Article

# Direct measurement of tunable optical delays on chip analogue to electromagnetically induced transparency

Cornell University, Итак, New York, United States
(Impact Factor: 3.49). 08/2006; 14(14):6463-8. DOI: 10.1364/OE.14.006463
Source: PubMed

ABSTRACT

Direct time-domain measurement of tunable optical delay in a silicon resonating structure is presented. The structure is composed by a double-ring resonator, whose spectrum has a narrow transparency peak with low group velocity analogous to that in electromagnetically induced transparency. Effective group indices from 90 to 290 are obtained by tuning the resonator thermally. The measurements agree well with the theoretical analysis.

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Available from: cornell.edu
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• "The transmission thus shows a dip with full-width-halfmaximum (FWHM) of 0.022 nm, corresponding to a quality factor of Q = 72 000. The transmission spectrum of the device shows a peak at the resonant wavelength of the FP-like mode (λ FP ), which is in contrast to ordinary FP cavities because the fourth-ring resonator is still a travelling wave cavity with no back reflection into the input waveguide at any wavelength [2] [16] [17]. "
##### Article: Induced-transparency in silicon-on-insulator based novel resonator systems
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ABSTRACT: The coupled-resonator-induced-transparency (CRIT) phenomenon in a novel optical resonator system is experimentally demonstrated. The system is composed of a four-ring resonator with a 20 μm diameter on silicon, whose spectrum has a narrow transparency peak with low group velocity. The CRIT effect is observed in the optical coupled-resonator because of classical destructive interference. In this reported work, a CRIT resonance with a quality factor of 7.2 × 104 is demonstrated with the same cavity size and the power coupling of the system is 60%, which agree well with the theoretical analysis. Then, through and drop transmission spectra of the resonator coincide well with each other. Simultaneously, the detuning resonant wavelength can be controlled by changing the temperature.
Preview · Article · Oct 2013 · Micro & Nano Letters
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• "Previous approaches for optical TTD include dispersive optical fibers and tunable lasers [2,3], Bragg grating prisms [4] and tunable Bragg gratings [5], but delays were too short for practical systems. CMOS compatible microresonators678 offer compact solutions, modulation and filtering [9], but have relatively narrow bandwidth and high group velocity dispersion [10, 11]. Previous work by the authors has shown novel techniques [12, 13] and initial measurements [14, 15] to overcome these limitations. "
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ABSTRACT: We present results for a broad bandwidth continuously tunable optical delay line based on the balanced side-coupled integrated space sequence of resonators scheme. A tunable delay of up to 345 ps is obtained without distortion of the optical signal. Fast thermal switching speed under 10 $\mu{\rm s}$ is achieved without any measurable long-term transient by utilizing a novel balanced thermal tuning scheme.
Full-text · Article · Mar 2012 · IEEE Photonics Technology Letters
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• "The setup comprising the network analyzer and the detector is used to measure the intensity and temporal responses spectra [11]. Here, both the transmission intensity and the RF phase responses are measured by a network analyzer and the temporal response can be deduced using the following equation: ∆τ= -∆φ/(2πf RF ), where ∆φ is the electrical signal phase difference between the on-resonance and off-resonance wavelengths and f RF is the input radiofrequency (RF) signal frequency. "
##### Conference Paper: Time-domain measurement of feedback-controlled electro-optically tunable time delay and advance in silicon microring resonators
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ABSTRACT: Time-domain measurement of feedback-controlled electro-optically tunable time delay and advance in silicon microring resonators
Full-text · Conference Paper · Sep 2011