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Optica Publishing Group
  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper CJ6_6

Realizing optical amplifiers with micro-sphere: A 15 dB gain, 2 dB noise-figure, tiny amplifier

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Abstract

Studies on micro-sphere or micro-disks have retained a lot of attention in the past years in order to realize cavity with high Quality (Q) factor, lasers, sensors [1], or very wavelength-selective filter, which can be used as regenerating functions for optical telecommunication [2], Different types of materials (silica, oxide glasses, ZBLALiP) and dopants (Erbium ... ) have been tested. The propagation of light inside a sphere is supported through Whispering Gallery Modes and the coupling through evanescent wave is a critical point to ensure a good efficiency of the pump and a good collection of the laser light. Typical values are in the range 10-100 μmeters for sphere diameters and 109 for the Q factor. In all the examples of application given above, it is primordial to have a good Q factor. Therefore, a good surface quality must be obtained for the micro-sphere, which means that photons makes many turn-around inside the cavity before having a chance to escape from the cavity.

© 2007 IEEE

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