公开(公告)号：EP1368701B1

公开(公告)日：2004-08-11

申请号：EP02720094.8

申请日：2002-03-15

Applicant: THE UNIVERSITY OF SOUTHAMPTON

Inventor： RICHARDSON, David John ,  LEE, Ju Han ,  IBSEN, Morten ,  PETROPOULOS, Periklis ,  THE, Peh Choing

IPC: G02F1/35 ,  H04B10/18 ,  H04J14/02

CPC classification number: H04B10/2507 ,  G02F1/3515 ,  G02F2201/02 ,  G02F2201/307

公开(公告)号：EP1264433A1

公开(公告)日：2002-12-11

申请号：EP01910040.3

申请日：2001-03-09

Applicant: THE UNIVERSITY OF SOUTHAMPTON

Inventor： RICHARDSON, David John ,  PETROPOULOS, Periklis ,  IBSEN, Morten ,  TEH, Peh Chiong ,  LEE, Ju Han

IPC: H04J13/00 ,  H04B10/158 ,  G02F1/35

CPC classification number: H04J14/005 ,  G02B6/02085 ,  G02B6/02152 ,  G02F1/3519

Abstract: An optical transmission system comprising transmitter, link and receiver. At the receiver a decoder is connected to receive the encoded optical signal from the link and decode it according to a decoding signature carried by the decoder that is complementary to the encoding signature at the transmitter coder. The signal is thus decoded to produce a decoded optical signal having a broadened autocorrelation peak and an unwanted background pedestal component. After amplification (EDFA3) the decoded signal is supplied through a non-linear optical element in the form of a non-linear optical loop mirror (NOLM). The NOLM enhances the autocorrelation peak intensity relative to the pedestal and compresses its pulse width, to return the pulse width to the same or narrower than prior to coding at the transmitter. This approach provides a simple passive way of improving the reception quality of an optical signal that has been decoded after spread-spectrum encoded transmission such as optical code division multiple access (OCDMA). The receiver performs this function without the need for complicated optical gating circuitry.

公开(公告)号：EP1264433B1

公开(公告)日：2006-02-08

申请号：EP01910040.3

申请日：2001-03-09

Applicant: THE UNIVERSITY OF SOUTHAMPTON

Inventor： RICHARDSON, David John ,  PETROPOULOS, Periklis ,  IBSEN, Morten ,  TEH, Peh Chiong ,  LEE, Ju Han

IPC: H04J13/00 ,  H04B10/158 ,  G02F1/35

CPC classification number: H04J14/005 ,  G02B6/02085 ,  G02B6/02152 ,  G02F1/3519

Abstract: An optical transmission system comprising transmitter, link and receiver. At the receiver a decoder is connected to receive the encoded optical signal from the link and decode it according to a decoding signature carried by the decoder that is complementary to the encoding signature at the transmitter coder. The signal is thus decoded to produce a decoded optical signal having a broadened autocorrelation peak and an unwanted background pedestal component. After amplification (EDFA3) the decoded signal is supplied through a non-linear optical element in the form of a non-linear optical loop mirror (NOLM). The NOLM enhances the autocorrelation peak intensity relative to the pedestal and compresses its pulse width, to return the pulse width to the same or narrower than prior to coding at the transmitter. This approach provides a simple passive way of improving the reception quality of an optical signal that has been decoded after spread-spectrum encoded transmission such as optical code division multiple access (OCDMA). The receiver performs this function without the need for complicated optical gating circuitry.

公开(公告)号：EP1368701A2

公开(公告)日：2003-12-10

申请号：EP02720094.8

申请日：2002-03-15

Applicant: THE UNIVERSITY OF SOUTHAMPTON

Inventor： RICHARDSON, David John ,  LEE, Ju Han ,  IBSEN, Morten ,  PETROPOULOS, Periklis ,  THE, Peh Choing

IPC: G02F1/35 ,  H04B10/18 ,  H04J14/02

CPC classification number: H04B10/2507 ,  G02F1/3515 ,  G02F2201/02 ,  G02F2201/307

Abstract: Apparatus for providing timing jitter tolerant optical modulation of a first signal (1) by a second signal (2), the first signal having a first wavelength (3), the second signal comprising a plurality of second signal pulses (4) having a second pulse shape (5) and a second wavelength (6), and the apparatus comprising a first signal input port (8), a second signal input port (9), a coupler (10), a grating (11) and a non-linear optical device (12), the apparatus being configured to direct the second signal (2) at the second signal input port (9) to the non-linear optical device (12) via the coupler (10) and the grating (11), and to direct the first signal (1) at the first signal input port (8) to the non-linear optical device (12); the grating (11) being a superstructured fibre Bragg grating that converts the second signal pulses (4) into intermediary pulses (13) each having an intermediary pulse shape (14); the intermediary pulse shape (14) being such that it provides a switching window (19) within the non-linear optical device (12).