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| 2. |
- Chen, Lawrence R., et al.
(författare)
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The Editorial
- 2023
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - 1558-4542 .- 1077-260X. ; 29:6
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Photonic signal processing is a broad and multi-disciplinary field, bringing together topics from physics, materials, and devices; communications, signal processing, and information theory; neuroscience; quantum information science; linear and nonlinear science; computing; and ultrafast science.
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| 3. |
- Enejder, Annika, 1969, et al.
(författare)
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Coherent Anti-Stokes Raman Scattering Microscopy of Cellular Lipid Storage
- 2010
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - 1558-4542 .- 1077-260X. ; 16:3, s. 506-515
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Tidskriftsartikel (refereegranskat)abstract
- With the increasing number of studies using nonlinear microscopy in the biosciences, an awareness for the potentials of nonlinear optics has begun to emerge among a broader audience. Coherent anti-Stokes Raman scattering (CARS) microscopy is one of the most technically challenging methods in this category, forming images of molecular distributions based on their vibrations by a multiphoton interaction process. The primary strength of CARS microscopy lies in the ability of imaging lipids; the full 3-D distribution in living cells can be mapped without exogenous tags. Thus, CARS microscopy has a strong potential to become a central instrument for in vivo studies of the lipid metabolism at cellular level, improving present understanding of the mechanisms behind the many metabolism-related diseases, the impact of natural bioactive components in foods, and supporting the development of efficient pharmaceuticals as well as bioengineering processes exploiting the metabolism of microorganisms for the production of alternative energy sources. We illustrate this wide range of biological applications of CARS microscopy with a series of examples from our research.
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| 4. |
- Fan, Yuchuan, et al.
(författare)
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Feedforward Neural Network-Based EVM Estimation : Impairment Tolerance in Coherent Optical Systems
- 2022
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - : Institute of Electrical and Electronics Engineers Inc.. - 1077-260X .- 1558-4542. ; 28:4
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Tidskriftsartikel (refereegranskat)abstract
- Error vector magnitude (EVM) is commonly used for evaluating the quality of m-ary quadrature amplitude modulation (mQAM) signals. Recently proposed deep learning techniques for EVM estimation extend the functionality of conventional optical performance monitoring (OPM). In this article, we evaluate the tolerance of our developed EVM estimation scheme against various impairments in coherent optical systems. In particular, we analyze the signal quality monitoring capabilities in the presence of residual in-phase/quadrature (IQ) imbalance, fiber nonlinearity, and laser phase noise. We use feedforward neural networks (FFNNs) to extract the EVM information from amplitude histograms of 100 symbols per IQ cluster signal sequence captured before carrier phase recovery. We perform simulations of the considered impairments, along with an experimental investigation of the impact of laser phase noise. To investigate the tolerance of the EVM estimation scheme to each impairment type, we compare the accuracy for three training methods: 1) training without impairment, 2) training one model for all impairments, and 3) training an independent model for each impairment. Results indicate a good generalization of the proposed EVM estimation scheme, thus providing a valuable reference for developing next-generation intelligent OPM systems.
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| 5. |
- Gao, Jitao, et al.
(författare)
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Elliptical-Core Highly Nonlinear Few-Mode Fiber Based OXC for WDM-MDM Networks
- 2021
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - 1558-4542 .- 1077-260X. ; 27:2
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Tidskriftsartikel (refereegranskat)abstract
- In order to realize an optical cross-connect (OXC) converting wavelengths and spatial modes into one-dimensional switching ports, we propose an active mode selective conversion without parasitic wavelength conversion, based on the intermodal four-wave mixing (FWM) arising in a few-mode fiber (FMF). First, we design a dispersion-engineered elliptical-core highly nonlinear FMF (e-HNL-FMF) with a graded refractive index (RI) profile, which can independently guide 3 linearly polarized (LP) spatial modes. Meanwhile, a high doping concentration of germanium in the core leads to relatively high intermodal nonlinear coefficients of 3.23 (W·km)-1 between LP01 and LP11a modes and 3.14 (W·km)-1 between LP01 and LP11b modes. Next, we propose an e-HNL-FMF based OXC scheme for wavelength division multiplexing-mode division multiplexing (WDM-MDM) networks. After optimizing both the e-HNL-FMF length and pump power, we can realize either active mode selective conversion over the designated wavelength-band or three-wavelength to three-mode superchannel conversion for 100 Gbaud 16-quadratic-amplitude modulation (16-QAM) signals over the C-band. Due to excellent characteristics of the e-HNL-FMF, both cost and configuration complexity of the OXC can be reduced, showing great potentials for all-optical signal processing in the future WDM-MDM networks.
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| 6. |
- Haglund, Emanuel, 1988, et al.
(författare)
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Silicon-Integrated Hybrid-Cavity 850-nm VCSELs by Adhesive Bonding: Impact of Bonding Interface Thickness on Laser Performance
- 2017
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - 1558-4542 .- 1077-260X. ; 23:6, s. 1700109-
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Tidskriftsartikel (refereegranskat)abstract
- The impact of bonding interface thickness on the performance of 850-nm silicon-integrated hybrid-cavity vertical-cavity surface-emitting lasers (HC-VCSELs) is investigated. The HC-VCSEL is constructed by attaching a III–V “half-VCSEL” to a dielectric distributed Bragg reflector on a Si substrate using ultrathin divinylsiloxane-bis-benzocyclobutene (DVS-BCB) adhesive bonding. The thickness of the bonding interface, defined by the DVS-BCB layer together with a thin SiO2 layer on the “half-VCSEL,” can be used to tailor the performance, for e.g., maximum output power or modulation speed at a certain temperature, or temperature-stable performance. Here, we demonstrate an optical output power of 2.3 and 0.9 mW, a modulation bandwidth of 10.0 and 6.4 GHz, and error-free data transmission up to 25 and 10 Gb/s at an ambient temperature of 25 and 85 °C, respectively. The thermal impedance is found to be unaffected by the bonding interface thickness.
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| 7. |
- Heinz, D., et al.
(författare)
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GaInN Quantum Wells as Optochemical Transducers for Chemical Sensors and Biosensors
- 2017
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-4542 .- 1077-260X. ; 23:2, s. 15-23
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, investigations on gallium indium nitride (GaInN) quantum well structures as optochemical transducers in (bio) chemical sensing are presented. In contrast to the conventional electrical read-out of III-nitride-based sensors, a purely optical photoluminescence read-out is performed. A significant spectral shift of the quantum well photoluminescence is observed with varying surface modification. The spectral photoluminescence shift can be attributed to an externally induced quantum confined Stark effect caused by the adsorbed species deposited on the quantum well surface. In order to improve the sensitivity of the transducer elements, different chemical surface treatments are studied. In particular, optical sensing experiments with reducing and oxidizing gases are performed in order to investigate the quantum well photoluminescence response. Additionally, optical investigations of the iron-storage molecule ferritinwith varying iron load are presented. The iron load of this molecule is generally considered as a superior biomarker for severe illnesses, such as Alzheimer's disease. In contrast to conventional fluorescent labels, GaInN quantum wells provide a much more stable luminescence signal, and hence, are promising candidates for next generation bioanalytical sensor structures.
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| 8. |
- Larsson, Anders, 1957
(författare)
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Advances in VCSELs for communication and sensing
- 2011
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - 1558-4542 .- 1077-260X. ; 17:6, s. 1552-1567
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Tidskriftsartikel (refereegranskat)abstract
- The vertical cavity surface emitting laser (VCSEL) has become a light source of great importance for industrial and consumer applications. This includes communication and sensing in particular, where dynamics and optical mode behavior are key performance characteristics. This tutorial treats relevant VCSEL basics, performance requirements and recent progress towards higher speed, higher single mode power and polarization control.
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| 9. |
- Metcalf, A. J., et al.
(författare)
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High-Power Broadly Tunable Electrooptic Frequency Comb Generator
- 2013
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-4542 .- 1077-260X. ; 19:6
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Tidskriftsartikel (refereegranskat)abstract
- Broadband traveling-wave electrooptic modulators made of lithium niobate have reached a high level of technological maturity. They can provide simultaneously low V pi, sustain high power (both optical and RF) and yet provide low propagation loss. By combining together these features, we present a high-power handling, broadly tunable, electrooptic frequency comb generator. The device produces between 60 and 75 lines within -10 dB bandwidth over its full tuning range-from 6 to 18 GHz- and can handle up to 1 W of optical input power. This optical frequency comb platform is very well suited for applications in RF photonics and optical communications that require independent RF and optical tuning as well as high-repetition rates but moderate bandwidth.
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| 10. |
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