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  • 1. Drummond, Miguel V.
    et al.
    Nogueira, Rogerio N.
    Monteiro, Paulo P.
    Violas, Manuel A.
    Sterner, Carola
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Tunable Optical Dispersion Compensator Based on Power Splitting Between Two Dispersive Media2010In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 28, no 8, p. 1164-1175Article in journal (Refereed)
    Abstract [en]

    In this paper, we propose and experimentally demonstrate a novel tunable optical dispersion compensator (TODC). Dispersion compensation is achieved by splitting the input signal between two dispersive media and adding the resulting signals thereafter. Tunable compensation is attained by controlling the power splitting ratio of the input signal between both dispersive media. The frequency response of the TODC is theoretically assessed considering signal addition in the optical and electrical domains. The latter case is enabled by using optical single side-band (OSSB) modulation, which allows preserving the phase information of dispersive media output signals after direct detection. This is the only case experimentally tested, since it avoids stability problems related with coherent addition of optical signals. A TODC with a tuning range of -340 to 0 ps/nm was designed and experimentally assessed for a 40 Gb/s nonreturn-to-zero OSSB signal. The tunable power splitter consisted of an automatic polarization controller and a polarization beam splitter, which offered a tuning time lower than 150 mu s. A bit error rate lower than 10(-8) was measured on the entire compensation range with a maximum power penalty of 3.3 dB relatively to an SSB signal in back-to-back.

  • 2. Drummond, Miguel V.
    et al.
    Nogueira, Rogerio N.
    Violas, Manuel
    Monteiro, Paulo P.
    Sterner, Carola
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    All-optical generation of 40 Gb/s single sideband signals using a fiber Bragg grating2010In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 283, no 12, p. 2492-2495Article in journal (Refereed)
    Abstract [en]

    In this work, we demonstrate a reliable all-optical technique for performing optical double sideband (ODSB) to single sideband (OSSB) format conversion of a 40 Gb/s non-return-to-zero signal. It is based on the optimization of a detuned optical filter, which was implemented on a fiber Bragg grating (FBG) with a complex apodization profile. An OSSB signal with negligible distortion was obtained, as the FBG presented a nearly ideal frequency response. Higher tolerance to chromatic dispersion enabled by the OSSB signal in comparison to the ODSB signal was demonstrated on both simulation and experimental results. (C) 2010 Elsevier B.V. All rights reserved.

  • 3. Nilsson, L. -E
    et al.
    Claesson, A.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101). KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC. Swiss Federal Institute of Technology, Switzerland.
    Specialty Single-Mode Fibers2007In: Specialty Optical Fibers Handbook, Elsevier, 2007, p. 165-193Chapter in book (Refereed)
    Abstract [en]

    This chapter provides an overview of unusual multifunctional, specialty single-mode fibers-macrohole fibers, multicore fibers, fibers with internal electrodes, and fibers for high-temperature resistant fiber Bragg gratings. Macrohole fibers belong to the group of microstructured fibers, which encompass a wide variety of fibers with air holes or other structures extending in the axial direction. Functions performed using macrostructured fibers include supercontinuum generation in tapered hole fibers, dispersion management, fibers with decreased bend loss for compact optical fiber wiring, and fibers for polarimetric sensing, and lasers. The introduction of materials in the holes adds the possibility of manipulating the guiding properties of the fiber. This can be achieved by interaction of the guided mode with actively controllable materials in the holes or by using the inserted materials for other active functions, such as a metal electrode to implement electro-optic control of the fiber. The proposed applications for multicore fibers span over lasers and amplifiers, transport fibers for broadband communications, passive, and active fiber optic components such as filters, multiplexers, and various kinds of sensors. The ultimate multicore fiber is the image fiber used in endoscopes and other such devices.

  • 4.
    Nilsson, Lars-Erik
    et al.
    Acreo.
    Yu, Zhangwei
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Tarasenko, Oleksandr
    Acreo.
    Knape, Harald
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Margulis, Walter
    Acreo.
    High-speed switching in fibres with electrodes2007In: ICTON 2007: Proceedings of the 9th International Conference on Transparent Optical Networks, Vol 1, 2007, p. 232-233Conference paper (Refereed)
    Abstract [en]

    Fibres with holes are provided with metal electrodes that fill the entire cross-section of the holes. Refractive index change and birefringence result from applying high current pulses for time intervals in the nanosecond range. High-speed polarization rotation and fibre Bragg grating wavelength tuning can be accomplished. Such electrically driven components are totally spliced with low insertion loss. They have no moving parts, are < 10 cm long and can be used in fibre laser cavities for Q-switching.

  • 5.
    Nogueira, R.
    et al.
    Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal.;Nokia Siemens Networks Portugal SA, Amadora 2720093, Portugal. Acreo AB, SE-164 Kista, Sweden. Royal Inst Technol, Kista Photon Res Ctr, SE-164 Kista, Sweden..
    Drummond, M.
    Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal..
    Marques, C.
    Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal..
    Albuquerque, A.
    Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal..
    Monteiro, R.
    Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal..
    Navarro, A.
    Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal..
    Teixeira, A.
    KTH.
    Andre, P. S.
    Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal..
    Violas, M.
    Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal..
    Monteiro, P.
    KTH. Inst Telecomun, Campus Univ, P-3810391 Aveiro, Portugal.;Nokia Siemens Networks Portugal SA, Amadora 2720093, Portugal. Acreo AB, SE-164 Kista, Sweden. Royal Inst Technol, Kista Photon Res Ctr, SE-164 Kista, Sweden..
    Sterner, C.
    Fonjallaz, P-Y
    KTH.
    All-Optical Signal Processing Techniques with Fiber Based Devices2009In: ICTON: 2009 11TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS, VOLS 1 AND 2, IEEE , 2009, p. 806-+Conference paper (Refereed)
  • 6.
    Petermann, Ingemar
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Helmfrid, Sten
    Proximion AB, Kista.
    Fonjallaz, Pierre-Yves
    Acreo AB, Kista.
    Fibre Bragg characterization with ultraviolet-based interferometric side diffraction2003In: Journal of Optics. A, Pure and applied optics, ISSN 1464-4258, E-ISSN 1741-3567, Vol. 5, no 5, p. 437-441Article in journal (Refereed)
    Abstract [en]

    The interferometric side diffraction method for fibre Bragg grating characterization is evaluated using a set-up with an ultraviolet interrogation beam. In its present configuration, the reproducibility errors are 2-5% for the index and typically 10degrees-20degrees for the phase profile. The reflection spectra of chirped test gratings have been successfully reproduced with the aid of the acquired phase and refractive index envelope data. It is verified that the power of the interrogating beam, within some limits, is unimportant as regards the phase reproducibility, and the importance of relating the analysis to the fabrication parameters of the grating under investigation is stressed.

  • 7.
    Petermann, Ingemar
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Sahlgren, Bengt
    Helmfrid, Sten
    Friberg, Ari
    Fonjallaz, Pierre-Yves
    Fabrication of advanced fiber Bragg gratings by use of sequential writing with a continuous-wave ultraviolet laser source2002In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 41, no 6, p. 1051-1056Article in journal (Refereed)
    Abstract [en]

    We present a novel scheme based on sequential writing for fabrication of advanced fiber Bragg gratings. As opposed to earlier sequential methods this technique uses a cw UV laser source and allows for very precise control and repetitivity of the formation of the gratings. Furthermore it is possible to use high average irradiances without destroying the fiber, resulting in considerable reduction in fabrication time for complex gratings. The method has been applied to several test gratings, which proved its versatility and quality.

  • 8. Udvary, E.
    et al.
    Bartoss, V.
    Chacinski, Marek
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Berceli, T.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Reduction of dispersion induced distortions by semiconductor optical amplifiers2008In: 2008 MIKON CONFERENCE PROCEEDINGS, VOLS 1 AND 2, 2008, p. 169-172Conference paper (Refereed)
    Abstract [en]

    An approach is presented to reduce the chromatic dispersion-induced distortions in optical links carrying combined baseband and microwave signals. This new method is based on the interplay of intensity dependent phase modulation in semiconductor optical amplifiers (SOAs) and fiber nonlinearities. Theoretical and experimental results are demonstrated for a 400 km long optical link.

  • 9. Udvary, E.
    et al.
    Berceli, T.
    Chacinski, Marek
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Reduction of Dispersion Induced Distortions in Radio over Fibre links2008In: 2008 EUROPEAN MICROWAVE CONFERENCE, VOLS 1-3, 2008, p. 1086-1089Conference paper (Refereed)
    Abstract [en]

    The application of microwave / millimeter-wave optical links for future mobile broadband services is limited by the dispersion of the fibre. We present an approach to reduce the chromatic dispersion-induced distortions in optical links carrying combined baseband and microwave signals. This new method is based on the interplay of intensity dependent phase modulation in semiconductor optical amplifiers (SOAs) and fibre nonlinearities. Theoretical and experimental results are demonstrated for different long optical links. The results show that the frequency notches caused by the dispersion-induced carrier suppression effect may be sharply alleviated and the transmitted digital signal performance can be improved. Investigations on a 400 km long fibre link proved the previous statement.

  • 10.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Djupsjobacka, Anders
    Photonics Department, Acero AB.
    Popov, Mikhail
    Photonics Department, Acero AB.
    Fonjallaz, Pierre-Yves
    Photonics Department, Acero AB.
    Direct detection of direct optically filtered millimeter-wave signals2007In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 19, no 2-4, p. 233-235Article in journal (Refereed)
    Abstract [en]

    Good performance of a direct optical microwave filter combined with direct detection consisting of a single superimposed grating used in reflection has been assessed through bit-error-rate (BER) measurement. In the passband with a 3-dB bandwidth of 2 GHz, the BER is below 1.2 x 10(-11), showing nearly ON-OFF behavior of the filter.

  • 11.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC. Acreo AB, Sweden .
    Margulis, Walter
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC. Acreo AB, Sweden .
    Tarasenko, O.
    High speed switching of a DFB grating in a twin-hole fibre2008In: Proceedings of SPIE - The International Society for Optical Engineering, 2008Conference paper (Refereed)
    Abstract [en]

    A distributed-feedback (DFB) grating was written in twin-hole fibres with internal electrodes. Due to the intrinsic birefringence, the grating has two ultra-narrow peaks (∼0.41 pm and ∼0.27 pm) corresponding to x- and y-polarization. The separation between them can vary from 40 pm to 104 pm when the temperature increases from room temperature to 96°C. The dominant contributions of the Bragg wavelength shift as the increasing temperature are the change in refracitive index of the fibre and the expansion of the substrate (largest). Under the current pulses excitation, full on-off switching with response time ∼2.5 ns has been achieved for x-polarization of the DFB grating.

  • 12.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Koch, Ralf
    Margulis, W.
    Tarasenko, O.
    Knape, H.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Nanosecond All-fiber Polarization Switch2009In: AOE 2008: ASIA OPTICAL FIBER COMMUNICATION AND OPTOELECTRONIC EXPOSITION AND CONFERENCE, NEW YORK: IEEE , 2009Conference paper (Refereed)
    Abstract [en]

    A novel all-fiber polarization switch was studied in a four-hole fiber with internal electrodes. Nanosecond full on-off switch with duration of 12.6 ns was obtained under the application of high voltage pulses.

  • 13.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Margulis, Walter
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Tarasenko, Oleksandr
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Physics of electrically switched fiber Bragg gratings2008In: 2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS, 2008, p. 580-581Conference paper (Refereed)
    Abstract [en]

    The physics of electrically switched FBGs was studied in fibers with internal electrodes. Wavelength shifts due to mechanical effects (nanoseconds) and heat (milliseconds) depend quadratically on the electrical pulse voltage and linearly on pulse duration.

  • 14.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Margulis, Walter
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Tarasenko, Oleksandr V.
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Physics of electricity switched fiber Bragg gratings2008Conference paper (Refereed)
    Abstract [en]

    The physics of electrically switched FBGs was studied in fibers with internal electrodes. Wavelength shifts due to mechanical effects (nanoseconds) and heat (milliseconds) depend quadratically on the electrical pulse voltage and linearly on pulse duration.

  • 15.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Margulis, Walter
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. ACREO, Sweden.
    Tarasenko, Oleksandr
    ACREO, Sweden.
    Knape, Harald
    ACREO, Sweden.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    High-Speed Control of Fiber Bragg Gratings2007In: 2007 Bragg Gratings, Photosensitivity and Poling in Glass Waveguides (BGPP), Optical Society of America, 2007Conference paper (Refereed)
    Abstract [en]

    FBGs were written in fiber with internal alloy electrodes. Nanosecond high current pulses cause metal expansion, increase birefringence and tune the gratings. High-speed wavelength switching was accomplished with potential use in Q-switching fiber lasers.

  • 16.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Margulis, Walter
    Acreo AB .
    Tarasenko, Oleksandr
    Acreo AB .
    Knape, Harald
    Acreo AB .
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Nanosecond switching of fiber Bragg gratings2007In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 15, no 22, p. 14948-14953Article in journal (Refereed)
    Abstract [en]

    A FBG was written in a two-hole fiber with internal alloy electrodes. Nanosecond high current pulses cause metal expansion, increase birefringence and tune the gratings with a response time of 29 ns. This short length, low loss, all-spliced high-speed wavelength switching devices described here has potential use in Q-switching fiber laser.

  • 17.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Tarasenko, Oleksandr
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Fonjallaz, Pierre-Yves
    KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
    Birefringence switching of Bragg gratings in fibers with internal electrodes2008In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 16, no 11, p. 8229-8235Article in journal (Refereed)
    Abstract [en]

    A fiber Bragg grating was written in a side-hole fiber with internal metal alloy electrodes. The initial geometrical birefringence of this fiber gives rise to two Bragg resonances separated by 43 pm. Nanosecond risetime current pulses of up to 23 A were applied to the metal electrode, which heated and expanded rapidly. This caused mechanical stress in the fiber on a nanosecond scale, resulting in a negative shift of the Bragg wavelength peak for the fast axis mode, and positive but smaller shift for the slow axis mode. The fast change increased the peak separation to similar to 143 pm, corresponding to an increase in birefringence from 4.0 x 10(-5) to 1.3 x 10(-4). Both peaks subsequently experienced a red-shift due to the relaxation of mechanical stress and the increasing core temperature transferred from the metal in many microseconds. Simulations give accurate description of the experimental results.

1 - 17 of 17
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