Novel trial field of single-mode graded-index fibres usable for non-Gaussian field distributions

1986 ◽  
Vol 22 (20) ◽  
pp. 1070 ◽  
Author(s):  
K. Hayata ◽  
M. Koshiba ◽  
M. Suzuki
Keyword(s):  
Single Mode ◽  
Gaussian Field ◽  
Graded Index ◽  
Field Distributions ◽  
Trial Field ◽  
Non Gaussian ◽  
Graded Index Fibres

Effect of misalignment on coupling efficiency in laser diode to single-mode circular core graded-index fiber coupling via cylindrical microlens on the fiber tip

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Biplab Kumar Ray ◽  
Mithun Maity ◽  
Sankar Gangopadhyay ◽  
Anup Kumar Maiti
Keyword(s):  
Laser Diode ◽  
Coupling Efficiency ◽  
Vertical Plane ◽  
Poor Performance ◽  
Single Mode ◽  
Potential Candidate ◽  
Gaussian Field ◽  
Fiber Coupling ◽  
Graded Index ◽  
User Friendly

Abstract We report here the first theoretical prediction of coupling efficiency of the laser diode to single-mode graded-index fiber coupling via cylindrical microlens on the tip of the fiber in presence of possible transverse and angular mismatches. Moderately efficient cylindrical microlens on the fiber is easily fabricable and graded-index fiber has less sensitivity to macro as well as micro bending. Thus this coupling device emerges as a potential candidate in the field of coupling optics. The analysis takes into consideration the allowable aperture provided by cylindrical microlens. Further, we shall consider here the coupling in the vertical plane only since the coupling in the horizontal plane has poor performance. Using the relevant ABCD matrix of refraction for a cylindrical lens in the vertical plane, we prescribe analytical expressions of the coupling efficiencies in presence of said kinds of misalignments. In our analysis, we use Gaussian field distribution for both the laser and fiber fields. We carry on our investigation for two commonly used wavelengths namely 1.3 and 1.5 µm. As an example of graded-index fiber, we use some typical step, parabolic, and triangular index fibers in our study. The execution of the prescribed formulations involves little computation. Thus the evaluation of the concerned coupling efficiencies is very much user friendly. The present analysis surfaces the tolerance factors of the coupling devices. Accordingly, the results will prove beneficial to designers and packagers in respect of the design of such coupler involving cylindrical microlens in the field of optimum launch optics.

Mode-field diameter measurements for single-mode fibers with non-Gaussian field profiles

1987 ◽  
Vol 5 (2) ◽  
pp. 211-217 ◽  
Author(s):  
W. Anderson ◽  
V. Shah ◽  
L. Curtis ◽  
A. Johnson ◽  
J. Kilmer
Keyword(s):  
Single Mode ◽  
Gaussian Field ◽  
Mode Field ◽  
Mode Field Diameter ◽  
Non Gaussian

A Simple Method for Prediction of Effective Core Area and Index of Refraction of Single-mode Graded Index Fiber in the Low V Region

2014 ◽  
Vol 35 (4) ◽  
Author(s):  
Angshuman Majumdar ◽  
Satabdi Das ◽  
Sankar Gangopadhyay
Keyword(s):  
Refractive Index ◽  
Single Mode ◽  
Index Of Refraction ◽  
Core Area ◽  
Exact Results ◽  
Simple Method ◽  
Graded Index ◽  
Core Areas ◽  
V Region ◽  
User Friendly

AbstractBased on the simple power series formulation of fundamental mode developed by Chebyshev formalism in the low V region, we prescribe analytical expression for effective core area of graded index fiber. Taking step and parabolic index fibers as examples, we estimate the effective core areas as well as effective refractive index for different normalized frequencies (V number) having low values. We also show that our estimations match excellently with the available exact results. The concerned predictions by our method require little computation. Thus, this simple but accurate formalism will be user friendly for the system engineers.

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