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: In this paper, MBE-grown InGaAlAs-InP vertical cavity surface emitting lasers with buried tunnel junction for 1.55 µm wavelength, passivated with benzocyclobutene (BCB) and coplanar contacts, are presented.
Abstract: MBE-grown InGaAlAs-InP vertical cavity surface emitting lasers with buried tunnel junction for 1.55 µm wavelength, passivated with benzocyclobutene (BCB) and coplanar contacts, are presented. The devices show superior modulation bandwidths up to 11.6 GHz. Wide open eye diagrams with 6 dB extinction ratio enable error-free data transmission at 10 Gbit/s in back-to-back configuration and over different fibres.
53 citations
TL;DR: In this article, a novel polarization splitter is proposed for use in integrated optical circuits on lithium niobate, which is based on the mode sorting effect with no external control, while its fabrication requires only a single technology: the diffusion of titanium.
Abstract: A novel polarization splitter is proposed for use in integrated optical circuits on lithium niobate. In contrast to previously reported devices, its operation is based on the mode sorting effect with no external control, while its fabrication requires only a single technology: the diffusion of titanium. The splitter is formed by a Y junction. The polarization splitting can be achieved by making the output waveguides from two titanium strips with different dimensions. A realistic design of these output guides is presented, and some technological aspects are discussed. The operation of the polarization splitter is investigated with the beam propagation method. The results show that a 15-dB extinction ratio is obtained with branching angles larger than 0.2 degrees . The extinction ratio can be as high as 30 dB with a branching angle of 0.1 degrees . The excess losses are below 0.05 dB. >
53 citations
TL;DR: An ultrahigh (>60 dB) extinction ratio is demonstrated in a silicon photonic device consisting of cascaded Mach-Zehnder interferometers, in which additional interferometer function as variable beamsplitters, showing the possibility of integrating and accurately controlling linear-optical components for large-scale quantum information processing and other applications.
Abstract: Imperfections in integrated photonics manufacturing have a detrimental effect on the maximal achievable visibility in interferometric architectures. These limits have profound implications for further photonics technological developments and in particular for quantum photonics technologies. Active optimisation approaches, together with reconfigurable photonics, have been proposed as a solution to overcome this. In this paper, we demonstrate an ultra-high (>60 dB) extinction ratio in a silicon photonic device consisting of cascaded Mach-Zehnder interferometers, in which additional interferometers function as variable beamsplitters. The imperfections of fabricated beamsplitters are compensated using an automated progressive optimization algorithm with no requirement for pre-calibration. This work shows the possibility of integrating and accurately controlling linear-optical components for large-scale quantum information processing and other applications.
53 citations
TL;DR: Air hole 2D photonic crystals (PhC) and air slots have been used in association with semiconductor ridge waveguides to produce highly compact beam-splitters for power or polarization separators and mirrors.
Abstract: Air hole 2D photonic crystals (PhC) and air slots have been used in association with semiconductor ridge waveguides to produce highly compact beam-splitters (less than 10 µm×10 µm) for power or polarization separators and mirrors. An efficiency of 99% (in both 2D and 3D formulations) has been obtained for the power beam-splitter using finitedifference time-domain (FDTD) simulations-and around 95% has been measured experimentally for structures realized in silicon-on-insulator (SOI) waveguides. In the polarization splitter, an extinction ratio as large as 11 dB was also reached experimentally. Examples of combinations of these elements in the form of interferometers are also presented.
53 citations
TL;DR: An EOM with a finite extinction ratio limits the application of Brillouin optical time domain analysis in a distributed BrillouIn-based fiber optic sensor, resulting in confusion in specifying the location of the strained region and in error in detecting the Brillou in frequency and hence in strain and temperature measurement.
Abstract: The effect of the finite extinction ratio of an electro-optic modulator (EOM) on the Brillouin frequency measurement of a distributed Brillouin-based fiber optic sensor is studied. An EOM with a finite extinction ratio limits the application of Brillouin optical time domain analysis in a distributed Brillouin-based fiber optic sensor. This results in confusion in specifying the location of the strained region and in error in detecting the Brillouin frequency and hence in strain and temperature measurement.
53 citations