Fuwan Gan

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The goal of the research program that we describe is to break the emerging performance wall in microprocessor development arising from limited band-width and density of on-chip interconnects and chip-to-chip (processor-to-memory) electrical interfaces. Complementary metal-oxide semiconductor compatible photonic devices provide an infrastructure for(More)
Citation Holzwarth, C. W. et al. " High speed analog-to-digital conversion with silicon photonics. " Silicon Photonics IV. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how(More)
Photonic Analog-to-Digital Conversion (ADC) has a long history. The premise is that the superior noise performance of femtosecond lasers working at optical frequencies enables us to overcome the bottleneck set by jitter and bandwidth of electronic systems and components. We discuss and demonstrate strategies and devices that enable the implementation of(More)
Efficient thermal tuning of 36pm/K and 60µW/GHz is shown for high-index-contrast silicon nitride second-order filters. Their compact size, large free-spectral range, low tuning power, and silicon compatibility make these resonators attractive for photonic integration. Microring resonators can be used as tunable filters, wavelength switches, add-drop(More)
We demonstrate the first tunable, high-order channel add-drop filters based on silicon microring resonators. They meet rigorous, telecom-grade spectral requirements for microphotonic R-OADMs (reconfigura­ ble optical add-drop multiplexers). The design addresses 100GHz-spaced, 40GHz-wide channels over 16-32nm.
We demonstrate the first fully hitless (no out-of-band bit-loss/signal distortion) wavelength switching of microphotonic add-drop filters using silicon microring resonators, based on a new general approach for complete disabling of resonant-system amplitude and phase responses. For the first time, a general approach is proposed and experimentally(More)
A broadband, Mach-Zehnder-interferometer based silicon optical modulator is demonstrated, with an electrical bandwidth of 26 GHz and V(pi)L of 4 V.cm. The design of this modulator does not require epitaxial overgrowth and is therefore simpler to fabricate than previous devices with similar performance.
A key device in future high speed short reach interconnect technology will be the optical modulator. These devices, in silicon, have experienced dramatic improvements over the last 6 years and the modulation bandwidth has increased from a few tens of MHz to over 30 GHz. However, the demands of optical interconnects are significant. Here we describe an(More)
Advances in microring-resonator-based photonic structures and novel architectures are described that demonstrate the first low-loss telecom-grade filters, wide tuning, polarization transparency, and fully transparent (dispersion-free) wavelength switching using high-index-contrast (SiN-and Si-core), strong-confinement waveguides. A large number of(More)