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  • 1.
    Klemming Eklöf, Finn
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yu, Zangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Rugeland, Patrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tjörnhammar, Staffan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Compact Three-wavelength Fiber Laser for Multi-wavelength Digital Holography2013In: Workshop on Specialty Optical Fiber and Their Applications, 2013Conference paper (Refereed)
    Abstract [en]

    A compact three‐wavelength narrow‐linewidth fiber laser with single pump is demonstrated. The multiple‐wavelength output signal can be effectively employed to synthesize large effective probing wavelength of up to 1.16mm for high depth resolution digital holography.

  • 2.
    Malmström, Mikael
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, O.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    All-fiber cavity dumping2009In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 17, no 20, p. 17596-17602Article in journal (Refereed)
    Abstract [en]

    Cavity dumping of an all-fiber laser system is demonstrated. The active element is a pulse-picker with nanosecond rise time consisting of a microstructured fiber with electrically driven internal electrodes. The device is used for intracavity polarization rotation and dumping through a polarization splitter. The optical flux is removed from the cavity within one roundtrip and most of the amplified spontaneous emission, spiking and relaxation oscillation that follow during the gain recovery phase of the laser are blocked from the output signal.

  • 3.
    Margulis, Walter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tarasenko, O.
    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.
    Electrically controlled fibers2012In: Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012, IEEE , 2012, p. 803-804Conference paper (Refereed)
    Abstract [en]

    Fibers with internal electrodes are driven electrically. They allow for the control of polarization, wavelength tuning, nanosecond light gating, Q-switching and mode-locking of lasers. These are some of the applications discussed in this paper.

  • 4.
    Margulis, Walter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Acreo, Kista, Sweden.
    Tarasenko, Oleksandr V.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Zhejiang University, China .
    Fonjallaz, P. -Y
    Knape, Harald
    High-speed fiber switches2008In: AIP Conference Proceedings, 2008, p. 23-25Conference paper (Refereed)
    Abstract [en]

    All-fiber optical switches based on fiber with electrodes exhibit transition times <10ns. The devices are monolithic and robust, they are simple and could potentially be manufactured at low cost. The insertion loss is extremely low and the devices are compatible with single mode fiber technology. Two types of switches are discussed, one based on polarization rotation, the other one relying on the wavelength shift of a fiber Bragg grating (FBG).

  • 5. Peng, Junsong
    et al.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Targeting different pulsing regimes in tm fiber laser with a nonlinear amplifying loop mirror2014In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2014Conference paper (Refereed)
  • 6.
    Peng, Junsong
    et al.
    KTH.
    Yu, Zhangwei
    KTH.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. KTH, School of Engineering Sciences (SCI), Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Physics. KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Targeting different pulsing regimes in Tm fiber laser with a nonlinear amplifying loop mirror2015In: Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015, Optical Society of America (OSA) , 2015, article id CJ_14_5Conference paper (Refereed)
  • 7.
    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.
    Sterner, Carola
    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.
    Photonic scanning receiver using an electrically tuned fiber Bragg grating2009In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 34, no 24, p. 3794-3796Article in journal (Refereed)
    Abstract [en]

    A 5-cm-long electrically tuned fiber Bragg grating is used to filter a microwave signal on an optical carrier at 1.55 µm. A chirped distributed-feedback structure is employed, with a transmission bandwidth of 54 MHz and relative optical carrier rejection of >30 dB for rf frequencies >2 GHz. The rapid monotonic sweep of the Bragg wavelength is translated into a fast-frequency sweep for rf analysis.

  • 8. Sterner, C.
    et al.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics. Acreo AB, Sweden.
    Tarasenko, O.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics. Acreo AB, Sweden.
    Electrically controlled long-period gratings for switching applications2010In: Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides (BGPP) 2010, 2010Conference paper (Refereed)
    Abstract [en]

    LPGs written in fibers with internal electrodes are tuned electrically in nanoseconds and the dynamics studied. Wavelength shifts -8 nm (4.5 dB transmission change for xpolarization) and +5 nm (3 dB for y-polarization) are measured.

  • 9.
    Tjörnhammar, Staffan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Klemming Eklöf, Finn
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Khodadad, Davood
    Department of Engineering Sciences and Mathematics, Luleå University of Technology.
    Hällstig, Emil
    Fotonic.
    Sjödahl, Mikael
    Department of Engineering Sciences and Mathematics, Luleå University of Technology.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Multiwavelength laser designed for single-frame digital holography2016In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 55, no 27, p. 7517-7521Article in journal (Refereed)
    Abstract [en]

    In this paper, we present a tailored multiwavelength Yb-fiber laser source in the 1.03 μm spectral region for spatially multiplexed digital holographic acquisitions. The wavelengths with bandwidths below 0.1 nm were spectrally separated by approximately 1 nm by employing fiber Bragg gratings for spectral control. As a proof of concept, the shape of a cylindrically shaped object with a diameter of 48 mm was measured. The holographic acquisition was performed in single-shot dual-wavelength mode with a synthetic wavelength of 1.1 mm, and the accuracy was estimated to be 3% of the synthetic wavelength.

  • 10. Xu, Z.
    et al.
    Fu, H.
    Cai, Z.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Microwave frequency multiplication based on double-pass modulation and fiber ring microwave photonic filters2013In: Progress In Electromagnetics Research Symposium Proceedings, Stockholm, Sweden, Aug. 12-15, 2013, 2013, p. 1169-1172Conference paper (Refereed)
    Abstract [en]

    In this article, a novel approach to generate high frequency multiplication microwave signal with double-pass modulation and fiber ring based microwave photonic filters (FRMPFs) is proposed and experimentally demonstrated. The results show that it's an effective way to generate high frequency signals with good tunability.

  • 11.
    Yu, Zhangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    interview: "Optofluidics are an interesting emerging research field combining microfluidics with optics on the micrometre scale'2016In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 52, no 19, p. 1576-1576Article in journal (Refereed)
  • 12.
    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.

  • 13.
    Yu, Zhangwei
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kabakova, I. V.
    Fonjallaz, P. -Y
    Tarasenko, O.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    De Sterke, C. M.
    Dynamic frequency tuning in a fiber grating cavity2013In: Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2012, 2013Conference paper (Refereed)
    Abstract [en]

    Dynamic frequency tuning of trapped light in a phase-shifted fiber grating cavity is demonstrated by high-voltage electrical pulses. Y-polarization light is found to be sensitive to refractive index changes caused by a transverse pressure-wave.

  • 14.
    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.

  • 15.
    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.
    A tunable all-fiber laser based on a stress-optic phase modulator and a chirped fiber Bragg grating2015In: Workshop on Specialty Optical Fibers and their Applications, WSOF 2015, 2015Conference paper (Refereed)
    Abstract [en]

    A tunable single-wavelength Erbium-doped all-fiber laser was experimentally demonstrated. The tuning is obtained with a stress-optic phase modulator based on a twin-hole fiber and a chirped fiber Bragg grating in a medium birefringence fiber. © OSA 2015.

  • 16.
    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.

  • 17.
    Yu, Zhangwei
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Acreo Swedish ICT AB, Stockholm, Sweden .
    Rugeland, Patrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Acreo Swedish ICT AB, Stockholm, Sweden .
    Kabakova, I. V.
    Fonjallaz, P. -Y
    Tarasenko, O.
    De Sterke, C. M.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Acreo Swedish ICT AB, Stockholm, Sweden .
    Dynamic wavelength switching in a fiber grating cavity2013In: 2013 Conference on Lasers and Electro-Optics, CLEO 2013, IEEE Computer Society, 2013, p. 6833424-Conference paper (Refereed)
    Abstract [en]

    Dynamic wavelength switching of a phase-shifted fiber grating cavity with electrical pulses is studied experimentally and numerically. Simulations accurately describe observations. The effect of acoustic oscillations and fiber Bragg grating cavity refilling explains the results.

  • 18.
    Yu, Zhangwei
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Stjernström, Mårten
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    High-aspect ratio microchannels fabricated in fused silica hollow fibres using Tesla coil2016In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 52, no 19Article in journal (Refereed)
    Abstract [en]

    A novel method to fabricate microchannels into fused silica capillaries and hollow fibres by a high-voltage high-frequency corona discharge induced by a Tesla coil is demonstrated. Channels as narrow as 2.2 m are successfully made in capillaries with 2 m inner and 125 mu m outer diameters.

1 - 18 of 18
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