Berkehan Ciftcioglu

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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)
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)
We propose injection-locked clocking (ILC) to combat deteriorating clock skew and jitter, and reduce power consumption in high-performance microprocessors. In the new clocking scheme, injection-locked oscillators are used as local clock receivers. Compared to conventional clocking with buffered trees or grids, ILC can achieve better power efficiency, lower(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)
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)
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 using(More)
This paper studies integrated silicon photodiodes (PDs) implemented in standard CMOS technologies. A new PIN PD structure utilizing deep n-well is presented, and compared with conventional vertical and lateral PIN PDs at 850-nm wavelength and different bias conditions. Prototype PDs were fabricated in a 0.18m standard CMOS technology, and their DC, impulse(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)
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 onchip metal interconnects. These systems have therefore become increasingly communications-limited. The(More)