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    1.
    发明专利
    未知

    公开(公告)号：DE60000025D1

    公开(公告)日：2001-12-06

    申请号：DE60000025

    申请日：2000-08-21

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BLYLER JR ,  GRIMES GARY J ,  SHERMAN CHARLES J

    IPC: G02B6/00 ,  B29C47/00 ,  B29D11/00 ,  G02B6/028 ,  G02B6/18

    Abstract: Fabricating graded index plastic optical fiber by diffusing a high molecular weight dopant within a step index plastic optical fiber after the step index plastic optical fiber has been drawn from a preform using a conventional draw tower in a first embodiment. Also, the step index plastic optical fiber may be fabricated by extruding one material circumferentially around another material, e.g., by use of a concentric nozzle. The dopant is diffused after the drawing or extruding of the step index plastic optical fiber by heating the plastic optical fiber to a temperature that causes a high rate of diffusion state while measuring the transmission bandwidth of the plastic optical fiber. When the predetermined specified transmission bandwidth is measured, the plastic optical fiber is immediately returned to an ambient temperature. In addition, the plastic optical fiber may be gradually heated to an equilibrium temperature that is just below the temperature required to produce the high rate of diffusion state. Once the equilibrium temperature has been achieved, additional heating is carried out to raise the temperature to that required to produce the high rate of diffusion and the transmission bandwidth is tested. In a second embodiment of the invention, the preform is initially heated for an amount of time that will allow the diffusion process to be partially completed. After the plastic optical fiber has been drawn, the remaining diffusion is accomplished by testing for the specified transmission bandwidth. Similarly, a partially diffused plastic optical fiber may be extruded.

    6.
    发明专利
    未知

    公开(公告)号：DE60000025T2

    公开(公告)日：2002-07-11

    申请号：DE60000025

    申请日：2000-08-21

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BLYLER JR ,  GRIMES GARY J ,  SHERMAN CHARLES J

    IPC: G02B6/00 ,  B29C47/00 ,  B29D11/00 ,  G02B6/028 ,  G02B6/18

    Abstract: Fabricating graded index plastic optical fiber by diffusing a high molecular weight dopant within a step index plastic optical fiber after the step index plastic optical fiber has been drawn from a preform using a conventional draw tower in a first embodiment. Also, the step index plastic optical fiber may be fabricated by extruding one material circumferentially around another material, e.g., by use of a concentric nozzle. The dopant is diffused after the drawing or extruding of the step index plastic optical fiber by heating the plastic optical fiber to a temperature that causes a high rate of diffusion state while measuring the transmission bandwidth of the plastic optical fiber. When the predetermined specified transmission bandwidth is measured, the plastic optical fiber is immediately returned to an ambient temperature. In addition, the plastic optical fiber may be gradually heated to an equilibrium temperature that is just below the temperature required to produce the high rate of diffusion state. Once the equilibrium temperature has been achieved, additional heating is carried out to raise the temperature to that required to produce the high rate of diffusion and the transmission bandwidth is tested. In a second embodiment of the invention, the preform is initially heated for an amount of time that will allow the diffusion process to be partially completed. After the plastic optical fiber has been drawn, the remaining diffusion is accomplished by testing for the specified transmission bandwidth. Similarly, a partially diffused plastic optical fiber may be extruded.

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