65 research outputs found
Quantitative analysis of TM lateral leakage in foundry fabricated silicon Rib waveguides
We show that thin, shallow ridge, silicon-on-insulator waveguides exhibiting a lateral leakage behavior can be designed and fabricated using a standard silicon photonic foundry platform. We analyze the propagation loss through the observation of the transmitted TM polarized guided mode and TE polarized radiation and experimentally demonstrate that propagation losses as low as 0.087 dB/mm can be achieved. This demonstration will open a new frontier for practical devices exploiting a lateral leakage behavior with potential applications in the fields of biosensing and quantum optics among others
Photonic RF and microwave reconfigurable filters and true time delays based on an integrated optical Kerr frequency comb source
We demonstrate advanced transversal radio frequency (RF) and microwave
functions based on a Kerr optical comb source generated by an integrated
micro-ring resonator. We achieve extremely high performance for an optical true
time delay aimed at tunable phased array antenna applications, as well as
reconfigurable microwave photonic filters. Our results agree well with theory.
We show that our true time delay would yield a phased array antenna with
features that include high angular resolution and a wide range of beam steering
angles, while the microwave photonic filters feature high Q factors, wideband
tunability, and highly reconfigurable filtering shapes. These results show that
our approach is a competitive solution to implementing reconfigurable, high
performance and potentially low cost RF and microwaveComment: 15 pages, 11 Figures, 60 Reference
Cascaded multicavity resonantly enhanced Mach-Zehnder modulator
Abstract—A resonantly enhanced modulator structure with cascaded multiple resonant cavities is proposed and analyzed. The microwave effective index of the electrode can be much higher than the optical index. Therefore, the electrode structure can be optimized for high modulation efficiency and high resonant enhancement. I
Spatio-temporal isolator in lithium niobate on insulator
In this contribution, we simulate, design, and experimentally demonstrate an
integrated optical isolator based on spatiotemporal modulation in the thin-film
lithium niobate on insulator waveguide platform. We used two cascaded
travelling wave phase modulators for spatiotemporal modulation and a ring
resonator as a wavelength filter to suppress the sidebands of the reverse
propagating light. This enabled us to achieve an isolation of 27 dB. The
demonstrated suppression of the reverse propagating light makes such isolators
suitable for the integration with III-V laser diodes and Erbium doped gain
sections in the thin-film lithium niobate on insulator waveguide platform.Comment: 9 pages, 3 figure
Microwave and RF Applications for Micro-resonator based Frequency Combs
Photonic integrated circuits that exploit nonlinear optics in order to
generate and process signals all-optically have achieved performance far
superior to that possible electronically - particularly with respect to speed.
We review the recent achievements based in new CMOS-compatible platforms that
are better suited than SOI for nonlinear optics, focusing on radio frequency
(RF) and microwave based applications that exploit micro-resonator based
frequency combs. We highlight their potential as well as the challenges to
achieving practical solutions for many key applications. These material systems
have opened up many new capabilities such as on-chip optical frequency comb
generation and ultrafast optical pulse generation and measurement. We review
recent work on a photonic RF Hilbert transformer for broadband microwave
in-phase and quadrature-phase generation based on an integrated frequency
optical comb. The comb is generated using a nonlinear microring resonator based
on a CMOS compatible, high-index contrast, doped-silica glass platform. The
high quality and large frequency spacing of the comb enables filters with up to
20 taps, allowing us to demonstrate a quadrature filter with more than a
5-octave (3 dB) bandwidth and an almost uniform phase response.Comment: 10 pages, 6 figures, 68 references. arXiv admin note: substantial
text overlap with arXiv:1512.0174
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