Journal ArticleDOI
On the radiation mode effects in integrated optical directional couplers
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TLDR
In this paper, the effect of radiation modes generated at the input of a directional coupler on its performance was studied using the Beam Propagation Method (BPM) for numerical simulation.Abstract:
In this work we study the effect of radiation modes generated at the input of a directional coupler on its performance. We focus on the splitting ratio and the coupling length of the coupler. The Beam Propagation Method (BPM) is used for numerical simulation. Numerical results are compared to analytical expectations of the coupled mode theory (CMT). We show that, when the coupler is excited by a single mode fibre, ideal 3 dB couplers could be obtained by a simple adjustment of the exciting fibre. On the other hand, when the coupler has input and output bend structures, its coupling length as well as its splitting ratio are affected by the geometry of this bend.read more
Citations
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Journal ArticleDOI
Quantitative modeling of coupling-induced resonance frequency shift in microring resonators.
TL;DR: A model for the phase responses of the coupling structure is presented and verified to agree with the simulation results well, in which the first-order coupled mode theory (CMT) is extended to second order, and the important contributions from the inevitable bent part of practical resonators are included.
Journal ArticleDOI
A MEMS Tunable Optical Ring Resonator Filter
Tarek Mamdouh,Diaa Khalil +1 more
TL;DR: In this paper, a new architecture for a ring resonator tunable optical filter is proposed, where two rings are connected to each other by a directional coupler and tuning is achieved through the control of the separation between the coupler two parallel guides using a micro-electro-mechanical systems actuator.
Journal ArticleDOI
Box-like filter response using multimode single-ring microresonators
TL;DR: A new technique to form a box-like filter response using a single microring resonator based on exploiting the multimode propagation in the ring is suggested, which opens the door for more compact optical filters with controlled box- like response.
References
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Journal ArticleDOI
Light propagation in graded-index optical fibers
Michael D. Feit,J. A. Fleck +1 more
TL;DR: An accurate numerical method is described for solving the Helmholtz equation for a general class of optical fibers and yields detailed information about the spatial and angular properties of the propagating beam as well as the modal propagation constants for the fiber.
Journal ArticleDOI
Loss calculation and design of arbitrarily curved integrated-optic waveguides
Roel Baets,Paul Lagasse +1 more
TL;DR: In this article, the radiation losses in arbitrarily curved integrated-optic waveguides are computed numerically by means of the beam-propagation method, and design rules for bends and S-shaped curves connecting two straight waveguiders are derived.
Journal ArticleDOI
A new general approach to optical waveguide path design
François Ladouceur,E. Labeye +1 more
TL;DR: An adapted pure bend loss reduction mechanism that relies on a continuous widening of the waveguide together with the reduction of transition loss through curvature adaptation to improve the loss figures and ease the burden of waveguide path design is proposed.
Journal ArticleDOI
An exact simplified method for the normalization of radiation modes in planar multilayer structures
TL;DR: In this paper, an exact simplified method for the power normalization of the radiation modes in planar multilayer or graded index structures is presented, based on the physical understanding of the radii as a superposition of plane waves.
Journal ArticleDOI
Towards a full vectorial and modal technique for the analysis of integrated optics structures: the Radiation Spectrum Method (RSM)
TL;DR: The radiation spectrum method (RSM) as discussed by the authors is based on the analysis of the radiation mode spectrum generated at each waveguide discontinuity in the structure, which can be used for non-paraxial tests such as tilted waveguide and bent waveguide tests.