Sensitized erbium fiber optical amplifier and source

  • US 5,225,925 A
  • Filed: 07/24/1991
  • Issued: 07/06/1993
  • Est. Priority Date: 01/23/1991
  • Status: Expired due to Term
First Claim
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1. A silicic optical fiber for use in optical amplifiers and sources, comprising:

  • a concentration of erbium ions for providing radiation when the quantum energy level of said erbium ions decays from 4 I13/2 metastable state to the 4 I15/2 ground level state;

    a concentration of ytterbium ions for absorbing radiation as the quantum energy level of said ytterbium ions is excited from a thermally excited sub-level of the 2 F7/2 state to the 2 F5/2 metastable state and for exciting the quantum energy level of said erbium ions from the 4 I15/2 ground level state to the 4 I11/2 state when the quantum energy level of said ytterbium ions decays from the 2 F5/2 state back to the 2 F7/2 state; and

    a concentration of phosphate for reducing the decay time of the erbium ion quantum energy level from the 4 I11/2 state to the 4 I13/2 state to reduce back transfer of energy from said erbium ions to said ytterbium ions.

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