| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a semiconductor optical modulator that emits a unimodal laser beam.SOLUTION: An electric field absorption semiconductor optical modulator comprises an n-type InP substrate 2, an n-type InP cladding layer 3, a transparent waveguide layer 4, an n-type InP cladding layer 5, a light absorption layer 6 and a p-type InP cladding layer 7. A light absorption region existing at an end of a light distribution propagating through an optical waveguide provides extinction operation of the light without disturbing a unimodal property of a light distribution 15. Thus, an optical modulator is provided which emits a laser beam 14 whose shape is kept unimodal.</p> |
