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We report cascaded four-wave mixing in a silicon micro-ring resonator operating at 4.5 μm wavelength. Our results present an important milestone for extending optical frequency combs further into the mid-infrared range.
A hybrid silicon ring laser in which the counter-clockwise circulating power is coupled into the clockwise mode is demonstrated. Unidirectional clockwise laser output is achieved with a suppression ratio of 19 dB over the counter-clockwise mode.
Reported here is a method for trimming the resonant frequency of microring resonators by permanent thermal modification of a waveguide cladding. This method would use in-situ heaters, avoiding the need for highly specialized equipment.
We demonstrate a thermo-optic switch comprising a 3.78μm-long coupled photonic crystal resonators coupled to a photonic crystal waveguide. The device has 6nm optical bandwidth, 20dB optical extinction ratio, 18.2mW switching power, and 14.8μsec rise time.
We report on ZnGeP2-based parametric sources pumped by holmium lasers which are resonantly pumped by thulium fiber lasers. Using this scheme, we have built one source with up to 22 W average power and another with more than 0.2 J pulse energy in the mid-infrared region.
We propose a new implementation of a QPSK modulator using a simple single ring resonator. That requires only < π/10 phase shift. Signal generated have a better dispersion tolerance than from a single phase modulator.
Dye-doped polymer fiber networks fabricated with electrospinning exhibit comb-like laser emission. We identify randomly distributed ring resonators being responsible for lasing emission by making use of spatially resolved spectroscopy. Numerical simulations confirm this result quantitatively.
We present a novel all-optical light tracker by taking advantage of the nonlinear optomechanical signal amplification and modulation, which can transfer the information carried by a signal light to tracking light without electro-optical converting.
We demonstrate the first integrated switch for mode-division multiplexing (MDM) and wavelength-division multiplexing (WDM). We show on-chip routing of four 10 Gb/s channels with <-20 dB crosstalk and 0.5–1.4 dB power penalty.
We demonstrate an on-chip optical spectrum analyzer (OSA) using two cascade optical ring resonators. The OSA's span is wider than 50nm and resolution is ∼0.1nm. A germanium photodetector and a p-i-n modulator are integrated on the chip and used for detection.
We devised a new output configuration for the Si-SOA hybrid laser which is suitable for high-power operation in terms of slope efficiency and suppression of nonlinear effects in a ring resonator. These advantages were theoretically evaluated. A proof-of-concept experiment demonstrated output power of > 7 mW and tunable operation with a range of 4.8 THz.
We present an experimental demonstration of a metasurface analogue of electromagnetically induced transparency based on silicon instead of lossy plasmonic metal, therefore achieved a record-high quality factor of 483 and a sensing figure-of-merit of 103.
We demonstrate an effective technique which allows one to characterize a small radius micro-ring resonator via low coherence interferometric measurement beyond light source bandwidth limitation. The experimental results show significant improvements in the extracted parameters.
We demonstrate broadband frequency comb generation in the mid-infrared from 2.3 to 3.5 μm in a Si3N4 microresonator with Q=850,000 fabricated using an optimized process for decreasing intrinsic losses and overcoming stress limitations.
Silicon photonic devices are tuned by selective photo removal of upper chalcogenide glass layers. Phase delays in cascaded interferometer filters and couplers of ring resonators are arbitrarily adjusted. Responses remain stable following trimming.
Sensitivity of the optomechanical resonator to the surface mass change is demonstrated to be 1.2 Hz per pg/mm2 by gradually removing SiO2 molecules from the resonator surface. A detection limit of 83 pg/mm2 is achieved.
We demonstrated the first monolithically integrated self-rolled-up SiNx tube based vertical photonic coupler on top of a planar ridge waveguide. The coupling efficiency between the elements is >10 times higher than similar non-integrated device.
We experimentally demonstrate the first ultrafast graphene modulator by exploiting Zeno coupling effects in a graphene-on-silicon-nitride ring resonator.
We fabricated a WDM transmitter consisting of Si photonic crystal MZ modulators, triangular-shaped coupled-microring multiplexers and optical switches. 25 Gbps/ch operation and hitless switching of channel wavelength were successfully obtained.
An efficient polarization beam splitter (PBS) based on a silica microcapillary is proposed and experimentally demonstrated. This PBS relies on the inherent-geometry-induced birefringence. A maximum extinction ratio of up to 25 dB is achieved.
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