FiO 2017 Ryo Suzuki

FM3A.2: Connecting visible and telecommunications wavelengths with silicon nitride nanophotonics

Dr. Srinivasan's group at NIST presented that pumping a Si3N4 ring resonator with a 930 nm laser produced wavelength conversion to the 1550 and 660 nm bands via degenerate four-wave mixing. Since the wavelengths of the Signal and Idler beams are very different, the coupling waveguide is optimized to be 2.5 nm and 1.5 nm, respectively. The wavelengths of Signal and Idler light are very different, so the coupling waveguide is divided into two paths optimized for each.

FTu4E.4: Automotive LiDAR: Challenges and Opportunities

Dr. Maleki, who is famous for his research on whispering-gallery-mode resonators, introduced LiDAR research for automated driving technology. LiDAR, in particular, has various problems such as performance, cost, and feasibility. For example, in terms of performance, the range of distance, angular resolution, and information processing load and speed, and in terms of cost, the devices need to be kept at around $100 (the presenter used GPS as an example and hoped to lower the price, as it has done in the past). The LiDAR has a Direct detection LiDAR. The former simply detects an object by the time it takes for a laser beam to be emitted and for the reflected light to return. The latter uses FMCW (Frequency modulated continuous wave) to measure the beat signal and obtain the detection and velocity of an object with a high signal-to-noise ratio. Dr. Maleki has shown that this light source can be realized with a whispering-gallery-mode resonator, and that a narrow-line resonator can be used to measure the frequency modulated continuous wave. LiDAR is a hot topic that is beginning to attract worldwide research interest.

FTu5A.3: Multispectral optical frequency comb based on microresonator Faraday instability

The presentation was given by Prof. Wong's group, which has recently started (and reported) research related to Kerr comb. The present study showed that four-wave mixing can be generated in order-shifted modes (m±n+1 or m±n-1) by satisfying wavenumber conservation. The resonator is a Si3N4 ring. A Si3N4 ring resonator was used as the resonator, and conversion to 1300 nm and 2000 nm was confirmed for a 1580 nm pump.