| 1. |
- Banik, Biddut Kumar, 1978, et al.
(författare)
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Development and Design of a 340 GHz Photomixer Source
- 2007
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Ingår i: 18th International Symposium on Space THz Technology – ISSTT 2007.
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Konferensbidrag (refereegranskat)abstract
- We present the design of an InGaAlAs/InP uni-traveling-carrier photo-diode (UTC-PD) at mm-wave frequencies up to 340 GHz. The photo diode epitaxy is optimized using a quasi-3D software implementing the hydrodynamic semiconductor equations, for which an output power of 3 mW at 340 GHz was simulated. An equivalent circuit of the UTC-PD has been fitted to experimental S11 measurements up to 67 GHz. Finally, an optimized antenna coupled UTC-PD with choke filter has been designed. This MMIC circuit is intended for photomixing, with output power at 340 GHz.
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| 2. |
- Banik, Biddut Kumar, 1978, et al.
(författare)
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High Power Photonic MW/THz Generation Using UTC-PD
- 2008
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Ingår i: GigaHertz SympoSium 2008. ; , s. 45-
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Konferensbidrag (refereegranskat)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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| 3. |
- Banik, Biddut Kumar, 1978, et al.
(författare)
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UTC-PD Integration for Submillimetre-wave Generation
- 2008
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Ingår i: 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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Konferensbidrag (refereegranskat)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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| 4. |
- Eliasson, Henrik, 1985, et al.
(författare)
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Transmitter mask testing for 28 GBaud PM-QPSK
- 2013
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Ingår i: Optical Communication (ECOC 2013), 39th European Conference and Exhibition on. - : Institution of Engineering and Technology. - 9781849197595 ; 2013, s. 282 - 284
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Konferensbidrag (refereegranskat)abstract
- We suggest a method for pass/fail testing of PM-QPSK transmitters. The test is based on mask testing with time-resolved EVM and accepts transmitters where individual impairments cause less than 0.5 dB OSNR penalty. The design of the test is performed by computer simulations followed by experimental verification of some key results.
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| 5. |
- Vukusic, Josip, 1972, et al.
(författare)
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Development of Uni-Travelling-Carrier Photodiodes
- 2006
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Ingår i: 4th ESA Workshop on Millimetre Wave Technology and Applications.
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Konferensbidrag (refereegranskat)abstract
- We have fabricated and characterized InGaAsP/InP uni-travelling-carrier photodiodes (UTC-PDs). An UTC-PD layer structure in the material system InGaAlAs/InP was also designed and grown with in-house molecular beam epitaxy (MBE). Using standard III-V processing involving lithography, metallization and etching, diodes of different sizes have been fabricated. Time domain and eye-diagram measurements have been performed. Limitations in the measurement system were identified and compensated for when measuring the bandwidth. The resulting bandwidth is in agreement with the area dependent RC-limitation which was estimated using quasi-DC capacitance-voltage (C-V) measurements.
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| 6. |
- Vukusic, Josip, 1972, et al.
(författare)
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Fabrication and Characterization of InGaAlAs/InP based Uni-Traveling-Carrier Photodiodes
- 2006
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Ingår i: The Joint 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics. - 1424404002 ; , s. 138-
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Konferensbidrag (refereegranskat)abstract
- We have fabricated and characterized InGaAlAs/InP uni-traveling-carrier photodiodes intended for photo-mixing and data-com applications. Bandwidths up to 60GHz were recorded with 8.5µm diameter devices for which a matched, integrated antenna-detector circuit has been designed.
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| 7. |
- Wiberg, Andreas, 1978, et al.
(författare)
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Characterization of uni-traveling carrier photodiodes for high-linearity and high-SNR applications
- 2010
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Ingår i: Microwave and Optical Technology Letters. - : Wiley. - 1098-2760 .- 0895-2477. ; 52:6, s. 1460-1460
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Tidskriftsartikel (refereegranskat)abstract
- A typical uni-traveling carrier photodiode (UTC-PD) and a commercial PIN-PD are compared in the context of the analog performance at 10 GHz in a realistic noise environment.The behavior of the carrier-to-noise ratio (CNR), the linearity, represented by the third-order output intercept point (OIP3), and the spurious free dynamic range are studied as a function of photocurrent. We have found that the increment of the CNR is only minor because of excess noise of the amplifier, as an optical amplifier is used to reach high optical power. However, the OIP3 of the UTC-PD is substantially higher and increases with photocurrent, in contrast to the PIN-PD. Thus, even though the responsivity is lower, it is beneficial to use a UTC-PD to have superior dynamic range.
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| 8. |
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| 9. |
- Andrekson, Peter, 1960, et al.
(författare)
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High resolution optical waveform sampling using fiber-optic parametric amplifiers
- 2008
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Ingår i: 2008 IEEE/LEOS Winter Topical Meeting Series; Sorrento; Italy; 14 January 2008 through 16 January 2008. - 9781424415953 ; , s. 55-56
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Konferensbidrag (refereegranskat)abstract
- Techniques to analyze optical waveforms with high resolution are discussed. Emphasis is on all-optical sampling using FOPAs that offer high resolution with excellent sensitivity.
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| 10. |
- Andrekson, Peter, 1960, et al.
(författare)
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Nonlinearity-based all-optical sampling of ultrahigh-bandwidth optical signals
- 2004
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. ; 5596, s. 319-331
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Konferensbidrag (refereegranskat)abstract
- We demonstrate an all-optical waveform sampling system with simultaneous sub-mW optical signal sensitivity (20 dB SNR) and sub-picosecond temporal resolution over more than 60 nm optical bandwidth. The optical sampling was implemented by four-wave mixing in a 10 m highly nonlinear fiber using a sampling pulse source with a sampling pulse peak power of only 16 W. The sampling performance was evaluated in terms of sensitivity, temporal resolution and optical bandwidth with respect to fiber length, sampling pulse source wavelength offset from the zero-dispersion wavelength of the highly nonlinear fiber, sampling pulse peak power and walk-off due to chromatic dispersion. We also present a summary of the available methods to achieve polarization-independent optical sampling.
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| 11. |
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| 12. |
- Andrekson, Peter, 1960, et al.
(författare)
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Ultrafast, atto-Joule switch using fiber-optic parametric amplifier operated in saturation
- 2008
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Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 16:15, s. 10956-10961
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Tidskriftsartikel (refereegranskat)abstract
- ll-optical manipulation of signals carried by lightwaves is attractive because controlling the light directly can be more efficient, allows a multitude of signal formats, and can also prove most cost effective. We implemented a novel scheme for ultrafast optical switching using very small control energy that relies on the use of a saturated fiber-optic parametric amplifier. Approximately 19 aJ (150 photons) of control pulse energy was needed for 50% extinction of the signal which is three to four orders of magnitude smaller than in other all-optical switching demonstrations. This allows the consideration of novel practical approaches to implement all-optical switching devices and all-optical subsystems for telecommunications and other applications.
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| 13. |
- Chavez Boggio, José Manuel, et al.
(författare)
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Double-pumped FOPA with 40 dB flat gain over 81 nm bandwidth
- 2008
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Ingår i: ECOC 2008, 21-25 September 2008, Brussels, Belgium. ; , s. Tu.3.B.5-
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Konferensbidrag (refereegranskat)abstract
- We report the construction and characterization of a record performance continuous-wave double-pumpedfiber-optical parametric amplifier exhibiting 40 dB flat gain over 81nm bandwidth.
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| 14. |
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| 15. |
- Hansryd, Jonas, 1972, et al.
(författare)
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Impact of PMD on four-wave-mixing-induced crosstalk in WDM systems
- 2000
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Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 12:9, s. 1261-1263
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Tidskriftsartikel (refereegranskat)abstract
- The impact of polarization-mode dispersion (PMD) on four-wave mixing crosstalk in wavelength-division-multiplexed (WDM) fiber systems is quantified on a commercial system. It is found that even a small amount of PMD reduces the benefit of using polarization-multiplexed channels for suppression of crosstalk. As a rule of thumb, it is suggested that polarization-multiplexed schemes are of significant interest only when system differential group-delay (DGD) is smaller than DGD <1/(4Δf), where Δf is the channel-spacing.
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| 16. |
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| 17. |
- Hellström, E., et al.
(författare)
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Third-order dispersion compensation using a phase modulator
- 2003
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 20:5, s. 1188-1197
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Tidskriftsartikel (refereegranskat)abstract
- Compensation of third-order dispersion in a fiber-optic transmission system using a phase modulator is studied both theoretically and experimentally. A sinusoidal signal is used as modulation function, where the amplitude and phase delay are optimized. The 2-ps input pulses (160-Gb/s compatible) were transmitted through a 626-km fiber link, where the characteristic oscillating tail was measured with a 1.6-ps resolution optical sampling system. When applying the phase modulation, the oscillating tail was significantly suppressed. The pulses were also used in a 160-Gb/s transmission experiment, where the eye diagrams were measured with the sampling system. Numerical simulations and practical experiments showed excellent agreement.
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| 18. |
- Karlsson, Magnus, 1967, et al.
(författare)
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Effect of nonlinearities on PMD system degradations
- 2006
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Ingår i: OFC/NFOEC 2006. 2006 Optical Fiber Communication Conference and National Fiber Optic Engineers Conference. ; , s. OWE4-
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Konferensbidrag (refereegranskat)abstract
- We review and discuss cross-phase modulation-induced polarization state changes in WDM systems, so called cross-polarization modulation, XPolM, and how it influences outage probabilities in polarization mode dispersion-limited systems
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| 19. |
- Karlsson, Magnus, 1967, et al.
(författare)
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Effects of Nonlinearities on PMD-Induced System Impairments
- 2006
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 24:11, s. 4127-4137
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Tidskriftsartikel (refereegranskat)abstract
- It is well known that cross-phase-modulation-induced polarization rotation, cross-polarization modulation (XPolM), significantly degrades the performance of polarization-mode-dispersion (PMD) compensators. In this paper, the research on XPolM is reviewed, unique simulations of XPolM in the presence of walk off are presented, and some pitfalls are demonstrated with respect to choice of data streams in such simulations. Then, the authors discuss how XPolM affects PMD and PMD-induced outage probabilities (OP) in fiber-communication systems by providing analytical formulas for the OP with and without XPolM. Finally, the XPolM and PMD compensation are tied together by giving simple rules of thumb for when XPolM degrades PMD compensated systems, and PMD mitigation methods that are robust to XPolM are discussed.
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| 20. |
- Karlsson, Magnus, 1967, et al.
(författare)
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High-speed OTDM and impact of PMD
- 1999
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Ingår i: 1999 IEEE LEOS Annual Meeting Conference Proceedings. LEOS'99. 12th Annual Meeting. IEEE Lasers and Electro-Optics Society 1999 Annual Meeting. - 0780356349
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Konferensbidrag (refereegranskat)abstract
- We discuss the impact of polarization mode dispersion (PMD) in high-speed fiber transmission. Special emphasis is put on PMD compensation techniques, and their intrinsic limitations. We also propose a new and simple distributed compensation scheme.
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| 21. |
- Karlsson, Magnus, 1967, et al.
(författare)
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Higher order polarization mode dispersion compensator with three degrees of freedom
- 2001
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Ingår i: Optical Fiber Communication Conference and International Conference on Quantum Information. - 1557526540
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Konferensbidrag (refereegranskat)abstract
- We compare several PMD compensation methods, and find that the simple PMD compensator with a variable polarization controller (PC) and a variable time delay line can compensate for not only first, but also higher order PMD.
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| 22. |
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| 23. |
- Karlsson, Magnus, 1967, et al.
(författare)
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PMD Compensation Using 2R and 3R Regenerators
- 2004
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Ingår i: Proceedings of European Conference on Optical Communication, ECOC 2004´, Stockholm, Sweden,September 5-9, 2004. ; , s. Paper We1.4.2-
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Konferensbidrag (refereegranskat)
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| 24. |
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| 25. |
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