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We experimentally demonstrate an arbitrary optical higher order QAM generation using single stage nonlinear element and Kerr frequency comb. We successfully generated 80-Gbit/s 16-QAM and 120Gbit/s 64-QAM at EVM of 6.5% and 5.5% by multiplexing two and three 40-Gbit/s QPSK signals, respectively.
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...
Integrated microresonators are essential building blocks of linear and nonlinear photonic devices. Here we show that the performance of high-Q silicon nitride microresonators for nonlinear photonics strongly depends on the ideality of their coupler design.
Frequency comb generation based on dissipative Kerr solitons (DKS) in microresonators is important for many applications. We show higher order mode suppression in silicon nitride microresonators, that reduces avoided modal crossing to enable DKS generation.
An approach for a low-power chip-scale package is described, that provides a laser output with a programmable frequency across 50 nm of bandwidth centered at 1550 nm, and a resolution of one part in 1014.
Microresonator based optical frequency combs have the potential to greatly extend optical frequency measurements. Here we demonstrate the first self-referenced microresonator based optical comb suitable for optical frequency metrology applications.
Integrated microresonators based on SiN waveguides are an attractive platform for nonlinear optics. Here we present a new photonic Damascene fabrication process that solves common problems in SiN waveguide fabrication and demonstrate frequency comb formation.
We show for the first time a fully coherent frequency comb generated in a SiN photonic chip which spans 2/3 of an octave using solitons and soliton induced Cherenkov radiation. Additionally we stabilize the spectrum.
Temporal dissipative solitons in microresonators constitute a novel class of ultra-short optical pulse generators. Here we study the influence of resonator mode-structure, particularly avoided mode crossings, on soliton formation and derive resonator design criteria.
We demonstrate temporal dissipative soliton generation in silicion nitride microresonators for the first time. Temporal soliton states allow for low-noise RF-generation, smooth frequency comb spectra and produce ultra-short optical pulses on a chip.
Since their discovery, microresonator frequency combs have made considerable progress [1]. Octave spanning combs [2,3], data transmission applications [4] and mode-locking [5,6] have been demonstrated. There have also been advances in understanding the properties and the generation process of the frequency combs inside the resonators [7].
We demonstrate spectral broadening of a low noise microresonator based near-infrared frequency comb to almost two thirds of an octave as required for self-referencing. The low noise properties of the unbroadened spectrum are preserved.
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