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Navy

Fiber optic transceiver with built-in test

A fiber optic transceiver with built-in test (BIT) capability for monitoring optical power and isolating faults in fiber optic cables/harnesses in point-to-point and local area network links. Failures in fiber optic cables are detected and isolated by monitoring signal strength and by optical time domain reflectometry (OTDR). The enabling technology includes a fiber optic transceiver optical subassembly and package configuration.

Photonics

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The Navy’s fiber optic transceiver with built-in test measures laser output and power and finds faults in cables, improving local area network reliability and maintenance.
The Navy’s fiber optic transceiver with built-in test measures laser output and power and finds faults in cables, improving local area network reliability and maintenance.

Photonics packaging research at the Naval Air Warfare Center in Patuxent River, Maryland, is enabling fiber optic  transceiver with built-in test (BIT) capability such that fiber optic transceivers can detect optical faults and power loss, improving the reliability and maintenance of fiber optic local area networks (LANs) used in avionics, data centers, and office building.

Previous methods to find faults in fiber optic cables did not allow vertical cavity surface emitting or edge emitting laser power monitoring in conjunction with in situ optical time domain reflectometry (OTDR) to isolate faults down to the fiber optic transmitter, receiver, and cable plant level.

The following inventions address these issues. An optical bench fiber optic transmitter (US patent 7,853,144), emits a light signal through an angled fiber facet, whereby a portion of the laser signal illuminates the photodetector and a portion illuminates the fibers being monitored. A fiber optic optical subassembly configuration for monitoring fibers (US patent 7,714,991) emits a signal through a beam splitter whereby a portion illuminates the photodetector and a portion is sent down a fiber and reflects from the end of a fiber to transmit light into the fiber being monitored.  And an optical subassembly package configuration with BIT capability for monitoring a single fiber was also invented (US patent 8,023,784).

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$3,000
$4,000
$5,000
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2%
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4%
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$2,000
$3,000
$4,000
Sublicensing Passthrough Royalty
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50%
Patent Maintenance Fee
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Reimbursable to Lab
Reimbursable to Lab

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