Broadband Notch Filters Based on Quasi-2-D Photonic Crystal Waveguides for InP-Based Monolithic Photonic-Integrated Circuits

Davanço, Marcelo; Xing, Aimin; Raring, J.W.; Hu, Evelyn L.; Blumenthal, D.J.

doi:10.1109/jstqe.2006.879568

Cited by 11 publications

(8 citation statements)

References 24 publications

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“…In this way, the spectral characteristics of their W3 waveguides improved considerably: An extinction ratio of 30-35 dB was measured 11,12 for the ministop band after the mass transport process compared to extinction ratios of about 20 dB (Ref. 13) without the mass transport process. Since the process yields a more cylindrical hole shape-with a reduced sidewall angle-an improvement of the propagation losses for our W1 PhC waveguides is expected, as well.…”

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confidence: 97%

Record-low propagation losses of 154 dB/cm for substrate-type W1 photonic crystal waveguides by means of hole shape engineering

Kappeler

Kaspar

Jäckel

et al. 2012

Applied Physics Letters

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Large propagation losses in the order 600-1000 dB/cm were reported in the past for planar line-defect photonic crystal waveguides with a weak vertical refractive index contrast (substrate-type). Loss-relevant factors are a well-suited design of the photonic crystal pattern and a high-quality fabrication technology. Here, the focus is on the latter. Two methods—a thermally driven mass transport process and an ultra-slow, selective wet-etching process—are assessed with respect to their capability of enabling low-loss waveguides. With the resulting hole shape, we experimentally demonstrate record-low propagation losses of 154 dB/cm for W1 photonic crystal waveguides in the InP/InGaAsP system.

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confidence: 97%

Record-low propagation losses of 154 dB/cm for substrate-type W1 photonic crystal waveguides by means of hole shape engineering

Kappeler

Kaspar

Jäckel

et al. 2012

Applied Physics Letters

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“…One such interesting property is the so-called mini-stop band (MSB) or mode-gap which originates from energy transfer between forward and backward propagating modes in 2-D PhC waveguides [7,8]. This effect has been investigated not only from a fundamental physics point of view but also for device applications such as coarse wavelength selection [9][10][11] pulse compression [12], selective mirror in photonic crystal laser [13] and fluid sensors [14]. However, the optical characteristics of the MSB have to be significantly improved [15] and new waveguide structures have to be investigated for better performances and new applications.…”

mentioning

confidence: 99%

InP-Based photonic crystal waveguide technology for filtering and sensing applications

Anand

Shahid

Świłło

2011

2011 13th International Conference on Transparent Optical Networks

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EXTENDED ABSTRACTPhotonic crystal (PhC) components in InP-based materials are of practical importance not only for their unique properties but also for integration with conventional optoelectronic components on InP substrate. Several PhC devices in the substrate approach such as filters, lasers, and waveguides have been demonstrated [1,2] and this has been possible due to the development of deep etching of PhCs in InP [3].PhC waveguides have been investigated extensively for their unique waveguiding and dispersive properties [2,[4][5][6]. One such interesting property is the so-called mini-stop band (MSB) or mode-gap which originates from energy transfer between forward and backward propagating modes in 2-D PhC waveguides [7,8]. This effect has been investigated not only from a fundamental physics point of view but also for device applications such as coarse wavelength selection [9][10][11] pulse compression [12], selective mirror in photonic crystal laser [13] and fluid sensors [14]. However, the optical characteristics of the MSB have to be significantly improved [15] and new waveguide structures have to be investigated for better performances and new applications. For example, very sharp edges and high attenuation in the transmission mini-stop band could be attractive for tuneable filters and sensing applications[15,16]. Recently, a new class of photonic crystal components/structures have emerged, namely photonic crystal heterostructures [17]. While most of the work relate to high Q cavities and their applications, single heterojunction PhC waveguides have received much less attention. In multi-mode line defect waveguides the "internal" MSB effect due to mode-coupling could bring a new dimension in single junction heterostructure waveguides, both for fundamental physics and applications.In this work ГK oriented 2D-PhC waveguides (line-defects in a triangular lattice of air-holes) fabricated in InP-based materials are theoretically and experimentally investigated. Specifically we focus on the MSB effect due to the coupling between the first and fifth order modes in PhC waveguides for filter and sensing applications. The investigated waveguides include multi-mode line-defect (three-row missing) waveguides with different waveguide widths and air-fill factors, and, single-junction heterostructure waveguides. A central issue in the low-index system is the requirement of high aspect ratio etching. The quality of the etched PhC holes (shape, uniformity and depth) has a direct bearing on the optical properties of the waveguides. Here we present the stateof-the-art high aspect ratio etching of InP-PhCs highlighting the fundamental limits and how they can be overcome. Near cylindrical hole shapes together with a dramatic improvement in the hole to hole depth uniformity and reduction in shape irregularities are demonstrated. These excellent geometrical characteristics of the etched PhC result in waveguides with superior performances. In particular extremely sharp MSB edges are obtained. MSB as deep as 35 dB and with shar...

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“…5-10 Transmission spectra of MSB have been measured by internal light source technique for waveguides in GaAs and InPbased PC heterostructures which correspond to weak index confinement structures in the vertical direction. 5,6,11 Because mode coupling is the basic mechanism for many functional PCWGs devices, such as filters, splitters, switches, etc., the mode coupling in just one PCWG provides a simple platform for compact device. Thus, many promising applications based on MSB have been proposed, such as optical gain enhancement, 7,12 slow light, 13 fluid sensor, 14 mode selective mirror, 9 and spectral filter.…”

mentioning

confidence: 99%

“…Thus, many promising applications based on MSB have been proposed, such as optical gain enhancement, 7,12 slow light, 13 fluid sensor, 14 mode selective mirror, 9 and spectral filter. 10,11 However, MSB is generally formed in multimode PCWGs 5,6,11,13 and the interaction of these multimodes will degrade the transmission performance. 15 Additionally, effective adjustment of MSB is not feasible.…”

mentioning

confidence: 99%

“…Here, W3 PCWG was selected to induce the double slots, because MSB in W3 PCWG has been extensively studied both in mechanism and experiment. 5,6,11,13 Two slots are symmetrical in the PCWG, where W slot and W 0 represent the width of the slot and the central waveguide, respectively. Silicon on insulator ͑SOI͒ with air bridge structure was used to fabricate the proposed structure.…”

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confidence: 99%

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Temperature dependence of ministop band in double-slots photonic crystal waveguides

Cui

Huang

Zhang

et al. 2009

Applied Physics Letters

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We proposed and fabricated a double-slots photonic crystal waveguides (PCWGs) structure formed by introducing two slots into PCWGs with air-bridge structure on silicon-on-insulator substrate. The mode characteristics of double-slots PCWGs were investigated theoretically and experimentally. The transmission spectra present a sharp and deep dip (22 dB with bandwidth of 6 nm) caused by ministop band in the proposed structure, which is 15 dB deeper than that in the W3 PCWG. Additionally, dependence of the dip on temperature in the double-slots PCWG was measured and a temperature coefficient 0.159 nm/°C can be concluded.

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Broadband Notch Filters Based on Quasi-2-D Photonic Crystal Waveguides for InP-Based Monolithic Photonic-Integrated Circuits

Cited by 11 publications

References 24 publications

Record-low propagation losses of 154 dB/cm for substrate-type W1 photonic crystal waveguides by means of hole shape engineering

Record-low propagation losses of 154 dB/cm for substrate-type W1 photonic crystal waveguides by means of hole shape engineering

InP-Based photonic crystal waveguide technology for filtering and sensing applications

Temperature dependence of ministop band in double-slots photonic crystal waveguides

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