High-Q channel-dropping filters using ring resonators with integrated SOAs

Rabus, Dominik G.; Hamacher, Michael; Troppenz, U.; Heidrich, H.

doi:10.1109/lpt.2002.802375

Cited by 83 publications

(31 citation statements)

References 8 publications

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“…Ring resonators are more compact than a linear chain of Fabry-Perot resonators and can be fabricated in planar integrated light-wave circuits in a single lithographic step in the case of horizontal coupling. Recently, loss-compensated ring resonators in GaInAsP-InP were reported 50 ; thus a lossless or even an amplifying microring CROW may be feasible. As CROWs are typically narrowband devices, even slight deviations in resonator sizes will alter the passband spectrum in the form of the Vernier effect.…”

Section: Discussionmentioning

confidence: 99%

Designing coupled-resonator optical waveguide delay lines

et al. 2004

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We address the trade-offs among delay, loss, and bandwidth in the design of coupled-resonator optical waveguide (CROW) delay lines. We begin by showing the convergence of the transfer matrix, tight-binding, and time domain formalisms in the theoretical analysis of CROWs. From the analytical formalisms we obtain simple, analytical expressions for the achievable delay, loss, bandwidth, and a figure of merit to be used to compare delay line performance. We compare CROW delay lines composed of ring resonators, toroid resonators, Fabry-Perot resonators, and photonic crystal defect cavities based on recent experimental results reported in the literature.

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Section: Discussionmentioning

confidence: 99%

Designing coupled-resonator optical waveguide delay lines

et al. 2004

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“…These filters can be implemented in optical fiber technology and in silicon-or InPintegrated optic technologies, because photonic circuits with equivalent components have already been developed. Some of them are a monolithically integrated Sagnac interferometer for an all-optical controlled-NOT gate [22], filters using active RRs [23], [24], passive single-and double-RRs [8], [25]- [27] and microcavities [28]. The resonant frequencies of the proposed device can be shifted by changing the equivalent loop length by carrier injection [29] or local heating [30], as in any RR-based device.…”

Section: Introductionmentioning

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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“…Both dielectric and semiconductor rings filters have been realized. In contrast to weakly-guided laterally coupled rings where a typical radius ranges from 300-700 µm [11], [16], vertically coupled architectures are capable of realizing smaller ring radii at the range of 10-20 µm due to the better optical confinement achievable, thus benefiting from a wider free spectral range for minimal signal crosstalk [12]- [14], [18]. Active switching of the optical signals with applied bias has also been achieved using laterally- [19] or vertically coupled [20] structures.…”

Section: Introductionmentioning

confidence: 99%

Fabrication-tolerant active-passive integration scheme for vertically coupled microring resonator

Tee

Williams

Penty

et al. 2006

IEEE J. Select. Topics Quantum Electron.

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Abstract-The large-scale photonic integration of microring resonators in three dimensions made possible by recent developments in vertical coupling and wafer bonding technology is shown to be sensitive to lateral mask misalignment for the ring and bus waveguides introduced during the fabrication process. For a typical 20-µm radius, vertically coupled microring calculations reveal a linear relationship between deviation in the coupling coefficient and lateral misalignment. A coupling coefficient reduction of 50% is predicted for a lateral misalignment of 0.3 µm, which is typical for an alignment accuracy limited by the current state-of-theart mask alignment process. The use of a wide multimode bus waveguide is proposed to ameliorate this alignment sensitivity. The mode-expanded bus waveguide, together with its physically wider structure, reduces the dependence of modal overlap and coupling length on precise alignment, resulting in significantly relaxed fabrication tolerance. Deviation of coupling coefficient decreases by an order of magnitude for the new ring coupler geometry, where a sole reduction of 5% is obtained for the same amount of misalignment. The implications of the proposed structure are subsequently investigated for microring laser performance. The differential slope efficiency is shown to be at least five times less sensitive to lateral misalignment for the proposed structure within a small misalignment regime. This readily adaptable coupler geometry based on existing vertical coupling architectures is transferable to any fabrication scheme with multiple waveguide layers coupled vertically, and is of particular importance to microring resonators with small radii.

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High-Q channel-dropping filters using ring resonators with integrated SOAs

Cited by 83 publications

References 8 publications

Designing coupled-resonator optical waveguide delay lines

Designing coupled-resonator optical waveguide delay lines

Sagnac loop in ring resonators for tunable optical filters

Fabrication-tolerant active-passive integration scheme for vertically coupled microring resonator

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