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Pulse distortion in optical fibers with transverse offset splices
Applied Optics
|March 24, 2010
Summary
Pulse distortion in spliced multimode optical fibers is analyzed. Graded-index fibers show reduced pulse width with misalignment, while step-index fibers remain unaffected, aligning with theoretical predictions.
Area of Science:
- Optical Engineering
- Telecommunications
- Fiber Optics
Background:
- Multimode optical fibers are crucial for data transmission.
- Splices in optical fibers can introduce signal distortions.
- Understanding pulse distortion is key to maintaining signal integrity.
Purpose of the Study:
- To present a method for calculating pulse distortion in spliced multimode optical fibers.
- To investigate the impact of transverse misalignment on pulse distortion.
- To compare theoretical predictions with experimental measurements.
Main Methods:
- Developed a method to calculate pulse distortion versus transverse misalignment.
- Conducted measurements on two graded-index and one step-index optical fibers.
- Analyzed the root-mean-square (rms) pulse width under varying splice conditions.
Main Results:
- Graded-index fibers exhibited a rapid decrease in rms pulse width with increasing transverse misalignment.
- Discrepancies in graded-index fibers at smaller offsets were partially explained by unequal mode excitation.
- Investigated the effect of varying splice section lengths.
- Step-index fibers showed no significant variation in rms pulse width, consistent with theory.
Conclusions:
- Transverse misalignment significantly impacts pulse distortion in graded-index multimode fibers.
- Unequal mode excitation conditions influence pulse distortion in graded-index fibers.
- Theoretical models accurately predict the behavior of step-index fibers concerning pulse distortion from misalignment.
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