Design and fabrication of dispersion controlled highly nonlinear fibers for far-detuned four-wave mixing frequency conversion

Abstract

We report on the conception, fabrication and characterization of a new concept of optical fiber enabling a precise control of the ratio between the 2nd and 4th-order of chromatic dispersion (respectively β2 and β4) at 1.55 µm which is at the heart of the Four-Wave-Mixing (FWM) generation. For conventional highly nonlinear fiber the sensitivity of this ratio to fiber geometry fluctuations is very critical, making the fabrication process challenging. The new design fiber reconciles the accurate control of chromatic dispersion properties and fabrication by standard stack and draw method, allowing a robust and reliable method against detrimental fluctuations parameters during the fabrication process. Experimental frequency conversion with FWM in the new design fiber is demonstrated.

Dual-comb spectrometer in the two-micron region using a new design of dispersion-controlled highly nonlinear fibre

“…Based on this observation, a new fibre design has been proposed to control more efficiently this ratio [6]. The starting point of this fiber is a W-type fiber design, depicted in Fig.…”

Near-Infrared Dual-Comb Spectroscopy of CO2 and N2O with a Discretized Highly Nonlinear Fiber

“…Down-conversion of frequency combs from 1.55 μm to around 2 μm is achieved via degenerate four-wave mixing (FWM) 27−29 in a discretized highly nonlinear fiber (D-HNLF) of an original design, which allows precise control of its dispersion parameters. 30 In fact, the frequency shift induced by FWM is highly dependent on the values of the second-and fourth-order dispersion coefficients, hence the need for precise control of these two parameters. On the other hand, the D-HNLF effectively reduces fluctuations in the dispersion coefficients along the fiber, thereby enhancing the efficiency of nonlinear conversion.…”

“…In this study, we demonstrate the efficiency of an all-fiber dual-comb spectrometer operating in the two-micron band. Down-conversion of frequency combs from 1.55 μm to around 2 μm is achieved via degenerate four-wave mixing (FWM) − in a discretized highly nonlinear fiber (D-HNLF) of an original design, which allows precise control of its dispersion parameters . In fact, the frequency shift induced by FWM is highly dependent on the values of the second- and fourth-order dispersion coefficients, hence the need for precise control of these two parameters.…”

Inverse design of photonic crystal fiber for four-wave-mixing application

“…Up to now, PCFs with the tunable zero-group-dispersion wavelength, ultra-flattened dispersion 2 have been studied. Thus, PCF is a favorable medium to efficiently acquire various nonlinear optical effects, such as four-wave-mixing (FWM) 3 . FWM in PCF permits a broad band of nonlinear wavelength conversion by delicately designing the dispersion of PCF 4 .…”