Low crosstalk optical gain medium and method for forming same

Details Low crosstalk optical gain medium and method for forming same Low crosstalk optical gain medium and method for forming same

2005-09-13

2005-09-13

Wilczewski, Mary (Department: 2822)

Coherent light generators

Particular active media

C372S043010, C372S044010, C372S046012, C372S054000

Reexamination Certificate

active

06944197

ABSTRACT:
An optical gain medium, and a method for forming the same, is provided that exhibits lower wavelength crosstalk when configured as an optical amplifier than prior art optical gain media. The optical gain medium of the present invention includes a buried heterostructure waveguide fabricated in a multiple quantum well (MQW) region. The MQW region in which the buried heterostructure waveguide is located exhibits a continuously changing bandgap as a function of position along the waveguide direction, preferably such that the gain provided by the optical gain medium changes exponentially as a function of position along the waveguide direction. In a preferred embodiment, the MQW region in which the buried heterostructure waveguide is buried is grown using a selective-area-growth (SAG) technique, and is made up of at least two quantum wells, with at least one of the quantum wells having a size and composition that vary as a function of position along the waveguide direction.

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