Integrated optical ultrashort-pulse picker with high extinction ratio

Ruske, J.-P.; Werner, Ekkehard; Zeitner, B.; Tünnermann, Andreas

doi:10.1049/el:20030959

Cited by 8 publications

(1 citation statement)

References 6 publications

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“…One important factor for an optical switch is the ON/OFF ratio (extinction ratio), which is expressed as the ratio of two optical power levels of a digital signal generated by an optical source, for example, a laser diode. Typical extinction ratio for commercial products using AO or EO modulations are ranging from 15 to 45 dB [14, 15]. Figure 3 shows the extinction ratio as a function of applied LD (LD2 in Figure 1b) current in this study.…”

Section: Resultsmentioning

confidence: 99%

Optical switch by direct modulated laser diode using fiber laser for pulse picking

Kaneko

Yasui

Kurouchi

et al. 2023

The Journal of Engineering

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A new method of direct modulating a pre-amplifier laser diode as an optical switch is proposed. To modulate the laser diode with lower repetition rate, the repetition rate in the kilohertz region can be achieved using a source laser of 100 MHz without electro-optical modulators (EOM) or acousto-optical modulators (AOM). Using a direct modulated laser diode, an ON/OFF ratio (extinction ratio) of 25 dB was demonstrated in this study.

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Section: Resultsmentioning

confidence: 99%

Optical switch by direct modulated laser diode using fiber laser for pulse picking

Kaneko

Yasui

Kurouchi

et al. 2023

The Journal of Engineering

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Near-Infrared Fiber Imager for the VLTI

Neuhäuser¹,

Tünnermann²,

Hempel³

et al.

The Power of Optical/Ir Interferometry: Recent Scientific Results and 2nd Generation Instrumentation

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Abstract.For detection of massive close-in exo-planets around other stars, a contrast of ∼ 0.3% is sufficient and can be achieved with state-of-the-art single-mode fibers as spatial filter. For lower-mass planets, much higher accuracy is neccessary. Apart from the atmosphere, there are several sources of noise which degrade the phase stability of interferometers based on bulk optics by changes in the optical path. For direct detection of low-mass exo-planets and for direct observation of convection on giant stars, our two main science goals, as well as for secondary science goals such as lower-mass faint circumstellar disks around both nearby low-mass stars as well as more distant high-mass stars and for the direct detection of close spectroscopic binary (T Tauri) stars and to follow their orbits for direct dynamical mass determination, we need more than two apertures to fill the uv-plane, again very complicated with bulk-optics. Integrated optics allows to solve these problems and to minimize the components. We have experiences in the development and fabrication of integrated-optical circuits and modulators in various wavelength ranges, i.e. from visible to the telecommunication band, as well as integrated-optical sensor systems like interferometers. Starting from two channel interferometers for the J-band at 1.55µm based on Lithiumniobat, we will develop multichannel-interferometer systems for longer wavelengths. Such systems with new materials and fibers for the near-and thermal infrared can then be used, e.g., for 2nd Gen VLTI instrumentation.

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Modelocked semiconductor laser system with pulse picking for variable repetition rate

Balzer

Schlauch

Hoffmann

et al. 2011

Electronics Letters

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Integrated optical ultrashort-pulse picker with high extinction ratio

Abstract: An integrated optical Mach-Zehnder modulator in lithium niobate was used for pulse picking of a 140 fs laser oscillator at 1064 nm with 76 MHz repetition rate. A maximum extinction ratio of about 1000:1 was demonstrated at a peak power of about 120 W

Cited by 8 publications

References 6 publications

Optical switch by direct modulated laser diode using fiber laser for pulse picking

Optical switch by direct modulated laser diode using fiber laser for pulse picking

Near-Infrared Fiber Imager for the VLTI

Modelocked semiconductor laser system with pulse picking for variable repetition rate

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