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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 article, an almost singlemode waveguiding layer has been fabricated by thermal diffusion of TiO2 into LiNbO3, and an amplitude modulation has been made with a stripe waveguide 10 μm wide and planar electrodes.
Abstract: An almost single‐mode waveguiding layer has been fabricated by thermal diffusion of TiO2 into LiNbO3. The refractive‐index change in the layer is 2–3×10−3 for both ne and no, and the propagation loss is 0.7–0.8 dB/cm. The electro‐optic coefficients are found to be nearly equal to those of the bulk crystal. An amplitude modulation has been made with a stripe waveguide 10 μm wide and planar electrodes. The half‐wave voltage is 17 V and the maximum extinction ratio is 12 dB.

57 citations

Journal ArticleDOI
TL;DR: In this paper, a three-dimensional high-dimensional self-aligned assembly using stripe-type Au-Sn solder bumps and a micro-press solder bump formation method was developed for optical device assembly in both lateral and vertical directions.
Abstract: We have developed a novel three-dimensional high precision self-aligned assembly using stripe-type Au-Sn solder bumps and a micro-press solder bump formation method. This produces a high bonding precision of 1 /spl mu/m for optical device assembly in both lateral and vertical directions without the need for time-consuming optical axes alignment. Furthermore, we tested a hybrid integrated 4/spl times/4 optical matrix switch, in which multiple SSC-SOAG arrays were simultaneously positioned and optical fibers were passively positioned on a silica based PLC platform using this technology. Four optical chips and seven wiring chips are assembled on a planar lightwave circuit (PLC) platform. The insertion loss for each of these paths at an injection current of 40 mA was within a range of 9/spl plusmn/4 dB. The average extinction ratio was 40 dB. This self-aligned assembly technology was shown to be useful for building hybrid-integrated multichannel optical network components.

57 citations

Journal ArticleDOI
TL;DR: Using a simple multiwavelength Raman laser configuration with a single phase-shifted FBG and a tunable chirped FBG, this work readily achieved simultaneous two-channel sensing probes with a high extinction ratio over a 50-km distance.
Abstract: We propose a simple and flexible multiwavelength Raman fiber laser based on phase-shifted fiber Bragg gratings (FBGs) and a tunable chirped FBG Using a simple multiwavelength Raman laser configuration with a single phase-shifted FBG and a tunable chirped FBG, we readily achieved simultaneous two-channel sensing probes with a high extinction ratio of more than 50 dB over a 50-km distance The multiwavelength output was stable and the peak fluctuation was less than 05 dB The temperature and strain sensitivities are estimated to be 101 pm/degrees C and 75 pm/microstrain, respectively

57 citations

Journal ArticleDOI
TL;DR: Design and simulation results are presented for an ultralow switching energy, resonator based, silicon-on-insulator (SOI) electro-optical modulator that allows for a 6 dB extinction ratio at telecom wavelengths with an energy cost as low as 14 attojoules/bit.
Abstract: Design and simulation results are presented for an ultralow switching energy, resonator based, silicon-on-insulator (SOI) electro-optical modulator. The nanowire waveguide and Q ~8500 resonator are seamlessly integrated via a high-transmission tapered 1D photonic crystal cavity waveguide structure. A lateral p-n junction of modulation length Lm ~λ is used to alter the index of refraction and, therefore, shift the resonance wavelength via fast carrier depletion. Differential signaling of the device with ΔV ~0.6 Volts allows for a 6dB extinction ratio at telecom wavelengths with an energy cost as low as 14 attojoules/bit.

57 citations

Journal ArticleDOI
TL;DR: In this article, the magneto-optical enhancement mechanisms in this magnetoplasmonic structure, achieving broadband near-perfect orthogonal linear polarization conversion modulated by the weak magnetic field in an experiment with an extinction ratio of 33.dB.
Abstract: The nonreciprocal circular dichroism and Faraday rotation effect for terahertz (THz) waves in longitudinally magnetized InSb were investigated by theoretical and experimental studies in the THz regime, which indicated its ability for a THz circularly polarized isolator, THz circular polarizer, tunable polarization converter, and polarization modulator by manipulation of different magnetic fields. Furthermore, we demonstrated the InSb plasmonics based on its magneto-optical effects combined with artificial microstructure. We found the magneto-optical enhancement mechanisms in this magneto-plasmonic structure, achieving broadband near-perfect orthogonal linear polarization conversion modulated by the weak magnetic field in an experiment with an extinction ratio of 33 dB. Moreover, the magneto-optical modulation with an amplitude modulation depth of 95.8% can be achieved by this device under a weak magnetic field of 150 mT. InSb and its magneto-plasmonic device have broad potential for a THz isolator, magneto-optical modulator, and polarization convertor in THz application systems.

56 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023187
2022429
2021371
2020449
2019468
2018441