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Patent Agency Ranking
公开(公告)号：JP2001356233A
公开(公告)日：2001-12-26
申请号：JP2001147224
申请日：2001-05-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOLOWICH STEVEN EUGENE , JONES SEAN L , RITGER ALBERT JOHN , THORNBURG K SCOTT JR
IPC: C03B37/012 , G02B6/02 , G02B6/16
Abstract: PROBLEM TO BE SOLVED: To provide a device and a method to improve the band width of a multimode optical fiber so as to obtain a multimode optical fiber having improved band width and differential mode delay characteristics. SOLUTION: The embodiment of the invention includes an optical fiber preform (30) and a multimode optical fiber drawn from the preform and showing improved characteristics of the excess initiation band width without decreasing the conventional laser initiation band width characteristics. The optical fiber preform has a core region (34) having refractive index with specified differential mode delay which includes a first part belonging to the lower mode operating similar to the conventional one, and a second part belonging to the upper mode different from conventional operation so as to improve the excess initiation band width in a certain operating window without giving adverse influences on the laser initiation band width characteristics in the same and other operating windows. The structure of the preform optimized for the operation at 850 nm is constituted in such a manner that the differential mode delay specific to the preform a 1300 nm increases at the beginning similar to the conventional one and becomes horizontal with a value of nearly 0 in the upper modes and that the differential mode delay specific to the preform at 850 nm keeps horizontal with a value of nearly 0 similar to the conventional one and decreases in the upper modes.
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公开(公告)号：JP2001066475A
公开(公告)日：2001-03-16
申请号：JP2000218405
申请日：2000-07-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KALISH DAVID , NEVEUX PAUL EMILIEN JR , RITGER ALBERT JOHN , TAYLOR CARL RAYMOND , TURNIPSEED JOHN MICHAEL
Abstract: PROBLEM TO BE SOLVED: To obtain a novel optical energy transmission medium improved in mode coupling. SOLUTION: The optical energy transmission medium 10, such as an optical fiber, contains the foam 26 formed in this medium 10 in such a manner that the microbending of the medium 10 is induced, the advantageous mode coupling is thereby accelerated and consequently dispersion is lessened and the band-width potential is improved. The foam 26 is formed in >=1 layer of buffer region layer 22 and/or at the boundary between a coating region 16 and the buffer region 22. The process for producing the optical energy transmission medium consists controllably in forming >=1 layer of the buffer region layer around a coated optical fiber in such a form that a desired amount of the foam 26 is formed and held in >=1 layer of the buffer region layer 22 and/or the boundary between the coating region 16 and the buffer region 22. The foam 26 generates the prescribed perturbation to enhance the mode coupling to the extent that the band-width of the optical fiber is improved. The size and amount of the foam 26 are controlled by the moisture content in the coating layer.
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公开(公告)号：JP2002006165A
公开(公告)日：2002-01-09
申请号：JP2000171035
申请日：2000-06-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOLOWICH STEVEN EUGENE , REED WILLIAM ALFRED , RITGER ALBERT JOHN
Abstract: PROBLEM TO BE SOLVED: To provide a multi-mode fiber having an improved refractive index profile in low-mode by improving the behavior of high-mode propagation in a optical fiber and compensating for the existence of a center dip. SOLUTION: The optical fiber of this invention has a core and a cladding layer surrounding the core. The interface between the cladding layer and the core forms a boundary region and the core has a modified refractive index profile which is characterized by an alpha-profile corrected by at least one among the methods of (a) combining a step formed in the refractive index and linear correction adjacent the boundary region (b) combining of refractive index ripple and linear correction adjacent the boundary region (c) being to have refractive index ridge adjacent the center of the fiber.
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公开(公告)号：JP2001066474A
公开(公告)日：2001-03-16
申请号：JP2000218404
申请日：2000-07-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KALISH DAVID , NEVEUX PAUL EMILIEN JR , RITGER ALBERT JOHN , TAYLOR CARL RAYMOND , TURNIPSEED JOHN MICHAEL
Abstract: PROBLEM TO BE SOLVED: To obtain a novel optical energy transmission medium improved in mode coupling. SOLUTION: The optical energy transmission medium 10, such as an optical fiber, contains the plural particles formed in >=1 layer of coating layer enclosing a clad region and/or >=1 layer of buffer region layer 16 enclosing the coating layer. As a result, advantageous mode coupling is accelerated and consequently, the band-width potential lowered in dispersion is improved. This process for producing the optical energy transmission medium 10 consists in forming >=1 layer of the coating region layer and/or >=1 layer of the buffer region layer containing the particles in such a manner that the particles like those of fumed silica are maintained in the optical energy transmission medium and that the perturbation controlled along the optical fiber to enhance the mode coupling up to the extent of improving the band weight of the optical fiber is formed.
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5.发明专利
公开(公告)号：CA2310342A1
公开(公告)日：2000-12-07
申请号：CA2310342
申请日：2000-05-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOLOWICH STEVEN EUGENE , REED WILLIAM ALFRED , RITGER ALBERT JOHN
Abstract: A multi-mode optical fiber having an improved refractive index profile is disclosed. The refractive index profile is modified from a conventional by at least one of (i) a step formed in the index profile at the boundary of the core and cladding regions, in combination with a linear correction; (ii) a ripple near the core-cladding boundary, in combination with a linear correction, with or without an index step; and (iii) an annular ridge formed in the index profile of an .alpha.-profile with a center dip defect. The invention further relates to a communications system comprising the inventive fiber.
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