Free-space optical switching apparatus
AssigneeAT&T Bell Laboratories
InventorByung H. Lee
Life of this patent
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Abstract
An optical switching apparatus wherein one or more information-bearing collimated laser beams are each launched into free-space and directed onto a selected photo-receptor to effect an optical cross-connection. Each launched beam is split into two separate components: a payload component, and a monitor component. The payload component of the beam is directed toward a photo-receptor, and the monitor component is directed toward a photo-sensor. The direction in which a particular information-bearing beam is launched is controlled in response to feedback received from the photo-sensor as a function of the position the monitor component associated with that information-bearing beam.
Claims21
An optical switching apparatus comprising:
- means responsive to a control signal for controllably launching a collimated laser beam along a selectable trajectory into a free-space optical path;
- means for obtaining first and second component beams from said launched collimated laser beam, each of said component beams having a trajectory directly related to said trajectory of said launched collimated laser beam;
- a plurality of optical receptors for collecting said first component beam from said free-space optical path;
- and
- control means responsive to a trajectory of said second component beam for generating said control signal, wherein said control signal is applied to means for controllably launching said collimated laser beam so as to direct said first component beam onto a selected one of said plurality of optical receptors.
An optical switching apparatus comprising:
- means responsive to a control signal for controllably launching a collimated laser beam along a selectable trajectory into a free-space optical path;
- a mirror having a partially-reflective surface, said mirror being positioned within said free-space optical path so that said launched collimated laser beam is incident upon said partially-reflective surface, and oriented so as to allow a first component of said launched laser beam to pass through said partially-reflective surface, while causing a second component of said launched laser beam to be reflected off of said partially-reflective surface;
- a plurality of optical receptors adapted for collecting said first component beam from said free-space optical path;
- a photo-sensitive charge-coupled device for sensing the trajectory of said second component beam;
- and
- control means for generating said control signal in response to the trajectory of said second component beam as sensed by said photo-sensitive charge-coupled device, wherein said control signal is applied to said means for controllably launching said collimated laser beam so as to direct said first component beam onto a selected one of said plurality of optical receptors.
An optical switching apparatus comprising:
- means responsive to a control signal for controllably launching a collimated laser beam along a selectable trajectory into a free-space optical path;
- a mirror having a partially-reflective surface, said mirror being positioned within said free-space optical path so that said launched collimated laser beam is incident upon said partially-reflective surface, and oriented so as to allow a first component of said launched laser beam to pass through said partially-reflective surface, while causing a second component of said launched laser beam to be reflected off of said partially-reflective surface;
- a plurality of optical receptors adapted for collecting said first component beam from said free-space optical path;
- a photo-sensitive charge-coupled device for sensing the trajectory of said second component beam, said charge-coupled device being adapted to generate a signal indicative of the intensity and cross-sectional profile of said second component beam;
- and
- control means for generating said control signal in response to the sensed trajectory of said second component beam as sensed by said photo-sensitive means, wherein said control signal is applied to said means for controllably launching said collimated laser beam so as to direct said first component beam onto a selected one of said plurality of receptors.
Dependencies are inferred from the claim text.