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We present a high-speed and highly scalable silicon optical modulator based on the free carrier plasma dispersion effect. The fast refractive index modulation of the device is due to electric-field-induced carrier depletion in a Silicon-on-Insulator waveguide containing a reverse biased pn junction. To achieve high-speed performance, a travelling-wave(More)
We propose a new GHz clock distribution scheme, injection-locked clocking (ILC). This new scheme uses injection-locked oscillators as the local clock regenerators. It can achieve better power efficiency and jitter performance than conventional buffered trees with the additional benefit of built-in deskewing. A test chip is implemented in a standard 0.18mum(More)
Injection-locked clocking (ILC) has been proposed previously to improve the skew and jitter performance while reducing the power consumption in multi-gigahertz clock distribution networks. This paper presents a new design of the injection-locked oscillator (ILO) suitable for ILC applications. It uses a transformer to generate differential signals and then(More)
Continued device scaling enables microprocessors and other systems-on-chip (SoCs) to increase their performance, functionality, and hence, complexity. Simultaneously, relentless scaling, if uncompensated, degrades the performance and signal integrity of on-chip metal interconnects. These systems have therefore become increasingly communications-limited. The(More)
[11] A. Stroele, " BIST patter generators using addition and subtraction operations , " J. A concurrent built-in self-test architecture based on a self-testing RAM, " IEEE Trans. An on-chip march pattern generator for testing embedded memory cores, " IEEE Trans. Diagnostic data compression techniques for embedded memories with built-in self-test, " J.(More)
This paper presents a new photonic integrated circuit, namely optical pulse-train generator, which is developed based on the transfer matrix analysis of microrings and utilizes a time-interleaved architecture. This circuit can generate multiple optical pulses sequentially from a single trigger pulse, with the timing and amplitude of each pulse determined by(More)
This paper presents the first chip-scale demonstration of an intra-chip free-space optical interconnect (FSOI) we recently proposed. This interconnect system provides point-to-point free-space optical links between any two communication nodes, and hence constructs an all-to-all intra-chip communication fabric, which can be extended for inter-chip(More)
—This letter presents a new germanium metal–semicon-ductor–metal photodetector (PD), in which an amorphous silicon (a-Si) layer is added on top of the undoped germanium substrate. width achieved a small-signal 3-dB bandwidth over 10 GHz. In an ultrafast electrooptic sampling measurement, its impulse response exhibited 15-ps pulsewidth and 30-ps rise time,(More)
—This letter presents a new optical interconnect system for intrachip communications based on free-space optics. It provides all-to-all direct communications using dedicated lasers and photodetectors, hence avoiding packet switching while offering ultra-low latency and scalable bandwidth. A technology demonstration prototype is built on a circuit board(More)