| 1. |
- Lewen, R., et al.
(författare)
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High frequency characterization of a GaInAs/InP electronic waveguide T-branch switch
- 2002
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 91:4, s. 2398-2402
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Tidskriftsartikel (refereegranskat)abstract
- We report comprehensive microwave measurements on a T-branch switch; a GaInAs/InP electron waveguide based structure. The study includes a small signal model of the device where limitations of high frequency operation are discussed. An example of large signal operation where the nonlinearity of the device is exploited by operating the T-branch switch as a frequency multiplier is demonstrated.
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| 2. |
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| 3. |
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| 4. |
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| 5. |
- Arve, Per, et al.
(författare)
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Propagation of two-dimensional pulses in electromagnetically induced transparency media
- 2004
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 69:6, s. 063809-
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Tidskriftsartikel (refereegranskat)abstract
- The propagation in two dimensions of "optical" pulses in electromagnetically induced transparency media is analyzed. Results are presented for coupled Maxwell-Bloch equations with slowly varying envelope approximation, for both adiabatic and nonadiabatic situations. The possibility of changing the direction of the pulse by a switch of control beam direction is investigated in detail.
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| 6. |
- Berrier, Audrey, et al.
(författare)
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Negative Refraction at Infrared Wavelengths in a Two-Dimensional Photonic Crystal
- 2004
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 93:073902
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Tidskriftsartikel (refereegranskat)abstract
- We report on the first experimental evidence of negative refraction at telecommunication wavelengths by a two-dimensional photonic crystal field. Samples were fabricated by chemically assisted ion beam etching in the InP-based low-index constrast system. Experiments of beam imaging and light collection show light focusing by the photonic crystal field. Finite-difference time-domain simulations confirm that the observed focusing is due to negative refraction in the photonic crystal area.
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| 7. |
- Dainese, Matteo, et al.
(författare)
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Narrow band coupler based on one-dimensional Bragg reflection waveguide
- 2003
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Ingår i: 2003 Optical Fiber Communication Conference. - 1557527466 ; , s. 44-46
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Konferensbidrag (refereegranskat)abstract
- A new configuration based on the coupling between a conventional low loss, weakly guiding channel waveguide and a Bragg reflection waveguide (BRW) was discussed. The strong difference between the dispersion of a Bragg reflection waveguide and a channel waveguide was used to create a narrow band coupler. The two-dimensional analysis of the BRW was generally based on the transfer matrix method. The structure consisted of a weakly guiding conventional Ge-doped silica waveguide on the top of which a BRW was stacked. The number of periods in the mirror between the BRW and the silica waveguide affected the coupling length and ultimately the bandwidth.
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| 8. |
- Davanco, M., et al.
(författare)
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Directional coupler wavelength filters based on waveguides exhibiting electromagnetically induced transparency
- 2003
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Ingår i: IEEE Journal of Quantum Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9197 .- 1558-1713. ; 39:4, s. 608-613
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Tidskriftsartikel (refereegranskat)abstract
- We describe the principle and analyze the operation of an integrated optics directional coupler filter based on coupling between a regular waveguide and one, that exhibits electromagnetically induced transparency. Bandwidth length products on the order of 2 pm x mm are obtainable, as an example, using this approach.
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| 9. |
- Eriksson, U., et al.
(författare)
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Design and fabrication of electroabsorption modulators for data rates up to 100 Gb/s
- 2004
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Ingår i: Proc. Int. Conf. Transparent Opt. Netw.. - 0780383435 - 9780780383432 ; , s. 41-46
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Konferensbidrag (refereegranskat)abstract
- We present segmented transmission-line (TML) electroabsorption modulators (EAM) matched to 50 Ω. The devices show excellent high frequency performance up to 50 GHz, and exhibit a maximum model-extrapolated 3 dBe bandwidth of 90 GHz. Design considerations and optimization techniques for periodic segmented TML-EAMs are discussed. Also methods used for the device fabrication are presented.
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| 10. |
- Forsberg, Erik, et al.
(författare)
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Limits to modulation rates of electroabsorption modulators
- 2004
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Ingår i: IEEE Journal of Quantum Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9197 .- 1558-1713. ; 40:4, s. 400-405
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Tidskriftsartikel (refereegranskat)abstract
- We analyze the speed limitations of optical electroabsorption modulators. We argue that modulation rate limits are closely related to quantum mechanical adiabaticity. By analyzing the breakdown of the adiabatic approximation, analytical expressions for modulation limits are found. These expressions are numerically validated. Furthermore, we discuss the constraints on the allowable modulation rate set by losses from the quantum well and transition linewidth.
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