Extended lattice filters enabled by four-directional couplers

MacFarlane, Duncan L.; Jian, Tong; Fafadia, Chintan; Govindan, Vishnupriya; Hunt, L. R.; Panahi, Issa

doi:10.1364/ao.43.006124

Cited by 14 publications

(10 citation statements)

References 15 publications

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“…The four-port couplers simulated here are symmetric and without loss, yielding three conditions for energy conservation, based on equal magnitudes of total incident time-average Poynting vectors and total reflected and transmitted time-average Poynting vectors [15,23]:

α^{2} + β^{2} + ρ^{2} + τ^{2} = 1

2 α β + 2 ρ τ = 0

τ (α + β) + ρ (α + β) = 0

…”

Section: Resultsmentioning

confidence: 99%

“…The 2 × 2 four-port coupler may support up to four input signals and produce four output signals for each input. At each coupler port, there is a reflected component, ρ , a transmitted component, τ , a right-directed component, α , and a left-directed component, β [15]. The varied manner in which these couplers may be arranged, yields very rich optical characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Active Integrated Filters for RF-Photonic Channelizers

Nagdi

Liu

LaFave

et al. 2011

Sensors

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A theoretical study of RF-photonic channelizers using four architectures formed by active integrated filters with tunable gains is presented. The integrated filters are enabled by two- and four-port nano-photonic couplers (NPCs). Lossless and three individual manufacturing cases with high transmission, high reflection, and symmetric couplers are assumed in the work. NPCs behavior is dependent upon the phenomenon of frustrated total internal reflection. Experimentally, photonic channelizers are fabricated in one single semiconductor chip on multi-quantum well epitaxial InP wafers using conventional microelectronics processing techniques. A state space modeling approach is used to derive the transfer functions and analyze the stability of these filters. The ability of adapting using the gains is demonstrated. Our simulation results indicate that the characteristic bandpass and notch filter responses of each structure are the basis of channelizer architectures, and optical gain may be used to adjust filter parameters to obtain a desired frequency magnitude response, especially in the range of 1–5 GHz for the chip with a coupler separation of ∼9 mm. Preliminarily, the measurement of spectral response shows enhancement of quality factor by using higher optical gains. The present compact active filters on an InP-based integrated photonic circuit hold the potential for a variety of channelizer applications. Compared to a pure RF channelizer, photonic channelizers may perform both channelization and down-conversion in an optical domain.

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α^{2} + β^{2} + ρ^{2} + τ^{2} = 1

2 α β + 2 ρ τ = 0

τ (α + β) + ρ (α + β) = 0

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Active Integrated Filters for RF-Photonic Channelizers

Nagdi

Liu

LaFave

et al. 2011

Sensors

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“…This range will be bounded on one end by the noise figure and stability on the other. In addition, theoretical and experimental work is also underway in two-dimensional active lattice filters based on four-directional couplers [14]. …”

Section: Conclusion and Future Researchmentioning

confidence: 99%

Active Optical Lattice Filters

Hunt

Govindan

Panahi

et al. 2005

EURASIP J. Adv. Signal Process.

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Optical lattice filter structures including gains are introduced and analyzed. The photonic realization of the active, adaptive lattice filter is described. The algorithms which map between gains space and filter coefficients space are presented and studied. The sensitivities of filter parameters with respect to gains are derived and calculated. An example which is relevant to adaptive signal processing is also provided

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“…The resultant barrier allows a precise splitting of the incident mode into two continuing waveguides without perturbing the mode shape and suffering the associated loss. The design was a simple building block for a channelizer architecture [2][3][4]. The characteristic bandpass and notch filter responses of the outputs are the basis of a channelizer architecture.…”

Section: Introductionmentioning

confidence: 99%

Active Lattice Filter with nanophotonic FTIR-couplers for integrated photonic channelizer

Christensen

MacFarlane

Hunt

et al. 2010

2010 Photonics Global Conference

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A 2D Active Lattice Filter ALF combining a Manhattan grid of waveguide gain segments with nanophotonic couplers at the waveguide intersections is presented. The particular application reported herein is a basic channelizer. The resulting structure is readily described, designed, and analyzed in Z-transform space. Critical to the implementation of the 2D ALF circuit is a highly efficient small footprint coupler based on frustrated total internal reflection (FTIR). 1

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Extended lattice filters enabled by four-directional couplers

Cited by 14 publications

References 15 publications

Active Integrated Filters for RF-Photonic Channelizers

Active Integrated Filters for RF-Photonic Channelizers

Active Optical Lattice Filters

Active Lattice Filter with nanophotonic FTIR-couplers for integrated photonic channelizer

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