公开(公告)号：JPH07140496A

公开(公告)日：1995-06-02

申请号：JP19896894

申请日：1994-08-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： RITSUKARUDO KARUBUAANI ,  EMIRIO BUETSUTSUOONI

IPC: G02F1/313 ,  G02F1/09 ,  G02F1/31 ,  H04B10/213 ,  H04J14/02

Abstract: PURPOSE: To provide a wavelength selection optical switch which is simply and easily assembled by utilizing an equipment on the market and provided with really high wavelength selectivity for which the action of the equipment does not depend on polarized light since respective constituting elements do not depend on the polarized light further. CONSTITUTION: This two-input and two-output optical switch is provided with two optical circulators C1 and C2 with an input port and an output port which are the input/output of the switch and an optical band-pass filter FP placed between the two circulators C1 and C2 and a means capable of switching the carrier waves of a supplied wavelength so as to be reflected or transmitted and leading the carrier waves of the wavelength which enter the input port of one of the circulators C1 and C2 to the output port of the same circulator or the output port of the other circulator.

公开(公告)号：JPH08237195A

公开(公告)日：1996-09-13

申请号：JP34601895

申请日：1995-12-11

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROBERUTO KADETSUDOU ,  RITSUKARUDO KARUBUAANI ,  JIYUZETSUPE FUERARISU ,  ROBERUTO RANO ,  EMIRIO BUETSUTSUOONI

IPC: H04B10/02 ,  H04B10/20 ,  H04B10/213 ,  H04J14/02 ,  H04L12/437

Abstract: PROBLEM TO BE SOLVED: To efficiently use a transmission capacity. SOLUTION: In a ring network communication structure for communication with optical transmission lines 3A and 3B, plural nodes 2A...2E are mutually connected by at least first and second optical transmission lines 3A and 3B like optical fibers. A first wavelength λ1 is used for communication in one direction on the first transmission line 3A out of this pair of optical transmission lines to perform transmission in a ring network based on a WDN structure, and a second wavelength λ2 is used on the other optical transmission line 3B to perform communication in the opposite direction. If one of these connections gets faulty, nodes 2B and 2C adjacent to each other which cannot be connected are reconfigured, and the first wavelength λ1 is used on the second transmission line 3B and the second wavelength λ2 is used on the first transmission line 3A to continue the communication through another route given from the ring network. This structure is suitably applied to an SDH optical fiber ring network.

公开(公告)号：JPH07221708A

公开(公告)日：1995-08-18

申请号：JP33423194

申请日：1994-12-16

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： PIERO GAMUBIINI ,  EMIRIO BUETSUTSUOONI

IPC: H04B10/00 ,  H04B10/02 ,  H04L7/00 ,  H04Q3/00 ,  H04L12/28

Abstract: PURPOSE: To compensate the delay caused by possible difference in optical routes in a node by utilizing dispersion dependence on wavelength in an optical fiber. CONSTITUTION: In an optical ATM node, a synchronized ATM cell is sent into the segment of an optical fiber (FD) having high time dispersion and a prescribed length. ATM cell transmission is performed after the cell is converted into such an optical carrier at a tunable wavelength converter (CL) that reaches the input sides of the switching elements (Em1,..., Emh) of a node (NC) at a prescribed moment as a result of the fact that the cell has a wavelength different from the original wavelength of the cell and passes through the optical fiber (FD).

公开(公告)号：JPH07154372A

公开(公告)日：1995-06-16

申请号：JP19896994

申请日：1994-08-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： RITSUKARUDO KARUBUAANI ,  EMIRIO BUETSUTSUOONI

IPC: H04J14/00 ,  G02F1/09 ,  G02F1/31 ,  H04B10/20 ,  H04B10/213 ,  H04J14/02 ,  H04Q3/52 ,  H04L12/42

Abstract: PURPOSE: To operate optical carrier extracting and reinserting equipment without relying upon polarization by making the equipment applicable to a wavelength division system by using a filter which can be adjusted finely for wavelength. CONSTITUTION: Various kinds of carriers existing at the branch 1e of a transmission line reach a fiber section after passing through the ports P1 and P3 of a circulator C1. A filter FP passes carriers having a wavelength and the carriers reach a receiver Rxi through a fiber 5. Carriers having the another wavelength are reflected by the filter FP and reach the output branch 1u of the transmission line through the ports P3 and P2 of the circulator C1. Similarly, carriers λwhich are transmitted from a transmitter and rely upon the input 3 of another circulator C2 pass through the filter FP in the reflecting direction and are inserted into a wavelength division multiplexing system at the output 1u of optical carrier extracting and reinserting equipment along a route (the ports P1' and P3' of the circulator C2, the fiber 5, and ports P3 and P2 of the circulator C1).