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Software-supported Development of Optical Components

Software-supported Development of Optical Components. 2007 AutoOptics Short Course at Harz University Dipl.-Ing. Matthias Haupt IuK-Center Wernigerode Email: mhaupt@hs-harz.de. Overview. Advantages of computer aided optic design

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Software-supported Development of Optical Components

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  1. Software-supported Development of Optical Components 2007 AutoOptics Short Course at Harz University Dipl.-Ing. Matthias Haupt IuK-Center Wernigerode Email: mhaupt@hs-harz.de

  2. Overview • Advantages of computer aided optic design • An example of optic design: A Demultiplexer for WDM over POF • From the basic idea to the design • Analysis function given by the optic design program • Optimization of the optic design • Another attempt for a demultiplexer

  3. Advantages of Computer aided Optic Design • An inexpensive way to design optical components • Time saving • Improvements can be realized fast • Performance of optical components can be proved and compared with other setups • Easy optimization of material

  4. OpTaliX Features of OpTaliX • Sequential and non-sequential ray tracing • Full geometrical and diffraction analysis • User-defined graphics  Same functionality as “high-end” products(ZEMAX / OSLO) http://www.optenso.de

  5. Motivation for VIS-WDM over POF The applications for POF have high demand on bandwidth! • Standard optical transmission system: One wavelength carries the information  Limitation in bandwidth Problem! • New technology: VIS-WDM over POF Multiple wavelengths carry information  A multiple of bandwidth is possible  Multiplexer and Demultiplexer are needed

  6. Patented basic concept • Principlesetup of theVIS-WDM demultiplexer(unscaled)

  7. Patented basic concept: Lens • Function: to focus light onto detection layer • To minimize spherical aberrations  2 plano convex lenses simple biconvex lens lens “best form” distribution of refraction power in two lenses aspheric, almost plano convex lens

  8. Patented basic concept: Prism • Prism separates monochromatic parts of light • Separation of colors by high dispersive materials (low Abbe Number V) nD(λ)= 598.2nm nF(λ)= 486.1nm nC(λ)= 656.3nm

  9. Aberrations of Lenses and Mirrors (I) • 2 aspheric Lenses to show spherical and chromatic aberrations

  10. Aberrations of Lenses and Mirrors (II) • Spherical and Chromatic Aberrations lead to a large Spot Size

  11. First Results (I)

  12. First Results (II) • Spot diagram: collects the transverse aberrations in the image plane • Spherical and chromatic aberrations avoid better results

  13. Aberrations of Lenses and Mirrors (III) • 2 off-axis parabolic mirrors

  14. Aberrations of Lenses and Mirrors (IV) • A perfect point to point projection without any aberrations

  15. Aberrations of Lenses and Mirrors (V) • Second off-axis source(green rays)

  16. Aberrations of Lenses and Mirrors (VI) • Large spot size of off-axis source Tolerancing is more difficult with mirrors

  17. Improved Results (I)

  18. Improved Results (II) • Low aberrations  all colors can be detected • Gap between colors is large enough for photodiodes • Cross-talk lower than 30dB

  19. Another Attempt (I) • Focusing done by an aspherical mirror • Separating done by a grating • Setup much smaller

  20. Another Attempt (II) • Every color can be separated with gap >2mm • Lower transitions of materials with different refractive indexes higher intensity

  21. Conclusion • Computer aided optic design is a fast and cheap method to design optical components • OpTaliX allows to evaluate the optical design and to optimize the results • Designs can be compared with each other easily

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