| 1. |
- Banik, Biddut Kumar, 1978, et al.
(author)
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High Power Photonic MW/THz Generation Using UTC-PD
- 2008
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In: GigaHertz SympoSium 2008. ; , s. 45-
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Conference paper (peer-reviewed)abstract
- The ongoing research work concentrates on extending the previously accomplished UTC-PD fabrication and modelling techniques to 340 GHz and above. We have fabricated and characterized UTC-PDs intended for high power MW/THz generation. Several integrated antenna-detector circuits have been designed and characterised.
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| 2. |
- Banik, Biddut Kumar, 1978, et al.
(author)
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UTC-PD Integration for Submillimetre-wave Generation
- 2008
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In: 19th International Symposium on Space Terahertz Technology, ISSTT 2008; Groningen; Netherlands; 28 April 2008 through 30 April 2008. ; , s. P7-1, 135
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Conference paper (peer-reviewed)abstract
- Because of the inherent difficulty to generate power in the frequency range 0.l-10 THz, the term 'THzgap' has been coined. Among a number of MW/THz generation techniques, the photomixer based sources hold high potential offering wide tunability and decent amounts of output power. The photomixing technique relies on the nonlinear mixing of two closely spaced laser wavelengths generating a beat oscillation at the difference frequency. In recent years, there has been an increasing interest in the Uni-Travelling-Carrier PhotoDiode (UTCPD) [1] for photomixing, photo receivers, MW/THz-wave generation, fibre-optic communication systems, and wireless communications. UTC-PDs have become very promising by demonstrating output powers of 20 mW at 100 GHz [1] and 25 μW at 0.9 THz [2].
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| 3. |
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| 4. |
- Hedekvist, Per Olof E, 1967, et al.
(author)
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Microwave Harmonic Frequency Generation utilizing the properities of an Optical Phase Modulator
- 2004
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In: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 22:3, s. 882-886
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Journal article (peer-reviewed)abstract
- New techniques to generate a harmonic microwave frequency modulated on an optical carrier are presented. All these techniques utilize the polarization-dependent properties of a LiNbO3-phase modulator and manage to achieve 40-GHz modulation using only 10-GHz electronics. The signal quality of the generated frequency is mainly determined by the 10-GHz signal generator, and the suppression of undesired lower order harmonic frequencies exceeds 30 dB.
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| 5. |
- Lundström, Carl Peter, 1982, et al.
(author)
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Tension-optimized highly nonlinear fibers for parametric applications
- 2012
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In: European Conference on Optical Communications (ECOC), Amsterdam, The Netherlands. - 9781557529503 ; , s. Paper We.1.F-
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Conference paper (peer-reviewed)abstract
- We investigate the Brillouin and dispersive properties including localized measurements of nonlinear fibers spooled with tension gradients and discuss their application in parametric devices.
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| 6. |
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| 7. |
- Myslivets, E., et al.
(author)
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Dispersion Fluctuation Equalization Nonlinear Fibers by Spatially Controlled Tension
- 2010
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In: Optical Fiber Communication Conference, OFC 2010; San Diego, CA; United States; 21 March 2010 through 25 March 2010. - 2162-2701. - 9781557528841
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Conference paper (peer-reviewed)abstract
- We experimentally verified that spatial dispersive fluctuations in nonlinear fiber can be effectively suppressedby inverting precisely mapped zero-dispersion wavelength via application of longitudinally controlled stretching.
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| 8. |
- Myslivets, E., et al.
(author)
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Spatial Equalization of Zero-Dispersion Wavelength Profiles in Nonlinear Fibers
- 2009
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In: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 21:24, s. 1807-1809
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Journal article (peer-reviewed)abstract
- Longitudinal zero-dispersion wavelength (ZDW) fluctuations in long waveguides impose a fundamental limit on the achievable parametric mixer bandwidth. We demonstrate for the first time that the precisely measured ZDW profile can be taken advantage of by applying spatially controlled tension along the fiber length for fluctuation reduction and synthesis of a wide mixer response. The technique was experimentally validated by measuring local dispersion and tension maps and synthesizing a 145-nm-wide fiber parametric amplifier.
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| 9. |
- Perez-Millan, Pere, et al.
(author)
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Dispersion induced effects of high-order optical sidebands in the performance of millimeter-wave fiber-optic links
- 2006
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In: Microwave and optical technology letters. ; 48:7, s. 1436-1441
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Journal article (peer-reviewed)abstract
- In this paper, chirped fiber Bragg gratings (CFBGs) areproposed as signal-phase controllers for microwave-photonic wireless downstream fiber links. The effect of high-order modulation optical sidebands that disturbs the output mm-wave signal due to the chromatic dispersion induced by the gratings is studied theoretically and experimentally. The 1st and 2nd mm-wave harmonics of the output signal have been measured for conventional intensity modulation and for intensity modulation with optical carrier suppression. In the last case, data transmission at 2.5 Gb/s is demonstrated through a chirped grating of 280 ps/nm dispersion in a 40-GHz modulated link.
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| 10. |
- Pérez-Millan, Pere, et al.
(author)
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Optical demultiplexing of millimeter-wave subcarriers for wireless channel distribution employing dual wavelength FBGs
- 2007
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In: Optics Communications. - : Elsevier BV. - 0030-4018. ; 275:2, s. 335-343
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Journal article (peer-reviewed)abstract
- An optical mm-wave demultiplexer is presented. Double sideband modulation with suppressed optical carrier and filtering properties of dual overwritten fiber Bragg gratings are the fundamentals for optical demultiplexing of mm-wave radio-on-fiber signals: using a single optical carrier, Millimeter-wave signals of 20 and 40 GHz frequencies carrying independent data are created, transmitted over fiber, demultiplexed and wireless distributed to be detected and data recovered in a mobile unit. Double sideband modulation with suppressed optical carrier yields no power penalty due to chromatic dispersion, while the filtering properties of the dual overwritten fiber Bragg gratings allow less than −40 dB electrical power interchannel leakage. Independent 2.5 Gb/s On–Off-keyed data have been successfully transmitted through the 20 and 40 GHz channels.
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