Spectral interferometry-based chromatic dispersion measurement of fibre including the zero-dispersion wavelength

Abstract

We report on a simple spectral interferometric technique for chromatic dispersion measurement of a short length optical fibre including the zero-dispersion wavelength. The method utilizes a supercontinuum source, a dispersion balanced Mach-Zehnder interferometer and a fibre under test of known length inserted in one of the interferometer arms and the other arm with adjustable path length. The method is based on resolving one spectral interferogram (spectral fringes) by a low-resolution NIR spectrometer. The fringe order versus the precise wavelength position of the interference extreme in the recorded spectral signal is fitted to the approximate function from which the chromatic dispersion is obtained. We verify the applicability of the method by measuring the chromatic dispersion of two polarization modes in a birefringent holey fibre. The measurement results are compared with those obtained by a broad spectral range (500-1600 nm) measurement method, and good agreement is confirmed.

Measurement of higher order chromatic dispersion in a photonic bandgap fiber: comparative study of spectral interferometric methods

“…(6) is fulfilled by the other condition. The sinΦω 0 condition gives the positions of the intensity minima and maxima [15,[17][18][19][20]. The extreme points are formed at the frequencies where the phase Φ is equal to π times a whole number.…”

“…One of the most common evaluation methods is the stationary phase point (SPP) method [13], which is often used for dispersion characterization of optical elements but also applicable for fibers [14][15][16]. Another method is the minima-maxima (MM) [15,[17][18][19][20], which has been already used to measure the dispersion of photonic crystal fibers by Jasapara et al [17] The so-called cosine function fit (CFF) method [21,22], which relies on fitting a phase modulated cosine function to the normalized interferogram, has also been successfully used to measure the dispersion and refractive index of microstructured [21] and photonic crystal fibers [22]. Another alternative is the Fourier-transform (FT) method [23][24][25][26][27][28][29][30], which is a widely used technique for determining the dispersion of mirrors and glass slabs [24,25] but also finds its application in measuring the spectral phase of microstructured [27] and dispersion compensating fibers [29].…”

Multi-milliwatt mid-infrared supercontinuum generation in a suspended core chalcogenide fiber

“…Matching the optical path delay of the two arms gives rise to an interference pattern. By fitting the position of fringe peaks and valleys to a modified Cauchy dispersion equation the dispersion of the fundamental mode can be extracted [41]. The measured dispersion from 2.9-4.2 μm, which represents the average over several measurements, is shown as the solid red curve in Fig.…”

Stress-Loss Correlation and Dispersion Control in Highly GeO2-Doped Fibers

“…Dispersion in the fiber was experimentally measured using spectral interferometry technique [17] and was found to be <20 ps/Km·nm in the region of 1.4-1.6 μm. The zero dispersion wavelength was measured to be around 1.59 μm and the dispersion was expected to remain low till 3 μm.…”