Second and third order dispersion generation using nonlinearly chirped silicon waveguide gratings

Chen, G F R; Wang, T; Donnelly, Christine A.; Tan, Dawn T. H.

doi:10.1364/oe.21.029223

Cited by 26 publications

(14 citation statements)

References 27 publications

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“…Numerous applications are already based on χ (1) -gratings in waveguides such as reconfigurable Bragg filters [ 6], o ptical s witching [31, 5 2], m ode c onversion [ 53] o r o ptical s torage [10]. The presence of an effective χ (2) -grating in amorphous Si 3 N 4 waveguides may lead to the development of further functionalities such as parametric down-conversion [54], all optical signal processing [52], and possibly also self-referencing of frequency combs that exploits the simultaneous presence of χ (2) and χ (3) in low-loss Si 3 N 4 waveguides [55][56][57].…”

Section: Discussionmentioning

confidence: 99%

Photo-induced second-order nonlinearity in stoichiometric silicon nitride waveguides

et al. 2017

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Abstract:We report the observation of second-harmonic generation (SHG) in stoichiometric silicon nitride waveguides grown via low-pressure chemical vapor deposition (LPCVD). Quasirectangular waveguides with a large cross section were used, with a height of 1 µm and various different widths, from 0.6 to 1.2 µm, and with various lengths from 22 to 74 mm. Using a mode-locked laser delivering 6-ps pulses at 1064 nm wavelength with a repetition rate of 20 MHz, 15% of the incoming power was coupled through the waveguide, making maximum average powers of up to 15 mW available in the waveguide depending on the waveguide cross section. Second-harmonic output was observed with a delay of minutes to several hours after the initial turn-on of pump radiation, showing a fast growth rate between 10 −4 to 10 −2 s −1 , with the shortest delay and highest growth rate at the highest input power. After this first, initial build-up (observed delay and growth), the second-harmonic became generated instantly with each new turn-on of the pump laser power. Phase matching was found to be present independent of the used waveguide width, although the latter changes the fundamental and second-harmonic phase velocities. We address the presence of a second-order nonlinearity and phase matching, involving an initial, power-dependent build-up, to the coherent photogalvanic effect. The effect, via the third-order nonlinearity and multiphoton absorption leads to a spatially patterned charge separation, which generates a spatially periodic, semi-permanent, DC-field-induced second-order susceptibility with a period that is appropriate for quasi-phase matching. The maximum measured second-harmonic conversion efficiency amounts to 0.4% in a waveguide with 0.9 × 1 µm 2 cross section and 36 mm length, corresponding to 53 µW at 532 nm with 13 mW of IR input coupled into the waveguide. The maximum equivalent χ (2) -susceptibility amounts to 3.7 pm/V, as retrieved from the measured conversion efficiency.

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Section: Discussionmentioning

confidence: 99%

Photo-induced second-order nonlinearity in stoichiometric silicon nitride waveguides

et al. 2017

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“…One solution is combining the dispersive fiber (i.e., SMF in our demonstration) with another type of fiber which has the opposite sign of TOD [61] to yield overall close-to-zero TOD. Another method is using fiber Bragg gratings which have more compact volume and can be flexibly designed to control both the second-and the higherorder dispersion terms [62]- [64].…”

Section: B Characterization Of the Dispersion Matrix And Higher-ordementioning

confidence: 99%

Microcomb-Based True-Time-Delay Network for Microwave Beamforming With Arbitrary Beam Pattern Control

Xue

Xuan

Bao

et al. 2018

J. Lightwave Technol.

113

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Microwave phased array antennas (PAAs) are very attractive to defense applications and high-speed wireless communications for their abilities of fast beam scanning and complex beam pattern control. However, traditional PAAs based on phase shifters suffer from the beam-squint problem and have limited bandwidths. True-time-delay (TTD) beamforming based on lowloss photonic delay lines can solve this problem. But it is still quite challenging to build large-scale photonic TTD beamformers due to their high hardware complexity. In this paper, we demonstrate a photonic TTD beamforming network based on a miniature microresonator frequency comb (microcomb) source and dispersive time delay. A method incorporating optical phase modulation and programmable spectral shaping is proposed for positive and negative apodization weighting to achieve arbitrary microwave beam pattern control. The experimentally demonstrated TTD beamforming network can support a PAA with 21 elements. The microwave frequency range is 8 ∼ 20 GHz; and the beam scanning range is ±60.2 • . Detailed measurements of the microwave amplitudes and phases are performed. The beamforming performances of Gaussian, rectangular beams and beam notch steering are evaluated through simulations by assuming a uniform radiating antenna array. The scheme can potentially support larger PAAs with hundreds of elements by increasing the number of comb lines with broadband microcomb generation.

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“…Recently, much effort has been devoted to implement these devices in silicon-on-insulator (SOI) using integrated Bragg gratings (IBGs) in strip or rib waveguides. Uniform [5,6], phase-shifted [5,7], superimposed [8], and chirped gratings [9,10] have already been demonstrated. However, to obtain high quality bandpass filters with well-controlled phase responses, it is necessary to fabricate longer IBGs with weaker coupling coefficients.…”

mentioning

confidence: 99%

“…The first design has an in-band dispersion-less phase response, which is of interest for chip-scale wavelength-division multiplexing (WDM) networks, and the second has a linear group delay, which is of interest for on-chip phase engineering. Devices similar to the second design (chirped filter) have already been fabricated in SOI [9,10], however with bandwidths ranging from 20 to 100 nm and relatively low side-lobe suppression ratio (SLSR) (from 4 to 8 dB). The first design (dispersion-less filter) has never been fabricated in SOI likely because of its high phase noise sensitivity.…”

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confidence: 99%

Bandpass integrated Bragg gratings in silicon-on-insulator with well-controlled amplitude and phase responses

et al. 2015

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Bandpass filters with square shape amplitude responses and well-controlled dispersion characteristics are achieved by accurate apodization of Bragg grating structures in silicon-on-insulator waveguides. For these devices, precise tailoring of their frequency response typically requires low coupling coefficients and relatively long on-chip propagation lengths. These challenges are addressed by implementing apodization by phase-modulation and using wider strip waveguides to reduce phase noise. This design approach is demonstrated with a dispersion-less narrowband filter and a chirped bandpass filter.

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Second and third order dispersion generation using nonlinearly chirped silicon waveguide gratings

Cited by 26 publications

References 27 publications

Photo-induced second-order nonlinearity in stoichiometric silicon nitride waveguides

Photo-induced second-order nonlinearity in stoichiometric silicon nitride waveguides

Microcomb-Based True-Time-Delay Network for Microwave Beamforming With Arbitrary Beam Pattern Control

Bandpass integrated Bragg gratings in silicon-on-insulator with well-controlled amplitude and phase responses

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