ELECTRO-ABSORPTION OPTICAL MODULATOR HAVING MULTIPLE QUANTUM WELL

摘要

An electro-absorption optical modulator having multiple quantum wells is provided to improve linearity of the modulator by forming an absorption layer thereof as the quantum wells which have different width so as to vary characteristics of an electric-optical transfer function. An upper clad layer(41) and a lower clad layer(43) are formed at under and lower parts of an absorption layer(42), respectively. A plurality of electrodes for applying an electric field to the absorption layer. The absorption layer is comprised of two quantum wells which have different width.