Suresh Rangarajan

Learn More
Advanced transceivers generally require a multi-lane approach, which necessitates the integration of multiple subcomponents. The use of mature, generally available, and low-cost single element components such as electro-absorption modulated lasers, silica planar lightwave circuits, and direct-modulated distributed feedback lasers, integrated in a hybrid(More)
BACKGROUND We surveyed HIV patients with late-stage disease in southern Vietnam to determine if barriers to access and service quality resulted in late HIV testing and delays from initial diagnosis to entry into HIV care. METHODOLOGY 196 adult patients at public HIV clinics with CD4 counts less than 250 cells/mm3 completed a standardized questionnaire. We(More)
We present a new all-optical technique for resolving contention between asynchronous variable length packets. The approach utilizes a novel all-optical asynchronous latching switch based on cross-coupled injection-locked wavelength converters. We experimentally demonstrate that the scheme resolves contention between variable-length, asynchronous 40 Gb/s(More)
We experimentally demonstrate the use of optical payload envelope detection in a 40 Gbit/s asynchronous optical packet switch to synchronize the optical data and electrical control planes. Measurements show 100% envelope recovery over an 8.5 dB packet power dynamic range.
We describe an optical time-division-multiplexed (OTDM)/WDM network architecture that integrates high-speed optical time-division multiplexing at speeds of 40 Gbit/s and higher with lower-bit-rate WDM channels. An ultrafast wavelength converter is used as a regenerative multifunction building block for OTDM multiplexing, WDM-to-OTDM and OTDM-to-WDM(More)
A scalable loop-based packet compression scheme capable of handling variable length Internet protocol packets, from 40 to 1500 B, is proposed and demonstrated. The technique uses per packet variable compression ratio to achieve fixed compressed output packet size independent of input packet size. This technique allows variable length packets to be stored in(More)
Analog performance of an all-optical ultrafast wavelength converter is measured and reported for the first time. The wavelength-conversion process is based on nonlinear cross-phase modulation in an optical fiber combined with an optical filter to convert phase modulation to amplitude modulation. The spurious-free dynamic range (SFDR) of the converter is(More)
We experimentally assess the performance of a two-stage wavelength conversion label swapping sub-system operating at OC-48 line-rates and variable length packets with layer-3 traffic control. Wavelength switching times < 6 ns are observed giving insignificant throughput penalties for dynamic wavelength switching.