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A concurrent dual-band oscillator using a single ring resonator is proposed in this letter. This novel oscillator employs a stepped-impedance (SI) which exists two orthogonal resonant modes, to provide a dual-band operation. Specifically, the new planar oscillator is designed with two transistors operating at two different frequencies as negative resistance devices, which compensate for the resonator...
We numerically investigate the Kerr comb generation in wavelengths around 2 micrometers where two photon absorption is still present. It is shown that optical comb generation and mode locking is possible if free carriers are swept out with a reversed bias PIN junction.
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.
A novel variable optical attenuator (VOA) based on two coupled rings in silicon-on-insulator (SOI) waveguides has been proposed and experimentally demonstrated, from which an attenuation varying from 0 dB to 35 dB can be obtained.
A four-channel external-cavity laser using one shared ring resonator, which provides a frequency grid, and four slave ring resonator enables us to select the lasing frequencies of the four subchannels from the grid frequencies. A proof-of-concept experiment, performed by butt-coupling an InP semiconductor optical amplifier to a Si wire waveguide external mirror chip, demonstrated lasing of each of...
Microelectromechanical systems (MEMS) resonators on Si have the potential to replace discrete L-C components in series resonant converters. With acoustic coupling rather than inductive coupling, these MEMS resonators achieve better electromagnetic interference (EMI) performance, and reduce size, weight and volume of the power converter. In this paper, ring shaped piezoelectric microresonators are...
A silicon ring resonator is coated with receptor molecules for selective enrichment of TNT. Upon intercalation of TNT, changes in effective refractive index lead to a shift in resonance frequency which can accurately be determined.
In this paper, a monolithic fabrication process for implementing a sensor device consisting of a ring resonator and dielectric image-waveguide on Silicon-on-Insulator (SOI) is presented for sensing applications. The device is implemented on high resistive silicon with the resistivity greater than 1000 il-cm to minimize the dielectric loss. The set of ring resonator and dielectric waveguide are optimized...
This paper presents the design of two types of wideband bandpass filters with different bandwidths for millimeter-wave D-band applications. The proposed filters are implemented on a three-layer structure deposited on a 400-µm silicon (Si) bulk with benzocyclobutene (BCB) as the substrate. The characteristics of the basic structures for these two types of bandpass filters, a square ring resonator and...
A silicon slotted ring resonator with flattened dispersion in the cavity is proposed to produce uniform spectral lines in on-chip frequency comb generations. Standard deviation of the free spectral range is improved by 250 times as compared to a strip waveguide in the same size.
We present a hermetically encapsulated breathe-mode ring resonator with very high quality factor (~473,000) and frequency at 10.65 MHz and 13.29 MHz. The resonator's nonlinear behavior is experimentally characterized and theoretically analyzed for the first time. The maximum current handling is measured and verified using two different methods. We find that material nonlinearity (nonlinear Young's...
Miniaturization of communication devices has initiated towards the integration of passive and active radio frequency devices on the single chip in order to reduce the size and cost of the systems. Recent advancement in three-dimensional fabrication technologies in conventional CMOS process is leading to a system-on-chip integration in which RF devices are among the candidates to be integrated. Microwave...
We demonstrate ultra-compact spectral shaping via thermo-optically tunable multiple-channel microring resonators on a silicon chip, and combine it with frequency-time mapping to achieve photonic radio-frequency arbitrary waveform generation (RFAWG).
This papers presents the optically switchable microstrip ring resonators for RF/microwave multifunctional systems. Tunability is achieved by increasing the power of the laser applied to the highly resistive silicon wafer and changing the properties of silicon under optical illumination. Tunable ring resonators with and without the optical switches have been design and simulated. Simulation results...
A ring resonator with a FWHM of 0.095 nm (11.6 GHz) is experimentally measured to have a 1.4 dB power penalty for a 10 Gbps NRZ OOK signal, due to spectral distortions. Numerical simulations match these results.
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