Abstract
Frequency combs provide a set of equidistant laser lines and find applications in many areas [1]. Microresonator based Kerr frequency combs are a recent scheme for frequency comb generation promising chip-level integration and novel applications such as coherent terabit telecommunications [2, 3]. The underlying principle is nonlinear frequency conversion of a continuous wave pump laser in a high finesse microresonator. Recently the excitation of dissipative Kerr solitons (DKS) and dispersive wave (DW) formation within the resonator has provided a path to fully coherent Kerr frequency combs with engineered bandwidth [4, 5]. Attaining spectral coverage exceeding one octave is key for several applications like self-referencing via f-2f-interferometry. Although octave spanning Kerr combs have been reported, exciting fully coherent DKS based frequency combs with octave bandwidth has remained challenging.
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