公开(公告)号：US5113459A

公开(公告)日：1992-05-12

申请号：US647141

申请日：1991-01-29

申请人： Giorgio Grasso ,  Mario Tamburello

发明人： Giorgio Grasso ,  Mario Tamburello

IPC分类号： H04J14/00 ,  H04B10/00 ,  H04J14/02

CPC分类号： H04B10/291 ,  H04B10/0777 ,  H04J14/0226 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/028 ,  H04B2210/078

摘要： An optical fiber transmission line which includes units for injecting into, and units for extracting, optical service signals from the line's optical fiber. The units include optical service signal emitters and receivers for receiving from the optical line and/or injecting into the optical line service signals in the form of optical signals having a wavelength which is substantially different from the wavelength of the telecommunication signals also transmitted over the optical line, each of the units is associated with an optical coupler which is inserted in the line and which is suitable for coupling it with the line fiber and/or for extracting the optical service signals from the line fiber.

公开(公告)号：US5054876A

公开(公告)日：1991-10-08

申请号：US555941

申请日：1990-07-20

申请人： Giorgio Grasso ,  Aldo Righetti ,  Flavio Fontana

发明人： Giorgio Grasso ,  Aldo Righetti ,  Flavio Fontana

IPC分类号： G02B6/44 ,  G02B6/00 ,  G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/094 ,  H01S3/10 ,  H04B3/46 ,  H04B10/00 ,  H04B17/02

CPC分类号： H04B10/2931 ,  H04B10/032 ,  H04B10/0775 ,  H04B10/0777 ,  H04B10/291 ,  H04B10/2912 ,  H01S3/06754 ,  H01S3/09408 ,  H04B2210/071 ,  H04B2210/074 ,  H04B2210/075

摘要： An optical fiber telecommunication line composed of a number of series connected optical cables arranged end-to-end includes an active core optical fiber amplifier for the transmitted signals between each adjacent pair of optical cables. Two pumping optical radiation sources are connected to each active core optical fiber within each of the amplifiers, one source for each end of a single active core optical fiber. One of these two sources is placed into service and the second one is kept in reserve to be placed into service if the first one fails. A microprocessing circuit causes the sources to send distinctive recognizable alarm signals indicative of the state of an associated amplifier to terminal stations at the ends of the line and to receive therefrom control signals to control and exchange the functions between the two sources as necessary.

公开(公告)号：US4938561A

公开(公告)日：1990-07-03

申请号：US291636

申请日：1988-12-29

申请人： Giorgio Grasso ,  Eleanor J. Tarbox ,  Paul L. Scrivener

发明人： Giorgio Grasso ,  Eleanor J. Tarbox ,  Paul L. Scrivener

IPC分类号： G02B6/02 ,  G02B6/34 ,  G02F1/313 ,  G02F1/35 ,  H01S3/067 ,  H01S3/094 ,  H04B10/12 ,  H04B10/13 ,  H04B10/135 ,  H04B10/14

CPC分类号： H01S3/094003 ,  G02F1/3131 ,  H01S3/06708 ,  H01S3/06729 ,  H01S3/06737 ,  H01S3/094011

摘要： An optical fibre structure usable in amplifying optical signals, comprising a length of optical fibre (1) which includes two uniformally spaced monomode optical cores (2,4) located within a common cladding (6) so as to provide two optical guidance paths, the optical characteristics of at least the cores being different such as to give the two guidance paths different propagation constants the values of which coincide for a predetermined coupling wavelength, one of the cores including a fluorescent material capable of producing stimulated emission. There is also disclosed a method of amplifying an optical signal using such an optical fibre structure, comprising arranging for the wavelength (.lambda..sub.s) of the optical signal, the fluorescent wavelength of said material in said one core, and said predetermined coupling wavelength all to be substantially the same, launching optical pump energy having a different wavelength (.lambda..sub.p) into said one core to pump the fluorescent material, launching the optical signal into the other core so that the optical signal transfers repeatedly between the two cores due to optical coupling and, when in said one core, gives rise to stimulated emission substantially at its own wavelength from the fluorescent material thereby becoming amplified, and extracting the amplified optical signal from the fibre structure when it is in said other core. A device (FIG. 4) using this method is also disclosed.