passive white-light coupled ring resonator. Unlike conventional white-light cavity schemes that rely on negative-dispersion media and external pump fields, the proposed design exploits passive coupling and cavity-phase engineering to induce broadband resonance and effective phase compensation. This enables all-optical switching with significantly reduced threshold power and shortened response time, while maintaining structural simplicity and operational stability. Compared with classical white-light cavity switches, the passive design not only eliminates the demand to fill negative dispersion media but also offers enhanced robustness and feasibility for photonic integration. The proposed architecture provides a promising route toward high-performance all-optical computing and optical communication systems.
Summary form only given. We have realized an ultrafast saturable absorber by implantation of energetic ions in an InGaAs-InAlAs multiple quantum well structure. This constitutes an efficient way for introducing a controllable concentration of efficient traps, in order to control the carrier lifetime while preserving the excitonic properties of the quantum wells. A further advantage of this approach is that the ion implantation can be realized as one of the very last steps in the fabrication process. The integration of this tailored nonlinear material in guided-wave or optical microcavity devices should result in high-speed, compact, all optical switches, with low switching energies. Modeling of such devices based on the present experimental results will be discussed.
Optical switching remains a key outstanding challenge for scalable photonic quantum computing due to the trade-off between speed, bandwidth, and loss. Quantum photonics demands all three to enable high computational clock rates and resource-efficient scaling to large systems. We present a cavity-based optical switch that overcomes this limitation, demonstrating a rise time of 22 ns, an insertion loss of 2.4 dB, and an extinction ratio of 17.5, which bridges the gap between speed and efficiency in photonic switching. All-optical control is achieved via phase modulation of a signal field detuned from the near-degenerate two-photon absorption ladder in warm rubidium vapor. The ultimate performance of our switch will find applications in active multiplexing, loop-based quantum memory, and feed-forward for quantum error-correction protocols.
One of the major challenges in realizing practical all-optical switching devices is the need for strong and fast material nonlinearity. The use of resonance-enhanced nonlinear effects in optical cavities has been explored as a promising way to lower the switching power. This paper provides numerically investigation of resonator-enhanced Mach-Zehnder interferometer all-optical switch by employing a nonlinear ratio-variable coupler with the merits of easy fabrication and excellent nonlinear optical controllability. This performs nonlinear optical switching with advantages of hundreds tW low switching threshold, steady switch ON/OFF states and a wide wavelength range by combining the high nonlinearity of ring and adjustable coupling ratio of RVC. Resonator finesse is controllable by incident power with potential applications in controllable photonic devices. Some undesirable effects involving attenuation, group delay and partial coherence lead to increase of switching power and low extinction ratio. Optical bistability and instability do not limit practical applications in optical switch. A desired tradeoff between response time and switching power can be achieved by controlling finesse. Picosecond ultrafast all-optical switch is predicted.
Ultrafast optical switches are one of the crucial components in next generation all-optical communication networks. One promising candidate is the optical switch based on saturable intersubband (ISB) absorption in doped InGaAs/AlAs/AlAsSb coupled double quantum wells (CDQW). We employ the density matrix theory and modified optical Bloch equations with the relaxation-time approximation to simulate the time evolution of optical nonlinearities in quantum well (QW) structures. The absorption saturation characteristics are derived afterwards. The theoretical estimates are used to interpret the corresponding experimental results. Furthermore, several impact factors related to dynamic and saturation characteristics of the materials are discussed theoretically. The studies provide useful clues to optimize the QW material and device design.
Abstract We provide an approach to realize an optical switch using an induced transparency phenomenon in double-cavity structures. Our system consists of two directly coupled cavities, each coupled to a different waveguide. The system is pumped by a control field and a signal field propagating in the waveguides. We analyze the excitation spectra of the cavities, as well as corresponding transmission and reflection coefficients for the signal field. We find that induced transparency or an absorption phenomenon for the signal field can be established in this system, depending on the parameters of the control field. Thus, the transport properties for the signal field are highly controllable. Under appropriate parameters the system can behave as a nearly perfect optical switch for the signal field. The influence of dissipations on the efficiency of the switch is also discussed. The device studied here is suitable for on-chip integrations, and may have broad applications in future quantum networks.