Browse Prior Art Database

Optical time multiplexing device

IP.com Disclosure Number: IPCOM000015641D
Original Publication Date: 2002-Jan-13
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue

IBM

Abstract

*Main Idea In optical telecommunications, pulsed signals on which data can be modulated are used. Increasing bandwidth demand leads to higher and higher modulation frequencies (bit rates). It hence is desirable to generate a pulse train with higher frequency by multiplying the frequency of a pulse train with lower frequency. This document describes an optical waveguide device that increases the bit rate of an incoming pulse train by a factor of 2, 4, 8, 16, etc. Furthermore, the document describes a device layout including a modulator that enables a signal power recovery up to 3 dB (a factor of two) as compared to a system in which the device alone is applied. The device is built in optical waveguide technology and consists of a series of couplers and delay lines as shown in figure 1. The gray lines are the optical waveguides, the section where they come close together are the couplers and the delay lines are indicated by DL. Fig. 1: Pulse multiplexer design