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- Keyword
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- ADD-DROP FILTERS; PROPAGATION LOSS; MICRORING RESONATORS; FABRICATION (1)
- Micro-resonator; Si waveguide; transition loss (1)
- ON-INSULATOR TECHNOLOGY; WAVE-GUIDES; RESONATOR; NANOMEMBRANES; LITHOGRAPHY; ELECTRONICS; CIRCUITS; WIRE (1)
- OPTICAL FREQUENCY COMBS; GENERATION; MICRORESONATOR; RESONATOR; MICROCAVITY; MODE; CHIP (1)
- WAVE-FORM GENERATION; PHASE MODULATORS; SPECTROMETER; RESONATOR; LASERS; TIME (1)
Articles 1 - 5 of 5
Full-Text Articles in Nanoscience and Nanotechnology
A Taper To Reduce The Straight-To-Bend Transition Loss In Compact Silicon Waveguides, Hao Shen, Li Fan, Jian Wang, Justin Wirth, Minghao Qi
A Taper To Reduce The Straight-To-Bend Transition Loss In Compact Silicon Waveguides, Hao Shen, Li Fan, Jian Wang, Justin Wirth, Minghao Qi
Jian Wang
Strong confinement of light in silicon waveguides allows for sharp bends and, as a result, high-density integration. However, the mode transition loss between the straight and bent portions of a silicon waveguide begins to affect the device performance when the bending radius becomes small. In this letter, we show that a transition region with a step taper between the straight and bent portions of the waveguide can effectively reduce this transition loss. This is demonstrated by measuring the intrinsic round-trip losses of micro-racetrack resonators, where ultralow loss can be precisely characterized according to the quality (Q)-factor change. The results show …
Direct Fabrication Of Silicon Photonic Devices On A Flexible Platform And Its Application For Strain Sensing, Li Fan, Leo Varghese, Yi Xuan, Jian Wang, Ben Niu, Minghao Qi
Direct Fabrication Of Silicon Photonic Devices On A Flexible Platform And Its Application For Strain Sensing, Li Fan, Leo Varghese, Yi Xuan, Jian Wang, Ben Niu, Minghao Qi
Jian Wang
We demonstrate a process to fabricate silicon photonic devices directly on a plastic film which is both flexible and transparent. This process allows the integration of complex structures on plastic films without the need of transferring from another substrate. Waveguides, grating couplers, and microring resonators are fabricated and optically characterized. An optical strain sensor is shown as an application using 5 mu m-radius microring resonators on the flexible substrate. When strain is applied, resonance wavelength shifts of the microring resonators are observed. Contributions of different effects are analyzed and evaluated. Finally, we measure the influence of residual strain and confirm …
An All-Silicon Passive Optical Diode, Li Fan, Jian Wang, Leo Varghese, Hao Shen, Ben Niu, Yi Xuan, Andrew Weiner, Minghao Qi
An All-Silicon Passive Optical Diode, Li Fan, Jian Wang, Leo Varghese, Hao Shen, Ben Niu, Yi Xuan, Andrew Weiner, Minghao Qi
Jian Wang
A passive optical diode effect would be useful for on-chip optical information processing but has been difficult to achieve. Using a method based on optical nonlinearity, we demonstrate a forward-backward transmission ratio of up to 28 decibels within telecommunication wavelengths. Our device, which uses two silicon rings 5 micrometers in radius, is passive yet maintains optical nonreciprocity for a broad range of input power levels, and it performs equally well even if the backward input power is higher than the forward input. The silicon optical diode is ultracompact and is compatible with current complementary metal-oxide semiconductor processing.
Observation Of Correlation Between Route To Formation, Coherence, Noise, And Communication Performance Of Kerr Combs, Pei-Hsun Wang, Fahmida Ferdous, Houxun Miao, Jian Wang, Daniel Leaird, Kartik Srinivasan, Lei Chen, Vladimir Aksyuk, Andrew Weiner
Observation Of Correlation Between Route To Formation, Coherence, Noise, And Communication Performance Of Kerr Combs, Pei-Hsun Wang, Fahmida Ferdous, Houxun Miao, Jian Wang, Daniel Leaird, Kartik Srinivasan, Lei Chen, Vladimir Aksyuk, Andrew Weiner
Jian Wang
Microresonator optical frequency combs based on cascaded four-wave mixing are potentially attractive as a multi-wavelength source for on-chip optical communications. In this paper we compare time domain coherence, radio-frequency (RF) intensity noise, and individual line optical communications performance for combs generated from two different silicon nitride microresonators. The comb generated by one microresonator forms directly with lines spaced by a single free spectral range (FSR) and exhibits high coherence, low noise, and excellent 10 Gbit/s optical communications results. The comb generated by the second microresonator forms initially with multiple FSR line spacing, with additional lines later filling to reach single …
Spectral Line-By-Line Pulse Shaping Of On-Chip Microresonator Frequency Combs, Fahmida Ferdous, Houxun Miao, Daniel Leaird, Kartik Srinivasan, Jian Wang, Lei Chen, Leo Tom Varghese, Andrew Weiner
Spectral Line-By-Line Pulse Shaping Of On-Chip Microresonator Frequency Combs, Fahmida Ferdous, Houxun Miao, Daniel Leaird, Kartik Srinivasan, Jian Wang, Lei Chen, Leo Tom Varghese, Andrew Weiner
Jian Wang
Recently, on-chip comb generation methods based on nonlinear optical modulation in ultrahigh-quality-factor monolithic microresonators have been demonstrated, where two pump photons are transformed into sideband photons in a four-wave-mixing process mediated by Kerr nonlinearity. Here, we investigate line-by-line pulse shaping of such combs generated in silicon nitride ring resonators. We observe two distinct paths to comb formation that exhibit strikingly different time-domain behaviours. For combs formed as a cascade of sidebands spaced by a single free spectral range that spread from the pump, we are able to compress stably to nearly bandwidth-limited pulses. This indicates high coherence across the spectra …