The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2006
Filed:
Nov. 29, 2002
Robert Griffin, Northants, GB;
Robert Graham Walker, Northampton, GB;
Robert Ian Johnstone, Northants, GB;
Robert Griffin, Northants, GB;
Robert Graham Walker, Northampton, GB;
Robert Ian Johnstone, Northants, GB;
Bookham Technology, PLC, Northamptonshire, GB;
Abstract
A photonic integrated device having a substrate layer, epitaxial layers formed on said substrate layer and a guiding layer formed by one of the epitaxial layers. An optical waveguide is formed within the guiding layer. In the waveguide are a splitter () having at least two outputs, each output being transmitted to a Mach-Zehnder modulator (), the phase of the output of at least one modulator being shiftable, the signals being recombined to provide an optical phase shift key (PSK) output () wherein a trench is etched into the substrate layer between each pair of modulators to isolate the modulators from one another.