Abstract
Low propagation loss Ge23Sb7S70 waveguides (0.56 dB/cm) are fabricated in a wafer scale process. Simulation of a 2 cm long, 1.2 μm wide waveguide with 100 ps/nm/km peak dispersion predicts coherent supercontinuum generation at 1.55 μm pump wavelength. Octave-spanning supercontinuum using a dispersive wave is experimentally demonstrated using picojoule-level energy (26 pJ, 240 fs pulse width, 77 W peak power) pulses.
Highlights
Supercontinuum generation as a way of generating optical frequency combs has gained significant interest in the past two decades with the invention of the f − 2 f self-referencing technique [1, 2]
In the 1 μm–2 μm spectral region, which is of interest because of the readily available and efficient semiconductor sources at 1.55 μm telecommunication wavelength, extensive research on supercontinuum generation has been done on silicon nitride based platforms
By careful engineering of waveguide dispersion, we demonstrate octave-spanning supercontinuum pumped at 1.55 μm with picojoule-level pulse energy
Summary
Supercontinuum generation as a way of generating optical frequency combs has gained significant interest in the past two decades with the invention of the f − 2 f self-referencing technique [1, 2]. Octave-spanning supercontinua and frequency combs have been demonstrated in a broad range of materials and wavelength regions. In the 1 μm–2 μm spectral region, which is of interest because of the readily available and efficient semiconductor sources at 1.55 μm telecommunication wavelength, extensive research on supercontinuum generation has been done on silicon nitride based platforms Both conventional supercontinuum generation waveguides and optical ring resonators have been demonstrated to generate frequency combs spanning more than one octave [9,10,11] with pulse energies on the order of less than 100 pJ and 100 fs pulse widths. As2S3 based waveguides were used to demonstrate low-power supercontinuum generation in the 1 μm–2 μm wavelength range, with a −30 dB bandwidth close to one octave [13]. The simulated dispersion using a finite difference mode solver for a waveguide with the same dimensions (1.8 μm wide rib waveguide) is shown as a reference, with good agreement over the C and L band for both TE and TM modes, indicating that the material dispersion model is accurate
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