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    1. Mentioned In 25 Articles

    2. Swept light source and method for controlling the same

      Swept light source and method for controlling the same
      Provided is a swept light source including one end surface coupled to a wavelength filter constituted of a diffraction grating and an end mirror via a light deflector and another end surface including a gain medium facing an output coupling mirror and which configures a laser cavity between the end mirror and the output coupling mirror, wherein a drive voltage having an AC voltage on which a DC bias voltage ...
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      Mentions: NTT
    3. Voltage Noise and Jitter Analysis for Swept Source Optical Coherence Tomography using KTa1-xNbxO3 Deflector

      Voltage Noise and Jitter Analysis for Swept Source Optical Coherence Tomography using KTa1-xNbxO3 Deflector
      This paper describes voltage noise and jitter analysis for the depth deviation of a point spread function in a swept source optical coherence tomography system using a KTa1-xNbxO3deflector. An interference waveform with voltage noise and jitter was simulated according to a previous report. Typical values for the voltage noise VTYPand jitter tTYPwere also obtained from a previous report and experiment. It was determined that the depth deviation is limited by ...
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      Mentions: NTT
    4. Stable wavelength-swept light source designed for industrial applications using KTN beam-scanning technology

      Stable wavelength-swept light source designed for industrial applications using KTN beam-scanning technology
      Using light-beam scanning technology based on a potassium tantalate niobate (KTa 1-x Nb x O 3 , KTN) single crystal, we constructed a wavelength-swept light source for industrial applications. The KTN crystal is placed in an external cavity as an electro-optic deflector for wavelength scanning without any mechanical operation. Cavity arrangement and mechanism elements are specially designed for long-term stability and environmental robustness. In addition, we updated the handling of the ...
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    5. High frame-rate en face optical coherence tomography system using KTN optical beam deflector

      High frame-rate en face optical coherence tomography system using KTN optical beam deflector
      We developed high frame-rate en face optical coherence tomography (OCT) system using KTa 1-x Nb x O 3 (KTN) optical beam deflector. In the imaging system, the fast scanning was performed at 200 kHz by the KTN optical beam deflector, while the slow scanning was performed at 800 Hz by the galvanometer mirror. As a preliminary experiment, we succeeded in obtaining en face OCT images of human fingerprint with a ...
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    6. Wavelength swept light source

      Wavelength swept light source
      A wavelength swept light source includes a sawtooth waveform as a main waveform and an exponential component of the sawtooth waveform to the controlled voltage of the electro-optic deflector. The controlled voltage is controlled so that, as an oscillation wavelength to be swept is swept towards a longer wavelength side, a change rate of the oscillation wavelength is increased.
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      Mentions: NTT
    7. Three-dimensional high-speed optical coherence tomography system using KTN swept light source

      Three-dimensional high-speed optical coherence tomography system using KTN swept light source
      Three-dimensional (3D) optical coherence tomography (3D-OCT) has attracted attention for visualising complex structures in the biomedical field. In this reported work, a high-speed 3D-OCT system is developed, which is based on a high-speed swept light source and aMach-Zehnder interferometer with a high-speed photodetector. The light source, incorporating a KTa 1-x Nb x O 3 electro-optic deflector, operates at a repetition rate of 200 kHz and enables high-speed data acquisition. As ...
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    8. High-Speed Optical Coherence Tomography System Using a 200-kHz Swept Light Source with a KTN Deflector

      High-Speed Optical Coherence Tomography System Using a 200-kHz Swept Light Source with a KTN Deflector
      We demonstrate a high-speed swept-source optical coherence tomography (SS-OCT) system, which is based on a high- speed swept light source and a Mach-Zehnder interferometer with a high-speed photodetector. The light source is an external-cavity laser tuned by a KTN electro-optic deflector, which exhibits a very fast response and large deflection. The scanning wavelength range is almost 80 nm up to 200 kHz with a 400-V deflector driving voltage. The system ...
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    9. 200 kHz swept light source equipped with KTN deflector for optical coherence tomography

      200 kHz swept light source equipped with KTN deflector for optical coherence tomography
      A new light source for swept-source optical coherence tomography (SSOCT) is presented, namely, an external-cavity LD equipped with a KTN electro-optic deflector. The KTN deflector is unique in being very fast and simultaneously providing an appreciable deflection caused by injected carriers.Being free frommechanical resonance, the 1.3 μm laser exhibits a scanning range of almost 80 nm up to 200 kHz with a + 400 V deflector driving voltage. Preliminary ...
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      Mentions: NTT Kazuo Fujiura
    10. Tomographic imaging using photonically generated low-coherence terahertz sources

      Tomographic imaging using photonically generated low-coherence terahertz sources
      This paper presents three-dimensional tomographic imaging system by using low-coherence terahertz (THz) sources. In contrast to conventional THz-pulse tomography with femtosecond pulse lasers, the proposed method requires compact and low-cost broadband optical signals such as amplified spontaneous emission (ASE) sources. Operation principle and the first experimental demonstration of tomographic imaging using 300-GHz-band sources are shown.
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    11. Mode-locked laser and optical multi-carrier source using same

      Mode-locked laser and optical multi-carrier source using same
      A mode-locked laser serves as a light source for stabilizing the frequency of each optical carrier and generates high-quality optical multi-carrier. The mode-locked laser is equipped with a master laser for generating master laser light; a mode-locked laser section including in an optical resonator at least a modulating section, am amplifying section, and a bandwidth limiting section for reducing mode partition noise; and a signal generating section for generating a ...
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      Mentions: NTT
    12. Coherence characterization of narrow-linewidth beam by C-OFDR based Rayleigh speckle analysis

      Coherence characterization of narrow-linewidth beam by C-OFDR based Rayleigh speckle analysis
      A novel method for characterizing the amplitude of a coherence function with respect to a delay between two optical waves is proposed and demonstrated by using a distributional Rayleigh speckle analysis based on C-OFDR. This technique allows us to estimate both the coherence time of the laser and that of the spectral profiles from the measured amplitude of the coherence function, if the symmetry of the spectrum can be assumed ...
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      Mentions: NTT
    13. 1-15 of 25 1 2 »
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  2. About NTT

    NTT

    NTT Advanced Technology. Electro-Optic laser beam scanners and a wide range of other products. NTT Advanced Technology is a subsidiary of NTT, the largest telecommunications service provider in Japan. NTT-AT is a technology integrator that brings to market the research results of NTT R&D Laboratories. NTT-AT offers high quality and innovative technology solutions, such as optical components, networking, media processing, environmental, and nano-component technologies in the information and communication fields

    NTT Electronics.  Broadband sources and other Optical and Electrical Components. NTT is a market leader in the fields of digital video, photonics and broadband networking. As a member of the NTT Group, one of the world's leading telecommunications companies, NTT Electronics develops and supplies LSI devices and equipment incorporating superior, state-of-the-art technology for video processing and communications