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We presented the design and fabrication of fiber-mode-matched three-dimension (3D) tapered couplers for efficient coupling light from fibers to photonic integrated circuits (PICs). The 3D adiabatic taper was made by SU8 and the structure was designed by beam propagation method (BPM). Measuring waveguide transmission with this 3D taper, we observed that the coupling efficiency was improved by 12 dB...
We demonstrate the design and performance of a silicon-on-insulator ring-resonator reflector with a low-loss, low-crosstalk waveguide crossing. The device is simulated using the transfer-matrix method and a 2D finite-difference mode solver. It functions as a reflective-type notch filter and can be used for optical communications or thermal, biochemical, or other sensors. An extinction ratio of over...
The paper presents a novel energy efficient routing scheme for photonic network on chip (PNoC) based on the microresonator which takes the insertion loss and the path-setup latency into consideration in order to design a high performance per watt multi-processors. The path-setup latency is a major contributor to the whole system's latency that has something to do with queuing. And insertion loss which...
A traveling-wave resonator structure with interferometric-coupling scheme is shown to have the capability of supporting both over-coupled and critically-coupled modes, simultaneously. This device is demonstrated in SOI with an integrated microheater to tune its coupling. The application of this device for nonlinear optics is discussed.
We introduce and discuss the principle of plane-wave transfer-matrix method and its application to photonic crystal integrated optical devices. After an extensive expansion and development of its power in the past 5 years, the method has been able to handle a great variety of optical problems in photonic crystal structures and devices. These include the solution of band diagrams of photonic crystals...
Ultra-high-quality (Q>4times106) microdisk resonators are demonstrated in a Si3N4 platform at 655 nm with straight and curved in-plane coupling waveguides. Selective coupling to specific radial orders and polarizations is demonstrated by phase-matching. TM modes show higher sensitivity to environmental modifications for sensing.
An optical switch based on the Mach-Zehnder interferometer (MZI) with a micro-ring resonator as the two-beam interferometer is proposed. By configuring appropriate coupling ratios, the improved MZI can always obtain a low crosstalk, even with seriously unbalanced interferencing beams.
A low-loss polarization-independent and wavelength-insensitive mode converter is demonstrated for coupling between standard single-mode fiber (SMF) and 1.5-??m-thick silicon waveguides. This mode converter consists of a double-stage taper fabricated using planar processing. Optical testing results show facet loss of approximately -1.5 dB/facet, for TE and TM polarizations across a wide wavelength...
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