Injection laser assembly incorporating a monitor photosensor
AssigneeNorthern Telecom Limited
InventorsPaul Mark Harrison, Robert George Peall, Terry Victor Clapp
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Abstract
An injection laser assembly mounted upon a crystal substrate [10] employing a back facet monitor is disclosed. A graded index lens [34] focuses light from the, typically, high in diversion and low intensity rays output from the back facet of the laser [30]. To allow repeatable and efficient coupling the graded index lens [34] is mounted within a groove defined in the crystal. Several configurations for mounting a photodiode sensor [P1,P2] are possible.
Claims7
An injection laser assembly comprising a single crystal substrate upon which an injection laser is mounted, characterised in that the substrate is provided with an etched groove, a graded index lens having an axis, said lens being fixedly located in the etched groove by bump stop techniques wherein radiation from the laser back facet is directed towards the lens, off the axis of the lens, whereby emissions from the back facet are directed at a sensor mounted on the substrate.
Dependencies are inferred from the claim text.