Optical waveguides – Accessories – Attenuator
Reexamination Certificate
2005-06-07
2005-06-07
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Accessories
Attenuator
C385S134000
Reexamination Certificate
active
06904223
ABSTRACT:
In a preferred embodiment, a motorized variable optical attenuator comprises an input fiber collimator; an output fiber collimator disposed substantially along the first collimator; and a right-angle reflector movable relative to the input collimator and the output collimator along a translation direction forming a non-zero angle with a direction of a light beam emitted by the input collimator. The reflector comprises two mutually-perpendicular reflective surfaces for sequentially reflecting the light beam emitted by the input collimator to the output collimator. A variable attenuation imparted by the attenuator on the light beam is determined by a position of the reflector relative to the input collimator and the output collimator, along the translation direction. The reflector preferably comprises a right-angle prism adhered to a nut mounted on a threaded axle driven by a stepper motor. The attenuator can achieve stable, ripple-free attenuation characteristics at insertion losses beyond −40 dB.
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Chen Jian J.
Fang Zuyun
Wang Jianhua
Doan Jennifer
Optiworks, Inc.
Popovici Andrei D.
Ullah Akm Enayet
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