Optical attenuator
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United States of America Patent
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Nov 5, 1996
Grant Date -
N/A
app pub date -
Jul 13, 1994
filing date -
Jul 13, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A passive optical attenuating device comprises an optical waveguide adapted to receive optical radiation and absorb, along its length, at least 0.2 dB/m of the optical radiation. The waveguide section may be coupled to a low-loss optical fiber so as to receive an optical signal to be attenuated therefrom. In accordance with one aspect of the invention, at least one region of the waveguide is doped with a transition metal to achieve a pre-selected absorptivity per unit length so that a controlled degree of attenuation can be achieved.
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