公开(公告)号：JP2003115894A

公开(公告)日：2003-04-18

申请号：JP2002157227

申请日：2002-05-30

Applicant: IBM

Inventor： AMES STEPHEN JOHN ,  BALL ROY KEARNS ,  SCHOW CLINT LEE ,  WHITE CHRISTOPHER KEITH

IPC: H04B10/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/158 ,  H04B10/26 ,  H04B10/43 ,  H04L29/08 ,  H04B10/28

Abstract: PROBLEM TO BE SOLVED: To provide a low-cost, easily packaged and fully self-contained data rate detector and a method of data rate autodetection that allows selection of the data rate of an incoming data signal without an external control signal or complicated clock recovery system. SOLUTION: A data receiver, which can be an optical transmitter/receiver, a modem and a router hub can detect the transmission rate of incoming data. The data are converted to electrical waves suited to passive or active band pass filtering. A frequency at which the wave is filtered is determined from a plurality of known possible transmission rates and selected as a frequency having the most detectable difference in the power spectrums. By packaging the filter at a correspondent frequency, data having that (those) frequency(ies) are transmitted. Next, a signal detector receives a signal transmitted through the filter and a corresponding data rate can be determined. Further, a plurality of frequencies can be filtered by using the stages of filters and signal detectors corresponding to different frequencies or by filters and detectors capable of operation in a plurality of frequencies.

公开(公告)号：GB2494035A

公开(公告)日：2013-02-27

申请号：GB201214380

申请日：2011-05-24

Applicant: IBM

Inventor： RYLYAKOV ALEXANDER ,  SCHOW CLINT LEE ,  GREEN WILLIAM MICHAEL ,  VLASOV YURIL

IPC: G02F1/01 ,  G02F1/025 ,  H04B3/40

Abstract: A transmission line (304) includes a plurality of segments forming an electrical path (203) and a continuous optical waveguide (205) passing through the segments. Discrete inductors (102) are formed between and connect adjacent segments. The inductors (102) are formed in a plurality of metal layers of an integrated circuit so as to balance the capacitance of an optical modulator which includes the transmission line (304) formed on the optical waveguide (205), thereby achieving a predetermined characteristic impedance for the transmission line. A delay locked loop (305) is used to control varactors (302) so as to match the delays of the optical and electrical signals. Optical waveguide segments (210) may be used to match the delays.