Propagation characteristics of single mode step index linear and non-linear optical fiber involving improved Lorentzian approximation for the fundamental mode

2012 ◽  
Author(s):  
Pratap Kumar Bandyopadhyay ◽  
S. N. Sarkar
Keyword(s):  
Optical Fiber ◽  
Fundamental Mode ◽  
Single Mode ◽  
Propagation Characteristics ◽  
Step Index ◽  
Non Linear ◽  
Linear Optical

scholarly journals Optical Fiber Cladding SPR Sensor Based on Core-Shift Welding Technology

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1202 ◽  
Author(s):  
Yong Wei ◽  
Jiangxi Hu ◽  
Ping Wu ◽  
Yudong Su ◽  
Chunlan Liu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Light Field ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Multimode Fiber ◽  
Fiber Core ◽  
Step Index ◽  
Spr Sensor ◽  
Welding Technology ◽  
Core Shift

The typical structure of an optical fiber surface plasmon resonance (SPR) sensor, which has been widely investigated, is to produce the SPR phenomenon by the transmission of light in a fiber core. The traditional method is to peel off the fiber cladding by complex methods such as corrosion, polishing, and grinding. In this paper, the transmitted light of a single-mode fiber is injected into three kinds of fiber cladding by core-shift welding technology to obtain the evanescent field directly between the cladding and the air interface and to build the Kretschmann structure by plating with a 50-nm gold film. The SPR sensing phenomenon is realized in three kinds of fiber cladding of a single-mode fiber, a graded-index multimode fiber, and a step-index multimode fiber. For the step-index multimode fiber cladding SPR sensor, all the light field energy is coupled to the cladding, leading to no light field in the fiber core, the deepest resonance valley, and the narrowest full width at half maximum. The single-mode fiber cladding SPR sensor has the highest sensitivity, and the mean sensitivity of the probe reaches 2538 nm/RIU (refractive index unit) after parameter optimization.

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