Browse Prior Art Database

Time Multiplexing System

IP.com Disclosure Number: IPCOM000073786D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Kagan, MR: AUTHOR

Abstract

This is a system for time-multiplexing picosecond pulses of large amplitude which may be emitted, for example, from a mode-locked giant-pulse laser. Each pulse is transmitted through a monolithic delay element which is fabricated to delay portions of a single collimated pulse for different time intervals. In this way a single pulse is converted into a sequence of pulses which are delayed with respect to each other by periods determined by the delay element.

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Time Multiplexing System

This is a system for time-multiplexing picosecond pulses of large amplitude which may be emitted, for example, from a mode-locked giant-pulse laser. Each pulse is transmitted through a monolithic delay element which is fabricated to delay portions of a single collimated pulse for different time intervals. In this way a single pulse is converted into a sequence of pulses which are delayed with respect to each other by periods determined by the delay element.

A source of a giant pulse 10, having a pulse width in the order of picoseconds, emits a pulse which is spatially broadened by diverging lens 12 and then collimated by converging lens 14. The collimated pulse is then intercepted by monolithic delay element 16. The delay element is stepped so that the upper portion of the collimated beam is delayed for a period depending on the optical path length of the element 16. In the example, the unit delay Delta t is defined by the lowest portion of the element 16; and the uppermost portion is set at 5 Delta
t. The pulses may be transmitted through electro-optical modulators 18 and analyzer 20 if it is desired to code the pulses in binary fashion. The pulses are then passed through lens plate 22 which serves to focus the pulses. The sequentially delayed pulses are then focused by converging lens 24 onto a collection area 26 which may be a photodetector. The light pulses received by the collector 26 are displaced in time relative to each other in a...