Ultra-narrowband fiber Bragg gratings for laser linewidth reduction and RF filtering

Poulin, Michel; Painchaud, Yves; Aube, M.; Ayotte, S.; Latrasse, C.; Brochu, Guillaume; Pelletier, F.; Morin, Michel; Guy, M.; Cliche, J. F.

doi:10.1117/12.847174

Cited by 24 publications

(9 citation statements)

References 4 publications

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“…Generally, onchip waveguide losses have limited the grating lengths to less than a few mm, and higher index perturbations to the waveguide were necessary to increase the net reflection. With a low loss waveguide platform, lower coupling constant, kappa ( κ ), values can be utilized to lengthen the grating, thus reducing the linewidth to the performance level of fiber Bragg gratings [6] and lasers utilizing those gratings [7,8]. These narrow bandwidths pave the way for sub-kHz lasing linewidths with monolithically integrated lasers, for instance, by coupling to Si/III-V active devices as previously demonstrated [9].…”

Section: Introductionmentioning

confidence: 99%

Low kappa, narrow bandwidth Si_3N_4 Bragg gratings

Spencer¹,

Davenport²,

Srinivasan³

et al. 2015

Opt. Express

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We investigate three approaches to low perturbation gratings to achieve lower linewidths in filters and semiconductor lasers. The three designs, which are labeled post, sampled, and high order, are DUV lithography compatible and were fabricated on 90 nm thick Si(3)N(4) strip waveguides. Reflection and transmission spectra measurements show coupling constant, kappa, values ranging from 0.23 cm(‑1) to 1.2 cm(‑1) with FWHM values of 74 pm to 116 pm. We discuss the tradeoffs between these geometries in terms of lowest linewidth, apodization, and curved waveguide layout. These results enable long cavity single mode lasers with kHz level linewidths on a monolithic platform.

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Section: Introductionmentioning

confidence: 99%

Low kappa, narrow bandwidth Si_3N_4 Bragg gratings

Spencer¹,

Davenport²,

Srinivasan³

et al. 2015

Opt. Express

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show abstract

“…These gratings are widely used in filters, sensors, and semiconductor lasers as a wavelength selective element, much like the ring resonator. The bandwidth of the grating is directly proportional to power coupling coefficient , and therefore can be minimized by reducing the perturbation strength of the grating [33]. At the same time, the length (L) of the grating should be long enough (L ~ 1) and the loss of the waveguide must be low in order to obtain sufficient reflection.…”

Section: Narrow Bandwidth Bragg Gratingsmentioning

confidence: 99%

Ultra-Low-Loss Silicon Waveguides for Heterogeneously Integrated Silicon/III-V Photonics

Tran¹,

Huang²,

Komljenović³

et al. 2018

Preprint

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Integrated ultra-low-loss waveguides are highly desired for integrated photonics to enable applications that require long delay lines, high-Q resonators, narrow filters, etc. Here we present an ultra-low-loss silicon waveguide on 500 nm thick SOI platform. Meter-scale delay lines, million-Q resonators and tens of picometer bandwidth grating filters are experimentally demonstrated. We design a low-loss low-reflection taper to seamlessly integrate the ultra-low-loss waveguide with standard heterogeneous Si/III-V integrated photonics platform to allow realization of high-performance photonic devices such as ultra-low-noise lasers and optical gyroscopes.

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“…These gratings are widely used in filters, sensors, and semiconductor lasers as a wavelength selective element, much like the ring resonator. The bandwidth of the grating is directly proportional to power coupling coefficient κ, and therefore can be minimized by reducing the perturbation strength of the grating [39]. At the same time, the length (L) of the grating should be long enough (κL ~ 1) and the loss of the waveguide must be low in order to obtain sufficient reflection.…”

Section: Narrow Bandwidth Bragg Gratingsmentioning

confidence: 99%

Ultra-Low-Loss Silicon Waveguides for Heterogeneously Integrated Silicon/III-V Photonics

et al. 2018

View full text Add to dashboard Cite

Integrated ultra-low-loss waveguides are highly desired for integrated photonics to enable applications that require long delay lines, high-Q resonators, narrow filters, etc. Here, we present an ultra-low-loss silicon waveguide on 500 nm thick Silicon-On-Insulator (SOI) platform. Meter-scale delay lines, million-Q resonators and tens of picometer bandwidth grating filters are experimentally demonstrated. We design a low-loss low-reflection taper to seamlessly integrate the ultra-low-loss waveguide with standard heterogeneous Si/III-V integrated photonics platform to allow realization of high-performance photonic devices such as ultra-low-noise lasers and optical gyroscopes.

show abstract

Ultra-narrowband fiber Bragg gratings for laser linewidth reduction and RF filtering

Cited by 24 publications

References 4 publications

Low kappa, narrow bandwidth Si_3N_4 Bragg gratings

Low kappa, narrow bandwidth Si_3N_4 Bragg gratings

Ultra-Low-Loss Silicon Waveguides for Heterogeneously Integrated Silicon/III-V Photonics

Ultra-Low-Loss Silicon Waveguides for Heterogeneously Integrated Silicon/III-V Photonics

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