unit 3

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Across
  1. 2. dose not exhibit catastrophic degradation
  2. 4. higher external power efficiency than the planar LED
  3. 7. impurity give up an electron to the conduction band
  4. 10. cavity has mirror at both ends
  5. 12. onter- shell electrons
  6. 13. source that compatible with SMF
  7. 14. region where radiative recombination takes place
Down
  1. 1. on which depletion width increases
  2. 3. invasion population of upper energy level is greater than population of cower energy level
  3. 5. geometry which provides optical confinement in vertical direction
  4. 6. perfect material containing no impurities
  5. 8. Fermi level closer to conduction band
  6. 9. distortion drawback of LED
  7. 11. desirable spectral width for optical source
  8. 15. heterojunction- structure