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    Method of fabricating preforms doped with rare earth metal for optical fibers
    193.
    发明公开
    Method of fabricating preforms doped with rare earth metal for optical fibers 有权
    的一种制造具有用于光纤稀土金属掺杂预制件的方法

    公开(公告)号：EP1043281A1

    公开(公告)日：2000-10-11

    申请号：EP00302943.6

    申请日：2000-04-07

    Applicant: SPECTRAN CORPORATION

    Inventor： Tankala, Kanisha

    IPC: C03B37/018

    CPC classification number: C03B37/01838 ,  C03B2201/10 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/34 ,  C03B2201/36

    Abstract: The present invention discloses a method of fabricating rare earth-doped preforms for optical fibers. A silica soot is deposited as a layer with high porosity on an inner surface of a silica-based tube by a modified chemical vapor deposition (MCVD) process at a temperature high enough to produce the silica soot but low enough to avoid sintering of the soot into the silica-based tube. The silica-based tube is then immersed in a solution including a rare earth element and optionally a codopant element for impregnation. The excess solution is drained and the silica-based tube is dried in a stream of chlorine and inert gas at an elevated temperature. Then, the rare earth element and the optional codopant element are oxidized under an oxygen partial pressure at a temperature high enough to overcome kinetic limitations against oxidation. Finally, the soot layer is consolidated while flowing oxygen and optionally a mixture of chlorides of a second codopant element at a sintering temperature at which the second codopant element reacts with oxygen to form codopant oxide which is delivered around the rare earth element oxide deposited in the soot layer. In the method of the current invention, one or more rare earth elements are codoped with preferred codopants including but not limited to Ge, Al, P and/or B to enhance the performance of the rare earth ions. Other dopants may also be used in conjunction with the preferred dopants for modifying the refractive index of the core.

    Abstract translation: 本发明光盘松散光学纤维制造稀土掺杂预制件的方法。 一二氧化硅烟灰被沉积为通过改进的化学汽相淀积与在二氧化硅基管的内表面的高孔隙率的层（MCVD）在足够高以产生二氧化硅烟灰，但足够低的温度下处理，以避免烟灰的烧结 到二氧化硅基管。 然后将该二氧化硅基管被浸没在溶液中包含的稀土类元素和用于浸渍一个OPTIONALLY共掺杂剂元素。 将沥干过剩的溶液以及所述二氧化硅基管在高温下氯和惰性气体流中干燥。 然后，稀土类元素和任选的共掺杂剂元素在高到足以克服抗氧化动力学限制温度的氧分压下氧化。 最后，虽然流动氧气并且在所述第二共掺杂剂元素与氧反应烧结温度的第二共掺杂剂元素的氯化物的任选的混合物中以形成共掺杂剂氧化物的所有这是在所沉积的稀土元素氧化物周围输送的烟灰层固结 烟灰层。 在本发明的方法中，一种或多种稀土元素的共掺杂的与优选的共掺杂剂包括但不限于锗，铝，磷和/或B以提高稀土离子的性能。 其它掺杂剂因此可以在结合使用用于改变纤芯的折射率优选的掺杂剂。

    Reare earth doped optical fibre amplifiers
    197.
    发明公开
    Reare earth doped optical fibre amplifiers 失效
    Mit seltenen Erden dotierte faseroptischeVerstärker。

    公开(公告)号：EP0602467A1

    公开(公告)日：1994-06-22

    申请号：EP93119433.6

    申请日：1993-12-02

    Applicant: PIRELLI CAVI S.p.A.

    Inventor： Roba, Giacomo Stefano

    IPC: G02B6/22 ,  H01S3/06 ,  C03C13/04

    CPC classification number: G02B6/0365 ,  C03B37/01807 ,  C03B37/01838 ,  C03B2201/10 ,  C03B2201/12 ,  C03B2201/14 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/34 ,  C03B2201/36 ,  C03B2203/22 ,  C03C13/046 ,  G02B6/03644 ,  H01S3/06708 ,  H01S3/06729 ,  H01S3/094011 ,  H01S3/1691

    Abstract: An optical amplifier for amplifying an optical signal having a signal wavelength λ s , comprises an optical fibre (20) having an erbium doped core (34) surrounded by cladding (42, 32, 30), a pump (22) for pumping the fibre with pump light at a pump wavelength λ p coupled to the fibre, said erbium doped optical fibre having a NA higher than 0.2, the difference in the coefficient of thermal expansion of the core adjacent the core/cladding interface and the coefficient of thermal expansion of the cladding at at least one radius less than 2µm from said interface being lower than a predetermined value, corresponding to a ratio of erbium loss to background loss, at said pump wavelength, greater than a minimum ratio calculated by a given increasing function of the ratio erbium loss/background loss versus erbium loss, in which said minimum ratio is about 20 when erbium loss is 0.15 dB/m and about 120 when erbium loss is 3.5 dB/m.

    Abstract translation: 一种用于放大具有信号波长λs的光信号的光放大器，包括光纤（20），其具有由包层（42,32,30）围绕的掺铒芯体（34），泵浦（22） 泵浦光以与泵浦波长λp耦合的光纤，所述铒掺杂光纤的NA高于0.2，核心/包层界面附近的芯体的热膨胀系数与热膨胀系数之差 所述界面处的至少一个小于2μm的半径的包层低于在所述泵浦波长处的铒损耗与背景损耗的比率的预定值，大于通过给定的增加函数计算的最小比率 铒损耗/背景损耗与铒损耗的比率，其中当铒损耗为0.15dB / m时，所述最小比为约20，当铒损耗为3.5dB / m时，所述最小比为约120。

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