S. Yegnanarayanan

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—Recent developments in silicon based optoelectronics relevant to fiber optical communication are reviewed. Silicon-on-insulator photonic integrated circuits represent a powerful platform that is truly compatible with standard CMOS processing. Progress in epitaxial growth of silicon alloys has created the potential for silicon based devices with tailored(More)
—We discuss the introduction/implementation of optical IP routers, then we introduce a novel scheduling algorithm incorporating void filling and aimed at optical routing of asyn-chronous, variable packet length packets. We describe its structure and discuss the complexity issues. Albeit introduced with the purpose of cancelling the expensive optical(More)
We present a general theory of oscillator phase-noise for perturbations resulting from both white and flicker noise. Although fundamentally different, both noise sources share in common an underlying principle of analyzing noise in the basis of the oscillator. These similarities allow for an integrated description of noise using a common set of equations.(More)
We design and fabricate a compact third-order coupledresonator filter on the silicon-on-insulator platform with focused application for on-chip optical interconnects. The filter shows a large flat bandwidth (3dB 3.3nm), large FSR (approximately 18nm), more than 18dB out-of-band rejection at the drop port and more than 12 dB extinction at the through port,(More)
The spectral purity of every oscillator system is limited by phase noise. In this work, we extend the techniques previously used to analyze phase noise in lasers to develop an intuitive, yet powerful description of phase noise in an electromagnetic oscillator for the case when the oscillating field is sinusoidal and perturbed by white noise. The developed(More)
— We demonstrate the first phased-array wavelength multiplexer fabricated in the silicon-on-insulator (SOI) wave-guide technology. The four-channel wavelength division multi-plexer (WDM) has a channel spacing of 1.9 nm centered at 1550-nm wavelength and a 3-dB channel bandwidth of 0.72 nm. The crosstalk to neighboring channels is less than 022 dB and the(More)
—We demonstrate a new technique for implementation of fast wavelength-hopping incoherent optical code-division multiple access (CDMA). The output pulse from a mode locked laser is spectrally broadened through supercontinuum generation. This pulse is then encoded into fast wavelength-hopped time-spread waveforms through a wavelength-selective time-delay(More)
One of the major problems on the design of all-optical packet switching routers is to reduce the number of components and the number of components a signal has to traverse without affecting the teletraffic performance of a network. The number of components in a router is imposed by the degree of blocking probability desired. Blocking occurs when two or more(More)
A novel wavelength-selective photonic time-delay filter is proposed and demonstrated. The device consists of an optical phased-array waveguide grating in a recirculating feedback configuration. It can function as a true-time-delay generator for squint-free beam steering in optically controlled phased-array antennas and as an encoding-decoding filter for(More)