OSA (FiO/LS) 2015 Takumi Kato

Related to Kerr frequency comb
FM1D.2 Stabilized on-chip optical frequency combs *UCLA Chee Wei Wong et al.
Report on comb generation using SiN rings. Although there have been many studies on the stabilization of car comb, it has not been an on-chip proposition. In this study, a small car comb (several tens of GHz) with FSR was generated, and high stability was obtained while interfering with menlo's fiber comb. The fact that the UCLA group presented a car comb was more noteworthy than the content of the paper.

FM2D.3 Towards Automated Deterministic Comb Generation in Microresonators: Overcoming Thermal shift *Purdue Univ. Weiner et al.
This is a report on how to lead a CURCOM to a soliton state without fail. The authors focused on the fact that the oscillation of the internal power of the resonator in the chaotic state makes the subsequent state uncertain, and investigated the conditions under which the soliton state can be achieved while avoiding the chaotic state. Since thermo-optic effects were not included in the simulation, we focused on how to avoid the effects of thermo-optic effects in the experiment.

FTu3E.2 Quantum cascade laser Kerr frequency comb generation *EPFL Kippenberg et al.
A report on a car comb aiming at a comb light source in the mid-infrared band. The resonator is MgF₂Resonator. The pump light is a quantum cascade laser. The evanescent coupler is a chalcogenide fiber. The SiN ring method is also being studied, and they are also working on some modifications to adapt it to the mid-infrared band, but no experimental results have been obtained yet.

FW3C.1 Broadband Frequency Combs on a Photonic Chip Using Soliton Induced Cherenkov Radiation *EPFL Kippenberg et al.
A report on car comb using SiN ring. The content of the presentation was very typical in the field of carcom, such as realization of broadband comb using dispersive waves, absolute measurement of carrier-envelope-offset using 2f-3f, etc. The most interesting part of the presentation was the collapse of spectra due to mode crossing. The most interesting topic was the collapse of the spectrum due to mode crossing. For example, even if an ideal soliton is obtained when only the first-order mode of TE is considered, the spectrum will collapse if some longitudinal mode crosses with the second-order mode of TE. Therefore, the design should avoid mode crossing as much as possible. On the other hand, for dispersion design, it is not possible to stick to the single-mode condition, for example, by making the waveguide wider, so it is recognized that mode crossing is unavoidable to some extent. It is said that experimental research is being conducted to create single-mode conditions by thinning a portion of the waveguide. Theoretically, only single-mode crossings will exist, just like in tapered fibers. If the same phenomenon occurs as in tapered fibers, it may lead to the atomic trapping using broad evanescent light and the generation of single photons from them, which are also being studied using tapered fibers.

FW6C.5 Octave-spanning microcavity Kerr frequency combs with harmonic dispersive-wave emission on a silicon chip *NIST Diddams, Papp, Srinivasan et al.
A post-deadline presentation, which I could not attend, reports on the observation of a comb with a dispersion range of 1~2 µm using a SiN ring. One of the innovations is that the wavelengths at which dispersive-waves are generated are designed to be around 1 µm and 2 µm. Another innovation is the tuning of the coupling between the waveguide and the resonator. Normally, only the coupling at the pump wavelength is considered, while other wavelengths tend to be ignored. In fact, we have observed a combs with a spread of 1~2 µm with a 1550 nm pump, but it seems that soliton formation has not yet been achieved.