Optical waveguides – Accessories – Attenuator
Reexamination Certificate
2006-05-23
2006-05-23
Doan, Jennifer (Department: 2874)
Optical waveguides
Accessories
Attenuator
C385S134000
Reexamination Certificate
active
07050694
ABSTRACT:
Method and apparatus of attenuating an optical signal without adding extra components is presented. The drive current of the optical signal source is set to meet a predetermined bandwidth requirement and exceed a predetermined amplitude requirement. An optical isolator that is used to prevent back-reflections from reaching the optical signal source is used to achieve the desired amount of attenuation. More specifically, the invention includes controlling the attenuation by tuning an angle θ between the transmission axis of a polarizer that is part of the optical isolator and the original polarization state of the optical signal. By increasing the angle θ, the amount of attenuation is increased; by decreasing the angle θ, the amount of attenuation is decreased. The invention allows continuous tuning of the angle θ.
REFERENCES:
patent: 5076675 (1991-12-01), Kusaka et al.
patent: 5204868 (1993-04-01), Konno et al.
patent: 5978535 (1999-11-01), Mitsuda et al.
patent: 6297901 (2001-10-01), Kim
patent: 6384957 (2002-05-01), Ikeda et al.
Gustavson Todd L.
Haritos Konstantinos G.
Nagarajan Subra
Sundaram Ramesh
Doan Jennifer
Finisar Corporation
Workman Nydegger
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