Topic
Extinction ratio
About: Extinction ratio is a research topic. Over the lifetime, 8541 publications have been published within this topic receiving 111908 citations.
Papers published on a yearly basis
Papers
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TL;DR: It is found that the phase "flip" of the output signal occurs around the largest GER, and adjusting design parameters is shown how to improve GER.
Abstract: We have experimentally achieved a gain extinction ratio (GER) of 30 dB at 21.75 dBm pump power in a dual-pump phase sensitive amplifier based on highly nonlinear fiber, which is more efficient than what we predict with the conventional three-wave model. We point out that high-order sidebands play a key role. Then we scrutinize the trajectories of the output signal vector in the complex plane with increasing nonlinear phase shift and understand the roll-over behavior of GER versus pump power curve. We found that the phase “flip” of the output signal occurs around the largest GER. Adjusting design parameters, we show how to improve GER.
33 citations
TL;DR: In this article, an ultra-compact tunable plasmon ring resonator which is composed of monolayer graphene and a graphene ring was proposed and numerically analyzed.
Abstract: We propose and numerically analyze an ultra-compact tunable plasmon ring resonator which is composed of monolayer graphene and a graphene ring. The results, calculated using the finite element method, reveal that the resonant frequency can be tuned over a wide frequency range by a small change of Fermi level in the graphene ring. Both a high quality factor and extinction ratio of the resonant mode can be achieved when the plasmonic waves in the ring and the input waveguide are properly coupled. As applications, this proposed resonator can be used to construct an ultra-compact fast-tunable filter, modulator, switch or directional coupler in the mid-infrared range.
33 citations
10 Nov 2002
TL;DR: In this article, the first transmission experiment with all-optically labelled packets consisting of ASK modulated payload and orthogonally modulated DPSK label is demonstrated and the limitation of the laser linewidth and the input extinction ratio are discussed.
Abstract: First transmission experiment with all-optically labelled packets consisting of ASK modulated payload and orthogonally modulated DPSK label is demonstrated. The limitation of the laser linewidth and the input extinction ratio are discussed.
33 citations
TL;DR: In this paper, a high performance high speed silicon photonics carrier-depletion Mach-Zehnder modulation with commercial foundry by co-optimization of doping and device design assisted with an accurate electro-optical (EO) model was achieved.
Abstract: We achieved high performance high speed silicon photonics carrier-depletion Mach-Zehnder modulation with commercial foundry by co-optimization of doping and device design assisted with an accurate electro-optical (EO) model. We demonstrated high performance IQ modulators operating at 85 Gbaud 16 QAM and 64 Gbaud 64 QAM with extinction ratio of over 25 dB. For the design of the high performance all-silicon carrier depletion modulator, we developed modeling and design tools to provide not only accuracy, but also efficiency in the simulation of distributed optical and electronic characteristics of travelling waveguides with different designs of optical and microwave waveguides under various doping conditions, which allow the co-design of velocity phase match between optical and microwave waveguides and the impedance match between microwave travelling waveguide and terminal impedance. Our experimental characterization test data agreed well with the model simulation data. More recently, with practical Nyquist filter and linear compensation in commercial arbitrary wave generator (AWG) and optical modulation analyzer (OMA), we demonstrated 100 Gbaud 32 QAM with an all-silicon IQ modulator, which has 6 dB electro-optical bandwidth of 50 GHz and BER achieving FEC threshold with a modern FEC, showing the potential for Tb/s applications.
33 citations
TL;DR: Experimental results and analysis show that leakage of the optical pulses acts as a noise floor, which limits the highest spatial resolution over the same sensing range.
Abstract: The leakage light of optical pulses due to finite extinction ratio (ER) of an electro-optic modulator (EOM) leads to Rayleigh backscattered noises over the entire fiber length, and limits spatial resolution and sensing range in phase-sensitive optical time-domain reflectometry (Φ-OTDR). Two configurations are proposed to improve the ER of optical pulses for better spatial resolution over long sensing length. With ER of 55 dB using a nonlinear optical loop mirror, we achieved 2 m spatial resolution over 8.4 km sensing length; while with ER of 60 dB obtained by two cascaded EOMs, we can achieve a 1 m spatial resolution over the same range. Experimental results and analysis show that leakage of the optical pulses acts as a noise floor, which limits the highest spatial resolution over the same sensing range.
33 citations