Mode field radius definitions for arbitrary planar single-mode optical waveguides and their relations to splice loss and propagation constant

1988 ◽  
Vol 24 (16) ◽  
pp. 1011 ◽  
Author(s):  
A.H. Liang ◽  
C.C. Fan
Keyword(s):  
Optical Waveguides ◽  
Propagation Constant ◽  
Single Mode ◽  
Splice Loss ◽  
Mode Field

Splice Loss Optimization of Single Mode Fiber and Erbium Doped Fiber—Experiments and Issues

2003 ◽  
Author(s):  
Salil Pradhan ◽  
John Arbulich ◽  
K. Srihari
Keyword(s):  
Noise Figure ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Optical Signals ◽  
Splice Loss ◽  
Mode Field ◽  
Mode Field Diameter ◽  
Erbium Doped ◽  
Spectral Attenuation ◽  
The One

In metro and long haul networking applications, Erbium Doped Fiber Amplifiers (EDFAs) are used to amplify weak optical signals. Manufacturing of EDFAs is primarily a fusion splicing process in which both Single Mode Fibers (SMFs) and Erbium Doped Fibers (EDFs) are utilized. One of the critical operations is the splicing of an SMF to an EDF, a dissimilar fiber splicing process. Splice losses between these fibers need to be optimized, and the process is highly reliant on the properties of the EDF. Mode Field Diameter (MFD), spectral attenuation at peak wavelength and concentration of erbium along its length vary from batch to batch. The splice loss is dependent on some of these properties and must be taken into consideration. With this background, research was conducted to study the properties of EDFs and its applicability in the splicing process. Having considered the characteristics of the EDF in different wavelength regions, experiments were designed to optimize the losses between an SMF and an EDF. In the C-band (1525–1565 nm), erbium atoms absorb most of the transmitted power (in absence of a 980/1480 nm laser pump). Splice losses measured in these regions are dependent upon the absorption properties and would not depict a true picture of the splice loss. Since the incident power is absorbed, an alternate approach would be to launch extremely low power (<−27 dBm). In this case, the absorption losses should be minimal. As C-band is highly absorptive, launching power in the range of 1310 nm would be another possible scenario. The ‘cutback’ method was also employed to determine the losses in the C-band region. Statistical methods such as the Design of Experiments (DOE) were used to study the properties of the EDF and its response to various splicing parameters and wavelengths. Splice loss trends at various power levels were also investigated. The primary intent of these experiments was to translate the results and their utility into the manufacturing of EDFAs, wherein a multitude factors creep into the splicing scenario. The best method would be the one that consistently yields a low splice loss, since these are critical to minimize the noise figure of the EDFA.

scholarly journals Analysis of Splice Loss of Single-Mode Optical Fiber in the High Altitude Environment

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 876
Author(s):  
Liwen Hu ◽  
Chaowei Yuan
Keyword(s):  
High Altitude ◽  
Atmospheric Pressure ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Plain Area ◽  
Splice Loss ◽  
Mode Field ◽  
Mode Field Diameter ◽  
High Altitude Area ◽  
Effects Of Temperature

Up to now, there have been no complete theoretical researches and field experiment reports on the fiber fusion loss at high altitude. Therefore, we have conducted an exploratory study on the fiber splicing loss at high altitude, and firstly analyze the influence of mode field diameter mismatch, axial offset, angle tilt or end face gap affected by high altitude on splice loss, and then discuss the influence of fusion-splicing parameters on splice loss. Besides, a mathematical model for reducing the splicing loss of single-mode fiber at high altitude is established by combining the effects of temperature, humidity, oxygen content, atmospheric pressure, gale and gravity. We have conducted repeated field fusion experiments in different altitude areas (53, 2980, 4000, 4200, 4300, 5020, and 5200 m) more than once, hence obtaining a large number of field experimental data, making a deep comparison between typical “plain” area and typical “high altitude” area. The splice loss of most fusion points achieved successfully has been reduced by at least 0.07 dB. The simulation results are basically consistent with the theoretical analysis. Ultimately, the method proposed has been directly applied to on-site splicing engineering in high altitude environment and achieves good results.

Numerical Method Approaches in Optical Waveguide Modeling

2011 ◽  
Vol 52-54 ◽  
pp. 2133-2137 ◽  
Author(s):  
Mohd Muzafar Ismail ◽  
Muhammad Noorazlan Shah Zainudin
Keyword(s):  
Numerical Method ◽  
Optical Waveguide ◽  
Optical Waveguides ◽  
Propagation Constant ◽  
Single Mode ◽  
Basic Structure ◽  
Propagation Characteristic ◽  
Parameter Study ◽  
Matlab Programming ◽  
Straight Waveguide

Optical waveguides have been known as basic structure in integrated optics. The result of waveguide analysis is very useful to apply before fabrication process begins. In this paper, optical propagation characteristic of straight waveguide on light intensity distribution within the structures have been investigated at 1.55 micrometer waveguide. The normalized propagation constant b and effective refractive index neff conditions have been considered for the straight waveguide for single mode propagation. Both the propagation characteristic can be calculated efficiently on the personal computer by using MATLAB programming. The analysis has been analyzed using a numerical method based on finite difference method approach. The result of optimization analysis of waveguide according to the parameter study can help in practical work in designing an optical waveguide easily.

scholarly journals High-Precision Propagation-Loss Measurement of Single-Mode Optical Waveguides on Lithium Niobate on Insulator

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 612 ◽  
Author(s):  
Jintian Lin ◽  
Junxia Zhou ◽  
Rongbo Wu ◽  
Min Wang ◽  
Zhiwei Fang ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
High Precision ◽  
Optical Waveguides ◽  
Single Mode ◽  
Propagation Loss ◽  
Field Size ◽  
High Precision Measurement ◽  
Mode Field ◽  
Optical Patterning ◽  
Measurement Approach

We demonstrate the fabrication of single-mode optical waveguides on lithium niobate on an insulator (LNOI) by optical patterning combined with chemomechanical polishing. The fabricated LNOI waveguides had a nearly symmetric mode profile of ~2.5 µm mode field size (full-width at half-maximum). We developed a high-precision measurement approach by which single-mode waveguides were characterized to have propagation loss of ~0.042 dB/cm.

scholarly journals High-Precision Measurement of a Propagation Loss of Single-Mode Optical Waveguides on Lithium Niobate On Insulator

2019 ◽  
Author(s):  
Jintian Lin ◽  
Junxia Zhou ◽  
Rongbo Wu ◽  
Min Wang ◽  
Zhiwei Fang ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
High Precision ◽  
Precision Measurement ◽  
Optical Waveguides ◽  
Single Mode ◽  
Propagation Loss ◽  
Field Size ◽  
High Precision Measurement ◽  
Mode Field ◽  
Optical Patterning

We demonstrate fabrication of single-mode optical waveguides on lithium niobate on insulator (LNOI) by optical patterning combined with chemo-mechanical polishing. The fabricated LNOI waveguides have a nearly symmetric mode profile of a mode field size of ~2.5 µm (full-width at half maximum). We develop a high-precision measurement approach by which the single mode waveguides are characterized to have a propagation loss of ~0.042 dB/cm.

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