VIEWS: 5 PAGES: 16 POSTED ON: 10/18/2012
COUPLING EFFICIENCY FOR SINGLE MODE FIBERS AND FIBER-OPTIC ALIGNMENT AUTOMATION A PRESENTATION BY: Shubham Bhat email@example.com Overview • Gaussian Beam analysis • Losses (Intrinsic and Extrinsic) • Mechanical misalignments (Lateral, Longitudinal and Angular) • Fiber-optic alignment automation • Hill-climbing algorithm • Drawbacks of hill-climbing algorithm • A proposed novel feed-forward controlling algorithm • Conclusion Gaussian Beam Coupling Efficiency Source Efficiency = Source wave function = Modal wave function Power- Coupling efficiency Total efficiency Coupling Efficiency Contd. Losses LOSS Intrinsic losses Reflection losses Extrinsic losses • NA effects • Lateral Misalignment • Fiber-radius effects • Longitudinal Misalignment • Index-Profile effects • Angular Misalignment • Core concentricity within cladding • Fabrication tolerances Longitudinal Misalignment Angular Misalignment Lateral Misalignment Current technology 6 DEGREES OF FREEDOM Array Waveguide Grating PLC Fiber-Fiber Alignment Automation Drawbacks of Hill-Climbing Cutting off at Local Maxima Hill climbing Vs Smart Algorithm Smart Algorithm Hill climbing algorithm Smart Algorithm Conclusion • Longitudinal misalignment is less critical than angular and lateral misalignment. • Dominant loss arises from lateral displacement in single mode fibers. • Hill-climbing algorithm is time-consuming and has the potential drawback of missing the actual peak. • A novel Algorithm using a feed forward controlling technique is proposed which takes care of the disadvantages of hill climbing method.
Pages to are hidden for
"COUPLING EFFICIENCY FOR SINGLE MODE FIBERS Drexel ECE"Please download to view full document