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公开(公告)号：CA1289746C
公开(公告)日：1991-10-01
申请号：CA520816
申请日：1986-10-17
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： COCITO GIUSEPPE , GREGO GIORGIO , MODONE EROS
IPC: G02B6/00 , C03B37/012 , C03B37/018 , G02B6/024 , C03B37/027 , C03B37/15
Abstract: A method is provided for fabrication of optical fibres with non-circular core cross section using the ICVD technique, by depositing layers of material which vary in thickness around the internal perimeter of each section of a reaction tube so as to form a preform which can be collapsed to a non-circular profile. The non-uniform thickness can be obtained by varying the profile or wall thickness of the reaction tube, or by selectively shielding the tube from a heat source, so as to vary the temperature at different points on the periphery of the tube during deposition.
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公开(公告)号：IT1205397B
公开(公告)日：1989-03-15
申请号：IT6817383
申请日：1983-11-10
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: The connector ensures the alignment between the two fibres ends (9, 10) thanks to the force exerted by a locally generated magnetic field (5, 6, 7, 8) on a ferromagnetic fluid placed between the side fibre surface and a small tube (1) with a diameter greater than fibre diameter.
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公开(公告)号：DE3466082D1
公开(公告)日：1987-10-15
申请号：DE3466082
申请日：1984-11-07
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: The connector ensures the alignment between the two fibres ends (9, 10) thanks to the force exerted by a locally generated magnetic field (5, 6, 7, 8) on a ferromagnetic fluid placed between the side fibre surface and a small tube (1) with a diameter greater than fibre diameter.
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公开(公告)号：IT1155285B
公开(公告)日：1987-01-28
申请号：IT6715082
申请日：1982-02-10
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: A body transparent to laser radiation, such as an optical fiber or a preform thereof, is transluminated by a monochromatic beam of a frequency in the THz range split off from a composite laser beam with two closely spaced frequencies produced by the Zeeman effect; the width of that beam in a plane transverse to the body axis is at least equal to the diameter of that body. Another monochromatic beam at the second laser frequency bypasses the transparent body and is recombined with the first beam downstream of the transluminated body to form a field of radiation which is photoelectrically sampled at closely spaced locations in the aforementioned transverse plane to provide a multiplicity of electrtical signals in the MHz range differing in phase from a reference wave of the same frequency photoelectrically obtained from the same monochromatic beams. The phase differences, determined by a comparator, are fed to a calculator computing the refractive-index profile therefrom.
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公开(公告)号：DE3365511D1
公开(公告)日：1986-10-02
申请号：DE3365511
申请日：1983-02-08
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: A body transparent to laser radiation, such as an optical fiber or a preform thereof, is transluminated by a monochromatic beam of a frequency in the THz range split off from a composite laser beam with two closely spaced frequencies produced by the Zeeman effect; the width of that beam in a plane transverse to the body axis is at least equal to the diameter of that body. Another monochromatic beam at the second laser frequency bypasses the transparent body and is recombined with the first beam downstream of the transluminated body to form a field of radiation which is photoelectrically sampled at closely spaced locations in the aforementioned transverse plane to provide a multiplicity of electrtical signals in the MHz range differing in phase from a reference wave of the same frequency photoelectrically obtained from the same monochromatic beams. The phase differences, determined by a comparator, are fed to a calculator computing the refractive-index profile therefrom.
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Patent Agency Ranking
公开(公告)号：AU550133B2
公开(公告)日：1986-03-06
申请号：AU8508882
申请日：1982-06-22
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
IPC: C03B37/025 , G01B7/12
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公开(公告)号：FR2545806A3
公开(公告)日：1984-11-16
申请号：FR8406674
申请日：1984-04-27
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: The drum consists of an envelope (1) of an airtight plastic material having a certain degree of resiliency. The envelope (1) defines an internal chamber (5) maintained at a pressure somewhat higher than room pressure, presents hollows (6) permitting engagement with a driving device and is equipped with a valve (7) for varying the pressure inside the chamber (5).
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公开(公告)号：IT8353304V0
公开(公告)日：1983-05-11
申请号：IT5330483
申请日：1983-05-11
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
Abstract: The drum consists of an envelope (1) of an airtight plastic material having a certain degree of resiliency. The envelope (1) defines an internal chamber (5) maintained at a pressure somewhat higher than room pressure, presents hollows (6) permitting engagement with a driving device and is equipped with a valve (7) for varying the pressure inside the chamber (5).
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公开(公告)号：NO822345L
公开(公告)日：1983-01-07
申请号：NO822345
申请日：1982-07-05
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： GREGO GIORGIO
IPC: C03B37/025 , G01B7/12 , G01B
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公开(公告)号：DE69600121T2
公开(公告)日：1998-05-07
申请号：DE69600121
申请日：1996-02-22
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： COCITO GIUSEPPE , GREGO GIORGIO
Abstract: To manufacture polarisation-maintaining optical fibres, a fibre (8) is directly and continuously irradiated with at least one beam (9) of UV radiation during drawing and before application of external coatings.
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