Coherent light generators – Optical fiber laser
Patent
1997-07-23
1998-10-27
Lee, John D.
Coherent light generators
Optical fiber laser
359158, 359341, 372 18, 372 25, 372 26, H01S 307
Patent
active
058286799
ABSTRACT:
A non-linear semiconductor optical device includes an active waveguide with a multiple quantum well construction in the active region. The device is supplied with a drive current at the material transparency current with respect to an optical pump. An optical non-linearity appears with respect to input radiation having a wavelength below that of the bandgap equivalent wavelength of the active region (.lambda.<.lambda.g), the effect being achieved at relatively low optical input powers. The non-linearity is fast enough that a switching device incorporating the invention, in use as a demultiplexer, has potential to be used at bit rates approaching the Tbit/s range. In a demultiplexer embodiment, the non-linearity may be exploited in a directional coupler, an optical pump being used intermittently to control cross-over of an incoming TDM data signal so as to "pick off" a selected channel. Other applications include optical logic devices.
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British Telecommunications public limited company
Lee John D.
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