The Boeing Company

Hughes Electronics Corporation

Alan R Kost

Daniel Yap

Robert R Hayes

George C Valley

Kenneth Robert Elliott

Thomas R Cooper

A low voltage optical phase modulator includes a splitter having an input, a first output, and a second output. The input receives an optical signal and is split between the first and second outputs. A phase adjustment element is coupled to the second output and produces a predetermined optical shift in the optical signal to produce a phase-shifted optical signal. A first electroabsorptive element is coupled to the first output and blocks transmission of the optical signal when the first electroabsorptive element is activated with a low voltage. A second electroabsorptive element is coupled to the phase adjustment element and blocks transmission of the phase-shifted optical signal when the second electroabsorptive element is activated using the low voltage. An optical combiner having a first combiner input, a second combiner input, and a combiner output is coupled to the first and second electroabsorptive elements and receives the optical signal and the phase-shifted optical signal. The combiner combines these optical signals to produce a binary encoded optical signal. The present invention thus achieves an improved low voltage optical phase modulator. The present invention is advantageous in that substantially larger than 180 degrees phase shift can be achieved with the same low voltage by using optical paths having longer lengths.

Low voltage, optical phase modulator

An integrated optical transmitter includes a modulator drive circuit in communication with a modulator, and a laser drive circuit in communication with a laser. The modulator receives laser light from the laser and modulation control signals from the modulator drive circuit, and outputs modulated optical signals in a direction normal to the substrate surface. The transmitter is integrated by securing the laser to the modulator using flip chip technology. The laser includes a vertical cavity, and is optically aligned with the horizontal coupling surface of the modulator during the flip chip process.

Integrated optical transmitter

Growing community of inventors

Tucson, AZ, United States of America

Alan R Kost