公开(公告)号：US20020122644A1

公开(公告)日：2002-09-05

申请号：US09984891

申请日：2001-10-31

Applicant: The Secretary of State for Defence

Inventor： Timothy A. Birks ,  Jonathan C. Knight ,  Philip St. J. Russell

IPC: G02B006/00 ,  G02B006/02 ,  G02B006/20

CPC classification number: C03B37/01205 ,  B82Y20/00 ,  C03B2201/34 ,  C03B2203/14 ,  C03B2203/42 ,  G02B6/02 ,  G02B6/02333 ,  G02B6/02347 ,  G02B6/02361 ,  G02B6/02371 ,  G02B6/02385 ,  G02B6/1225 ,  G02B6/4296 ,  H01S3/06708

Abstract: A large core photonic crystal fibre for transmitting radiation having a core comprising a substantially transparent core material and having a core diameter of at least 5null. The fibre also comprises a cladding region surrounding the length of core material, wherein the cladding region comprises a first substantially transparent cladding material, having a first refractive index, and wherein the first substantially transparent cladding material has embedded along its length a substantially periodic A array of holes, wherein the holes are filled with a second cladding material having a second refractive index less than the first refractive index, such that radiation input to the optical fibre is transmitted along the length of the core material in a single mode of propagation. In a preferred embodiment, the core diameter may be at least 20null, and may be as large as 50null. The fibre is capable of transmitting higher power radiation than conventional fibres, whilst maintaining propagation in a single mode. The core material may be doped with a material capable of providing amplification under the action of pump radiation input to the fibre. The invention also relates to a fibre amplifier and a fibre laser comprising a doped large core photonic crystal fibre. The fibre may also be used in a system for transmitting radiation comprising a plurality of lengths of large core photonic crystal fibre, separated by large core photonic crystal fibre amplifiers, such that the power of radiation transmitted through the system is maintained above a predetermined threshold power.

Abstract translation: 一种用于传输辐射的大型核心光子晶体光纤，其具有包括基本上透明的芯材并具有至少5mu的芯直径的芯。 光纤还包括围绕芯材长度的包层区域，其中包层区域包括具有第一折射率的第一基本上透明的覆层材料，并且其中第一基本上透明的覆层材料沿其长度嵌入基本上周期性的A阵列 的孔，其中所述孔填充有具有小于第一折射率的第二折射率的第二覆层材料，使得输入到光纤的辐射沿着芯材料的长度以单一传播模式传输。 在优选实施例中，芯直径可以至少为20mu，并且可以大至50mu。 光纤能够传输比常规光纤更高的功率辐射，同时保持在单一模式下的传播。 芯材料可以掺杂有能够在泵浦辐射输入到纤维的作用下提供放大的材料。 本发明还涉及一种光纤放大器和包括掺杂大芯光子晶体光纤的光纤激光器。 该光纤还可用于传输辐射的系统，该系统包括由大型核心光子晶体光纤放大器分离的多个长度的大芯光子晶体光纤，使得通过系统传输的辐射功率保持在预定阈值功率以上 。