Low loss optical fiber designs and methods for their manufacture
    1.
    发明申请
    Low loss optical fiber designs and methods for their manufacture 审中-公开
    低损耗光纤设计及其制造方法

    公开(公告)号:US20070003198A1

    公开(公告)日:2007-01-04

    申请号:US11170257

    申请日:2005-06-29

    摘要: The specification describes an improved optical fiber produced by a hybrid VAD/MCVD process. The core of the fiber is produced using VAD and the inner cladding layer has a depressed index and is produced using MCVD. In preferred embodiments, the optical power envelope is essentially entirely contained in VAD produced core material and the MCVD produced depressed index cladding material. Optical loss is minimized by confining most of the optical power to the VAD core where OH presence is low, as well as by maximizing the optical power in the un-doped silica region. The MCVD substrate tube material is essentially devoid of optical power.

    摘要翻译: 本说明书描述了通过混合VAD / MCVD工艺生产的改进的光纤。 使用VAD制造纤维的芯,并且内包层具有凹陷指数,并且使用MCVD制造。 在优选实施例中,光功率包层基本上完全包含在VAD生产的芯材料中,并且MCVD产生凹陷的折射率包层材料。 通过将大部分光功率限制在其中OH存在低的VAD核心以及通过使未掺杂二氧化硅区域中的光功率最大化来将光损耗最小化。 MCVD衬底管材料基本上没有光学功率。

    Manufacture of depressed index optical fibers
    2.
    发明申请
    Manufacture of depressed index optical fibers 审中-公开
    凹陷指数光纤的制造

    公开(公告)号:US20080260339A1

    公开(公告)日:2008-10-23

    申请号:US12148891

    申请日:2008-04-23

    IPC分类号: G02B6/036 C03B37/018

    摘要: Described herein is a method for making a depressed index cladding for the inner cladding of an optical fiber. The method involves making the depressed index cladding in two steps. The innermost portion of the inner cladding is produced using a soot method, thereby deriving the advantages of the soot method for the region of the cladding that carries the most optical power, then forming the remaining portion of the inner cladding layer using a rod-in-tube step. This method effectively marries the advantages and disadvantages of both methods.

    摘要翻译: 这里描述了一种用于制造用于光纤的内包层的凹陷折射率包层的方法。 该方法包括使凹陷的折射率包层分两步进行。 使用烟灰法制造内包层的最内部,从而得到具有最大光焦度的包层的区域的烟灰法的优点,然后使用棒入法形成内包层的剩余部分 立方步。 这种方法有效地结合了两种方法的优缺点。

    Optical fiber for improved performance in S-, C- and L-bands
    4.
    发明申请
    Optical fiber for improved performance in S-, C- and L-bands 有权
    用于提高S,C和L波段性能的光纤

    公开(公告)号:US20050063656A1

    公开(公告)日:2005-03-24

    申请号:US10670013

    申请日:2003-09-24

    摘要: An improved optical fiber design has been found to exhibit a relatively low attenuation at the wavelength of 1385 nm (the “water peak”), allowing for Raman amplification to be efficient and effective at wavelengths in the S-band range of 1460 to 1530 nm. An ultra-dry process is used to mate an inner core rod (core plus surrounding trench) with a cladding tube (ring region plus cladding layers) and provide a water peak loss on the order of 0.325 dB/km. The low water peak is combined with appropriate dispersion values and zero dispersion wavelength to form a fiber that supports transmission and Raman amplification in the S-, C- and L-bands of interest for optical transmission systems.

    摘要翻译: 已经发现改进的光纤设计在1385nm波长(“水峰”)处呈现相当低的衰减,允许拉曼放大在1460至1530nm的S波段范围内的波长下有效和有效 。 使用超干法将内芯棒(芯加周围沟槽)与包层管(环区加覆层)配合,并提供大约0.325 dB / km的水峰值损耗。 将低水峰与适当的色散值和零色散波长组合以形成支持光传输系统感兴趣的S,C和L波段中的透射和拉曼放大的光纤。

    Methods for optical fiber manufacture
    5.
    发明申请
    Methods for optical fiber manufacture 审中-公开
    光纤制造方法

    公开(公告)号:US20050284184A1

    公开(公告)日:2005-12-29

    申请号:US10880205

    申请日:2004-06-29

    摘要: The specification describes a method for addressing defects in the center of the core of an optical fiber that are formed during high temperature steps associated with collapsing a hollow core fabricated by the MCVD, PCVD, or OVD methods. These defects form absorption centers and impair the optical transmission properties of the optical fiber. The defects are reduced or eliminated according to the invention by forming a buffer layer as the last deposited layer before collapse. The buffer layer is undoped, or lightly doped, and provides a diffusion barrier to prevent or slow a change in the oxide glass stoichiometry. The result is that fewer dopant and oxygen atoms exit from the core layers through the free surface during collapse, resulting in fewer defects and lower fiber attenuation.

    摘要翻译: 本说明书描述了一种用于解决在与通过MCVD,PCVD或OVD方法制造的中空芯片相关联的高温步骤期间形成的光纤芯的中心处的缺陷的方法。 这些缺陷形成吸收中心并损害光纤的光传输性能。 通过在崩溃之前形成缓冲层作为最后的沉积层,根据本发明减少或消除缺陷。 缓冲层未掺杂或轻掺杂,并提供扩散阻挡层以防止或减缓氧化物玻璃化学计量的变化。 结果是在塌陷期间,较少的掺杂剂和氧原子通过自由表面从核心层离开,导致较少的缺陷和较低的纤维衰减。