Patent Number: 6,310,902

Title: Modulator for analog applications

Abstract: The invention in one aspect is an optical modulator which includes a waveguide region of semiconductor material. In order to achieve a gradual, essentially linear transfer function, the bandgap of the waveguide region is graded along the direction of light propogation or perpendicular thereto. In accordance with another aspect, the invention is an electroabsorption modulated laser where the portion of the waveguide region defining the modulator has a graded bandgap. In accordance with a method aspect, the waveguide region of the modulator is grown using a mask having a varying width to achieve the graded bandgap.

Inventors: Bylsma; Richard Bendicks (Allentown, PA), Ketelsen; Leonard Jan-Peter (Clinton, NJ), Sputz; Sharon Kay (Teaneck, NJ)

Assignee: Agere Systems Optoelectronics Guardian Corp.

International Classification: G02F 1/01 (20060101); G02F 1/025 (20060101); H01S 5/026 (20060101); H01S 5/00 (20060101); G02F 1/015 (20060101); H01S 005/026 ()

Expiration Date: 10/30/2018