Bookham Technology Limited

Steven James Borley

Andrew Cannon Carter

Colin Edge

James Fraser

Lisa Daykin

Stephen Pope

Kevin Mullaney

A control () and a method of controlling a tunable laser having a gain section (), a phase change section () and a segmented Bragg grating reflector section () comprising a series of grating units (-) each of a different pitch, and an electrode (-) associated with each grating so that an electrical current is applicable to each individual grating. The control () includes a plurality of digitally controlled sources () of electrical current which are each connected to switch means (or) operable to independently connect each of said sources () to a respective electrode (e.g.or) associated with a grating (e.g.or) which is one of a subset of consecutive gratings (e.g.&) selected from said series of grating units (-).

Control for a tunable laser

A method and assembly for frequency stabilization of an optical signal especially from a laser, the assembly () comprising beam splitter (), a passive frequency discriminator (), and a pair of photodiodes (&). The beam splitter () in use receives a collimated optical beam (B) and diverts a sample beam (B) which is directed towards the discriminator () which transmits a portion (B) of said sample beam to one of the photodiodes () and reflects a second portion (B) of said sample beam to the other photodiode (). A control signal (S) is derived from the respective intensities of the transmitted and reflected portions of the sample beam, and utilized to operate the electronic control to adjust the frequency of the laser output signal, if required, to maintain a specified frequency.

Frequency locker

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Towcester, United Kingdom

Steven James Borley