Topic
Extinction ratio
About: Extinction ratio is a research topic. Over the lifetime, 8541 publications have been published within this topic receiving 111908 citations.
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TL;DR: It is shown through experiments and simulations how the interplay between electrical, optical, and light-induced thermal forces can reversibly relocate a few atoms and enable atomic photodetection with a digital electronic response, a high resistance extinction ratio, and a low OFF-state current at room temperature.
Abstract: The optical control of atomic relocations in a metallic quantum point contact is of great interest because it addresses the fundamental limit of “CMOS scaling”. Here, by developing a platform for combined electronics and photonics on the atomic scale, we demonstrate an optically controlled electronic switch based on the relocation of atoms. It is shown through experiments and simulations how the interplay between electrical, optical, and light-induced thermal forces can reversibly relocate a few atoms and enable atomic photodetection with a digital electronic response, a high resistance extinction ratio (70 dB), and a low OFF-state current (10 pA) at room temperature. Additionally, the device introduced here displays an optically induced pinched hysteretic current (optical memristor). The photodetector has been tested in an experiment with real optical data at 0.5 Gbit/s, from which an eye diagram visualizing millions of detection cycles could be produced. This demonstrates the durability of the realized ...
40 citations
TL;DR: In this paper, a novel four-port optical switch is proposed and designed using a two-dimensional photonic crystal platform, which is composed of waveguides and ring resonator in a square lattice with gallium phosphide rods arranged in an air medium.
Abstract: In recent trend, the ultra-speed nanophotonics components are highly attractive for the scientific community and next-generation high-speed optical communication systems. In this present work, a novel four-port optical switch is proposed and designed using a two-dimensional photonic crystal platform. The proposed device is composed of waveguides and ring resonator in a square lattice with gallium phosphide rods arranged in an air medium. The plane wave expansion (PWE) method is used to identify the operating wavelength of the proposed device. The functional parameters of the optical switch such as normalized output power, bit rate, response time, extinction ratio, insertion loss, and crosstalk are analyzed using the finite-difference-time-domain method (FDTD). The presented platform is designed with the ultra-fast data rate of 6.52 Tbps, very low crosstalk of − 40.45 dB, and fast response time of 153.33 femtoseconds. Hence, it is tremendously suitable for high speed photonic integrated circuits and switching application.
40 citations
TL;DR: The experimental transmission over 50-km standard fiber of a 10-Gb/s payload data multiplexed with a synchronized 1.25-Gb/, carried out with less than 1-dB receiver power penalty, clearly demonstrating the feasibility of this sideband optical labeling scheme.
Abstract: We report on a new approach to all-optical subcarrier labeling based on sideband generation through carrier-suppression of the payload. The experimental transmission over 50-km standard fiber of a 10-Gb/s payload data multiplexed with a synchronized 1.25-Gb/s subcarrier label is carried out with less than 1-dB receiver power penalty, clearly demonstrating the feasibility of this sideband optical labeling scheme. The requirements to the modulation index and dc bias along with the limitation of the input extinction ratio are discussed.
40 citations
TL;DR: This work shows, for the first time, dense WDM (8×20 Gbit/s) transmission at 2 μm enabled by advanced modulation formats (4-ASK Fast-OFDM) and the development of key components, including a new arrayed waveguide grating (AWGr) at 2-μm.
Abstract: We show, for the first time, dense WDM (8×20 Gbit/s) transmission at 2 μm enabled by advanced modulation formats (4-ASK Fast-OFDM) and the development of key components, including a new arrayed waveguide grating (AWGr) at 2 μm. The AWGr shows -12.8±1.78 dB of excess loss with an 18-dB extinction ratio and a thermal tunability of 0.108 nm/°C.
40 citations
TL;DR: In this article, a few-layer, asymmetric light transmitting metasurface that simultaneously satisfies all the above requirements is reported, which has a measured transmission efficiency of 80%, extinction ratio of 13.8 dB around 1.5 μm, and a full width half maximum bandwidth of 1.7 μm.
Abstract: High efficiency, broad bandwidth, and robust angular tolerance are key considerations in photonic device design. Here, a few-layer, asymmetric light transmitting metasurface that simultaneously satisfies all the above requirements is reported. The metasurface consists of coupled metallic sheets. It has a measured transmission efficiency of 80%, extinction ratio of 13.8 dB around 1.5 μm, and a full width half maximum bandwidth of 1.7 μm. It is as thin as 290 nm, has good performance tolerance against the angle of incidence and constituent nano-structure geometry variations. This work demonstrates a practical asymmetric light transmission device with optimal performance for large scale manufacturing.
40 citations