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ABSTRACT: We report the experimental observation of enhanced rotation sensing in a slow-light structure. We demonstrate that the differential of the phase difference, introduced by rotation, between the counterpropagating waves is proportional to the group index, and thus we can obtain large rotation sensitivity in the slow-light structure with high dispersion (large group index). The results also predict the realization of highly sensitive and compact integrated rotation sensors and gyroscopes by using microwaveguides.
Optics Letters 03/2010; 35(5):691-3. · 3.40 Impact Factor
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ABSTRACT: We report the investigation of the reduction of the group velocity propagation resulting from the steep change of the refractive index by the coherent population oscillation in an erbium ion-doped optical fiber. We study fully the influences of the ion density and the temperature on the fractional and time delay. We find that the fractional delay can be decreased at high or low temperature. Moreover, we conclude that the temperature can be used as a control parameter to reduce distortion.
Applied Optics 05/2008; 47(11):1781-4. · 1.41 Impact Factor
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ABSTRACT: In order to control group velocity, an annular chain of microring coupled-resonator optical waveguides was analyzed, and its
transmission spectra were obtained using the transfer matrix method. The result showed that the curvature of the chain caused
the dispersion curves to shift and the resonance frequency got fixed. It is therefore concluded that the group velocity of
light in the annular chain of microring coupled-resonator optical waveguides can be controlled by adjusting the curvature
of the chain. We believe that such an annular chain can be used as an optical buffer or signal retarder for optical communication.
Chinese Science Bulletin 10/2007; 52(22):3047-3050. · 1.32 Impact Factor
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ABSTRACT: In this paper, the authors demonstrated that the observation of ultra-slow group velocity and spectral holes by CPO in erbium-doped fiber at a room temperature. Operation of the reduction of light propagation at 1550 nm showed that the variable optical delay in fiber system could be applied to telecommunication system.
Lasers and Electro-Optics - Pacific Rim, 2007. CLEO/Pacific Rim 2007. Conference on; 09/2007
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ABSTRACT: We investigated the variations of group velocity slowdown in high doped erbium fibers. From the model the group velocity slowdown is controlled obviously by changing erbium ion population of ground state. To validate the effect of ion population for slow light, we did experimental measurement using high-doped erbium fibers.
08/2007;
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ABSTRACT: The authors observed the superluminal propagation at negative group velocity in C60 toluene solution firstly. The theoretical analysis was made based on density matrix model of superluminal propagation. The simulation result was well consistent with experimental measurement. The largest time advancement of 3.58 ms was got at 5.6×10−4 mol/l of sample concentration; the corresponding group velocity is −0.28 m/s.
Applied Physics Letters 03/2007; 90(12):121107-121107-3. · 3.84 Impact Factor
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ABSTRACT: The authors experimentally observed the superluminal propagation at negative group velocity in C60 polymethyl methacrylate (PMMA) firstly. The largest time advancement of 7.61 ms was obtained at 1 mg/cm3 of sample concentration, the corresponding group velocity was −0.657 m/s. Fast light in C60 PMMA offers several advantages over liquids or vapors for a variety of possible applications: (i) easy for experimental measurement and practical applications (ii) easy for manufacture, (iii) sample concentration is another convenient parameter to vary the signal delay.
Optik - International Journal for Light and Electron Optics.
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ABSTRACT: We designed ring-in-ring planar resonator which is coupled with a straight waveguide to yield coupled-resonator-induced transparency (CRIT). The model shows an obvious effect which has a direct analogy with the phenomenon of the electromagnetically induced transparency in quantum systems. Based on this structure, a high sensitive optical gyroscope for measuring absolute rotation is proposed and analyzed. Its sensitivity scales directly with the group index whose can be reached to 102–104 orders of magnitude by using proper parameters.
Physics Letters A.
