公开(公告)号：EP0716521A3

公开(公告)日：1998-06-10

申请号：EP95119360

申请日：1995-12-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CADEDDU ROBERTO ,  CALVANI RICCARDO ,  FERRARIS GIUSEPPE ,  LANO ROBERTO ,  VEZZONI EMILIO

IPC: H04B10/02 ,  H04B10/20 ,  H04B10/213 ,  H04J14/02

CPC classification number: H04J14/0283 ,  H04J14/0201 ,  H04J14/0212 ,  H04J14/0295

Abstract: In a ring network communication structure for communication on an optical carrier (3A, 3B), a plurality of nodes (2A, ..., 2E) are interconnected by means of connections comprising at least a first (3A) and a second (3B) optical carrier, such as an optical fibre. Transmission occurs on the ring according to a WDM scheme, by utilising a first wavelength (λ
1 ) for communication in one direction on the first carrier (3A) of said pair, while communication in the opposite direction occurs by employing a second wavelength (λ
2 ) on the other optical carrier (3B). In the presence of a failure on one of the connections, the nodes adjacent (2B, 2C) to the failed connection reconfigure themselves to ensure the continuation of communication on the alternative path provided by the ring, by utilising the first wavelength (λ
1 ) on the second carrier (3B) and the second wavelength (λ
2 ) on the first carrier (3A). Preferential application to SDH optical fibre ring networks.

公开(公告)号：ITTO990687D0

公开(公告)日：1999-08-03

申请号：ITTO990687

申请日：1999-08-03

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GAMBINI PIERO ,  ZUCCHELLI LIBERO ,  LANO ROBERTO

IPC: H04B10/00 ,  H04L7/027 ,  H04L7/033

公开(公告)号：CA2172204C

公开(公告)日：1999-02-02

申请号：CA2172204

申请日：1996-03-20

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BENDELLI GIAMPAOLO ,  LANO ROBERTO

IPC: G02B26/00 ,  G02B6/34 ,  H04J14/00 ,  H04J14/04 ,  H04J14/06 ,  H04J14/02 ,  G02B27/10

Abstract: Add-drop multiplexer comprising a pair of substantially identical first and second interference filters. The first filter extracts a carrier from a wavelength division multiplexed stream and the second filter inserts a carrier into the stream. The filters are arranged in parallel planes and mounted to opposite faces of a transparent plate, in such a way that the stream exits the multiplexer after being reflecting by both filters. The transparent plate is mounted on a support which is rotatable in either direction to vary the tuning wavelength of the filters.

公开(公告)号：IT1267645B1

公开(公告)日：1997-02-07

申请号：ITTO941008

申请日：1994-12-09

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CADEDDU ROBERTO ,  CALVANI RICCARDO ,  FERRARIS GIUSEPPE ,  LANO ROBERTO ,  VEZZONI EMILIO

IPC: H04B10/27 ,  H04B10/03 ,  H04B10/275 ,  H04J14/02

Abstract: In a ring network communication structure for communication on an optical carrier (3A, 3B), a plurality of nodes (2A, ..., 2E) are interconnected by means of connections comprising at least a first (3A) and a second (3B) optical carrier, such as an optical fibre. Transmission occurs on the ring according to a WDM scheme, by utilising a first wavelength ( lambda 1) for communication in one direction on the first carrier (3A) of said pair, while communication in the opposite direction occurs by employing a second wavelength ( lambda 2) on the other optical carrier (3B). In the presence of a failure on one of the connections, the nodes adjacent (2B, 2C) to the failed connection reconfigure themselves to ensure the continuation of communication on the alternative path provided by the ring, by utilising the first wavelength ( lambda 1) on the second carrier (3B) and the second wavelength ( lambda 2) on the first carrier (3A). Preferential application to SDH optical fibre ring networks.

公开(公告)号：ITTO950215D0

公开(公告)日：1995-03-22

申请号：ITTO950215

申请日：1995-03-22

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： LANO ROBERTO

IPC: G02F20060101

公开(公告)号：DE716521T1

公开(公告)日：1999-03-04

申请号：DE95119360

申请日：1995-12-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CADEDDU ROBERTO ,  CALVANI RICCARDO ,  FERRARIS GIUSEPPE ,  LANO ROBERTO ,  VEZZONI EMILIO

IPC: H04B10/27 ,  H04B10/03 ,  H04B10/275 ,  H04J14/02 ,  H04Q11/00 ,  H04B10/213

Abstract: In a ring network communication structure for communication on an optical carrier (3A, 3B), a plurality of nodes (2A, ..., 2E) are interconnected by means of connections comprising at least a first (3A) and a second (3B) optical carrier, such as an optical fibre. Transmission occurs on the ring according to a WDM scheme, by utilising a first wavelength ( lambda 1) for communication in one direction on the first carrier (3A) of said pair, while communication in the opposite direction occurs by employing a second wavelength ( lambda 2) on the other optical carrier (3B). In the presence of a failure on one of the connections, the nodes adjacent (2B, 2C) to the failed connection reconfigure themselves to ensure the continuation of communication on the alternative path provided by the ring, by utilising the first wavelength ( lambda 1) on the second carrier (3B) and the second wavelength ( lambda 2) on the first carrier (3A). Preferential application to SDH optical fibre ring networks.

公开(公告)号：CA2164778A1

公开(公告)日：1996-06-10

申请号：CA2164778

申请日：1995-12-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CADEDDU ROBERTO ,  CALVANI RICCARDO ,  FERRARIS GIUSEPPE ,  LANO ROBERTO ,  VEZZONI EMILIO

IPC: H04B10/27 ,  H04B10/03 ,  H04B10/275 ,  H04J14/02 ,  H04J1/02

Abstract: In a ring network communication structure for communication on an optical carrier (3A, 3B), a plurality of nodes (2A, ..., 2E) are interconnected by means of connections comprising at least a first (3A) and a second (3B) optical carrier, such as an optical fibre. Transmission occurs on the ring according to a WDM scheme, by utilising a first wavelength ( lambda 1) for communication in one direction on the first carrier (3A) of said pair, while communication in the opposite direction occurs by employing a second wavelength ( lambda 2) on the other optical carrier (3B). In the presence of a failure on one of the connections, the nodes adjacent (2B, 2C) to the failed connection reconfigure themselves to ensure the continuation of communication on the alternative path provided by the ring, by utilising the first wavelength ( lambda 1) on the second carrier (3B) and the second wavelength ( lambda 2) on the first carrier (3A). Preferential application to SDH optical fibre ring networks.

公开(公告)号：ITTO941008D0

公开(公告)日：1994-12-09

申请号：ITTO941008

申请日：1994-12-09

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CADEDDU ROBERTO ,  CALVANI RICCARDO ,  FERRARIS GIUSEPPE ,  LANO ROBERTO ,  VEZZONI EMILIO

IPC: H04B10/02 ,  H04B10/20 ,  H04B10/213 ,  H04J14/02

Abstract: In a ring network communication structure for communication on an optical carrier (3A, 3B), a plurality of nodes (2A, ..., 2E) are interconnected by means of connections comprising at least a first (3A) and a second (3B) optical carrier, such as an optical fibre. Transmission occurs on the ring according to a WDM scheme, by utilising a first wavelength ( lambda 1) for communication in one direction on the first carrier (3A) of said pair, while communication in the opposite direction occurs by employing a second wavelength ( lambda 2) on the other optical carrier (3B). In the presence of a failure on one of the connections, the nodes adjacent (2B, 2C) to the failed connection reconfigure themselves to ensure the continuation of communication on the alternative path provided by the ring, by utilising the first wavelength ( lambda 1) on the second carrier (3B) and the second wavelength ( lambda 2) on the first carrier (3A). Preferential application to SDH optical fibre ring networks.

公开(公告)号：ITTO941008A0

公开(公告)日：1994-12-09

申请号：ITTO941008

申请日：1994-12-09

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CADEDDU ROBERTO ,  CALVANI RICCARDO ,  FERRARIS GIUSEPPE ,  LANO ROBERTO ,  VEZZONI EMILIO

IPC: H04J14/02

Abstract: In a ring network communication structure for communication on an optical carrier (3A, 3B), a plurality of nodes (2A, ..., 2E) are interconnected by means of connections comprising at least a first (3A) and a second (3B) optical carrier, such as an optical fibre. Transmission occurs on the ring according to a WDM scheme, by utilising a first wavelength ( lambda 1) for communication in one direction on the first carrier (3A) of said pair, while communication in the opposite direction occurs by employing a second wavelength ( lambda 2) on the other optical carrier (3B). In the presence of a failure on one of the connections, the nodes adjacent (2B, 2C) to the failed connection reconfigure themselves to ensure the continuation of communication on the alternative path provided by the ring, by utilising the first wavelength ( lambda 1) on the second carrier (3B) and the second wavelength ( lambda 2) on the first carrier (3A). Preferential application to SDH optical fibre ring networks.

公开(公告)号：CA2164778C

公开(公告)日：1999-03-23

申请号：CA2164778

申请日：1995-12-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CADEDDU ROBERTO ,  CALVANI RICCARDO ,  FERRARIS GIUSEPPE ,  VEZZONI EMILIO ,  LANO ROBERTO

IPC: H04B10/27 ,  H04B10/03 ,  H04B10/275 ,  H04J14/02 ,  H04J1/02 ,  H04L12/42

Abstract: A ring network communication structure for communication comprising a nodes connected to each other in pairs and each connection comprising pairs of first and second optical carriers. Transmission occurs on the ring according to a WDM scheme, by utilizing a first wavelength for communication in one direction on the first carrier of the pair, and a second wavelength for communication in the opposite direction on the other optical carrier. In the presence of a failure on one of the connections, the nodes adjacent to the failed connection are reconfigured to provide continuation of communication on the alternative path provided by the ring, by utilizing the first wavelength for communication on the second carrier and the second wavelength for communication on the first carrier. The ring structure is suitable for application to SDH optical fibre ring networks.