Patent ID: 8841143

Claim:
A method of manufacturing an optical modulator having a laser diode section generating light at a lasing wavelength and an electroabsorption modulator section for modulating the light generated by the laser diode section, comprising: forming a laser diode (LD) growth layer on a semiconductor substrate, the LD growth layer being a semiconductor layer for manufacturing the laser diode section; forming an electroabsorption layer on the semiconductor substrate, the electroabsorption layer being for forming the electroabsorption modulator section; measuring photoluminescent wavelength of the electroabsorption layer and comparing the photoluminscent wavelength measured to a design photoluminscent wavelength; if the photoluminscent wavelength measured is different from the design photoluminscent wavelength, calculating an adjusted width of a stripe structure of the optical modulator, as compared to a design width of the stripe structure of the optical modulator so that a difference between (i) a design lasing wavelength of the light generated by the laser diode section and the photoluminscent wavelength measured, becomes smaller with respect to a design value, wherein the design value is a difference between (ii) a design photoluminscent wavelength of the electroabsorption modulator section and the design lasing wavelength of the laser diode section; and etching at least the LD growth layer to form a stripe structure in at least the laser diode section having a width equal to the adjusted width.