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  • 1.
    Chen, Daru
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Qin, Shan
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Yu, Zhangwei
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Tunable and injection-switchable erbium-doped fiber laser of line structure2007In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 49, no 4, p. 765-768Article in journal (Refereed)
    Abstract [en]

    A tunable and injection-switchable erbium-doped fiber (EDF) laser is proposed based on a line structure formed by a fiber Sagnac loop reflector and an fiber Bragg grating (FBG). Wavelength switching is achieved by controlling the power of the tunable injection laser. The self-seeded wavelength corresponding to the Bragg wavelength of the FBG can be tuned by, for example, heating the FBG, and the injection wavelength can be tuned over a wide range of about 50 nm. The characteristics of the wavelength switching for different levels of the EDF pump power and different wavelengths of the injection laser are studied experimentally. The present fiber laser has the advantages of tunability, stability, low amplified spontaneous emission noise, and high injection efficiency when compared with a fiber ring laser. Rapid wavelength switching is expected and the transient switching response of the laser is also studied.

  • 2.
    Chen, Daru
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Yu, Zhangwei
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Qin, S.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.
    Switchable dual-wavelength Raman erbium-doped fibre laser2006In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 42, no 4, p. 202-204Article in journal (Refereed)
    Abstract [en]

    A fibre Bragg grating feedback fibre laser with both Raman and erbium-doped fibre pumps is proposed. Dual-wavelength switching is achieved by controlling the power of the Raman pump. The characteristics of the dual-wavelength switching are studied experimentally, and the mechanism is explained physically.

  • 3.
    Chen, Daru
    et al.
    Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University.
    Yu, Zhangwei
    Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University.
    Qin, Shan
    Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University.
    He, Sailing
    Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University.
    Some switchable dual-wavelength fibre lasers based on fibre Bragg grating feedback2006In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 6351, p. U864-U872Article in journal (Refereed)
    Abstract [en]

    Two methods to achieve dual-wavelength switching in a fibre laser are proposed and two corresponding switchable dual-wavelength fibre lasers based on fibre Bragg grating (FBG) feedback are demonstrated in this paper. In one proposed fibre laser, both Raman and Erbium-doped fibre (EDF) pumps are employed and the dual-wavelength switching is achieved by controlling the power of the Raman pump. In the other proposed fibre laser, an injection technique is used and the dual-wavelength switching is realized by controlling the power of the injection laser. The detailed behavior of the dual-wavelength switching in the two fibre lasers is experimentally studied and the principle is explained physically.

  • 4. Kabakova, Irina V.
    et al.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Halliwell, David
    Fonjallaz, Pierre-Yves
    Tarasenko, Oleksandr
    de Sterke, C. Martijn
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Switching and dynamic wavelength conversion in a fiber grating cavity2012In: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, E-ISSN 1520-8540, Vol. 29, no 1, p. 155-160Article in journal (Refereed)
    Abstract [en]

    Switching and dynamic wavelength conversion of light are demonstrated in a fiber grating cavity detuned by high-voltage electrical pulses. The cavity dynamics is studied using a heterodyne technique in which the frequency-shifted light, trapped by the cavity, mixes with the backreflected light at the incident frequency. We find that the frequency shift scales linearly with the energy of the electric driving pulses.

  • 5.
    Malmström, Mikael
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, Oleksandr
    Acreo AB.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    All-Fiber Q-Switched and Cavity Dumped Laser Using an Electrically Addressed Microstructured Fiber2010In: Advanced Solid-State Photonics, 2010Conference paper (Refereed)
    Abstract [en]

    We report on a pulsed fiber laser with two regimes of operation, one where cavity-roundtrip pulse durations are produced (85 ns long, 40 Wpp) and one with high power pulses (2 ns long, 148 Wpp).

  • 6.
    Margulis, Walter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, Oleksandr
    Acreo.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Rugeland, Patrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Electrical fiber components and applications [invited]2012Conference paper (Other academic)
  • 7.
    Margulis, Walter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, Oleksandr
    Acreo AB.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Myrén, Niklas
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Electrically controlled fibers: what next2011In: 7th International Workshop on Fibre Optics and Passive Components, 2011Conference paper (Refereed)
    Abstract [en]

    The ability of providing a fiber with internal electrodes opens the doors for electricalcontrol of light in fibers. Refractive index change through poling and acoustic pulses arising fromheated electrodes are exploited to this end. We discuss main achievements and limitations, andlook ahead to what needs to be done for making these components more widely usable.

  • 8.
    Margulis, Walter
    et al.
    Acreo AB.
    Tarasenko, Oleksandr
    Acreo AB.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Rugeland, Patrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    High-Speed Switching in Optical Fibers2010Conference paper (Refereed)
  • 9.
    Margulis, Walter
    et al.
    Acreo AB.
    Tarasenko, Oleksandr
    Acreo AB.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Sterner, Carola
    Acreo AB.
    Rugeland, Patrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Myrén, Niklas
    Knape, Harald
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Applications of fibers with electrodes2010Conference paper (Refereed)
  • 10.
    Margulis, Walter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Rugeland, Patrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Knape, Harald
    Tarasenko, Oleksandr
    High-speed electrical switching in optical fibers [Invited]2011In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 50, no 25, p. E65-E75Article in journal (Refereed)
    Abstract [en]

    In this paper, we give an overview of recent results on switching of light in fibers with internal electrodes. Polarization rotation, nanosecond gating, and wavelength switching in fiber Bragg gratings and in long period gratings are discussed. Applications are exemplified in Q-switching fiber lasers and in RF-signal filtering.

  • 11.
    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.

  • 12.
    Rugeland, Patrik
    et al.
    Department of Fiber Photonics, Acreo AB, Stockholm, Sweden.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, Oleksandr
    Acreo AB.
    Tengstrand, Göran
    Saab Avitronics.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Rapid photonic microwave measurement using ultra narrow DFB FBG2009Conference paper (Refereed)
  • 13.
    Rugeland, Patrik
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, Oleksandr
    Tengstrand, Göran
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tunable photonic microwave generation based on a novel dual-polarization fiber laser cavity2011In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 23, no 24, p. 1878-1880Article in journal (Refereed)
    Abstract [en]

    A novel dual-polarization fiber laser is proposed by incorporating a distributed feedback grating inscribed in a twin-hole fiber with internal electrodes. Dual-polarization lasing is achieved with a spectral separation of 42 pm. By beating the optical waves at a photodiode, a microwave signal at 5.244 GHz is achieved with a signal-to-noise ratio 45 dB. An electrically tuned microwave signal with a tunable range of 150 MHz is demonstrated.

  • 14.
    Rugeland, Patrik
    et al.
    Department of Fiber Photonics, Acreo AB, Stockholm, Sweden.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, Oleksandr
    Acreo AB.
    Tengstrand, Görand
    Saab Avitronics.
    Margulis, Walter
    Acreo AB.
    Tunable microwave generation using novel fiber laser cavity2009Conference paper (Refereed)
  • 15.
    Yu, Zhangwei
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Fibre Bragg Grating Components for Filtering, Switching and Lasing2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Fibre Bragg gratings (FBGs) are key components for a vast number of applications in optical communication systems, microwave photonics systems, and optical sensors, etc. The main topic of this thesis is fibre Bragg grating fabrication and applications in direct microwave optical filtering, high speed switching and switchable dual-wavelength fibre lasers.

    First, a brief overview is given about the photosensitivity in optical fibre, basic FBG fabrication techniques, the popular coupled-mode theory for describing fundamental characteristics of FBGs and the Transfer Matrix method for the numerical simulations of complex-structured FBGs.

    An advanced FBG fabrication system based on the technique of multiple printing in fibre (with a continuous-wave source) has been used to write complex FBGs incorporating phase shifts, apodization and chirp.     

    A single double-peaked superimposed grating working in reflection can be employed as a direct optical filter for millimetre-wave signals. Bit error rate measurements confirmed that the filter exhibited nearly on-off behaviour in the passband with a 3-dB bandwidth of 2 GHz for a central frequency of 20 GHz, as expected from the optical spectrum reflection. The presented technique can be used in radio-over-fibre systems or simultaneous up-conversion of ultra-wide band signals and filtering.

    This thesis focused mostly on the research of two 4-cm long Hamming-apodized gratings written in side-hole fibres with internal electrodes. The temperature dependence measurements showed that the birefringence of the component increased with the temperature. Dynamic measurement has shown nanosecond full off-on and on-off switching. During the electrical pulse action, the grating wavelength was blue-shifted for the x-polarization and red-shifted for the y-polarization due to the mechanical stress. 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. All the wavelength shifts of the two polarizations depend quadratically on the electrical pulse voltage and linearly on the pulse duration. Numerical simulations gave accurate description of the experimental results and were useful to understand the physics behind the birefringence switching.

    Finally, two switchable dual-wavelength erbium-doped fibre lasers based on FBG feedback were proposed. In one method, an overlapping cavity for the two lasing wavelengths and hybrid gain medium in the fibre laser were introduced. Dual-wavelength switching was achieved by controlling the Raman pump power. The other method employed an injection technique and the dual-wavelength switching was controlled by the power of the injection laser. The switching time was measured to be ~50 ms. Detailed characteristics of the dual-wavelength switching in the two fibre lasers were experimentally studied and corresponding principles were physically explained.

  • 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), 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.

  • 17.
    Yu, Zhangwei
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Knape, Harald
    Tarasenko, Olesandr
    Koch, Ralf
    Margulis, Walter
    All-fiber single-pulse selection and nanosecond gating2009In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 34, no 7, p. 1024-1026Article in journal (Refereed)
    Abstract [en]

    Two functions normally attributed to Pockels cells are performed with internal-electrode microstructured fiber components. Single-pulse selection out of a 100 MHz mode-locked pulse train is demonstrated using all-fiber nanosecond polarization rotation. Additionally, off-on-off gating with duration similar to 13 ns is achieved with a polarization rotator made out of a four-hole silicate fiber.

  • 18.
    Yu, Zhangwei
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Sterner, C.
    Tarasenko, O.
    Margulis, Walther
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Fonjallaz, P. -Y
    Dynamics of long-period gratings tuned with internal fiber electrodes2011In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 36, no 5, p. 633-635Article in journal (Refereed)
    Abstract [en]

    The physics of electrically switched long-period grating in a twin-hole fiber with internal electrodes is studied. Dynamic measurements for the two polarizations show how the grating spectra shift in time due to the mechanical stress and heat transfer in the core and the cladding.

  • 19.
    Yu, Zhangwei
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, O.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Actively Q-switched all-fiber laser with an electrically controlled microstructured fiber2010In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, no 11, p. 11052-11057Article in journal (Refereed)
    Abstract [en]

    Actively Q-switching of an all-fiber laser system is demonstrated. The active element is a polarization switch with nanosecond risetime based on a microstructured fiber with electrically driven internal electrodes. Optical feedback between two 100% reflectors is inhibited until a nanosecond current pulse Q-switches the laser. After a short optical pulse develops several roundtrips later, the fiber switch is turned off, removing the short optical pulse from the cavity through a polarization splitter. Pulses of 50 W peak power and similar to 12 ns duration are obtained with 400 mW pump power at 100 Hz. (C) 2010 Optical Society of America

  • 20.
    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.

  • 21.
    Yu, Zhangwei
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Acreo AB, Kista, Sweden .
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Acreo AB, Kista, Sweden .
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Acreo AB, Kista, Sweden .
    Tarasenko, O.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Acreo AB, Kista, Sweden .
    Q-switching a fiber laser with an electrically controlled microstructured fiber2010In: Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010, 2010, p. 5500945-Conference paper (Refereed)
    Abstract [en]

    A monolithic fiber laser incorporating an electrically driven microstructured fiber is Q-switched exploiting nanosecond polarization rotation and multi-pass amplification. All components are in-fiber, simplifying fabrication and improving robustness.

  • 22.
    Yu, Zhangwei
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, O.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    All-fiber laser cavity dumping2009In: 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS, IEEE , 2009, p. 463-464Conference paper (Refereed)
    Abstract [en]

    Cavity dumping of a fiber laser is demonstrated. A microstructured fiber with an electrically driven internal electrode is used for intracavity polarization rotation with nanosecond risetime. The optical flux can be dumped within one roundtrip.

  • 23.
    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.

  • 24.
    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.

  • 25.
    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 - 25 of 25
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