Transmission, Group Delay, and Dispersion in Single-Ring Optical Resonators and Add/Drop Filters—A Tutorial Overview

Schwelb, Otto

doi:10.1109/jlt.2004.827666

Cited by 274 publications

(124 citation statements)

References 97 publications

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“…On the other hand, the FWHM bandwidth of the selective filter ∆f is obtained by finding the detuning where the maximum power in (32) decreases to half its value [5]. In deriving the FWHM, the output power is used.…”

Section: A Designing a Selective Filtermentioning

confidence: 99%

Sagnac loop in ring resonators for tunable optical filters

Vázquez

Vargas

Sánchez‐Pena

2005

J. Lightwave Technol.

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Abstract-General filter architecture using co-and counterpropagation signals are studied. A specific configuration based on a Sagnac loop within a ring resonator is analyzed. Novel tuning, apart from conventional tuning, is achieved by changing the coupling ratio of a coupler through the adjustment of the equivalent loop length. Full equations describing the filter behavior in passive and active configurations, and simple closed-form formulas to compute the tuning, tolerance, and full-width at half-maximum are reported. The performance of these devices is discussed for their application as selective or channel-dropping ultra-narrowband filters. The effect of losses and their dispersion properties are also discussed. These devices can be conveniently implemented, using silicon-or InP-integrated optic technology, for they have high free spectral ranges.

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Section: A Designing a Selective Filtermentioning

confidence: 99%

Sagnac loop in ring resonators for tunable optical filters

Vázquez

Vargas

Sánchez‐Pena

2005

J. Lightwave Technol.

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“…Hence, the transfer function of the filter is described by [11], [12] (2) An important parameter that describes the losses in resonators is the quality or factor. The loaded quality factor of a resonator is given by [10], [13] ( 3) where is the intrinsic factor and is the external factor from the resonator-waveguide coupling. In general, since and in (2) are interchangeable, and cannot be uniquely determined from the spectral response of the device.…”

Section: Theorymentioning

confidence: 99%

Soft Lithography Replica Molding of Critically Coupled Polymer Microring Resonators

Poon

Huang

Paloczi

et al. 2004

IEEE Photon. Technol. Lett.

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Abstract-We use soft lithography replica molding to fabricate unclad polystyrene (PS) and clad SU-8 microring resonator filters.The PS resonator has an intrinsic quality factor of 1 0 10 4 at = 1 55 m, while that of the SU-8 resonator is 7100. The extinction ratios of the PS and SU-8 microring filters are 12 and 20 dB, respectively, with net insertion losses of 6.7 and 9.9 dB. The good quality factors and high extinction ratios of the microring resonator filters show the practicality of soft-lithography replica molding for the fabrication of integrated optical devices.

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“…Due to the narrow bandwidth at the resonance wavelengths, MLR also functions as a notch filter (Schwelb, 2004 ). The attenuation at the resonance wavelength can be used to filter out/drop the signal from specific channels in the WDM network by suppressing the signal power.…”

Section: Theorymentioning

confidence: 99%