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US 6,787,745 B2Granted
Fiber optic signal detector with two switchable input channels
AssigneeAvanex Corporation
InventorsRoger A. Hajjar, Frank Whitehead
Life of this patent
Estimating the term…
Abstract
Switchable two-fiber systems to provide a backup fiber link to a signal detector where the backup signal is switched to the signal detector when the primary signal fails.
Claims20
A device, comprising:
- a first fiber to carry a first optical beam;
- a second fiber to carry a second optical beam;
- a reflector positioned to receive both said first and said second optical beams and rotatable to change reflected directions of said first and said second optical beams;
- a rotational actuator engaged to said reflector to control a rotational position of said reflector in response to a control signal;
- an optical detector positioned relative to said reflector to receive said first optical beam reflected from said reflector at a first rotational position and to receive said second optical beam reflected from said reflector at a second rotational position;
- a focusing lens positioned between said reflector and said optical detector to focus said first and said second optical beams;
- and
- a control module to produce said control signal in response to an input to switch said rotational actuator from said first rotational position to said second rotational position when said input indicates that said optical detector fails to receive said first optical beam from said first fiber.
5 more elements
A device, comprising:
- a first fiber to carry a first optical beam;
- a second fiber positioned parallel to said first fiber to carry a second optical beam;
- an optical detector;
- a reflector oriented about 45 degrees with respect to said fibers and movably positioned at a first position to reflect said first optical beam into said optical detector while not receiving said second optical beam and at a second, different position to reflect said second optical beam into said optical detector while not receiving said first optical beam;
- an actuator engaged to said reflector to move said reflector between said first and said second positions in response to a control signal;
- and
- a control module to produce said control signal in response to an input to control said actuator to move said reflector from said first position to said second position along a direction perpendicular to said fibers when said input indicates that said optical detector fails to receive said first optical beam from said first fiber.
4 more elements
A device, comprising:
- a first fiber to carry a first optical beam;
- a second fiber to carry a second optical beam;
- a reflector positioned to receive both said first and said second optical beams and rotatable to change reflected directions of said first and said second optical beams;
- an optical detector positioned relative to said reflector to receive said first optical beam reflected from said reflector at a first rotational position of said reflector and to receive said second optical beam reflected from said reflector at a second rotational position of said reflector;
- a rotational actuator engaged to said reflector to control a rotational position of said reflector in response to a control signal;
- an optical monitoring mechanism to optically measure said rotational position of said reflector and to produce a monitor signal indicative of a measured rotational position;
- and
- a control module to produce said control signal in response to an input to switch said rotational actuator from said first rotational position to said second rotational position when said input indicates that said optical director fails to receive said first optical beam from said first fiber, said control module further coupled to receive said monitor signal form said optical monitoring mechanism to adjust said control signal for correcting a deviation of said reflector from a desired rotational position according to said monitor signal.
5 more elements
Dependencies are inferred from the claim text.