Evaluation of a time-frequency domain interferometer for simultaneous group-velocity dispersion measurements in multimode photonic crystal fibers

Böswetter, Pascal; Baselt, Tobias; Ebert, Frank; Basan, Fabiola; Hartmann, Péter

doi:10.1364/ao.50.000e32

Cited by 11 publications

(3 citation statements)

References 10 publications

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“…The group-velocity dispersion (GVD) of different modes was experimentally measured using a Mach-Zehnder interferometer with a controllable delay line to investigate the time delay and find the equalization wavelength for different modes (Figure 1) [12,15]. A camera at the free output of the second polarization-independent beam splitter allowed control over the near field pattern of the analyzed guided modes.…”

Section: Characterization Of Group-velocity Dispersionmentioning

confidence: 99%

Supercontinuum Generation in the Cladding Modes of an Endlessly Single-Mode Fiber

et al. 2019

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In photonic crystal fibers, light guidance can be achieved by a central defect of a periodic structure of air holes in a silica glass matrix and the dispersion can be adjusted over a wide spectral range to enhance nonlinear effects. By coupling short pulse laser radiation into the core with tight confinement and utilizing the nonlinear properties of glass, this radiation can be converted to a broad spectral distribution. The tight confinement puts limits on the maximum pulse fluence propagating in the core due to the damage threshold of the glass. Therefore, when higher power spectral densities are desired, it is favorable to spread the generation of light over a much larger area to prevent fiber damage. We present here a method for generating a supercontinuum using the cladding modes of an endlessly single-mode fiber. These modes generate a supercontinuum utilizing a multimodal quasi-continuum of states, for which dispersion is governed by the guiding properties of the material between the air-filled holes in the cladding. The system also provides experimental access to unique phenomena in nonlinear optics. Simulations of the propagation properties of the core mode and cladding modes were compared with measurements of the group-velocity dispersion in a modified white-light Mach–Zehnder interferometer. The coupling of similar laser parameters into the cladding of the photonic crystal fiber enables a significant increase in conversion efficiency in the visible spectral range compared with the core-pumped case.

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Section: Characterization Of Group-velocity Dispersionmentioning

confidence: 99%

Supercontinuum Generation in the Cladding Modes of an Endlessly Single-Mode Fiber

et al. 2019

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“…As an alternative way to determine dispersion a combined approach of time and frequency domain interferometry was proposed originally for the characterization of photonic crystal fibers, [19]. A Michelson based variant of this approach to white light interferometry was set up in order to evaluate the dispersion properties of epoxy-based polymers, Fig.…”

Section: Experimental Setup and Samplesmentioning

confidence: 99%

“…Other works have shown that this approach is a fast and suitable method in characterizing dispersion in fibers of a few centimeters length as opposed to several ten meters, as in other approaches, [19]. However it still is a challenge to characterize much smaller thicknesses of materials like a few micron thick layer of photo resist material.…”

Section: Experimental Setup and Samplesmentioning

confidence: 99%

Investigation of a novel approach for the cross-linking characterization of SU-8 photoresist materials by means of optical dispersion measurements

et al. 2014

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The increase in efficiency and precision in the production of semiconductor structures under the use of polymeric materials like SU-8 is crucial in securing the technological innovation within this industry. The manufacturing of structures on wafers demands a high quality of materials, tools and production processes. In particular, deviations in the materials' parameters (e.g. cross-linking state, density or mechanical properties) could lead to subsequent problems such as a reduced lifetime of structures and systems. In particular problems during the soft and post-exposure bake process can lead to an inhomogeneous distribution of material properties. This paper describes a novel approach for the characterization of SU-8 material properties in relation to a second epoxy-based material of different cross-linking by the measurement of optical dispersion within the material. A white-light interferometer was used. In particular the setup consisted of a white-light source, a Michelson-type interferometer and a spectrometer. The investigation of the dispersion characteristics was carried out by the detection of the equalization wavelength for different positions of the reference arm in a range from 400 to 900 nm. The measured time delay due to dispersion ranges from 850 to 1050 ps/m. For evaluation purposes a 200 µm SU-8 sample was characterized in the described setup regarding its dispersion characteristics in relation to bulk epoxy material. The novel measurement approach allowed a fast and high-resolution material characterization for SU-8 micro structures which was suitable for integration in production lines. The outlook takes modifications of the experimental setup regarding on-wafer measurements into account.

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Novel Method for the Measurement of Chromatic Dispersion of Photonic Crystal Fibers

Jiang

Ding

Wang

2013

IEEE Photon. Technol. Lett.

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Evaluation of a time-frequency domain interferometer for simultaneous group-velocity dispersion measurements in multimode photonic crystal fibers

Cited by 11 publications

References 10 publications

Supercontinuum Generation in the Cladding Modes of an Endlessly Single-Mode Fiber

Supercontinuum Generation in the Cladding Modes of an Endlessly Single-Mode Fiber

Investigation of a novel approach for the cross-linking characterization of SU-8 photoresist materials by means of optical dispersion measurements

Novel Method for the Measurement of Chromatic Dispersion of Photonic Crystal Fibers

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