Nortel Networks Corporation

Northern Telecom Limited

Stephen John Clements

Sureshchandra Mishrilal Ojha

Richard D Clayton

Sebastian John Savory

A method of wavelength conversion includes receiving a modulated optical signal of a first wavelength and using the modulated optical signal to optically pump an active medium to generate and transmit a like modulated optical signal of a second wavelength, all of which is affected entirely within an optical domain without electrical contacts. Also, an optical wavelength converter includes an active medium that is optically pumped by a modulated optical signal of a first wavelength and transmits the modulated optical signal at a second wavelength. The active medium may be contained in a detachable, external module for wavelength conversion of a fixed wavelength source.

Method and apparatus for optical wavelength conversion

The use of regularly repeated small sections of pattern in making a complete optical grating may generate unwanted effects, such as side lobes, as a result of the regular repetition of defects in the small sections. Methods are described for disrupting the regularity of the occurrence of such defects in a grating made of a plurality of sections, thereby minimizing the likelihood of the occurrence of unwanted side lobes, for example.

Reducing scanning errors

A process for plasma etching a compound semiconductor heterostructure, e.g. to fabricate a ridge laser on a wavelength demultiplexer comprises anisotropic etching of the semiconductor by exposure to a plasma incorporating methane, hydrogen and oxygen. The oxygen content of the plasma is derived from a gaseous precursor such as carbon dioxide or nitrous oxide.

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Stansted, United Kingdom

Stephen John Clements