Coupler-apodized Bragg-grating add–drop filter

Shi, Wei; Yun, Han; Lin, Cheng-Ju; Flueckiger, Jonas; Jaeger, Nicolas A. F.; Chrostowski, Lukas

doi:10.1364/ol.38.003068

Cited by 39 publications

(13 citation statements)

References 12 publications

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“…To overcome this issue, we recently proposed using a tapered coupler gap to implement apodization in contra-DCs. 29 Because the feature size of the coupler gap (in the range of 100 nm to 1 µm) is usually larger than the waveguide perturbations, this coupler apodization method enables a higher tolerance to fabrication errors. By keeping the perturbation amplitude constant, the lithography effects are constant throughout the apodization profile, leading to higher reliability.…”

Section: Coupler-apodized Bragg Add-drop Filtersmentioning

confidence: 99%

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Silicon photonic Bragg-grating couplers for optical communications

et al. 2014

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We discuss recent progress and challenges in realizing Bragg-grating devices on the submicron silicon-on-insulator platform for next-generation optical communications applications, such as on-chip optical interconnects and signal processing. In particular, we focus on grating-assisted, wavelength-selective couplers, known as contra-directional couplers (contra-DCs). In contrast to conventional two-port Bragg gratings operating in the reflection mode, contra-DCs are four-port devices with very weak backreflections and, therefore, can be easily integrated with other photonic components on a chip. In order to provide a reliable on-chip wavelength-division multiplexing (WDM) solution for high-speed optical interconnects, we have developed high-performance add-drop filters and, furthermore, wavelength multiplexers/demultiplexers with combined advantages of flat-top responses, low insertion loss (< 1 dB), and low crosstalk (< -23 dB). These WDM devices are ultra-compact and highly tolerant to temperature fluctuations (up to ± 50 0 C), showing great potential for large-scale integration and low-power consumption. We further discuss a novel four-port Bragg photonic resonator for high-speed, low-power optical switching. Using a coupler-chirped design with uniform Bragg gratings, we have recently achieved an on-chip, continuously tunable photonic delay line with low insertion loss. These system-orientated devices indicate great potential for large-scale integration of Bragg-grating-defined functions using CMOS-compatible silicon photonics technology.

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Section: Coupler-apodized Bragg Add-drop Filtersmentioning

confidence: 99%

“…This uniform grating design ensures that lithographic effects are constant throughout the coupler, and thus can be more precisely predicted. 29 As the waveguides become narrower along the length of the coupler, the local phase-match condition (Eq. 1) shifts to shorter wavelengths.…”

Section: Integrated Tunable Optical Delay Linesmentioning

confidence: 99%

Silicon photonic Bragg-grating couplers for optical communications

et al. 2014

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“…While discrete delay tuning can be obtained by stepped pitch variation [10], it is easier to taper waveguide widths for continuous tuning [7]. The use of uniform gratings ensures that lithography effects are constant throughout the coupler, and thus can be more precisely predicted [13].…”

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confidence: 99%

“…This slab-modulated structure [14] enables flexible apodization or chirping designs by shaping the waveguide geometry without fine tuning small perturbation features, producing a design with high reliability. Based on this scheme, a novel coupler-apodized Bragg grating add-drop filter was demonstrated using 193 nm lithography, showing high sidelobe suppression of 30 dB [13]. Here, we keep the grating uniform (i.e., both the size and pitch of the perturbations are constant throughout the entire coupler), and taper the waveguides for index chirping.…”

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Tunable nanophotonic delay lines using linearly chirped contradirectional couplers with uniform Bragg gratings

et al. 2014

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We demonstrate an integrated tunable optical delay line in grating-assisted contradirectional couplers using a CMOS-compatible photonic technology. The input signal is delayed through dispersive Bragg gratings and distributedly coupled to the drop port of the coupler without backreflections. This add-drop design enables monolithic integration of grating-based delay lines without using optical circulators. The gratings are formed by slab perturbations in rib waveguides, with the index chirping realized by linearly tapering the rib widths. Both the pitch and size of the gratings are constant through the entire coupler, for a higher tolerance to fabrication errors. Continuous tuning of the optical group delay of up to 96 ps has been obtained, with a low insertion loss of less than 2 dB and a negative chromatic dispersion of -11 ps/nm that allows for bit rates of up to almost 100 Gb/s at the maximal delay. The device has a small footprint of 0.015 mm2, and can be used for on-chip optical buffering, dispersion compensation, and pulse compression.

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“…As this material system has a very high refractive index contrast, the difficulty is to obtain sufficient control over the fabrication technology to cause a very small effective refractive index variation with the required accuracy. As gratings offer many possibilities [6], [7], we propose to implement these weak gratings by modulating the shallow etched sides of a ridge waveguide [8].…”

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Design of Weak 1-D Bragg Grating Filters in SOI Waveguides Using Volume Holography Techniques

Verbist

Bogaerts

Thourhout

2014

J. Lightwave Technol.

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Abstract-To answer the growing need for more versatile integrated spectral filters, we show that weak one-dimensional gratings can be designed towards any desired target spectrum. We follow a very straightforward design procedure to demonstrate the performance of these devices. Measurements and simulations show a very good correspondence with the target spectra. By analyzing the results, we also found that the design procedure can be refined by using simulated reflections, instead of relying on the calculated Fresnel reflections.

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Coupler-apodized Bragg-grating add–drop filter

Cited by 39 publications

References 12 publications

Silicon photonic Bragg-grating couplers for optical communications

Silicon photonic Bragg-grating couplers for optical communications

Tunable nanophotonic delay lines using linearly chirped contradirectional couplers with uniform Bragg gratings

Design of Weak 1-D Bragg Grating Filters in SOI Waveguides Using Volume Holography Techniques

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