Potential ultra wide slow-light bandwidth enhancement

Wide-bandwidth, tunable, multiple-pulse-width optical delays using slow light in cesium vapor.

We demonstrate an all-optical delay line in hot cesium vapor that tunably delays 275 ps input pulses up to 6.8 ns and 740 input ps pulses up to 59 ns (group index of approximately 200) with little pulse distortion. The delay is made tunable with a fast reconfiguration time (hundreds of ns) by optically pumping out of the atomic ground states.

Ultra - Wide Bandwidth ( UWB ) Signal Propagation for Outdoor Wireless

|Ultra-wide bandwidth (UWB) signal propagation experiment is performed in a rural terrain to characterize the outdoor UWB signal propagation channel. The bandwidth of the signal used in this experiment is in excess of one GHz. The test apparatus and measurement technique are described. From the measured pulse response the mean delay, delay spread, propagation loss and forestation loss are deter...

An Ultra Wide Bandwidth System for In-Home Wireless Networking

In this article we present an ultra-wide bandwidth (UWB) wireless network for in-home cordless networking and wireless distribution of cable TV channels. The article describes the network services, the media access control, channel measurements, and the physical link transmitter and receiver design. The physical link is based on an interference suppressing OFDM (IS-OFDM) in which the total numb...

Impulse radio pulse shaping for ultra-wide bandwidth (UWB) systems

In this paper, we investigate the design of pulse shaping FIR filters for impulse radio ultrawideband (UWB) communications systems. The goal of the shaping is to meet an arbitrary spectrum mask, e.g., the mask mandated by the FCC for UWB emissions. Compared with classical FIR filter designs, the current problem introduces three new challenges: (1) it is minimax with quadratic constraints, (2) a...

Micromachined piezoelectric ultrasonic transducer with ultra-wide frequency bandwidth