Novel spot-size converter for broadband and polarization insensitive coupling to conventional single-mode fiber

2019 ◽  
Author(s):  
Niharika Kohli ◽  
Winnie N. Ye
Keyword(s):  
Single Mode ◽  
Spot Size ◽  
Single Mode Fiber ◽  
Polarization Insensitive

scholarly journals Analysis of Design and Fabrication Parameters for Lensed Optical Fibers as Pertinent Probes for Sensing and Imaging

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4150 ◽  
Author(s):  
Soongho Park ◽  
Sunghwan Rim ◽  
Ju Kim ◽  
Jinho Park ◽  
Ik-Bu Sohn ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Single Mode ◽  
Spot Size ◽  
Single Mode Fiber ◽  
Fiber Probe ◽  
Optical Fiber Probe ◽  
Working Distance ◽  
Physical Sensing ◽  
Fabrication Parameters

A method for adjusting the working distance and spot size of a fiber probe while suppressing or enhancing the back-coupling to the lead-in fiber is presented. As the optical fiber probe, a lensed optical fiber (LOF) was made by splicing a short piece of coreless silica fiber (CSF) on a single-mode fiber and forming a lens at the end of the CSF. By controlling the length of the CSF and the radius of lens curvature, the optical properties of the LOF were adjusted. The evolution of the beam in the LOF was analyzed by using the Gaussian ABCD matrix method. To confirm the idea experimentally, 17 LOF samples were fabricated and analyzed theoretically and also experimentally. The results show that it is feasible in designing the LOF to be more suitable for specific or dedicated applications. Applications in physical sensing and biomedical imaging fields are expected.

A viable spot-size converter for coupling between a single-mode fiber and a silicon-wire waveguide

2014 ◽  
Author(s):  
Kazuo Shiraishi ◽  
Ryutaro Takasaki ◽  
Hidehiko Yoda ◽  
Hideya Oshikiri ◽  
Chen S. Tsai
Keyword(s):  
Single Mode ◽  
Spot Size ◽  
Single Mode Fiber

scholarly journals Single-mode fiber microlens with controllable spot size

1991 ◽  
Vol 30 (15) ◽  
pp. 1958 ◽  
Author(s):  
Chris W. Barnard ◽  
John W. Y. Lit
Keyword(s):  
Single Mode ◽  
Spot Size ◽  
Single Mode Fiber

scholarly journals A two-port polarization-insensitive coupler module between single-mode fiber and silicon-wire waveguide

2012 ◽  
Vol 20 (22) ◽  
pp. 24370 ◽  
Author(s):  
Kazuo Shiraishi ◽  
Hidehiko Yoda ◽  
Chen S. Tsai
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Polarization Insensitive

Analysis of Influence of Beam Expender Parameters on Coupling Efficiency of Single Mode Fiber Used in Lidar

2013 ◽  
Vol 552 ◽  
pp. 339-344 ◽  
Author(s):  
Hong Jiang Sheng ◽  
Jian Dong Mao ◽  
Xue Sheng Li
Keyword(s):  
Coupling Efficiency ◽  
Single Mode ◽  
Spot Size ◽  
Single Mode Fiber ◽  
Propagation Theory ◽  
Laser Propagation ◽  
Theoretical Function ◽  
Spot Radius ◽  
Numerical Computing ◽  
The Relationship

Based on theoretical analysis, the beam expender used in all fiber lidar with a coupling efficiency of single mode fiber (SMF) is investigated. Some numerical computations are carried out and following results are obtained. For all fiber lidar in order to get the maximum coupling efficiency on SMF, the relationship between the distance d, ranged from the secondary to primary lens of the beam expender, and the laser waist spot location l, which is at a distance from the secondary lens of beam expender are obtained. And also the relationship between l and the measurable bandwidth is analyzed. Under the condition that if the laser location is certain and the imagine spot location is infinite, with adjusting the distance d which can make the image spot size obtain its minimum, the maximum coupling efficiency about 70.6% is got and the adjusting range of d has only 0.2~0.9mm. Assuming that the image spot distance is infinite, and the minimum of spot radius is got after the laser waist spot goes through the beam expender, the function between d and l is retrieved by use of laser propagation theory. By comparing the theoretical curve with the computing one, the theoretical function agrees with the numerical computing curve approximately. These conclusions have the important directive significance for design of all fiber Lidar.

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