| 1. |
- Alam, A. S., et al.
(författare)
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LiNbO3/Si3N4-Bilayer Vertical Coupler for Integrated Photonics
- 2020
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Ingår i: Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS. - 1092-8081. ; 2020-May
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Konferensbidrag (refereegranskat)abstract
- The design of a LiNbO3/Si3N4-bilayer vertical coupler is proposed based on adiabatic transition from a thick-Si3N4 strip waveguide to a LiNbO3/thin-Si3N4 striploaded hybrid waveguide having a gross coupling loss of ∼0.08 dB.
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| 2. |
- DING, Yunhong, et al.
(författare)
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Linear all-optical signal processing using silicon micro-ring resonators
- 2016
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Ingår i: Frontiers of Optoelectronics. - : Springer Science and Business Media LLC. - 2095-2767 .- 2095-2759. ; 9:3, s. 362-376
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Forskningsöversikt (refereegranskat)abstract
- Silicon micro-ring resonators (MRRs) are compact and versatile devices whose periodic frequency response can be exploited for a wide range of applications. In this paper, we review our recent work on linear all-optical signal processing applications using silicon MRRs as passive filters. We focus on applications such as modulation format conversion, differential phase-shift keying (DPSK) demodulation, modulation speed enhancement of directly modulated lasers (DMLs), and monocycle pulse generation. The possibility to implement polarization diversity circuits, which reduce the polarization dependence of standard silicon MRRs, is illustrated on the particular example of DPSK demodulation.
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| 3. |
- Kadkhodazadeh, S., et al.
(författare)
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Towards quantitative three-dimensional characterisation of buried InAs quantum dots
- 2011
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Ingår i: Journal of Physics: Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 326:1
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Konferensbidrag (refereegranskat)abstract
- InAs quantum dots grown on InP or InGaAsP are used for optical communication applications operating in the 1.3 - 1.55 μm wavelength range. It is generally understood that the optical properties of such dots are highly dependent on their structural and chemical profiles. However, morphological and compositional measurements of quantum dots using transmission electron microscopy can be ambiguous because the recorded signal is usually a projection through the thickness of the specimen. Here, we discuss the application of scanning transmission electron microscopy tomography to the morphological and chemical characterisation of surface and buried quantum dots. We highlight some of the challenges involved and introduce a new specimen preparation method for creating needle-shaped specimens that each contain multiple dots and are suitable for both scanning transmission electron microscopy tomography and atom probe tomography.
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| 4. |
- Karunakaran, Anamika Nair, et al.
(författare)
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Stable soliton comb from dual ring microresonators
- 2023
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Ingår i: 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023.
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Konferensbidrag (refereegranskat)abstract
- In recent years, frequency combs have raised growing interest thanks to the increasing number of applications, ranging from astronomy[1], to telecommunications[2]. To this regard, microresonator-based frequency combs represent an attractive alternative to mode-locked lasers, due to their larger comb line spacing and lower power threshold. However, the stability of these combs depends on the detuning of the laser with respect to the resonance frequency, input power variation and thermal drift.
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| 5. |
- Skehan, Connor, 1993, et al.
(författare)
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Thermorefractive noise reduction of photonic molecule frequency combs using an all-optical servo loop
- 2023
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Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 31:21, s. 35208-35217
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Tidskriftsartikel (refereegranskat)abstract
- Phase and frequency noise originating from thermal fluctuations is commonly a limiting factor in integrated photonic cavities. To reduce this noise, one may drive a secondary “servo/cooling” laser into the blue side of a cavity resonance. Temperature fluctuations which shift the resonance will then change the amount of servo/cooling laser power absorbed by the device as the laser moves relatively out of or into the resonance, and thereby effectively compensate for the fluctuation. In this paper, we use a low noise laser to demonstrate this principle for the first time in a frequency comb generated from a normal dispersion photonic molecule micro-resonator. Significantly, this configuration can be used with the servo/cooling laser power above the usual nonlinearity threshold since resonances with normal dispersion are available. We report a 50 % reduction in frequency noise of the comb lines in the frequency range of 10 kHz to 1 MHz and investigate the effect of the secondary servo/cooling noise on the comb.
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