Variable optical attenuator
AssigneeHon Hai Precision Ind. Co., Ltd.
InventorChih Chiang Chang
Life of this patent
Estimating the term…
Abstract
A variable optical attenuator includes a base (12), an attenuating means (11), a first collimator (13) retaining an input fiber (18), a second collimator (14) retaining an output fiber (20) and an optical baffle (116). The attenuating means has four anamorphic prisms (111,112,113,114). The optical baffle is driven to move into light path of the first collimator and is expanded by two anamorphic prisms to block a part of the light beam. Thereafter, the retaining part of the light path passes through other two anamorphic prisms and shrinks to form a parallel light beam received by the second collimator.
Claims15
A variable optical attenuator comprising:
- a first collimator retaining an input fiber;
- a second collimator retaining an output fiber;
- and
- an attenuating means having two anamorphic prisms for respectively expanding and shrinking parallel light beam and an optical baffle positioned between the two anamorphic prisms;
- wherein, the parallel light beam from the first collimator passes through one anamorphic prism, then expands to form an expanding light beam, the optical baffle is moveable to block part of the expanding light beam, and another part of the expanding light beam is shrunk by the other anamorphic prism, then is received by the second collimator and outputs from the output fiber.
A variable optical attenuator comprising:
- a first collimator;
- a second collimator;
- a first anamorphic prism, a second anamorphic prism, a third anamorphic prism and a forth anamorphic prism orderly positioning in parallel light beam from first collimator;
- and
- an optical baffle for blocking part of the light beam;
- where in parallel light beams coming from the first collimator pass through the first and the second anamorphic prisms, then expand to form an expanded light beams, the optical baffle is moveable to block a part of the expanded light beams, the remaining part of the expanded light beams are shrunk by the third and forth anamorphic prisms, then are received by the second collimator.
A variable optical attenuator comprising:
- a first collimator retaining an input fiber;
- a second collimator retaining an output fiber;
- and
- an attenuating means having an expanding device for expanding parallel light beam from the first collimator and an optical baffle for blocking part of the light beam;
- wherein, parallel light beam from the first collimator passes through the expanding device, then expands to form an expanding light beam, the optical baffle is adjustably moveable to block part of the expanded light beam, and thus another part of the expanded light beam is adapted to be received by the second collimator and outputs from the output fiber.
Dependencies are inferred from the claim text.