公开(公告)号：GB2366678B

公开(公告)日：2004-04-21

申请号：GB0022133

申请日：2000-09-09

Applicant: IBM

Inventor： FERGUSSON RICHARD JOHN ,  CRUMMEY TOM

IPC: H04B10/69 ,  H04L25/06 ,  H04L25/26 ,  H04B10/158 ,  H04L27/22

公开(公告)号：GB2366678A

公开(公告)日：2002-03-13

申请号：GB0022133

申请日：2000-09-09

Applicant: IBM

Inventor： FERGUSSON RICHARD JOHN ,  CRUMMEY TOM

IPC: H04B10/69 ,  H04L25/06 ,  H04L25/26 ,  H04B10/158 ,  H04L27/22

Abstract: An optical amplitude demodulator for demodulating signals received from a fibre optic link. The demodulator comprises a plurality of optical sensors for detecting optical output from the fibre optic link, whereby each of the optical sensors has a different detection threshold. Generally, the plurality of optical sensors produce a plurality of digital outputs corresponding to the optical output level detected. A priority encoder encodes the digital outputs into a multi-bit digital signal. Additionally, each of the plurality of optical sensors has an associated optical filter, whereby each of the filters has a different level of opaqueness. Each filter filters received optical output prior to detection by the associated optical sensor. For use with multi-level optical signals.