Fundamental-mode spot-size measurement in single-mode optical fibers

1982 ◽  
Author(s):  
F. Alard ◽  
P. Sansonetti ◽  
L. Jeunhomme
Keyword(s):  
Optical Fibers ◽  
Fundamental Mode ◽  
Single Mode ◽  
Spot Size ◽  
Size Measurement

Erratum: Reply to Comment on ‘Fundamental mode spot-size measurement in single-mode optical fibres’

1982 ◽  
Vol 18 (21) ◽  
pp. 936
Author(s):  
F. Alard ◽  
L. Jeunhomme ◽  
M. Monerie ◽  
P. Sansonetti ◽  
C. Vassallo
Keyword(s):  
Fundamental Mode ◽  
Single Mode ◽  
Spot Size ◽  
Optical Fibres ◽  
Size Measurement

Fundamental mode spot-size measurement in single-mode optical fibres

1981 ◽  
Vol 17 (25-26) ◽  
pp. 958 ◽  
Author(s):  
F. Alard ◽  
L. Jeunhomme ◽  
P. Sansonetti
Keyword(s):  
Fundamental Mode ◽  
Single Mode ◽  
Spot Size ◽  
Optical Fibres ◽  
Size Measurement

Reply: Fundamental mode spot-size measurement in single-mode optical fibres

1982 ◽  
Vol 18 (16) ◽  
pp. 693
Author(s):  
F. Alard ◽  
L. Jeunhomme ◽  
M. Monerie ◽  
P. Sansonetti ◽  
C. Vassallo
Keyword(s):  
Fundamental Mode ◽  
Single Mode ◽  
Spot Size ◽  
Optical Fibres ◽  
Size Measurement

scholarly journals Photonic Jet-Shaped Optical Fiber Tips versus Lensed Fibers

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 373
Author(s):  
Djamila Bouaziz ◽  
Grégoire Chabrol ◽  
Assia Guessoum ◽  
Nacer-Eddine Demagh ◽  
Sylvain Lecler
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Single Mode ◽  
Spot Size ◽  
Base Diameter ◽  
Core Diameter ◽  
Focus Spot ◽  
Photonic Jet ◽  
Focus Spot Size ◽  
Focusing Properties

Shaped optical fiber tips have recently attracted a lot of interest for photonic jet light focusing due to their easy manipulation to scan a sample. However, lensed optical fibers are not new. This study analyzes how fiber tip parameters can be used to control focusing properties. Our study shows that the configurations to generate a photonic jet (PJ) can clearly be distinguished from more classical-lensed fibers focusing. PJ is a highly concentrated, propagative light beam, with a full width at half maximum (FWHM) that can be lower than the diffraction limit. According to the simulations, the PJs are obtained when light is coupled in the guide fundamental mode and when the base diameter of the microlens is close to the core diameter. For single mode fibers or fibers with a low number of modes, long tips with a relatively sharp shape achieve PJ with smaller widths. On the contrary, when the base diameter of the microlens is larger than the fiber core, the focus point tends to move away from the external surface of the fiber and has a larger width. In other words, the optical system (fiber/microlens) behaves in this case like a classical-lensed fiber with a larger focus spot size. The results of this study can be used as guidelines for the tailored fabrication of shaped optical fiber tips according to the targeted application.

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.

scholarly journals Novel Low-Loss Fiber-Chip Edge Coupler for Coupling Standard Single Mode Fibers to Silicon Photonic Wire Waveguides

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 79
Author(s):  
Siwei Sun ◽  
Ying Chen ◽  
Yu Sun ◽  
Fengman Liu ◽  
Liqiang Cao
Keyword(s):  
Optical Fibers ◽  
Silicon Photonics ◽  
Coupling Efficiency ◽  
Single Mode ◽  
Spot Size ◽  
Silicon On Insulator ◽  
Multiple Structure ◽  
Silicon Photonic ◽  
Mode Size ◽  
Photonic Wire

Fiber-to-chip optical interconnects is a big challenge in silicon photonics application scenarios such as data centers and optical transmission systems. An edge coupler, compared to optical grating, is appealing to in the application of silicon photonics due to the high coupling efficiency between standard optical fibers (SMF-28) and the sub-micron silicon wire waveguides. In this work, we proposed a novel fiber–chip edge coupler approach with a large mode size for silicon photonic wire waveguides. The edge coupler consists of a multiple structure which was fulfilled by multiple silicon nitride layers embedded in SiO2 upper cladding, curved waveguides and two adiabatic spot size converter (SSC) sections. The multiple structure can allow light directly coupling from large mode size fiber-to-chip coupler, and then the curved waveguides and SSCs transmit the evanescent field to a 220 nm-thick silicon wire waveguide based on the silicon-on-insulator (SOI) platform. The edge coupler, designed for a standard SMF-28 fiber with 8.2 μm mode field diameter (MFD) at a wavelength of 1550 nm, exhibits a mode overlap efficiency exceeding 95% at the chip facet and the overall coupling exceeding 90%. The proposed edge coupler is fully compatible with standard microfabrication processes.

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