Photonic lantern with multimode fibers embedded  

作　　者：Hai-Jiao Yu Qi Yan Zong-Jun Huang He Tian Yu Jiang Yong-Jun Liu Jian-Zhong Zhang Wei-Min Sun 

机构地区：[1]Key Laboratory of In-Fiber Integrated Optics,Ministry of Education,Harbin Engineering University

出　　处：《Research in Astronomy and Astrophysics》2014年第8期1046-1054,共9页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11078009,U1331114,61107059 and 61307076);the 111 project (B13015) to Harbin Engineering University;the Fundamental Research Funds for the Central Universities;the Opening Project of Key Laboratory of Astronomical Optics and Technology,Nanjing Institute of Astronomical Optics and Technology,Chinese Academy of Sciences

摘　　要：A photonic lantem is studied which is formed by seven multimode fibers inserted into a pure silica capillary tube. The core of the tapered end has a uniform refractive index because the polymer claddings are removed before the fibers are inserted. Consequently, the light distribution is also uniform.Two theories describing a slowly varying waveguide and multimode coupling are used to analyze the photonic lantern. The transmission loss decreases as the length of the tapered part increases. For a device with a taper length of 3.4 cm, the loss is about 1.06 dB on average for light propagating through the taper from an inserted fiber to the tapered end and 0.99 dB in the reverse direction. For a device with a taper length of 0.7 cm, the two loss values are 2.63 dB and 2.53 dB, respectively. The results show that it is possible to achieve a uniform light distribution with the tapered end and a low-loss transmission in the device if parameters related to the lantern are reasonably defined.A photonic lantem is studied which is formed by seven multimode fibers inserted into a pure silica capillary tube. The core of the tapered end has a uniform refractive index because the polymer claddings are removed before the fibers are inserted. Consequently, the light distribution is also uniform.Two theories describing a slowly varying waveguide and multimode coupling are used to analyze the photonic lantern. The transmission loss decreases as the length of the tapered part increases. For a device with a taper length of 3.4 cm, the loss is about 1.06 dB on average for light propagating through the taper from an inserted fiber to the tapered end and 0.99 dB in the reverse direction. For a device with a taper length of 0.7 cm, the two loss values are 2.63 dB and 2.53 dB, respectively. The results show that it is possible to achieve a uniform light distribution with the tapered end and a low-loss transmission in the device if parameters related to the lantern are reasonably defined.

关 键 词：TECHNIQUES radial velocities -- methods laboratory -- instrumentation spectrographs 

分 类 号：P111.4[天文地球—天文学]