Optical: systems and elements – Optical amplifier – Particular active medium
Reexamination Certificate
2004-11-10
2009-02-03
Bolda, Eric (Department: 3663)
Optical: systems and elements
Optical amplifier
Particular active medium
C438S029000, C438S045000
Reexamination Certificate
active
07486437
ABSTRACT:
Methods and corresponding apparatus for optical amplification in semiconductors, particularly indirect band-gap semiconductors, and most particularly in silicon. A first aspect of the invention employs certain doping elements to provide inter-band-gap energy levels in combination with optical or current-injection pumping—The doping element, preferably a noble metal and most preferably Gold, is chosen to provide an energy level which enables an energy transition corresponding to a photon of wavelength equal to the signal wavelength to be amplified. The energy transition may be finely “adjusted” by use of standard doping techniques (such as n-type or p-type doping) to alter the conduction and valence band energy levels and thereby also the magnitude of the energy transition. A second aspect of the invention relates to the use of a non-homogeneous heat distribution which has been found to lead to optical amplification effects.
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Ruschin Shlomo
Stepanov Stanislav
Bolda Eric
Friedman Mark M.
Ramot at Tel Aviv University Ltd.
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