| 1. |
- Blaaberg, S., et al.
(författare)
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All-optical characterization of large-signal modulation bandwidth of a monolithically integrated DFB-EA
- 2009
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Ingår i: 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS 2009. - Washington, D.C. : Optical Society of America. - 9781557528698 ; , s. 1283-1284
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Konferensbidrag (refereegranskat)abstract
- We use an all-optical method to characterize the modulation bandwidth of a DFB-EA designed for 100 Gb/s Ethernet. In a large-signal wavelength conversion set-up, we show the device has an all-optical bandwidth of 83 GHz.
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| 2. |
- Chacinski, Marek, et al.
(författare)
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100 Gb/s ETDM Transmitter Module
- 2010
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - 1077-260X .- 1558-4542. ; 16:5, s. 1321-1327
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Tidskriftsartikel (refereegranskat)abstract
- Components of a 100 Gb/s transmitter with electrical time-division multiplexing are presented as following: electrical multiplexer, driver amplifier, and large-bandwidth distributed feedback-traveling-wave electro-absorption modulator module. The performance of the parts of the transmitter, as well as the complete chain, is investigated for data operation and transmission in future 100 Gb/s Ethernet (100GbE). Clearly open eye diagrams at 100 Gb/s are demonstrated together with data transmission over 300 m long standard single mode fiber link.
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| 3. |
- Chacinski, Marek, et al.
(författare)
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400km transmission of STM-16 data on baseband and DVBT on 40GHz subcarrier
- 2008
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Ingår i: 2008 International Conference on Telecommunications. - NEW YORK : IEEE. - 9781424420353 ; , s. 1-3
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Konferensbidrag (refereegranskat)abstract
- A 400 km standard single mode fiber (SSMF) link with a single light-intensity modulator was upgraded for simultaneous transmission of STM-16 2.5 Gbps baseband data and digital-video-broadcast-terrestrial DVBT utilizing a 40 GHz subcarrier. An optical circulator and narrowband fiber Bragg gratings (FBG) were used to separate the signals in the optical domain and allow for simple direct baseband detection of both.
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| 4. |
- Chacinski, Marek, et al.
(författare)
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50 Gb/s modulation and/or detection with a travelling-wave electro-absorption transceiver
- 2008
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Ingår i: 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference. - 9781557528568 ; , s. 94-96
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Konferensbidrag (refereegranskat)abstract
- Electro-Absorption-Transceiver (EAT) structures used as efficient Travelling-Wave Electro-Absorption-Modulator (TWEAM) as well as Travelling-Wave-Photo-Detector (TWPD) are investigated. Clear eye-openings at 50Gb/s for modulation and for detection are presented. Transmission over 2.2km and 5km SSMF were achieved.
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| 5. |
- Chacinski, Marek
(författare)
-
Dynamic Characterization of Semiconductor Lasers and Intensity Modulators
- 2009
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The research work presented in this thesis deals with characterization ofdynamics of active photonic devices that are based on semiconductormaterials. The thesis contains an introduction and a collection of publishedarticles in peer reviewed international journals and conferences.The introduction starts with the physical background and a review of thesemiconductor material properties which both affects the design andfabrication of the devices and determine their performance in applicationssuch as wavelength, optical power and attenuation, drive current andvoltage, temperature sensitivity and modulation bandwidth.The next chapter of the introduction is dedicated to various kinds ofsemiconductor lasers. It describes the physical principles, steady stateoperation and the dynamical response. The laser is essentially an opticalcavity consisting of a material with optical gain inbetween two reflectivemirrors. Special attention is given to the spectral shape of the mirrorreflectivity and its effect on the laser dynamics and how these effects canbe distinguished from those of the gain material.In order to improve dynamic performance, it is common that the laser,instead of being directly modulated by varying the drive current, isconnected to a separate modulator. The next chapter is therefore devotedto electroabsorption modulators for high speed intensity modulation andtheir integration to lasers. In order to fully take advantage of the highintrinsic modulation bandwidth of these devices it is important to havea good microwave design to avoid electrical parasitics. A segmented paddesign to achieve this is briefly described.The last part of the introduction covers measurements techniques that wereimplemented to experimentally investigate above devices. A description ofthe measurement methods, including practical hints and methods forevaluation of the measured results are provided.
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| 6. |
- Chacinski, Marek, et al.
(författare)
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Dynamic properties of electrically p-n confined, epitaxially regrown 1.27 μm InGaAs single-mode vertical-cavity surface-emitting lasers
- 2009
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Ingår i: IET optoelectronics. - : Institution of Engineering and Technology (IET). - 1751-8768 .- 1751-8776. ; 3:3, s. 163-167
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Tidskriftsartikel (refereegranskat)abstract
- The dynamic performance including chirp measurements of 1.27 mu m single-mode InGaAs/GaAs vertical-cavity surface-emitting lasers (VCSELs) with a large gain-cavity offset is presented. The VCSELs are based on a novel p-n confinement structure with selective area epitaxial regrowth. A resonance frequency of 9.11 GHz, a slope efficiency of 0.25 W/A and an alpha-factor of 5.7 were measured. The modulation bandwidth is limited by electrical parasitics. Eye diagrams at 5 Gb/s with 7 dB extinction ratio and Q-factor around 5 were obtained. The results are compared with the performance of oxide-confined VCSELs with similar active layer and negative gain-cavity detuning.
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| 7. |
- Chacinski, Marek, et al.
(författare)
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Electroabsorption Modulators Suitable for 100-Gb/s Ethernet
- 2008
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Ingår i: IEEE Electron Device Letters. - 0741-3106 .- 1558-0563. ; 29:9, s. 1014-1016
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Tidskriftsartikel (refereegranskat)abstract
- The design of a traveling-wave electroabsorption modulator (TWEAM) has been improved to decrease the drive voltage. The absorption layer was optimized and together with a novel segmentation of microwave design was introduced to increase the active modulator length. The resulting -3-dBe bandwidth of fabricated devices was estimated to be 99 GHz. Extinction ratios of 10 dB back-to-back and 6.7 dB after transmission over 2.2-km long fiber were measured with an incident drive voltage of only 2 V peak to peak. This TWEAM performance is believed to constitute a new state of the art for modulators suitable for 100-Gb/s Ethernet with on-off keying.
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| 8. |
- Chacinski, Marek, et al.
(författare)
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ETDM Transmitter Module for 100-Gb/s Ethernet
- 2010
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Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 22:2, s. 70-72
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Tidskriftsartikel (refereegranskat)abstract
- Performance of a packaged distributed-feedback travelling-wave electroabsorption modulator module for data transmission at 100 Gb/s is presented for the first time. Clearly open eye diagrams at 80 Gb/s with an extinction ratio ( ER) of 4.9 dB and 100 Gb/s with ER 4.2 dB ( limited by measurement setup) are demonstrated together with data transmission over 100-m-long standard single-mode fiber and over dispersion-compensated 10-km fiber link.
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| 9. |
- Chacinski, Marek, et al.
(författare)
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Extension of 40 Gbps link with a directly detected 2.5 Gbps subcarrier channel
- 2009
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Ingår i: 2009 11th International Conference on Transparent Optical Networks. - NEW YORK : IEEE. ; , s. 204-207
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Konferensbidrag (refereegranskat)abstract
- Simultaneous transmission was achieved of 40 Gbps at baseband and 2.5 Gbps modulation on a 50 GHz subcarrier utilizing a single 40 Gbps light-intensity modulator. A novel reception method based on optically separated baseband and single sideband channel permits direct detection of both signals with use of bandwidth limited photodiodes and dispersion tolerant transmission. This method can be used to increase the total capacity of an original 40 Gbps optical link to also carry a secondary signal.
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| 10. |
- Chacinski, Marek, et al.
(författare)
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Modulation and chirp evaluation of 100 GHz DFB-TWEAM
- 2010
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Ingår i: European Conference on Optical Communication, ECOC. - NEW YORK : IEEE.
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Konferensbidrag (refereegranskat)abstract
- The modulation and chirp performance of an InGaAsP based monolithically integrated distributed feedback (DFB) laser and travelling wave electro-absorption modulator (TWEAM) designed for 100Gb/s operation is presented. Open eye-diagrams at 100Gb/s, and error free 50Gb/s BER (limited by measurement system) were achieved. The chirp factor varied between 1.5 and 0 for absorptions between 10% and 90%.
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